Maintenance
5-4
750-437
Q Series Full Modulation
5.7 — Firing Rate Controls
Make sure all connections are tight. Adjust if necessary. Perform a combustion test as explained in Chapter 4,
and readjust the burner if necessary.
5.8 — Burner Mounting Inspection
The seal between the burner flange and furnace front plate must not permit combustion gases to escape.
Periodic inspection is important. Replace the gasket if necessary. Inspect the burner head for signs of
discoloration. A change in the head color paint might indicate gas leakage between the burner flange and the
boiler refractory. If leakage occurs, refer to Chapter 2 for proper sealing procedure.
5.9 — Gas System
5.9.1 — Motorized Main Gas Valves
Should the motorized valve fail to operate, check for voltage at the valve. Make certain that the fuel supply is off
by closing the manual shutoff cock at the gas train inlet prior to testing. The motorized valve is not field
repairable nor should it be disassembled. Replace the motorized valve if it fails to operate. After replacement and
with the fuel supply off, cycle the motorized valve and confirm that it opens and closes. If the valve has a visual
indicator, observe its position for correct operation.
5.9.2 — Solenoid Valves
A slight hum from the solenoid is normal when the coil is energized. Should the valve fail to operate, check that
there is voltage at the valve coil. If there is no voltage at coil, check for loose wiring connections. If there is
proper voltage at the valve coil and the valve still fails to open, replace the coil. Refer to manufacturer's bulletin
for correct procedure in coil replacement.
Should it become necessary to replace the complete valve, be sure that the flow is in the direction of the arrow
on the body.
Test for gas leaks and check valve action several times to ensure proper operation before attempting to relight the
burner.
5.10 — Electrical System
An individual electrical schematic drawing is shipped with each burner.
Troubleshooting instructions for the LMV3 control are included in this manual. See the manufacturer’s manual
for additional information on the LMV3.
Disconnect all power before servicing the valves.
!
Caution
Summary of Contents for ProFire Q Series
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Page 18: ...Introduction 1 8 750 437 Q Series Full Modulation...
Page 28: ...Installation 2 10 750 437 Q Series Full Modulation...
Page 50: ...Operation 3 22 750 437 Q Series Full Modulation...
Page 82: ...Troubleshooting 6 24 750 437 Q Series Full Modulation...
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