Haier HB4800VD1M22-P Service Manual page 16

A MEANS OF STRAIN RELIEF TO PROTECT THE ENTRY BLOCK WIRE CONNECTION.
When an optional electric heat kit is installed refer to the electrical requirements for that kit. The
ampacity and over-current protection shown above is onl y for "HB" air handlers installed without
.
a heat kit
Electric control function for air handlers
C1
C2
C3
Port definition:
C1, C2: power input port, 24VAC;
C3: control signal input port, 24V;
P1, P2, P3: fan motor control port --- P1 is COM port, P3 is normal OFF, P2 is normal OPEN;
K1: fan motor relay
Function description
1. K1 will open 15 seconds later after there is 24V signal from C3;
2. K1 will open 30 seconds later after there is no signal from C3;
3. AC contactor control the electric heater solely.
Connecte P1 with netural wire of fan motor, connect normal OPEN port P2 with power input
port of AC contactor, supply P1 the power of fan motor when there is signal from C3. connect
normal OFF port P3 with power output port of AC contactor, to ensure the fan motor work
whenever there is or is not control signal during heater woring.
16
Central Air Conditioning Model: Air Handler, HB-D series
P3
P1
K1
P2