Component Description And Operation - PHP Heat Wagon LVF90A Service Manual

Component Description and Operation

12 o'clock
Fig. 1
(E) Mount screw
(Pump body ring)
(A) Back of Motor
(B) Pump Body Ring (G) .003 to .005 Gap
(C) Rotor
(F) Rotor Insert
(D) Blade or Vane
(H) Large Gap
6 o'clock
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 fil-
ter 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
FIG. 2
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.
17