750-204
Profire D/LND
3-1
CHAPTER 3 Operation
3.1 — Preparations for Starting
When the installation is complete and all electrical, fuel, water and vent stack connections are made, make cer-
tain these connections are tight. The operator should become familiar with the burner, boiler controls, and com-
ponents. Adjustment procedures given in Chapter 4 should be reviewed prior to firing. The wiring diagram should
also be studied along with the operating sequence of the burner programmer.
Read and understand starting instructions before attempting to operate the burner. Before attempting to start the
burner, the following checks must be made:
Component Description
Burner Check the electrical power supply to the burner in accordance with the nameplate voltage
on all motors and the control circuit. Check the direction or rotation of the motors. Open
the housing to check the electrode setting (refer to Chapter 5).
Check the gas pilot pressure at the pilot gas regulator. The normal setting is 3” to 5” W.C.
For protection in shipment, the flame safeguard control chassis is shipped unmounted.
Check all screw connections before attaching the flame safeguard chassis to the base.
Screws must be secure to assure low resistance connections. The relay chassis is
mounted on the sub-base with a screw which, when tightened, completes the connection
between the sub-base and chassis contacts. Press the manual reset button to be sure
safety switch contacts are closed.
Check the control linkage for proper movement of the air volume damper and fuel meter-
ing components. This can be done by loosening the linkage at the actuator level and
manipulating it by hand.
Check the air shutter and adjust the low fire setting.
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