Daikin Multisplit 4MXS80E high current

[janramon]

Daikin inverter 4mxs80E with 2 x 2,5KW innside units (4mxs80E2V3B, FTXS25G2V1B, FTXS25CVMB8)
Problem : always high amp draw (approx.18 amps), compressor the same frequency in forced mode as when 1 or 2 units on.
I cannot find out if it is the compressor or the PCB!
I already know that it's not under or overcharge.

What should be the current draw when in forced cooling mode ?

In heating mode the compressor works perfect, its frequency lowers (very silent, also the fan lowers in frequency)

Thanks for helping!
JRS

[nike123]

Compressor frequency depend on some inputs. If one of those inputs are wrong, than control is wrong.
I would start with checking thermistors which deal with cooling control.

[janramon]

Hi,
I checked all thermistors they are ok...

In the manual is written that you have to connect a minimum of 2 inside units.
Is this because of a minimum rpm output of the compressor in cooling mode?
If you turn on one unit then the cooling works so why a minimum of 2 units?

I tried to fake some sensors (heating up the discharge pipe thermistor) but nothing happens. Should lower the rpm I think.
Is 55hz already the minimum rpm of the compressor when connected to 2 inside units 2,5KW?

[nike123]

Sorry I am not that familiar with Daikin multi splits.

[install monkey]

in cooling mode ur compressor current is always less,as is your maximum frequency18amp is way too high, is your reversing valve ok as u say it works ok in heating but runs flat out in cooling, and u say the gas charge is correct

[janramon]

Thanks for the replies.
Iam going to replace the compressor.
Hope this is the problem.
Will be back.
Greetz
JRS