Freeze-Up Protection Control - Daikin FTXS09HVJU Service Manual

SiUS04-904
The frequency control is made within the following zones.
Detail
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
2. In case the operation mode is heating
 The current drops when outdoor air temperature becomes higher than a certain level (model by
3.6

Freeze-up Protection Control

Outline During cooling operation, the signals being sent from the indoor unit allow the operating frequency
limitation and then prevent freezing of the indoor heat exchanger. The signal from the indoor unit
must be divided into the zones as shown in the following diagram:
Detail
Conditions for Start Controlling
Judge the controlling start with the indoor heat exchanger temperature after 2 seconds from
operation start.
Control in Each Zone
Function and Control
2 Hz dropping
1.0 second after
rushing in the
dropping zone
dropping current" continues for 1.0 second after rushing on the
dropping
dropping
model).
model).
Input current
dropping
continues until the current remains in the
and stop value according to the outdoor air temperature
Control Specification (09/12 Class)
Dropping zone
dropping zone, the frequency is
zone without
dropping
Dropping zone
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