Page 38
31-5000726 Rev. 0
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 37 and Figure 38 for condensate trap
locations. Figure 45 and Figure 46 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 37. Condensate Trap and Plug Locations
(unit shown in upflow position)
Plug
(same on
left side)
Trap
(same on
right 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.
(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 38. 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.
Use a large flat head screw driver or a 1/2” drive
socket extension and remove plug (Figure 37) from
the cold end header box at the appropriate location
on the side of the unit. 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 45 and
Figure 46.
4.
Install drain trap using appropriate PVC fittings, glue
all joints. Glue the provided drain trap as shown in
Figure 45 and Figure 46. 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 40 and Figure 41 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 43 through Figure
44.
Upflow furnace (Figure 40) -
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 41) -
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
on the trap using a hose clamp. See Figure 39.
