Smart 40 Indirect Water Heater Manual

661A0300 - Rev B
16
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)
Z
one Valve
Zone Valve
1
2C
Water Heater
T
hermostat
Snap-Set
Water
H
eater
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
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
Water Heater
T
hermostat
Snap-Set
Water
Heater
Z
one
Boiler
Thermostat
Terminals
High Vo l t a g e
Low Vo l t a g e
Boiler Low Voltage
Priority
Relay
Typical 3-wire Zone Valve Zoning,
with Domestic Priority
Typical 4-wire Zone Valve Zoning,
with Domestic Priority
Fig. 14:
Fig. 15:
Installation - Wiring
Smart manual_Smart manual 10/29/14 10:00 AM Page 18