46
ways use a pipe compound resistant to the action of lique-
fied petroleum gases on all threaded connections.
IMPORTANT:
When making gas pipe connections, use a
back-up wrench to prevent any twisting of the main gas
valve and manifold. Do not overtighten gas valve on pipe.
Any strains on the gas valve can change the position of
the gas orifices in the burners. This can cause erratic fur-
nace operation.
IMPORTANT:
Do not run a flexible gas connector inside
the furnace. The gas pipe gasket in the cabinet does not
seal around a flexible gas line.
If local codes allow the use of a flexible gas appliance
connector, always use a new listed connector. Do not use
a connector which has previously serviced another gas
appliance. Massachusetts law requires that all flexible
connectors be less than 36”.
It is important to have all openings in the cabinet
burner compartment sealed for proper furnace opera-
tion.
IMPORTANT:
ENSURE that the furnace gas valve is not
to be subjected to high gas line supply pressures.
DISCONNECT the furnace and its individual manual gas
stop from the gas supply piping during
any pressure test-
ing that exceeds 1/2 PSIG. (3.48 kPa).
Natural gas supply pressure must be 5" to 10.5" w.c.
LP gas supply pressure must be 11" to 13" w.c.
This
pressure must be maintained with all other gas-fired
appliances in operation.
The minimum gas supply pressure to the gas valve for
proper furnace input adjustments is 5" w.c. for natural gas,
GAS SUPPLy
GAS PRESSURE
TABLE 11
NATURAL GAS PIPE CAPACITy TABLE (CU. FT./HR.)
Capacity of gas pipe of different diameters and lengths in cu. ft. per hr. with pressure drop of 0.3 in. and specific gravity of
0.60 (natural gas).
Nominal Length of Pipe, Feet
Iron Pipe
Size, Inches 10 20 30 40 50 60 70 80
1/2 132 92 73 63 56 50 46 43
3/4 278 190 152 130 115 105 96 90
1 520 350 285 245 215 195 180 170
1-1/4 1,050 730 590 500 440 400 370 350
1-1/2 1,600 1,100 890 760 670 610 560 530
After the length of pipe has been determined, select the pipe size which will provide the minimum cubic feet per hour re-
quired for the gas input rating of the furnace. By formula:
Gas Input of Furnace (BTU/HR)
Cu. Ft. Per Hr. Required
=
Heating Value of Gas (BTU/FT
3
)
The gas input of the furnace is marked on the furnace rating plate. The heating value of the gas (BTU/FT
3
) may be determined
by consulting the local natural gas utility or the LP gas supplier.
!
CAUTION
ELEVATIONS ABOVE 2000 FT. REqUIRE THAT THE
FURNACE INPUT RATING BE ADJUSTED AND
THAT THE SIzE OF THE BURNER ORIFICES BE RE-
CALCULATED BASED ON ELEVATION AND GAS
HEATING VALUE. THE BURNER ORIFICES MAy (OR
MAy NOT) NEED TO BE CHANGED. SEE THE SEC-
TION TITLED “HIGH ALTITUDE INSTALLATIONS”
OF THIS BOOk FOR INSTRUCTIONS.
Ga
s S
up
pl
y
FIGURE 31
ST-A1194-88-00
ST-A1194-89-00
FIGURE 32
Содержание (-)98VA060M317USA
Страница 12: ...Field Conversions FIELD CONVERSIONS 12 ...
Страница 13: ...FIELD CONVERSIONS Field Conversions 13 SEE NExT PAGE FOR APPLICABLE CONFIGURATIONS ...
Страница 15: ...Field Conversions 15 ...
Страница 16: ...Field Conversions ST A1194 68 00 16 ...
Страница 17: ...Field Conversions 17 ...
Страница 18: ...Field Conversions 18 ...
Страница 43: ...43 CONDENSATE DRAIN CONDENSATE DRAIN DRAIN NEUTRALIzER cont Condensate Drain FIGURE 29 ST A1194 70 00 ...
Страница 86: ...86 Timing Diagram TIMING DIAGRAM TABLE 16 TIMING DIAGRAM FOR A CALIBRATION GAS HEAT SEqUENCE ST A1240 03 00 ...
Страница 87: ...87 TIMING DIAGRAM TABLE 17 TIMING DIAGRAM FOR NON CALIBRATION GAS HEAT SEqUENCE Timing Diagram ST A1240 04 00 ...
Страница 92: ...92 Diagnostics TABLE 19 R98V FAULT CODES WITH DESCRIPTIONS AND SOLUTIONS ...
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Страница 105: ...105 FIGURE 67 MODULATING ECM FURNACE WIRING DIAGRAM Troubleshooting ...
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