Mr. Heater MH125LP - Manuel (Page 5)

8. Turn the gas valve knob counter-clockwise to the “ON”
position (see Fig. 1). The burner will light. DO NOT
operate the heater in any other than the full “ON”
position.
9. IMPORTANT: DO NOT attempt to adjust the main
burner input using the main gas supply valve, for
this may cause the pilot and thermocouple to shut
down the burner (Fig. 2).
Shut-down instructions:
To turn the heater OFF,
• For short periods of time, turn the main burner off by
rotating the gas valve knob clockwise to the “PILOT”
position.
• For extended periods of non use, turn the appliance
completely off by rotating the gas valve knob clockwise
to the “PILOT” position, depress the knob slightly, then
rotate the knob fully clockwise to the “OFF” position.
(Note: For Model 120L, also turn off the gas supply
cylinder.)
Pilot burner adjustment:
1. Remove the pilot adjustment cap. The pilot adjustment
cap is a slotted screw located in front of the “Pilot”
designation stamped on top of valve body just below
the gas valve knob.
2. Adjust the pilot key to provide properly sized flame.
Rotate the key “clockwise” to decrease or “counter-
clockwise” to increase flame.
3. Replace the pilot adjustment cap.
MAINTENANCE INSTRUCTIONS
This heater (including hose and regulator assembly if applicable)
must be inspected before each use. If the hose for the Model
120L shows evidence of excessive abrasion or wear, or if the hose
is cut, it must be replaced prior to the heater being put into
operation. The replacement hose assembly shall be that specified
by the manufacturer. See the parts list.
The appliance area must be kept free and clear of combustible
materials, gasoline and other flammable vapors and liquids at all
times.
The flow of combustion and ventilation air must not be
obstructed.
Cleaning the heater:
Periodically, the heater must be cleaned of all dirt and dust
particles.
DANGER
DO NOT ATTEMPT TO CLEAN THE HEATER
WHILE IT IS OPERATING OR WHILE IT IS STILL
HOT.
Turn the heater off and wait until it has completely cooled (at
least 20minutes) before cleaning.
Clean the outside of the heater using a damp cloth. DO NOT
clean the heater by spraying water on it. Wipe the outside of the
heater off with a dry cloth after cleaning.
Clean the inside of the heater using compressed air. Blow air
back and forth along all inside surfaces until all dust has been
dislodged.
Clean the orifice of each burner with a #69 drill bit (for LP-Gas).
Clean the orifice manually (by hand) – DO NOT use power drill.
Clean the thermocouple lead.
DO NOT operate this heater if any part has been under
water. Call a qualified service person to inspect the appliance
and to replace any part of the control system or gas control valve
which has been under water.
This heater must be inspected at least annually by a qualified
service person.
WARNING
Do not exceed ½ PSI gas pressure to
appliance gas control valve.
5 Operating Instructions and Owner’s Manual Enerco Group, Inc. | Gas-Fired Infra-Red Portable Construction Heater