--
FIGURE 37
SIDE COMBUSTION AIR INTAKE CONNECTION
..,.
CONNECTING COMBUSTION AIR
INLET TO THE FURNACE
IMPORTANT: Clean and debur all
pipe cuts. The shavings must not
block the exhaust, combustion air or
condensate drain pipes.
1. UPFLOW FURNACE
The combustion air connection is at
the right side of the top plate. An
alternate combustion air connection
may be made on the right side of the
jacket. This opening has a plastic
cap. A connection fitting is supplied
in a cloth bag with the furnace. Install
this connection by screwing it into
the opening. Be sure to use the "O"
ring provided for a tight seal.
Use the large conduit nut to secure
the combustion air inlet connection to
the furnace.
IMPORTANT: When using the side
opening. remove the plastic cap from
the side. DO NOT REMOVE THE
TOP CAP. This cap must close the
unused opening to maintain a
sealed system. See Figure 37.
COMBUSTION
AIR
2. DOWNFLOW/HORIZONTAL
FURNACE
The combustion air connection is a
2" extruded hole on the left side of
the top plate. When 2" pipe is used,
attach a 2" PVC coupling over this
hole with RTV sealant. Also drill
two 1/8" holes and add two
sheet metal screws through the
coupling into the extrusion to
secure it in place. then add the
required piping. When 3" pipe is
required, use a 2" to 3" coupling
and add the required piping.
See Figure 38.
FIGURE 38
DOWNFLOW/HORIZONTAL COMBUSTION AIR
AND VENT PIPE CONNECTION
TOP PLATE ._._,_
- VENT CAP/PLUG
COUPLING\\
NOTE: ATTACH COUPLING TO \.\\ \
EXTRUDED COLLAR WITH • •
TWO SCREWS. PUT BEAD OF
0
SILICONE AROUND BASE ..,_ _ _... ci
EXHAUST
BEFORE MOUNTING
/- VENT PIPE-
COUPLING.
/ PVC
/
./
/
//
/ I
I
,.i
r- CONNECTOR
,,/
COMBUSTION
AIR CHASE
CAUTION:
PRE-DRILL HOLES
BEFORE ATTACHING
SCREWS
EXHAUST
TRANSITION
,-- DRAIN VENT
DRAIN
/ EXTENSION
TEE
TO FLOOR
INDUCED DRAFT ,/
DRAIN
BLOWER ' CONDENSATE TRAP -
37
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