ENGLISH
15
EN
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 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), that is, 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 11: Conditions for HYSTERESIS to force the integral value to change .
DEFR CURVE, defrosting curve for Geysir Air .
When defrosting the outdoor unit of Geysir Air, the control computer makes a calculation
using a combination of the temperature on the incoming supply line and outdoor temperature.
What guides the calculation is a linear defrosting curve that can be set so that the heat
pump and outdoor unit work optimally. The setting of three different values can be changed:
OUTDOOR STOP, DEFR CURVE 0 and DEFR CURVE [value OUTDOOR STOP ]. The de-
frosting sequence starts when the temperature of the incoming brine line reaches the outdoor
temperature somewhere along the set defrosting curve. The control computer shows the
value for DEFR CURVE 0 and DEFR CURVE [value OUTDOOR STOP] by means of a graph
in the display.
HYSTERESIS
(∆t) ≥ x
Compressor start
(-60)
Compressor stop
(0)
t1
t2
HYSTERESIS
(∆t) ≥ x
TIME
INTEGRAL
SUPPLY TEMP.