28 18-CD26D1-10
Installer’s Guide
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 and/ or its surrounding ambient tempera-
ture is expected to fall below freezing, then 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 (pre-
ferred) or thermostatically controlled heat tape is required.
Typical sources of UL listed heat tapes are W.W. Granger, Inc.
(Wintergard Plus
TM
Series), McMaster Carr Supply Co.
(3554 Series), or your equipment supplier.
The condensate drain may be cleaned or inspected by re-
moval of the drain tube at the header.
Evaporator and Furnace condensate drain piping may be
manifolded together as shown in Figure 46. A primary drain
vent stack must be installed and terminated below the
outlet of the secondary 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.
ALL HORIZONTAL APPLICATIONS
ARE LEFT SIDE DRAIN ONLY
TO
OPEN/
VENTED
DRAIN
UPFLOW FURNACE ON LEFT SIDE
WITH LEFT DRAIN SHOWN
HEADER
Figure 45
Primary drain vent stack
must terminate below
secondary heat exchanger
condensate drain outlet.
To drain opening
f upflow furnace is installed
ver a finished ceiling, overflow
rom the primary drain vent
tack must flow into an auxillary
rain pan to prevent damage to
he finished ceiling below.
Figure 46
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