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7. 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
HYDROMAX™
CIRCULATOR
COIL
2
3
1
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
L1
ZR
Typical Oil Burner (Non-Priority)
AQUASTAT
3-Wire
ZONE VALVE
24VAC
END
SWITCH
TRANSFORMER
L1
L2
AQUASTAT
Multi-Zone Control
HYDROMAX™
CIRCULATOR
OR ZONE VALVE
DHW ZONE
L1
L2
TO BOILER
X
X
AQUASTAT
HYDROMAX™
CIRCULATOR
COIL
2
3
1
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
L1
L2
4-Wire
AQUASTAT
Boiler Control Input
HYDROMAX™
CIRCULATOR
OR ZONE VALVE
DHW ZONE
AQUASTAT
HYDROMAX™
CIRCULATOR
COIL
2
3
1
4
6
5
HONEYWELL
R4222D 1013
OR EQUIVALENT
DPDT RELAY
T
C1
L2
L1
T
24V Thermostat Input (Priority)
Boiler Controls
Zone Valves
Universal Sensor Kit
Other Applications
AQUASTAT
SENSOR BULB
(REMOVE)
BOILER CONTROL
EXTENSION
CABLE
PLUG
UNIVERSAL SENSOR
IN SENSOR WELL
HYDROMAX
BOILER
DHW
Installing Universal 10K Ohm Sensor Kit
HYDROMAX models with a mechanical aquastat
include a universal temperature sensor kit allowing
HYDROMAX to be used with any boiler control featuring
a standard “10K” DHW thermisor input (10,000 Ohms at
77° F). When installed, domestic water temperature is
regulated by the boiler and the HYDROMAX aquastat is
not used.
1. Unscrew and remove copper sensor bulb from
sensor well.
2. Insert Universal Sensor to bottom of sensor well.
3. Plug Universal Sensor into Extension cable.
4. Connect wire leads to DHW input terminals on
boiler control.
