9. Start-Up
PNEG-308 Purafire 29
Burner Operation
1. Set the operating thermostat (optional) to its highest setting.
2. Verify that inlet and discharge air are not restricted.
3. Place the selector switch located on the electrical control enclosure to the “ON” position.
NOTE: The ignitor warm-up cycle is approximately 10 seconds prior to the automatic gas valve being
energized. The automatic gas valve will remain energized for a maximum of 6 seconds during
the ignition cycle. If a burner fails to ignite, the automatic gas valve will close. However, the
blower will remain ON, purging the heater of any gas vapors. After 8 seconds of purging, the
burner will again try for ignition. If the burner fails to ignite on the third try for ignition, the
blower will purge the heater of any gas vapors, shut down and go into a lockout mode. The
heater must be turned OFF for 3 seconds and then turned back ON to reset the lockout mode.
Pre-purging of the gas line is required to avoid nuisance lockout.
4. Verify the burner operation by checking that the flame is evenly spread.
5. Place the selector switch to the “OFF” position.
6. Repeat steps 3 through 5 several times to ensure proper ignition and burner operation.
7. Depending on when the heater is to be placed in service, follow the LIGHTING and/or
SHUT DOWN instructions as applicable.
Adjustment of Heater Input (Optional for C80M)
The model C80M is supplied with a manual modulating valve on the outlet of the automatic gas valve,
prior to the orifice elbow, to permit the adjustment of the heating input between the minimum of
40000 BTU/Hr and the maximum input of 80000 BTU/Hr.
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