508148-01
Issue 2128
Page 47 of 75
Condensate Piping
This unit is designed for either right- or left-side exit of
condensate piping in upflow applications. In horizontal
applications, the condensate trap must extend below the
unit. An 8” service clearance is required for the condensate
trap. Refer to Figure 41 and Figure 42 for condensate trap
locations. Figure 49 and Figure 50 show trap assembly
using 1/2” PVC or 3/4” PVC.
NOTE:
If necessary the condensate trap may be installed
up to 5’ away from the furnace. Use PVC pipe to connect
trap to furnace condensate outlet. Piping from furnace
must slope down a minimum of 1/4” per ft. toward trap.
Figure 41. Condensate Trap and Plug Locations
(unit shown in upflow position)
NOTE:
In upflow applications where side return air filter is installed
on same side as the condensate trap, filter rack
MUST
be installed
beyond condensate trap or trap must be relocated to avoid
interference.
(Unit shown in upflow position with remote trap)
*5’ max.
To Drain
PVCPipeOnly
FieldProvidedVent
Min. 1” AboveCondensate
DrainConnection
1” Min.
2” Max.
Trap can be installed a
maximum 5' from furnace
*Piping from furnace must slope down a minimum of
1/4” per ft. toward trap.
Figure 42. Condensate Trap Locations
1.
Determine which side condensate piping will exit the
unit, location of trap, field-provided fittings and length
of PVC pipe required to reach available drain.
2. For furnaces with a 1/2” drain connection use a 3/8
allen wrench and remove plug (Figure 41) from the
cold end header box at the appropriate location on the
side of the unit. Install field-provided 1/2 NPT male
fitting into cold end header box. For furnaces with
a 3/4” drain connection use a large flat head screw
driver or a 1/2” drive socket extension and remove
plug. Install provided 3/4 NPT street elbow fitting into
cold end header box. Use Teflon tape or appropriate
pipe dope.
3.
Install the cap over the clean out opening at the base
of the trap. Secure with clamp. See Figure 49 and
4.
Install drain trap using appropriate PVC fittings, glue
all joints. Glue the provided drain trap as shown in
Figure 49 and Figure 50. Route the condensate line to
an open drain. Condensate line must maintain a 1/4”
downward slope from the furnace to the drain.
When combining the furnace and evaporator coil
drains together, the A/C condensate drain outlet must
be vented to relieve pressure in order for the furnace
pressure switch to operate properly.
IMPORTANT
5.
Figure 44 and Figure 45 show the furnace and
evaporator coil using a separate drain. If necessary
the condensate line from the furnace and evaporator
coil can drain together. See Figure 47 through Figure
Upflow furnace (Figure 44) -
In upflow furnace
applications the field provided vent must be a minimum
1” to a maximum 2” length above the condensate drain
outlet connection. Any length above 2” may result in a
flooded heat exchanger if the combined primary drain
line were to become restricted.
Horizontal furnace (Figure 45) -
In horizontal furnace
applications the field provided vent must be a minimum
4” to a maximum 5” length above the condensate drain
outlet connection. Any length above 5” may result in a
flooded heat exchanger if the combined primary drain
line were to become restricted.
NOTE:
In horizontal applications it is recommended to
install a secondary drain pan underneath the unit and
trap assembly.
NOTE:
Appropriately sized tubing and barbed fitting
may be used for condensate drain. Attach to the drain
