Rheem Raypak Hi Delta P902C Installation & Operating Instructions Manual page 38

Certified
Model
Venting
No.
Material
302C
402C
502C
Category III
652C
752C
902C
* Subtract 10 ft per elbow. Max. 3 elbows.
Maximum combustion air duct length terminated at 100 equivalent ft.
Use only the special gas vent pipes listed for use with
Category III gas burning heaters, such as the stainless
steel vents offered by Heat Fab Inc. (800-772-0739),
Protech System, Inc. (800-766-3473), Z-Flex (800-
654-5600) or American
(800-423-4270). Pipe joints must be positively sealed.
Follow the vent manufacturer's installation instructions
carefully.
Ducted Air - Horizontal Through-the-
Wall
Fig. 41: Ducted Air - Horizontal Through-the-Wall
Installation
These installations utilize the heater-mounted blower
to draw combustion air from outdoors and vent com-
bustion products to the outdoors.
The total length of the through-the-wall flue cannot
exceed 40 equivalent ft in length for the flue outlet.
Each elbow used is equal to 10 ft of straight pipe. This
Maximum
Vent Size Equivalent
Vent Length*
5"
70'
Room Air
6"
40'
Ducted
Combustion
8"
Air
Table N: Category III Horizontal and Ducted Air
Metal Products
38
Combustion
Air Inlet Max. Length
Air Intake
Pipe Material
Galvanized
Steel,
PVC,
ABS,
CPVC
will allow installation in one of the three following
arrangements:
• 40' of straight flue pipe
• 30' of straight flue pipe and one elbow
• 20' of straight flue pipe and two elbows.
The total length of either air supply or vent pipe cannot
exceed the distances listed in Table N. Each elbow
used is equal to 10 ft of straight pipe. This will allow
installation in any arrangement that does not exceed
the lengths shown in Table N.
The flue direct vent cap is not considered in the overall
length of the venting system.
Care must be taken during assembly that all joints are
sealed properly and are airtight.
The vent must be installed to prevent the potential ac-
cumulation of condensate in the vent pipes. It is
required that:
1. The vent must be installed with a slight downward
slope of not more than 1/4 inch per foot of hori-
zontal run to the vent terminal.
2. The vent must be insulated through the length of
the horizontal run.
For installations in extremely cold climate, it is re-
quired that:
1. The vent must be installed with a slight upward
slope of not more than 1/4 inch per foot of hori-
zontal run to the vent terminal. In this case, an
6" 8"
100' N/A
75'
100'
40'
30' 80'