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TZ-4 TOTALZONE® ZONE CONTROL PANEL
68-0259-1 6
Fig. 4. PC8900 with W8900A,C Thermostat wiring.
Heat Pump Thermostats
Select a heat pump thermostat from Table 1. If the thermostat
selected has a separate Y1 and W1 wire, as shown in Fig. 5,
leave the zone O/B thermostat type jumper on the TZ-4
disconnected, and wire as shown in Fig. 5.
If the PC8900/W8900 /Thermostat is used in a heat pump
application, use the W8900A, not the W8900B, and wire as
shown in Fig. 4.
M20508B
W8900A/C IS RECOMMEDED FOR CONVENTIONAL AND HEAT PUMP APPLICATIONS. THE W8900B CANNOT
SWITCH THE PANEL TO EMERGENCY HEAT.
LEAVE O/B JUMPER ON TZ-4 DISCONNECTED.
TZ-4 THERMOSTAT
CONNECTORS
1
2
1
S1
S
T1
T
OUT
OUT
LED
G
Y2
Y1
W1
W2
1
2
3
4
GND
C
R
RH
RC
HUM
HUM
VNT
VNT
W8900A,C
PC8900
CO
2
1234
2
24 VAC
120 VAC