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Topics in this section
• Connect the Gas Supply
• Gas Operating Instructions
• Gas Pipe Sizing Reference Tables
• Connect Electricity
• Pump Controller
• Checklist for Gas and Electricity
WARNING
• A licensed professional must install the gas
supply.
• Turn off 120v power supply.
• Turn off the gas.
• Gas is flammable. Do not smoke or provide
other ignition sources while working with gas.
• Do not turn on the water heater or gas until
all fumes are gone.
Figure 17
The gas swivel and gas
flex line can move in
multiple directions for
installation.
Demand Duo™ R-Series Installation and Operation Manual
Gas Connection
(3/4 in. MNPT)
MUST DO
• A gas valve must be placed in the gas supply
line to the water heater. Flex line provided with
the appliance can be used as a union.
• Check the type of gas and the gas inlet
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 unit to match the gas type.
• 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.
• Before placing the appliance in operation, all
joints including the water heater and gas flex
must be checked for gas tightness by means
of leak detector solution, soap and water, 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.)
• Use approved connectors to connect the unit
to the gas line. Purge the gas line of any
debris before connection to the water heater.
• Any compound used on the threaded joint of
the gas piping shall be a type which resists the
action of liquefied petroleum gas (propane/
LPG).
• 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.
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