Reznor LDAP Unit Installation Manual - Manual (Page 11)

Form I-LDAP, P/N 207733R6, Page 11
All piping must be in accordance with requirements outlined in the National
Fuel Gas Code ANSI/Z223.1a (latest edition) or CSA-B149.1 and B149.2 (See
Paragraph 1.4). Gas supply piping installation should conform with good prac-
tice and with local codes. Support gas piping with pipe hangers, metal strap-
ping, 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
1000 (± 50) BTU per cubic ft or propane gas with a heating value of 2500 (±
100) BTU per cubic ft. If the gas at the installation does not meet these speci-
fications, consult the factory for proper orificing.
Gas Connection Size 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.
Install a ground joint union and manual shutoff valve upstream of the heater
control system, as shown in FIGURE 6. Installation of a trap with a minimum 3”
(76mm) drip leg is required.
To connect the gas, the heater is equipped with a nipple that extends outside
the cabinet.
Leak-test all connections by brushing on a leak-detecting solution.
Gas Connection - inches/mm
Size
Natural
Gas
Propane
400
inches 1 1
mm 25.4 25.4
800
inches 1-1/4 1-1/4
mm 31.8 31.8
1200
inches 1-1/4 1-1/4
mm 31.8 31.8
Sizing Gas Supply
Line
Capacity of Piping - Cubic Feet per Hour based on 0.3” w.c. Pressure Drop
Specific Gravity for Natural Gas -- 0.6 (Natural Gas -- 1000 BTU/Cubic Ft)
Specific Gravity for Propane Gas -- 1.6 (Propane Gas -- 2550 BTU/Cubic Ft)
Length Diameter of Pipe
of 1” 1-1/4” 1-1/2” 2” 2-1/2”
Pipe Natural Propane Natural Propane Natural Propane Natural Propane Natural Propane
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
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.
WARNING: 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.
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.
NOTE: Gas
Conversion Kits are
available for changing
from propane to natural
gas or natural gas to
propane. A factory-
authorized conversion
kit MUST be used.
WARNING: The operating 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. See
Hazard Levels, page 2.