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(914098) or VentilAire
TM
IV (914229) fresh air supply
system. Alternate
means for providing
ventilation
air
must meet the requirements
of all applicable local and
federal codes.
For downflow
models, a special mounting bracket is
supplied with the furnace for installation of the VentilAire
TM
supply air system. The bracket is installed on the right
hand side at the top of the cabinet, as shown in Figure
31. The bracket can be secured to the unit using the self-
drilling screws supplied with the kit. Please follow the
instructions provided with the kit.
For upflow models, the means for providing the required
ventilation must be incorporated into the upflow furnace
base or the return air ductwork to the furnace.
Vent Couplings (Figure 32)
M4 series furnaces require couplings to be installed over
the combustion air finish flange and where the vent pipe
exits the furnace cabinet. NOTE: These couplings are not
supplied in the *RL extra parts bag
Each coupling must be secured to the finish flange
or vent pipe with a hose clamp (if using neoprene
couplings).
Upflow furnaces
require the 3" neoprene coupling
clamps to be installed above the coil box.
Upflow Furnaces:
Combustion
air and exhaust vent piping must have
removable connections between the furnace flanges and
vent pipes when installed vertically in front of the coil box.
NOTE: Both vent pipes must be long enough to clear the
height of the coil box when installed. This allows for future
servicing or maintenance of the coil.
Position the 2"x 3" neoprene coupling between the top of
the 2" vent pipe and the 3" vent pipe. Secure both ends
of the couplings with hose clamps, ensuring that the
connection is tight and leak free.
3" PVC Pipes --_L
3" Neoprene
Couplings
[i
Coil Box
I'
2"x3"
IF1
Neoprene
_ _,,,.
Couplings
_
o
UPFLOW
FURNACE
3" PVC Pipes._
2" x 3"
Neoprene
Couplings
--_'_
DOWNFLOW
FURNACE
Figure 32. Vent Couplings
Downflow Furnaces
Since there is no coil box above the furnace, both 3" vent
pipes can be run vertically for the entire length of the
pipes from the 2"x 3" coupling to the outdoors. Secure
both ends of the couplings, ensuring that the connection
is tight and leak free.
Alternate Vent Pipe Installation
When running the 2" PVC pipe out through the top of the
*RC upflow furnace, there may be possible clearance
issues when transitioning the PVC pipe from 2" to 3".
To increase the size of the PVC flue from 2" to 3",
you may use two, 2"x 45 ° PVC elbows to achieve the
clearances needed between the coil box and the 2"x
3" neoprene coupling. See Figure 33.
Install the 2"x 3" neoprene coupling in the vertical run
only. If the coupling is installed horizontally, it will allow
water to build up inside the furnace and cause a lock
out condition.
3" vent pipes
2" x
Neoprene
Couplings
Coil Box
2" Neoprene
,1
2" PVC
Pipe
45o PVC
Elbow
Figure 33. Alternate vent Pipe Installation
23
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