30 18-CD26D1-10
Installer’s Guide
the secondary recuperative cell. Remove the larger drain line
(from the secondary cell) and trim to fit between the second-
ary cell and the new trap location. On upflow units, plug the
hole in the blower deck where the tube went through.
Remove the hose from the induced blower and reposition into
the other drain tap of the inducer, which is located 90°
clockwise around the inducer. Move the cap from that drain
tap to the unused drain tap. On upflow units, plug the hole in
the blower deck where the tube went through. This tube on
downflow units will need to be cut to fit between the inducer
and the trap. On upflow units, this tube may need to be
extended, using the tubing shipped with the furnace.
Connections must be made to an OPEN/VENTED DRAIN.
Outdoor draining of the furnace and coil condensate is
permissible if allowed by local codes. Caution should be taken
to prevent drains from freezing or causing slippery conditions
that could lead to personal injury. Excessive draining of
condensate may cause saturated ground conditions that may
result in damage to plants.
NOTE: Use 1/2" or larger PVC or CPVC pipe and fittings as
required for drain connections (fittings, pipe and solvent
cement not provided).
NOTE: A corrosion resistant condensate pump must be
used if a pump is required for a specific drain system.
IMPORTANT: The condensate drain should be installed with
provisions to prevent winter freeze-up of the condensate drain
line. Frozen condensate will block drains, resulting in furnace
shutdown. If the drain line cannot be installed in a conditioned
space, then UL listed heat tape should be applied as required
to prevent freezing (per manufacturer’s instructions). The heat
tape should be rated at 5 or 6 watts per foot at 120 volts. Self-
regulating (preferred) or thermostatically controlled heat tape is
required.
Figure 51. DOWNFLOW (VERTICAL)
Left
side
Use CPVC tubing from Trap outlet,
over burner box to cabinet exit
Figure 52. DOWNFLOW (VERTICAL)
Right
side
Cut off curved end of
Inducer drain hose
Figure 53. DOWNFLOW (HORIZONTAL)
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