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17 68-0173—3
Fig. 19. Hookup diagram for heat pump application requiring separate Y1 and W1 terminals with cooling changeover.
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
1
2
3
4
5
6
7
7
5
6
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.
CONNECT COOLING CHANGEOVER VALVE TO R8222N1011 AND CONFIGURE PC8900 FOR
CHANGEOVER IN COOLING MODE.
CONNECT G, Y2, E, AUX, AND W2 TERMINALS AS REQUIRED.
SEE VENTILATION INSTRUCTIONS FOR WIRING.
GROUNDING THE GND TERMINAL IS NOT RECOMMENDED.
CONNECTION FOR CM8900A REMOTE COMMUNICATIONS MODULE.
PC8900
1
2
3
4
CO
2
MONITOR
M4487D
R8222N1011
STAGE 1 HEAT RELAY
STAGE 1 COOL RELAY
COOL
CHANGEOVER VALVE
1
3
2
4
6
HUMIDIFIER OR
DEHUMIDIFIER
EQUIPMENT
VENTILATION
EQUIPMENT
COMPRESSOR
MONITOR
3
4
SYSTEM
TRANSFORMER
C7189A REMOTE AIR
TEMPERATURE SENSOR
C7100 DISCHARGE AIR
TEMPERATURE SENSOR
C7089A OUTDOOR AIR
TEMPERATURE SENSOR
2
8
9
8
9