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74
LP Conversion
NOTE:
See Page 85 for Canadian High-Altitude
Derate.
The valve can be converted to use liquified petroleum (LP)
gas by replacing the pressure regulator spring with the con-
version kit spring. This LP kit spring allows the regulator to
maintain the proper manifold pressure for LP gas.
NOTE:
Order the correct LP conversion kit from the furnace
manufacturer. Furnace conversion to LP gas must be per-
formed by a qualified installer, service agency or the gas
supplier.
ORIFICE INSTALLATION
LP Gas is a manufactured gas that has consistent heating
value across most regions.
The Sea Level input should still be reduced by 4% per
thousand ft. and the orifice size must be selected based on
the reduced input selection chart in High Alt. Instruction
Section.
To change orifice spuds for either conversion to LP or for el-
evation:
1. Shut off the manual main gas valve and remove the
gas manifold.
2. Replace the orifice spuds.
3. Reassemble in reverse order.
4. Turn the gas supply back on and check for proper oper-
ation and manifold pressure.
5. Attach the notice label alerting the next service techni-
cian that the furnace has been converted to LP gas.
LP CONVERSION
FIGURE 38
TYPICAL LP KIT CONTENTS
TABLE 13
LP GAS PIPE CAPACITY TABLE (CU. FT./HR.)
Maximum capacity of pipe in thousands of BTU per hour of undiluted liquefied petroleum gases (at 11 inches water
column inlet pressure).
(Based on a Pressure Drop of 0.5 Inch Water Column)
Nominal Length of Pipe, Feet
Iron Pipe
Size, Inches 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 1,071 732 590 504 448 409 378 346 322 307 275 252
1-1/4 2,205 1,496 1,212 1,039 913 834 771 724 677 630 567 511
1-1/2 3,307 2,299 1,858 1,559 1,417 1,275 1,181 1,086 1,023 976 866 787
2 6,221 4,331 3,465 2,992 2,646 2,394 2,205 2,047 1,921 1,811 1,606 1,496
Example (LP): Input BTU requirement of unit, 120,000
Equivalent length of pipe, 60 ft. = 3/4" IPS required.
!
WARNING
LP TANKS FROM LOCAL LP SUPPLIER MUST NOT
BE USED TO STORE ANYTHING (SUCH AS FERTIL-
IZER) EXCEPT LP GAS. THIS INCLUDES ALL DELIV-
ERY VESSELS (LP TRUCKS). IF MATERIAL OTHER
THAN LP GAS IS USED IN THE SAME
VESSELS/TANK AS THE LP GAS, THE LP GAS CAN
BECOME CONTAMINATED AND DAMAGE THE FUR-
NACE. THIS WILL VOID THE MANUFACTURER’S
WARRANTY. CONTACT THE SUPPLIER TO MAKE
SURE FERTILIZER IS NOT USED IN THE SAME
TANKS USED TO STORE AND DELIVER LP GAS.
Summary of Contents for 92MSP SERIES
Page 34: ...34 Field Conversions ...
Page 35: ...35 Field Conversions ...
Page 36: ...36 Field Conversions ...
Page 37: ...37 Field Conversions ...
Page 38: ...Field Conversions 38 ...
Page 99: ...99 ...
Page 100: ...100 CM 0716 ...