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Technical Information
Service Manual
(14)Electric heating band control of outdoor unit
①
Compressor electric heating band control:
a) Start condition: the compressor is in off status and the T
outdoor ambient temperature
≤-5°C.
b) Stop condition: the band is off when either of the below condition is met:
1.The compressor is in on status;
2.The compressor is in off status and the T
outdoor ambient temperature
≥-5°C.
c) When outdoor ambient temperature sensor is in malfunction status, the electric heating band stops operation.
②
Condenser electric heating band control:
1.When T
outdoor ambient
≤1°C, the electric heating band starts working;
2. When enter defrosting and defrosting is finished, the chassis electric heating band starts working for 3min as the compressor
starts. After the compressor starts for 3min and T
outdoor ambient
≥3°C, the electric heating band stops operation.
3.When T
outdoor ambient
≥3°C, the condenser electric heating band doesn’t work.
4.When 1°C<T
outdoor ambient
<3°C, the condenser electric heating band keeps the previous status.
When outdoor ambient temperature sensor is in malfunction status, the electric heating band stops operation; the electric heating
band can work again after 2min of last stop.
(15)Compulsory defrosting function
①
Start up compulsory defrosting function
Under ON status, set heating mode with remote controller and adjust the temperature to 16°C. Press “+, -, +, -, +,-” button successively
within 5s and the complete unit will enter into compulsory defrosting status. Meanwhile, heating indicator will ON 10s and OFF 0.5s
successively. (Note: If complete unit has malfunction or stops operation due to protection, compulsory defrosting function can be started
up after malfunction or protection is resumed.
②
Exit compulsory defrosting mode
After compulsory defrosting is started up, the complete unit will exit defrosting operation according to the actual defrosting result, and the
complete unit will resume normal heating operation.
(16)Refrigerant recovery function (applicable for moving the unit or maintaining the unit)
①
Start up refrigerant recovery function
Set cooling mode with remote controller within 5min after energization, adjust temperature at 16°C and press light button on remote
controller for 3 times successively to any one indoor unit within 3s and then the complete unit will enter into refrigerant recovery status.
All indoor units display Fo. Maintenance person close all liquid valves. After 5min, withstand the thimble of all checking valves with tools
one by one. If there’s no refrigerant spraying out, close corresponding valve immediately, turn off the unit with remote controller and then
remove the connection pipe.
②
Exit refrigerant recovery function
During refrigerant recovery process, if any one indoor unit receives any remote control signal or refrigerant recovery function has operates
for about 25min, refrigerant recovery function will be exited automatically. If the complete unit is at standby status before refrigerant
recovery, the complete unit will still at standby status after refrigerant recovery. If the complete unit is at ON status, the unit will operate
according to original operation mode.
