2
Switch action
N.O.
N.C.
2 (HOT)
4 (COM)
3
(COLD)
INSTALLATION
To avoid personal injury and/or property dam-
age, shut off gas and electrical power to the
heating system until installation is complete.
1. Unscrew flame sensor mounting nut from the pilot
burner and remove old flame sensor. Do not discon-
nect wiring from the switch case at this time.
2. Insert replacement flame sensor in pilot burner and
secure with mounting nut. Be sure the new sensing
bulb is in the same position relative to the pilot flame
as the sensor it replaced.
3. Carefully uncoil the capillary until the switch case
reaches its mounting location. Remove mounting
screws and replace old switch case with the new
switch case.
4. Make electrical connections by removing one wire at
a time from the old sensor and transferring it to the
corresponding terminal on the new switch case.
5. Turn on gas and electrical power to the system.
Check the system for proper operation. The pilot
flame will heat the sensor sufficiently to close the
(HOT) contact and allow the main burner to ignite
when the thermostat calls for heat. Upon loss of pilot
flame, the sensor will cool and transfer to the cold
contact, which prevents the gas valve from being
energized.
CAUTION
!
3
24
Terminal location
on switch case
SPECIFICATIONS
Switch Action: SPDT
Electrical Ratings: 3.0 amps @ 30 VAC
1.0 amps @ 120 VAC
0.5 amps @ 240 VAC
Terminals: Three 0.250” spade terminals
Capillary Length: 48 inches
Sensing Bulb Type: 7⁄16-27 threaded nut for mounting
to pilot burner