Honeywell Y343B1002 User Manual
Attention! The text in this document has been recognized automatically. To view the original document, you can use the "Original mode".
Q354A FLAME SENSOR, Q347A SPARK IG
DEPENDABLE BURNER IGNITION
□ Spark generated by electronic module and
internal step-up transformer.
SOLID STATE DESIGN
Compact, solid state components provide
accurate, long-lasting performance.
□ No mechanical friction or wear.
MAXIMUM OPERATING SAFETY
□ Proves presence of flame on burner igni
tion, then protects against burner flame-out
and interruption of electric power or gas sup
ply during run cycle.
□ Open or short circuit in any electronic com
ponent results in safety shutdown.
USES FLAME RECTIFICIATION PRINCIPLE
□ Any false flame signal, including electrical
short or ground, results in safety shutdown.
□ Ignition is started, main burner is ignitied,
monitored during main burner-on period. Ig
nition spark is discontinued when flame is
□ After safety shutdown, equipment must be
manually reset from remote thermostat or
trial-for-ignition. If malfunction exists, correc
tion must be made before system is manually
LOW VOLTAGE CONTROL CIRCUIT
□ Permits use of 24 V thermostat for op
timum temperature control.
□ Reduced wiring costs — both on appliance
and on job.
GAS VALVE CONTROL
□ S87D internal relay switches the gas valve
on and off.
□ System can be used with a 2-stage gas
valve, if desired.
□ Optional alarm circuit provides 24 Vac for
an automatic visual or audible signal if any
part of system malfunctions and causes a
©Honeywell Inc. 1983