Enerco MH9B owner manual Maintenance

•Fully turn Control Knob to “HI” position to light burner tile. Leave on “HI” position until burner tile turns bright orange.

•After burner tile has turned bright orange, adjust heat output by turning Control Knob to desired position (“LO” or “HI” setting)

•DO NOT OPERATE HEATER UNLESS CONTROL KNOB IS SECURED IN A POSITION MARKED “HI”, “LO” or “PILOT”.

•To shut off heater, shut off propane at supply tank, allow heater to use-up propane in supply line until heater shuts off, then slightly push down and turn Control Knob clockwise to “OFF” position.

•CAUTION: After turning heater off, wire guard will remain hot. Allow to thoroughly cool before storing.

•When not in use, the gas must be turned off at the LP- gas supply cylinder. When the LP-gas supply cylinder is not disconnected from the heater, the heater and the cylinder must be stored outdoors, in a well ventilated space, out of reach of children, and must not be stored in a building, garage or any other enclosed area.

•Indoor storage of the heater is permissible only if the cylinder is disconnected and removed from the heater. Cylinders must be stored outdoors out of the reach of children and must not be stored in a building, garage or any other enclosed area.

MAINTENANCE:

Always keep the heater area clear and free from combustible materials, gasoline and other flammable vapors and liquids.

Keep the vent areas (slots in the bottom and the top at the front 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 2, below. A slight yellow flame may occur where the pilot flame and main burner flame meet. The burner should be bright orange (with a slight

Figure 2

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 wire guard from front of heater by gently bending to remove from holes in front cover.

4Remove (1) burner assembly retaining screw from bottom of the heater.

5Pull burner assembly from front of the heater.

6Inspect interior of casing assembly for accumulation of dust, lint or spider webs. If necessary, clean interior of casing assembly with a vacuum cleaner or apply air pressure. Do not damage any components within casing assembly when you are cleaning.

7Inspect and clean main burner orifice (mounted to pilot bracket with jam nut) by using a vacuum or apply air pressure at orifice opening.

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 2, at left. WARNING: Never use needles, wires, or similar cylindri- cal objects to clean the pilot to avoid damaging the calibrated ruby that controls the gas flow.

9Apply air pressure into ceramic tile of burner assembly and the venturi tube (with cone on end) to remove dust, lint or spider webs.

10Make sure the burner tile assembly is completely seated against the reflector.

11Carefully slide burner assembly back into casing assem- bly making sure to center reflector flange with the casing opening and hold in place while installing burner assembly screw in the bottom of the heater.

12Install wire guard by gently bending and inserting into the (4) holes in the front cover.

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