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2. Install a manual gas control valve in the gas supply line
to the water heater. A union can be used on the
connection above the shut off valve for the future
servicing or disconnection of the water heater (see right
image)
3. Check the type of gas and gas supply pressure before
connecting the water heater. If the water heater is not
of the gas type that the building is supplied with, DO
NOT connect the water heater. Contact the dealer for
the proper water heater to match the gas type.
4. Check the gas supply pressure immediately upstream at
a location provided by the gas company. Supplied gas
pressure must be within the limits shown in the
Specifications section with all gas appliances operating.
5. Before placing the appliance in operation, all joints
including the heater must be checked for gas tightness
by means of soap, gas leak detector solution, or an
equivalent nonflammable solution, as applicable. (Since
some leak test solutions, including soap and water, may
cause corrosion or stress cracking, the piping shall be
rinsed with water after testing, unless it has been
determined that the leak test solution is non-corrosive.)
6. Use approved connectors to connect the water heater to
the gas line. Purge the gas line of any debris before
connection to the water heater.
7. Any compound used on the threaded joint of the gas
piping shall be a type that resists the action of liquefied
petroleum gas (propane/LPG).
8. The gas supply line shall be gas tight, sized, and so
installed as to provide a supply of gas sufficient to meet
the maximum demand of the heater and all other gas
consuming appliances at the location without loss of
pressure. If in doubt about the size of the gas line, refer
to the Installation and Operation Manual for Commercial
CU199 Condensing Tankless Water Heaters.
9. Perform a leak and pressure test prior to operating the
water heater. If a leak is detected, do not operate the
water heater until the leak is repaired.
42
Rinnai Commercial Hybrid System Installation and Operation Manual
Gas
Valve
Union
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