Control Specification SiUS12-814
44 Function and Control
3.4 Discharge Pipe 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 Zone
3.5 Input Current Control
Outline Detect an input current by the CT while the compressor is running, and set the frequency upper
limit according to this 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 dropping current is continues for 1.0 second after rushing on the dropping zone, the
frequency will be 2 Hz dropping .
Repeating the above dropping continues until the current rushes on the dropping 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 dropping and stop value according to the outdoor air temperature
1. In case the operation mode is cooling:
The current drops 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 drops 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.
Dropping zone Start the timer, and the frequency will be dropping .
Keep zone Keep the frequency upper limit.
Return / Reset zone Cancel the frequency upper limit.
(R4576)
A
B
C
D
248
231.8
228.2
224.6
A°F
B°F
C°F
D°F
Keep zone
Dropping zone
(R4577)
Keep zone
dropping
dropping
dropping zone
Dropping zon
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