THP-400A, THP-500A and THP-550 Installation and Service Manual
Start-Up Steps
1. Connect power supply. See Rating Information Table on page 5 for electrical requirements.
2. Confirm heater is set up for fuel being supplied. See Rating Information Table on page 5 for proper
gas-inlet pressures.
3. Open fuel-supply valve at tank slowly.
4. Open manual gas valve at heater.
5. Reset Flame-Safety control.
6. Check control settings
high-temperature limit switch: 270° F
low-temperature limit switch: 40° F
7. Turn blower and burner switches to the ON position.
For units equipped with electronic low-temperature limit control:
Allows unit to run for 3-min. If discharge-sensor bulb located in the discharge-air stream does
not reach the 40° F minimum temperature, the unit shuts down, and the low-temperature bulb
glows.
To reset: turn blower and burner switches OFF. Reset the Flame-Safety Control and turn
switches back to ON.
Do not attempt to light the pilot manually.
8. Set discharge air temperature.
9. Set room air temperature.
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