Classic 20 ACU Installation, Operating & Maintenance Manual
AC-2 CS020020 USACG-6 Manual Rev B Page 9 of 16
5.3 Modify cooling set point
1. Press L button for 2 seconds and release (Display will begin “Display Mode”)
2. Press L&R button simultaneously for 2 seconds and release (Display will show “test”)
3. Press R button for 2 seconds and release (Display will show “H SP”)
4. Press R button for 2 seconds and release (Display will show “C SP”)
5. Press L button for 2 seconds and release (Display will show current Cooling Set Point)
a. Press and hold R button to raise setting (Maximum is 104
o
F/40°C)
b. Press and hold L button to lower setting (Minimum is 68
o
F/20°C)
6. Do nothing for 10 seconds to accept new setting OR Press L&R button simultaneously for 2 seconds
to accept new setting (Display will show main menu again)
5.4 Change unit of measure
1. Press L button for 2 seconds and release (Display will begin “Display Mode”)
2. Press L&R button simultaneously for 2 seconds and release (Display will show “test”)
3. Press R button for 2 seconds and release (Display will show “H SP”)
4. Press R button for 2 seconds and release (Display will show “C SP”)
5. Press R button for 2 seconds and release (Display will show “unit”)
6. Press L button for 2 seconds and release (Display will show current Unit of measure)
a. Press and hold R button to toggle raise setting (ºC or ºF)
7. Do nothing for 10 seconds to accept new setting OR Press L&R button simultaneously for 2 seconds
to accept new setting (Display will show main menu again)
5.5 Debugging the system
5.5.1 Observing the return temperature and fault codes
The temperature and fault codes are displayed through the four position LED. The return
temperature is displayed if the unit is operating normally. If there is an alarm, the fault code is
displayed. The following faults may be shown:
F=01 (missing compressor current)
F=02 (High Pressure)
F=03 (Low Pressure after start up)
F=04 (Low Pressure before start up)
F=05 (High Temperature)
F=06 (Low Temperature)
F=07 (Missing Sensor)
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