EMI S1CA9000 - AUTO Changeover MODE

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Cassette Air Handler
SEQUENCE OF OPERATION
If the room temperature is greater than the
setpoint temperature by more than two
(2) degrees the unit will run Cooling Mode
constantly. If the room temperature is with-
in ± two (2) degrees of setpoint, the unit
will cycle cooling on seven (7) minutes and
off seven (7) minutes to remove humid-
ity from the air while not over cooling the
room. If the room temperature is less than
the setpoint temperature by more than two
(2) degrees, cooling will remain off.
AUTO CHANGEOVER MODE:
For Auto Changeover Mode (ACO) the unit
must have a heat source. Also the control
must rst be congured properly (Heat
source – ON). See: Conguration Mode.
In Auto Changeover Mode, the Cassette will
operate in either Cooling Mode or Heating
Mode. The control will select the mode of
operation depending on the setpoint tem-
perature, room temperature and the differ-
ential setting selected in the Conguration
Mode. (See Conguration Mode)
For Auto Changeover Mode, rst turn the
unit ON via the POWER/SEND button. Se-
lect Auto Mode via the MODE button. The
room temperature and setpoint tempera-
ture will be displayed. Press either the UP
or DOWN ARROW buttons to change the
setpoint temperature. The setpoint tem-
perature will change by one (1) degree with
each successive press of the UP or DOWN
ARROW buttons. Holding the button down
will change the temperature rapidly.
Place the setpoint temperature below the
room temperature by the auto change
over differential amount selected in the
Conguration Mode. The compressor will
start and the unit will run cooling operation
as described under Cooling Mode.
If the setpoint temperature is above the
room temperature by the auto change over
differential amount selected in the Congu-
ration Mode, the unit will run heating opera-
tion as described under Heat Mode.
SET TIME MODE:
The clock is used by the 7-Day Program-
ming Mode. The CLOCK button is
used to enter or exit the Set Time Mode.
The Set Time Mode can be entered while
the control is in any mode, including the
Off Mode. To enter the Set Time Mode,
press the
CLOCK button for three (3)
seconds. Pressing the PROGRAM
button will advance to the next item. The
order is (1) Day of week, (2) Hour and (3)
Minute. The time of day and day of week
can be changed using the UP or DOWN
ARROW buttons.
When the
CLOCK button is pressed
again or left idle for twenty (20) seconds,
the control will save the new settings and
return to the previous mode.
NOTE: The unit will not adjust for Day Light
Savings time.
7-DAY PROGRAMMING MODE:
The 7-day Programming Mode is used
to store the settings for the Pre-Program
Run Mode. When the unit is in either the
Off or On Mode, the 7-Day Program-
ming Mode can be entered by pressing
the PROGRAM
+ CLOCK but-
tons simultaneously for three (3) seconds.
When the PROGRAM
+ CLOCK
buttons are pressed simultaneously again
or left idle for twenty (20) seconds, the
control will save the new settings and re-
turn to the previous interface mode.
While in the 7-Day Programming Mode,
the words “7-DAY PROGRAM” are displayed
on the LCD. Use the UP or DOWN ARROW
buttons to change the time, temperature or
period settings. Use the
CLOCK or
PROGRAM
buttons to select the mode
to be changed.
Settings for; a) Day of week, b) Period of
day, c) Hour, d) Minute, e) Cooling setpoint
temperature, f) Heating setpoint tempera-
ture, and g) Auto setpoint temperature can
be entered.