Insufficient Gas Control; Judgment By Input Current - Daikin Altherma EKHBH Series Service Manual

Outdoor Unit Functional Concept

3.12.3 Insufficient Gas Control

1
Outline
2
3
4
5
Judgment by input
current
Judgment by
discharge pipe
temperature
2–28
If a power consumption is below the specified value in which the frequency is higher than the specified
frequency, it must be regarded as gas insufficient.
In addition to such conventional function, if the discharge temperature is higher than the target
discharge pipe temperature, and the electronic expansion valve is fully open (450 pulses) more than
the specified time, it is considered as an insufficient gas.
With the conventional function, a power consumption is weak comparing with that in the normal
operation when gas is insufficient, and gas insufficiency is detected by checking a power
consumption.
When operating with insufficient gas, although the rise of discharge pipe temperature is great and the
electronic expansion valve is open, it is presumed as an insufficient gas if the discharge pipe
temperature is higher than the target discharge pipe temperature.
When an output frequency is exceeds 40 Hz and the input current is less than specified value, the
adjustment is made for insufficient gas.
When discharge pipe temperature is 20~45°C (depending on the model or mode) higher than target
value and the electronic expansion value opening is 480 pulse (max.), the adjustment is made for
insufficient gas.
Insufficient gas zone
55 Hz Frequency
Gas insufficient
zone
ESIE06-03
Part 2 – Functional Description