MAINTENANCE:
Always keep the heater area clear and free from combus- tible materials, gasoline and other flammable vapors and liquids.
Keep the vent areas (slots in the bottom and the top at the front and rear of
heater) clear at all
times.
Visually inspect the pilot flame and
burner periodically during use. The
pilot flame should be blue in color (not yellow) and will extend beyond the thermocouple.
The flame will surround the thermocouple just below the tip, see Figure 5.
A slight yellow flame may occur where the pilot flame and main burner flame meet. The burner should be bright orange (with a slight blue color around the border, a red- orange haze that is visible on the ceramic tile is acceptable) and without a noticeable flame. A blue flame that rolls out at the top of the ceramic tile indicates an accumulation of dust, lint or spider webs inside the casing assembly and main burner assembly. If the pilot is yellow or the burner has a noticeable flame, cleaning may be required. Use the following procedure to inspect the casing assembly and main burner assembly.
It is necessary to periodically check the burner orifice and burner venturi tube to make sure they are clear of insects/ nests or spider webs that may accumulate over time. A clogged tube can lead to a fire.
1Allow heater to thoroughly cool before performing any maintenance.
2Remove disposable 1 lb. cylinder from heater or turn OFF gas supply at remote cylinder valve, and disconnect hose from heater.
3Remove (4) four screws that secure the rear cover to the
Heater.
4Pivot cover outward from bottom. Release from 2 top clips. Set aside.
5Remove (4) four burner retaining screws and fuel line from burner assembly. Remove burner assembly from back of housing.
6Inspect interior of housing for accumulation of dust, lint or spider webs. If necessary, clean interior housing with a vacuum cleaner or apply air pressure. Do not damage any components within the housing assembly when you are cleaning.
7Inspect and clean main burner orifice (threaded into orifice holder). Orifice holder is attached to the burner
assembly venturi with (2) two screws.
8Inspect and clean pilot (mounted to bracket) by using a vacuum or apply air pressure through the holes in the pilot indicated by the arrows in Figure 5.
WARNING: Never use needles, wires, or similar cylin- drical objects to clean the pilot to avoid damaging the calibrated orifice that controls the gas flow.
9Apply air pressure (max. 30 psi.) into ceramic tile of burner assembly and the venturi tube (ref. item #17) to remove dust, lint or spider webs.
10Reassemble main burner orifice holder onto the burner assembly.
11Reinstall burner assembly into the heater housing.
12Reinstall fuel line and check for leaks.
13Install heater back cover.
TROUBLESHOOTING INFORMATION:
If Spark electrode does not produce spark.
CHECK
•Spark electrode broken – replace ODS (Oxygen Depletion Sensor).
•Igniter wire may not be attached to spark electrode.
•Igniter wire damaged – replace.
•Piezo igniter defective – replace control valve.
If Spark electrode produces spark but pilot does not light.
CHECK
•No gas to heater – install disposable cylinder or connect hose and filter where required and turn on valve at remote cylinder.
•“PILOT” position not properly aligned – turn gas control knob to “PILOT” position and depress.
•Pilot is blocked from spider web or dirt – clean pilot, see
MAINTENANCE.
If Pilot flame does not stay lit when knob is released.
CHECK
•Control knob in “PILOT” position not completely depressed or held in long enough to purge air from lines.
•Pilot flame not surrounding thermocouple – clean pilot, see
MAINTENANCE.
•Pilot Assembly defective – replace.
•Tip switch wires disconnected – connect.
If Main burner does not ignite.
CHECK
• Main burner orifice is blocked – clean burner, see MAINTE-
NANCE.
If Heater keeps shutting “OFF” during normal operation.
CHECK
•Pilot is blocked – clean pilot, see MAINTENANCE.
•Provide minimum fresh air opening of 9 square inches (example 3” x 3” opening).
•Tip over switch activated from bumping heater.
•Regulator defective - Replace regulator.
•Internal contamination - Replace control valve and regulator.
•Call Technical Services for additional information.
Mr. Heater Portable Propane Heater | 6 | Operating Instructions and Owner’s Manual |