10
Mr. Heater | Unvented Natural Gas Fired Room Heater
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!
Lighting Instructions
1. STOP!
Read the all safety information
included with and on the side of
heater.
2. Check that gas supply to heater is on.
3. Push in gas control knob and slightly
turn clockwise
to the OFF position
See Figure 16.
Note:
Knob cannot be turned from
PILOT to OFF unless knob is pushed in
slightly. Do not force.
4. Wait five (5) minutes to clear out any
gas. Then smell for gas, including
near the floor. If you smell gas,
STOP!
Follow “B” in the safety information
above. If you do not smell gas, go to
the next step.
5. Turn counterclockwise
to PILOT/
IGN, if knob does not turn then
slightly depress and turn. Once knob
is in PILOT/ IGN depress for five (5)
seconds.
Note:
The first time that the heater
is operated after connecting the gas
supply, the control knob should be
depressed for about 30 seconds. This
will allow air to bleed from the gas
system.
6. With control knob pressed in, push
down and release the ignition button.
This will light pilot. If needed keep
pressing igniter button until pilot
lights.
7. Keep control knob pressed in for (30)
seconds after lighting pilot. After 30
seconds, release control knob.
• If pilot does not stay lit, refer to
Troubleshooting, pages 12-15. Also,
contact a qualified service person or
gas supplier for repairs.
• If control knob does not pop up when
released, contact a qualified service
person or gas supplier for repairs.
Figure 17
Figure 16
Correct Pilot Position
Incorrect Pilot Position
CAUTION:
Do not try to adjust
heating level by using equipment
shutoff valve.
8. When the pilot is lit, turn the control
knob counterclockwise
to heating
level. The main burner should light.
9. To select the desired heat level, turn
the temperature setting knob to
desired comfort setting from 1 to 5.
To Turn Off Gas To Appliance
SHUTTING OFF HEATER:
1. Turn off equipment shutoff valve.
2. Turn control knob clockwise
to
the OFF position.
SHUTTING OFF BURNER ONLY
(PILOT STAYS LIT)
1. Turn control knob clockwise
to
the PILOT/IGN position.
THERMOSTAT CONTROL
OPERATION
FOR MHVFRD20NGBT,
MHVFRD20NGT, MHVFRD30NGBT,
MHVFRD30NGT:
The thermostatic control simply turns
on and off the burner.
FOR MHVFBF20NGBT,
MHVFBF20NGT, MHVFBF30NGBT,
MHVFBF30NGT:
The thermostatic control modulates
the flame size as the temperature gets
closer to set point, then it turns off the
burner upon reaching temperature.
The burner will cycle back on when
room temperature drops below the set
temperature. The control knob can be
set to any heat level between 1 and 5.
INSPECTING BURNER
Check pilot flame pattern and burner
flame pattern often.
PILOT FLAME PATTERN
Figure 17 show a correct pilot flame
pattern and also shows an incorrect
pilot flame pattern. The incorrect
pilot flame pattern is not touching
thermocouple. This will cause the
thermocouple to cool. When the
thermocouple cools, the heater will
shut down. If pilot flame pattern is
incorrect, as shown in Figure 17:
• Turn heater off (refer back to
To Turn
OFF Gas to Appliance
)
• See
Troubleshooting
, pages 12-15.
OPERATION
WARNING:
If you do not follow
these instructions exactly, a fire or
explosion may result causing property
damage, personal injury or loss of life.
Igniter Button Control
Knob
