26
18-CD33D1-4
Installer’s Guide
pan to a separate drain line (no trap is needed in this line).
The trap must be repositioned to the exterior of the cabi-
net. Remove the trap from its present location and reposi-
tion the trap outside of the unit, through the long circular
hole, next to the secondary recuperative cell. Remove the
larger drain line (from the secondary cell) and trim to fit
between the secondary 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 be-
tween 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 con-
densate is permissible if allowed by local codes. Caution
should be taken to prevent drains from freezing or caus-
ing 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 re-
quired 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. Fro-
zen condensate will block drains, resulting in fur nace shut-
down. If the drain line cannot be installed in a conditioned
space, then UL listed heat tape should be applied as re-
quired 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.
Evaporator and furnace condensate drain piping may
be manifolded together. A primary drain vent stack must
be installed and terminated below the outlet of the sec-
ondary heat exchanger drain connection to prevent water
from damaging furnace controls if the primary drain outlet
plugs up. Where the furnace is installed above a finished
ceiling, the primary drain vent stack must be installed
such that overflow from the vent stack opening will flow
into an axillary drain pan in order to prevent water dam-
age to the finished ceiling below.
DOWNFLOW (VERTICAL)
Left
side
Use CPVC tubing from Trap outlet,
over burner box to cabinet exit
DOWNFLOW
(VERTICAL)
Right
side
Cut off curved end of
Inducer drain hose
DOWNFLOW (HORIZONTAL)
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