Gas Supply Piping - HELIX VX-399 Installation, Operation & Maintanance Manual

FIGURE 7-1 Gas Connection (at top of Boiler)
Gas Connection
Top of Boiler
1"NPT
Gas Shutoff
Valve
NOTICE
Use two (2) wrenches when tightening boiler
fittings and pipes. Boiler's internal piping can be
damaged if subjected to excessive torque.

7 - GAS SUPPLY PIPING

• Do not try to light any appliance.
• Do not touch any electrical switch; do not use
any phone in your building.
• Immediately call your gas supplier from a
neighbor's phone. Follow gas supplier's
instructions.
• If you cannot reach your gas supplier, call the
fire department.
7.1 General
• Use piping materials and joining methods acceptable
to authority having jurisdiction. In absence of such
requirements:
• USA - National Fuel Gas Code, ANSI Z223.1/NFPA
54
• Canada - Natural Gas and Propane Installation Code,
CAN/CSA B149.1
Gas Valve
• Size and install gas piping system to provide sufficient
gas supply to meet maximum input at not less than
minimum supply pressure. See Table 8.
• Support piping with hooks straps, bands, brackets,
hangers, or building structure components to prevent
or dampen excessive vibrations and prevent strain on
gas connection. Boiler will not support piping weight.
• Use thread (joint) compound (pipe dope) suitable for
liquefied petroleum gas.
7.2 Conversion Kit Instructions
• See Gas Conversion Kit Instructions included with
Boiler.
Table 8 - Gas Supply Pressure
MODEL
399
Note: See Glossary - Piping Table 16
29
!
CAUTION
WHAT TO DO IF YOU SMELL GAS
Gas Supply Pressure
Natural Gas
Min. Max.
3.0" w.c. 13.5" w.c.
(0.7 kPa) (3.3 kPa)
Propane
Min. Max.
5.0" w.c. 13.5" w.c.
(1.2 kPa) (3.4 kPa)
P/N 240010943, Rev. C [09/07/2016]