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15 68-0173—3
Fig. 17. Hookup diagram of 3-stage heat/2-stage cool heat pump system.
S1
S
T1
T
OUT
OUT
LED
O/B
G
Y2
Y1/W1
E
AUX
W2
CO
2
L
1
2
3
4
GND
C
R
RH
HUM
HUM
VNT
VNT
W8900B
L1
(HOT)
L2
1
2
CHANGEOVER
RELAY
AUXILIARY
HEAT RELAY
STAGE 2
COMPRESSOR
PC8900
1
2
3
4
CO
2
MONITOR
1
2
3
3
4
5
6
7
8
8
5
6
7
4
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
JUMPER R TO RH.
DURING INSTALLER SETUP, CONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING MODE
(HUMIDIFIER) OR COOLING MODE (DEHUMIDIFIER).
W8900 ALLOWS CONNECTION OF A CO MONITOR WITH UNCOMMITTED CONTACTS.
CONFIGURE PC8900 FOR CHANGEOVER IN HEATING MODE OR COOLING MODE.
JUMPER Y2 AND W2 TERMINALS.
IF NO EMERGENCY HEAT RELAY, FIELD INSTALL JUMPER E TO AUX.
SEE VENTILATION INSTRUCTIONS FOR WIRING.
GROUNDING THE GND TERMINAL IS NOT RECOMMENDED.
CONNECTION FOR CM8900A REMOTE COMMUNICATIONS MODULE.
M4485D
FAN RELAY
STAGE 1
COMPRESSOR
COMPRESSOR
MONITOR
EMERGENCY
HEAT RELAY
HUMIDIFIER OR
DEHUMIDIFIER
EQUIPMENT
VENTILATION
EQUIPMENT
C7189A REMOTE AIR
TEMPERATURE SENSOR
C7100 DISCHARGE AIR
TEMPERATURE SENSOR
C7089A OUTDOOR AIR
TEMPERATURE SENSOR
SYSTEM
TRANSFORMER
2
9
10
9
10