20
8.5 THERMOSTAT SIGNALS
Table 8-1: Thermostat Signals
Signal
State
Board Function
G
G & W1
G & W & W2
G & Y
G & B & Y
G & B & Y & W1
G & B & Y & W1 & W2
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Blower instant ON
Blower 90 sec. delay OFF
Blower instant ON
Heater bank 1 elec.onstant ON
Heater bank 1 elec.instant OFF
Blower 90 sec. delay OFF
Blower instant ON
Heater 1 instant ON
Heater 2 instant ON
Blower 90 sec. delay OFF
Heater 1 instant OFF
Heater 2 instant OFF
Blower instant ON
Compressor and outdoor fan instant ON
Compressor and outdoor fan instant OFF
Blower fan delay 90 sec. OFF
4-way valve instant ON
Blower instant ON
Compressor and outdoor fan instant ON
Compressor and outdoor fan instant OFF
Blower fan delay 90 sec. OFF
4-way valve instant OFF
4-way valve instant ON
Blower instant ON
Compressor and outdoor fan instant ON
Heater 1 instant ON
4-way valve instant OFF
Blower fan delay 90 sec. OFF
Compressor and outdoor fan instant OFF
Heater 1 instant OFF
4-way valve instant ON
Blower instant ON
Compressor and outdoor fan instant ON
Heater 1 instant ON
Heater 2 instant ON
4-way valve instant OFF
Blower fan delay 90 sec. OFF
Compressor and outdoor fan instant OFF
Heater 1 instant OFF
Heater 2 instant OFF
8.4 MANUAL DEFROST MODE (For HP system only)
When MANUAL DEFROST switch in PCB is set to “1”, system will perform as
above 8.3 description.
When the switch is set to “0”, T3
˘
32°F, compressor keeps working last for
about 40 seconds, after then system turns to the Defrost Mode. By the logic of
8.3 to exit the Defrost Mode.
Caution: Once finishes the manual defrost, please switch the MANUAL
DEFROST in PCB to “1”.
Ending conditions of defrost mode:
The mode will end if one of following conditions is satisfied:
1. The defrosted time lasting for 10 minutes;
2. When JUMP switch is set to “1”, T3 is
64.4°F;
3. When JUMP switch is set to “0”, T3 is
77°F.
When JUMP switch is set to “0”:
Compressor keeps running, when T3 is < 32 °F and last for 30 minutes.
