NOTE: For non-corporate furnaces, wire unit using conduit and
strain relief the wires.
CAUTION: Be sure all internal wiring connections are
tight before power is returned to the unit.
B. External Electrical Connections
1. Attach power supply conduit to hole in top of EAC. Do not
use extension cord to connect to electrical power source.
2. Cut EAC wires to 6 in. in length. Strip the ends. Using
field-supplied wire nuts, connect power leads to black and
white pigtails extending from female receptacle. (See Fig.
10.)
NOTE: Do not connect aluminum conductor to electrical connec-
tions of the EAC. Use copper wire only.
3. Connect power leads as follows:
a. Single-Speed Furnaces. EAC is wired in parallel with
fan motor. (See Fig. 11.)
b. Multispeed Direct-Drive Furnaces. If the EAC is
wired to a multispeed direct-drive motor, it must be
isolated by a relay or sail switch. Use either air cleaner
relay P/N P283-1203 or sail switch P/N 69105D1. (See
Fig. 12 or 13.)
c. Fan Coils. EAC (120v) MUST be wired to fan coil
circuit board terminals EAC 1 and EAC 2, if applicable,
ONLY as shown in Fig. 15. Terminals EAC 1 and EAC
2 will supply 240vac. Terminal EAC 1 is energized
continuously; terminal EAC 2 is energized only with the
fan motor.
4. Connect EAC ground wire (green) to appropriate supply
ground.
5. Replace cover of junction box.
C. Fan Coils with Control Boards
1. Fan coil control boards with EAC hook-up terminals MUST
be wired using EAC1 and EAC2 connections when appli-
cable. (See Figure 15.) Both EAC1 and EAC2 terminals
will supply 240vac. A 240v conversion kit MUST be used
to step down voltage to 120vac for proper electronic air
cleaner operation.
2. Fan coil control boards without EAC hook-up terminals
should be wired using a 240v conversion kit. Connect the
primary leads of transformer (240v) in parallel with fan
motor. (See Figure 16.) The secondary leads of transformer
(120v) connect to electronic air cleaner for proper opera-
tion. A field supplied accessory relay (240v) may also be
used in place of the 240v conversion kit. (See Figure 16.)
Apply 240v relay coil in parallel with fan motor. Connect
white (common) wire from EAC to N.O. contacts, then to
neutral at service panel. Check for 120v/60hz/1ph and
ensure separate ground is connected.
3. For fan coil control boards with AUX1 and AUX2 24vdc
terminals, use Kit No. KFAIR0101ACR which is offered
for use when 24v conversion kits may not be available. The
kit contains a 24vdc relay which mounts directly inside the
EAC cabinet. User supplied 110vac is activated by this
relay to power the air cleaner when G or W are present. This
preferred connection allows low-voltage wiring to be run
between the fan coil and the air cleaner and eliminates the
problems of controlling a 110vac air cleaner from the 230v
power supplied by the fan coil. (See Fig. 15.)
The ICM2 blower motor used in the FK4B Fan Coil is controlled
by low-voltage signals. The familiar 230vac air cleaner
control/power signal, EAC 1 and EAC 2, is not available. These
signals are replaced by a 24vdc signal which is provided at circuit
board terminals AUX 1 and AUX 2. This 24vdc signal is present
when either G or W is present and is active in all heating and
cooling modes.
Fig. 8—Reversing Components for Opposite Airflow
A91473
IONIZER
WIRES
PREFILTERS
PROPER
CONTACT
SPRING
LOCATION
CHARGED
COLLECTOR
PLATES
AIRFLOW AIRFLOW
Fig. 9—Line-to-Line Wiring Diagram
A89073
UNIT
POWER
SUPPLY
Y
BLU
BLU
BLU
BLU
LED
WHT
LINE
VOLTAGE
BLK
HIGH
VOLTAGE
BLK
WHT
*
TRANSFORMER
ASSY. FOR
FIELD CONN.
BLK
WHITE
POWER
SWITCH
INTERLOCK
(DO NOT
BYPASS)
WIRE CONN.
BLK
WHITE
GREEN FIELD WIRED
GROUND
FIELD WIRING
*
ON 208/240 UNITS ONLY
OPERATION LIGHT
Fig. 10—Wire Routing
A94155
TOP PLUG
WIRE COVER FOR
CHANNEL
INTERNAL
POWER WIRE
ROUTING
GROUND
FURNACE
CONTROL
BOARD
BUSHING HOLES
FURNACE
BUSHING HOLES
—6—
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