Mr. Heater MH50K operating instructions Operating Instructions, Maintenance and Storage, Unpacking

OPERATING INSTRUCTIONS

UNPACKING

1.Remove all protective material which may have been applied to the heater for shipment.

2.Remove heater from carton.

3.Check the heater for possible shipping damage. If any damage is found immediately notify the dealer from whom you purchased the heater.

PREPARING FOR OPERATION

1.Check the heater for possible shipping damage. If any is found, immediately notify the factory.

2.Follow all of the "Precautions".

3.Fill the fuel tank with clean kerosene, No. 1 fuel oil or No. 1 diesel fuel only. Kerosene is recommended for use when the temperature drops below 0°F (-18°C).

In extremely cold weather, condensation may develop in the tank and it is recommended that a tablespoon of

de-icer be added for each gallon (4 liters) of fuel in the tank. When filling the heater, use at least 2 gallons (8 liters) of fuel. Be sure heater is level and do not overfill. Use a funnel or can with a long fill spout.

IMPORTANT: Before filling fuel tank the first time or after extended storage periods, drain the fuel tank of any moisture or condensation.

4.Locate heater at a safe distance from combustible materials. Model MH50K is not suitable for use on wood floors or other combustible materials. When used, the heater should rest on suitable insulating material at least 1 inch think and extending 3 ft. or more beyond the heater in all directions.

START

1.Plug heater into a well grounded 115V, 60HZ, 1Ø source of power.

In cold weather, starting may be improved by holding a finger over the end of the pressure adjusting screw until the heater starts. This unit is equipped with a circuit breaker

located near the power cord. If the unit does not start, check to see that the reset button is pressed in.

STOP

1.Unplug the heater.

RESTART AFTER SAFETY SHUTDOWN

1.Wait 5 minutes.

2.Push reset button.

MAINTENANCE AND STORAGE

WARNING: To prevent personal injury, unplug the heater from the wall outlet before servicing.

For maximum effIciency and trouble-free service, make the following periodic maintenance, cleaning and inspections.

DAILY SCHEDULE

1.GENERAL. Make general visual inspection of heater for loose or damaged parts. Check nuts and bolts to insure against looseness caused by vibration or rough handling. Damaged parts should be repaired or replaced before using heater again. Check heater operation to be sure it is operating normally (See "Servicing" section for description of normal

operation).

2.FILTERS. Dirty air or fuel filters will cause an imbalance in the air-fuel mixture. The best indication that this condition exists is an increase in odors or difficulty getting your heater to ignite. This heater should never be operated without the filters in place. If required, clean filters as described under "500 Hours" and "Annual Schedules".

500 HOUR SCHEDULE

1.AIR INTAKE FILTER. Remove and wash the filter element with a mild detergent, dry thoroughly and replace. Do not oil the filter element. If your heater is used where there is considerable dust or dirt, clean as often as necessary (approximately every 50hrs.).

2.REMOVE DUST. Clean heater twice a season (more often under dusty conditions). Remove accumulated dust from the transformer, burner, motor and fan blades with compressed air. Wipe area clean with a clean dry cloth. Inspect area to insure all foreign materials are removed, especially around the burner and combustion area.

3.CAD CELL. Clean the glass portion of the cad cell with a soft dry cloth.

4.NOZZLE. Accumulation of dirt from fuel and carbon from the compressor vanes will eventually fill up the passages in the nozzle, resulting in reduction of fuel and air flow.

Pressure will gradually increase giving improper fuel-air mixture and excess odor and smoke. If this occurs, replace the fuel nozzle.

5.FUEL TANK. Clean twice a season (during frequently used periods, clean twice a month). Drain and flush the fuel tank with clean fuel oil.

ANNUAL SCHEDULE

1.AIR OUTPUT FILTER. Remove the air output filter and tap the contaminated side gently on a solid object to remove contaminates. Compressed air or liquids should not be used to clean this filter. Reinstall cleaned filter in filter body in the same position as it was when removed. If the filter appears extremely dirty, replace it with a new filter of the same type. When replacing the filter cover, be sure the gasket is firmly in place and the screws in the filter cover are tight to prevent air leaks.

2.FUEL FILTER. Remove the fuel filter from fuel line and direct compresed air through the filter in the opposite direction of fuel flow. Safety glasses should be worn when using compressed air.

3.AIR AND FUEL LINES. If the air or fuel lines are removed during cleaning, be sure all connections are tight before operating unit.

4.AIR PRESSURE SETTING. The air pressure has been properly set at the factory. If the air pressure is out of adjustment, it will most likely be caused by dirty air filters, a partially plugged nozzle, an air leak in the system or improperly set pressure. If adjustment becomes necessary, first determine the proper pressure setting for your heater which is printed on the serial label located on the fuel tank. Remove the plug from the air filter cover and attach an accurate pressure gauge calibrated to a maximum reading of 15 PSI. Start the heater and note the pressure reading. If the pressure is low, slowly turn the pressure adjusting screw in (Clockwise) until the correct pressure is obtained. If the air pressure is high, turn the adjusting screw out (counter- clockwise) until the pressure is correct. When correct pressure is reached, unplug the heater, remove the guage and replace the plug.

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