Instructions / Assembly

-5-
1. Plumb the circulator or zone valve on the BOILER SUPPLY line.
2. Pipe the BOILER RETURN connection to the boiler return line.
Be sure the return line is NOT plumbed to the
suction side of any heating circulators. This
may require moving the heating circulator off the boiler tapping on
packaged boilers. Failure to do so will result in overheating and
tank damage when the heating system is in operation.
3. Install a weighted flow check on the boiler return line. This is not
necessary on systems utilizing a zone valve to control the water
heater temperature.
4. After completing the boiler piping, slowly open the boiler fill valve
and pressurize the water heater loop. Check for leaks and repair as
necessary. Proceed to the appropriate wiring section in this manual.
EXPLOSION HAZARD. Do not install to a high
pressure steam boiler (greater than 15 psig).
Installation - Boiler Piping
AQUASTAT
3-Wire
ZONE VALVE
24VAC
END
SWITCH
TRANSFORMER
L1L2
AQUASTAT
ZONE VALVE
MOTOR
24VAC
END
SWITCH
TRANSFORMER
L1L2
4-Wire
Zone Valves
Other Applications
AQUASTAT
Multi-Zone Control
BOILERMATE
CIRCULATOR
OR ZONE VALVE
DHW ZONE
L1L2
TO BOILER
XX
AQUASTAT
Boiler Control Input
BOILERMATE
CIRCULATOR
OR ZONE VALVE
DHW ZONE
AQUASTAT
BOILERMATE
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
BOILERMATE
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
BOILERMATE
CIRCULATOR
COIL
2
31
4 6
5
HONEYWELL
R4222D 1013
OR EQUIVALENT
DPDT RELAY
T
C1
L2
L1
T
24V Thermostat Input (Priority)
Mechanical Aquastat
Note: if your application is not shown,
contact AMTROL Technical Support at 401.535.1216.