Installation Manual

Demand Duo™ H-Series Installation and Operation Manual 44
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 must be chemically compatible
and mechanically suitable to be used in
liquified petroleum gas (LPG/Propane)
applications.
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 tankless water heater installation and
operation manual.
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.
Gas
Valve
Union
Figure 47