Danfoss DHP-AL Installation And Service Instructions Manual page 29

HYSTERESIS
In order to start the heat pump in advance during sudden changes of the heat demand, there is a value, HYSTERESIS, which controls the
difference between the actual supply temperature, t
the set HYSTERESIS value (x), i.e. there is a heat demand, or the heat demand disappears, quicker than the usual integral calculation, the
integral value is forced to either the start value INTEGRAL A1 or to the stop value 0°min.
SUPPLY TEMP.
INTEGRAL
and the calculated supply temperature, t
1
HYSTERESIS
(∆t) ≥ x
Compressor start
(-60)
Figure 51: Conditions for HYSTERESIS to force the integral value to change.
VMBME102
. If the difference is the same or greater than
2
t
1
t
2
HYSTERESIS
(∆t) ≥ x
TIME
Compressor stop
(0)
29