Sinclair SCV-EB Series Service Manual page 19

5.3 Discharge temperature protection control
This control protects the compressor from abnormally high temperatures and transient spikes in temperature.
When the discharge temperature rises above 115°C the system displays P4 protection and the unit stops running. When
the discharge temperature drops below 95°C, the compressor enters re-start control.
Tp ＜Th for more than 12 minutes
Notes:
T : Discharge temperature
p
T : Suction temperature
h
When the discharge temperature is lower than suction temperature for more than 12 minutes after compressor runs, the
system displays EA protection and heat pump stops running. After 3 minutes, the compressor enters re-start control
automatically.
If EA protection occurs 3 times within 2 hours, heat pump cannot be restarted unless it is powered on again.
5.4 Compressor current protection control
This control protects the compressor from abnormally high currents.
Current limitation for heat pump
Model name
Current
max
When the heat pump current rises above Current
the heat pump current drops below Current
Normal operation
Tp > 115°C
High discharge temperature protection, error code P4 is displayed
Low discharge temperature protection, error code EA is displayed
Current > Current
max
Compressor current protection, error code P3 is displayed
SCV-50/70/100EB
18A
max
, the compressor enters re-start control.
max
Tp < 95°C
Normal operation
Normal operation
Current < Current
SCV-120/140/160EB
30A
the system displays P3 protection and the unit stops running. When
After 3 minutes
max
SCV-120/140/160EB-3
14A
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