Malfunctions; Sensor Malfunction Detection; Detection Of Overload And Over Current - Daikin Altherma EKHBH Series Service Manual

ESIE06-03
3.12

Malfunctions

Overview This chapter contains the following topics:
Topic
3.12.1–Sensor Malfunction Detection
3.12.2–Detection of Overload and Over Current
3.12.3–Insufficient Gas Control

3.12.1 Sensor Malfunction Detection

General Sensor malfunction may occur either in the thermistor or current transformer (CT) system.
Relating to
thermistor
malfunction
Relating to CT When the output frequency is more than 55 Hz and the input current is less than 0.5A, carry out
malfunction abnormal adjustment.

3.12.2 Detection of Overload and Over Current

Outline In order to protect the inverter, detect an excessive output current, and for protecting compressor,
monitor the OL operation.
Detail If the OL (compressor head) temperature exceeds 120~130°C (depending on the model), the
compressor gets interrupted.
If the inverter current exceeds 30 A, the compressor gets interrupted too.
Part 2 – Functional Description
Outdoor heat exchanger thermistor
Discharge pipe thermistor
Fin thermistor
Outside air thermistor
Outdoor Unit Functional Concept
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