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Form RZ-NA I-UDA, P/N 195673 Rev 5, Page 12
Gas Connection (inches)
30 45 60 75 100 125 150 175 200 225 250 300 350 400
Natural 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 3/4 3/4 3/4 3/4 3/4
Propane 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 3/4 3/4 3/4 3/4 3/4
Gas Connection Size
WARNING: This appliance is equipped for a maximum gas
supply pressure of 1/2 pound, 8 ounces, or 14 inches water column.
Supply pressure higher than 1/2 pound requires installation of
an additional lockup-type service regulator external to the unit.
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.
12. Gas Piping
and
Pressures
All piping must be in accordance with requirements outlined in the National Fuel
Gas Code ANSI/Z223.1a (latest edition) or CAN/CGA-B149.1 and B149.2 (See
Paragraph 2). Gas supply piping installation should 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 1000
(± 50) BTUH per cubic ft or propane gas with a heating value of 2500 (± 100)
BTUH per cubic ft. If the gas at the installation does not meet these specifications,
consult the factory for proper orificing.
Pipe joint compounds (pipe dope) shall be resistant to the action of liquefied petro-
leum 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 10. Installation of a trap with a minimum 3" (76mm)
drip leg is required.
The unit is equipped with a nipple that extends outside the cabinet. The gas con-
nection is either 1/2” or 3/4”.
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 1/2" 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.
Sizing
Gas
Supply
Line
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.