508034-02
Issue 2135
Page 33 of 49
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 43 and Figure 44 for condensate trap
locations. Figure 51 (3/4” drain connection) and NO TAG
(1/2” drain connection) show trap assembly using 1/2”
PVC or 3/4” PVC.
(Unit shown in upflow position)
Trap
(same on
right side)
Plug
(same on
left side)
1-1/2 in.
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.
Figure 43. Condensate Trap and Plug Locations
(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 44. Condensate Trap Locations
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.
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 43) 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.
NOTE:
Cold end header box drain plugs are factory
installed. Check the unused plug for tightness to
prevent leakage.
3. Install the cap over the clean out opening at the base
of the trap. Secure with clamp. See Figure 51 or NO
TAG.
4.
Install drain trap using appropriate PVC fittings, glue
all joints. Glue the provided drain trap as shown in
Figure 51 or NO TAG. Route the condensate line to
an open drain. Condensate line must maintain a 1/4”
downward slope from the furnace to the drain.
5. Figure 49 and Figure 47 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 48 through Figure
Upflow furnace (Figure 48) - 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 50) - 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
