508093-01
Issue 2033
Page 41 of 59
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 45 for condensate trap
locations. Figure 51 (3/4” drain connection) and Figure
52 (1/2” drain connection) 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.
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 Figure
4.
Install drain trap using appropriate PVC fittings, glue
all joints. Glue the provided drain trap as shown in
Figure 51 or Figure 52. 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 46 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 46 and Figure 49) - 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 47 and 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
on the trap using a hose clamp. See Figure 44.
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.
Figure 43.
Tubing
Hose Clamp
Barbed Fitting
Elbow
Figure 44.
Field-Provided Drain Components
Do not use copper tubing or existing copper condensate
lines for drain line.
CAUTION
