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Appendix A
Board Layout and Schematic
W2
COM
24V
W/W2 Y/Y2
RG
HUM
HOT
SURFACE IGNITOR
CONNECTOR
EAC-ELECTRONIC
AIR CLEANER
TERMINALS
(115-VAC 1 AMP MAX)
115-V
CONNECTORS
(SEE DETAILS ABOVE)
24-V THERMOSTAT
TERMINALS
PRESSURE SWITCH
CONNECTOR
HUM-HUMIDIFIER
TERMINAL
(24-VAC 0.5 AMP MAX)
TRANSFORMER
24-V 
CONNECTORS
SEC-2
SEC-1
3-AMP FUSE
STATUS AND DIAGNOSTIC
LED LIGHTS
AIR CONDITIONING
(A/C) SETUP SWITCH
SETUP SWITCHES
(SW) AND BLOWER
OFF DELAY SETUP
SWITCHES
MODEL PLUG 
COMMUNICATION
CONNECTOR
CONTINUOUS
FAN (CF) SETUP
SWITCHES
MAIN BLOWER
CONTROL WIRE
CONNECTOR
MAIN HARNESS
CONNECTOR
DEHUMIDIFIER (DEHUM) 
CONNECTOR
DEHUMIDIFY ENABLE (DE)
(WHEN PROVIDED)
I2B2 L2P2
I1B1 L1P1
I1B1 L1P1
I2B2 L2P2
P/N HK42FZ003 P/N HK42FZ012
A98351
Control Center
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