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Document: GFH-NT 1500-4000 IM 14 DEC 2016
Gas Fired Heater Instructions
©2016 NOVATEC, Inc. All Rights Reserved
9.0 COMBUSTION HIGH TEMPERATURE LIMIT
A combustion high temperature limit switch (CHTL) with display has been supplied with the gas
heater. It requires a manual reset if tripped. The combustion high temperature limit thermocouple
for this device is mounted in the flue outlet duct on the gas heater. The high temperature limit
switch will shut down the gas heater on an over-temperature condition. In normal operation, the
CHTL indicates “
SAFE
”. If the temperature exceeds the high temp limit, the display will indicate the
actual temperature and “
OP1
” on the limit controller will be illuminated. Press the “
RESET
” button
on the high temp limit switch to reset the circuit. If the temperature is below the limit value, the
“
SAFE
” display will return. “
OP1
” is displayed until the “
RESET
” has been pressed.
