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Controls
Low Pressure Protection Control
The system will shut the compressor down if the low pressure switch opens for a short time and display an
E3 error code. The system will automatically restart the compressor when the switch closes after a short
time delay. The system will shut the compressor down if the switch subsequently opens again within a
predetermined time and will require a power reset to restart.
High Temperature Prevention Control
The system will enable high temperature prevention control while in heating mode if the indoor coil
temperature rises above a predetermined threshold. The outdoor fan will slow down during high temperature
protection mode.
Discharge High Temperature Protection Control
System will enable discharge temperature protection control if the discharge high temperature sensor is
detected open for a predetermined amount of time. The system will shut down and display error code E4
during high temperature protection. The system will restore operation when the discharge temperature
drops below the safety threshold. The system will lock out if high discharge temperature is sensed again
during a certain time period and power must be reset to the unit.
Functions
Capacity Selection
Set the capacity of the outdoor unit through DIP switch SA2-1 on the outdoor unit main control board.
24K
On
Off
1
2
Set Defrost Mode
DIP switch SA2-2 on the outdoor unit main control board determines the defrost mode. The following is an
example of the defrost setting for a 36k unit. Standard Defrost is default, and Strong Defrost is suitable for
defrosting in ultra-low temperature environments.
Outdoor DIP SA2-1
AUH2436ZGDA
36K
On
Off
3
4
1
2
3
Indicates switch position
Outdoor DIP SA2-2
Standard Defrost (default)
On
Off
1
2
3
Indicates switch position
CONNECT SERIES SERVICE MANUAL
AUH4860ZGDA
48K
On
Off
4
1
2
3
Strong Defrost
On
Off
4
1
2
3
4
60K
On
Off
4
1
2
3
4
7
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Troubleshooting
