26 18-CD35D1-1
INSTALLER’S GUIDE
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.
SEE
NOTE 6
From drawing B341437 Rv 1
FURNACE
TWIN
SEE
NOTE 7
B/C
B/C
TO 115 V 1 PH.,
60 HZ., POWER
SUPPLY PER
LOCAL CODES
HUM SEE
NOTE 5
EAC SEE
NOTE 5
FIELD WIRING DIAGRAM FOR 1 STAGE FURNACE
1 STAGE HEATING
USING A 1 STAGE HEATING THERMOSTAT
NO COOLING
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.
Q
Evaporator and furnace condensate drain piping may be
manifolded together as shown in Figure 51. 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 damage to the finished ceiling below.
TWINNING FURNACES
These furnaces may be twinned. Twinning requires that two
furnaces with the same configuration, capacity, and airflow must
be used. They shall have common returns with equal pressure
drops or ducts with equivalent lengths and sizes. See Field
Wiring Diagrams for proper hookup.
