Discharge Pipe Temperature Control; Input Current Control - Daikin FTXS09HVJU Service Manual

SiUS04-904
4.4

Discharge Pipe Temperature Control

The discharge pipe temperature is used as the compressor's internal temperature. If the discharge
Outline
pipe temperature rises above a certain level, the operating frequency upper limit is set to keep this
temperature from going up higher.
Detail Divide the Zone
Management within the Zones
4.5

Input Current Control

Detect an input current by the CT during the compressor is running, and set the frequency upper
Outline
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 is 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 "
reduced by 2 Hz.
Repeating the above
change.
In the keep zone, the frequency limit remains.
In the return / reset zone, the frequency limit is cancelled.
Limitation of current
1. In case the operation mode is cooling
 The current drops when outdoor air temperature becomes higher than a certain level (model by
Function and Control
A°F
B°F
Zone
Stop zone When the temperature reaches the stop zone, stop the compressor and
correct abnormality.
Dropping zone Start the timer, and the frequency is dropping.
Keep zone Keep the upper limit of frequency.
Return / Reset zone Cancel the upper limit of frequency.
2 Hz dropping
1.0 second after
rushing in the
dropping zone
Input current
dropping
dropping current" continues for 1.0 second after rushing on the
dropping
dropping
Dropping zone
C°F
Keep zone
D°F
Control contents
continues until the current remains in the
and stop value according to the outdoor air temperature
Control Specification (15/18/24 Class)
A 230
B 217.4
C 215.6
D 213.8
(R5470)
Dropping zone
dropping zone, the frequency is
zone without
dropping
53