TriangleTube TR Series - Manual (Page 20)

Phase III ®
H H
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
Zone Valve
1
2
C
Water Heater
Thermostat
Snap-Set
Water
Heater
Zone
*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
17
Typical 3-wire Zone Valve Zoning,
without Domestic Priority
Installation - Wiring
H H
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
Zone Valve
1
2
C
Water Heater
Thermostat
Snap-Set
Water
Heater
Zone
Boiler
Thermostat
Terminals
High Voltage
Low Voltage
Boiler Low Voltage
Typical 4-wire Zone Valve Zoning,
without Domestic Priority Fig. 14: Fig. 15: