Rheem RTGH-RH11DV Use And Care Manual page 28

All joints of positive pressure vent systems must be sealed completely to prevent leakage of flue products into living space.
• Remove all burrs and debris from joints and fittings.
• When using PVC or CPVC pipe, all joints must be properly cleaned, primed, and cemented. Use only cement and primer approved for use
with the pipe material. Cement must conform to ASTM D2564 for PVC and ASTM F493 for CPVC pipe.
NOTE: DO NOT CEMENT POLYPROPYLENE PIPE.
• Ensure the vent is located where it will not be exposed to prevailing winds.
• In all roof venting applications, exhaust discharge must point away from the pitch of the roof.
• To prevent water leakage, install adequate roof flashing where the pipe enters the roof.
• Do not locate vent over public walkways, driveways, or parking lots. Condensate could drip and freeze, resulting in a slip hazard or damage
to vehicles and machinery.
• Due to potential moisture build-up, sidewall venting may not be the preferred venting option. To save time and cost, carefully consider
venting installation and location.
• Horizontal lengths of exhaust vent must slope back towards the water heater not less than ¼" (0.6 cm) per foot to allow condensate to drain
from the vent pipe.
• The exhaust vent must terminate where vapors cannot make accidental contact with people or pets, or damage shrubs or plants.
• In vacant chimney applications, install and seal a rain cap over existing chimney openings.
• All piping must be fully supported. Use pipe hangers at a minimum of 4 foot (1.22 m) intervals to prevent sagging of the pipe where
condensate may form.
• Do not use the water heater to support any piping.
• DO NOT vent near soffit vents, crawl space vents, or other areas where condensate or vapor could create a nuisance or hazard or cause
property damage.
• DO NOT vent where condensate vapor could cause damage or could be detrimental to the operation of regulators, relief valve, or other
equipment.
• DO NOT vent the water heater in a chimney flue serving a separate appliance designed to burn solid fuel. The water heater may only be
vented in vacant chimneys.
• Maximum Snow Level Determination: These installation instructions reference snow levels in establishing a minimum height for the
installation of exhaust vent or air intake terminations. Snow levels shall be determined as follows:
a. The installation location may, by ordinance, designate how snow levels are calculated in that location; or
b. In the absence of specific ordinances, snow levels shall be calculated from the average monthly maximum depth of snow
accumulation as indicated by the National Weather Service's 10 year statistics for the installation location/geographical area.
In the Commonwealth of Massachusetts and as Required by State and Local Codes:
• The vented gas fueled appliance shall not be installed so its combustion, ventilation, or dilution air is obtained from a bedroom or bathroom.
• Signage: Whenever any through-the-wall (horizontal or sidewall) vent is installed less than seven feet above the finished grade, a metal
or plastic identification plate shall be permanently mounted to the exterior of the building at a minimum height of eight feet above grade
directly in line with the exhaust vent terminal. The sign shall read, in print no less than 0.5 inches in size, "GAS VENT DIRECTLY BELOW.
KEEP CLEAR OF ALL OBSTRUCTIONS".
• Marking of Exhaust Vent and Intake Pipe: Piping used for ventilation, make-up, or combustion air intake shall be labeled as follows:
a. Throughout the entire developed length:
i. Labels must be placed every ten feet for exposed/visible piping; or
ii.Labels must be placed every three feet for concealed piping.
b. At all changes of direction;
c. On each side of a penetration through a partition, wall or ceiling; and
d. The labels shall be black lettering that:
i. Indicates that the piping is used for ventilation, make-up, or combustion air intake, and
ii.The letters shall be sized equal to a minimum of the pipe diameter. However, for piping with a diameter exceeding two inches,
said lettering does not need to be larger than two inches.
WARNING
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AP18733 REV. 3.2.17