Operation
3-4
750-204
Profire D/LND
4. Close the pilot line manual gas valve (if used).
5. Start the burner and at the time of the pilot trial, with just the electrical ignition system energized, the flame
relay should not pull in.
6. Upon completion of a successful test, disconnect the power supply.
7. Reconnect the oil safety shutoff valve and turn on the manual pilot gas valve.
8. Reconnect the power supply and proceed with startup procedures.
3.3 — Gas Pilot Flame Adjustment
The gas pilot flame is regulated by adjusting the pressure setting of the pilot regulator. A normal setting is 3” to
6” W.C. when the pilot is burning. The flame must be sufficient to be proven by the flame detector and ignite the
main flame.
Although it is possible to visibly adjust the size of the pilot flame, obtain a proper DC volt or microamp reading of
the flame signal.
The flame safeguard amplifier has a meter jack for this purpose. At initial startup and during planned mainte-
nance, test the pilot flame signal, pilot turndown, and safety switch lockout.
3.4 — Startup Sequence
The programming control sequences the operation of all controls and components through the starting, ignition,
firing, and shutdown cycle. The burner and control system are in starting condition when:
• The operating and high limit control (temperature or pressure) are below their cutoff setting.
• All power supply switches are closed.
• Power is present at the control panel.
Read the flame safeguard manual and fully understand its contents before attempting to operate this equipment. Fail-
ure to do so may result in serious personal injury or death.
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 without first purging the chamber.
Keep fingers away from the combustion air intake below the damper. The damper is actuated with sufficient force to
cause severe injury. Repeat the procedure until the high fire rate is reached. Always make high and intermediate rate
adjustments when the burner has reached the low fire position. DO NOT disturb the low fire setting.
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Warning
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Warning
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Warning
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