Component Identification and Function
Servicing
Instructions
8.1-4
4
O. Motor R
Relay
Used on heaters with motors rated
at 220 VAC. This device is wired
between the ignition module and
the motor and will feed voltage to
the motor upon receipt of voltage
from the ignition module.
P. On/Off S
Switch
Simple electrical device used to
supply and disconnect incoming
line voltage at the electrical control
panel of the heater.
Q. Orifice
Metering device which is drilled to
a specific diameter to allow a
volume of gas to be fed through
the burner at the stated manifold
pressure (see dataplate) to
achieve proper heat output.
R. Regulator
Mechanical devices used in gas
distribution systems. Its purpose is
to reduce a higher inlet pressure to
a preset lower pressure. The
regulator is responsible to supply a
steady outlet pressure to the
heater(s) despite changes in inlet
pressure, heater demand, and
weather conditions.
S. Thermostat
Electrical control which is basically
used as an “on/off” switch that
responds to changes in room
temperature.
T. Transformer
This device is responsible for
reducing a higher incoming voltage
(normally 120 V.A.C.) to a lower
outgoing voltage. The lower
voltage (24 V.A.C.) is essential to
operate the ignition control
module.
August 1999