MRCOOL 48K BTU 4T GeoCool 4T Multi Positional 230V 1 Phase 60Hz DC Invert User Manual

48K BTU 4T GeoCool 4T Multi Positional 230V 1 Phase 60Hz DC Invert
User Manual

48K BTU 4T GeoCool 4T Multi Positional 230V 1 Phase 60Hz DC Invert

SERVICE MANUAL
Version Date: 09/15/23
Capacity: 48kBtu/h 60kBtu/h
Rate Frequency: 60Hz
Operating Range:
Cooling: 44.6°F (7°C) ~107.6°F (42°C)
Heating: 21.2°F (-6°C) ~89.6°F (32°C)
Foreword
Thank you for choosing this product. In order to correctly install and use our units, and for the satisfactory operation effect, please read this manual carefully.
This manual specifies safe operation requirements from perspectives of product introduction, control, troubleshooting and maintenance, as well as basic principles and implementation methods. Professional  operators must abide by relevant national (local) safety requirements and technical specifications set forth in this manual during operations; otherwise, the product system may fail or be damaged, and personnel safety accident may also occur.
Safety Notice

| Before using this product, please first read the instruction manual.
---|---
| Before installing this product, please first read the instruction manual.
****| Before repairing this product, please first read the technical service manual.

Safety Notice on Maintenance

PROHIBITED：

1. Do not pierce or burn.
2. Please note that refrigerant may be odorless.
3. The appliance shall be stored in a room without continuously operating ignition sources (For example: open flames, an operating gas appliance or an operating electric heater).
4. The installation method is the same with the common joints. However, because the joint can’t be detached, if it is badly connected and causes leakage, it needs to be cut and replaced by a new one through welding.
5. Using unsuitable parts or tools may lead to electric shock or fire hazard.
6. If refrigerant leaks during maintenance, please ventilate the room immediately. Heavy leakage may lead to breathing difficulty, severe injury or death.
7. Disconnect power before disassembling the appliance for maintenance.
8.  The appliance should be maintained and cared by authorized technical personnel with necessary qualifications.

WARNING:

1. If the working place is more than 6.5 ft (2m’s) high, please wear a safety helmet, gloves and a safety belt.
2. Never mix any other substances except the specified refrigerant into the refrigerant circuit.
3.  When re-locating the appliance, check whether the new location is strong enough to withstand the weight of the appliance.
4. If there is refrigerant leak, please fix the leak before charging in the refrigerant. After refrigerant is charged, check for refrigerant leaks. If you cannot spot the leak, stop the maintenance work. Please evacuate the system and close the service valve to prevent refrigerant leaking into the room.
5.  Prepare suitable tools and protectors.
6. If you need to carry out maintenance or check the electric circuit without cutting off the power, please be careful not to touch the electrical parts.

NOTICE:

1. If the appliance is maintained at a humid place, it should be grounded to avoid electric shock.
2.  Never repair the unit with wet hands. Operating the unit with wet hands may lead to electric shock.
3. If the unit is not correctly grounded, please check and fix it.
4. Before cleaning the unit, please disconnect power to prevent the inner fan from starting up and running at high speed; Otherwise personal injury may occur.
5.  Measure the insulation resistance after maintenance. The resistance must be 3 ft (1M or higher. Bad insulation may lead to electric shock.
6.  Welding and cutting work must be done in a well-ventilated place.
7.  Gas appliances, heaters and other fire sources should be kept away from the installation and maintenance site.
8. Maintenance should be done according to suggestions of the manufacturer.
9.  Maintenance should be done only after the refrigerant is completely reclaimed from the unit.

OBSERVED：

1. After the maintenance work is done, check the drainage of A-Coil Module.
2.  Do not tilt the unit, otherwise, water may spill out from the unit and make the floor and furniture wet.
3. Disassembly of the unit, handling of the refrigerant, oil and accessories should all be done according to applicable local rules and regulations.

Safety Notice on Operation
PROHIBITED:

1. Never try to modify the unit, otherwise, it may cause electric shock, overheat or fire hazard.
2. If the power cord or conducting wires are scratched, please replace them.
3. Never use connected or extended power cord or share the power socket with other appliances.
4. Prepare a specialized power circuit for the appliance.

WARNING:

1. If the power plug is dirty, please clean it before inserting it to the power socket. If the power plug is loose, please tight it up.
2. Do not damage the power cord. A damaged or refitted power cord may lead to electric shock or fire hazard.
3.  Check frequently whether the appliance is in good condition.

NOTICE:

1. Do not use organic solvents to wipe the controller operating panel.
2. Before cleaning the unit, cut off the power supply.

Product Introduction

1.1 Lists of Units
1.1.1 List of Compressor Module

Model| Power Supply| Cooling/Heating Capacity (Btu/h)| Finished Product Code| Appearance
---|---|---|---|---
V/Ph/Hz
GCSHPM060IN| 208/230V-1Ph-60Hz| 62000/55000| ES80100010|

**![MRCOOL 48K BTU 4T GeoCool 4T Multi Positional 230V 1 Phase 60Hz DC Invert

• icon 1](https://manuals.plus/wp-content/uploads/2023/12/MRCOOL-48K-BTU-4T- GeoCool-4T-Multi-Positional-230V-1-Phase-60Hz-DC-Invert-icon-1.png)**

GCSHPM048IN| **** 50500/48000| **** ES80100020

1.1.2 List of A-Coil Module

Model| Power Supply| Cooling/Heating Capacity (Btu/h)| Finished Product Code| Appearance
---|---|---|---|---
V/Ph/Hz
GCSCAM060GN| 208/230V-1Ph-60Hz| 62000/55000| ES82000010|

GCSCAM048GN| **** 50500/48000| **** ES82000020

NOTE: 1 Ton =12000Btu/h = 3.517kW
1.1.3 List of Blower Module

Model| Power Supply| Airflow (CFM)| Finished Product Code| Appearance
---|---|---|---|---
V/Ph/Hz
GCSBLM014| 208/230V-1Ph-60Hz| 1400| ES81000010|

GCSBLM013| 1400| **** ES81000020

1.2 Electrical Parameters

GCSCAM048GN
GCSCAM060GN| 208/230V-1Ph-60Hz| 5| **** 15

 Control Mode

2.1 Based Control
2.1.1 Compressor Control
When cooling or heating mode is turned on, the fan of Blower module will run for a while before the compressor starts. Under different modes, the compressor can only be stopped after running for some time (special cases excluded). This is to protect the compressor from frequent start or stop. Once the compressor is stopped, it must not be restarted right away. Please wait for a few minutes.
2.1.2 EEV Control
When the unit is first started, the electronic expansion valve will reset control. During the process, the expansion valve will produce rattling sound. When cooling or heating mode is turned on, the valve will be open at a certain step before the compressor starts.
2.1.3 4-way Valve Control
After heating mode is turned on for a while, 4-way valve will be energized to change the direction of refrigerant flow so that the system can run in heating. Under other modes, the valve will not be energized.
To avoid the 4-way valve from incorrectly changing directions, when the unit stops in heating, due to a temperature point or other protection reasons, the 4-way valve will continue to energized temporarily and lose power after a while.
There must be enough pressure difference between the condensing and evaporation pressure for the 4-way valve before changing directions.
2.2 Special Control
2.2.1 Oil Return Control
If the unit is running at low frequency for a long time, oil return control is needed to let the oil in the pipeline back to the compressor. Generally, this control will take 4~6min. The compressor frequency will be raised.
2.2.1 High-Pressure Protection
If the high pressure switch of the unit is detected to trip at 4.2MPa or if the high pressure temperature measured by high pressure sensor exceeds 149°F (65℃) for a period of time, the mainboard display screen will display error code “E1” and the unit will shut down. High-Pressure Protection can be cleared by manually powering off the unit. The reset pressure of the high pressure switch is 3.6MPa.
2.2.3 Low Pressure Protection Control
There are two low pressure switches for the unit. One is for ground water application designed to trip at 0.25MPa (reset at 0.3MPa), the other is for ground-loop application designed to trip at 0.1Mpa (reset at 0.2MPa). When the low pressure switch is detected to trip for a period of time, the unit will shut down and the mainboard display screen will display error code E3. The unit will restart when the low pressure switch has reset within a few minutes. If low pressure protection occurs for several times in a short time, the unit will not restart automatically. You need to restart the unit manually.
2.2.4 High Discharge Temperature Protection
If the discharge temperature of the unit is detected to be higher than 230°F (110℃) for a period of time, the unit shuts down and displays error code “E4” on the main board display screen. When it is detected that the discharge temperature of the unit is less than the 194°F (90℃) for a period of time, the error will be cleared and the unit will restart. If High Discharge Temperature Protection occurs multiple times within a certain period of time, the error cannot be automatically cleared and need to be cleared manually by powering off the unit.
2.2.5 Anti-Freezing Protection
Under cooling mode, if the temperature of the evaporator (measured by the in- tube temperature sensor) is detected to be lower than the limit value for a continuous period of time, the evaporator is at risk of frosting, the unit will enter Anti-Freezing Protection and shut down. If the temperature of the evaporator is detected to be higher than the relating value for a period of time, the unit will restart. If the anti-freezing protection occurs multiple times during a period of time in the cooling mode, the unit will stop and the error code “E2” will be displayed on the main board display screen and the error need to be cleared by manually powering off the unit.
For ground water application, if the compressor is not operating and the inlet or outlet water temperature of the Compressor module is below 33.8°F (1℃), water valve will open and the water pump will start to circulate the water in the water loop. The error code “E2” will display on the main board display screen. If the water temperature is higher than 41°F (5℃) for a period of time, the anti-freezing protection will be cleared. The water pump will shut down and water valve will close.

Functions

3.1 Dip Switch Setting of Compressor Module
3.1.1 Geothermal Mode Setting
The geothermal application of the unit can be set through the second dip switch SA2 on the mainboard of the Compressor module. The specific definitions of the dip switch are as follows.

Model| Geothermal
Application| Dip switches of Compressor Module
---|---|---
GCSHPM048IN
GCSHPM060IN| Ground Water (Default)|
Ground Loop|

3.2 Dip Switch Setting of A-Coil Module
3.2.1 Fan Speed Setting
Set the fan speed through the dip switch SA1 of the A-Coil Module mainboard and you can change the fan speed by the first dip switch of the SA1. For the automatic adjustment control, the fan speed will change according to the temperature of return air temperature. For fixed speed control, the fan will run at a certain level. The specific definition of the dip switch is as follows.

Model| DIP Switch| Speed Control| Dip switches of A-Coil Module
---|---|---|---
GCSCAM048GN GCSCAM060GN| The first dip switch of the SA1| Automatic Adjustment Control|
Fixed Speed Control|
Model| Dip Switch| Fan Speed| Dip switches of A-Coil Module
---|---|---|---
GCSCAM048GN
GCSCAM060GN| SA1| Level 1|
Level 2|
Level 3″
(Default)|
Level 4|
Level 5|

3.2.2 Supply Air Direction Setting
The supply air direction of the unit need to be set through the second dip switch of SA2 on the mainboard of the A-Coil module according to the installation of the unit. The specific definition of the dip switch is as follows.

GCSCAM048GN
GCSCAM060GN| Vertical Upflow
Horizontal Return Air Default）|
Vertical Downflow|

NOTE:

1. During installation and debugging, pay attention to check whether the thermostat has set the fan delay and shutdown time. The actual delay and shutdown time of the fan depends on the setting of the thermostat.

3.3 Refrigerant Recovery
This function is part of the debugging function. It is only used for the situation that the unit would be removed to another place and the refrigerant need to be recovered to the unit from the pipelines. When the unit is shut down, the debugging function can be enabled by the operation of SW1-3.

1. Press and hold “SW1” for about 5 seconds to enter the first level menu of debug menu.
2. Under the first level menu, press and hold “SW1” for about 5 seconds to switch to the number “08”.
3. Press and hold “SW2” or “SW3” for about 5 seconds to enter the control mode. “ON” means on, and “OF” means off.
4. Press and hold “SW1” for about 5 seconds to save.

Notes: When operating by pressing SW1~3, please maintain the button operation until the display screen changes. During debugging function, if no operation is performed within 10s, the debug menu interface will exit.
3.4 Water Pump Start-up Function
This function is part of the debugging function. It is used for evacuating the air from the water pipeline for the installation or maintenance of the water system. The water pump start-up function needs to be operated when the unit is powered on, and must be operated by a professional. The water or antifreeze solution need to be added at the same time.
When the unit is shut down, the debugging function can be enabled by the operation of SW1-3.

1. Press and hold “SW1” for about 5 seconds to enter the first-level menu of the debugging mode.
2.  In the first-level menu, press and hold “SW1” for about 5 seconds to switch to the number “03”.
3. Press and hold “SW2” or “SW3” for about 5 seconds to enter the control mode, “ON” means open, “OF” means off.
4.  Press and hold “SW1” for about 5 seconds to save.

Notes: When operating by pressing SW1~3, please keep pressing the keys until the display changes.
In this mode, the Water Flow Switch Protection is set to be reserved.
If no air discharges from the discharge valve in the water system, the air can be regarded as fully evacuation.
During debugging function, if no operation is performed within 10s, the debug menu interface will exit. The limit time of this function is 30min. It will automatically exit and shut down the water pump.

 Power Distribution

4.1 Diagram of Power Distribution (The red line represents power line while black line represents the control line.)
4.2 Wiring Diagrams
The following electric diagram is for reference only. Please refer to diagram stuck on the unit as the latest version.
4.2.1 Wiring Diagrams of Compressor Module
Model: GCSHPM048IN / GCSHPM060IN 4.2.2 Wiring Diagrams of A-Coil Module
Model: GCSCAM048GN / GCSCAM060GN 4.3 PCB Layout
4.3.1 Interface
A-Coil Module：
Model: GCSCAM048GN / GCSCAM060GN Mainboard

interface(Reserved)
6| AC_N5| Reserved| 17| CN485| 485 Wired control communication interface
7| FAN_L| Motor live wire input| 18| T-CN2| Thermal pack interface
8| AC_L1| Transformer live wire input (230V）|

19

| CN1| Thermostat control signal terminal
9| AC_N1| Transformer neutral wire input| 20| AC24_N| Transformer neutral wire output
10| FAN_N| Motor neutral wire input| 21| CN-T| AC 24V
11| TC_AC208| Transformer live wire input （208V）|

22

| C24_L| Transformer live wire output

Compressor Module：
Model: GCSHPM048IN / GCSHPM060IN
Mainboard

temperature sensor
No.| Printing| Terminal| No.| Printing| Terminal
---|---|---|---|---|---
| | terminal
3-4. Water outlet temperature sensor terminal 5-6. Liquid pipe temperature sensor terminal| | | terminal 3-4. Discharge temperature sensor terminal
9| T_SENSOR2| Reserved| 10| FA1| Electronic expansion valve terminal
11| IN-SW1| Water flow switch| 12| CN12| 5V DC power supply input
13| H-PRESS| High pressure sensor terminal| 14| HPP2| System high pressure protection terminal
15| LPP2| System low pressure protection terminal| 16| LPP1| System low pressure protection terminal
17| HPP2| System high pressure protection terminal| 18| FAN1| Fan terminal
19| WATER_PUMP| Reserved| 20| PUMP-L| Water pump live wire input
21| PUMP-N| Water pump neutral wire input| 22| 4WAY| 4-way valve
23| CN13| 5V DC power supply output| | |

Filtering Board :
Model: GCSHPM048IN / GCSHPM060IN

wire terminal
3| N| Power input neutral wire terminal| 4| AC-L| Power input live wire terminal
5| L-OUT| Power output live wire terminal| | |

4.3.2 IPM, PFC Testing Method
4.3.2.1Method of Testing IPM Module

1. Preparation before test: prepare a universal meter and turn to its diode option, and then remove the wires U, V, W of the compressor after it is powered off for one minute.

2.  Testing Step
   Step 1: put the black probe on the place P and the red one on the wiring terminal U, V, W respectively as shown in the following figure to measure the voltage between UP, VP and WP.
   Step 2: put the red probe on the place GND and the black one on the wiring terminal U, V, W respectively as shown in the following figure to measure the voltage between NU, NV and NW.

3. If the measured voltages between UP, VP, WP, NU, NV, NV are all among 0.3V-0.7V, then it indicates the IPM module is normal; If any measured valve is 0, it indicates the IPM is damaged.

3.3.2.2 Method of Testing PFC Module Short Circuit

1. Preparation before testing: Prepare a multimeter, then turn it on to the DC voltage mode. After powering off for 20 minutes, remove the AC-L and N wires.
2. Connect the red probe of the multimeter to P and the black probe to GND, confirm that the voltage is less than 10V, and then turn the multimeter on to the diode position.
3.  Place the black probe at point P, and the red probe at points D8-2, D5-2, and D2-2, respectively. Then measure the voltage between D8-2, D5-2, and D2-2 to P. If the voltage between D8-2 and P, D5-2 and P, D2-2 and P is between 0.3 and 0.7V, it indicates that diodes D8, D5, and D2 in the PFC circuit are normal. If the measured value is 0, the PFC circuit is damaged.
4. Place the red probe at the GND point and the black probe at Q9-2, Q10-2, and Q11-2, respectively, to measure the voltage between GND point and Q9-2, Q10-2, and Q11-2. If the voltage value between GND point and Q9-2, Q10-2, and Q11-2 is between 0.3 and 0.7V, it indicates that the MOS tubes Q9, Q10, and Q11 in the PFC circuit are normal. If the measured value is 0, the PFC circuit is damaged.

GCSHPM048IN / GCSHPM060IN 4.4 Error Code
If error occurs during operation, LCD temperature display screen will show the error information. If several errors occur at the same time, their corresponding error codes will be shown in turn. When error occurs, please shut off the unit and send for professional personnel to repair. For example, E1 (as shown below) indicates high pressure protection.

Troubleshooting

4.4.1 “E1” High-Pressure Protection
Error display: Compressor Module mainboard LED display screen Error judgment condition and method:
If the high pressure switch of the unit is detected to trip at 4.2MPa or if the high pressure temperature measured by high pressure sensor exceeds 65℃ for a period of time, the mainboard display screen will display error code “E1” and the unit will shut down. High-Pressure Protection can be cleared by manually powering off the unit. The reset pressure of the high pressure switch is 3.6MPa.
Possible reason：

• Cut-off valve of Compressor module or A-Coil module is not fully opened;
• High-pressure switch or high pressure sensor is abnormal;
• an of Blower module is not working properly;
• ilter or air duct is blocked (heating mode);
• Refrigerant charging amount is too much;
• System pipeline is blocked

Troubleshooting：
Heating Mode: Cooling Mode:  4.4.2 “E2” Anti-Freeze Protection
Error display: Compressor Module mainboard LED display screen Error judgment condition and method:
Under cooling mode, if the temperature of the evaporator (measured by the in- tube temperature sensor) is detected to be lower than the limit value for a continuous period of time, the evaporator is at risk of frosting, the unit will enter Anti-Freezing Protection and shut down. If t he temperature of the evaporator is detected to be higher than the relating value for a period of time, the unit will restart. If t he anti-freezing protection occurs multiple times during a period of time in the cooling mode, the unit will stop and the error code “E2” will be displayed on the main board display screen and the error need to be cleared by manually powering off the unit. For ground water application, if the compressor is not operating and the inlet or outlet water temperature of the Compressor module is below 33.8°F (1℃), water valve will open and the water pump will start to circulate the water in the water loop. The error code “E2” will display on the main board display screen. If the water temperature is higher than 41°F (5℃) for a period of time, the anti- freezing protection will be cleared. The water pump will shut down and water valve will close.
Possible reason：

• Water inlet temperature is too low;
• Fan of Blower module is not working properly;

Troubleshooting： 4.4.3 “E3” Low-Pressure Protection
Error display: Compressor Module mainboard LED display screen Error judgment condition and method:
There are two low pressure switches for the unit. One is for ground water application designed to trip at 0.25MPa (reset at 0.3MPa), the other is for ground-loop application designed to trip at 0.1Mpa (reset at 0.2MPa). When the low pressure switch is detected to trip for a period of time, the unit will shut down and the mainboard display screen will display error code E3. The unit will restart when the low pressure switch has reset within a few minutes. If low pressure protection occurs for several times in a short time, the unit will not restart automatically. You need to restart the unit manually.
Possible reason：

• Cut-off valve of Compressor module or A-Coil module is not fully opened;
• Dip switch of geothermal application on compressor module mainboard is wrong;
• Low-pressure switch is abnormal;
• Fan of Blower module is not working properly;
• Filter or air duct is blocked (cooling mode);
• Refrigerant charging amount is insufficient;
• System pipeline is blocked;
• Refrigerant leakage

Troubleshooting：
Cooling Mode

Heating Mode 4.4.4 “E4” High Discharge Temperature Protection
Error display: Compressor Module mainboard LED display screen Error judgment condition and method:
If the discharge temperature of the unit is detected to be higher than 230°F (110℃) for a period of time, the unit shuts down and displays error code “E4” on the main board display screen. When it is detected that the discharge temperature of the unit is less than the 194°F (90℃) for a period of time, the error will be cleared and the unit will restart. If High Discharge Temperature Protection occurs multiple times within a certain period of time, the error cannot be automatically cleared and need to be cleared manually by powering off the unit. Possible reason：

• Cut-off valve of Compressor module or A-Coil module is not fully opened;
• Electronic expansion valve is abnormal;
• Fan of Blower module is not working properly;
• Refrigerant charging amount is insufficient;
• System pipeline is blocked;
• Refrigerant leakage

Troubleshooting： 4.4.5 “EC” Water Flow Switch Protection
Error display: Compressor Module mainboard LED display screen Error judgment condition and method:
If the water flow switch is detected for a continuous period of time, the system will enter Water Flow Switch  Protection. The error code “EC” will be displayed on the main board display screen, and the unit shuts down. The
error cannot be automatically cleared and can only be cleared through manual power off.
P ossible reason:

• Insufficient water flow in the system
• Water flow switch signal line loosening
• Water flow switch target failure

4.4.6 “C6” Discharge Temperature Sensor Error
Error display: Compressor Module mainboard LED display screen Error judgment condition and method:
The resistance value of discharge temperature sensor is 50 KΩ;
Sample the AD value of temperature sensor through temperature sensor detecting circuit and judge the range of AD value, If the sampling AD value exceeds upper limit and lower limit in 5 seconds continuously, report the error.
Possible reason:

• Poor connection between temperature sensor and terminal in mainboard
• Temperature sensor is abnormal
• Detecting circuit is abnormal

Troubleshooting： 4.4.7 “H5” IPM Protection
Error display: Compressor Module mainboard LED display screen Error judgment condition and method:
When power is connected and drive chip received IPM lead that is of low level, then it is IPM module malfunction. System will shut down for protection.
Possible reason:

• Compressor 3-phase wire connection is lack of phase or phase-reversed.
• System is overloaded and compressor current is too large.
• IPM module is damaged.
• IPM module’s 15V power supply is lower than 13.5V.
• 6-line PWM signal and the corresponding element are abnormal.
• Compressor current sampling circuit element is damaged or drive chip current sampling AD terminal is abnormal.
• Compressor is damaged.

Troubleshooting： 4.4.8 “HC” PFC Protection
Error display: Compressor Module mainboard LED display screen Error judgment condition and method:
After power is connected, and drive chip received PFC lead that is of low level, then it is PFC module malfunction. System will shut down for protection.
Possible reason:

• Power grid voltage is abnormal.
• Main board PFC module is damaged.
• Main board PFC module’s 15V power supply is lower than 13.5V.
• Main board PWM signal for PFC and the corresponding element are abnormal.
• Main board PFC current sampling circuit element is damaged or drive chip current sampling AD terminal is abnormal.

Troubleshooting： 4.4.9 “P8” High Driver Module Temperature Protection
Error display: Compressor module mainboard LED display screen Error judgment condition and method:
If IPM module temperature exceeds the set protection value, then it can be judged that driver module temperature is too high and system will shut down for protection.
Possible reason:

• Thermal grease is not applied or not evenly applied to the module, or there is other substance on the back of the module.
• The module securing screws are not tightened up.
• Compressor module mainboard temperature sampling circuit element is damaged or drive chip temperature sampling AD terminal is abnormal.

Troubleshooting： 4.4.10 “H3” High-Pressure Sensor Error
Error display: Compressor module mainboard LED display screen
Sample the AD value of pressure sensor through pressure sensor detecting circuit and judge the range of4 AD value, If the sampling AD value exceeds upper limit and lower limit in 5 seconds continuously, report the error.

• Poor connection between pressure sensor and terminal in mainboard
• Pressure sensor is abnormal
• Detecting circuit is abnormal

Troubleshooting：

4.4.11 “dc” Suction Temperature Sensor Error
Error display: Compressor module mainboard LED display screen Error judgment condition and method:
The resistance value of suction temperature sensor is 20 KΩ;
Sample the AD value of temperature sensor through temperature sensor detecting circuit and judge the range of AD value, If the sampling AD value exceeds upper limit and lower limit in 5 seconds continuously, report the error.

Possible reason:

• Poor connection between temperature sensor and terminal in mainboard interface
• Temperature sensor is abnormal
• Detecting circuit is abnormal
  Troubleshooting：

4.4.12 “FB” Water Inlet Temperature Sensor Error
Error display: Compressor module mainboard LED display screen
Error judgment condition and method:
The resistance value of water inlet temperature sensor is 20 KΩ;
Sample the AD value of temperature sensor through temperature sensor detecting circuit and judge the range of AD value, If the sampling AD value exceeds upper limit and lower limit in 5 seconds continuously, report the error.
Possible reason:

• Poor connection between temperature sensor and terminal in mainboard interface
• Temperature sensor is abnormal
• Detecting circuit is abnormal
  Troubleshooting：
  

4.4.13 “FM” Water Outlet Temperature Sensor Error
Error display: Compressor module mainboard LED display screen
Error judgment condition and method:
The resistance value of water outlet temperature sensor is 20 KΩ;
Sample the AD value of temperature sensor through temperature sensor detecting circuit and judge the range of AD value, If the sampling AD value exceeds upper limit and lower limit in 5 seconds continuously, report the error.
Possible reason:

• Poor connection between temperature sensor and terminal in mainboard interface
• Temperature sensor is abnormal
• Detecting circuit is abnormal
  Troubleshooting：
  

4.4.14 “A7” Liquid Pipe Temperature Sensor Error
Error display: Compressor module mainboard LED display screen
Error judgment condition and method:
The resistance value of liquid pipe temperature sensor is 20 KΩ;
Sample the AD value of temperature sensor through temperature sensor detecting circuit and judge the range of AD value, If the sampling AD value exceeds upper limit and lower limit in 5 seconds continuously, report the error.
Possible reason:

• Poor connection between temperature sensor and terminal in mainboard interface
• Temperature sensor is abnormal
• Detecting circuit is abnormal
  Troubleshooting：

**![MRCOOL 48K BTU 4T GeoCool 4T Multi Positional 230V 1 Phase 60Hz DC Invert

• Troubleshooting 10](https://manuals.plus/wp-content/uploads/2023/12/MRCOOL- 48K-BTU-4T-GeoCool-4T-Multi-Positional-230V-1-Phase-60Hz-DC-Invert- Troubleshooting-10.png)**

4.4.15 “C2” In-Tube Temperature Sensor Error
Error display: Compressor module mainboard LED display screen
Error judgment condition and method:
The resistance value of in-tube temperature sensor is 20 KΩ;
Sample the AD value of temperature sensor through temperature sensor detecting circuit and judge the range of AD value, If the sampling AD value exceeds upper limit and lower limit in 5 seconds continuously, report the error.
Possible reason:

• Poor connection between temperature sensor and terminal in mainboard interface
• Temperature sensor is abnormal
• Detecting circuit is abnormal
  Troubleshooting：

**![MRCOOL 48K BTU 4T GeoCool 4T Multi Positional 230V 1 Phase 60Hz DC Invert

• Troubleshooting 10](https://manuals.plus/wp-content/uploads/2023/12/MRCOOL- 48K-BTU-4T-GeoCool-4T-Multi-Positional-230V-1-Phase-60Hz-DC-Invert- Troubleshooting-10.png)**

4.4.16 “Cb” Gas Pipe Temperature Sensor Error
Error display: Compressor module mainboard LED display screen
Error judgment condition and method:
The resistance value of gas pipe temperature sensor is 20 KΩ
Sample the AD value of temperature sensor through temperature sensor detecting circuit and judge the range of AD value, If the sampling AD value exceeds upper limit and lower limit in 5 seconds continuously, report the error.
Possible reason:

• Poor connection between temperature sensor and terminal in mainboard interface
• Temperature sensor is abnormal
• Detecting circuit is abnormal
  Troubleshooting：

**![MRCOOL 48K BTU 4T GeoCool 4T Multi Positional 230V 1 Phase 60Hz DC Invert

• Troubleshooting 10](https://manuals.plus/wp-content/uploads/2023/12/MRCOOL- 48K-BTU-4T-GeoCool-4T-Multi-Positional-230V-1-Phase-60Hz-DC-Invert- Troubleshooting-10.png)**

4.4.17 “C1” Return Air Temperature Sensor Error
Error display: Compressor module mainboard LED display screen
Error judgment condition and method:
The resistance value of return air temperature sensor is15 KΩ
Sample the AD value of temperature sensor through temperature sensor detecting circuit and judge the range of AD value, If the sampling AD value exceeds upper limit and lower limit in 5 seconds continuously, report the error.
Possible reason:

• Poor connection between temperature sensor and terminal in mainboard interface
• Temperature sensor is abnormal
• Detecting circuit is abnormal
  Troubleshooting：
  **![MRCOOL 48K BTU 4T GeoCool 4T Multi Positional 230V 1 Phase 60Hz DC Invert

• Troubleshooting 10](https://manuals.plus/wp-content/uploads/2023/12/MRCOOL- 48K-BTU-4T-GeoCool-4T-Multi-Positional-230V-1-Phase-60Hz-DC-Invert- Troubleshooting-10.png)**

4.4.18 “E6” Communication Error
Error display: Compressor module mainboard LED display screen
Error judgment condition and method:
The communication between the compressor module and A-Coil module is bad, the display screen of the compressor module shows the error code, the green light of the A-Coil module mainboard will light for 1 second then flash 6 times. The unit will automatically restart after the communication has recovered for 30 seconds continuously.
Possible reason:

• Poor connection of compressor module mainboard terminal
• Poor connection of A-Coil module mainboard terminal
• The power of A-Coil module or compressor module is cut off
• Detecting circuit is abnormal
• Interference of other equipment
  Troubleshooting：

4.4.19 “PL” DC Bus Under-Voltage Protection or DC Bus Voltage Drop Error
Error display: Compressor module mainboard LED display screen
Error judgment condition and method:
When compressor is running and there is no other error, if busbar voltage is lower than the set value for low voltage protection, the DC Bus Under-Voltage Protection or DC Bus Voltage Drop Error is reported. The display screen of the main board displays the error code, and the unit shuts down.
Possible reason:

• Voltage is abnormal.
• Busbar voltage sampling circuit element is damaged or busbar voltage sampling AD terminal is abnormal.
  Troubleshooting：

4.4.20 “PH” DC Bus Over-Voltage Protection
Error display: Compressor module mainboard LED display screen
Error judgment condition and method:
If there is no other malfunction and the busbar voltage is higher than the set value for high voltage protection, then it can be judged that DC bus over- voltage protection occurs, the display screen of the compressor module shows the error  code. System will shut down for protection.
Possible reason:

• Voltage is abnormal.
• Busbar voltage sampling circuit element is damaged or busbar voltage sampling AD terminal is abnormal.
  Troubleshooting：

4.4.21 “PU” Charging Circuit Error
Error display: Compressor module mainboard display screen
Error judgment condition and method:
When the charge loop starts to get charged and the busbar voltage cannot reach the set value in a certain period of time, the charging circuit error is reported, the display screen of the compressor module shows the error code. System will  shut down for protection.
Possible reason:

• Voltage is too low.
• Charge loop element is abnormal.
• Busbar voltage sampling circuit element is damaged or Busbar voltage sampling AD terminal is abnormal.
  Troubleshooting：

4.4.22 “LF” Power Protection
Error display: Compressor module mainboard LED display screen
Error judgment condition and method:
When the power of the unit is detected to be higher than normal for a continuous period of time, the system will enter Power Protection. The unit shuts down. The display screen of the compressor module shows the error code. After the  compressor is shut down for a period of time, if the power is detected less than the limit value, the error is cleared, and the unit will return to normal and restart. If Power Protection occurs multiple times within a certain period of time,  the error cannot be automatically cleared and can only be cleared through manual power off.

Possible reason:

• Power is too high
• Detecting circuit is abnormal.
  Troubleshooting：

4.4.23 “E5” Current Protection
Error display: Compressor module mainboard LED display screen
Error judgment condition and method:
When the power of the unit is detected to be higher than normal for a continuous period of time, the system will enter Current Protection. The unit shuts down. The display screen of the compressor module shows the error code. After the  compressor is shut down for a period of time, if the current is detected less than the limit value, the error is cleared, and the unit will return to normal and restart. If Current Protection occurs multiple times within a certain period of time,  the error cannot be automatically cleared and can only be cleared through manual power off.
Possible reason:

• The unit current is too high
• Detecting circuit is abnormal.
  Troubleshooting：

4.4.24 “E0” Fan Error
Error display: Compressor module mainboard LED displayer
Error judgment condition and method:
If the fan error is detected for a continuous period of time, the display screen of the compressor module shows the error code, the green light of the A-Coil module mainboard will light for 1 second then flash 2 times. If the detection  returns to normal for a continuous period of time, the unit will return to normal operation. If the continuous trigger protection exceeds a certain number of times, the error cannot be automatically cleared, the need to manually power off  to clear the fault.
If the unit receives fan signal from the thermostat, but the fan does not operate, it is determined that the fan signal wiring between thermostat and the unit is abnormal, and the fan error is reported, the error cannot be automatically  cleared, and can only be manually powered off to clear the error.
Possible reason:

• Fan error
• Detecting circuit is abnormal
• The fan signal wiring between thermostat and the unit is abnormal
  Troubleshooting：
  

4.4.25 “C9” Chip Error
Error display: Compressor module mainboard LED display screen
Error judgment condition and method:
If unit detect chip self-test abnormally, the display screen of the compressor module shows the error code, the error cannot be automatically cleared, and can only be manually powered off to clear the error. Possible reason:

• Chip self-test abnormally

Troubleshooting：
Replace the mainboard of Compressor module.

4.4.26 “LP” Capacity DIP Switch Setting Error
Error display: Compressor module mainboard LED display screen
Error judgment condition and method:
If the capacity of the compressor module and the A-Coil module is not consistent for a period of time, the compressor module mainboard display screen shows the error code, the green light of the A-Coil module mainboard will light for 1  second then flash 1 times and the unit shuts down. The error need to be cleared by manually powering off the unit.
Possible reason:

• Compressor module and A-Coil module capacity dip switch setting error
• Detecting circuit is abnormal
  Troubleshooting：
  

4.5 Failures Not Caused by Errors
(1) If your geothermal unit fails to function normally, please first check the following items before maintenance:

turn it on, in order to protect the compressor and avoid system overload, compressor will delay running for 3min.| Please wait for a while.
Wire connection is wrong.| Connect wires according to the wiring diagram.
Fuse or circuit breaker is broken.| Replace the fuse or switch on the circuit breaker.
Power failure.| Restart after power is resumed.
Power plug is loose.| Re-insert the power plug.
Bad cooling or heating effect.| Air inlet and outlet of the units have been blocked.| Clear the obstacles and keep the room for the units well ventilated.
Improper temperature setting| Reset a proper temperature.
Fan speed is too low.| Reset a proper fan speed.
Doors or windows are open.| Close them.
Exposed under direct sunshine.| Put on curtains or louvers in front of the windows.
Too many heat sources in the room.| Remove unnecessary heat sources.
Filter is blocked or dirty.| Clean or change the filter.

The following situations are not operation failures.

Problem

| Time of occurrence|

Cause

---|---|---
Mist comes from the geothermal unit.| During operation.| If the unit is running under high humidity, the wet air in the room will be quickly cooled down.
The geothermal unit generates some noise.| When the unit is turned on, it purrs.| When the system is just started, the refrigerant is not stable. About 30s later, the purr of the unit

becomes low.

About 40s after the unit first enables the heating mode

| It’s the sound of 4-way valve switching direction. The sound will disappear after the valve changes

its direction.

There is hissing sound when the unit is started or stopped and a slight hissing sound during and

after operation.

| It’s the sound of gaseous refrigerant that stops flowing and the sound of drainage system.
There is a sound of crunching during and after operation.| Because of temperature change, front panel and other components may be swelled up and cause abrasion sound.
There is a hissing sound when the unit is turned on or suddenly stopped during operation.| Because refrigerant suddenly stops flowing or changes the flow direction.
---|---
Dust comes from the geothermal unit.| The unit starts operation after being unused for a long time.| Dust inside the units come out together with the air.
The geothermal unit generates some smell.| During operation.| The room smell or the smell of cigarette comes out through the units.

NOTICE:
Check the above items and adopt the corresponding corrective measures. If the geothermal unit continues to function poorly, please stop the geothermal unit immediately and contact MRCOOL®’s authorized local service center. Ask our professional service staff to check and repair the unit.

Maintenance

5.1 System Diagram

5.2 Connection Pipe Vacuum Pumping

NOTICE

1. Make sure the outlet of vacuum pump is away from fire source and is well-ventilated.
2. Before vacuum pumping, make sure the unit cut-off valves are closed.
3. When vacuum pumping, both the liquid pipe and the gas pipe must be pumped.
   (1) Remove the caps of the liquid pipe cut-off valve, gas pipe cut-off valve and also the service port.
   (2) Meanwhile the gas and liquid pipe cut-off valves should be kept closed in case of refrigerant leak.
   (3) Connect the hose used for evacuation to the vacuum pump.
   (4) Open the switch at the lower pressure side of the manifold valve assembly and start the vacuum pump.
   Meanwhile, the switch at the high pressure side of the manifold valve assembly should be kept closed, otherwise evacuation would fail.
   (5) The evacuation duration depends on the unit’s capacity, generally. Model| Time(min)
   ---|---
   GCSHPM060IN
   GCSCAM060GN| 35
   GCSHPM048IN
   GCSCAM048GN| 35

And verify if the pressure gauge at the low pressure side of the manifold valve assembly reads -0.1Mpa (-750mmHg), if not, it indicates there is leak somewhere. Then, close the switch fully and then stop the vacuum pump.
(6) Wait for 10min to see if the system pressure can remain unchanged. If the pressure increase, there may be leakage.
(7) Slightly open the liquid pipe cut-off valve and let some refrigerant go to the connection pipe to balance the pressure inside and outside of the connection pipe, so that air will not come into the connection pipe when removing the  hose. Notice that the gas and liquid pipe cut-off valve can be opened fully only after the manifold valve assembly is removed.
(8) Place back the caps of the liquid pipe cut-off valve, gas pipe cut-off valve and also the service port.

5.3 Refrigerant Charging

Pre-charging
Step 1: Connect the high pressure gauge line to the valve of liquid pipe and connect the low pressure gauge line to the valve of gas pipe. Connect the middle gauge line to the vacuum pump. Power on the vacuum pump and perform vacuum drying.
Step 2: After vacuum drying, close the high and low pressure gauge valves. Then remove the middle gauge line from the connector of vacuum pump. Then connect to the refrigerant tank.
Step 3: Loosen the middle gauge line from the connector of pressure gauge to a proper extent and slightly open the valve of refrigerant tank. Evacuate the middle gauge line. Then tighten up the connector again and completely open the valve of refrigerant tank at the same time.
Step 4: Keep the refrigerant tank erect and put it on an electronic scale. Record the current weight as m1.

Step 5: Open the high pressure gauge valve (Keep the low pressure gauge valve closed). Then charge refrigerant into the system. Meanwhile, record the weight of refrigerant tank as m2.
Step 6: m1-m2=m. If m equals to the required charging quantity M, close the valve of refrigerant tank at once.
Then move to step 8.
Step 7: If you can’t continue to charge refrigerant into the system and the quantity of charged refrigerant is less than the required charging quantity, then record the current quantity of charged refrigerant: m=m1-m2 m=M-m The remaining charging quantity is: m=M-m Step 8: After charging, remove the pressure gauge.
Refrigerant charging when unit is turned on:
Step 1: Close the valve of refrigerant tank. First remove the pressure gauge lines and connect the compressor module and the A-Coil module. Then reconnect the pressure gauge lines. Connect the low pressure gauge line to the other joint  of gas pipe cut-off valve and connect the high pressure gauge line to the liquid pipe cut-off valve. Connect the middle gauge line to the vacuum pump. Power on the vacuum pump and perform vacuum drying.
Step 2: After vacuum drying, close the high and low pressure gauge valves. Then remove the middle gauge line from the connector of vacuum pump. Then connect to the refrigerant tank.
Step 3: Loosen the middle gauge line from the connector of pressure gauge to a proper extent and slightly open the valve of refrigerant tank. Evacuate the middle gauge line. Then tighten up the connector again and completely open the valve of refrigerant tank at the same time.
Step 4: Turn on the units and let it run for a while.
Step 5: Open the low pressure gauge valve (Keep the high pressure gauge valve closed). Then charge in the remaining charging quantity m`.
Step 6: After all required refrigerant is charged in, close the valve of refrigerant tank.
Step 7: Remove the pressure gauge to finish the refrigerant charging work.
Procedure of refrigerant charging
Following is the supplementary requirement for refrigerant charging on the basis of normal procedure:

1. Make sure that when charging refrigerant into the system, no other types of refrigerant will be mixed.
   The pipeline for refrigerant charging should be as short as possible to reduce the amount of refrigerant left in it.

2. The refrigerant tank should stand erect.

3. Make sure the refrigerating system is already grounded before refrigerant charging.

4. When charging is completed (or not yet completed), stick a label on the system.

5. Before re-charging refrigerant into the system, use oxygen-free nitrogen to perform pressure test. When charging is completed, perform leak test before trial running. Before leaving the workplace, perform a leak test again.

5.4 Maintenance of Major Components
5.4.1 How to replace the compressor
5.4.1.1 Diagnosis of compressor failure
A. On condition that the unit can be started up
Step 1:
If the unit can be started up, then start it up to check the current of the faulted compressor. Use a pressure gauge to measure the pressure of the big and small valves. Connect with a computer to monitor the data. Refer to the following  table based on the recommended working current. The electric current of an inverter compressor will be different under different rotation speed or different working conditions. If the compressor is working at 60Hz, the working current  corresponding to different condensing temperature and evaporating temperature is shown below:
Inverter compressor

Step 2:
Judge whether the operating noise of the compressor is normal, and whether there is a sharp noise or obvious scraping. If there is a normal compressor working nearby, compare their operating noise.
Step 3:
Examine whether the electronic expansion valve of the unit is active and whether the 4-way valve works or not. How to examine:
(1) Electronic expansion valve:
The electronic expansion valve will be reset every time when the unit is powered on or off. Touch the valve and you can feel the movement of the valve spool. In the last stage of the reset process, you will hear the click of the valve and feel its vibration.

Touch the electronic expansion valve:
a. Touch the top of the electronic expansion valve and you can feel their move as they are reset upon startup.
b. Make sure the coil is fixed firmly.
(2) 4-way valve:
During normal operation, the 4 copper tubes that connect to the valve will have different temperature. When the 4-way valve is working, it will generate some noise and vibration. D- Connect to the discharge side
Caution! High temperature!

Labels on the 4-way valve:
D-connect to the discharge side; E-connect to the evaporator of A-Coil module;
S-connect to the inhalation side of the liquid separator; C-connect to the condenser;
When the system is in cooling mode, C-the pipeline is with high pressure and high temperature; E, S-the pipeline is with low pressure and low temperature;
When the system is in heating mode, E-the pipeline is with high pressure and high temperature; C, S-the pipeline is with low pressure and low temperature;
Because D is connected to the discharge side, it is with high pressure and high temperature regardless of the operating mode. When the unit is powered on, in oil return mode, the 4-way valve will produce some noise.
Do not touch the pipes directly with your hands and be cautious of the hot temperature.
Step 4:
Check the drive board of compressor, i.e. the IPM module.
Please refer to the IPM checking method in the section of troubleshooting.
Check the drive board of compressor, i.e. the IPM module.
Please refer to the IPM checking method in the section of troubleshooting.
B．On condition that the unit cannot be started up Step 1:
Cut off the power supply and detach the cover of the wiring box of the compressor. Check the wiring of the compressor.
Step 2:
Check the resistance between the wiring terminals (U, V, W) of compressor.

Refer to the following table for the resistance between any two terminals:

Measure the earth resistance of each wiring terminal. The resistance should be above 10 megohm. If not, we can judge that the compressor is faulted inside.
Step 3:
On condition that the unit cannot be started up, we also need to check the solenoid valve assembly of the system, including the electronic expansion valve. The checking method is the same as instructed above.
Step 4:
Check whether the IPM module is normal. Please refer to the IPM checking method in the section of troubleshooting.
5.4.1.2 Replacement of compressor
Step 1: Preparation
(1) Prepare the components for replacement
When carrying the old and new compressors, do not place the compressors horizontally or upside down. The angle of inclination should be within ±30°. Make sure the lubricant inside the compressors will not flow from the oil balance  mouth. The suction and discharge openings of the compressors must be sealed. If a rubber seal is missing, user adhesive tape to seal the opening. This is to prevent the compressor oil from contacting the air.

NOTICE: Make sure the lubricant is sealed inside the compressors.
Prepare relevant tools

1. Prepare nitrogen. Please strictly follow the nitrogen welding standards during the welding process.
   Make sure there is sufficient nitrogen. The nitrogen pressure should be above 2.0MPa;

2. Prepare welding rods. Prepare some welding rods of common specifications and some special welding rods that contain more than 5% silver. They are used to weld the compressor. The suction and discharge openings of the  compressor are all connected to copper-plated steel pipes, so we need to use special welding rods and solder;

3. Prepare applicable welding tools. Please evaluate how much oxygen and acetylene should be used according to the current welding condition. Try to avoid repeated welding.

4. Prepare a complete set of tools, including an internal hexagonal wrench, diagonal pliers, pincer pliers, nipper pliers, a universal meter, a pressure gauge, cross screwdriver, straight screwdriver, more than two wrenches, insulating  tape and wire cables.

Step 2: Disconnect power
If the compressor needs to be replaced after judging as above, then switch off the compressor module and disconnect the power cable of the compressor module. Use insulating tape to wrap the power cable and put a notice board on the power switch to remind people to be cautious of electric shock.
Step 3: Neaten the electric components
When you detach the compressor wires and temperature sensors, mark them correspondingly for the convenience of reconnecting them.
Step 4: Discharge refrigerant
Discharge refrigerant from the system. Discharge simultaneously from the high pressure side and low pressure side. Do not discharge too fast (It should take more than 12h to completely discharge the refrigerant); otherwise, large quantity of lubricant will escape from the system together with the refrigerant.
Step 5: Detach the compressor
Check the condition of the damaged compressor, including its position and model.
If the information of the compressor is confirmed, check the oil quality.
(a) If the oil is clear and impurities-free, we consider that the oil of the system is not polluted. Meanwhile, if we confirm that the valves and pipes are also normal, then we can replace the compressor only. For the removal of compressor,  please refer to the section: Removal of Major Components.
How to check oil quality?

1. After the compressor is detached, put it on a solid ground and shake it at an angle of 30~45° to ensure that the contaminant at the bottom of the compressor can be poured out.
2. Place the compressor at a position above the ground level and then pour out the oil from the air outlet of the compressor. Collect the oil in a transparent container. The amount of oil should be over 150ml.

NOTE:

1. The axial direction of the compressor should not slant at an angle larger than 20° to the horizontal direction.
2. Prevent the compressor from falling.
3. Put a transparent container (over 150ml in volume) under the discharge pipe to collect the compressor oil, thus we can see the oil quality.
4. Put the container of compressor lubricant in a bright location and see if there is impurity and discoloration. Sniff at the compressor lubricant. Normally, there is no pungent smell.
   (b) If the oil is contaminated, replace the compressor and the gas-liquid separator.
   NOTE: Confirm whether the compressor needs to be replaced. The pipe mouths of the faulted compressor must be sealed by adhesive tape as soon as the compressor is detached. Make sure the compressor is well preserved for the ease of future analysis.

Step 6: Clear the pipeline
After confirming which parts of the system should be replaced, check the pipeline of the system. Blow through the main pipeline with nitrogen. After clearing the pipeline, if the components are not replaced immediately, seal the pipeline  with adhesive tape to prevent the system from being contaminated by water and impurities in the air.
Step 7: Replace the compressor
For the removal of compressor, please refer to the section: Removal of Major Components.
Step 8: Check the system for leaks

1. First of all, check each welding point. Check whether the welding points are smooth and whether there is any obvious welding hole or other abnormal condition.
2. Next, fill high-pressure nitrogen into the system for leak detection. If it is only the compressor module that needs to be repaired and the A-Coil module is confirmed normal, then it’s OK to charge high-pressure nitrogen into the  compressor module only. Fill in the nitrogen simultaneously from the high pressure side and low pressure side. We recommend charging the nitrogen from the big and small valves at the same time. The pressure of nitrogen should be above 20kgf. Then use soapy water to check for leaks. Check the welding points particularly.
3. Finally, retain the pressure of the system. Fill high-pressure nitrogen into the system and maintain the pressure above 25kgf. Close the big and small valves and keep the pressure of A-Coil module and compressor module for more  than 12h. If the pressure remains unchanged, then start vacuum pumping; otherwise, check the system for leaks again.
   Temperature should be considered when judging the pressure change. If temperature changes by 33.8°F (1℃), pressure will change by 0.01MPa or so.
   For example, if temperature is 86°F (30℃) when nitrogen of 2.5MPa is charged, and temperature changes to 77°F (25℃) after 12h, we consider that the system is qualified if the pressure is found at 2.43MPa or above.
   Step 9: Evacuate the system and charge refrigerant
   Please refer to the section of maintenance: vacuum pumping and refrigerant charging.
   Step 10: Connect electric components
   Connect cables, compressor wires and the electric heating belt according to the signs marked before and the wiring diagram on the cover of the electric box.

5.4.2 How to replace the drive module of compressor
Step 1: First, make sure that power is cut off. Set the universal meter at the AC voltage and measure the voltage between AC-L and N. If each time the voltage is 0V (Errors may occur to the universal meter, sometimes the voltage may not  be 0V), proceed with the next step and put a sign on the power switch that reads “Under maintenance, don’t switch on”.
Step 2: Measure the voltage between DC bus P and UN on the drive board of the compressor. Set the universal meter at the DC voltage and measure the voltage between P and UN as shown below. If the voltage is below 36V, proceed with the next step. In case that a universal meter is not available, disconnect power for 20min and then continue with the next step.
Step 3: Remove all the wires on the drive board of the compressor with insulation glove.
Step 4: Remove the screws on the drive board of the compressor. The screws are located in the white circles as shown above in the picture.
Step 5: Replace with a new compressor drive board. Before replacement, apply some silica gel on the IPM module、rectifier，MOSFET and diode.
Step 6: Install the new compressor drive board. Fix the screws and connect the wires correctly.

5.5 Removal of Major Components
5.5.1 Major Components of Compressor Module

Picture

| Name|

Function

---|---|---

| Compressor| Through compression, the low pressure refrigerant occupies a less space. As its pressure and temperature both rise, it becomes high pressure and high temperature refrigerant. It is the power drive of the system.

| 4-Way Valve| Usually used in heat pump systems to switch the flow direction of refrigerant in the system, in order to achieve the conversion of unit cooling and heating

| Fan| Introduce external air into the unit and cool the heating module on the main board through a heat sink to ensure normal operation of the main board.

| Condenser| It is used to transfer partial heat of the hot flow to the cold flow so that the flow temperature can reach the specified index. It is an energy exchanging device.
---|---|---
****| Electronic Expansion Valve| The unit is equipped with two electronic expansion valves, located in the Compressor module and the A-Coil module, respectively, for the control of heating mode and cooling mode. The function of the electronic expansion valve is as follows:
1. Throttling and depressurization of high-pressure liquid refrigerant to ensure the pressure difference between the condenser and evaporator.
2. Adjust the refrigerant flow rate entering the evaporator to adapt to changes in the heat load of the evaporator and ensure stable  operation of the refrigeration device.

| Water-Flow Switch| Prevent freezing of the heat exchanger caused by a decrease in circulating water flow in the water system; Has anti freezing effect; When the system water volume decreased to its action setting value at that time, the stress on the target is reduced, resulting in the disconnection of the working path, the unit alarms and stops running.

| Radiator| The air blown in by the fan cools the heating module behind the main board to ensure that the main board works normally.

| High Pressure Sensor| Used to detect high pressure in the system, control the operation of the fan, and also have a system pressure protection function. When the pressure is too high, it will trigger relevant pressure protection actions.

| High Pressure Switch| Used for detecting the high-pressure pressure of the unit in ground water system. Detect the system high-pressure, in order to protect the unit from abnormal operation. When the system high-pressure is higher than the set value, an error will be displayed and the unit will not start or stop.

| Low Pressure Switch 2| Used for detecting the low-pressure pressure of the unit in ground loop system. Detect the system low-pressure, in order to protect the unit from abnormal operation. When the system low-pressure is lower than the set value, an error will be displayed and the unit will not start or stop.
---|---|---
****| Low Pressure Switch 1| Used for detecting the low-pressure pressure of the unit in ground water system. Detect the system low-pressure, in order to protect the unit from abnormal operation. When the system low-pressure is lower than the set value, an error will be displayed and the unit will not start or stop.

| One Way Valve| The unit is equipped with two one-way valves, each connected in parallel in two electronic expansion valve flow paths, to ensure one-way flow of the refrigerant circuit.
****| Filter| Located before and after the electronic expansion valve, it is used to filter impurities in the system and prevent blockage.

5.5.2 Major Components of A-Coil Module

Picture

| Name|

Function

---|---|---
| Electronic Expansion Valve| The unit is equipped with two electronic expansion valves, located in the Compressor module and the A-Coil module, respectively, for the control of heating mode and cooling mode. The function of the electronic expansion valve is as follows:
1. Throttling and depressurization of high-pressure liquid refrigerant to ensure the pressure difference between the condenser and evaporator.
2. Adjust the refrigerant flow rate entering the evaporator to adapt to changes in the heat load of the evaporator and ensure stable  operation of the refrigeration device.
| Evaporator| Used for high-temperature and high-pressure gaseous refrigerant condensing and liquefying or low-temperature and low-pressure refrigerant evaporating; The condensation heat is carried away by the circulating air or the heat required for evaporation is provided by the indoor circulating air.
| One Way Valve| The unit is equipped with two one-way valves, each connected in parallel in two electronic expansion valve flow paths, to ensure one-way flow of the refrigerant circuit.

| Filter| Located before and after the electronic expansion valve, it is used to filter impurities in the system and prevent blockage.
---|---|---

5.5.3 Major Components of Blower Module

Picture

| Name|

Function

---|---|---

| Motor| The power drive of the fan. It enables the fan to run so as to provide smooth currents of air for forced convection and heat exchange of condenser and evaporator.

5.5.4 Removal of Compressor Module Major Components
Model: GCSHPM048IN / GCSHPM060IN

Removal of compressor

NOTE ： Before removing the compressor, make sure there is no refrigerant in the pipeline and power is cut off.
Step| Picture| Work instruction
1. Dismantle the screws| | Dismantle the four screws that fix the lid (note: during the integral installation, the unit has already removed this lid, and this step can be ignored)
2. Remove the lid| | Remove the lid (note: during the integral installation, the unit has already removed this lid, and this step can be ignored)
3. Remove the screws that secure the top cover| | Remove the 23 screws that secure the top cover
4. Remove the cover| | Remove the cover
5. Remove the screws fixing the Panel (front)| | Pull out the two rubber plugs of the panel (front), and then remove the five screws fixing the Panel (front), and the four bolts fixing the Computer fan (note: there are also two screws under the rubber plug)
---|---|---
6. Remove the Panel (front)| | Remove the Panel (front)
7. Remove the screws fixing the Panel (left) and Panel (valve)| | Pull out the 2 rubber plugs on the Panel (left), and then remove the 5 screws that secure the Panel (left) (note: there are also two screws under the rubber plugs)
Dismantle the four screws that fix the size globe valve, the four bolts that fix the inlet and outlet water pipes, and the two screws that fix the Panel (valve)
8. Remove the Panel (left) and Panel (valve)| | Remove the panel (left)
Remove the panel (valve) (Note: Before removing the panel (valve), it is necessary to first remove the bracket next to the fixed bracket of the large and small shut-off valves, and fix it with two screws )

5.6 Explosive View and Lists of Parts
5.6.1 Compressor Module Explosive View and Lists of Parts
Model: GCSHPM060IN

Model: GCSHPM048IN

No.

| Material name|

Part Number

---|---|---
1| O-Ring| 760010000026
2| High Pressure Sensor| 43004400001503
3| Front Panel Sub-Assy| 209004060461
4| Water Flow Switch| 430019000006
5| Double Pipe Heat Exchanger| 010011060075
6| 4 Way Valve Coil| 07201006000603
7| 4-Way Valve| 43000338
8| Lid| 012035062355P
---|---|---
9| Top Cover Sub-Assy| 017069060114P
10| Air Duct Sub-assy| 017107060214
11| Front Panel| 209004060460
12| High Pressure Switch| 46020006
13| Low Pressure Switch(Ground Water)| 460200044
14| Low Pressure Switch(Ground Loop)| 4602001596
15| Electrical Retaining Plate| 20022700000101
16| Terminal Board| 42200006001201
17| Terminal Board| 42000100000102
18| Filter Board| 300020060118
19| Main Board| 300027063706
20| Terminal Board| 422000000010
21| Connection Board| 012077062176P
22| Electric Raceway| 4201030203
23| Front Panel Sub-Assy| 209004060463
24| Supporter| 012060084641P
25| Rubber Band| 7661280504
26| Radiator| 430034060222
27| Electric Expand Valve Fitting| 4304413266
28| Electronic Expansion Valve| 072009060008
29| One Way Valve| 071001060011
30| Sensor Insert| 42020063
31| Supporter| 012060086009P
32| Tube Clip| 021400053P
33| Base Frame Assy| 000043060667
34| Supporter| 012060084642P
35| Front Panel Sub-Assy| 209004060455
36| Front Panel Sub-Assy| 209004060448
37| Terminal Board| 42010185
38| Supporter| 012060086133P
39| Cable-Cross Loop| 765100263
40| Fan(radiation)| 49010501
41| Rubber cover| 22240007
42| Filter| 035021060019
43| Electric Box Assy| 100002080271
44| Front Panel| 012073063661P
45| Cut-off valve 3/8(N)| 071302391
46| Temp Sensor Sleeving| 05212423
47| Cut off Valve| 070001000009
48| Handle| 2690410001601
49| Compressor and Fittings| 009001060898
50| Temperature Sensor clamp| 02145007
51| Sensor Sub-assy| 390002060442

5.6.2 A-Coil Module Explosive View and Lists of Parts
Model: GCSCAM060GN

Model: GCSCAM048GN

No.

| Material name|

Part Number

---|---|---
1| Rear Side Plate Sub-Assy| 017051060175
2| Filter| 035021060019
3| Evaporator Assy| 011001062780
4| Right Side Plate Sub-Assy| 000130060170
5| Air Outlet Frame Sub-assy| 000117060028
6| Water Tray| 2690220601
7| Sensor Insert| 42020063
8| Choke Plug| 76718209
9| Retaining Plate (Water Level Switch)| 012066062210
---|---|---
10| Support Assy| 000157060222
11| Cable-Cross Loop| 765100263
12| Cover Plate Sub-Assy| 011657060546
13| Plastic Cover| 26902209
14| Cover Plate Sub-Assy| 011657060547
15| Cover Plate Sub-Assy| 011657060556
16| Electric Box Cover| 012020061074P
17| Electric Box Assy| 100002081473
18| Rubber Band| 7661280504
19| Rubber Band| 7661280503
20| Support Assy| 000157060224
21| Cut off Valve 3/4N| 070001000009
22| Temp Sensor Sleeving| 05212423
23| Cut off Valve 3/8N| 071302391
24| Water Tray| 2690220501
25| One Way Valve| 071001060012
26| Tube Clip| 021400053P
27| Electronic Expansion Valve| 072009060008
28| Left Side Plate Sub-Assy| 017037060351
29| Electric Expand Valve Fitting| 07200206002329
30| Support Assy| 000157060223
31| Top Cover Sub-Assy| 000051060221
32| Transformer| 43110286
33| Terminal Board| 422000060007
34| Main Board| 300002063947
35| Cable Cross Loop| 76510021
36| Terminal Board| 42000100000102
37| Cable Cross Loop| 76510021

5.6.3 Blower Module Explosive View and Lists of Parts
Model: GCSBLM013 / GCSBLM014

No.

| Material name|

Part Number

---|---|---
1| Front Panel Sub-Assy| 209004060428
2| Top Cover Sub-Assy| 000051060226
3| Supporter| 012060084723P
4| Front Panel Sub-Assy| 209004060427
5| Front Panel Sub-Assy| 209004060429
6| Retaining Plate Sub-Assy| 017032060759
7| Fan fixing plate assembly 1| 01842232
8| Cover Plate Sub-Assy| 011657060549P
9| Wire| 012222000025
10| Sponge| 110000076297
11| Front Panel Sub-Assy| 209004060430
12| Support Assy| 000157060233
13| Centrifugal fan assy| 000052060818
14| Centrifugal Fan Housing| 1570220301
15| Brushless DC Motor| 15010400001304

COMMON PARAMETER LISTS

5.1 Temperature/Pressure List of Refrigerant

R410A

Temperature| Pressure| | Temperature| Pressure| | Temperature| Pressure
℃| kPa| ℃| kPa| ℃| kPa
-30| 275| 0| 803| 30| 1880
-29| 286| 1| 823| 31| 1910
-28| 298| 2| 851| 32| 1960
-27| 311| 3| 879| 33| 2030
-26| 324| 4| 903| 34| 2080
-25| 334| 5| 937| 35| 2130
-24| 348| 6| 962| 36| 2180
-23| 363| 7| 994| 37| 2240
-22| 375| 8| 1020| 38| 2290
-21| 391| 9| 1050| 39| 2350
-20| 404| 10| 1090| 40| 2410
-19| 424| 11| 1110| 41| 2460
-18| 435| 12| 1150| 42| 2510
-17| 453| 13| 1180| 43| 2580
-16| 468| 14| 1220| 44| 2650
-15| 483| 15| 1250| 45| 2710
-14| 504| 16| 1280| 46| 2770
-13| 520| 17| 1320| 47| 2840
-12| 538| 18| 1350| 48| 2910
-11| 556| 19| 1400| 49| 2980
-10| 579| 20| 1440| 50| 3050
-9| 598| 21| 1470| 51| 3100
-8| 618| 22| 1520| 52| 3180
-7| 639| 23| 1560| 53| 3250
-6| 660| 24| 1600| 54| 3320
-5| 682| 25| 1640| 55| 3400
-4| 705| 26| 1680| 56| 3480
-3| 728| 27| 1730| 57| 3540
-2| 752| 28| 1780| 58| 3630
-1| 777| 29| 1820| 59| 3720

5.2 Resistance / Temperature Lists of Temperature Sensors
5.2.1 Voltage list of 15 kΩ temperature sensors (including return air temperature sensors)

Temp.

（℃）

| Resistance

(kΩ)

| Voltage

(15K/5V)

| Voltage

(15K/3.3V）

| Temp.

（℃）

| Resistance

(kΩ)

| Voltage

(15K/5V)

| Voltage

(15K/3.3V）

---|---|---|---|---|---|---|---
-20| 144| 0.472| 0.311| 25| 15| 2.5| 1.65
-19| 138.1| 0.49| 0.323| 26| 14.36| 2.554| 1.686
-18| 128.6| 0.522| 0.345| 27| 13.74| 2.61| 1.722
-17| 121.6| 0.549| 0.362| 28| 13.16| 2.663| 1.758
-16| 115| 0.577| 0.381| 29| 12.6| 2.717| 1.793
-15| 108.7| 0.606| 0.4| 30| 12.07| 2.771| 1.829
-14| 102.9| 0.636| 0.42| 31| 11.57| 2.823| 1.863
-13| 97.4| 0.667| 0.44| 32| 11.09| 2.875| 1.897
-12| 92.22| 0.699| 0.462| 33| 10.63| 2.926| 1.931
-11| 87.35| 0.733| 0.484| 34| 10.2| 2.976| 1.964
-10| 82.75| 0.767| 0.506| 35| 9.779| 3.027| 1.998
-9| 78.43| 0.803| 0.53| 36| 9.382| 3.076| 2.03
-8| 74.35| 0.839| 0.554| 37| 9.003| 3.125| 2.062
-7| 70.5| 0.877| 0.579| 38| 8.642| 3.172| 2.094
-6| 66.88| 0.916| 0.605| 39| 8.297| 3.219| 2.125
-5| 63.46| 0.956| 0.631| 41| 7.653| 3.311| 2.185
-4| 60.23| 0.997| 0.658| 42| 7.352| 3.355| 2.215
-3| 57.18| 1.039| 0.686| 43| 7.065| 3.399| 2.243
-2| 54.31| 1.082| 0.714| 44| 6.791| 3.442| 2.272
-1| 51.59| 1.126| 0.743| 45| 6.529| 3.484| 2.299
0| 49.02| 1.172| 0.773| 46| 6.278| 3.525| 2.326
1| 46.8| 1.214| 0.801| 47| 6.038| 3.565| 2.353
2| 44.31| 1.265| 0.835| 48| 5.809| 3.604| 2.379
3| 42.14| 1.313| 0.866| 49| 5.589| 3.643| 2.404
4| 40.09| 1.361| 0.899| 50| 5.379| 3.68| 2.429
5| 38.15| 1.411| 0.931| 51| 5.179| 3.717| 2.453
6| 36.32| 1.461| 0.965| 52| 4.986| 3.753| 2.477
7| 34.58| 1.513| 0.998| 53| 4.802| 3.787| 2.5
8| 32.94| 1.564| 1.033| 54| 4.625| 3.822| 2.522
9| 31.38| 1.617| 1.067| 55| 4.456| 3.855| 2.544
10| 29.9| 1.67| 1.102| 56| 4.294| 3.887| 2.566
11| 28.51| 1.724| 1.138| 57| 4.139| 3.919| 2.586
12| 27.18| 1.778| 1.174| 58| 3.99| 3.949| 2.607
13| 25.92| 1.833| 1.21| 59| 3.848| 3.979| 2.626
14| 24.73| 1.888| 1.246| 60| 3.711| 4.008| 2.646
15| 23.6| 1.943| 1.282| 61| 3.579| 4.037| 2.664
16| 22.53| 1.998| 1.319| 62| 3.454| 4.064| 2.682
17| 21.51| 2.054| 1.356| 63| 3.333| 4.091| 2.7
---|---|---|---|---|---|---|---
18| 20.54| 2.11| 1.393| 64| 3.217| 4.117| 2.717
19| 19.63| 2.166| 1.429| 65| 3.105| 4.143| 2.734
20| 18.75| 2.222| 1.467| 66| 2.998| 4.167| 2.75
21| 17.93| 2.278| 1.503| 67| 2.898| 4.19| 2.766
22| 17.14| 2.334| 1.54| 68| 2.797| 4.214| 2.781
23| 16.39| 2.389| 1.577| 69| 2.702| 4.237| 2.796
24| 15.68| 2.445| 1.613| 70| 2.611| 4.259| 2.811

5.2.2 Voltage list of 20 kΩ pipeline temperature sensors (including temperature sensors for water inlet, water outlet, liquid/gas pipe, suction, in-tube)

Temp.
（℃）| Resistance
(kΩ)| Voltage
(15K/5V)| Voltage
(15K/3.3V）| Temp.
（℃）| Resistance
(kΩ)| Voltage
(15K/5V)| Voltage
(15K/3.3V）
---|---|---|---|---|---|---|---
-30| 911.56| 0.054| 0.036| 8| 107.96| 0.424| 0.28
-29| 853.66| 0.058| 0.038| 9| 102.85| 0.443| 0.292
-28| 799.98| 0.062| 0.041| 10| 98.006| 0.463| 0.306
-27| 750.18| 0.066| 0.043| 11| 93.42| 0.483| 0.319
-26| 703.92| 0.07| 0.046| 12| 89.075| 0.505| 0.333
-25| 660.93| 0.075| 0.049| 13| 84.956| 0.527| 0.348
-24| 620.94| 0.079| 0.052| 14| 81.052| 0.549| 0.362
-23| 583.72| 0.084| 0.056| 15| 77.349| 0.572| 0.378
-22| 549.04| 0.089| 0.059| 16| 73.896| 0.596| 0.393
-21| 516.71| 0.095| 0.063| 17| 70.503| 0.621| 0.41
-20| 486.55| 0.101| 0.066| 18| 67.338| 0.647| 0.427
-19| 458.4| 0.107| 0.07| 19| 64.333| 0.673| 0.444
-18| 432.1| 0.113| 0.075| 20| 61.478| 0.7| 0.462
-17| 407.51| 0.12| 0.079| 21| 58.766| 0.727| 0.48
-16| 384.51| 0.127| 0.084| 22| 56.189| 0.755| 0.499
-15| 362.99| 0.134| 0.088| 23| 53.738| 0.784| 0.518
-14| 342.83| 0.142| 0.094| 24| 51.408| 0.814| 0.537
-13| 323.94| 0.15| 0.099| 25| 49.191| 0.845| 0.558
-12| 306.23| 0.158| 0.104| 26| 47.082| 0.876| 0.578
-11| 289.61| 0.167| 0.11| 27| 45.074| 0.908| 0.599
-10| 274.02| 0.176| 0.116| 28| 43.163| 0.941| 0.621
-9| 259.37| 0.186| 0.123| 29| 41.313| 0.974| 0.643
-8| 245.61| 0.196| 0.129| 30| 39.61| 1.008| 0.665
-7| 232.67| 0.206| 0.136| 31| 37.958| 1.043| 0.688
-6| 220.5| 0.217| 0.143| 32| 36.384| 1.078| 0.711
-5| 209.05| 0.228| 0.151| 33| 34.883| 1.114| 0.735
-4| 198.27| 0.24| 0.158| 34| 33.453| 1.151| 0.759
-3| 188.12| 0.252| 0.167| 35| 32.088| 1.188| 0.784
-2| 178.65| 0.265| 0.175| 36| 30.787| 1.226| 0.809
-1| 169.68| 0.278| 0.184| 37| 29.544| 1.264| 0.835
0| 161.02| 0.292| 0.193| 38| 28.359| 1.303| 0.86
1| 153| 0.307| 0.202| 39| 27.227| 1.343| 0.886
2| 145.42| 0.322| 0.212| 40| 26.147| 1.383| 0.913
3| 138.26| 0.337| 0.223| 41| 25.114| 1.424| 0.94
4| 131.5| 0.353| 0.233| 42| 24.128| 1.465| 0.967
5| 126.17| 0.367| 0.242| 43| 23.186| 1.507| 0.994
6| 119.08| 0.387| 0.256| 44| 22.286| 1.549| 1.022
7| 113.37| 0.405| 0.267| 45| 21.425| 1.591| 1.05
45| 21.425| 1.591| 1.05| 88| 4.7541| 3.389| 2.237
---|---|---|---|---|---|---|---
46| 20.601| 1.634| 1.078| 89| 4.6091| 3.423| 2.259
47| 19.814| 1.677| 1.107| 90| 4.4693| 3.456| 2.281
48| 19.061| 1.721| 1.136| 91| 4.3345| 3.488| 2.302
49| 18.34| 1.764| 1.164| 92| 4.2044| 3.52| 2.323
50| 17.651| 1.808| 1.193| 93| 4.0789| 3.551| 2.344
51| 16.99| 1.853| 1.223| 94| 3.9579| 3.582| 2.364
52| 16.358| 1.897| 1.252| 95| 3.841| 3.612| 2.384
53| 15.753| 1.942| 1.281| 96| 3.7283| 3.642| 2.404
54| 15.173| 1.986| 1.311| 97| 3.6194| 3.671| 2.423
55| 14.618| 2.031| 1.34| 98| 3.5143| 3.7| 2.442
56| 14.085| 2.076| 1.37| 99| 3.4128| 3.728| 2.46
57| 13.575| 2.121| 1.4| 100| 3.3147| 3.755| 2.478
58| 13.086| 2.166| 1.429| 101| 3.22| 3.782| 2.496
59| 12.617| 2.211| 1.459| 102| 3.1285| 3.809| 2.514
60| 12.368| 2.235| 1.475| 103| 3.0401| 3.834| 2.531
61| 11.736| 2.3| 1.518| 104| 2.9547| 3.86| 2.547
62| 11.322| 2.345| 1.548| 105| 2.8721| 3.884| 2.564
63| 10.925| 2.389| 1.577| 106| 2.7922| 3.909| 2.58
64| 10.544| 2.434| 1.606| 107| 2.715| 3.932| 2.595
65| 10.178| 2.478| 1.635| 108| 2.6404| 3.956| 2.611
66| 9.8269| 2.522| 1.664| 109| 2.5682| 3.978| 2.626
67| 9.4896| 2.565| 1.693| 110| 2.4983| 4.001| 2.64
68| 9.1655| 2.609| 1.722| 111| 2.4308| 4.022| 2.655
69| 8.9542| 2.638| 1.741| 112| 2.3654| 4.044| 2.669
70| 8.5551| 2.695| 1.778| 113| 2.3021| 4.064| 2.682
71| 8.2676| 2.737| 1.806| 114| 2.2409| 4.085| 2.696
72| 7.9913| 2.779| 1.834| 115| 2.1816| 4.105| 2.709
73| 7.7257| 2.821| 1.862| 116| 2.1242| 4.124| 2.722
74| 7.4702| 2.862| 1.889| 117| 2.0686| 4.143| 2.734
75| 7.2245| 2.903| 1.916| 118| 2.0148| 4.162| 2.747
76| 6.9882| 2.943| 1.943| 119| 1.9626| 4.18| 2.759
77| 6.7608| 2.983| 1.969| 120| 1.9123| 4.197| 2.77
78| 6.542| 3.023| 1.995| 121| 1.8652| 4.214| 2.781
79| 6.3315| 3.062| 2.021| 122| 1.8158| 4.232| 2.793
80| 6.1288| 3.1| 2.046| 123| 1.7698| 4.248| 2.804
81| 5.9336| 3.138| 2.071| 124| 1.7253| 4.264| 2.814
82| 5.7457| 3.175| 2.096| 125| 1.6821| 4.28| 2.825
83| 5.5647| 3.212| 2.12| 126| 1.6402| 4.295| 2.835
84| 5.3903| 3.249| 2.144| 127| 1.5996| 4.31| 2.845
85| 5.2223| 3.285| 2.168| 128| 1.5602| 4.325| 2.855
86| 5.0605| 3.32| 2.191| 129| 1.522| 4.34| 2.864
87| 4.9044| 3.355| 2.214| 130| 1.485| 4.354| 2.873

Operation Tools

The following tools will be used: 1) Liquid-level gauge; 2) Screwdriver; 3) Electric driven rotary hammer; 4) Drill; 5) Pipe expander; 6) Torque wrench; 7) Open-end wrench; 8) Pipe cutter; 9) Leak detector; 10) Vacuum pump; 11) Pressure gauge; 12) Universal meter; 13) Hexagon wrench; 14) Tapeline.

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