Wind -cooling screw heat pump unit installation operation and maintenance manual

Before repairing or operating crew: pay attention:

Note: In order to prevent electrical shocks from accidents, when the power supply is connected, the power supply is carefully controlled, adjusted, or other operation and maintenance. Under normal circumstances, all the power switches are placed in the “disconnection” position and locked.

Warning: Before maintenance, disconnect all power switches, including remote switches, otherwise, serious personal injury or death will occur.

Note: First of all, it is necessary to determine the correct phase sequence. Before the unit starts, it must be checked, otherwise the compressor may be severely damaged.

Note: Do not use unprocessed or inappropriate water, otherwise it may cause device damage.

Note: Before the crew runs, a proper shell tube heat exchanger must be established.

Unit logo:

Units nameplate

: Cold -cooling screw heat pump crew typical unit nameplate as shown in Figure:

The unit nameplate is located on the side column next to the control box. The information provided by the unit nameplate is: unit model, unit performance parameters, use of power supply, refrigerant specifications/quantity, frozen oil specifications/quantity, unit size/quality.

Compressor nameplate

: The compressor nameplate is attached to the compressor. The information provided by the compressor nameplate is: compressor model, compressor exhaust volume, compressor start -up current, and maximum operating current of the compressor.

Pressure container nameplate

: Pressure container nameplate is attached to the container. The information provided by the pressure vessel nameplate is: container number, design pressure, test pressure, design temperature, and heat exchange area.

Important tips: Pressure containers are special equipment. Before use, users must go to local relevant institutions according to the pressure container quality certificate provided by the manufacturer before use.


Unit check:

When the unit arrives, carefully confirm whether the unit is consistent with the order and assembled it correctly.

Check whether all external components are visible damage. If there is any obvious damage or material shortage, please notify the transporter and make a “unit damage” on the shipping party’s transportation collection. And type, and notify manufacturers to sell or maintenance personnel.

Before obtained the permission of sales or maintenance personnel, do not set up a damaged unit.


Check item:

In order to avoid damage to the crew during transportation, please complete the inspection items accepted by the crew:

1. Before receiving the unit, check whether the unit and packaging material are obviously damaged.

2. After the device is delivered, check whether the unit is inherently damaged as much as possible. Internal damage must be reported to manufacturers to the manufacturer’s sales or maintenance personnel within the time stipulated by the manufacturers.

3. If you find internal damage, stop the box. Do not remove the damaged materials from the receiving location. If you may take a photo or video of the damaged object. The recipient must provide credible evidence to prove that damage is not caused after delivery.

4. Inform manufacturers to sell or repair personnel for repair. However, before the dealer representative inspecting the damage part, do not repair it.

The design and manufacturing standards of the crew follow the GB/T18430.1. Before the factory, each unit is fully assembled and leaked by the pipeline and circuit. Each unit is filled with an appropriate amount test.

The responsibility that the installer needs to understand:

During the installation process of the equipment, the installer should bear the following responsibilities:

1. Confirmation of random accessories. Such as: shock absorbers, temperature sensors, random data, and other installation accessories ordered by factories. These accessories are necessary during installation. For units installed and installed on the unit by the startup cabinet, random accessories are placed on the unit, and random accessories are placed in the random accessories on the unit. The random accessories are placed in the random accessories. In the startup cabinet, the random accessories are placed in a random accessories box for the units of remote installation with the startup cabinet.

2. The foundation of equipment installation must ensure that the concentrated weight of the entire unit must be carried.

3. Put the shock -absorbing pad components provided or installed by the manufacturer or installed by themselves on the bottom of the unit (if it is installed on a non -bottom floor, it is recommended to use a spring shock absorber).

4. Installation according to the manufacturer’s corresponding installation manual. Southern society

5. Complete the connection work of all water pipelines and circuits.

Note: There must be corresponding support in the water pipe connection at the on -site water pipe to avoid pressure from the equipment. Therefore, it is strongly recommended that the auxiliary of the water pipe and the unit maintains at least 1m distance. This is to consider the installation of the equipment on the site and the necessary pipeline adjustment.

6. The position specified in the upstream and downstream pipes of the inlet and out of the shell tube heat exchanger needs to be installed with valve. These valves can be used to cut off the connection between the heat exchanger and the external water pipeline during maintenance, and at the same time, it plays a balance and system adjustment.

7. The flow switch is needed to install the flow switch or similar device (except the configuration of the unit) on the water pipeline of the shell pipe exchanger, and the corresponding water pump boot cabinet locks with them to ensure that the unit starts to run when normal water flow. Essence

8. Install a threaded interface at the entrance and exit of the water pipeline near the shell pipe, to prepare the installation thermometer and pressure meter.

9. Install sewage or drainage pipeline for each shell tube heat exchanger.

10. Provide and install filters in all water pumps and automatic adjustment valves.

11. Provide and install the pressure -leoling safety pipeline. When the pressure is too high, the pressure can be discharged through the safety valve.

Unit storage:

If the unit should be saved for a period of time before installation, please take the following preventive measures to prevent equipment damage:


1. Put the cold water crew in a place where ventilation, dryness, anti -vibration, and solid foundation. If the unit has been insulated in the factory, please avoid directly illuminating the crew of the sun. Any protective coverage on the unit.

2. The unit’s high and low pressure pressure must be checked once a month to confirm that the pressure of the refrigeration system has not become smaller. If there is a refrigerant leak, please contact the manufacturer’s salesperson or maintenance staff to deal with it reasonably.

3. The water side of the cold water units does not need special attention, but there may be debris in the water pipe. Therefore, it is necessary to check and clean the water pipe before the crew is put in operation.


4. If the crew will be stored for more than a year, it should be calculated from the first day of the preserved, and the unit should be performed once a year to observe whether there is a leakage. This work also needs to be completed by qualified maintenance personnel.


5. When installation of the unit, please install it in accordance with the instruction manual sent with the crew together. Any work in the first start of the new unit must be carried out under the guidance of qualified maintenance personnel.

Note: In order to avoid damaging the insulation and thermal insulation installed by the factory, please avoid the sun exposure!

Units handling and hanging:

Note: Do not use a fork -to -moving device. Using a fork -to -moving device may cause the unit to damage.

1. Before the unit handling, confirm the equipment and tools suitable for the installation of the installation site, and to withstand the weight of the crew and all attachments. Hemantong South Society

2. The bottom of all units is equipped with a suspension ring. You can use a base lifting ring to be lifted. When hanging, you must pay attention not to hurt the equipment. There should be a protective pad for the tangel contact area.

3. Confirm that the unit transports to the installation position is enough to allow the unit and packaging to pass safely.

Pay attention when hanging:

The crew should be hung carefully to hang the uniform speed to prevent the unit from trembling.


Check and ensure that the hook is tightly tightened by the unit. The operator should not stand under the unit. The unit tilt angle is less than 20 °, do not shake and collide over too much.

It is recommended to use the lifting device of the figure below to move the cold water units.

Suggestion: Start the beam.

In order to avoid the damage of the crew of the hanging process, the suspension beam is recommended to add a hanging beam at the top of the unit, and it does not contact the crew that it cannot use the lifting device on the spot. It is recommended to use a steel pipe under the unit base to promote or drag cold water units.

Installation requirements:

Unit installation location requirements:

Running environment: In order to ensure that the electrical components can work normally, do not install the air -cooled and cold water heat pump units on places where dust, large dirt, too much corrosive smoke, oil fume, steam or other heat sources.


1. The cold and cold hot and cold water units must be installed outdoors or other good ventilation places.

2. When the host is placed against the wall, there must be enough ventilation space.

a) When the side of the unit is installed on the wall, the side of the unit’s side should be greater than 500mm. As shown below:

b) When the front or back of the unit is against the wall, if the wall height is less than 800mm higher than the ground floor, the wall should be greater than 1200mm. As shown below.

c) When the front or behind the wall is installed, if the wall height is more than 800mm higher than that of the unit, the wall should be greater than 2000mm. As shown below:

When two or more hosts are discharged, the distance between each other must be greater than 2 meters. Each of each of the two hosts should be equipped with a heat -stringing partition in the figure below to prevent the wind from falling into the wind:


Rain -proof snow: To prevent excessive rain and snow from entering the crew, the sunshade snowpers can be used inside the unit.

Noise processing: The unit should be installed in a sensitive area away from the sound. If the noise of the unit exceeds the noise indicator of the installation location, it is recommended to install the sound insulation equipment.

Note: The crew cannot be installed in the basement or indoor place. In special cases, please consult the technicians of the air -conditioning manufacturer in advance in the above position.

Installation basic requirements:


The installation of wind and cold water units requires a hard, flat installation machine or concrete base. It is necessary During running refrigerant, oil and water).

When the user selects the unit installation position, you should consider whether the architectural architecture can bear the weight of the unit. If necessary, the design of the load -bearing structure should be added. In addition, it should carefully handle the operation of the operation of the crew, and take positive seismic measures to protect the house’s structure. Damaged.

In order to avoid the twisted and fractures generated by the long -term operation of the earthquake, typhoon, or equipment, proper fixed measures should be taken between the base and the installation plane, the unit and the base.

Drainage: In order to facilitate drainage, the drainage ditch should be set around the foundation and ensure smooth drainage.

Note: In the process of installation and processing on the construction site, any equipment is damaged, please immediately notify the manufacturer’s sales staff or maintenance personnel.

Warning: The poor design of the load -bearing structure or the unreasonable design of the installation foundation may lead to the damage of the unit and the damage of the personnel. The foundation of the unit is recommended as shown below. For the specific installation size, see the technical specifications in the installation and maintenance manual of each manufacturer.


1) The foundation must ensure sufficient strength. It can be made with reinforced concrete or made of steel;

2) Basic plane horizontal deviation is not greater than 0.1%;

3) Configure the shock absorber according to the operating weight of the unit.

Division reduction: In order to reduce the sound and vibration of the foundation through the installation of the foundation, and to ensure the reasonable distribution of the unit’s weight on the installation surface, the vibration reduction pad (rubber) or spring shock absorber is installed at the bottom of the unit.

Vibration reduction pad: When everything is ready to prepare the final unit resettlement, the vibration pad should be placed at all the feet of the unit.

The schematic diagram of the vibration reduction pad is shown below:

Spring shock absorber: When the unit is not installed on the bottom floor, it is necessary to consider using a spring shock absorber.


Spring shock absorber installation diagram:

Note: When the pipelines of the unit have been laid, and the water and refrigerant have been filled, the shock absorber is adjusted.

1. Place the shock absorber on the base of the cold and cold water units to ensure that each shock absorber is in the corresponding installation hole pair.

2. When the shock absorber is placed on a non -horizontal plane, in order to ensure the horizontal installation of the unit, it is necessary to use thin pads or cement to fill the installation height. Make sure that the filling and the surface of the shock absorber base must be in contact with the surface of the shock absorber, and there should be no gap.


3. Fix the shock absorbers on the basis of installation.

Water pipe road installation:

A water circulation road must be installed on the air -cooled and cold water heat pump unit. The design and installation of the water circulation pipeline system is very important. It must be performed by professionals. Any unreasonable pipeline design and installation method will affect the function of the unit function and even cause serious damage.

1. Pipeline design method can be designed with the same -proof pipeline or different -program pipeline.

2. The air -cooled and cold water heat pump unit should adopt a closed water circulation system. The basic closed water circulation system should include water pumps, deeper valves, one -way valve, expansion water tank, unit and air conditioning ending equipment. The expansion water tank should be installed at the water back of the unit. The water surface should be higher than the highest point of the water system at least 1 meter. The export of the expansion water tank shall not be installed to prevent the water pipe from leaking or bursting. Southern society

3. The inlet and outlet pipes of the crew are posted and exited in and out of water. The connection pipes should be connected according to the logo.

4. The water pipeline system should select the pump with a suitable flow and the appropriate raising to ensure that the actual water supply of the unit is not more than 10%.

5. The connection between the unit tube heat exchanger of the unit shall be installed with a soft connector.


6. Install thermometer and pressure tone on the unit tube heat exchanger of the unit.

7. The drainage pipe connector should be arranged at all the low points of the pipeline in order to run the water in the pipeline when necessary; arrange the air deflation joint at all highs to discharge the air in the pipeline.

8. External water pipes and accessories should be fixed and supported by reasonable support to prevent the gravity from being subject to the water pipe joint of the unit to avoid damage to the equipment.

9. The insulation of pipelines is very important, and construction should be strictly in accordance with national regulations. The “cold damage” (or “heat loss”) caused by insufficient thickness of the insulation layer or unreasonable seams exceeds the specified value, which will directly affect the performance of the host function and may lead to condensation phenomenon. Cause adverse effects and damage.

10. The outdoor part of the pipeline system should be protected to prevent the damage to prevent rain and cause.

Note: When installing the pipeline on site, pay attention to the arrangement of pipelines and set up pipeline support to avoid the unit tolerance. To this end, the strong recommendation of the pipeline installation dealers should ensure that the minimum distance between the pipeline and the unit must not be less than 1m, so as to ensure that the installation site leaves appropriate space for the unit, so that the pipeline can be connected to any need to adjust.

Typical take -off schematic diagram of the water pipe road is as shown below:

Note: It is strongly recommended that the pipeline installation dealers should ensure that the minimum distance between the pipeline and the unit shall not be less than 1m, so as to ensure that the installation site leaves appropriate installation space to the unit, so that the pipeline is connected to any need to adjust.

Note: In order to ensure the cleanliness of the water pipeline of the shell tube -type heat exchanger, it should be checked before running the pump but starting the cold water unit. If there is a local blocking existence, it should be detected and cleared to avoid damage to the pipelines caused by the frozen and corrosion of the shell tube heat exchanger.

Tip: When the NPT (US -standard cone tube threaded thread, tooth angle is 60 °) is connected, appropriate sealing or polytetrafluoroethylene raw materials should be added to prevent water leakage. At the same time, the heat preservation treatment should be dealt with.

Pressure gauge: The pressure gauge should be installed in the straight pipe section of the pipeline. The installation point should be at least one distance from the downstream bending tube and holes.


1. The exhaust valve and drain valve provided on the water pipe should be installed on the site. The exhaust valve should be used to discharge the air in the pipeline. The drain valve is used for drainage during stop or maintenance.

2 The cut -off valve should be installed on the import and export water pipe for future maintenance and maintenance.

When installing on the spot, determine whether the exhaust valve is required. It must be noted that when the fluid temperature rises, the intercept valve will produce potential dangerous high pressure in the container.

Water filter: Install a filter in the imported side of the water shuffle, control valve, pump and other major equipment in the water pipe circuit, so as to avoid impurities from entering the above devices and cause damage to the equipment.

Note: The pipeline uses a filter!

The filter must be installed on the water pipeline of each shell tube -type heat exchanger in the unit, otherwise it will cause the pipeline to block and damage the unit components. Hemantong South Society

Water treatment: The use of unprocessed or improper treatment of water in the air -cooled and cold water units can cause reduced operation efficiency or even damage to the pipeline. Therefore, if necessary, please qualify water treatment personnel for water treatment. Please inquire the latest specifications: GB/T50050-2017 “Design Specifications for Industrial Cooling Water Treatment” requirements.

Note: The use of unprocessed or improperly treated water in the unit will cause scaling, corrosion, rust, algae, or viscosity. If the above situation occurs, the qualified water treatment personnel should be requested to decide the appropriate water treatment method. General equipment manufacturers do not include the corrosion, rust and wear of the equipment in the after -sales warranty.

Flow detection device: Use the flow switch or the pressure difference switch to the PLC controller to confirm whether the water flow of the shell tube heat exchanger is established.


In order to protect the air -cooled water units, please connect the water flow switch and water pump contacts with the PLC controller to reach the lock. For specific electrical wiring, please refer to the random circuit diagram.

Unless it is specifically stated, the water flow switch has been installed before the crew out of the factory, and the installation location indicates the following figure:

For the unit’s unoperable water flow switch, installation is required on the spot. Be sure to follow the manufacturer’s suggestion selection and installation equipment. At the same time, according to the following general installation guide:

Install traffic switch:

1. Dual modules and above, its water flow switch must be installed on the water outlet.

2. The flow switch should be installed vertically on the horizontal pipe section, and the horizontal tube section on both sides of the switch should be at least 3 times the length of the pipe diameter length.

3. In order to ensure that the flow switch works under the design conditions, the length of the switching blades is adjusted to compensate the height of the T -type connector of the T -shaped connecting of the traffic switch.

4. Make sure that the flow direction of the flow switch is the same as the actual water flow direction in the water pipe road.

5. Eliminate the air in the pipeline to avoid the flow switch “tremor”.

6. Regulate the water flow switch so that the water flow is lower than the normal value, the water flow switch is cut off.

Water flow switch protection:

The establishment of the water flow of the shell tube -type heat exchanger must be confirmed by the water flow switch. If the water flow switch or the switch fails is not installed, it will cause severe damage to the unit!

The traffic switch with a logical control can ensure that the water flow has been established before the crew starts, and the unit is turned off at the same time when the flow stops.

If the water flow circulation is needed, and the water flow switch is not closed, the system fault diagnosis will generate a visual alarm information.


Dual module and above combination crew heat exchangers of the water outlet temperature rod installation:

The temperature sensor of the shell tube heat exchanger plays an important role in the normal operation of the unit. The unit’s refrigeration volume is regulated by the temperature sensing of the water outlet of the shell tube -type heat exchanger to meet the customer’s supply back temperature requirements. There are two sets of in -exit water pipes in the dual -spelling dual module and above models. It is necessary to connect it and then connect into the waterway. At the same time, the water temperature sensor is installed on the water chief pipe.

1. Side water pipe type:

As shown in the figure below, the unit has installed the pipelines of the side water in the factory in accordance with the customer’s requirements, and the temperature sensor is installed at the outlet. There is no need to install the temperature stick at the construction site.

2. After the water pipe type

The entry and exit water pipes are installed on -site by the installation dealer or user. Please strictly require the construction of the welding process. After the inlet and out of the water pipe are installed on the spot, the welding should be chanted as shown below. At the same time, the tape is sealed. Essence After the manufacturer’s after -sales maintenance personnel installed the input and exit water pipes of the shell -type heat exchanger in the installer or customer, and welded with the warm warm rod seat, or before the debugging of the first boot, the temperature of the warm rod was installed and wiring.

Installation of refrigerant emissions:

In order to prevent damage caused by inhalation of refrigerant, do not discharge the refrigerant everywhere.

All crews are equipped with a refrigerant discharge valve (safety valve), and the emission pipes of all emission valves are responsible for the installer.

General suggestions:

The discharge pipe of the safety valve is directly discharged outdoors, and the discharge pipe can only be compatible with the refrigerant used. If the pipeline joint has been prepared in advance, and the adhesive used is compatible with refrigerants, a polychloride (PVC) tube can also be used [cannot be used to use a cpvc tube].

The air -cooled and cold water heat pump units are generally installed with safety valves. The picture below shows the appearance diagram and installation location of the safety valve.

If the pressure of the refrigerant in the storage device exceeds the opening pressure of the safety valve, the safety valve will be opened. As the refrigerant overflows from the safety valve, the pressure in the unit system will be reduced.

When installing the safety valve emissions pipeline, we must follow local standards and regulations.


The general suggestions for installing the safety valve emissions pipeline are as follows:

1. When installing the connection pipe, you must use two wrenches to hold the safety valve body and fix it. A stuck connecting tube rotates and locks.

2. A live connection must be installed on the connection tube, which facilitates the safety valve to disassemble the annual correction.

Safety valve leakage:

If the torque of the tight thread is loaded on the external pipeline without fixed the safety valve body, it will cause the thread to loosen the thread of the lower part of the safety valve!

Safety valve correction:

The safety valve must be corrected once a year, otherwise it will cause system security accidents due to the set pressure deviation of the setting pressure of the safety valve!

Electrical control:

The start -up control cabinet installed on the unit is generally standard configuration of air -cooled and cold water heat pump unit.

Selecting the start -up control cabinet installed on the unit can greatly reduce the workload of on -site wiring. However, the installer also needs to complete the edge of the following three electrical lines:

1. Connect the power cord with the start -up control cabinet;

2. The wiring of other control options;

3. Control equipment provided by other on -site.

Dangerous voltage!

Break off all power sources including distant circuit breakers before the unit run. According to the correct segmentation/closing steps, ensure that the power is not turned on inadvertently, and the power supply does not cut off the power before running the unit will cause casualties.

When powering, debugging, or other related work, it should be very cautious. Inadvertently may cause serious casualties.

All on -site installation wiring must be strictly in accordance with national electrical specifications and national and regional specifications where the user is located.

Starting control cabinets: All control elements and motor startup devices are wiring and functional testing. The start -up control cabinet includes the control of multiple compressors and the power part of the related fan control and the control of the PCO module.

The power part includes the Star Truck of each compressor to start control and related fan start -stop control.

The control section includes I/O modules and display control. Please.

In order to prevent damage to the launch cabinet parts, please remove the debris in the startup cabinet. Otherwise, it will cause short circuits and cause damage to the kitchen cabinet parts.

Connection of the power cord:


All power power supply lines must have qualified project engineers selected according to national electrical standards.

After the power supply line is passed through the pipe, the air switch terminal is connected to the air switching terminal through the lower part of the startup cabinet.

The wire cannot be contacted with other components, structural components or units. All wires must have sufficient length to move the compressor and unit.

Note: It can only be used by copper, otherwise it will cause corrosion or overheating, causing the crew damage.

Note: In order to avoid controlling failures, do not put more than 30V wires with low voltage (<30V) wires in a wire pipe.


Circuit broken circuit breaker and fuse: Select the appropriate circuit breaker or fuse in accordance with national electrical specifications or local specifications.

Start the control cabinet into the line:

Start the control cabinet into the electrical installation of the wires as shown in the figure:

1. The power supply of the unit adopts a three -phase and five -line system. In order to ensure safety, the neutral and ground lines must be connected separately.

2. Installed or users must configure the circuit breaker at the front end of the power supply of the control cabinet.

3. Install or user’s configuration lines need to be used for copper core wires, and its specifications and wire diameters must meet the corresponding electrical specifications.

4. The electrical parameters of the unit can be obtained from the samples and random information of the product equipment, and the specifically shall be subject to the contract regulations on both parties.


Please remove the debris in the startup cabinet. Otherwise, it will cause short circuits and cause damage to the startup component!

Start cabinet electrical specifications:

Rated voltage: 380VAC;

Rated frequency: 50/60Hz;

Working range: ± 10%of the rated voltage; the imbalance of the phase voltage is not more than 5%.

Each compressor is equipped with a startup cabinet, and each startup cabinet requires a set of independent power to enter the cable.


Control cabinet power supply

The following is the specification requirements in the control cabinet:


Rated voltage: 220VAC 50Hz

Work scope: 198 ~ 242VAC

Water pump mutual lock circuit: The auxiliary connection of the water pump contactor in the shell tube -type heat exchanger shall receive a PLC chain contact. The wire is 1.5mm2 copper wires. The water pump contactor can pass the signal feedback.

Start the component installed inside the control cabinet: Start the meta component installed inside the control cabinet in the circuit diagram in the subsequent circuit diagram and list in order in order. The installation of the components in the control cabinet is as follows:

Each brand is different, for reference only.

Running principle:

Overview of the air -cooled screw -type cold water thermal pump unit: It is a central air -conditioning unit with air as cooling medium (summer) and heat source (winter), water -loading agent, and steam compressed refrigeration cycle. The unit has the characteristics of cooling and cold. It can form a concentrated or semi -episodes of a centralized central air -conditioning system with fan coils, air -conditioning boxes, and air processors. It has the characteristics of flexible layout and diverse control methods.

Appearance diagram

Basic components:


Use semi -closed screw compressor

Adjustment method: Slide valve adjustment, which can easily adjust the output capacity of the compressor by loading and uninstalling valves.

Regulate scope: 15 ~ 100%.

Electric starting method: Star/triangular startup method, automatically low load start, reduce the start current.

Wing tablet heat exchanger:


Form: copper tube+aluminum wings,

Hot copper pipe: Internal threaded bronze pipes, increase the heat exchange area, and improve heat exchange efficiency.

Heading tablets: ripple type, water -proofing aluminum tablets for orchid treatment. Effectively reduce the thickness of the condensed water film during heating and runtime, and improve the heat exchange efficiency of the tray tube.

Shell tube heat exchanger:

1. The unit uses a shell tube heat exchanger, where the tube runs the refrigerant, and the shell is cold (hot) water;

2. The design pressure of the refrigerant side is 24kgf/cm2 (test pressure is 27.6 kgf/cm2);

3. The pressure on the water side design work pressure is 10 kgf/cm2 (test pressure is 11.2 kgf/cm2).

Electronic expansion valve:


Electronic expansion valve control is composed of electronic expansion valve body, pressure sensor, temperature sensor, and controller.

When working, the pressure sensor will pass the evaporator outlet pressure P1, the temperature sensor will pass the compressor’s inhalation of excessive heat to the controller. To the need. To maintain the amount of liquid supply required by evaporator. The stepper motor of the electronic expansion valve is based on the changes in the export pressure of the evaporator and the inhalation of the compressor. The spring force of the valve change makes the opening degree of the valve meet the demand for the amount of liquid supply of the evaporator, and then the amount of liquid supply of the evaporator can match the evaporate load in real time, that is, the electronic expansion valve can be set by controlling the instrument to effectively control the controller as a settings to effectively control the controller and effectively control it. Excessive heat.

Refrigeration cycle:

During the crew cooling operation, the compressor inhaled the low -pressure refrigerant gas in the inhaled gas liquid separator.

All the remaining liquid refrigerants are throwing through another throwing plate. After the medium -pressure liquid refrigerant is thrown through the flow, the decompression becomes a low -pressure liquid refrigerant, and the evaporator is evenly entered. The small holes of the device are sprayed (that is, the entire length of the shell), and evenly distribute to each evaporator tube. The liquid refrigerant fully absorbs heat and gasification from the circulating water in the evaporator. Here, the refrigerant liquid absorbs calories from the hot copper pipe, while the water in the copper pipe is cooled, and the water pump after cooling can be delivered to the need for use. After the heat -absorbing gasification, the low pressure gas came out of the evaporator and returned to the compressor. So far, complete a refrigeration cycle.

After the four -pass directional valve to the wing tablet heat exchanger, the air circulation is used to take away the heat through the fan in the wing tablet, and the cooling is a high -pressure liquid, and then the unidirectional valve, the high pressure storage device, the liquid of the liquid After the bottom of the liquid storage device passes through the dry filter, remove water and impurities, flow to the electronic expansion valve. After the high -pressure liquid is swollen by the expansion valve, the decompression expansion becomes a low -pressure refrigerant gas liquid mixture, and the shell tube type is evenly entered into the shell tube type Heater, here, the refrigerant gas liquid mixture absorbs heat in the hot copper pipe, while the water outside the copper pipe is cooled. The cooling water after the cooling pump is sent to the place of use through the water pump to meet the requirements of the use. The low -pressure gas comes out of the shell tube heat exchanger, after the four -way is changed to the gas liquid separator, the gas liquid separator flows to the compressor inhale, and the fluid that returns to the compressor is an overheated gas. At this point, a refrigeration cycle is completed.

Heating cycle:

During the unit heating operation, the low -pressure refrigerant gas in the compressor inhalation of the popular fluid separator is discharged from the high -pressure gas after the compressor is supercharged. In the heatware, the water outside the copper pipe is heated in high temperature and high -voltage cold -suppressed refrigerant gas in the copper pipe. The heat water pump through the water pump and send it to the need for use. Cooling is a high -pressure liquid. High -pressure liquids pass through unidirectional valves, flowing people high -pressure storage device, and liquids from the bottom of the storage device to remove water and impurities, flow to electronic expansion valves. After that, the decompression expansion becomes a low -pressure refrigerant gas liquid mixture, which is evenly entered into the wing tablet heat exchanger. Cycle, provide heat sources. After vaporization of low -voltage gas from the wing tablet heat exchanger, after the four -pass directional valve to the gas liquid separator, the gas liquid separator flows to the compressor inhale, and it is guaranteed to return to the compressor to return to the compressor The fluids are all gas, and a heating cycle is completed.





Compression machine lubrication system:

When the compressor is running, the oil in the fuel tank is under the exhaust pressure, and the oil continues to flow to the low pressure zone. After the oil flows out of the tank, the oil cooler is diverted to the compressor loading valve into the oil port and high and low voltage bearing. Inlet oil port, enter the frozen oil in the plus unloading piston and bearing, return to the low -pressure side of the compressor, and finally discharge after compressing the compressor rotor, and return to the fuel tank through the oil separator.

Warning: The surface temperature may exceed 65.5 ° C; please be careful when operating in some areas of the unit. If you accidentally operate, you may cause personal casualties.

In order to ensure normal lubrication and prevent the refrigerant from being condensed in the fuel tank, a 200W heater is placed in the fuel tank to heat the oil when the unit is shut down. When the unit starts, the power supply of the oil heater is cut off. When the unit is not running, the heater is powered on, so that the temperature of the oil is kept at 40 to 60 ° C.

Electric cooling system:


The use of the liquid spray system is to prevent the compressor from being overheated. From the system liquid pipe, the pipe enters the compressor preset liquid spray port. Install the solenoid valve and the expansion valve in this pipe. When the exhaust temperature is too high, the solenoid valve is opened. The liquid refrigeration flow through the expansion valve, enter the compressor after throwing, and vaporization of the heat of the motor to ensure the safe and stable operation of the compressor.

Cold and warm system flowchart

Single -cold system flowchart

Unit protection and control:

Current overload protection: over -protection is used to avoid the motor current overload damage to the compressed motor during operation. The current of the compressed motor is monitored and controlled by a restricted function to prevent the case of over current and cause damage to the compressed motor.

The current limit control logic is limited to the current limit setting value by limiting the current of the compressor (generally set to 1.2 times the rated value, and this value can be adjusted).

Protection of lack of phase: Lack of phase protection can protect the refrigerator from being damaged due to lack of phase. If any of the three phase currents of the motor is gone, this control will stop the cold water unit. A fault alarm information will appear on the touch screen when stopping.

The current overload protection will also protect the motor under the condition of only single -phase. Protection of lack of phase is another protection, which can produce a more accurate alarm information that describes the fault.

Reverse protection: This function prevent the compressor from reversing. After the incorrect power phase is detected, a fault alarm information will be generated.

The temperature of the water is too low protection:

The water outlet temperature is too low. The stop setting is set by the manufacturer and can be modified by controlling the software.

The setting value of the water output temperature stop protection standard unit is 4 ° C, and the water output temperature is lower than 4 ° C.

Refrigerator low -temperature stop protection:

Low -temperature stop protection of shell tube refrigerant is used to prevent water from freezing in the heat exchanger. When the heat exchanger refrigerator is set to 4 ° C, the alarm stops, and a fault alarm information will appear.

The low -temperature stop setting value of the standard unit refrigerant is 4 ° C. This value can be modified by maintenance tools.


Excessive exhaust temperature is too high protection:

Excessive exhaust temperature protection is a safety control method used to prevent the condensation temperature from being excessive and cause the unit system to be damaged. It can be modified by maintenance tools. The exhaust temperature is too high to stop the setting value of 95 ° C. When the exhaust temperature is higher than 95 ° C, the duration of more than 3 seconds (the delay time can be modified by the control software). Essence

Restart delay:

This function can provide frequent launching protection of the motor. The execution of the restart delay function depends on the set value. The default value is 10 minutes. After the unit is shut down, it will start again. The interval will not start at less than 10 minutes. This setting can be modified in the control software.

High -pressure protection:

High -pressure shutdown protection is a security control method that is damaged without the pressure of the unit system. The shutdown setting is set by the manufacturer and can be modified by the maintenance tool.

Setting value of high -pressure shutdown protection standard crew: R22 refrigerant is 25kgf/cm2; when the high pressure pressure of the unit system exceeds the set value, the police will report to the police, and the display of a fault alarm information will have low pressure protection.

Low -voltage shutdown protection is a security control method that is not destroyed by the unit system of the unit without the pressure of the unit system. The shutdown setting is set by the manufacturer and can be modified by the maintenance tool. Low -voltage stop protection standard unit setting value: R22 refrigerant is 5.0kgf/cm2; the pressure difference is 1.0kgf/cm2. When the low pressure pressure of the unit system is lower than the 4.0 police report, the touch screen will appear a fault alarm information.

Oil level protection:

Oil -level shutdown protection is a safety control method that protects the compressor without being damaged by oil loss. The shutdown setting is set by the manufacturer and can be modified by the maintenance tool.


The setting value of the oil level shutdown protection delay is 100 seconds. When the oil level in the fuel tank is lower than the oil level switch control point, the duration of more than 100 seconds (the delay time can be modified by the control software) Alarm information.

Operation interface:

Slightly (please operate according to the requirements of different brand product manuals).

The crew started:

The crew was turned on for the first time to debug:

Conditions for boot debugging:

1. Putting and commissioning is usually undertaken by professional engineers of air -conditioning manufacturers. To avoid responsibility.

2. Confirm that the device has been installed and finished.

3. Confirm that the water pipe road has been installed and passed through the pressure test

4. Confirm that the power supply has been connected.

Preparation before power -on commissioning:

After the unit is installed, the following operation procedures must be followed before the power -on debugging:

1. Check the installation engineering, such as ventilation conditions, installation foundations, shock absorbers and power supply, etc., confirm that it meets the requirements

2. Check whether the unit is damaged to ensure that it meets the boot requirements.

1) Whether the refrigerant pressure is normal and whether the system has leaked.

2) Check whether the wing tablet heat exchanger is intact and clean? If there are more dust, wash it first.

3) All parts inside the unit are complete and fixed.

3. Check all the wiring of the unit to ensure that it is correct and firmly connected.

1) The unit is well grounded;

2) The insulation of electrical equipment such as compressors complies with the requirements (requirements: 500VDC, 20MΩ).

Note: Check whether the power supply line of the compressor is firmly connected (including circuit breaker, contactor, compressor wiring box terminal, etc.). Too loose wiring may cause insufficient heat at the wiring and the voltage of the compressed machine.

4. Check whether the power supply line of the unit is equipped with a circuit breaker. The power supply supply of the unit is correct, and the voltage fluctuation value cannot exceed 2%.

5. System debugging of the water pipeline system, this work is completed by the water system engineering installation and contractor, and the maintenance personnel are referenced.

1) Set the open and closing state of all valves according to the design requirements.

2) Open the exhaust valve and add water from the expansion water tank or other hydrating equipment until full overflow. During this time, the manual exhaust valve should be turned off one by one (from low to high).

Note: Do not use unprocessed or improperly treated water, otherwise the unit will be damaged.

3) Close the water pump circuit breaker, power the pump to the unit, run the pump separately, and check the steering of the pump. If reverse, the power supply phase sequence should be replaced; determine the sound of the water pump operation and the current.

4) After starting the water pump, the refrigerant water begins to circulate, check whether all pipelines leak, water filter is blocked, and repair or clean up if necessary.

5)打开排气阀(如为自动排气阀则不必手动打开),排除水管路系统内部的残留空气(需要排气的各局部高点的空气是否都已经排净?对于庞大的水系统, Each supporting management should be carefully checked to determine that each manual exhaust valve is eliminated with continuous and stable water flow, and the automatic exhaust valve no longer has air discharge).

6) Observe the stability of the pressure difference and water pressure in the water pump. If the pressure difference is too large, check whether the pipe valve is opened, and whether the water filter is blocked by impurities. If the water pressure is unstable, the air should be continued until the water pressure is stable.

7) When the circulation of the refrigerant water pipeline system, adjust the water flow and check whether the water pressure drop of the shell tube heat exchanger is consistent with the order requirements.

8) The crew of the built -in water pump, or the start and stop of the pump is controlled by the host, the operating interface should be explained in accordance with the “Operation Interface” separately.

Unit power: Measure the power supply voltage of each foot on the air switch of the main circuit of the unit. If the power supply voltage of a certain foot is no longer specified, the power supply party should be notified to be corrected, and it cannot be turned on before that.



Insufficient voltage will cause errors in the control component and shorten the life of the compressed motor and contactor.

Unbalanced voltage of the unit:

Excessive voltage imbalance can cause the motor to overheat and eventually burn. The allowable maximum voltage imbalance is 5%. The calculation method is as follows: the imbalance rate (%) = (vx-vave) × 100/ vave

VAVE = (V1+V2+V3)/3

VX = the most different phase voltage from VAVE.

Unit boot program:

If the preparations before the startup have been completed, the crew can start the debugging by the following steps:

1. Oil heating

1) Check the electrical line again. After the confirmation is intact, close the air switch, connect the power supply, and place the switch on the host operating board on the manual position.

2) Adjust the setting values ​​in the monitor control menu as needed.

3) After the computer controller is powered on, the unit automatically enters the oil heating time. It takes at least 4 hours in summer and at least 8 hours in winter.

Note: After the oil heating time meets the requirements, the unit can start to avoid damage to the compressor caused by liquid refrigerant during booting.

2 boot boot

1) Open the compressor high and low pressure valve, high -pressure liquid tube valve, oil circuit valve and water pipe road valve on each circuit.

2) Check whether the high and low pressure pressure is normal again.

3) Correctly set the condition of warm and warm.

4) Close the air switch of the refrigerant water pump, power the pump, and start the refrigerant water circulation before the refrigerant road, oil pipe road, and water pipe road valve are not opened. Do not run the unit to avoid damage to the compressor.

5) According to the button in the “Operation Interface”, the starting unit will be turned on. The unit will be turned on. The compressor will be loaded and uninstalled according to the changes in the temperature of the cold water.

3. Observe the operating status of the host

1) After the crew is started, pay attention to whether the operation direction of the screw compressor and the direction of the cooling fan are correct. (A reversing protector has been set inside the host)

2) Pay attention to whether its operating status is good. If there is an abnormality, it should be stopped immediately.

3) Carefully observe whether the current of the compression machine is within the normal range and whether the phase current is balanced.

4) Disclosure if the failure is protected, check it carefully, find out the cause, and re -turn it on after the failure.


4. The start of the ending equipment, pay attention to the temperature of the water system, the temperature of the cold water is below 20 ° C during the cold, and the temperature of the hot water can start the end equipment to 30 ° C.

Note: When the temperature of the frozen water comes out of the setting value, the controller issues a uninstallation instruction and adjust the compressor unloading valve. If the water temperature continues to decrease, the controller issues a shutdown instruction.

5. Adjust the water system flow

1) If the water pipeline system is equipped with a flow meter, it can adjust the regulating valve of the water system according to the actual construction drawing and design flow distribution.

2) If there is no installation of the traffic meter, the temperature difference between the import and export water temperature of the ends of each branch can be equal to the design value, that is, the temperature difference between the water temperature difference between the unit import and export is equal to the design value, and repeatedly analyzes and adjusts.

6. Parameter measurement and system adjustment

The unit runs for more than 30 minutes, and after reaching a stable state, the measurement records of the running parameters are performed, and the system is normal based on the measurement data analysis and judging system, and then adjust the system.

1) Measure the temperature and pressure of each point of the refrigerant system, and compare the temperature and pressure displayed by the display.

2) Measure the voltage and current of the unit.


3) Measuring the over -cooling and over heat of the system.

Note: If the operating pressure is low and the over -cooling degree is low, you can judge insufficient refrigerants, and you should use a gaseous refrigerant to charge the relevant circuit. In the case of the crew, the refrigerant is added until the normal operation is connected by connecting to the pipe road and the absorbing pipe maintenance valve.

Note: Only the refrigerant specified on the unit nameplate can be used to avoid damage to the compressor and ensure that the system operates.

If the operating state shows excessive refrigeration injection, some refrigerants should be recycled from the liquid pipeline, and the speed should be slow when recycling, minimizing the oil loss, and the refrigerant is strictly prohibited to directly discharge the refrigerant to the atmosphere.

Warning: Avoid direct contact with the skin and the skin, otherwise frostbite may occur.

System excessive heat: Under full load, the normal over heat of each circuit is about 4-5 ° C. When the unit load is reduced, the over heat may fluctuate at the set point.

System over -cooling: The normal overlapping degree of each circuit is about 3-6 ° C. If the over -cooling of a cycle does not match the above values, the system should be checked.

Daily boot of the unit:

1. Confirm that the unit has no alarm

2. Start the pump

3. Press the “Start” button on the display controller for more than 3 seconds

4. After 10 minutes of startup, start the end

1. For the start of the unit, please refer to the method of the key description in the “Operation Interface”.

2. The operation and maintenance of the crew shall be specified for execution.

3. After the power outages, the unit controller will automatically re -computer oil to heal time.

4. You can set the automatic start and stop by time.

5. Avoid frequent start and stop.

1. For the first start or stopping the power out of power for more than 24 hours, the oil heating device of the fuel tank before booting must be heated for 4 to 8 hours.

2. Re -boot after the summer, winter or long period of stop. Do not start the end load of each end. In the summer, the water temperature is lower than 20 ° C or the water temperature in winter is higher than 30 ° C before starting the end load.


3. When the temperature of the cold water units reaches the set value, the controller issues uninstall instructions to adjust the compressor uninstallation valve. If the water temperature continues to fall or rise, the controller issues a stop instruction.

Seasonal boot:


1. Turn off all the drain valves and reinstall the water stuff in the shell tube heat exchanger.

2. Check the spare equipment based on the starting and maintenance instructions provided by each equipment manufacturer.

3. Set the opening and closing status of all valves according to the design requirements.

4. Re -injection of the water pipe circuit system and the air in the air pipeline system. After the empty is completed, turn off the manual exhaust valve one by one (from low to high).

5. Check whether the unit is damaged to ensure that it meets the boot requirements.

1) Whether the refrigerant pressure is normal and whether the system has leaked.

2) Check whether the wing tablet heat exchanger is intact and clean? If there are more dust, wash it first.



3) All parts inside the unit are complete and fixed.

6. Check all the wiring of the unit to ensure that it is correct and firmly connected.

1) The unit is well grounded.

2) The insulation of electrical equipment such as compressors meet the requirements (requirements: 500VDC, 20MΩ)


Check whether the power supply line of the compressor is firmly connected (including circuit breakers, contactors, compressor wiring box terminals, etc.). Too loose wiring may cause insufficient heat at the wiring and the pressure of the compressed machine.


7. Confirm that the refrigerant tube road, oil road and compressor exhaust and aspiration valve have been opened.

8. Close all cutting switches to power the compressor oil heater.

Note: The engine oil heater before booting the unit must be heated for 4 to 8 hours continuously to avoid damage to the compressor during the booting.

9. Close the water pump circuit breaker to power the unit pump starting cabinet.


10. Start the water pump to start circulating, and check whether there is leakage of the pipeline, and repair if necessary.

11. According to the explanation of the daily boot part of the unit.

Pay attention after the crew starts or runs:

1. Observe whether the unit current is normal after booting.

2. Whether each compressor motor runs normally.

3. Whether the machine is running for a special sound and abnormal sound.

4. Whether the circulating water pump water is good and whether the water pressure is normal.

5. Whether the unit pressure gauge index is normal.

6. Check whether the frozen oil of the compressor oil window is normal.

7. When the high and low voltage switch or the high and low voltage difference switch is eliminated, the reason should be found and after repairing.

8. 5E controller should pay attention to high or low voltage.

The problem of lift:

When the following phenomenon is found, it should be stopped immediately to cut off the power supply and check and repair.

1. When the protection switches cannot cut off the power.


2. There is an abnormal impact of the compressor.

3. When the power supply voltage exceeds 10%of the rated voltage and the current of the compressed machine exceeds 15%.

4. The pressure set by the high -voltage meter and the low -voltage meter index exceeds the high and low pressure automatic switch without automatic stop.

5. Machine starting difficulties or cannot be started.

When the part is rotating: the measurement, adjustment or maintenance work when power is powered on. If the operation is not careful, it will cause casualties.

The unit shuts down:

The unit shutdown program:

Daily shutdown:

1. Press the “stop” button on the display controller for more than 3 seconds.

2. After the compressor stops for 3 minutes, stop the pump.

3. Close the end load.

Daily shutdown flowchart

Seasonal crew off:

After completing the daily shutdown steps, continue to complete the following procedures:

1. Disgle the interruption switch of the pump to lock the switch in the disconnect position.

2. Turn off all the water pipeline valve and eliminate the water in the shell tube heat exchanger.

3. Disgle the unit’s main intermittent road switch and lock it in the disconnected position.

4. Check the pressure of the crew of the crew at least 3 months to determine that the refrigerant has not leaked.

6. When the crew is not used in winter, the maintenance steps described in some “annual maintenance” in this manual must be operated by professional maintenance personnel.

General failure analysis and treatment:

Unit maintenance:

Regular maintenance: This part will introduce the basic maintenance methods of the unit and recommend the maintenance cycle of maintenance to users. It is very important to maintain regular maintenance of cold water units. It is related to whether the unit can run with the best performance and efficiency.

Important: The unit must be responsible for booting, shutting down, maintenance and maintenance.

Record form: A very important content in the maintenance of the unit is to complete the regular record. When the operator accurately records various data, the operator can change the changes in the operating status of the unit, which can predict and prevent the crew from failing to occur.

For example, if the operator finds the increasing trend of condensate pressure within a month, the cold water unit needs to be systematically inspected to find out the possible cause of this situation (such as heat exchanger scaling, etc.)

Daily maintenance and maintenance:

1. Record the high and low voltage pressure of the cold and cold water units, the temperature of the inlet and out of water, the air inlet temperature, and the running current and voltage of the unit, and compare the read values ​​with the normal operation parameters of the unit.

2. The unit’s appearance is clean

Important: strongly recommend daily record logs for cold water units.

Maintenance every week:


1. Complete all daily maintenance and inspection work, and complete the log

2. Check whether the entire unit is abnormal, check whether the wing tablet heat exchanger is dirty. If it is dirty, clean should be cleaned.

3. Measted the over -cooling and over heat of the system, and recorded it.

Maintenance: monthly maintenance:

1. Complete all weekly maintenance work. See the previous part for details.

2. Check whether the screws of each device are loose.

3. Check whether the electrical lines are well exposed and whether there is fever and aging.

4. Check whether the control switch, protection switch and computer setting value have changed.

5. Check whether the pipeline joints have leakage.

6. Check whether the pressure of the refrigerant system is normal. (Check the unit when running)

7. Check whether the expansion water tank and water tower supply water are normal.

Maintenance every quarter:

1. Complete all monthly maintenance work. See the previous part for details.

2. All filters of cleaning the water pipe system

3. Check the pressure or temperature of the excessive import and export of the dryer (such as the pressure difference between 0.6kgf/cm2 or above the two sides or the temperature difference exceeds 2 ° C, which means that there is a blockage, and the drying device core and cleaning the filter should be replaced).

4. Check whether the oil surface of the compressor oil is normal, and whether the frozen oil is changed to change the frozen oil depending on the situation.

Maintenance every six months:

1. Complete all quarter maintenance work. See the previous part for details.

2. Check the dirt of cleaning the fins (the viewer group depends on the high pressure pressure when the operating conditions are running).

Maintenance of the stop season:


1. In the spring and autumn seasons or when you encounter a long vacation, when the cold water crew does not need to start, the host power should be cut off; when the winter is not used in winter, the water in the unit water system should be completely discharged to prevent low temperature in winter (0 (0 Below ° C) Water freeze to damage the equipment.

2. Clean the compressor oil filter and dry -dryer filter (depending on the monthly maintenance situation).


Annual maintenance:

1. Complete the weekly, monthly, and season maintenance procedures.

2. Please check the setting value of each control after the qualification after -sales maintenance engineer, check the condition of the compressor and contactor, and replace it in time if you need it.

3. Check whether all the pipelines are leaked or damaged, and any debris that hinder water flow in the water pipe should be cleaned in time.

4. Clean up the corrosive part and reinserate it.

5. Clean the wing -type heat exchanger.

6. Check the cleanliness of frozen oil or oil product analysis of the compressor, and change the frozen oil depending on the situation

7. Use 0 ° C ice water to confirm whether the temperature sensor is correct. If the number of temperature reading and the standard value error exceeds 0.5 ° C, the sensor must be replaced.

Cleaning of Wing Tablet heat exchanger:

Clean up at least once a year, the heat shifting device. If the environment is dirty, it should be cleaned. In order to ensure the support efficiency of the unit when running. When cleaning, we should follow the guidance of the cleaner manufacturer to avoid damage to the wing tablet heat exchanger.

1. Soft brush or jets should be used when cleaning the wing -type heat exchanger.

2. If the pH value of the cleaning agent exceeds 8.5, preservatives should be added.

Maintenance of the electronic control box:

1. The humidity of the surrounding environment of the electronic control box should not be greater than 90%. Pay attention to dust protection.

2. It is strictly forbidden to oil liquid or corrosive liquid splash on the surface of the touch screen.

3. It is strictly forbidden to disassemble the lines and electrical components, otherwise the consequences will be at their own risk.

4. Other debris are strictly prohibited in the electronic control box.

5. At least once a year of dust removal and electrical line inspection of the electronic control box.

Maintenance of oil circuit:

Replacement of compressor lubricating oil:

In order to ensure the normal operation of the unit compressor, users are advised to formulate an annual oil -quality analysis plan to determine the refrigeration oil replacement cycle. Only when the oil analysis results prove that the oil is replaced when it needs to be replaced.

Oil -quality analysis can reduce the total fuel consumption and refrigerant leakage in the operating life of the unit. Only professional laboratories that are familiar with refrigerant and oil, and professional laboratories that have maintenance experience with screw -type cold water units can analyze oil quality.

Oil analysis can provide very valuable information on the operating performance of the unit, which can reduce maintenance costs and improve the operation of the unit. During the oil quality analysis, an oil -sample can be collected on the corner valve of the oil road.

If the oil -free analysis conditions are recommended, it is recommended that users determine the freezing oil replacement cycle according to the running time. After the first boot runs for 1500 hours, replace the freezing oil, and change the frozen oil again after running for 10,000 hours. The

1. The user decides whether to replace the frozen oil and change the cost of the frozen oil.

2. The frozen oil plate number used by the screw -type wind and cold water units and the amount full of one need to be added can be referenced.

Oil filter cleaning:

It is recommended to clean the oil filter after 72 hours of running for the first time. After 500 hours of running, clean the oil filter. After 3,000 hours (or 6 months), it will be washed every 3,000 hours (or 6 months).

In the following circumstances, oil filters must be cleaned: (1) Maintenance of annual maintenance (2) each time the oil is changed;


1. Cleaning cycle users can decide to be extended or shortened according to the actual situation

2. After multiple cleaning, the filter filtering effect decreases significantly or the oil penetration must be replaced when the filter is damaged

Oil filter cleaning or replacement operation steps:

1. Disgle the power of the compressor.

2. Turn off the compressor absorbing and exhaust and cutting valve.

3. Select the corner valve on the cover of the oil filter, and use a wrench to rotate the time clockwise until the angle valve is fully opened.

4. Open the angle valve cap, connect a refrigerant belt, and tighten the refrigerant with bending.

5. Use a wrench to close the corner valve.

6. Remove the refrigerant belt, put the frozen oil in the compressed machine oil box through the refrigerant belt into the recycling barrel

7. Open the oil filter cover with a wrench and replace or clean the filter.

8. Install the filter in the opposite order of the removable oil filter.

9. After the cover of the oil filter is installed, open a little bit of compressor inhalation and turn off the valve (depending on the exhaust of the gas), and the air in the fuel tank.

10. Turn off the compressor’s inhalation of the valve, use oil gun or oil pump, cover the valve on the upper angle of the board through the oil filter, charge the recycling frozen oil, and supplement the appropriate amount of freezing oil as depending on the situation.

11. Remove the refrigerant belt and lock the angle valve cap.

12. Open the compressor’s high, low pressure and exhaust exhaust control valve.

Generally, some maintenance operations on the refrigeration system will expose the operator or maintenance personnel to the liquid or gaseous refrigerant environment. Therefore, the staff is required to strictly operate the refrigerant container in accordance with the material safety operation specifications. Otherwise, casualties will occur due to long -term exposure of inhalation refrigerant or skin.

The filling process of the refrigerant of the screw -type wind and cold water unit is as follows:

1. Use hose or copper tube compatible with refrigerant, and the tube should have a closed joint or cutting valve.


2. Use the following methods to fill the refrigerant:

1) Use the existing pressure difference. Use a hose or copper tube to connect the unit high -pressure reservoir filling interface with the refrigerant cylinder interface to open the two -terminal valve due to pressure difference, and the refrigerant naturally flows into the unit. (This method cannot be filled when the pressure rises to the pressure from the refrigerant cylinder cannot be filled)

2) Use liquid refrigerant recycling and reuse device. The unit filling interface is connected to the device exit of the refrigerant recycling. At the same time, the refrigerant recycling is connected to the interface of the refrigerant steel cylinder interface to open all valves and start the recycling device.

3) Use the unit to run the pressure difference: use a hose or copper tube when the unit runtime, connect the unit’s low -pressure storage liquid machine filling interface with the refrigerant cylinder interface, and after the two -ends are opened due to the pressure difference, the refrigerant is naturally naturally. The refrigerant is naturally natural Flowing into the unit (this method needs to control the speed of filling and irrigation to prevent compressor liquid compression).

3. The refrigerant that requires the filling requires a refrigerant, which is called a refrigerant with the proper weight. Or meter at the number of refrigerant bottle.

According to the actual operation of the crew, contact the professional maintenance agency and decide when the unit is comprehensive to check to check the condition of the compressor and internal components of the unit.

If the user’s unit enjoys the right to extend the warranty, extended the warranty clauses will require users to strictly follow the maintenance content listed in the regular maintenance of this manual, otherwise the warranty will not be extended. The clause will also require the cold water unit to be checked by the maintenance institution authorized by the manufacturer’s authorized each year or 5,000 hours (subject to the first arrival). The inspection includes at least the annual test table, running logs, leakage testing, and also a comprehensive inspection of the cold water unit. Finally, users are required to perform corresponding maintenance in accordance with the inspection, and the cost shall be borne by the user.

Cleaning shell tube heat exchanger:

Because the water system cycle is a typical closed cycle, it is not easy to accumulate a large amount of scale or sludge inside. Usually, cleaning every three years is enough. However, for open systems, regular inspections and cleaning are recommended.

If scaling or sludge is found in daily maintenance, these impurities should be carried out in time. If this method fails to work, the chemical method should be used for cleaning.

Note: A acidic cleaner cannot be used to avoid damage to the steel pipe and internal copper pipes.

The standard chemical cleaning device is as shown below:


Please be careful when chemically cleaning the device! Otherwise it will damage the device.


All chemical substances, solution concentrations, the length of cleaning time, and all safety prevention measures used in the circulatory system need to be recognized by the company’s manufacturer and the company.

Control settings and adjustments

Each year, time delay and safety control high and low pressure protection settings should be checked. When calibrating and inspecting the controller, please contact the professional maintenance institution authorized by the manufacturer.

Single module (single compressor) and module combination circuit diagram:

Circuit diagram, I/O board wiring diagram (slightly)

Main power wiring diagram:

Configuration component wiring diagram (first system):

This article comes from the Internet, which is based on the courseware related to Futian Air Conditioning. Heatongnan Society sorted and edited.


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