Rheem RGRK-12ERAJS Series Installation Instructions Manual page 27

FIGURE 19
STANDARD VERTICAL DIRECT VENTING
4
EXHAUST
TERMINATION
DETAIL A
5
48" MAX
ROOF LINE
EXHAUST PIPE
NOTES:
1 INCREASE THE 12-IN. MINIMUM
TO KEEP TERMINAL OPENING
ABOVE ANTICIPATED LEVEL OF
SNOW ACCUMULATION WHERE
APPLICABLE.
2 WHEN 3-IN. DIAM. PIPE IS USED,
REDUCE TO 2-IN. DIAMETER BEFORE
PENETRATING ROOF. A MAXIMUM
OF 18 IN. OF 2-IN. PIPE MAY BE 3
USED BEFORE PASSING
THROUGH ROOF.
SUPPORT VERTICAL PIPE EVERY 6
3
FEET.
4 EXHAUST TERMINATION - TERMINATE
THE LAST 12 INCHES WITH 2" PVC PIPE
ON 90,000 AND 120,000 BTUH MODELS.
REDUCE AND TERMINATE THE LAST
12 INCHES WITH 1 1 / " PVC PIPE ON
2
45,000 THROUGH 75,000 BTUH
MODELS. SEE DETAIL A.
5 30" MAXIMUM EXPOSED VENT
LENGTH.
6 THE COMBUSTION AIR PIPE MUST
TERMINATE IN THE SAME PRESSURE
ZONE AS THE EXHAUST PIPE.
7 NO SCREENS MAY BE USED TO
COVER COMBUSTION AIR AND
EXHAUST.
FIGURE 20
STANDARD HORIZONTAL DIRECT VENTING
SUPPLY AIR
EXHAUST PIPE
COMBUSTION AIR PIPE
NOTES:
1 SUPPORT HORIZONTAL PIPE
EVERY FOUR FEET.
WHEN 3 IN. PIPE IS USED REDUCE TO 2 IN.
2
BEFORE PENETRATING OUTSIDE WALL.
3 18 IN. MAXIMUM. 2 IN. DIAMETER PIPE MAY
BE USED INSIDE THE WALL.
4 DETAIL "A" - EXHAUST TERMINATION
TERMINATE THE LAST 12 INCHES WITH 2"
PVC PIPE ON 90,000 AND 120,000 BTUH
MODELS. REDUCE AND TERMINATE THE
LAST 12 INCHES WITH 1 1 / " PVC PIPE ON
2
45,000 THROUGH 75,000 BTUH MODELS.
5 INCREASE THE 12 IN. MINIMUM ABOVE
GRADE TO KEEP TERMINAL OPENINGS
ABOVE ANTICIPATED LEVEL OF SNOW
ACCUMULATION WHERE APPLICABLE.
6 DETAIL "B", INSTALL WIND DEFLECTOR
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 TERMINATION.
7 THE COMBUSTION AIR PIPE MUST
TERMINATE IN THE SAME PRESSURE
ZONE AS THE EXHAUST PIPE.
8 NO SCREENS MAY BE USED TO COVER
COMBUSTION AIR AND EXHAUST.
NO ELBOWS CAN BE INSTALLED AT
9
TERMINATION.
3" MAX.
SEPARATION
12"
36" MAX. COMBUSTION AIR
PIPE
12" MIN.
30" MAX
SEPARATION
12" MIN. ABOVE
ROOF LEVEL
2
COMBUSTION AIR PIPE
SUPPLY AIR
1
2" OR 3" TEE
W/DRAIN TRAP
RETURN AIR
VANE
6
COMBUSTION AIR TERMINATION
DETAIL B
6
MAX.
COMBUSTION
1
AIR PIPE
EXHAUST VENT
RETURN AIR
30" MAX
2
3
12"
4"
12" MIN. ABOVE
GRADE LEVEL
TRAP
SEE DETAIL B
CONNECT
TO DRAIN
2" PVC
COUPLING
EXHAUST
MAX.
VENT
12"
MIN.
3"
EXHAUST
VENT
12"
MIN.
12"
MIN.
12"
5
MIN.
ANTICIPATED
SNOW LEVEL
ROOF LINE
5
5
PITCHED ROOF INSTALLATIONS
12"
4
EXHAUST TERMINATION
DETAIL A
SEE DETAIL A
4"
5
3"
EXHAUST
4"
INTAKE
DETAIL C
EXHAUST / INTAKE RELATIONSHIP
3"
COMBUSTION
AIR PIPE
I407
OPTIONAL
INTAKE
I407
27