9
Unit Operation
Unit Power On:
Plug in the unit to the power source. e LED display will show
the current controller version number for 0.5 seconds. en,
the LED temperature indicator will illuminate the set point for
5 seconds and then switch to the room temperature reading.
e Power RED LED will illuminate. By depressing any mode
button, the Power LED will turn o.
Fan High:
Depress the FAN HI button, the unit will be in fan mode and the
evaporator fan blower will operate at High Speed. e GREEN
LED will illuminate accordingly.
Fan Low:
Depress the FAN LO button, the unit will be in fan mode and
the evaporator fan blower will operate at Low Speed. e
GREEN LED will illuminate accordingly.
Cooling High:
Depress the COOL HI button, the unit will be in cooling mode
depending on thermostat reading. e compressor will turn on
based on the thermostat reading and the Compressor O Time
setting. e evaporator fan blower will operate at High Speed.
e BLUE LED will illuminate accordingly.
Cooling Low:
Depress the COOL LO button, the unit will be in cooling mode
depending on thermostat reading. e compressor will turn on
based on the thermostat reading and the Compressor O Time
setting. e evaporator fan blower will operate at Low Speed.
e BLUE LED will illuminate accordingly.
Heating High (Heat Pump Unit):
Depress the HEAT HI button; the unit will be in the heating
mode depending on the thermostat reading. e reversing valve
will operate to prompt the heat pump mode. e compressor
will turn on based on the thermostat reading and the Compres-
sor O Time setting. e evaporator fan blower will operate at
High Speed. e AMBER LED will illuminate accordingly.
Heating Low (Heat Pump Unit):
Depress the HEAT LO button; the unit will be in the heating
mode depending on the thermostat reading. e reversing valve
will operate to prompt the heat pump mode. e compressor will
turn on based on the thermostat reading and the Compressor
O Time setting. e evaporator fan blower will operate at Low
Speed. e AMBER LED will illuminate accordingly.
Temperature Setting:
During any mode of operation, the user is able to change the set
point by depressing the arrow buttons. e
temperature indicator will switch to display “set point
temperature”. Depressing the ARROW UP or ARROW DOWN
button will change the set point. e SETPOINT LED will illu-
minate. e temperature indicator will switch back to display
“room temperature” aer 5 seconds.
Change from °F to °C:
Hold the COOL HIGH button for 5 seconds and the display will
switch from Farenheit to Celsius or vice versa.
Unit O:
Depress the OFF button at any time to turn the SYSTEM MODE
o. e unit will remain idle until further
instruction. e Power RED LED will illuminate.
Other Settings:
During the cooling mode, the compressor will only be energized
if the temperature is at least 2° above the set point, and de-en-
ergized once the temperature falls to 2° below the set point.
During the heating mode, the compressor will only be energized
if the temperature is at least 2° below the set point, and de-en-
ergized once the temperature rises 2° above the set point. User
is able to manually change the temperature dierential (default
set at 2) by depressing both UP and DOWN arrow key and then
adjust UP and DOWN arrow to set the dierential from 1-4°.
Aer 3 seconds, it will return to the room temperature reading.
Compressor O Time:
e compressor routine guarantees a 5-minute minimum o
time on the compressor, and it will not energize until the 5-min-
ute o time has been satised.
Self Recovery Mode (*):
e unit controller is shipped with self-recovery mode activated
so that with any sudden power interruption, the set point and
operating mode are stored in memory and the unit will retain
these settings and resume operation once power is restored.
When the self-recovery mode is enabled the decimal point on
the second character on the LED display is always On. If self-re-
covery mode is not enabled then the second decimal point is
always O. However, the user is able to enable the “Self Recov-
ery Mode” by depressing the OFF button for 5 seconds and then
adjust the setting from the arrow key.
A0 – Self Recovery Mode “o”
A1 – Self Recovery Mode “on” (Factory Default Setting)
Check Alarms:
e controller will monitor and check the status of three alarm
signals:
1. Alarm_High_Pump (H.P),
2. Alarm_Freeze (E.F),
3. Alarm_Temperature_Sensor (E.S).
When E.F, or E.S alarm is present, the Power LED will blink,
signaling that the alarm condition is present, and the unit will
lock out. Once the failure is cleared, press the OFF button, the
Power LED will stop blinking, and the room temperature will
display.
