INSTALLATION INSTRUCTIONS
Gas Furnace: (F/G)9MVE
18
440 01 4400 03
Specifications subject to change without notice.
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
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
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
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. 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 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.
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
) 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 elbow.
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 horizontal sections of drain line.
