Lp Conversion - Rheem (-)802PA050314MSA Installation Instructions Manual

NOTE: The valve can be converted to use liquified 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. See
Figure 21.
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.
NOx MODELS
When converting furnaces equipped with NOx inserts to LP gas,
remove the NOx insert assemblies. Steps for removal are listed
below:
1. Turn off all electrical power and the gas supply to the furnace.
2. Remove the burner door from the furnace.
3. Remove the burner assembly – handle with care.
4. Remove the two screws attaching the NOx insert retainer
bracket to the center panel and remove NOx inserts.
5. Put the two screws back into the holes in the center panel.
6. Re-install the burner assembly.
7. Replace burner door.
8. Turn on electrical power and gas supply to the unit.
NOTE: Some NOx models may have one less NOx insert.
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.
TABLE 7
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
Iron Pipe
Size, Inches 10 20 30
1/2 275 189 152
3/4 567 393 315
1 1,071 732 590
1-1/4 2,205 1,496 1,212 1,039
1-1/2 3,307 2,299 1,858 1,559
2 6,221 4,331 3,465 2,992
Example (LP): Input BTU requirement of unit, 120,000
Equivalent length of pipe, 60 ft. = 3/4" IPS required.

LP CONVERSION

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 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.
FIGURE 21
TYPICAL LP KIT CONTENTS
Length of Pipe, Feet
40 50 60 70 80
129 114 103 96 89
267 237 217 196 182
504 448 409 378 346
913 834 771 724
1,417 1,275 1,181 1,086 1,023
2,646 2,394 2,205 2,047 1,921
90 100 125 150
83 78 69 63
173 162 146 132
322 307 275 252
677 630 567 511
976 866 787
1,811 1,606 1,496
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