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Form I-CAUA, P/N 164771 R8, Page 7

TABLE 4 -

Sizing a Gas

Supply Line

Capacity of Piping - Cubic Feet per Hour based on 0.3" w.c. Pressure Drop

Specic Gravity for Natural Gas -- 0.6 (Natural Gas -- 1000 BTU/Cubic Ft)

Specic Gravity for Propane Gas -- 1.6 (Propane Gas -- 2550 BTU/Cubic Ft)

Length Diameter of Pipe

of 1/2" 3/4" 1" 1-1/4" 1-1/2" 2"

Pipe Natural Propane Natural Propane Natural Propane Natural Propane Natural Propane Natural Propane

20' 92 56 190 116 350 214 730 445 1100 671 2100 1281

30' 73 45 152 93 285 174 590 360 890 543 1650 1007

40' 63 38 130 79 245 149 500 305 760 464 1450 885

50' 56 34 115 70 215 131 440 268 670 409 1270 775

60' 50 31 105 64 195 119 400 244 610 372 1105 674

70' 46 28 96 59 180 110 370 226 560 342 1050 641

80' 43 26 90 55 170 104 350 214 530 323 990 604

90' 40 24 84 51 160 98 320 195 490 299 930 567

100' 38 23 79 48 150 92 305 186 460 281 870 531

125' 34 21 72 44 130 79 275 168 410 250 780 476

150' 31 19 64 39 120 73 250 153 380 232 710 433

175' 28 17 59 36 110 67 225 137 350 214 650 397

200' 26 16 55 34 100 61 210 128 320 195 610 372

Note: When sizing supply lines, consider possibilities of future expansion and increased requirements.

Refer to National Fuel Gas Code for additional information on line sizing.

Gas Piping

Requirements and

Connection

Pipe joint compounds (pipe dope) shall be resistant to the action of liqueed

petroleum gas or any other chemical constituents of the gas being supplied.

Install a ground joint union and manual shutoff valve upstream of the unit control

system as shown in FIGURE 2. The 1/8" plugged tapping in the shutoff valve pro-

vides connection for a supply line pressure test gauge. The National Fuel Gas Code

requires the installation of a trap with a minimum 3" (76mm) drip leg. Local codes may

require a minimum drip leg longer than 3", typically 6" (152mm). Bleed gas lines of

trapped air.

Gas connection is either 1/2" or 3/4" depending on size and type of gas (See TABLE

5).

Leak-test all connections by brushing on a leak-detecting solution.

TABLE 5 - Gas

Connection (not supply

line size)

FIGURE 2 - Supply

Piping Connection

WARNING

All components of a gas supply system must be leak tested prior to placing equipment in service.

NEVER TEST FOR LEAKS WITH AN OPEN FLAME. Failure to comply could result in personal injury,

property damage or death.

CAUA

Sizes

Fuel

Gas

Connection

150-

200

Natural

Gas

1/2"

250-

400

3/4"

150-

400

Propane 1/2"

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Gas Valve

The main operating gas valve is powered by the 24-volt control circuit through the

thermostat and safety controls. The main control valve is of the diaphragm type pro-

viding regulated gas ow preset at the factory.

WARNING:

The operating valve is the prime safety shutoff. All gas supply lines must be free of dirt or scale

before connecting the unit to ensure positive closure. See Hazard Levels, page 2.

1 2 3 4 5 6 7 8 9 10 11 12 ... 43 44

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