Carrier 59MN7B Installation, Start-Up, Operating And Service And Maintenance Instructions page 16

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.
FORMED END
OF GROMMET
CUT FORMED END OFF
CONDENSATE DRAIN
ELBOW
CONNECT SHORT END OF
'Z' PIPE TO MODIFIED
DRAIN ELBOW
FACTORY SUPPLIED
1/2 IN. CPVC TO 3/4 IN.
PVC ADAPTER
TOP VIEW
DRAIN ELBOW "Z" DISCHARGE PIPE FOR LEFT SIDE
DRAIN IS ROUTED BEHIND INDUCER
FORMED END OF GROMMET. OPEN
SPRING CLAMP, INSERT 1/2 IN. TO 3/4 IN.
CPVC TO PVC ADAPTER OR CPVC PIPE
MODIFIED DRAIN ELBOW CON-
NECT TO CONDENSATE TRAP
AND 'Z' PIPE
FRONT VIEW
LEFT SIDE DRAIN PIPE ORIENTATION FOR CONDENSATE DISCHARGE
NOTE: Remove Inducer Housing for easier access, if desired.
Fig. 13 - - Drain Trap Connection and Routing
(Appearance may vary)
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. 14.
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
DO NOT DISCARD THE FORMED
Fig. 14.
GROMMET OR THE RUBBER ELBOW. Both of
these pieces will be used.
ATTACH ELBOW TO
CONDENSATE TRAP
Assemble and route the drain line to the opposite side of the
furnace as detailed below:
A170128
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.
16
Fig. 14 - - Modify Rubber Drain Elbow
5. Remove the knock-out from the left side of the casing. See
Fig. 15 for suggested knockout removal technique.
6. From the outside of the casing, insert the angled end of the
Z-pipe through drain hole in the left side of the casing and
behind the inducer or gas valve. Allow the Z-pipe to
temporarily rest on the blower shelf (upflow) or burner box
(downflow). (NOTE: When the inducer housing has been
removed to ease installation in upflow applications, this
step is not needed.)
7. After inserting the Z- -pipe through the casing, slide a spring
clamp over each end of the Z- -pipe.
8. From inside the casing, insert the short end of the formed
grommet cut from the rubber drain elbow through the
7/8-in. drain knockout in the casing.
9. Pull the grommet through the casing from the outside until
it is seated in the knockout.
10. Align the Z-pipe with the long end of the grommet inside
the furnace and insert slightly. The angled end of the tube at
the other side of the casing should be facing the front of the
furnace.
11. Slide a spring clamp over the end of the remaining rubber
drain elbow.
12. Attach the drain elbow to the angled end of Z-pipe and the
drain trap outlet stub. Adjust the length of Z-pipe inserted
into the grommet at the opposite side of the furnace as
necessary for proper fit and positioning. In both upflow and
downflow orientations, the Z-pipe should NOT be resting
on any sheet metal parts.
13. Secure the rubber elbow to the drain trap and the Z-pipe
with spring clamps.
14. Secure the grommet to the Z-pipe with the spring clamp.
15. 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.
A11581