F97CMN and G97CMN: Installation, Start-up, Operating and Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
13
L12F019B
Fig. 14 – Knockout Removal
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.
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
.
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.
A170128
Fig. 15 – Drain Trap Connection and Routing
(Appearance may vary)
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.
A11581
Fig. 16 – Modify Rubber Drain Elbow
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.
CAUTION
!
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.
