Carrier 59SC2D Installation, Start-Up, Operating And Service And Maintenance Instructions page 13

Evaporator Coil
+
+
Condensing
Furnace
+
-
-
+ = Positive pressure
< + = Pressure lower than areas with +
− = Negative pressure
NOTICE
The field- -supplied, accessory horizontal drain trap grommet is
ONLY REQUIRED FOR DIRECT VENT APPLICATIONS.
It it NOT required for applications using single- -pipe or
ventilated combustion air venting.
NOTICE
The condensate trap extends below the side of the casing in
the horizontal position. A minimum of 2- -in. (51 mm) of
clearance is required between the casing side and the furnace
platform for the trap to extend out of the casing in the
horizontal position. Allow at least 1/4- -in. per foot (20 mm
per meter) of slope down.
Evaporator Coil
+ + +
Condensing
Furnace
+
+
Blower
-
-
+
3/4" PVC
+
+
+ +
3/4
+
3/4
+
+
3/4
+
1/2" CPVC or larger*
+
< +
< +
< +
3/4
-
1/2
+
Blower
-
1/2
- -
+
Fig. 13 - - Example of Field Drain Attachment (Not Allowed)
+ = Positive pressure
< + = Pressure lower than areas with +
+
+
+
− = Negative pressure
+ +
Blower creates positive pressure.
Positive pressure extends into coil
condensate drain (no trap).
+
< +
< +
< +
Furnace condensate does not flow
consistently when drain is at positive
-
+ pressure.
+
-
- -
+
+
Evaporator Coil
+
Open
standpipe
+
Condensing
3/4" PVC
Furnace
+
+
Blower
-
-
3/4
+ = Positive pressure
< + = Pressure lower than areas with +
− = Negative pressure
!
FROZEN AND BURST WATER PIPE HAZARD
Failure to protect against the risk of freezing may result in
property damage.
Special precautions MUST be made if installing furnace in an
area which may drop below freezing. This can cause improper
operation or damage to equipment. If furnace environment
has the potential of freezing, the drain trap and drain line must
be protected. The use of accessory drain trap heaters, electric
heat tape and/or RV antifreeze is required for these
installations.
13
+
3/4" PVC
+
+ +
3/4
+
3/4" PVC
3/4
+
+
+
3/4
1/2" CPVC or larger*
+
+
< +
3/4
< +
< +
+
+
-
+
+
3/4
-
+
- -
+
+ +
3/4
CAUTION
A14532