Gas Supply Piping - Dunkirk Helix VX-050 Installation, Operation & Maintenance Manual

FIGURE 7-1A Gas Connection (at top of Boiler)
50/75/100 Shown
Attach Supplied Gas
Shutoff Valve (shown
in open position)
FIGURE 7-1B Gas Connection (at top of Boiler)
150/200 Shown
3/4"
Nipple
Gas
Connection
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

Gas
Connection
Attach Supplied Gas
Shutoff Valve (shown
in open position)
1/2"x 3/4"
Increaser
CAUTION
!
WHAT TO DO IF YOU SMELL GAS
• 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
• 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.
• Install manual main shutoff valve outside of jacket. See
figures 7-1A and 7-1B.
7.2 Conversion Kit Instructions
• See Gas Conversion Kit Instructions included with Boiler.
Table 8 - Gas Supply Pressure
Gas Supply Pressure
Natural Gas
MODEL
Min.
050
075
3.0" w.c.
100
(0.7 kPa)
150
200
Note: See Glossary - Piping Table 14
32
Propane
Max. Min.
13.5" w.c. 5.0" w.c.
(3.3 kPa) (1.2 kPa)
P/N# 240010618, Rev. E [07/2015]
Max.
13.5" w.c.
(3.4 kPa)