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Cassette Air Handler
32
SEQUENCE OF OPERATION
NOTE: Once the cooling has cycled off or fol-
lowing a power outage, the compressor will not re-
start for at least three (3) minutes (See Anti-Short
Cycle Timer).
REVERSING VALVE:
EMI outdoor heat pump units utilize a re-
versing valve that is energized in Cooling
Mode. Make sure that the thermostat se-
lected will energize the reversing valve in
Cooling Mode.
ELECTRIC HEAT OPERATION:
The remote thermostat will control the
call for electric heat operation (on or off)
through the low Volt terminals “R” and “W”.
After connecting the thermostat to the unit,
place the system switch in Heating Mode.
Adjust the setpoint temperature above the
room temperature. The electric heat will
energize along with the indoor fan motor.
Heating will continue so long as the set-
point remains above room temperature.
Place the set-point temperature below
room temperature. The electric heater will
switch off and the indoor fan will remain on
for an additional sixty (60) seconds.
NOTE: Once the heating has cycled off or fol-
lowing a power outage, heating will not re-start
for at least three (3) minutes. (See Anti-Short
Cycle Timer)
OPTIONAL HEAT PUMP WITH ELEC-
The remote thermostat will control the
call for electric heat operation (on or off)
through the low Volt terminals “R” and “W”
and for compressor (heat pump) heating
through terminals “R” and “Y”. After con-
necting the two (2) stage heating thermo-
stat to the unit, place the system switch in
Heating Mode. Adjust the setpoint temper-
ature above the room temperature. The
compressor and fan motors will start and
heating will begin. Depending on the ther-
mostat selected, electric heat will also en-
ergize when the deviation between room
temperature and setpoint temperature is
high enough to call for second stage heat-
ing. (See the thermostat owner’s manual
for this feature) Place the setpoint tem-
perature below the room temperature. The
outdoor Heat Pump unit and electric heat
will stop while the indoor fan will remain on
for an additional sixty (60) seconds.
CLEAN FILTER ALARM (REMOTE
To aid in lter maintenance, the Cassette
controller will indicate when a scheduled
lter cleaning is required by ashing the
Timer/Alarm LED. During normal opera-
tion, the microprocessor will keep track of
the unit’s run time. When the clean lter
time has elapsed, the Timer/Alarm LED
will ash four (4) times to indicate that the
lter needs to be cleaned. For Remote
Thermostat Operation, the default clean
lter time is 1000 hours. Also, if an evapo-
rator freeze condition is detected four (4)
times within a 24 hour period, the Clean
Filter Alarm will appear on the Cassette
User Interface.
After lter maintenance has been per-
formed, press the Clear Filter Warning
Button for three (3) seconds. The control
will respond with a beep to indicate that
the timer has been reset.
OTHER FEATURES
The Cassette control incorporates an
Anti-Short Cycle Timer (ASCT) feature
designed to protect the unit from short cy-
cling. The ASCT is activated immediately
following the off cycle of Cooling or Heat-
ing Mode. Once the room temperature
is satised and the unit switches off, the
ASCT will not allow heating or cooling to
restart unit a three (3) minute time period
has elapsed.
This feature will prevent the compres-
sor and heat source from rapid re-starts.
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