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Outdoor Unit Functional Concept
ESIE06-03
2–14
Part 2 – Functional Description
3
1
2
4
5
3.3
Frequency Control
Outline
Frequency will be determined according to the difference between water and set temperature.
The function is explained as follows.
P
How to determine frequency.
P
Frequency command from a hydro-box (the difference between the water temperature and the
temperature set by the remote controller).
P
Frequency command from a hydro-box.
P
Frequency initial setting.
P
PI control.
How to determine
frequency
The compressor’s frequency will finally be determined by taking the following steps.
For heat pump
model
P
Determine command frequency
Command frequency will be determined in the following order of priority.
P
Limiting frequency by drooping function
Input current, discharge pipes, low Hz high pressure limit, peak cutting, freeze prevention, fin
thermistor temperature.
P
Limiting defrost control time
P
Forced cooling
P
Indoor frequency command
P
Determine upper limit frequency
Set a minimum value as an upper limit frequency among the frequency upper limits of the following
functions:
Compressor protection, input current, discharge pipes, Low Hz high pressure, peak cutting, freeze
prevention, defrost.
P
Determine lower limit frequency
Set a maximum value as an lower limit frequency among the frequency lower limits of the following
functions:
Four way valve operating compensation, pressure difference upkeep.
P
Determine prohibited frequency
There is a certain prohibited frequency such as a power supply frequency.
Command frequency
Limit frequency
Skip control
Upper limit function
Compressor protection function
Lower limit function
Four-way valve operating compensation, etc.
Initial frequency
PI control
Defrost control
Drooping function
Input current control, etc.
Upper limit frequency
FMAX
Lower limit
frequency
Target frequency
Command frequency X repeats when frequency becomes lower
Frequency changes by PI control < repeats when frequency becomes lower
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 ...