507581-04
Page 34 of 59
Issue 1933
4. Install drain trap using appropriate PVC fittings, glue
all joints. Glue the provided drain trap as shown in
Figure 59. Route the condensate line to an open drain.
Condensate line must maintain a 1/4” downward slope
from the furnace to the drain.
Do not use copper tubing or existing copper condensate
lines for drain line.
CAUTION
5. Figure 54 and Figure 55 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 57 and Figure 58.
Upflow furnace (Figure 53) -
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 55) -
In horizontal furnace
applications the field provided vent must be 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
:
Vinyl tubing may be used for condensate drain.
Tubing must be 1-1/4” o.d. X 1” i.d. and should be
attached to the drain on the trap using a hose clamp.
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 53. Condensate Trap Locations
(Unit shown in upflow position with remote trap)
*Piping from furnace must slope down a minimum of 1/4” per ft.
toward trap.
Figure 54. Unit with Evaporator Coil
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
