Reznor UEAS Unit Installation Manual - Manual (Page 8)

All piping must be in accordance with requirements outlined in the National Fuel
Gas Code ANSI Z223.1/NFPA 54 (latest edition) or CSA-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) 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 specifications, con-
sult 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.
7.0 Mechanical
Sizing Gas Supply Line
7.1 Gas Piping and
Pressure
7.1.1 Gas Supply
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.
WARNING
This appliance is equipped for a maximum gas supply
pressure of 1/2 psi, 3.5 kPa, or 14 inches water column.
Supply pressure greater than 1/2 psi 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.
7.1.2 Gas Connection
Leak-test all connections by brushing on a leak-detecting solution.
Gas Connection
Size
inches
130, 180 1/2
260, 310 3/4
Install a ground joint union and a manual shutoff valve upstream of the unit control
system as shown in FIGURE 5. Installation of a trap with a minimum 3” (76mm)
drip leg is required. he unit is equipped with a nipple that extends outside the cabi-
net. The gas connection is either 1/2” or 3/4”.
Form I-UEAS, Page 8