20
b. The top of the chimney is sealed and
weatherproofed.
c. The termination clearances shown in
Figure 17 are maintained.
d. No other gas fired or fuel burning
appliances are vented through the
chimney.
Vent Freezing Protection
When the vent pipe is exposed to temperatures
below freezing, i.e., when it passes through
unheated spaces, chimneys, etc., the pipe must
be insulated with 1/2 inch thick sponge rubber
insulation, Armaflex-type insulation or equiva-
lent. Insulating pipe is important to avoid con-
densate icing.
For extremely cold climates or for conditions of
short furnace cycles (i.e. set back thermostat
conditions) the last three feet of vent pipe can be
reduced one nominal pipe size provided that the
total vent length is at least 15 feet in length and
the vent is sized in accordance with the venting
requirements (Table 4) before this reduction is
applied. (Example: 3” to 2-1/2”) Smaller vent
pipes are less susceptible to freezing, but must
not be excessively restrictive.
Concentric Vent Termination
A concentric vent termination is approved for
use with these furnaces. The kit part number is
904176. For proper installation of the concentric
vent termination, follow the installation instruc-
tions provided with that kit.
DRAINAGE OF CONDENSATE
FROM FURNACE
The condensate drainage system is internal to
the furnace. It is not recommended to connect
additional traps to the exterior of the furnace.
Doing so will have adverse effects on the
operation of the furnace. The drain may exit
either the right or left side of the furnace cabinet.
The condensate drain can be routed to a flow
drain or to a condensate pump. Ensure that the
drain maintains a downward slope from the unit
to the drain. Refer to Figure 18 for more details.
For a right side drain simply extend the tubing out
of the hole in the cabinet, see Figure 18. For a
left side drain follow the steps below:
1.
Loosen the clamp on the soft exit tube (see
Figure 18.)
2.
Rotate the soft exit tube (counter clock-
wise, 180° upflow models; clockwise 90°
downflow models.)
3.
Re-tighten the clamp. MAKE SURE CLAMP
IS TIGHT TO AVOID LEAKAGE OF CON-
DENSATE.
4.
Route the tubing out of the hole located 8
inches up from the bottom furnace.
The condensate should drain from the plastic
collector box (location A in Figure 18) as drop-
lets or a small stream. If you notice the furnace
has operated for more than 5 minutes without
36" max.
18" min.
Exhaust Vent
Option B
Exhaust Vent
Option A
Exhaust Vent
Option C
Mounting Kit
Faceplate Secured
to Wall with Screws
18" Min.
36" Max.
7" Min.
8" Min.
12" Min. to
Normal Snow Level
Combustion
Air Inlet
Grade
Level
or Normal
Snow
Inlet Exhaust
18" Min.
36" Max.
Figure 16. Exhaust and Combustion Air Pipe Clearances
