The compressor stops when BT15 or BP4 reaches 65 °C
and restarts when the temperature reaches or drops
below 47 °C.
The compressor stops when Tho-R reaches 65 °C and
restarts when the temperature reaches or drops below
51 °C.
Cooling operation:
The speed of the compressor decreases by 4 rps every
minute when Tho-R is 60 °C, at the same time as the
high pressure switch is deployed.
The cut-out point is reduced by 2 °C every time the high
pressure switch deploys, down to 54 °C.
Stop with manual reset:
The compressor is stopped with error code 35 (Error
code only applies to ACVM270):
• if the pressure switch trips 5 times within 60 minutes.
• If the break temperature for the compressor is reached
for more than 60 minutes.
LOW PRESSURE CONTROL
Speed control of the compressor:
The speed of the compressor decreases by 4 rps every
30 seconds if the low pressure is 0.15 MPa or lower for
more than 10 seconds. The function is stopped when
the low pressure is 0.189 MPa or greater.
Stopped compressor:
When one of the following conditions is met, the com-
pressor stops.
• The low pressure is less than 0.015 MPa for more
than 15 seconds.
• The low pressure is less than 0.15 MPa and overheat-
ing is greater than 30 °C for more than 60 seconds.
Compressor operation is resumed automatically when
the low pressure is 0.227 MPa or greater.
Stop with manual reset:
If the above occurs 3 times within 60 minutes, or the
low pressure is less than 0.079 MPa for more than 5
minutes, the compressor stops with error code E49
(Error code only applies to ACVM270)
High compression ratio (Applies only to AMS
10-12/-16):
If the low pressure is less than 0.28 MPa and if the liquid
line sensor or condensing temperature is greater than
50 °C, the compressor speed can be lowered.
27Chapter 4 | Description of functionsNIBE AMS10
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