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7、System debugging
1).Please read the manual of outdoor unit carefully and vacuum and add refrigerant according to the above requirements;
2).After the basic liquid dosage is completed, power on, turn on the refrigeration, and add 100g refrigerant. If the low-pressure pressure decreases within 5 minutes, gradually increase it by 20g each time until the low-
pressure pressure is at a reasonable position and does not decrease any more.
3).After the second step is completed, the cabinet continues to cool down, the display temperature reaches the required temperature, and it can be started and stopped normally.
4).After the temperature in the box is stable, the single startup time generally does not exceed 30 minutes. If it exceeds, the system and environmental conditions need to be checked again.
8
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Installation diagram
七.Common faults and handling methods
Fault phenomenon Possible causes of failure
No display of temperature controller
No voltage Fuse blown
Voltage
Wrong circuit connection or poor contact
display"E1/E2/E3"
Cabinet temperature/evaporator/ Condenser sensor failure
display"cH/rH/rL"
condenser/high temperature/ Low temperature alarm
Compressor inoperative
Do not show "out"
Set temperature not reached
Probe position dislocation
display "out”
Wrong circuit connection or poor contact
Voltage below 187v
The thermostat is damaged
Inspection contents processing method Remarks
Checkthe fuse Replace the fuse
Ask an electrician to repair it if necessary
Check wiring and plugs
Adjusi the wiring and tighten the plug
Checkthe plug
Tighten or replace the probe wire
Refrigeration system and surrounding
environment
Press any key to cancel the sound
- -
Ask professional personnel for maintenance
Check probe position
Adjust position
Check wiring and plugs
Adjust the wiring and tighten the plug
Check the power supply voltage
Connect the voltage regulator
Two pins are open circuit Replace the thermostat
The compressor operates continuously without
shutdown
The temperature in the box is too high
Foo much frost on the evaporator
indoor temperature. High humidity
High outdoor temperature or poor heat
dissipation
Airduct blockage
Refrigerant leakage
The temperature in the box is too low
Wrong position of signal line
Thermostat failure
Excessive noise
The fan is damaged or the fan blade is deformed
The box is not laid flat
The fixing screw of the press is loose
evaporator Air outlet Forced defrosting
Self inspection
Indoor air environment Raise the set temperature
Outdoor temperature and heat dissipation
environment
Improve the cooling space of condenser
Suction outlet 、 Air outlet
Organize goods
Ask maintenance personnel
Unit line Check with a multimeter
Self inspection
Replace the thermostat
Fan Replace the fan or blade
Self inspection
Whether the 4 feet touch the ground
Timely pad
Are the screws tight Tighten the screws
Be careful. The following phenomena are not faults:
When the product is running, it makes a running sound or "silky" sound, which is the sound of refrigerant flowing in the system0
There is running water at the bottom of the box, which is the condensate of the evaporator,rainy season or humid environment, there is water dew on the side
glass, the edge of the air outlet and the surface of the air return glass, which is not a fault. Just wipe it off with a rago
The thermostat displays "def" and "DF", which is not a fault It is a normal phenomenon and defrosting is displayed.