SYSTEM OPERATION
8
COMBUSTION AIR INTAKE PIPE OPTIONS:
The RF000142 coupling can be secured directly to the
furnace intake coupling if condensation is occurring in the
combustion air inlet pipe. If the RF000142 is used on the
combustion air inlet, it must be installed with the arrow
pointing up. It should be noted, the combustion air will
actually be moving in a direction opposite of the arrow on the
RF000142 coupling.
Alternatively a tee may be used in the combustion air
intake pipe for the same purpose. If either option is used,
a field supplied trapped drain tube, free-draining to proper
condensate disposal location must be present. A loop in the
drain tube can serve as a trap. The unused RF000142 drain
fitting should be capped.
1. Remove screws from vent flange.
2. Remove internal elbow and vent pipe.
3. Cut pipe 2 1/2” from flange.
4. Remove cabinet plug adjacent to inducer outlet and
install an original cabinet vent hole.
5. Install RF000142 coupling on inducer outlet.
6. Install flanged vent section removed in step 2 and se
-
cure with clamps.
7. Secure flange to cabinet using screws removed in step
1.
Insert flange. Cut 2 ½” long.
R 000142
F
GAS SUPPLY AND PIPING
The furnace rating plate includes the approved furnace gas
input rating.
CAUTION
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Inlet gas supply pressures must be maintained within the
ranges specified below. The supply pressure must be constant
and available with all other household gas fired appliances
operating. The minimum gas supply pressure must be
maintained to prevent unreliable ignition. The maximum must
not be exceeded to prevent unit overfiring.
INLET GAS SUPPLY PRESSURE
Natural Gas
Minimum: 4.5" w.c. Maximum: 10.0" w.c.
GAS VALVE
This unit is equipped with a 24 volt gas valve controlled during
furnace operation by the integrated control module. Taps for
measuring the gas supply pressure and manifold pressure
are provided on the valve.
NOTE: The gas supply pressure on White-Rodgers “J”
model gas valve, used on single stage furnaces, can be
checked with a gas pressure test kit (Part #0151K00000S)
available through our authorized distributors.
The gas valve has a manual ON/OFF control located on
the valve itself. This control may be set only to the “ON” or
“OFF” position. Refer to the
Lighting Instructions Label
or the
“Putting the Furnace Into Operation”
section of this manual or
the installation instructions for use of this control during start
up and shut down periods.
Length of
Nominal Black Pipe Size
Pipe in Feet
1/2"
3/4"
1"
1 1/4"
1 1/2"
10
132
278
520
1050
1600
20
92
190
350
730
1100
30
73
152
285
590
980
40
63
130
245
500
760
50
56
115
215
440
670
60
50
105
195
400
610
70
46
96
180
370
560
80
43
90
170
350
530
90
40
84
160
320
490
100
38
79
150
305
460
CFH =
Natural Gas Capacity of Pipe
In Cubic Feet of Gas Per Hour (CFH)
(Pressure 0.5 psig or less and pressure drop of 0.3" W.C.; Based on 0.60
Specific Gravity Gas)
BTUH Furnace Input
Heating Value of Gas (BTU/Cubic Foot)
