508134-01
Issue 2045
Page 39 of 56
Condensate Piping
This unit is designed for either right- or left-side exit of
condensate piping. Refer to Figure 41 for 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 41) 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.
3.
Install the cap over the clean out opening at the base
of the trap. Secure with clamp. See Figure 47 or Figure
4.
Install drain trap using appropriate PVC fittings, glue
all joints. Glue the provided drain trap as shown in
Figure 47 or Figure 48. 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 45 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 46. The field provided vent must
be a minimum 1” to a maximum 2” length above the
condensate drain outlet connection.
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 42.
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 from Allied in various lengths; 6 ft. (1.8m) - kit
no. 26K68 and 24 ft. (7.3m) - kit no. 26K69.
Figure 41. Condensate Trap and Plug Locations
Trap
(same on
right side)
Plug
(same on left
side)
1-1/2 in.
Tubing
Hose Clamp
Barbed Fitting
Elbow
Figure 42.
Field-Provided Drain Components
Do not use copper tubing or existing copper condensate
lines for drain line.
CAUTION
