Electrical System; Motor; Flame Control Assembly - Desa B350D Service Manual

H I G H P R E S S U R E P O R T A B L E F O R C E D A I R H E A T E R S E R V I C E M A N U A L

ELECTRICAL SYSTEM

Motor

The motor is a fractional horsepower motor.
The motor drives the fuel pump and rotates
the fan. The turning fan delivers air into and
around the combustion chamber.
The motor contains two separate internal
windings. The first winding is the start wind-
ing. The second winding is the main winding.
The motor switches power from the start
winding to the main winding after the motor
reaches 75% of its rated speed. This switch-
ing is done by a centrifugal switch located

Flame Control Assembly

The heater is equipped with one of two flame
controls — a White-Rogers/Robert Shaw or
a standard flame control. The flame control
monitors the combustion chamber flame.
The control will shut off power to the heater
if the combustion flame goes out or if an
Figure 6 - White-Rogers/Robert Shaw
10
Figure 5 - Motor
Flame Control
inside the motor. The centrifugal switch also
supplies voltage to the fuel solenoid valve.
The motor also has a temperature/current
sensitive thermal protector wired in series
with both windings. This device protects the
motor from overheating if the fan/pump locks
up. If the fan/pump locks up, this device will
shut the motor off. Before motor will run
again, press red reset button located on top
of the motor housing (see Figure 5).
Reset Button
unusual flame color is present. A photocell
(attached to the burner head) monitors light
within the chamber. If the photocell detects
improper combustion or loss of flame, the
flame control will shut off power to the heater.
Figure 7 - Standard Flame Control