21
Air gap here
Open standpipe
LQKLJK
PLQLPXP
for coil
or
humidifier drain
TEE
(1/2” CPVC to 3/4” PVC
adapter from loose parts bag.)
To open drain
&RLORUKXPLGLILHUGUDLQ
ZKHQXVHG
+
+
+
Condensing
Furnace
-
-
- -
-
ÄÄÄÄÄÄÄÄÄÄ
ÄÄÄÄÄÄÄÄÄÄ
ÄÄÄÄÄÄÄÄÄÄ
ÄÄÄÄÄÄÄÄÄÄ
ÄÄÄÄÄÄÄÄÄÄ
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Evaporator Coil
+ + +
< +
< +
< +
+
Blower
-
3/4” PVC
3/4
3/4
3/4
3/4
+
= Positive pressure
< +
= Pressure lower than areas with
+
ï
= Negative pressure
+
3/4” PVC
DIRECT
IO
N
OF
AIRF
LO
W
+
+
+
3/4
Open standpipe
LQKLJKPLQLPXP
Air gap required when
another drain is connected
to furnace drain.
+
TEE
(1/2” CPVC to 3/4” PVC
adapter from loose parts bag.)
+
+
+
Condensing
Furnace
ï
ï
ï ï
ï
Evaporator Coil
+
+
+
< +
< +
< +
+
Blower
ï
3/4” PVC
3/4
1/2”
CPVC
or
larger*
+
= Positive pressure
< +
= Pressure lower than areas with
+
( = Negative pressure
+
3/4” PVC
DIRECTION
OF
AIRFLOW
+
+
+
+
3/4
3/4
3/4
3/4
Open standpipe
(Optional when coil drain is
not connected to furnace
drain.)
Recommend “T” fitting
standpipe of same
diameteror larger
H[WHQGLQJXSZDUG
ZLWKPLQLPXPLQFK
high
+
+
+
Condensing
Furnace
-
-
- -
-
Evaporator
ÄÄÄÄÄÄÄÄÄ
Coil
ÄÄÄÄÄÄÄÄÄ
+
ÄÄÄÄÄÄÄÄÄ
+
ÄÄÄÄÄÄÄÄÄ
+
ÄÄÄÄÄÄÄÄÄ
ÄÄÄÄÄÄÄÄÄ
+
ÄÄÄÄÄÄÄÄÄ
< +
< +
< +
+
Blower
-
3/4” PVC
3/4
3/4
3/4
3/4
3/4
3/4
+
= Positive pressure
< +
= Pressure lower than areas with
+
ï
= Negative pressure
3/4” PVC
Open standpipe
(Optional when coil drain is
not connected to furnace
drain.)
TEE
(1/2” CPVC to 3/4” PVC
adapter from loose parts bag.)
DIRECTION
OF
AIRFLOW
A170135
Fig. 18 -- Example of Field Drain Attachment
INSTALLATION
Cabinet air leakage is less than 2% at 1.0 in. W.C. Cabinet air
leakage is less than 1.4% at 0.5 in. W.C. when tested in accor-
dance with ASHRAE Standard 193.
NOTICE
Upflow Installation
NOTE:
The furnace must be pitched as shown in Fig. 21 for
proper condensate drainage.
Supply Air Connections
For a furnace not equipped with a cooling coil, the outlet duct shall
be provided with a removable access panel. This opening shall be
accessible when the furnace is installed and shall be of such a size
that the heat exchanger can be viewed for possible openings using
light assistance or a probe can be inserted for sampling the air
stream. The cover attachment shall prevent leaks.
Connect supply--air duct to flanges on furnace supply--air outlet.
Bend flange upward to 90
_
with wide duct pliers. See Fig. 19.
The supply--air duct must be connected to ONLY the furnace
supply--outlet--air duct flanges or air conditioning coil casing
(when used). DO NOT cut main furnace casing side to attach
supply air duct, humidifier, or other accessories. All supply--side
accessories MUST be connected to duct external to furnace main
casing.
