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value -16 for DEFR CURVE -16 is the set value for OUTDOOR STOP, so if the value for
OUTDOOR STOP changes, the numbers behind DEFR CURVE also change.
Factory setting for OUTDOOR STOP is -16°C. At this outdoor temperature, compres-
sor operation is stopped and the addition takes over. It is seldom that the value of
OUTDOOR STOP needs to be changed, tests and operating cases have shown that
-16°C operates very well as the stop temperature. In the text and figures below the
value -16°C has been used for OUTDOOR STOP.
The display shows the value for DEFR CURVE 0 and DEFR CURVE –20 by means of a
graph in the character window.
Temperature, incoming refriger-
ant pipe
Set value for
DEFR CURVE [value
OUTDOOR STOP]
Figure 10: Graph that shows how the value for DEFR CURVE 0 can be set.
The value for OUTDOOR STOP that is set means that the compressor will no longer
be used for heating or hot water production if the outdoor temperature is the same
as or lower than the value. Heating and hot water production then occurs with the
help of the auxiliary heater.
The value for DEFR CURVE 0 is the temperature that the refrigerant return is permit-
ted to reach when a defrost must start at outdoor temperature 0°C.
In the corresponding way the value for DEFR CURVE -16 is the temperature that
the refrigerant return has when a defrost should start at the set outdoor tempera-
ture for OUTDOOR STOP. The setting for DEFR CURVE –20 means that the value
OUTDOOR STOP (-16°C) is reduced by between 1 and 5 degrees. This also deter-
mines how much lower the temperature for the refrigerant return may be than
-16°C in this case.
-10
-10
Set value for OUTDOOR STOP
VUBMI102
Settable value for incoming refri-
gerant temperature at 0°C outdoor
temperature is -5°C to -15°C
Outdoor temperature
DHP-AX – 17
efri-
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