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Outdoor Unit (50/60 class)
Si21-205
108
Function and Control
3.5
Discharge Pipe Temperature Control
Outline
The discharge pipe temperature is used as the compressor's internal temperature. If the
discharge pipe temperature rises above a certain level, the operating frequency upper limit is
set to keep this temperature from going up further.
Detail
Divide the Zone
Management within the Zones
3.6
Input Current Control
Outline
Detect an input current by the CT during the compressor is running, and set the frequency
upper limit from such input current.
In case of heat pump model, this control is the upper limit control function of the frequency
which takes priority of the lower limit of four way valve activating compensation.
Detail
The frequency control will be made within the following zones.
When a “stop current” continues for 2.5 seconds after rushing on the stop zone, the compressor
operation stops.
If a “drooping current” is continues for 1.0 second after rushing on the drooping zone, the
frequency will be 2 Hz drooping.
Repeating the above drooping continues until the current rushes on the drooping zone without
change.
In the unchanged zone, the frequency limit will remain.
In the return / reset zone, the frequency limit will be cancelled.
Limitation of current drooping and stop value according to the outdoor air temperature
1. In case the operation mode is cooling
The current droops when outdoor air temperature becomes higher than a certain level
(model by model).
2. In case the operation mode is heating (only for heat pump model)
The current droops when outdoor air temperature becomes higher than a certain level
(model by model).
Zone
Control contents
Stop zone
When the temperature reaches the stop zone, stop the compressor and
correct abnormality.
Drooping zone
Start the timer, and the frequency will be drooping.
Unchanged zone
Keep the upper limit of frequency.
Return / Reset zone
Cancel the upper limit of frequency.
A
B
C
D
(R2836)
A
B
C
D
110
103
102
101
Reset zone
After 2.5 seconds
Compressor stops
Stop zone
Drooping zone
Unchanged
zone
Input current
drooping
2 Hz drooping
1.0 second after
rushing in the
drooping zone
Summary of Contents for Sky Air B-Series R-410A
Page 7: ...Si21 205 vi Table of Contents ...
Page 15: ...Models Si21 205 4 Model Name and Power Supply ...
Page 16: ...Si21 205 Functions 5 Part 2 Functions 1 List of Functions 6 ...
Page 35: ...Wireless Remote Controller Si21 205 24 Remote Controller ...
Page 79: ...Settings Concerning Maintenance Si21 205 68 Field Setting Detail of PCB 2 ...
Page 83: ...Maintenance Mode Setting Si21 205 72 Field Setting ...
Page 239: ...Troubleshooting for Outdoor Unit 50 60 class Si21 205 228 Troubleshooting ...
Page 321: ...Outdoor Unit 50 60 class Si21 205 310 Removal Procedure ...