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COMBUSTION
AIR INDUCER
CONNECTOR
DIAGNOSTIC
PUSH BUTTON
DIP SWITCHES
OUTDOOR AIR
TERMINALS
DISCHARGE AIR
TERMINALS
FACTORY TEST
HEADER PINS.
FACTORY USE ONLY.
E43 OUTDOOR
E44 INDOOR
RS-BUS LINK (E3, future use)
I+ = DATA HIGH CONNECTION
I - = DATA LOW CONNECTION
RS-BUS OUTDOOR (E43)
R = 24VAC
I + = DATA HIGH CONNECTION
I - = DATA LOW CONNECTION
C = 24VAXC COMMON
RS-BUS INDOOR (E44)
R = 24VAC
I + = DATA HIGH CONNECTION
I - = DATA LOW CONNECTION
C = 24VAXC COMMON
1/4" QUICK CONNECT TERMINALS
HUM = 120 VAC OUTPUT TO HUMIDIFIER
XMFR = 120 VAC OUTPUT TO TRANSFORMER
LI = 120 VAC INPUT TO CONTROL
CIRC = 120 VAC OUTPUT TO CIRCULATING BLOWER
EAC = 120 VAC OUTPUT TO ELECTRICAL AIR CLEANER
NEUTRALS = 120 VAC NEUTRAL
508364-01
FLAME
SENSE
SENSOR
SENSOR
E3
E43
Figure 56. Integrated Control
7-SEGMENT
DIAGNOSTIC LED
E44
THERMOSTAT CONNECTIONS (E7)
DS = DEHUMIDIFICATION SIGNAL
W2 = HEAT DEMAND FROM 2ND STAGE T/STAT
W1 = HEAT DEMAND FROM 1ST STAGE T/STAT
R = CLASS 2 VOLTAGE TO THERMOSTAT
G = MANUAL FAN FROM THERMOSTAT
C = THERMOSTAT SIGNAL GROUNCONNECTED TO
TRANSFORMER GRD (TR) & CHASIS GROUND (GRD)
Y1 = THERMOSTAT 1ST STAGE COOL SIGNAL
Y2 = THERMOSTAT 2ND STAGE COOL SIGNAL
O = THERMOSTAT SIGNAL TO HEAT PUMP REVERSING
VALVE
H = 24V HUMIDIFIER OUTPUT. DO NOT CONNECT TO
COMFORT SYNC® THERMOSTAT
L
= USE ONLY WITH A COMMUNICATING THERMOSTAT
AND A NON-COMMUNICATING OUTDOOR UNIT
DH = DEHUMIDIFICATION OUTPUT COMMUNICATING
THERMOSTAT ONLY
Issue 2346
NEUTRAL
TERMINALS
IGNITOR
CONNECTOR
LINE VOLTAGE
TERMINALS
HUM
EAC
INDOOR
BLOWER
CONNECTOR
W915 Y1 TO Y2
W951 R TO O
W914 R TO DS
W915
W951
L - use only with
W914
communicating T'stat and
non-communicating outdoor
unit.
Page 41 of 74
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