Service Manual

PRODUCT DESIGN
31
CAUTION
E
DGES OF SHEET METAL HOLES MAY BE SHARP.
U
SE GLOVES A PRECAUTION
WHEN REMOVING HOLE PLUGS.
NOTE: Wire routing must not interfere with circulator blower
operation, filter removal, or routine maintenance.
WARNING
TO 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
NATIONAL ELECTRIC CODE.
115 VOLT LINE CONNECTION OF ACCESSORIES
(HUMIDIFIER AND ELECTRONIC AIR CLEANER)
WARNING
HIGH VOLTAGE
D
ISCONNECT
ALL
POWER BEFORE SERVICING OR
CHANGING ANY ELECTRICAL WIRING.
MULTIPLE POWER
SOURCES MAY BE PRESENT.
FAILURE TO DO SO MAY CAUSE
PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
Furnaces have an integrated ignition control that is equipped
with line voltage accessory terminals for controlling power
to an optional field-supplied humidifier and/or electronic air
cleaner.
Accessory Load Specifications
Humidifier 1.0 Amp maximum at 120 VAC
Electronic Air Cleane
r
1.0 Amp maximum at 120 VAC
Turn OFF power to the furnace before installing any acces-
sories. Follow the humidifier or air cleaner manufacturers’
instructions for locating, mounting, grounding, and control-
ling these accessories.
HUMIDIFIER WIRING
Accessory wiring connections are to be made through the
1/4" quick connect terminals provided on the furnace inte-
grated control module. The Humidifier and Electronic Air
Cleaner hot and neutral terminals are identified as HUM and
EAC. All field wiring must conform to applicable codes. Con-
nections should be made as in the following figure.
ELECTRONIC
AIR CLEANER
HUMIDIFIER
OPTIONAL
ACCESORIES
12 PIN
CONNECTOR
120 VAC
NEUTRAL
TERMINALS
N
E
U
T
R
A
L
HUM-H
EAC-H
120 VAC
HOT AND
PARK
TERMINALS
INTEGRATED
CONTROL
MODULE
Wiring to Single HUM Terminal
NEUTRAL
HUM-OUT
HUM-IN
Wiring Using HUM IN - HUM OUT Terminals
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.
Humidifier Wiring
There are several options for connecting humidifier wiring to
the current communicating furnace control board
(PCBKF103, PCBKF104, PCBKF105)
Single HUM terminal The single HUM terminal is energized
with 115 volts whenever the draft inducer is running. This
function is present regardless of thermostat type. This ter-
minal may be used to power a humidifier transformer. A field
supplied humidistat must be provided with this option.
HUM IN – HUM OUT Terminals Present on communicating
furnace models built with a PCBKF103, PCBKF104, or
PCBKF105 control board. These terminals may be used
when a CTK02** or CTK03AB communicating thermostat is
used. These thermostats are capable of initiating a call for
humidity.The HUM IN – HUM OUT terminals are not ener-
gized by factory wiring and must be field wired.Typical wir-
ing would be to supply the HUM IN contact with 115 volts
from the furnace L1 terminal and connect a line voltage hu-
midifier / transformer between HUM OUT and the control
board neutral.