18
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.
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.
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.
16. 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.
17. 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.
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.
The field
−
supplied, accessory horizontal drain trap grommet is
ONLY REQUIRED FOR DIRECT VENT APPLICATIONS.
It is NOT required for applications using single
−
pipe or
ventilated combustion air venting.
NOTICE
TIP FROM CONTRACTORS
: When installing the furnace
horizontally, use the entire drain elbow (that is, do NOT cut as
shown in Fig. 16 to connect the trap to the drain line. This helps to
prevent bumps and shocks to the drain line from damaging the
furnace drain trap. Avoid misalignment of the drain pipe which
may cause kinks in the elbow.
Horizontal Orientation
1. The condensate trap outlet extends 2
−
in. (51 mm) below the
furnace casing. Leave enough clearance between the furnace
and the furnace platform for the trap.
2. To allow for servicing the trap, the condensate drain elbow
in the loose parts bag can be used to make a coupler to
allow for future service of the condensate trap and drain
line.
3. Remove the knock-out for the condensate trap in the side of
the casing.
4. Install the drain trap grommet in the casing if required for
direct
−
vent applications. If necessary, remove the trap,
install the grommet and re-install the trap.
5. Remove the pre-formed rubber drain elbow, and two spring
clamps from the loose parts bag.
6. Connect the full or modified elbow and/or grommet to the
outlet of the condensate trap with one spring clamp. Avoid
misalignment of the drain pipe which may cause kinks in
the elbow or grommet.
7. 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.
8. Install the adapter or connect the 1/2
−
in. CPVC pipe by
sliding a spring clamp over the open end of the elbow or
grommet on the outside the furnace casing.
9. 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.
10. 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.
Allow
at
least
1/4
in.
per
foot
(20
mm
per
meter
)
of
slope
down
and
away
from
the
furnace
in
hori
z
ontal
sections
of
drain
line.
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.
CAUTION
!
L12F019B
Fig. 12
−
Knockout Removal
912S
