4
f
o
3
e
g
a
P
2 rev A
May 2008
9
0
9
1
#
I
T
E
FWT–3H
Single-Gang
Switch Box
(Customer Supplied)
3 ft. (approx.)
Cap
Hydronic Tubing Run
Extension Cable
Temperature
Sensor
Conduit for
temperature sensor /
extension cable
(Customer Supplied)
To 24VAC Class 2
Power supply
(Customer Supplied)
To controlled device
(contactor, zone valve, etc.)
Figure 1
FWT-3H Electronic Assembly/Temperature Sensor Mounting
Cap
Extension Cable
Conduit
FWT-3H Thermostat
(rear view)
Temperature Sensor
Jacketed Extension Cable
RELAY SENSOR 24 VAC
SV
Solenoid valve, pump contactor,
or boiler control
24 VAC
power source
Figure 2
FWT-3H Wiring Diagram
