Lp Conversion - Trane Oxbox 14 Seer Series Installation Instructions Manual

Table 4-1: Natural gas pipe capacity table
(CFH - Cubic Feet of Gas Per Hour)
Equivalent length of pipe (ft.)
Nominal iron
pipe size (in.)
10 20
1/2 132 92
3/4 278 190
1 520 350
1-1/4 1050 730
1-1/2 1600 1100
After determining the pipe length, select the pipe size which will
provide the minimum cubic feet per hour required for the gas input
rating of the furnace. By formula:
Furnace input (BTU/HR)
CFH=
Heating Value of Gas (BTU/Cubic Foot)
The gas input of the furnace is marked on the furnace rating plate.
The heating value of the gas (BTU/Cubic FT) may be determined by
consulting the local natural gas utility or the L.P. gas supplier.
Table 4-2: LP gas pipe capacity table (CFH - Cubic Feet of Gas Per Hour)
Nominal iron
pipe size (in.)
10
1/2 275
3/4 567
1 1071
1-1/4 2205
1-1/2 3307
2 6221
Example (LP): Input BTU requirement of unit, 150000
Equivalent length of pipe, 60 ft. =3/4" IPS r
Temperature sensor
Igniter
Burner Box
Burner
30 40 50 60 70
73 63 56 50 46
152 130 115 105 96
285 245 215 195 180
590 500 440 400 370
890 760 670 610 560
20 30 40
189 152 129 114
393 315 267 237
732 590 504 448
1496 1212 1039 913
2299 1858 1559 1417
4331 3465 2992 2646
Flame sensor
Orifice
Fig. 4-2 Burner and Gas Valve Arrangement

4.2 LP CONVERSION

This unit is equipped at the factory for use on Natural Gas only.
80
Conversion to LP Gas requires a special kit which is included with
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the unit. DO NOT BURN ANY LIQUID FUEL OR SOLID FUEL IN
THIS UNIT. Burning any unapproved fuel will result in damage to
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this unit heat exchanger, which could result in fire, Carbon
170
Monoxide poisoning, explosion, personal injury,
damage or death.
350
530
Convert the valve to use liquefied petroleum (LP) gas by replacing the
pressure regulator spring with the conversion kit spring. This LP kit
spring allows the regulator to maintain the proper manifold pressure
for LP gas. The correct burner LP orifices are included in the kit.
NOTE: The LP conversion kit is included with the unit. See
Conversion Kit Index shipped with unit for proper LP kit number.
Furnace conversion to LP gas must be performed by a qualified
technician.
Equivalent length of pipe (ft.)
50 60 70 80
103 96 89
217 196 182
409 378 346
834 771 724
1275 1181 1086
2394 2205 2047
WARNING
90 100 125 150
83 78 69
173 162 146 132
322 307 275 252
677 630 567 511
1023 976 866 787
1921 1811 1606 1496
on/off Lever
Gas Valve
Inlet
Gas Manifold
installation & owner's manual
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