TriangleTube Smart Line Installation And Maintenance Manual page 21

Installation - Wiring
Typical 4-wire Zone Valve Zoning,
Fig. 16:
without Domestic Priority
Transformer
(Power)
Water Heater
Thermostat
Snap-Set
Water
1
Heater
C 2
Zone
Room
Thermostat
Zone 1
Room
Thermostat
Zone 2
Additional zones
be added as shown above
High Voltage
Low Voltage
Boiler Low Voltage
H N
120
V.A.C.
High Voltage
24
V.A.C.
Zone Valve
Zone Valve
Zone Valve
Additional zones may
Boiler
Thermostat
Terminals
Fig. 17: Typical 3-wire Zone Valve Zoning,
without Domestic Priority
Transformer
(Power)
Water Heater
Thermostat
Snap-Set
Water
Heater
C
Zone
Room
Thermostat
Zone 1
Room
Thermostat
Zone 2
Additional zones
* 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
19
N
H
120
V.A.C.
High Voltage
24
V.A.C.
Zone Valve
1
2
Zone Valve
Zone Valve
Additional zones may
be added as shown above
*Isolation Relay
Boiler
Thermostat
Terminals