Danfoss DHP-AL, User Manual

Page: 13 / 42

Danfoss – 13
VUBMF102
The integral value calculation stops during hot water production and during heat stop.
Integral value calculation resumes two minutes after completed hot water production to give
the heating system time to stabilise the temperature.
HYSTERESIS
The information below tells you how your heat pump works, there are no values that you as a
customer have to set.
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,
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 integral value is forced to either the start value
INTEGRAL A1 or to the stop value 0°min.
Figure 9: Conditions for HYSTERESIS to force the integral value to change .
HYSTERESIS
(∆t) ≥ x
Compressor start
(-60)
Compressor stop
(0)
t1
t2
HYSTERESIS
(∆t) ≥ x
TIME
INTEGRAL
SUPPLY TEMP.