Install Instructions

38
External Wiring
H
N
High Voltage
120
V.A.C.
2
4
V
.A.C.
Room
Thermostat
Room
Thermostat
Zone 1
Zone 2
Additional zones
Additional zones may
be added as shown above
To Challenger
Low Voltage Terminal Strip
Transformer
(Power)
Zone
Valve
Zone Valve
7
8
To Challenger
Low Voltage Terminal Strip
H
N
High Voltage
120
V.A.C.
24
V.A.C.
Room
Thermostat
Room
Thermostat
Zone 1
Zone 2
Additional zones
Additional zones may
be added as shown above
Transformer
(Power)
Zone
Valve
Zone Valve
* Isolation relay
7
8
*Use isolation relay on
3-wire zone valve with
non-isolated end switch.
Control can burn out if
isolation relay is not used.
NOTICE:
4 Wire Zone Valve
3 Wire Zone Valve
Fig. 19: Multiple Zone Field Wiring Using Zone Valves