Danfoss DHP-H Installation And Service Instructions Manual page 33

HYSTERESIS
In order to start the heat in advance during sudden changes of the heat demand, there is a value, HYSTERESIS, which controls the differ-
ence between the actual supply temperature, t1 and the calculated supply temperature, t2. If the difference is the same or greater than the
set HYSTERESIS value (x), i.e. there is a heat demand, or the heat demand disappears, quicker than the usual integral calculation, the inte-
gral value is forced to either the start value INTEGRAL A1 or to the stop value 0°min.
SUPPLY TEMP.
INTEGRAL
HYSTERESIS
(∆t) ≥ x
Compressor start
(-60)
Figure 58: Conditions for HYSTERESIS to force the integral value to change .
t
1
t
2
HYSTERESIS
(∆t) ≥ x
Compressor stop
(0)
VMBMA102
TIME