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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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