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Servicing
Instructions
J. High LLimit S
Switch
A manually resetable temperature
activated switch. Its purpose is as
a safety device wired into the
control system to sense when an
overheat condition occurs, either
at the heat chamber or blower
outlet. The switch “opens” the
electrical circuit to the gas control
thereby shutting off gas flow. The
switch has a button located in its
center that will need to be pushed
in to reset the contacts if the
contacts open due to an overheat
condition.
K. Hot S
Surface IIgniter
Electrical ignition device used on
automatic ignition control systems.
Ignites gas by surface temperature
rather than by spark or flame.
L. Ignition C
Control
Controls the ignition sequence and
Module
operation of the heater as well as
monitoring the safety devices. A
major service feature is the
board’s ability to diagnose
component and flame failure by
means of a diagnostic light located
within the module. This light will
provide a specific flash pattern
repetitively, depending on the type
of component failure that has
occurred.
M. Manifold
Series of nipples or elbows that
convey the gas from the outlet of
the gas control valve to the burner
orifice.
N. Motor
An electrically powered device,
located in the air housing, in
conjunction with the fan wheel to
circulate air in the confinement
area.
August 1999
8.1-3
3
Component Identification and Function