International comfort products N9MSB Installation Instructions Manual page 17

INSTALLATION INSTRUCTIONS
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 of the furnace casing.
8. Open the spring clamp and insert the long end of the
adapter of the 1/2−in. CPVC pipe into the outlet stub on
the drain elbow.
9. Connect additional
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.
Figure 12 Example of Field Drain Attachment
TIPS FROM CONTRACTORS: Contractors have found that
temporarily removing the
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 Figure 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 Figure 13. DO NOT DISCARD THE FORMED
GROMMET OR THE RUBBER ELBOW. Both of these
pieces will be used.
Assemble and route the drain line to the opposite side of the
furnace as detailed below:
5. Remove the knock−out from the left side of the casing.
(See Figure 13 for
technique.)
440 01 4101 03
condensate piping to
OPEN STAND
PIPE FOR
A/C OR
HUMIDIFIER
DRAIN
TEE
TO OPEN
DRAIN
A11276
inducer assembly in upflow
suggested knockout removal
Specifications subject to change without notice.
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.
a
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 elbow.
17. Connect additional
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.
NOTICE
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.
TIPS FROM CONTRACTORS: When installing the furnace
horizontally, use the entire drain elbow (that is, do NOT cut as
shown in Figure 14) 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.
Gas Furnace: N9MSB, N9MSE
condensate piping to a
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