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Mechanical Aquastat Wiring Diagrams
Common wiring diagrams are shown below. Select the appropriate diagram for the application. Diagrams are popular examples only.
If your application is not shown, contact AMTROL Technical Support at 401.535.1216.
AQUASTAT
CIRCULATOR
COIL
2
31
4 6
5
HONEYWELL
R4222D 1013
OR EQUIVALENT
DPDT RELAY
WHEN NO “ZR” TERMINAL IS AVAILABLE
GO TO THE SUPPLY SIDE OF THE HI LIMIT
L1
L2
ZR
Typical Oil Burner (Non-Priority)
AQUASTAT
3-Wire
ZONE VALVE
24VAC
END
SWITCH
TRANSFORMER
L1L2
AQUASTAT
Multi-Zone Control
CIRCULATOR
OR ZONE VALVE
DHW ZONE
L1L2
TO BOILER
XX
AQUASTAT
CIRCULATOR
COIL
2
31
4 6
5
HONEYWELL
R4222D 1013
OR EQUIVALENT
DPDT RELAY
Z
W
L1
L2
B
Typical Gas Valves (Non-Priority)
AQUASTAT
ZONE VALVE
MOTOR
24VAC
END
SWITCH
TRANSFORMER
L1L2
4-Wire
AQUASTAT
Boiler Control Input
CIRCULATOR
OR ZONE VALVE
DHW ZONE
AQUASTAT
CIRCULATOR
COIL
2
31
4 6
5
HONEYWELL
R4222D 1013
OR EQUIVALENT
DPDT RELAY
T
C1
L2
L1
T
24V Thermostat Input (Priority)
Boiler Controls
Zone Valves
Other Applications