Nibe F2040 Technical Manual

Expansion valves (EEV)
Cooling mode
EEV-C regulates so that overheating is 4 K.
EEV-H is fully open when the compressor is in opera-
tion.
Heating mode
EEV-H regulates so that overheating is between 3 and
5 K.
EEV-C controls so that sub-cooling is as shown in the
diagram.
Outdoor temperatureTho-A (°C)
Temperature difference between incoming and outgoing
liquid
Set point value
subcooling
Zone A
Zone B
Zone B
Zone A
Defrosting
Start conditions for defrosting
If the following conditions A or B are fulfilled the de-
frosting starts.
Defrosting conditions A:
■
a) When the accumulated run time for the com-
pressor exceeds 37 minutes after the previous defrost-
ing, and more than 30 minutes after heating opera-
tion started.
■
b) At least 5 minutes after the compressor started.
■
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 temper-
ature (Tho-A) is in the temperature range for de-
frosting 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 c2:
- Less than 10 minutes have passed since the com-
pressor started.
- The outdoor temperature is greater than +4 °C.
- 10
6
- 24
- 15- 18
- 31
- 6
6
- 20
- 20 - 18
- 27
Tho-R
(Lowest value
if there is
more than one
sensor.)
(°C)
Temperature zone defrosting
start
Temperature zone defrosting
start
SST (°C)
Tho-A (°C)
Tho-A (°C)
Threshold value when
SW3-1 was started
Threshold value when
SW3-1 was started
Defrosting conditions B:
21Chapter 4 | Description of functionsNIBE™ F2040

Nibe F2040 Specifications

General

Type	Air/water heat pump
Refrigerant	R410A
Operating Temperature Range Heating	-20°C to 35°C
Operating Temperature Range Cooling	10°C to 46°C
Sound Power Level	56-62 dB(A) (depending on model)