750-437
Q Series Full Modulation
4-1
CHAPTER 4
Adjustments
4.1 — Overview
While each burner is tested at the factory for correct operation before shipment, variable conditions such as
burning characteristics of the fuel used and operating load conditions may require further adjustment after
installation to assure maximum operating efficiency.
Prior to placing the burner and heat exchanger into initial service, a complete inspection should be made of all
controls, connecting piping, wiring and all fastenings such as nuts, bolts and setscrews to be sure that no
damage or misadjustments occurred during shipping and installation.
A combustion efficiency analysis made during the initial start-up will help to determine what additional
adjustments are required in a particular installation.
4.2 — Gas System
4.2.1 — Honeywell V48A Gas Valve Adjustment
1.
The bleed valve screw should be open one (1) turn counterclockwise from the fully closed position as a start-
ing point.
2.
Adjust the bleed valve in 1/4 turn counterclockwise increments until the V48A gas valve opens at the desired
opening speed for a smooth main flame ignition.
3.
The burner should be cycled between adjustments.
4.2.2 — Gas Pressure
Gas must be supplied at a pressure high enough to overcome the pressure loss in the burner gas train and
furnace pressure while running at full input. Refer to nameplate inside control panel for gas pressure
requirements at train inlet and manifold. The pressures listed are based on nominal 1000 Btu/cu ft. natural gas
at elevations up to 2000 feet above sea level.
NOTE: If The gas train components ship loose, the bleed valve will need to be installed and adjusted in the field.
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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