32 18-CD30D1-12
Installer’s Guide
VERTICAL APPLICATIONS
Upflow Vertical Furnace - The connection tubing for left
and right side drainage is shipped in the blower compart-
ment. Install the connection tubing from the trap to the
side of the unit and trim all excess tubing to avoid kinks.
See Figures 43 & 44.
CONDENSATE DRAIN INSTRUCTIONS
It is recommended that an external overflow drain pan
be installed under the furnace to prevent property
damage or personal injury from leaking condensate.
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 second-
ary 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 auxiliary drain pan in order to prevent water dam-
age to the finished ceiling below. See Figure 42.
Primary drain vent stack
must terminate below
secondary heat exchanger
condensate drain outlet.
To drain opening
If upflow furnace is installed
over a finished ceiling, overflow
from the primary drain vent
stack must flow into an auxillary
drain pan to prevent damage to
the finished ceiling below.
@
Right side
UPFLOW (VERTICAL)
#
Condensate
Trap
Condensate
Trap
UPFLOW (VERTICAL)
Left side
$
NOTE:
The condensate trap must be primed before operation.
Condensate trap
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