Reznor LDAP, Installation Operation & Maintenance

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16 LDAP-IOM (01-22) 207733-A
INSTALLATION—CONTINUED
Piping Connections—Continued
Gas Supply Piping
⚠ DANGER ⚠
• 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.
• The combination gas valve is the prime safety shutoff. All gas supply lines must be free of dirt
or scale before connecting the heater to ensure positive closure.
• Pipe joint compounds (pipe dope) shall be resistant to the action of liquefied petroleum gas or
any other chemical constituents of the gas being supplied.
•
All piping must be in accordance with requirements outlined in the National Fuel Gas Code ANSI/Z223 .1 (latest
edition) .
• Gas supply piping installation shall conform with good practice and with local codes .
•
Support gas piping with pipe hangers, metal strapping, or other suitable material . Do not rely on the heater to
support the gas pipe .
• The heater is orificed for operation with natural gas having a heating value of 1,000 (±50) BTU per cubic foot or
with propane gas having a heating value of 2,500 (±100) BTU per cubic foot . Sizing of gas supply lines depends
on piping capacity and is based on cubic feet per hour based on a 0 .3 IN WC pressure drop, a 0 .6 specific gravity
for natural gas at 1,050 BTU per cubic feet, and a 1 .6 specific gravity for propane at 2,550 BTU per cubic feet . If
the gas at the installation does not meet this specification, consult the factory for proper orificing .
•
Variables for sizing gas supply lines are listed in
Table 7
. When sizing supply lines, consider possibilities of future
expansion and increased requirements . Refer to National Fuel Gas Code for additional information on line sizing .
Table 7. Gas Supply Line Sizes
Length of
Pipe (Feet)
Diameter of Pipe (Inches)
1 1-1/4 1-1/2 2 2-1/2
Natural
Gas
Propane
Natural
Gas
Propane
Natural
Gas
Propane
Natural
Gas
Propane
Natural
Gas
Propane
Cubic Feet per Hour
20 350 214 730 445 1100 671 2100 1281 3300 2013
30 285 174 590 360 890 543 1650 1007 2700 1647
40 245 149 500 305 760 464 1450 885 2300 1403
50 215 131 440 268 670 409 1270 775 2000 1220
60 195 119 400 244 610 372 1105 674 1850 1129
70 180 110 370 226 560 342 1050 641 1700 1037
80 170 104 350 214 530 323 990 604 1600 976
90 160 98 320 195 490 299 930 567 1500 915
100 150 92 305 186 460 281 870 531 1400 854
125 130 79 275 168 410 250 780 476 1250 763
150 120 73 250 153 380 232 710 433 1130 689
175 110 67 225 137 350 214 650 397 1050 641
200 100 61 210 128 320 195 610 372 980 598
Supply Piping Connections
⚠ CAUTION ⚠
IMPORTANT: Two pipe wrenches are required when installing gas piping. The gas pipe that is
supplied with the heater MUST be held with a pipe wrench to prevent damage to the heater.