Defrosting
START CONDITIONS FOR DEFROSTING
If the following conditions A or B are met, defrosting
starts (Does not apply to AMS 10-6).
Defrosting conditions A:
• a) When the accumulated operating time for the
compressor exceeds 37 minutes after the previous
defrosting, and more than 30 minutes after the previ-
ous start of heating operation.
• b) At least 5 minutes have passed after compressor
start.
• c) When one of the following conditions is met:
– c1) When the association between the outdoor unit’s
heat exchanger temperature (Tho-R1 or -R2,
whichever is the lowest) and the outdoor temperat-
ure (Tho-A) is in the temperature range for defrosting
start.
– c2) When the association between the suction gas
evaporation temperature (SST) and Tho-A is within
the temperature range.
Defrosting will not start under the following condi-
tions:
- Less than 10 minutes have passed since the
compressor started.
- The outdoor temperature is higher than 4°C.
Condition c1
-20 -18 0 6
-27
-20
-6
Lägsta temperaturen av Tho-R1 och Tho-R2
(°C)
Uteluftstemperatur Tho-A
(°C)
DIP-switch SW3-1 OFF
DIP-switch SW3-1 ON
Temperature Tho-R1/R2
(°C)
Outdoor air temperature Tho-
A
(°C)
DIP switch SW3-1 ON
DIP switch SW3-1 OFF
Defrosting range
Condition c2
-18 -15 0 6
-31
-24
-10
Förångningstemperaturen SST
(°C)
Uteluftstemperatur Tho-A
(°C)
DIP-switch SW3-1 OFF
DIP-switch SW3-1 ON
Evaporation temperature SST
(°C)
Outdoor air temperature Tho-
A
(°C)
Defrosting range
DIP switch SW3-1 ON
DIP switch SW3-1 OFF
Defrosting conditions B:
• a) Defrosting can be started when the accumulated
operating time for the compressor has reached 30
minutes, if the previous defrosting was concluded
because of “max. defrosting time”.
• b) At least 5 minutes have passed after compressor
start.
You can find information about DIP switches on page
60.
Defrosting AMS 10-6
Defrosting starts if all the conditions below are satisfied.
Defrosting conditions:
• a) When the accumulated operating time for the
compressor exceeds 35 minutes after the previous
defrosting and 35 minutes after previous start of
heating operation.
• b) The temperature sensor Tho-R (BT28) has been
lower than -5 °C for three minutes.
• c) The temperature sensor Tho-R minus Tho-R is
greater than or equal to 7 °C.
Condition AMS10-6
-20 -15 0 2
-29
-22
-5
Värmeväxlartemperaturen Tho-R
(°C)
Uteluftstemperatur Tho-A
(°C)
Heat exchanger temperature Tho-R
(°C)
Outdoor air temperature Tho-
A
(°C)
Defrosting range
NIBE AMS10Chapter 4 | Description of functions20
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