Rheem RGFE Installation Instructions Manual page 33

DOWNFLOW/HORIZONTAL
®
MODELS
NOTE: Combustion air inlet and exhaust
outlet air pipes are reversed for down-
flow and horizontal models from that of
upflow.
The exhaust pipe connection is a 2-in.
PVC pipe fitting extending through the
right side of the furnace top cover. This
opening has a protective cap which
should be removed just prior to installing
the exhaust pipe. When 2-in. pipe is
used, connect it directly to this fitting.
When 3-in. pipe is used, connect with a
2- to 3-in. coupling directly to the 2-in.
pipe.
The combustion inlet air connection is a
2-in. extruded hole on the left side of the
top plate. When a 2-in. pipe is used,
attach a 2-in. PVC coupling over this
hole with RTV sealant and also add two
sheet metal screws through the coupling
into the extrusion to secure it in place,
and add the required piping. When 3-in.
pipe is required, use a 2- to 3-in. cou-
pling and add the required piping. See
Figure 29.
IMPORTANT: Always pre-drill holes
before securing with screws. Using self-
tapping screws without first pre-drilling
causes the PVC fitting to crack.
FIGURE 29
UPFLOW MODELS -- COMBUSTION AIR FITTING
FIGURE 27
UPFLOW COMBUSTION AIR AND VENT PIPE CONNECTION
(GAS VALVE MAY BE DIFFERENT THAN SHOWN)
"O" RING
TOP PLATE
VENT CAP/PLUG
OUTLET AIR PIPE
EXHAUST TRANSITION
CONNECTOR
CONDENSATE TRAP
FIGURE 28
DOWNFLOW COMBUSTION AIR AND VENT PIPE CONNECTION
(GAS VALVE MAY BE DIFFERENT THAN SHOWN)
TOP PLATE
COUPLING
NOTE:
ATTACH COUPLING TO EXTRUDED
COLLAR WITH TWO SCREWS. PUT
BEAD OF SILICONE AROUND BASE
BEFORE MOUNTING COUPLING.
COMBUSTION
AIR CHASE
INDUCED DRAFT
BLOWER
COMBUSTION
AIR ADAPTER
NOTE:
WHEN COMBUSTION AIR INLET IS IN
OPTIONAL POSITION SWAP LOCATION
OF INLET AIR ADAPTER AND "O" RING
WITH PLUG.
PLUG OPT. COMBUSTION
AIR INLET POSITION
INDUCED DRAFT
BLOWER
VENT CAP/PLUG
EXHAUST AIR
PIPE - PVC
CONNECTOR
OUTLET AIR PIPE
EXHAUST TRANSITION
® FIGURE 30
DOWNFLOW/HORIZONTAL MODELS -
COMBUSTION AIR AND VENT PIPE CONNECTION
A1119-01_1
A1119-01_2
33