HTP ELP-199 - Manual (Page 42)

42
LP-294 REV. 2.20.14
PART 6 – GAS PIPING
FAILURE TO FOLLOW ALL PRECAUTIONS IN THIS SECTION
COULD RESULT IN FIRE, EXPLOSION, OR DEATH!
A. GAS CONNECTION
The gas supply shall have a maximum inlet pressure of less than
13" 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.
The gas connection for the ELP-110 and ELP-199
is 3/4”. 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 boiler is no smaller than the sup-
plied connection.
Once all inspections have been performed, the piping must be
leak tested. If the leak test requirement is a higher test pres-
sure than the maximum inlet pressure, you must isolate the
boiler 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, 13" w.c. (3.23 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 boiler 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 boiler.
Failure to apply pipe sealing compound as detailed above could result in substantial property damage, severe personal injury, or death.
Never use an open flame (match or lighter) to check for gas leaks. Use a soapy solution to test connection. Failure to use a soapy
solution test or check gas connection for leaks can result in substantial property damage, severe personal 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
boiler or its accessories. Failure to follow this warning could result
in gas leakage, substantial property damage, severe personal
injury, or death.
Figure 22 – Gas Supply Piping
Table 17 – Gas Table – Pipe Size / BTUs per hour