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Outdoor Unit Functional Concept
ESIE06-03
2–12
Part 2 – Functional Description
3
1
2
4
5
3.2
Frequency Principle
Main control
parameters
The compressor is frequency-controlled during normal operation. The target frequency is set by the
following 2 parameters coming from the operating hydro-box:
P
The load condition of the operating hydro-box
P
The difference between the water temperature and the set temperature
Additional control
parameters
The target frequency is adapted by additional parameters in the following cases:
P
Frequency restrictions
P
Initial settings
P
Forced cooling operation
Inverter principle
To regulate the capacity, a frequency control is needed. The inverter makes it possible to vary the
rotation speed of the compressor. The following table explains the conversion principle:
Drawing of inverter
The following drawing shows a schematic view of the inverter principle:
Phase
Description
1
The supplied AC power source is converted into the DC power source for the present.
2
The DC power source is reconverted into the three phase AC power source with varia-
ble frequency.
P
When the frequency increases, the rotation speed of the compressor increases
resulting in an increased refrigerant circulation. This leads to a higher amount of the
heat exchange per unit.
P
When the frequency decreases, the rotation speed of the compressor decreases
resulting in a decreased refrigerant circulation. This leads to a lower amount of the
heat exchange per unit.
50 Hz
Refrigerant circulation rate (high)
Amount of heat
exchanged (large)
Amount of heat
exchanged (small)
AC
po
w
e
r
freq=
constant
DC
po
w
e
r
Amount of heat
exchanged (large)
Amount of heat
exchanged (small)
high f
low f
freq=variable
capacity=
variable
Refrigerant circulation rate (low)
high speed
low speed
Summary of Contents for Altherma EKHBH Series
Page 2: ...ESIE06 03 1 2 Part 1 System Outline 3 1 1 5 ...
Page 26: ...Functional Diagrams ESIE06 03 1 26 Part 1 System Outline 3 1 1 4 5 ...
Page 32: ...Piping Diagrams ESIE06 03 1 32 Part 1 System Outline 3 1 1 4 5 ...
Page 38: ...Switch Box Layout ESIE06 03 1 38 Part 1 System Outline 3 1 1 4 5 ...
Page 58: ...PCB Layout ESIE06 03 1 58 Part 1 System Outline 3 1 1 4 5 ...
Page 60: ...ESIE06 03 2 2 Part 2 Functional Description 3 1 2 5 ...
Page 68: ...Hydro box Functional Concept ESIE06 03 2 10 Part 2 Functional Description 3 1 2 4 5 ...
Page 88: ...ESIE06 03 3 2 Part 3 Troubleshooting 3 1 3 5 ...
Page 134: ...Error Codes System Malfunctions ESIE06 03 3 48 Part 3 Troubleshooting 3 1 3 4 5 ...
Page 152: ...Additional Checks for Troubleshooting ESIE06 03 3 66 Part 3 Troubleshooting 3 1 3 4 5 ...
Page 154: ...ESIE06 03 5 2 Part 5 Disassembly and Maintenance 3 1 5 ...