HTP EFT-399 - Manual (Page 50)

50
LP-387 REV. 6.10.14
PART 7 – 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 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.
NOTE:
Maximum inlet gas pressure must not exceed 14” w.c. (3.5
kPa).
*NOTE: Installer must supply trap to meet local code requirements.
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 boiler. Follow the included
instructions VERY carefully. Failure to follow gas conversion
instructions could result in property damage, serious injury, or death.
Do not attempt to support the weight of gas piping with the boiler or its accessories. The gas valve and blower will not support the
weight of the piping. Failure to follow this warning could result in substantial property damage, severe personal injury, or death.
The gas connection on the boiler
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 boiler supplied 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, 14" w.c., or 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.
Table 14 – Gas Pipe Sizing / BTU’s per Hour
Figure 28 – Gas Line