Double Deck J4PG4 Installation Manual

WARNING
This unit is equipped at the factory for use on Natural Gas only.
Conversion to LP Gas requires a special kit which is included with
the unit. DO NOT BURN ANY LIQUID FUEL OR SOLID FUEL IN
THIS UNIT. Burning any unapproved fuel will result in damage to
this unit heat exchanger, which could result in fire, Carbon
Monoxide poisoning, explosion, personal injury, property
damage or death.
Table 4-1: Natural gas pipe capacity table
(CFH - Cubic Feet of Gas Per Hour)
Table 4-2: LP gas pipe capacity table (CFH - Cubic Feet of Gas Per Hour)
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:
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.
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.
Example (LP): Input BTU requirement of unit, 150000
Equivalent length of pipe, 60 ft. =3/4″ IPS r
4.2 LP CONVERSION
10 20 30 40 50 60 70 80
1/2 132 92 73 63 56 50 46 43
3/4 278 190 152 130 115 105 96 90
1 520 350 285 245 215 195 180 170
1-1/4 1050 730 590 500 440 400 370 350
1-1/2 1600 1100 890 760 670 610 560 530
Nominal iron
pipe size (in.)
Equivalent length of pipe (ft.)
CFH=
Furnace input (BTU/HR)
Heating Value of Gas (BTU/Cubic Foot)
10 20 30 40 50 60 70 80 90 100 125 150
1/2 275 189 152 129 114 103 96 89 83 78 69 63
3/4 567 393 315 267 237 217 196 182 173 162 146 132
1 1071 732 590 504 448 409 378 346 322 307 275 252
1-1/4 2205 1496 1212 1039 913 834 771 724 677 630 567 511
1-1/2 3307 2299 1858 1559 1417 1275 1181 1086 1023 976 866 787
2 6221 4331 3465 2992 2646 2394 2205 2047 1921 1811 1606 1496
Nominal iron
pipe size (in.)
Equivalent length of pipe (ft.)
Fig. 4-2 Burner and Gas Valve Arrangement
19
plug-in for reduing NOx content
* The above figure for reference purpose only.