Gas Valve - Rheem 97MDV060 Series Installation Instructions Manual

NEVER PURGE A GAS LINE INTO THE COMBUS-
TION CHAMBER. NEVER USE MATCHES, FLAME
OR ANY IGNITION SOURCE FOR CHECKING LEAK-
AGE. FAILURE TO ADHERE TO THIS WARNING CAN
CAUSE A FIRE OR EXPLOSION RESULTING IN
PROPERTY DAMAGE, PERSONAL INJURY OR
DEATH.
TO CHECK FOR GAS LEAKAGE, USE AN AP-
PROVED CHLORIDE-FREE SOAP AND WATER SO-
LUTION, OR OTHER APPROVED METHOD.

GAS VALVE

This furnace has a 24-volt gas valve. It has ports for
measuring supply and manifold gas pressure. The valve
body contains a pressure regulator to maintain proper
manifold gas pressure.
A control switch is on the valve body. It can be set to only
the "ON" or "OFF" positions. The gas valve is a slow-
opening valve. See Figure 32.
When energized, it takes 2 to 3 seconds to fully open.
W RNING
1. 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 MANUFAC-
TURER'S WARRANTY. CONTACT THE SUPPLIER
TO MAKE SURE FERTILIZER IS NOT USED IN THE
SAME TANKS USED TO STORE AND DELIVER LP
GAS.
TABLE 12
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
Example (LP): Input BTU requirement of unit, 120,000
10 20 30 40
1/2 275 189 152 129
3/4 567 393 315 267
1 1,071 732 590 504
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
Equivalent length of pipe, 60 ft. = 3/4" IPS required.
2. NOTE: Order the correct LP conversion kit from the
furnace manufacturer. Furnace conversion to LP gas
must be performed by a qualified installer, service
agency or the gas supplier.
3. All 34 90+ Modulating Gas Furnaces installed at high
elevations above 5,000 ft. require the installation of a
high altitude kit that includes a new model data card for
proper operation.
NOTE: High altitude operation is limited to a maximum
altitude of 8,000 ft.
All gas piping must comply with the latest NFPA 54
National Fuel Gas Code and all state and local codes.
All electrical wiring must comply with the latest NFPA
70, National Electrical Code and all state and local
codes.
Be sure to check the fuel code of your furnace. The
fuel code is adjacent to the serial number. See the LP
conversion kit index that came with your furnace to
determine the correct LP conversion kit.
4. All altitudes use a 1.10mm orifice. The unique 2% de-
rate requirement per 1000 ft. allows the lower baro-
metric pressure to meet this requirement.
Length of Pipe, Feet
50 60 70 80 90
114 103 96 89 83
237 217 196 182 173
448 409 378 346 322
913 834 771 724 677
1,417 1,275 1,181 1,086 1,023
2,646 2,394 2,205 2,047 1,921
100 125 150
78 69 63
162 146 132
307 275 252
630 567 511
976 866 787
1,811 1,606 1,496
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