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19200042-01B
Figure 20 - Burner Patterns
THERMOSTAT CONTROL OPERATION
The thermostat used on this heater senses the room temperature. At times the room may
exceed the set temperature. If so, the burner will shut off. The burner will cycle back on when
room temperature drops below the set temperature. The control knob can be set to any comfort
level between 1 and 5.
TO TURN OFF GAS TO APPLIANCE
Shutting Off Heater
Turn control knob clockwise to the
OFF position.
Shutting Off Burner Only (pilot
stays lit )
Turn control knob clockwise to the
PILOT position.
OPERATION
Note: If pilot goes out, repeat steps 3
through 7. This heater has a safety inter-
lock system. Wait one (1) minute before
lighting pilot again.
8. Turn control knob counterclockwise
to desired heating level. The main burner
should light. Set control knob to any heat
level between 1 and 5.
CAUTION: Do not try to ad-
just heating levels by using the
equipment shutoff valve.
WARNING: If input gas type is
NG, make sure NG pilot burner ig-
nites. If input gas type is LP, make
sure LP pilot burner ignites.
MANUAL LIGHTING PROCEDURE
1. Remove lower front panel.
2. Follow steps 1 through 5 under Lighting
Instructions, page 18.
3. With control knob pressed in, strike match.
Hold match to pilot until pilot lights.
4. Keep control knob pressed in for 30 sec-
onds after lighting pilot. After 30 seconds,
release control knob. Follow step 8 under
Lighting Instructions, page 18.
5. Replace lower front panel.
Figure 21 - Pilot Assembly
Pilot Air
Inlet Hole
Natural
Gas
Burner
Propane/LP
Gas Burner
Ignitor
Electrode
Thermocouple
Pilot Air Inlet Hole
Control Knob
Burners
MD2TPA MD3TPA
MD3TPA-BB
MD5TPA
MD5TPA-BB
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