CONDITIONS DURING DEFROSTING
• When the defrosting conditions are met, the outdoor
unit waits 40 seconds to confirm it. If the defrosting
conditions are changed during the 40 secs. Defrosting
will not start.
• EEV-C opens fully and the compressor speed is set
to A rps.
B rpsA rps
5520Speed AMS 10-6
5025Speed AMS 10-8
5625Speed AMS 10-
12/-16
• The 4-way valve switches after 5 seconds (AMS10-6),
1 second (AMS10-8) or 20 seconds (AMS10-12) after
the compressor speed reaches A rps or lower.
The fan is stopped when the fourway valve switches.
• EEV-H is fully open and the compressor speed is fixed
for 1 minute to prevent low pressure.
• The target speed for the compressor is then set to
B rps, the acceleration is 2 rps/10 seconds for AMS10-
12 if the low pressure is greater than 0.53 MPa (-7 °C).
For AMS10-8, the compressor speed is regulated
every five seconds to prevent the water temperature
or low pressure falling.
• EEV-C regulates to 5 K in the event of overheating.
• EEV-H regulates to 0.82 MPa at low pressure.
• The fan is not active during defrosting. Other circum-
stances may make the fan rotate.
21Chapter 4 | Description of functionsNIBE AMS10
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