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Topics in this section
• Connect the Gas Supply
• Connect Electricity
• Pump Controller
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 47
Demand Duo
H-Series with SENSEI CX Installation Instructions
The gas swivel and gas
flex line can move in
multiple directions for
installation.
To connect the gas supply, follow the instructions
below:
1. 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 (Figure 48 on the
following page).
2. 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.
3. 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 Section "3.2
Specifications" with all gas appliances
operating. 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.)
4. 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.
5. 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.
6. 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.
7. 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.
43
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