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This furnace is equipped with a blower door interlock switch
which interrupts unit voltage when the blower door is opened for
servicing. Do not defeat this switch.
24 V
T
W
OLT
HERMOSTAT
IRING
NOTE: Wire routing must not interfere with circulator blower
operation, filter removal, or routine maintenance.
Low voltage connections can be made through either the right or
left side panel. Thermostat wiring entrance holes are located in
the blower compartment.
connections for a "heat only" system and "heat/cool system".
Heating
Room Thermostat
W
R
Y
R
C
G
W
Furnace
Control
Typical Field Wiring (24 VAC Control Circuit)
This furnace is equipped with a 40 VA transformer to facilitate
use with most cooling equipment. Consult the wiring diagram,
located on the blower compartment door, for further details of
115 Volt and 24 Volt wiring.
A single-stage thermostat with only one heating stage can be
used to control this furnace.
S
H
A
ETTING THE
EAT
NTICIPATOR
The following method should be used in measuring the amp
draw of the control circuit to assure proper adjustment of the
thermostat heat anticipator
R
R
• Wrap the "R" leg around a clip-on ammeter 10 times.
• Energize the furnace in the heat mode.
• Record the reading.
• Divide this reading by 10.
• Set the heat anticipator on the thermostat to match this
reading.
Example: If the reading on the ammeter is "4", divide this by 10.
The anticipator setting will be .4 amps.
The following figure shows
Heating/Cooling
Room Thermostat
Y
W
G
R
Y
Y
C
R
C
C
G
Remote
W
Condensing
Unit
Furnace
Control
115 V
L
C
OLT
INE
ONNECTION OF
(E
A
C
LECTRONIC
IR
LEANER
T
O AVOID PERSONAL INJURY, ELECTRICAL SHOCK OR DEATH, DISCONNECT
ELECTRICAL POWER BEFORE SERVICING OR CHANGING ANY ELECTRICAL
WIRING.
The furnace integrated control module is equipped with line
voltage accessory terminals for controlling power to an optional
field-supplied electronic air cleaner.
The accessory load specifications are as follows:
Electronic Air Cleaner
Turn OFF power to the furnace before installing any accessories.
Follow the air cleaner manufacturers' instructions 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 furnace integrated control
module. The electronic air cleaner hot terminal is identified as
EAC-H and the neutral terminal is identified as NEUTRAL. All
field wiring must conform to applicable codes. Connections
should be made as shown in the following illustration.
Hot 120 VAC
Optional
Accessories
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 electronic air cleaner terminals
(EAC) are energized with 115 volts whenever the circulator blower
is energized.
24 V
H
AC
UM
The yellow wire connected to the I.D. Blower pressure switch
is powered anytime the pressure switch is closed and provides
24 VAC humidifier control. Remove the yellow wire and connect
the supplied brown jumper wire to the pressure switch
terminal. Reconnect the yellow wire to the "piggyback" terminal
on the brown jumper and then connect the 24 VAC line of the
humidifier to the stripped end of the brown wire. Using a wire
nut or a field-supplied quick connect terminal can make this
connection. The wiring must conform to all local and national
codes. Connect the COM side of the humidifier to the B/C
terminal on the furnace control board (or to the COM side of
the 24 VAC transformer). DO NOT CONNECT 115V HUMIDIFIER
TO THESE TERMINALS.
16
A
CCESSORIES
)
WARNING
1.0 Amp maximum at 120 VAC
Control Module
Neutral 120 VAC
Air Cleaner
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