5
Low Voltage
120 Volts
120v
24v
Boiler
Connections
T
1
T
2 3
Hot
Neutral
Zone Valve
120v
24v
To Boiler Connections/Circulator
Hot
Neutral
4 Wire Zone Valve
Motor
End Switch
T
T
Temperature
Differential
Pump/TT
24v
LED
flashing green = calling for heat
solid green = at temperature
red = error
20°
15°
10°
5°
160°
150°
140°
130°
120°
110°
Probe
Temperature
Differential
Pump/TT
24v
LED
flashing green = calling for heat
solid green = at temperature
red = error
20°
15°
10°
5°
160°
150°
140°
130°
120°
110°
Probe
Zone Valve Wiring Diagrams
Wiring for 3 Wire Zone Valve
Wiring for 4 Wire Zone Valve
