11
3. The heater
has a loud
rumbling
sound.
4. Burner motor
comes on,
but the heater
won’t ignite.
• Air damper setting
• Dirt on burner blower wheel
• Flue pipe setup or flue pipe
restrictions
• Gas manifold pressure
• Burner orifice size
• Restrict heat exchanger
• Fuel pressure or volume
• Air inlet damper adjustment
• Ignition electrode
• Electronic igniter
• Rough setting at 6. Minor adjustments from the rough settings can be made to
achieve a smooth sounding burner with no soot from the flue pipe.
• Clean the burner blower wheel with a small brush.
• Refer to the flue pipe chart in this manual. Check flue for restriction.
• Use a low pressure gauge (0-15 inches of water column) with 1/8” NPT inlet.
Install gauge in the pressure tap port located on the output side of the gas
valve. Run the heater. Adjust the pressure by turning the pressure adjusting
screw (located on the input side top of the gas valve) counter clockwise until
the gauge reads 3” W.C.(Propane) & 3.2”W.C.(Nat Gas). Refer to pipe sizing
charts in the Heat Wagon Engineering guide, Heater requires 9-14” W.C. inlet
pressure. Ensure proper purge procedure (see fuel supply installation).
• For propane, use size .201.
For natural gas, use size .261.
• Remove flue pipe and use a flashlight to inspect the inside of the heat
exchanger. The access panel is located in the front panel which is welded to
the flue pipe. Clean the inside of the heat exchanger.
• Use a low pressure gauge (0-15 inches of water column) with 1/8” NPT inlet.
Install gauge in the pressure tap port located on the output side of the gas
valve. Run the heater. Adjust the pressure by turning the pressure adjusting
screw (located on the input side top of the gas valve) counter clockwise until
the gauge reads 3” W.C.(Propane) & 3.2”W.C.(Nat Gas). Refer to pipe sizing
charts in the Heat Wagon Engineering Guide. Heater requires 9-14” W.C. inlet
pressure.
• Rough setting at 4.5. Minor adjustments from the rough settings can be made
to achieve a smooth sounding burner with no soot from the flue pipe.
• Clean with fine sandpaper. Make sure it is free from buildup or cracks.
• Turn off the gas valve, turn on the burner. Use insulated pliers to hold the
ignition wire and short it to ground. Pull the wire away from ground slowly. A
rainbow colored arc should travel between the wire and the ground at a
distance of 3/8 of an inch for a duration of 4-5 seconds.
VG175 TROUBLESHOOTING
Symptom Possible Causes
Possible Solutions
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