Rheem RGFG Installation Instructions Manual page 22

HORIZONTAL TERMINATIONS
All horizontal venting must be done
with direct venting (2 pipe). Furnaces
installed as non-direct vent must be
terminated vertically.
STANDARD HORIZONTAL TERMINA-
TIONS (SEE FIGURE 13)
NOTE: All furnaces with horizontal air
intakes (except those using horizontal
concentric vent kit RXGY-E03A) must
have a drain tee assembly and trap
installed in the combustion air pipe as
close to the furnace as possible. This is
to drain any water that may enter the
combustion air pipe to prevent it from
entering the furnace vestibule area.
These parts are included in horizontal
vent kits RXGY-D02A, RXGY-D03A and
RXGY-D04A.
NOTE: The combustion air and exhaust
terminations must be at least 12 inches
above grade or anticipated snow levels.
Use alternate horizontal terminations
when termination locations are limited
and higher snow levels are anticipated.
FIGURE 13
STANDARD HORIZONTAL DIRECT VENTING
UPFLOW MODEL SHOWN
(TYPICAL FOR DOWNFLOW/HORIZONTAL MODELS)
NOTES:
ΠSUPPORT HORIZONTAL
PIPE EVERY FOUR FEET.
WHEN 3 IN. PIPE IS USED REDUCE TO

2 IN. BEFORE PENETRATING OUT-
SIDE WALL.
18 IN. MAXIMUM. 2 IN. DIAMETER
Ž
PIPE MAY BE USED INSIDE THE
WALL.
DETAIL "A" - EXHAUST TERMINATION

TERMINATE THE LAST 12 INCHES
WITH 2" PVC PIPE ON 90,000 AND
120,000 BTUH MODELS.
 INCREASE THE 12 IN. MINIMUM
ABOVE GRADE TO KEEP TERMINAL
OPENINGS ABOVE ANTICIPATED
LEVEL OF SNOW ACCUMULATION
WHERE APPLICABLE.
‘ DETAIL "B", INSTALL WIND DEFLEC-
TOR VANE IN 2 IN. PVC COUPLING IN
VERTICAL POSITION USING PVC
SOLVENT.
THE COMBUSTION AIR TERMINATION
MUST BE IN THE SAME PRESSURE
ZONE AS THE EXHAUST TERMINA-
TION.
22
NOTE: Ensure the location of the com-
bustion air inlet with respect to the
exhaust vent terminal complies with
Figure 13, detail C.
Combustion Air Piping: Use a 2" PVC
coupling with a wind deflector vane (pro-
vided) installed as follows:
1. Install a 2" coupling to the combus-
tion air pipe at the outside wall to
prevent the termination from being
pushed inward.
2. Cut a 2 1/4" length of 2" PVC pipe
and connect this to the coupling.
3. Connect another 2" coupling to the
end of the 2 1/4" length of pipe.
Terminate this outer coupling 4
inches from the wall.
4. Attach the vane in the final 2" cou-
pling in the vertical position with
PVC cement.
1
DETAIL C
EXHAUST/INTAKE RELATIONSHIP
IMPORTANT: To insure proper fur-
nace operation, install the vane in
the vertical position as shown in
Figure 13, Detail B. Failure to install
the vane properly can result in nui-
sance tripping of the pressure
switch.
Exhaust Vent Piping:
60,000 and 75,000 BTUH models:
Use 2" pipe only for the entire
length of the vent.
90,000 through 120,000 BTUH
models: Install a 2" coupling at the
outside wall to prevent the termina-
tion from being pushed inward. No
reduction of the 2" pipe used to
penetrate the wall is necessary.
Terminate the 2" PVC exhaust vent
at least 12 inches from the outside
wall.
PIPE REDUCTION NOT
REQUIRED ON 60 & 75K
2 3
MODELS
4
EXHAUST
TERMINATION
(90, 105 & 120K
MODELS)
6
DETAIL B
COMBUSTION AIR TERMINATION
NO SCREENS OR ELBOWS
AT THE END OF THE PIPES
DETAIL C
5
DETAIL A
12"
ST-A0407-00