Rheem 801C Series, Installation Instructions Manual

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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 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.
LP CONVERSION
LP Conversion
NOTE: The valve can be converted to use liquified petro-
leum (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 fur-
nace manufacturer . Furnace conversion to LP gas must
be performed 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
elevation:
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 op-
eration and manifold pressure .
5 . Attach the notice label alerting the next service techni-
cian that the furnace has been converted to LP gas .
!
WARNING
LP TANKS FROM LOCAL LP SUPPLIER MUST NOT
BE USED TO STORE ANYTHING (SUCH AS FER-
TILIZER) EXCEPT LP GAS . THIS INCLUDES ALL
DELIVERY VESSELS (LP TRUCKS) . IF MATERIAL
OTHER THAN LP GAS IS USED IN THE SAME VES-
SELS/TANK AS THE LP GAS, THE LP GAS CAN
BECOME CONTAMINATED AND DAMAGE THE
FURNACE . THIS WILL VOID THE MANUFACTUR-
ER’S WARRANTY. CONTACT THE SUPPLIER TO
MAKE SURE FERTILIZER IS NOT USED IN THE
SAME TANKS USED TO STORE AND DELIVER LP
GAS .
GAS PRESSURE
FIGURE 21
TYPICAL LP KIT CONTENTS