Specification

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Venting
Model
Typical Applications
FTS-4 &
FTS-6
Designed for use on large gas furnaces and boilers. Can be
mounted on Draft Hood or double-acting Barometric Draft
Control (both brackets included). Manual reset.
SSK-1 &
SSK-3
Kit form of GSK-3 or GSK-4 generally used on millivolt
water heaters. Can also be used with 24 VAC gas furnaces
or boilers. Kit includes (2) GSK style Thermal Safety
Switches, (1) 12-gauge Jumper Wire and (1) 6 ft. length
12-gauge lead wire. SSK-3 switches not supplied with switch
enclosures. TCA-1 Thermocouple Adapter required for 30
millivolt applications.
WMO-1
Designed for use with power venting and chimney vented
systems for oil-fired applications. Manual reset.
GSK-160A &
GSK-250M
The GSK-160A is designed for use on draft induced
furnaces. Activates at 160°F. Silver Contacts. Auto reset. The
GSK-250M is designed for use on steam boilers. Activates at
250°F. Silver Contacts. Manual reset.
GSK-3 &
GSK-4
Designed for use on residential and light commercial millivolt
or 24 VAC gas furnaces, boilers and water heaters. Generally
used with sidewall venting applications.
LS-140A,
LS-550A
Installation of a high temperature vent limit switch is
recommended for LP and Natural gas fired power vented and
natural draft water heaters. This device is installed to limit the
vent temperature in either plastic pipe (140º F temperature
limit) or B vent installations (550º F temperature limit) caused
by scaled up tanks and/or inadequate venting.
TCA
Note: For 30 millivolt applications (residential water heaters),
a thermocouple adapter is required to connect the GSK.
The TCA is used to splice into the thermocouple circuit. The
TCA-1 has standard threads.
FTS
Our thermal safety switches detect flue gas spillage due to a blocked flue. With the safety switch wired in series with
the burner circuit, the switch will de-energize the system’s burner or burner control once it senses the spillage of hot
flue gases. Available for gas-fired and oil-fired applications.
GSK
SSK
TCA
WMO
Thermal Safety Switches
LS