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Upflow/Downflow Orientation
In the Upflow or Downflow orientation, the condensate trap is
inside the furnace casing. The condensate drain must be routed
from the trap through the furnace casing. The condensate drain can
be routed through the left or right side of the casing. (The left or
right side is as you are viewing/facing the furnace from the front.)
An indoor coil condensate drain or humidifier drain can be
connected to the external furnace condensate drain provided:
a. The drains are not hard piped together, and
b. There is an air gap at the point where the two drain lines
meet or
c. All condensate piping is at least 3/4-in. PVC and there is
a relief tee at the top of condensate drain piping as shown
in Fig. 12.
NOTE: On narrower casings, it may be easier to remove the
condensate trap, connect the drain line components and re-install
the condensate trap. Read the steps thoroughly to familiarize
yourself with the required steps.
For Right Side Condensate Drain:
1. Remove the 7/8- -in. knock- -out from the right side of the
casing. See Fig. 15 for suggested knockout removal tech-
nique.
2. Remove the pre- -formed rubber drain elbow and two spring
clamps from the loose parts bag.
3. Slide a spring clamp 1- -inch (25 mm) down the plain end
(the end without the formed grommet) of the drain elbow.
4. From inside the casing, insert the formed grommet end of
the elbow through the 7/8- -in. knockout in the casing.
5. Pull the grommet through the casing from the outside until
it is seated in the knockout
6. Attach the plain end of the drain elbow to the outlet stub on
the drain trap. Secure the drain elbow to the trap with the
spring clamp.
INSTALL CLAMPS ON DRAIN TUBE
ATTACH DRAIN TUBE TO CONDENSATE
DRAIN TRAP
PULL DRAIN STUB
THROUGH CASING
OPEN SPRING CLAMP
INSERT FACTORY SUPPLIED 1/2 IN. CPVC
TO 3/4 IN. PVC ADAPTER OR 1/2 IN. CPVC PIPE
*CLAMP MAY BE LOCATED ON OUTSIDE OF DRAIN
TUBE
Fig. 14 - - Formed Rubber Drain Grommet
The remaining drain line can be constructed from field supplied
1/2- -in. CPVC or 3/4- -in. PVC pipe, in compliance with local
building codes. A factory- -supplied 1/2- -in. CPVC to 3/4- -in. PVC
adapter is supplied in the loose parts bag for use as required.
7. Install the adapter or connect the 1/2- -in. CPVC pipe by
sliding a spring clamp over the open end of the grommet on
the outside the furnace casing.
8. Open the spring clamp and insert the long end of the
adapter or the 1/2- -in. CPVC pipe into the outlet stub on the
drain tube.
9. Connect additional condensate piping to a code- -approved
drain, or to a condensate pump approved for use with acidic
furnace condensate and compatible with mineral and
vegetable oils, such as canola oil.
!
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care
and wear appropriate protective clothing, safety glasses and
gloves when handling parts, and servicing furnaces.
Allow at least 1/4-in. per foot (20 mm per meter) of slope down
and away from the furnace in horizontal sections of drain line.
TIP FROM CONTRACTORS: Contractors have found that
temporarily removing the inducer assembly in upflow applications
while performing the steps, below, makes upflow left- -side drain
connections easier.
For Left Side Condensate Drain Connection:
1. For left side condensate drainage, the drain line is routed
from the condensate trap, behind the inducer (upflow) or
gas valve (downflow) and out through the left side of the
furnace casing. A pre-formed 1/2- -in. CPVC "Z-pipe" is
provided with the furnace. The Z-pipe is long enough to
extend across the casing for drain connections.
2. Locate the Z-pipe. Remove the pre-formed drain elbow and
four spring clamps from the loose parts bag.
3. The Z-pipe is connected to the condensate trap and the
outside of the furnace by modifying the formed rubber
drain elbow as shown in Fig. 16.
A11342A
Fig. 16 - - Modify Rubber Drain Elbow
4. Remove the formed grommet from the rubber drain elbow
by cutting the elbow along the vertical line located about
1- -3/8 in. (35 mm) away from the formed grommet. See Fig.
16. DO NOT DISCARD THE FORMED GROMMET
OR THE RUBBER ELBOW. Both of these pieces will be
used.
14
CAUTION
Fig. 15 - - Knockout Removal
L12F019B
A190401
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