Mr. Heater MHU300NG User Manual

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Large Unit Heater

Operating Instructions and Owner’s Manual

Call for heat

Flame Lost Sequence

Start-Up Failed Pressure Switch Condition Change Sequence

Failed Combustion Air Flow Monitoring Sequence

SEQUENCE OF OPERATION

1. STOP! Make sure you have read and understand all of the safety

information regarding the operation of this gas appliance. Any and

all service should be performed by a licensed installer

2. Set the thermostat to lowest setting.

3. Turn off all electrical power to appliance.

4. This appliance is equipped with an ignition device which

automatically lights burner. DO NOT attempt to light the burners

manually.

5. There is a main shut-off valve upstream of the unit. Open it. (See

Figure 9 on Page 11)

6. Wait five minutes to clear out any gas. If you then smell gas, STOP!

Immediately call your gas supplier from a neighbor’s phone. Follow

the gas supplier’s instructions. If you do not smell gas go to next

step.

7. Turn on electrical power to unit.

8. Set the thermostat to desired setting.

WARNING: Should overheating occur, or the gas supply

control system fail to shut off the flow of gas, shut off the

manual gas valve to the utility heater before shutting off the

electrical supply

SHUTDOWN PROCEDURES

1. Set thermostat to lowest level.

2. Turn off all electrical power to unit if service is to be performed.

3. Turn manual shut off knob upstream the unit. Do not force.

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Mr. Heater MHU300NG Big Maxx 300,000 BTU Dual-Fuel Forced Air Commercial Garage Heater