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YOUR FURNACE
Condensing furnaces have a higher efficiency rating
than conventional gas furnaces, but are basically the
same in design and operation, The major difference
is the addition of a secondary heat exchanger which
captures heat that would normally go out the furnace
vent pipe,
By capturing this heat the flue gases are cooled to a
point where most of the vapor' (mainly water) con-
denses out and must be drained away, Because the
gases are cooled down plastic pipe is used for the vent
pipe in place Of metal.
The following paragraphs and Illustration wil! help you
to understand the main parts of your furnace and how
they operate.
DOOR INTERLOCK SWITCH
All of the electrical power for the furnace goes through
the Door Interlock Switch and the furnace will not
operate if the Blower Door is not properly in place.
ELECTRICAL
JUNCTION/CONTROL BOX
System Relay
Fan Relay
Transformer-1 15V to
DOOR INTERLOCK SWITCH
EXHAUST TEMPERATURE
LIMIT SWITCH
COMBUSTION AIR
BLOWER
FAN/LIMIT CONTROL
ELECTRONIC SPARK
MODULE
FLAME ROLLOUT
SPARK IGNITOR/PILOT BURNER
OR HOT SURFACE IGNITOR
AND MAIN BURNERS
INFORMATION LABELS
Safety & Service Clearances
Lighting Instructions (inside or on
Back Side of Door Panel)
Rating Plate
FIG. 2
TYPICAL COUNTERFLOW
CIRCULATING AIR BLOWER
AIR PROVING SWITCH
SECONDARY HEAT EXCHANGER
PRIMARY HEAT EXCHANGER
White Rodgers Valve - 36 E Series
Hot Surface Ignition
@
Honeywell Valve - 8204 Series
Spark to Pilot Ignition
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