No. Name CN# Meaning
1 Power Supply
CN11 L_in: connect to N-line (208-230V AC input)
CN12 N_in: connect to L-line (208-230V AC input)
2
EEV-A CN4
connect to electric expansion valve
EEV-B CN2
EEV-C CN34
EEV-D CN5
3
S-A CN10
S: connect to indoor unit communication(pin1-pin2: 24VDC Pulse wave;
pin2-pin3: 208-230V AC input)
S-B CN13
S-C CN3
S-D CN15
4 HEAT_D
CN21
connect to chassis heater, 208-230V AC when is ON
CN36
5 4-WAY CN38 connect to 4 way valve, 208-230V AC when is ON.
6 HEAT_Y
CN8
connect to compressor heater, 208-230V AC when is ON
CN20
7 T2B CN28 connect to evaporator coil outlet temperature sensor T2B
8 T3 T4 TP CN26
connect to pipe temp. sensor T3, ambient temp. sensor T4, exhaust
temp. sensor TP
9 OLP TEMP. SENSOR CN30 connect to compressor top temp. sensor (5VDC Pulse wave)
10 H-PRO,L-RPO CN29
connect to high and low pressure swtich(pin1-pin2&pin3-pin4:5VDC
pulse wave)
11 TESTPORT CN24 used for testing
12 / CN27 connect to key board CN1
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