8 C6.1.6/1108-0509/E
Events LEDs Events LEDs
Unit Off / Phase “U” or “N” missing Off
When com-
pressor On
Power On W/O error
DLT Thermistors Failure
When com-
pressor On
Compressor On W/O error
PHE Vapour Inlet Temp.
Sensor Failure (only ZXL)
When com-
pressor On
Compressor about
to turn On O,1
W/O error
PHE Vapour Outlet Temp.
Sensor Failure (only ZXL)
When com-
pressor On
Defrost W/O error
Try to
restart
Try to
restart
Compressor High Pressure
Cut-out
System lock
Discharge Gas
Overheat Error
System lock
Compressor Low Pressure
Cut-out
Try to
restart
When com-
pressor On
Try to
restart
Outdoor Ambient
Temp. Sensor
Failure
When com-
pressor Off
Compressor Over Current
System lock
When com-
pressor On
Compressor Wrong Phase
Sequence / Loss of Phase
System lock
Condenser Mid-coil
Temp. Sensor
Failure
When com-
pressor Off
Warning – System Liquid
Floodback
When com-
pressor On
Warning – Compressor intends to start but current transformers sense no current
Table 6: Common signals
2.9 Compressor / Unit setting
Each ZX unit model has a unique compressor model and this has to be programmed in the set-
up of the electronic board controller. For this purpose a compressor rotary switch is located near
the top right-hand corner of the electronic board (shown on Fig. 1 above). This is factory set and
should not be re-set after leaving the factory. Any tampering with this compressor rotary switch
may result in any warranty claim becoming null and void.
For maintenance purpose, the electronic board (replacement) needs to be configured according
to the compressor use (please see underneath settings to be done on the electronic board).
Compressor Model**
2-bit Dip-switch 3-bit Dip-switch
0 On/On Off/Off/Off
ZX15KCE-TFD 1 On/On
ZX21KCE-TFD 2 On/On
ZX30KCE-TFD 3 On/On
ZX38KCE-TFD 4 On/On
ZX45KCE-TFD 5 On/On
ZX51KCE-TFD 6 On/On
Evaporator fan
On/Off logic
same as
compressor
Table 7: Setting of switches
NOTE: Please set switches to the right position according to compressor model.
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