Delta PG PLUS-25 Natural GAS, Pipe Sizing Natural Gas, Natural Gas Supply Pressure Requirements

Gas Piping

NATURAL GAS

Pipe Sizing - Natural Gas

1.Refer to Table 3 for pipe length and diame- ter requirements. Based on rated PER- FORMANCE PLUS input (divide by 1,000 to obtain cubic feet per hour).

-Table 3 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 piping sizing infor- mation, refer to ANSI Z223.1. For Canadian installations refer to B149.1 or B149.2.

Natural Gas 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 condi- tions to the burner. Must be verified during start up and with all gas appli- ances operating.

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 lock- up pressure regulator for 13”w.c maximum.

WARNING

DO NOT adjust or attempt to measure gas valve outlet pressure. The gas valve is factory-set for the correct outlet pres- sure. 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 could result in damage to the valve, causing potential severe personal injury, death or substantial property damage.

Table 3: Gas piping sizing - Natural Gas

Length of Pipe		Capacity of Pipe in Cubic Feet of Gas Per Hour
in Feet	(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	860
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

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