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www.DaikinApplied.com
9
IM 970-2 • MAVERICK I ROOFTOP
LP Conversion
DANGER
This unit is equipped at the factory for use with natural gas only. Conversion
to LP gas requires a special kit supplied by the distributor or manufacturer.
Mailing addresses are listed on the furnace rating plate, parts list and
warranty. Failure to use the proper conversion kit can cause fire, carbon
monoxide poisoning, explosion, personal injury, property damage, or death.
NOTICE
To remove the gas valve, remove the four screws securing the manifold
pipe to the burner tray. Remove the manifold pipe with gas valve attached.
See
Figure 10
.
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. See
Figure 9
.
NOTE:
Order the correct LP conversion kit from the furnace
manufacturer. See Conversion Kit Index shipped with
unit for proper LP kit number. Furnace conversion to
LP gas must be performed by a qualified technician.
NOx Models
When converting units equipped with NOx inserts to LP gas,
the stainless steel screen mesh inserts in the entrance of the
tubular exchangers are not required to meet SCAQMD NOx
emission levels. These inserts and 1/8” diameter retaining rod
should be carefully removed before firing this furnace on LP
gas.
Important:
This furnace is not designed to operate on LP
gas with the NOx inserts in place.
Step by step instructions on removing the NOx inserts and
retaining rod are included in the Conversion Kit Installation
Instructions.
Table 4: LP Gas Pipe Capacity Table (Cu. Ft./Hr.)
Maximum capacity of pipe in thousands of BTU/hour of undiluted liquified
petroleum gases at 11 inches water column inlet pressure (Based on a
pressure drop of 0.5 inch water column).
Nominal
Iron Pipe
Size (in.)
Length of Pipe (ft.)
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
Example (LP):
Input BTU requirement of unit, 150,000
Equivalent lenght of pipe, 60 ft. = 3/4" IPS required
Figure 9: NOx Inserts
Figure 10: Manifold Pipe
Manifold Pipe
