HTP phoenix plus PHP199-119, Installation, Start-Up, And Operating Instructions Manual, Page: 40 / 56

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LP-454 REV. 1.6.15
PART 7 – GAS CONNECTIONS
Failure to follow all precautions could result in fire, explosion, severe injury or death!
Ensure the gas on which the water heater will operate is the same type specified on the rating plate. Failure to do so could result in
water heater malfunction, property damage, serious personal injury, or death.
The gas supply shall have a maximum inlet pressure of less than 14" water column
(350 mm), ½ pound pressure (3.5 kPa), and a minimum of 3.5" water column. The
entire piping system, gas meter and regulator must be sized properly to prevent
pressure drop greater than 0.5" WC as stated in the National Fuel Gas Code. This
information is listed on the rating plate.
It is very important that you are connected to the type of gas as noted on the rating
plate: "LP" for liquefied petroleum, propane gas, or "Nat" for natural or city gas. All gas
connections must be approved by the local gas supplier or utility, in addition to the
governing authority, prior to turning the gas supply on.
Do not remove the adaptor in
Figure 24
! It is mandatory that this fitting is used for
connection to a field fabricated drip leg per the National Fuel Gas Code. You must
ensure that the entire gas line to the connection at the water heater is no smaller than
¾".
Once all inspections have been performed, the piping must be leak tested. If the leak
test requirement is a higher test pressure than the maximum gas inlet pressure, you
must isolate the heater from the gas line to continue leak testing. To do this, you must
turn off the factory and field-installed gas cocks. This will minimize the possibility of
damaging the gas valve. Failure to do so may damage the gas valve. In the event the
gas valve is exposed to a pressure greater than ½ PSI, 14" water column, the gas
valve must be replaced. Never use an open flame (match, lighter, etc.) to check gas
connections.
NOTE: A drip leg is installed inside the water heater. Local codes may require a visible drip leg installed outside of the water heater.
UL recognized fuel gas detectors are recommended in all enclosed propane and natural gas applications where there is a potential for
an explosive mixture of fuel gas to accumulate. The installation of these detectors should be made in accordance with the detector
manufac
turer’s recommendations, and/or local laws. Failure to install fuel gas detectors in these applications could result in fire,
explosion, property damage, severe personal injury, or death.
A. GAS PIPING
Run the gas supply line in accordance with all applicable codes. Locate and install manual shutoff valves in accordance with local and
state requirements.
Support gas supply piping with hangers, not by the heater or its accessories. The heater gas valve and blower will not support the
weight of the piping. Make sure the gas piping is protected from physical damage and freezing, where required. Failure to follow these
instructions could result in gas leakage, and result in fire, explosion, property damage, severe personal injury, or death.
Do not use Teflon tape on gas line pipe thread. Use a pipe compound rated for use with natural and propane gases. Apply sparingly on
male pipe ends, leaving the two end threads bare. Failure to follow these instructions could result in gas leakage, and result in fire,
explosion, property damage, severe personal injury, or death.
B. GAS TABLE
Refer to the table below to size the supply piping to minimize pressure drop between meter or regulator and unit.
Maximum capacity of pipe in cubic feet of gas per hour for gas pressures of .5 psi or less and a pressure drop of .3 inch water column.
Figure 24
– Gas Connection