Haier AC142ACBEA Service Manual page 49

CN4——input port 3 of transformer (1-2、14VAC，3-4、12VAC)
CN5——input control, connecting port to wired controller: CONTROLLER（1.
power supply: 12VAC, 2. power supply: 0VAC, 3. communication: COMM.）
CN6 — — input control, ambient temp.-coil temp. sensor connecting port:
ROOM/PIPE（1-2、ROOM，3-4、PIPE。 ）
CN7——control external load, fresh air control: FRESH（1. blank, 2. power
supply 0VDC, 3. control output: 12VDC.）
CN8——input signal: FREEZE（no use）
CN9——input control（no use）
CN10——communication with fixed frequency single outdoor unit: (0~12VDC)
CN11——input signal, door switch: DOOR（1-2 short circuit is normal, cut off
P8 output）
CN12——input signal, external alarm input: ALARM（1-3 short circuit is normal,
if cut off, air conditioner stops work.）
CN13——input signal, wiring port of remote receiver board: RECEIVE BOARD
（1. power supply 5VDC, 2. power supply 0VDC, 3. remote signal, 4. signal output of
running lamp 0VDC, 5. signal output of timer lamp 0VDC,6. signal output of power
lamp 0VDC, 7. signal output of water pump running lamp 0VDC）
CN14——control external load, elevating function （1. signal of door switch
close, 2. output of elevating direction control 0VDC, 3. output of elevating power
control 0VDC, 4. power supply 12VDC）
CN15——input signal, water level of float switch （1-3 short circuit is normal, cut