Remington HH-70T-KFA Service Manual Page 11

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DESA Service Information
Oil Fired Heaters
Component Description and Operation
Air Pump
The heater's air pump consists of a rotor (c) with four
carbon blades (d) rotating inside a pump body(b). The
rotor is driven directly by the motor (a) and is attached to
the motor shaft by means of a plastic insert (f). As the
motor rotates, the carbon blades travel outward rubbing
against the inside surface of the steel pump body (d). The
rotor's position inside the pump body is such that it is off
centered with the pump body and a .003/.004 of an inch
gap is set at the uppermost quadrant (g). As the motor
rotates, the air between the blades (h) is compressed and
routed to the nozzle through the air line.
Air Filters
The air filtering system consists of an air input filter and air output filter. The air input
filter is located at the right rear of the motor and its purpose is to filter all incoming air
prior to entering the air pump.
The filter design is such that it can be cleaned in a mild, soapy solution, thoroughly
dried and used over again.
The air output filter is located under the plastic end cover. This filters purpose is to
prevent any carbon dust (from rotor or blade wear) from entering the air passages in the nozzle. This filter is non-cleanable
and should be replaced when considerable build-up of carbon dust is observed.
Nozzle
As mentioned previously, the purpose of the air pump is
to compress air and deliver it to the nozzle. The
compressed air, as it travels through the nozzle, creates a
negative pressure and lifts the fuel from the fuel tank.
The fuel from the fuel tank and the compressed air are
mixed at the nozzle which results in a very fine mist of
fuel being sprayed into the combustion chamber. The air
pump/nozzle combination eliminates the need for a
conventional type fuel pump. It is important for the
service technician to understand the nozzle operation.
In many cases concerning improper operation of a
heater, the problem is the result of a seal leak or a restriction (dust/dirt) being present within the nozzle. It should also be
pointed out that each model heater requires different nozzles due to different fuel flow rates.
Combustion System (Burner Head)
The burner head is mounted to the rear of the combustion chamber. The purpose of the burner
head is to meter and mix the amount of air entering the chamber to obtain proper combustion
characteristics. The nozzle is mounted in the chamber from the burner head and is surrounded by
fins, so that the amount of air entering the chamber from the burner head is equal and balanced.
The size of the slots in the burner head differ between models.
(A) Back of Motor
(B) Pump Body Ring
(C) Rotor
(D) Blade or Vane
(E) Mount screw
(Pump body ring)
(F) Rotor Insert
(H) Large Gap
(G) .003 to .005 Gap
6 o'clock
FIG. 2
FIG. 3
FIG. 4
—11—
Phone: 800-362-6951 • Fax: 800-255-7985
www.phpdistribution.com
Oil Heater Service Info.
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