Remington HH-70T-KFA Service Manual download pdf (Page 12)

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Oil Heater Service Info.

DESA Service Information

Oil Fired Heaters

Component Description and Operation

Desa Spark Plug

The spark plug is the igniter for the fuel. The electrical energy from the ignition transformer causes a spark to jump across the gap

between the electrodes of the spark plug. The proper spark gap is shown in FIG 7.

Spark plugs suffer from a number of maladies including dirty electrodes, gap wear or erosion, cracked ceramic, etc. Spark plugs should be

inspected frequently and replaced

periodically if faulty. Some heaters use two independent electrodes. Independent electrodes also require proper setting (FIG. 8)

Electrode Settings

Models:

B80 & B99 75,000

B120 120,000

Models:

B100 100,000 BTU

B125 125,000 BTU

Electric Igniter

(Applicable models use 079870-01 or 102482-01 Electronic Igniter)

The electronic igniter operates on 120V60 Hz. It delivers approximately 15,000 volts average to the spark plug causing the

kerosene sprayed from the nozzle assembly to ignite. The igniter operates on a pulse basis. The igniter has no internal

service parts and must be replaced when found defective.

Note: It is important for the service technician to be cautious

when working with the electronic igniter due to its high voltage

output.

Spark Plug Gap—.050 inches or

1.27 Millimeters

(For single post electrode use 1/16” gap

or .063)

FIG. 7

1/8 IN. BETWEEN

ELECTRODE

3/8 IN.

1/4 IN.

3/16” BETWEEN

ELECTRODES

1/4” out

3/8”

FIG. 8

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Remington HH-70T-KFA Service Manual Page 12