20
8.3 PROTECTION FUNCTION INTRODUCTION
(Heat pump only)
Sensor T3 (condenser pipe temperature) and T4 (outdoor ambient temperature
)
When open-circuit, compressor, outdoor fan motor and reverse valve will be OFF.
T3
＞
149°
F
,compressor stop working ; T3
＜
140°
F
,compressor start working.
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.
Discharge temperature protection (optional)
When discharge temp. > 275 °
F
,
the compressor will stop.
When discharge temp. < 194 °
F
,
the compressor will restart.
High pressure protection
(optional)
When high pressure > 638 PSIG, the compressor and outdoor fan motor will stop.
When high pressure < 464 PSIG, the compressor and outdoor fan motor will restart
(3 minutes delay necessary).
Low pressure protection
Low pressure < 21 PSIG, the compressor and outdoor fan motor will stop.
Low pressure > 44 PSIG, the 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.The system will be locked. It will
be restore after power cycle.
8.4 SENSORS
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.
8.2 REVERSING VALVE INTRODUCTION (Heat pump only)
Reversing valve
energizes at the heating conditions, and cut off at the cooling condition.
When the compressor has been running more than 10 minutes in the heating mode,
holding down the FORCE button for at least 6 seconds, the systen enters to the
defrost mode, and then exits the defrost mode normally by itself.
1. T3(condenser pipe temperature) and T4(outdoor ambient temperature, heat pump
only) see TABLE 4
2.T5(compressor discharge temperature) and Tf(IPM radiator fin temperature) see
TABLE 5.
3. Pressure sensor(cooling only) see TABLE 6, Pressure sensor(heat pump only) see
TABLE 7
.
