INSTALLATION CONSIDERATIONS
29
WARNING
HIGH
VOLTAGE
D
ISCONNECT
ALL
POWER BEFORE SERVICING OR
INSTALLING THIS UNIT.
M
ULTIPLE POWER SOURCES MAY
BE PRESENT.
F
AILURE TO DO SO MAY CAUSE PROPERTY
DAMAGE, PERSONAL INJURY OR DEATH.
CAUTION
L
ABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICING CONTROLS.
W
IRING ERRORS CAN COUSE IMPROPER AND DANGEROUS OPERATION.
V
ERIFY PROPER OPERATION AFTER SERVICING.
WIRING HARNESS
The wiring harness is an integral part of this furnace. Field
alteration to comply with electrical codes should not be re-
quired. Wires are color coded for identification purposes.
Refer to the wiring diagram for wire routings. If any of the
original wire as supplied with the furnace must be replaced,
it must be replaced with wiring material having a tempera-
ture rating of at least 105° C. Any replacement wiring must
be copper conductor.
115 VOLT LINE VOLTAGE CONNECTION OF
ACCESSORIES (HUMIDIFIER AND ELECTRONIC AIR
CLEANER - 96% MODELS ONLY)
The furnace integrated control module is equipped with line volt-
age accessory terminals for controlling power to an optional field-
supplied humidifier and/or electronic air cleaner.
The accessory load specifications are as follows:
Turn OFF power to the furnace before installing any accesso-
ries. Follow the humidifier or air cleaner manufacturers’ instruc-
tions for locating, mounting, grounding, and controlling these
accessories. Accessory wiring connections are to be made
through the 1/4" quick connect terminals provided on the fur-
nace integrated control module. The humidifier and electronic
air cleaner hot terminals are identified as HUM and EAC. The
humidifier and electronic air cleaner neutral terminals are identi-
fied as NEUTRAL. All field wiring must conform to applicable
codes. Connections should be made as shown. (See Figure
28.)
If it is necessary for the installer to supply additional line voltage
wiring to the inside of the furnace, the wiring must conform to all
local codes, and have a minimum temperature rating of 105°C.
All line voltage wire splices must be made inside the furnace
junction box.
The integrated control module single humidifier terminal (HUM)
is energized with 115 volts whenever the induced draft blower is
energized. This terminal can also be used to provide 115 volt
power to a humidifier transformer. The remaining primary
transformer wire would be connected to the Line N on the
control board. The integrated control module electronic air
cleaner terminals (EAC) are energized with 115 volts whenever
the circulator blower is energized.
NOTE:
Wire routing must not to interfere with circulator blower
operation, filter removal, or routine maintenance.
WARNING
T
O AVOID THE RISK OF ELECTRICAL SHOCK, INJURY, OR DEATH, THE
FURNACE MUST BE ELECTRICALLY GROUNDED IN ACCORDANCE WITH LOCAL
CODES OR, IN THEIR ABSENCE, WITH THE LATEST EDITION OF THE
N
ATIONAL
E
LECTRIC
C
ODE.
WARNING
HIGH
VOLTAGE
D
ISCONNECT
ALL
POWER BEFORE SERVICING OR
CHANGING ANY ELECTRICAL WIRING.
M
ULTIPLE POWER
SOURCES MAY BE PRESENT.
F
AILURE TO DO SO MAY CAUSE
PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
24 VOLT HUMIDIFIER
A 24 volt humidifier can be connected to the normally open
terminal of the main pressure switch. The humidifier com-
mon would then be connected to "C" on the control board
low voltage terminal strip.
If it is necessary for the installer to supply additional line
voltage wiring to the inside of the furnace, the wiring must
conform to all local codes, and have a minimum tempera-
ture rating of 105°C. All line voltage wire splices must be
made inside the furnace junction box.
24 VOLT THERMOSTAT WIRING
NOTE:
Low voltage connections can be made through ei-
ther the right or left side panel. Wire routing must not inter-
fere with circulator blower operation, filter removal, or routine
maintenance.
A 40 V.A. transformer and an integrated electronic control
are built into the furnace to allow use with most cooling equip-
ment. Consult the wiring diagram, located in the Technical
Manual or on the blower door for further details of 115 Volt
and 24 Volt wiring.
THERMOSTAT WIRING
The single stage furnace will have a "W" terminal and will
use a single stage thermostat. The following drawing illus-
trates the typical field wiring for a heat only single stage
