Page 48
31-5000723 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 36 and Figure 37 for condensate trap
locations. Figure 44 and Figure 45 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 36. Condensate Trap and Plug Locations
(Unit Shown in Upflow Position)
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.
(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 37. 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 45) 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.(Figure 44)
3.
Install the cap over the clean out opening at the base of
the trap. Secure with clamp. See Figure 44 and Figure
45.
4.
Install drain trap using appropriate PVC fittings, glue all
joints. Glue the provided drain trap as shown in Figure
44 and Figure 45. 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 39 and Figure 40 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 42 through Figure 43.
Upflow furnace (Figure 39) -
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 40) -
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 38.
