Pulse Ignition/Battery Installation; Maintenance - Mr. Heater MH12HB Operating Instructions And Owner's Manual

sTOraGe COMParTMenTs
The MH12HB has two storage compartments, with access
doors, on the left side of the heater. The pulse light
button­is­located­in­the­forward­compartment­(Ref.A).­
This compartment can also be used to store small tools or
spare­fuel­filters­(not­included).
Pulse Ignition
Button
B
Figure 5
The­rear­compartment­(Ref.B)­can­be­used­to­store­a­
spare­1#­tank­(not­included).
Pulse IGnITIOn:
The Pulse Ignition Button is located in the front stor‑
age compartment (ref.5).
unscrew the button cap to install the "aa" battery
(included), with positive end toward the button.

MaInTenanCe:

Always keep the heater area clear and free from combus-
tible materials, gasoline and other flammable vapors and
liquids.
Keep­the­vent­areas­(slots­in­the­bottom­and­the­top­at­the­
front­and­rear­of­heater)­clear­at­all­times.
A
Mr. Heater | Portable Propane Heater
Figure 6
Visually­inspect­the­pilot­flame­and­burner­periodically­dur-
ing­use.­The­pilot­flame­should­be­blue­in­color­(not­yellow)­
and­will­extend­beyond­the­thermocouple.­The­flame­will­
surround the thermocouple just below the tip, see Figure 6.
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-
orange­haze­that­is­visible­on­the­ceramic­tile­is­acceptable)­
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
has­a­noticeable­flame,­cleaning­may­be­required.­Use­the­
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.
1 Allow heater to thoroughly cool before performing any
maintenance.
2 Remove disposable 1 lb. cylinder from heater or turn
OFF gas supply at remote cylinder valve, and disconnect
hose from heater.
3­ Remove­(4)­four­screws­that­secure­the­rear­cover­to­the­
Heater.
4 Pivot cover outward from bottom. Release from 2 top
clips. Set aside.
5­ Remove­(4)­four­burner­retaining­screws­and­fuel­line­
from burner assembly. Remove burner assembly from
back of housing.
6 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.
7 Inspect and clean main burner orifice (threaded into
orifice­holder).­Orifice­holder­is­attached­to­the­burner­
assembly­venturi­with­(2)­two­screws.
8­ Inspect­and­clean­pilot­(mounted­to­bracket)­by­using­a­
vacuum or apply air pressure through the holes in the
pilot indicated by the arrows in Figure 6.
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.
E- 6
Operating­Instructions­and­Owner's­Manual