Service Manual

INSTALLATION CONSIDERATIONS
33
Use a separate fused branch electrical circuit containing prop-
erly sized wire, and fuse or circuit breaker. The fuse or cir-
cuit breaker must be sized in accordance with the maxi-
mum overcurrent protection specified on the unit rating plate.
An electrical disconnect must be provided at the furnace
location.
NOTE: Line polarity must be observed when making field
connections.
W
A
R
N
I
N
G
IN 90% FURNACE UPRIGHT UPFLOW INSTALLATIONS, THE DRAIN TRAP MUST
BE MOUNTED ON THE OPPOSITE SIDE OF THE UNIT FROM THE JUNCTION
BOX.
THIS WILL REDUCE THE RISK OF WATER REACHING THE JUNCTION
BOX IN THE EVENT OF A BLOCKED DRAIN CONDITION.
Connect hot, neutral, and ground wires as shown in the wir-
ing diagram located on the unit’s blower door. Line polarity
must be observed when making field connections. Line volt-
age connections can be made through either the right or left
side panel.
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
N
ATIONAL
E
LECTRIC
C
ODE.
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.
All communicating furnaces have an integrated igni-
tion control that is equipped with line voltage acces-
sory terminals for controlling power to an optional field-
supplied humidifier and/or electronic air cleaner.
Humidifier 1.0 Amp maximum at 120 VAC
Electronic Air Cleaner 1.0 Amp maximum at 120 VAC
Accessory Load Specifications
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 CONNECTION OPTIONS
24 volt thermostat
Option 1: Use the single HUM terminal to supply 115 VAC
to a humidifier transformer. This terminal is pow-
ered anytime there is a call for heat.
Option 2: Use the brown wire coming off the common side
of the pressure switch to supply 24 VAC to hu-
midifier
Option 3: The HUM IN / HUM OUT terminals are dry con-
tacts that will close during a call for heat. To
power a humidifier with these contacts The HUM
IN contact can be fed with 24vac from the R ter-
minal or line voltage from the L1 terminal.
Communicating Thermostat
CTK01: The CTK01 is not capable of supplying a call for
humidity; therefore if a humidifier is used it must be con-
trolled by a separate humidistat. The recommended wiring
is one of the methods shown with a 24 volt thermostat.
CTK02 is capable of generating a call for humidity. See dia-
gram for wiring. The user is now provided with 3 modes of
operations which can be selected within the thermostat user
menu.
1. ON: Humidifier is turned on with a heat demand.
2. OFF: Humidifier remains off (relay never closes).
3. IND: Humidifier will cycle with humidification demand, in-
dependent of heat demand. This mode allows the user
to select one of 4 fan speeds (25, 50, 75, and 100%).
CTK03AA, does notprovide a call for humidity when used
with the 2 stage communicating furnaces. The single HUM
terminal on the PCBKF103, PCBKF104, or PCBKF105
control board will provide a line voltage output when the
inducer is running.
CTK03AB and CTK04, can provide a humidity call to the
PCBKF103, PCBKF104, or PCBKF105 control board relay
and operate the HUM IN - HUM OUT dry contacts.
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 shown in OPTIONAL ACCES-
SORIES, Accessories Wiring figure.