HTP EL-399NVWH - Manual (Page 42)

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LP- 346 REV. 3.20.14
PART 6 – GAS PIPING
FAILURE TO FOLLOW ALL PRECAUTIONS IN THIS SECTION WILL RESULT IN FIRE, EXPLOSION, OR DEATH!
A. GAS CONNECTION
The gas supply shall have a maximum inlet pressure of less than 14"
w.c. (3.5 kPa), and a minimum of 3.5" w.c. (.87 kPa). The entire piping
system, gas meter and regulator must be sized properly to prevent
pressure drop greater than 0.5" (.12 kPa) as stated in the National Fuel
Gas Code. This information is listed on the rating label.
It is very important that you are connected to the type of gas
noted on the rating plate. “LP” for liquefied petroleum, propane
gas, or “NAT” for natural or city gas. You must not do a gas
conversion without an approved gas conversion kit. Prior to
turning the gas on, all gas connections must be approved by the
local gas supplier or utility, in addition to the governing authority.
A gas conversion kit comes with the heater. Follow the included
instructions VERY carefully. Failure to follow gas conversion
instructions could result in property damage, serious injury, or
death.
The gas valve and blower will not support the weight of gas piping. Do not attempt to support the weight of piping with the heater or its
accessories. Failure to follow this warning could result in gas leakage, substantial property damage, severe personal injury, or death.
The gas connection on the heater
is 3/4” for the EL-80/110/150 and 1” for the EL-220/299/301/399. It is mandatory that this fitting is
used for connection to a field fabricated drip leg as shown in the illustration above per the National Fuel Gas Code. You must ensure
that the entire gas line to the connection at the heater is no smaller than the unit supplied connection.
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 inlet pressure, you must isolate the heater from the gas line. In order to do this, shut the gas off using factory and field-
installed gas cocks. This will prevent high pressure. 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" w.c. (3.5 kPa), the gas valve must be
replaced. Never use an open flame (match, lighter, etc.) to check gas
connections.
B. GAS PIPING
1. Run the gas supply line in accordance with all applicable codes.
2. Locate and install manual shutoff valves in accordance with state and local
requirements.
3. In Canada, the Manual Shutoff must be identified by the installing
contractor.
4. It is important to support gas piping as the unit is not designed to
structurally support a large amount of weight.
5. Purge all gas lines thoroughly to avoid start up issues with air in the lines.
6. Sealing compound must be approved for gas connections. Care must be
taken when applying compound to prevent blockage or obstruction of gas flow
which may affect the operation of the unit.
Failure to apply pipe sealing compound as detailed above could result in substantial property damage, severe personal injury, or death.
Figure 22