Rheem GEN27WN Manuel D'installation page 11

CAUTION The supplied flexible gaseous pipe is not to
be installed underground or in contact with the ground.
• The entire flexible gaseous pipe must be visible for
periodic inspection and must not be concealed within nor
contact nor run through any wall, floor, or partition.
• Install the flexible, gaseous hose (supplied) between
the generator fuel inlet port and rigid piping to prevent
thermal expansion or contraction from causing
excessive stress on the piping material.
NOTE: Where local conditions include earthquake, tornado,
unstable ground, or flood hazards, special consideration
shall be given to increase strength and flexibility of piping
supports and connections.
• Piping must be of the correct size to maintain the
required supply pressures and volume flow under
varying generator load conditions with all gas
appliances connected to the fuel system turned on
and operating.
WARNING Propane and Natural Gas are extremely
flammable and explosive.
Fire or explosion can cause severe
burns or death.
• Before placing the generator into service, the fuel system
lines must be properly purged and leak tested.
• No leakage is permitted.
• Use a pipe sealant or joint compound approved for
use with NG/LPG on all threaded fittings to reduce the
possibility of leakage.
• Installed piping must be properly purged and
leak tested, in accordance with applicable codes
and standards.
Consider the following factors when planning to install the
fuel supply system:
• Air density is less at high altitudes, resulting in less
available engine power. See Power Decrease at High
Altitude or High Temperature in the operator's manual.
• A minimum of one accessible, approved manual shutoff
valve shall be installed in the fuel supply line within 6 ft
(1.8 m) of the residential generator. A union or flanged
connection shall be provided downstream from this
valve to permit removal of controls.
• Both LP vapor and natural gas fuel supply pressure
at the generator's fuel inlet port should be between
7 to 11 inches of water (in. W.C.) at full load with all
gas appliances turned on and operating.
The generator unit has been factory load tested to run on
either natural gas or LP vapor fuel. The unit can be converted
from natural gas to LP vapor or vice versa using two people
and special tools. See Fuel Conversion, later in this manual.
It is recommended that the fuel connection incorporate the
following components:
• A minimum 10 ft. (3 m) section of gas pipe between
the primary fuel regulator and the generator fuel inlet
connection (acts as accumulator for high block loads).
• A manual fuel shut-off valve located in the interior of
the building.
• A manual fuel shut-off valve located outside the
building, just before the generator unit.
• Where the formation of hydrates or ice is known to
occur, piping should be protected against freezing. The
termination of hard piping should include a sediment
trap where condensate is not likely to freeze.
• A manometer port should be provided.
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