Maintenance - Mr. Heater MH9BX Operating Instructions And Owner's Manual

NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
6. Turn Control Knob counterclockwise to
"PILOT" position and depress to light.
See Figure 3. This may take longer
to purge air from the supply hose
depending on the length of the hose
being used.
7. If pilot does not light, hold down for
approximately 30 seconds; release and
depress again. Repeat until pilot lights.
8. After pilot lights, hold down for 30
-60 seconds and then release knob.
Knob should return to fully extended
position. See Figure 4. The pilot should
remain lit.
9. To operate heater slightly depress knob
and gently turn to lock in the "HI"
position to light burner tile. Leave on
"HI" position until burner tile turns
bright orange.
10. After burner tile has turned bright
orange, adjust heat output by turning
Control Knob to desired position ("LO"
or "HI" setting).
Shutdown Instructions
1. 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.
• When not in use, the gas must
be turned off at the LP-gas supply
cylinder. As stated before allow heater
to use up propane in supply line until
heater shuts off. 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 top of the 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 to 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 housing assembly and
main burner assembly. If the pilot is
yellow or the burner has a noticeable
flame, cleaning may be required.
• It is necessary to periodically check the
burner orifice and burner venturi to
make sure that they are clear of things
such as insect nests and spider webs
that may accumulate over time. A
clogged tube can lead to a fire.
• Use the following procedure to inspect
the casing assembly and main burner
assembly.
Cleaning Instructions (Refer to
Exploded Parts on Page 8):
IMPOR TANT: Allow heater to
thoroughly cool before performing any
maintenance.
1. Remove disposable 1 lb. cylinder
from heater or turn OFF gas supply at
remote cylinder valve, and disconnect
hose from heater.
2. Remove (4) four screws that secure the
rear cover (ref. # 7) to the Heater.
3. Pivot cover outward from bottom.
Release from 2 top clips. Set aside.
4. Remove (4) four burner retaining
screws and fuel line from burner
assembly. Remove burner assembly
(ref. # 16) from back of housing.
5. Inspect 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.
6. Inspect and clean main burner orifice
(threaded into orifice holder). Orifice
holder (ref.# 19) is attached to the
burner assembly venturi with (2) two
screws.
Mr. Heater | Portable Buddy Radiant Heater
or similar cylindrical objects to clean the
pilot to avoid damaging the calibrated
ruby that controls the gas flow through
the pilot orifice.
7. Inspect 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.
8. Apply air pressure (max. 30 psi.) into
ceramic tile of burner assembly and
the venturi tube to remove dust, lint or
spider webs.
9. Reassemble main burner orifice holder
onto the burner assembly.
10. Reinstall burner assembly into the
heater housing.
1 1. Reinstall fuel line and check for leaks.
12. Install heater back cover.
13. The exterior of the heater can be
cleaned with a damp cloth. Avoid the
direct use of any aerosol or spray-on
cleaners. Do not use abrasive materials
or cleaners on the decals or control
knob.
OFFSEASON
• If the heater is to left "OFF" for a
considerable period of time, the
propane (LP) gas supply to the heater
should be turned off as close to the
gas source as possible. In the case
of portable use, the gas should be
turned off at the propane (LP) gas
supply cylinder.
• If the heater is put into storage, make
sure to disconnect the propane (LP)
gas cylinder.
6
Operating Instructions and Owner's Manual
Figure 5
WARNING: Never use needles, wires