fujitsu ducted condensation control nightmare

[gille]

I have 2 units Fujitsu ARY 60 UUAK / AOY 60 UMAYT with same problem - from time to time it goes to high pressure alarm. After a while get high pressure switch shortcircuited. I observed what is going on, and measured pressures. On outdoor unit fans start at low speed, and high speed is switched on at 37 bar. I think high speed should be switched earlier. What is reason for this? Electronics fault, program or sensor.

[bigor_2]

Hi Gille,

in cooling mode speed of outdoor fan set ambient thermistor. Can be an ambient temperature became low +5C?

[gille]

You are right, I'll have to check thermistor, but I do not have ohm/temp table, maybe i could try to relocate thermistor.
Thank you.

[bigor_2]

see http://www.refrigeration-engineer.com/forums/showpost.php?p=206410&postcount=26

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