Instinct Installation Manual

CHAPTER 7 - GAS PIPING
30
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WARNING
WARNING
7.2. Natural Gas
7.2.1 Pipe Sizing
Refer to Table 2 below for schedule 40 metallic pipe
length and diamet er r equir ements f or natural gas ,
based on rated INSTINCT input (divide by 1,000 to
obtain cubic feet per hour).
• Table 1 is based on Natural Gas with a specific
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.
7.2.2 Supply Pressure Requirements
1. Pressure required at the gas valve inlet supply
pressure port:
• Maximum 13”w.c. at flow or no flow conditions
to the burner.
• Minimum 5”w.c. during flow conditions to the
burner. Must be verified 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 factory-set for
the correct outlet pressure. This setting 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 damage, serious injury, or death.
The INSTINCT is factory equipped with the required
natural gas venturi. The natural gas venturi must
never be modified or replaced with a different size
venturi. Failure to use the required natural gas
venturi can result in substantial property damage,
serious injury, or death.
Table 1 - Natural Gas Venturis
Model Venturi Diameter Bottom Injector Top injector Label Colour Part No.
110 Solo
22mm
NG Ø3.40 mm
NG Ø3.50 mm
White
INSRKIT07
155 Solo
24mm
NG Ø3.90 mm
NG Ø3.95 mm
White
INSRKIT09
199 Solo
26mm
NG Ø5.00 mm
NG Ø4.20 mm
White
INSRKIT11
155 Combi
24mm
NG Ø3.90 mm
NG Ø3.95 mm
White
INSRKIT09
199 Combi
26mm
NG Ø5.00 mm
NG Ø4.20 mm
White
INSRKIT11
Table 2 - 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
CHAPTER 7