Rheem Gra Series Installation Instructions Manual page 24

• Insulate the entire length of vent
pipe, between the elbow where the
pipe exits the wall and the elbow
where the termination is made, with
a closed-cell insulation, such as
"Arm-a-Flex" or "Rub-a-Tex" with a
minimum of 1/2" thickness.
• All elbows installed on the exterior
of the building must be of the long
sweep nature.
• As required for the horizontal piping
ran within the structure, any pipe
ran horizontal outside the structure
must slope upward a minimum of
1/4" per foot run so that condensate
drains toward the furnace.
From the top elbow in the exhaust
pipe, extend a length of PVC pipe
outward so that it terminates exactly
12 inches from the wall. See Figure
18. Reduce the termination pipe
extension to is 1 / inch pipe for
1
2
45,000 BTUH through 75,000 BTUH
units.
The 45,000 BTUH unit only uses kit
RXGY-D02. The 60,000 BTUH and
75,000 BTUH units may use kits
RXGY-D02 or RXGY-D03 depending
on pipe lengths and number of
elbows. Use kit RXGY-D03 with
90,000 BTUH through 120,000 BTUH
units. The RXGY-D04 kit only
applies to the 120,000 BTUH unit
using an alternate termination and
long runs. See Table 2.
The following are parts lists for the
RXGY-D02, RXGY-D03 and RXGY-
D04 alternate horizontal direct vent
termination kits:
RXGY-D02
1. 2-in. tee with reducer assembly
2. / -in. PVC 6-in. dia. trap
1
2
3. PVC vane
4. 2-in. PVC elbow
5. 1 / -in. PVC nipple with coupling
1
2
6. PVC strap
7. vent template
24
FIGURE 18
ALTERNATE HORIZONTAL DIRECT VENT TERMINATION
SEE DETAIL A
3" MAX.
NOTE: 3-1/2"
MAX. WHEN
D04 KIT IS
USED.
60" MAX.
3"
EXHAUST
4"
INTAKE OPTIONAL
DETAIL B
EXHAUST / INTAKE RELATIONSHIP
RXGY-D03
1. 3-in. tee with reducer assembly
2. / -in. PVC 6-in. dia. trap
1
2
3. PVC vane
4. 2-in. PVC elbow
5. PVC strap
6. vent template
RXGY-D04
1. 2 / -in. PVC elbow
1
2
2. 3" x 2 / " PVC bushing
1
2
3. 2 / " x 6 / " long PVC pipe
1 1
2 2
4. 2 / " x 16" long PVC pipe
1
2
5. 2 / " x 21" long PVC pipe
1
2
6. PVC vane
7. 3-in. tee with reducer assembly
8. 6-in. dia. / -in. PVC trap
1
2
9. PVC strap
10. vent template
NOTE: The RXGY-D04 kit only
applies to the 120,000 BTUH unit
using an alternate termination and
excessively long runs.
EXHAUST VENT
2 / " PVC FOR MODELS WITH 120,000 BTU INPUT
1
2
(KIT NO. RXGY-D04)
2" PVC FOR MODELS WITH INPUTS OF 90,000 AND
120,000 BTU. REDUCE TO 1 / " FOR MODELS WITH
1
2
INPUTS OF 45,000 THRU 60,000 BTU (SEE DETAIL A).
ELBOWS AND RISERS ARE 2" PVC.
INTAKE VENT
2 / " PVC FOR MODELS WITH
1
2
120,000 BTU INPUT.
2" PVC ELBOWS AND RISER
MODELS WITH INPUTS OF 45,000
THRU 120,000 BTU.
USE KIT NO. RXGY-D02 WHEN 2" PIPE
IS USED BETWEEN FURNACE AND
OUTSIDE WALL. USE KIT NO. RXGY-D03
WHEN 3" PIPE IS USED.
PIPE
SUPPORT
STRAP
1
1 / " PIPE
2
INTAKE
DETAIL A
EXHAUST VENT FOR
MODELS WITH
INPUT OF 45,000 THRU
60,000 BTU
I339