Install Instructions

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CHAPTER 6
CHAPTER 6 - GAS PIPING
Table 1 - Gas Piping Sizing - Natural Gas
Length of Pipe in Feet
Capacity of Schedule 40 Metallic Pipe in Cubic Feet of Natural Gas Per Hour (based
on 0.60 specific gravity, 0.30” w.c. pressure drop)
SCH 40 1/2” 3/4” 1” 1-1/4” 1-1/2”
10 132 278 520 1050 1600
20 92 190 350 730 1100
30 73 152 285 590 890
40 63 130 245 500 760
50 56 115 215 440 670
75 45 93 175 360 545
100 38 79 150 305 460
150 31 64 120 250 380
6.2. Natural Gas
6.2.1 Pipe Sizing
Refer to Table 1 below for schedule 40 metallic pipe
length and diameter requirements for natural gas,
based on rated PRESTIGE Excellence input (divide by
1,000 to obtain cubic feet per hour).
• Table 1 below is based on Natural Gas with a spe-
cic gravity of 0.60 and a pressure drop through the
gas piping of 0.30”w.c..
• For additional gas pipe sizing information, refer to
National Fuel Gas Code (NFPA 54 / ANSI Z223.1)
for installations in the U.S. or CAN/CSA B149.1 for
installations in Canada.
6.2.2 Supply Pressure Requirements
1. Pressure required at the gas valve inlet supply pres-
sure port:
• Maximum 13”w.c. at ow or no ow conditions
to the burner.
• Minimum 5”w.c. during ow conditions to the
burner. Must be veried during start up and
with all other gas appliances operating within
the building.
2. Install 100% lockup gas pressure regulator in the
gas supply line if inlet pressure can exceed 13”w.c
at any time. Adjust the lockup pressure regulator
for 13”w.c maximum.
DO NOT adjust or attempt to measure gas
valve outlet pressure. The gas valve is facto-
ry-set for the correct outlet pressure. This set-
ting is suitable for natural gas and propane
and requires no field adjustment. Attempts
by the installer to adjust or measure the gas
valve outlet pressure can result in damage to
the valve, causing substantial property dam-
age, serious injury, or death.
The natural gas orifice requirements are:
• PRESTIGE Excellence 110: 0.242” (6.15 mm)
•
The PRESTIGE Excellence is factory equipped
with the required natural gas orifice. The nat-
ural gas orifice must never be modified or re-
placed with a different size orifice. Failure to
use the required natural gas orifice can result
in substantial property damage, serious injury,
or death.
WARNING
NOTICE
WARNING