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F50E DUCT MOUNTED ELECTRONIC AIR CLEANER
68-0072—5
13
Complete Wiring
CAUTION
Electric Shock Hazard.
Can cause personal injury.
• The line voltage power source must match the
voltage and frequency printed on the label inside
the access door.
• Opening the access door disconnects high voltage
power and discharges the cell. Always turn off the
air cleaner and open the access door before
touching any internal components.
• The air cleaner must be permanently connected to
the power source and properly grounded. Do not
use an extension cord.
❑ Disconnect power source before beginning wiring to avoid
electrical shock or equipment damage. All wiring must
comply with local codes and ordinances.
IMPORTANT
In a multispeed blower application, isolate the air
cleaner with a dpdt fan relay or sail switch. The air
cleaner overheats and burns out if it is connected in
parallel with one winding of a multispeed fan motor,
and a different winding is powered during a
thermostat call for cooling.
❑ Wire the air cleaner to run only when the system
blower is running.
1. If the system blower is driven by a single-speed, single-
phase motor, wire the air cleaner into the fan circuit.
See Fig. 24.
2. If the system blower is driven by a 3-phase, variable
speed or a 2-speed motor, the air cleaner
must
be
isolated from the blower motor. Use a sail switch
mounted in the return air duct (see Fig. 25), a dpdt fan
relay (see Fig. 26), or furnace manufacturer supplied
terminals. Connecting the air cleaner in parallel with
one speed of a multispeed motor can create an
auto-
transformer effect
. If connected with the high speed,
voltage supplied to the air cleaner at low speed is too
low, and the air cleaner may not operate at all. If con-
nected with the low speed, voltage to the air cleaner at
high speed is too high and the air cleaner will burn out.
Connect Ductwork
❑ Connect the vertical duct section to the elbow. If the
vertical drop of the duct is less than 7 in. (178 mm) from
the side of the furnace, shorten the horizontal trunk or
attach an offset fitting to the elbow.
❑ When ductwork is properly aligned, connect vertical duct
to horizontal trunk. See Fig. 25.
Seal Joints
❑ Seal all joints in the return air system between the air
cleaner and the furnace to prevent dust from entering the
clean airstream.
Disable Unused Prefilter Guide
❑ Crimp the end of the downstream (closest to furnace)
prefilter guide to prevent incorrect prefilter installation
following cleaning. See Fig. 26.
M4684
L1
(HOT)
L2
1
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
HEAT
COOL
HUMIDISTAT
TRANSFORMER
HUMIDIFIER
F50
ELECTRONIC
AIR CLEANER
WITHOUT
SOILD STATE
AIR FLOW
SWITCH
JUMPER
R8222D
FAN
CONTROL
SYSTEM
TRANSFORMER
BLOWER
MOTOR
BROWN
BLACK
HI
LO
C
1
4
2
3
5
6
G
W
R
Y
Fig. 24. Two-speed blower motor. F50 without solid state
air flow switch is controlled through a dpdt fan relay.
Note power humidifier connections.
Fig. 25. Complete the duct installation.