Pressure Equalization Control; Opening Limit; Starting Operation Control; High Temperature Of The Discharge Pipe - Daikin Altherma EKHBH Series Service Manual

ESIE06-03

3.11.2 Pressure Equalization Control

When the compressor is stopped, open and close the electronic expansion valve and develop
pressure equalization.

3.11.3 Opening Limit

Outline Limit a maximum and minimum opening of the electronic expansion valve.
Detail
The electronic expansion valve is opened with fixed opening during defrosting.

3.11.4 Starting Operation Control

Control the electronic expansion valve opening when the system is starting, and prevent the system
to be super heated or moistened.

3.11.5 High Temperature of the Discharge Pipe

When the compressor is operating, if the discharge pipe temperature exceeds a certain value, open
the electronic expansion valve and remove the refrigerant to the low pressure side and lower
discharge temperature.
3.11.6 Disconnection of the Discharge Pipe Thermistor
Outline Disconnection of the discharge pipe thermistor is detected by comparing the discharge pipe
temperature with the heat exchanger temperature. If any is disconnected, open the electronic
expansion valve according to the outdoor air temperature and the operating frequency, and operate
for 9 minutes, and then stop.
After 3 minutes of waiting, the compressor restarts and the same process is carried out again. If the
disconnection is detected 4 times in succession, then the system will be down.
When the compressor runs for 60 minutes without any error, the error counter will reset itself.
Part 2 – Functional Description
A maximum electronic expansion valve opening: 480 pulses
A minimum electronic expansion valve opening: 54 pulses
Outdoor Unit Functional Concept
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