Reznor EEDU Unit Installation Manual Uživatelský manuál stáhnout pdf (Strana 9)

Form I-EEDU, P/N 150492 R6, Page 9

6.0 Mechanical

This appliance is equipped for a maximum gas supply pressure of

1/2 psi, 3.4 kPa, or 14 inches water column. NOTE: Supply pressure

higher than 1/2 psi requires installation of an additional service regulator

external to the unit.

PRESSURE TESTING SUPPLY PIPING

Test Pressures Above 1/2 PSI: Disconnect the heater and manual valve from the gas

supply line which is to be tested. Cap or plug the supply line.

Test Pressures Below 1/2 PSI: Before testing, close the manual valve on the heater.

6.1 Gas Piping and

Pressures

6.1.1 Gas Supply and Connections

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

of Pipe

Diameter of Pipe

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

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.

Sizing Gas Supply

Lines

All piping must be in accordance with requirements outlined in the National Fuel Gas

Code ANSI/Z223.1 (latest edition) or CSA-B149.1 and B149.2 (See Paragraph 1.4).

Gas supply piping installation should conform with good practice and with local codes.

Duct furnaces for natural gas are oriced for operation with gas having a heating value

of 1000 (± 50) BTU per cubic ft. If the gas at the installation does not meet this speci-

cation, consult the factory for proper oricing.

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 sys-

tem, as shown in FIGURE 8. The 1/8" plugged tapping in the shutoff valve provides

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

the installation of a trap with a minimum 3" drip leg. Local codes may require a mini-

mum drip leg longer than 3" (typically 6").

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FIGURE 8 - Supply Piping Connection

Gas Connection to

Single-Stage Valve

(Not Gas Supply Line Size)

Unit Size 75-250 300-400

Natural Gas 1/2" 3/4"

Propane 1/2" 1/2"

NOTE: To permit burner removal, this nipple

must extend beyond the edge of the heater.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 31 32

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