![background image](http://html.mh-extra.com/html/daikin/altherma-ekhbh-series/altherma-ekhbh-series_service-manual_501281073.webp)
ESIE06-03
Outdoor Unit Functional Concept
Part 2 – Functional Description
2–15
3
2
4
5
1
Indoor frequency
command (
∆
D
signal)
The difference between the outlet water temperature and the temperature set by the remote controller
will be taken as the “
∆
D signal” and is used for frequency command.
Frequency initial
setting
When starting the compressor, or when conditions are varied due to the change of the room, the
frequency must be initialized according to the total of a maximum
∆
D value of the hydro-box and the
Q value of the hydro-box.
Q value: hydro-box output determined from hydro-box.
PI Control
(determine
frequency up/down
by
∆
D signal)
P
P control
Calculate
∆
D value in each sampling time (20 seconds), and adjust the frequency according to its
difference from the frequency previously calculated.
P
I control
If the operating frequency is not change more than a certain fixed time, adjust the frequency up
and down according to the
∆
D value, obtaining the fixed
∆
D value.
When the
∆
D value is small...lower the frequency.
When the
∆
D value is large...increase the frequency.
P
Limit of frequency variation width
When the difference between input current and input current drooping value is less than 1.5 A, the
frequency increase width must be limited.
P
Frequency management when other controls are functioning
P
When frequency is drooping;
Frequency management is carried out only when the frequency droops.
P
For limiting lower limit
Frequency management is carried out only when the frequency rises.
P
Upper and lower limit of frequency by PI control
The frequency upper and lower limits are set depending on hydro-box.
When outdoor unit low noise or quiet commands come from hydro-box, the upper limit frequency
must be lowered than the usual setting.
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 ...