Delta PG PLUS-25 Operations Instructions download pdf (Page 44)

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.

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

i n j u r y, death or substantial pro p e rt y

damage.

WARNING

Length of Pipe

in Feet

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

Capacity of Pipe in Cubic Feet of Gas Per Hour

(based on 0.60 specific gravity, 0.30" w.c. pressure drop)

Table 3: Gas piping sizing - Natural Gas

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 ... 75 76

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Delta PG PLUS-25 Operations Instructions Page 44

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