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External Wiring
Fig. 20: Field Wiring with Zone Circulators
Fig. 21: Typical Zone Relay Panel Wiring
L2 ZC
N
H
120 VAC
Low Voltage
120
VAC
H
N
R
C
L1
X1
X2
PR
PR
7
8
To Challenger
Terminal Strip
Thermostat
Honeywell
zone 1
R845A
Relay
T
T
T
T
1
2
4
3
5
Circulator
Zone 1
Thermostat
zone 2
T
T
1
2
4
3
5
Circulator
Zone 2
Additional zones may be
added as shown above
Low Voltage
Thermostat
Thermostat
Zone 2
Zone 1
T1 T1
T2
T2
C1
C1
C2
C2
Zone 1
Zone 2
Circulator
Circulator
39
6
6
8
7
To Challenger
Terminal Strip
Thermostat
Zone 3
T3
T3
C3
C3
Zone 3
Circulator
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