Specification

14
Thermal Safety Switches
Models Typical Applications
Our thermal safety switches efficiently detect flue gas
spillage due to a blocked flue, continuous down
drafting or inadequate draft condition. 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.
• 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.
• 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. TCA-1 Thermocouple Adapter
required for 30 millivolt applications. Gold Contacts. 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.
• TCA-1 & TCA-2
Thermocouple Adapter for use on 30 millivolt gas thermocouple
powered valves, for splicing into thermocouple circuit.
• WMO-1
Designed for use with power venting and chimney vented systems
for oil-fired applications. Manual reset.
FTS
GSK
SSK
TCA
WMO