Manual

15
H
N
High Vo l t a g e
120
V
.A.C.
24
V.A.C.
Room
Thermostat
Zone 1
Additional zones
Additional zones may
be added as shown above
Transformer
(Power)
Zone Valve
Zone Valve
1
2
C
W
ater Heater
Thermostat
Snap-Set
Water
Heater
Z
one
*Isolation Relay
Boiler
Thermostat
Terminals
* Use isolation relay on
3-wire zone valves with
non-isolated end switches.
Transformer and boiler
control can burn out if
isolation relay is not used
Priority
Relay
H
N
High Voltage
120
V.A.C.
24
V
.A.C.
Room
Thermostat
Zone 1
Additional zones
Additional zones may
be added as shown above
Transformer
(
Power)
Zone Valve
Zone Valve
1
2C
W
ater Heater
Thermostat
Snap-Set
W
ater
Heater
Z
one
Boiler
Thermostat
Terminals
High Voltage
Low Voltage
Boiler Low Voltage
Priority
Relay
Typical 3-wire Zone Valve Zoning,
with Domestic Priority
Typical 4-wire Zone Valve Zoning,
with Domestic Priority
Fig. 12:
Fig. 13:
Installation - Wiring