Danfoss DHP-AX, Инструкция по установке и обслуживанию

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Service – 27 VMBMH302
The integral value is a measurement of the surface under the time axle and is expressed in degree minutes. The
figure below shows the factory settings for the integral values that the heat pump has. When the integral value
has reached the set value for INTEGRAL A1, the compressor starts and if the integral value does not drop but
continues to rise, the auxiliary heater starts when the integral value has reached the set value for INTEGRAL
A1+A2.
Figure 23: Starting and stopping heat pump operation based on integral values.
The calculation of the integral value stops during heat stop. Integral value calculation resumes two minutes
after completed hot water production to give the heating system time to stabilise the temperature.
11.5.8 HYSTERESIS
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 tempera-
ture, 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 24: Conditions for HYSTERESIS to force the integral value to change.
HYSTERESIS
(∆t) ≥ x
Compressor start
(-60)
Compressor stop
(0)
t
1
t
2
HYSTERESIS
(∆t) ≥ x
TIME
INTEGRAL
SUPPLY TEMP.
Heat surplus
Integral
INTEGRAL A1
Heat surplus
Heating deficit
Compressor start (A1)
INTEGRAL A2
INTEGRAL A1
INTEGRAL A2
Aux. heater start
(A1+A2)
Compressor stop (≥0)
Aux. Heater stop
(latest by A1)
Aux. heater
Compressor
No operation No operation
Compressor start
(A1)
Aux. heater start
(A1+A2)
Aux. heater
Compressor
Time
Heat pump operation
(Heat demand)