Klimaire CSM42H2P16 - Manual (Page 16)

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7.3 PROTECTION FUNCTION INTRODUCTION (Heat pump only
)
Discharge temperature protection
High perssure protection
When high pressure > 638 PSIG, compressor and outdoor fan motor will stop.
When high pressure < 464 PSIG, compressor and outdoor fan motor will restart
(3 minutes delay necessary).
Low pressure protection
Low pressure < 21 PSIG, compressor and outdoor fan motor will stop.
Low pressure > 44 PSIG, compressor and outdoor fan motor will restart
(3 minutes delay necessary).
In stand-by status, the compressor will not start in low pressure protection.
Within 30 mins, if 4 protection cycles occurs, system will restore after power cut-down.
7.4 DEFROST MODE INTRODUCTION
Start-up conditions of defrost mode:
When JUMP switch is set to “1”(See in Fig 11), the mode will start up in either of
the two following conditions:
1. Compressor operating, when T4 is > 28.4 °F and T3 is < 32 °F last for 40 minutes;
2. Compressor operating, when T4 is < 28.4 °F and T3 is < 32 °F last for 50 minutes.
When JUMP switch is set to “0”:
Compressor operating, when T3 is < 32 °F last for 30 minutes.
Shut-down conditions of defrost mode:
The mode will shut down in either of the two following conditions:
1. The defrosted time lasting for 10 minutes;
2. T3 is
≥ 77 °F.
Fig.11 JUMP Switch Location in the PCB Board
JUMP Switch
When discharge temp. > 275 °F, compressor will stop.
When discharge temp. < 194 °F, compressor will restart.
Sensor T3 (condenser pipe temperature) and T4 (outdoor ambient temperature)
When open-circuit, compressor, outdoor fan motor and reverse valve will be OFF.
When T4 < 5 °F, compressor will stop.If the electrical heater kit is installed in the
indoor unit, the outdoor unit would provide a signal to drive up the heater.
When T4 > 10.4 °F, compressor will restart