Thermostat Control Operation; Inspecting Burner; Pilot Flame Pattern; Burner Flame Pattern - Mr. Heater MHBF30NGT Installation Instructions And Owner's Manual

•
If pilot does not stay lit, refer to Troubleshoot-
ing, pages 14 & 15. Also, contact a qualified
service person of gas supplier for repairs.
•
If control knob does not pop up when released,
contact a qualified service person or gas sup-
plier for repairs.
8. When the pilot is lit, turn control knob coun-
terclockwise to heating level. The main burner
should light.
9. To select the desired heat level, turn the
temperature setting knob counterclockwise to
between 1 & 5.

THERMOSTAT CONTROL OPERATION

FOR IR20NGT / IR30NGT: The thermostatic control
used simply turns on and off the burner.
FOR BF20NGT / BF30NGT: The thermostatic control
used 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. Selecting the
HI setting will cause the burner to remain on.
Note: The thermostat sensing bulb measures the
temperature of air near the heater cabinet. This may
not always agree with room temperature (depend-
ing on housing construction, insulation location,
room size, open air temperature, etc.). Frequent
use of your heater will let you determine your own
comfort levels.
The LED temperature indicator measures approximate
room temperature around the heater.
Note: The LED temperature indicator DOES NOT oper-
ate with or control the thermostat setting of the heater.
TO TURN OFF GAS TO APPLIANCE
SHUTTING OFF HEATER
1. Turn control knob clockwise to the OFF posi-
tion.
2. Turn off all electrical power to the appliance if
servicing is to be preformed.
3. Turn off equipment shutoff valve.
SHUTTING OFF BURNER ONLY (PILOT STAYS LIT)
1. Turn control knob clockwise to the PILOT/IGN
position.

INSPECTING BURNER

Check pilot flame pattern and burner flame pattern
often.

PILOT FLAME PATTERN

Figure 21 show a correct pilot flame pattern. Figure 22
shows an incorrect pilot flame pattern. The incorrect
pilot flame pattern is not touching thermocouple. This
will cause the thermocouple to cool. When the thermo-
Unvented Natural Gas Fired Room Heater
couple cools, the heater will shut down. If pilot flame
pattern is incorrect, as shown in Figure 22:
•
Turn heater off (see To Turn OFF Gas to Ap-
pliance, page 11 for non-thermostat models or
page 12 for thermostat models).
•
See Troubleshooting, pages 14 and 15.
Figure 21

BURNER FLAME PATTERN

Figure 23 show a correct burner flame pattern. Figure
24 shows an incorrect burner flame pattern. If burner
flame pattern is incorrect, as shown in Figure 24:
•
Turn heater off (see To Turn OFF Gas to Ap-
pliance, page 11 for non-thermostat models or
page 12 for thermostat models).
•
See Troubleshooting, pages 14 and 15.
12
Installation Instructions and Owner's Manual
Figure 22
Figure 23a.
Figure 23b.
Figure 24a.