Ducane CMP A Series Installation Instructions Manual page 10

Flue Pipe Installation:
NOTE: Make sure of alignment and fit, before gluing pieces
in place!
To Install With Right Flue Exit:
1. Remove the large diameter knockout in the right-side panel of
the furnace wrapper.
2. Using 2" diameter PVC (ABS or CPVC) pipe, install a short
piece of pipe in the outlet of the vent coupling (Figure 1.10).
The pipe should be long enough to leave approximately one
inch (1") protruding out of the right side of the furnace. The
2" tee supplied in the vent/drain kit is then attached to this
pipe as shown in Figure 2.9.
3. On the models 50 and 75U3, the 2" diameter vent pipe fittings
will connect directly to the top of the tee installed in step 2.
On the models 75U2 and 75U3A the 2" to 2-1/2" adapter
(supplied) and on Models 100 and 125, the 2" to 3" adapter
(supplied) will connect to the top of the tee. The 2 1/2"
(models 75U2 and 75U3A) or the 3" (models 1(30and 125)
vent pipe will connect to the adapter. Mounted adapters must
allow condensate to flow to drain tee.
4. After proving alignment of parts and fit, glue all the joints.
To Install With Left Flue Exit:
I. Remove the large diameter knockout in the left-side panel of
the furnace wrapper that is closest to the front of the unit.
Relocate pressure switch assembly as required (Figure 1.1(3).
2. Remove vent coupling from PVC inducer starter. Connect a
2" diameter PVC (or ABS) street elbow directly onto PVC
inducer starter. If size permits substitution of a short piece of
2" diameter PVC (or ABS) pipe and standard elbow may be
substituted for the street elbow. Install this first elbow
pointing up and toward the front of the unit (Figure 1.10).
The vent coupling must then be relocated to the optional
location as shown in Figure 1.10.
3. Insert a 3 W' long piece of pipe into the vent coupling, and
connect to a second elbow. The second elbow should face
toward the left side of the unit.
4. Cut a piece of 2" pipe that is long enough to insert through the
knockout (from step 1) and be inserted into the second elbow
in step 3, leave approximately one inch (1") protruding out of
the left side of the fairnace. This piece of pipe will pass over
the top of the combustion air blower motor, and in front of the
combustion air blower housing. The 2" tee supplied in the
vent/drain kit is then attached to this pipe as shown in Figure
2.9.
5. On the models 50 and 75U3, the 2" diameter vent pipe fittings
will connect directly to the top of the tee installed in step 4.
On the models 75U2 and 75U3A the 2" to 2-1/2" adapter
(supplied) and on Models 100 and 125, the 2" to 3" adapter
(supplied with the unit) will connect to the top of the tee. The
2 1/2" (models 75U2 and 75U3A) or the 3" (models 100 and
125) vent pipe will connect to the adapter.
6. Provide slope toward 2" tee for drainage (Figure 1.10).
7. After proving alignment of parts and fit, glue all the joints.
Figure 1.10 VENT ROUTING
NO'g'E
SLOp£ TO
DP_IN.
Vent
_LOC_'E
PKESS_£
/-SNITCK
TO FIE_E.
Optional
Vent
Cou#Ing
To "Convert" from Upflow to Horizontal (Left) Airflow:
,This furnace is shipped for installation in the upflow
configuration, but may be installed in a horizontal right-to-left
airflow direction. The only change needed to "convert" to the
horizontal position is to remove the plastic cap on the auxiliary
drain connection in the combustion air blower. Attach tubing to
both drain connections and tee together. (See Figure 2.10) The
tubing must always slope downward and make sure the tubing does
not sag.
Figure 2.10 HORIZONTAL LEFT CONDENSATE TUBING
cAP
T0o /
_TUBE
NOTE: A material list and more detailed instructions are included
in the vent/drain package located in the vestibule of this
furnace.
Filters:
Air filters must be used in every installation. For side return
installations, air filters must be installed external to the furnace
casing. An external filter rack kit with filter (parts No. 20069901
for 50,000 - 100,000 sizes and 20069902 for 125,000 size) is
available as an optional accessory.
20246506 Issue 9939 Page 10 of 22