Profire V Burner Chapter 2
750-177 2-23
If a high or low gas pressure condition occurs while firing on gas, the burner shuts down as in Automatic
Shutdown. Condition must be corrected and the respective gas pressure switch manually reset before the
burner will fire again on gas.
Should a starting failure occur for any reason, combustible fumes may fill the combustion chamber. Never
attempt to re-light the burner under these conditions. The combustion chamber must first be purged before
re-lighting.
Keep fingers away from the combustion air intake below the damper. The damper is actuated with sufficient
force to cause severe injury. Always make high and intermediate rate adjustments when the burner has
reached low fire position. Do not disturb the low fire setting.
STARTUP AND OPERATING
Gas Burners
A gas valve leak test must be performed on the automatic safety shutoff valves located in the main gas train
prior to any initial commissioning or subsequent maintenance of the burner and gas train systems, where
automatic valve proving systems interlocked with the main burner safety control are not provided. This test
should be performed periodically to ensure no leakage of valves in their closed or de-energized position.
The unit should be taken out of service if the unit fails any of the following tests. Any defective part must be
replaced prior to putting the equipment back into service.
FAILURE TO FOLLOW THIS PROCEDURE MAY RESULT IN EXPLOSION, FIRE, PROPERTY DAMAGE, AND
PERSONAL INJURY. THIS PROCEDURE MUST BE PERFORMED ONLY BY AUTHORIZED AND QUALIFIED
PERSONNEL.
1. Close the main and pilot gas cocks.
2. Make sure the ON-OFF switch is in the “OFF” position and the fuel selector switch is turned to “GAS.”
3. Actuate the manual reset button of the flame safeguard control to close the safety switch contacts.
4. Set the MANUAL-AUTO switch in the “MANUAL” position.
5. Set the manual potentiometer in the low fire position.
6. Open the gas pilot cock.
7. Set the ON-OFF switch to “ON.” The burner will start and pre-purge. After pre-purge, the ignitiontransformer and the gas pilot
solenoid are energized. Before proceeding, conduct electrical interferenceand pilot turndown tests if not previously done (see
Section 3.2).
8. On initial startup it is recommended that the main gas shutoff cock remains closed until the programmerhas cycled through pre-
purge and pilot sequence. Then determine that the main gas valve opens. Whenthis is confirmed, turn the burner switch “OFF”
and let the programmer finish its cycle.
9. Check to see that the gas valve has closed tightly. If ignition does not occur, turn the burner switch“OFF” and allow the program-
mer to recycle for a new ignition trial.
10. Turn the burner “ON” and after pilot ignition when the flame relay pulls in, the slow opening, motorized,main gas valve is ener-
gized. The main flame should ignite at this time. The gas valve and air dampercontinue advancing until high fire is reached.
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