7
CONSTANT TORQUE (EEM) MOTORS
ACNF25 and ACNF31 models utilize constant torque (EEM) mo-
tors. These motors come with a separate control box which is
mounted on the side of the unit as shown in Figure 8. The har-
ness from the motor is inserted into the control box which has
another harness leading into the control panel of the unit.
Control Box
Figure 8
The high voltage wiring is the same as the other ACNF models.
The low voltage wiring connections for the ACNF25 and ACNF31
models are shown in Figure 9. The wire from the motor, T2 (purple,)
T3 (pink) or T4 (yellow), connects to “Y” from the thermostat/con-
denser depending on the application. The rest of the connections
are similar to the other ACNF models.
R
G
W
C
Thermostat
Air Handler
Condensing Unit
#18 Gauge
24 VAC
#18 Gauge
24 VAC
Y
R
G
W
C
Y
Y
Note: Connect T2,T3 or T4 to the Y
terminal to the outdoor unit.
T1
T5
CONFIRM SPEED TAP SELECTED (T2, T3, OR T4)
IS APPROPRIATE FOR THE APPLICATION BASED ON THIS TABLE.
WIRE COLOR
PURPLE
PINK
YELLOW
BTU
18000
24000
h
HIGH CFM OPTION
Figure 9
MAINTENANCE
Room Thermostat
The room thermostat controls the operation of your heating and/
or cooling unit. It senses the indoor temperature and signals the
equipment to start or stop maintaining the temperature you have
selected for your comfort. The room thermostat should be in a
central, draft free inside wall location for best operation. Do not
place any heat producing apparatus such as lights, radio, etc.,
near the thermostat as this will cause erratic operation of the
comfort system.
Air Filter(s)
All central air moving comfort systems must include air filter(s).
Locate these filters in either the equipment or return air duct sys-
tem upstream of the equipment. The filter(s) removes dust and
debris from the air thus helping to keep your conditioned space
clean. More important, the filter keeps dust and debris from col-
lecting on heat transfer surfaces thus maintaining optimum equip-
ment efficiency and performance. Inspect and clean or replace
filters every month. This routine maintenance procedure will pay
big dividends in reduced operating cost and reduced service ex-
pense. Never operate comfort equipment without filter(s).
Fuses and/or Circuit breakers
This comfort equipment should be connected to the building elec-
tric service in accordance with local and National Electric codes.
This electrical connection will include over current protection in
the form of fuses or circuit breakers. Have your contractor iden-
tify the circuits and the location of over current protection so that
you may be in a position to make inspections or replacements in
the event the equipment fails to operate. Keep replacement fuses
of the proper size on hand.
Periodic Checkup and Service
This unit is designed to provide many years of dependable, trouble-
free comfort when properly maintained. Proper maintenance will
consist of annual checkups and cleaning of the internal electrical
and heat transfer components by a qualified service technician.
Failure to provide periodic checkup and cleaning can result in
excessive operating cost and/or equipment malfunction.
Aluminum Indoor Coil Cleaning (Qualified Servicer Only)
This unit is equipped with an aluminum tube evaporator coil.
The safest way to clean the evaporator coil is to simply flush the
coil with water. This cleaning practice remains as the recom-
mended cleaning method for both copper tube and aluminum
tube residential evaporator coils.
It has been determined that many coil cleaners and drain pan
tablets contain corrosive chemicals that can be harmful to alu-
minum tube and fin evaporator coils. Even a one-time applica-
tion of these corrosive chemicals can cause premature alumi-
num evaporator coil failure. Any cleaners that contain corrosive
chemicals including, but not limited to, chlorine and hydroxides,
should not be used.
An alternate cleaning method is to use one of the products listed
in TP-109* to clean the coils. The cleaners listed are the only
agents deemed safe and approved for use to clean round tube
aluminum coils. TP-109 is also available on the web site in Part-
ner Link > Service Toolkit.
NOTE: Ensure coils are rinsed well after use of any chemical clean-
ers.
