507714-01
Page 29 of 52
Issue 1716
Condensate Piping
This unit is designed for either right or left side exit of
condensate piping in downflow applications. Refer to
Figure 47 for condensate trap locations.
NOTE:
If necessary the condensate trap may be installed
up to 5 feet away using PVC pipe from the furnace. 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. Use a large flat head screw driver or a 1/2” drive
socket extension and remove plug (Figure 47) 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.
3. Install the cap over the clean out opening at the base
of the trap. Secure with clamp. See Figure 51.
4. Install drain trap using appropriate PVC fittings, glue
all joints. Glue the provided drain trap as shown in
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.
NOTE:
Vinyl tubing may be used for condensate
drain. Tubing must be 1-1/4” ODx1”ID and should be
attached to the drain on the trap using a hose clamp.
Figure 47. Condensate Trap and Plug Locations
5. Figure 49 shows 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 50. The field provided vent must
be a minimum 1” to a maximum 2” length above the
condensate drain outlet connection.
6. If unit will be started immediately upon completion of
installation, prime trap per procedure outlined in Unit
Start-Up section.
Condensate line must slope downward away from the
trap to drain. If drain level is above condensate trap,
condensate pump must be used. Condensate drain line
should be routed within the conditioned space to avoid
freezing of condensate and blockage of drain line. If
this is not possible, a heat cable kit may be used on the
condensate trap and line. Heating cable kit is available in
various lengths; 6 ft. (1.8 m) - kit no. 26K68; 24 ft. (7.3 m) -
kit no. 26K69; and 50 ft. (15.2 m) - kit no. 26K70.
Figure 48. Condensate Trap Location
(shown with right side exit of condensation)
Do Not use copper tubing or existing copper condensate
lines for drain line.
CAUTION
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.
CAUTION
