DAIKIN VRV 111 fault

[frank]

Liquid floodback should not be a problem as there is a large suction accumulator in the circuit.

In Heating mode, even when indoor units are not 'On' or called for, the EEV passes a small amount of hot gas through the indoor fancoil to prevent liquid (and oil) accumulating - I assume that this is what you are hearing.

Frosting on the Suction line at the indoor fancoil in Heating mode is not right as this should be Hot Gas?

As with all VRV's (VRF's), they are a critical charge system, so if you are having issues with frost etc. where you normally wouldn't see it, I would be making sure that the charge was correct (de-gas and weigh) before checking for other issues (sensor calibration, strainer blockage, faulty vale etc.).

One other thing to look for if it is not a system that you have installed is that the pipework is installed within the maximum allowed lengths. If fancoils are outside of these limits, they tend to collect oil (low suction velocities) which then lead to compressor failures.

To reset the entire system to Factory condition is to press and hold the 'Reset' binary button on the Master outdoor for 20 seconds (IIRC).

[chillyblue]

Thanks Frank
the noise is like a waterfall not just a slight hissing.
when I did the compressors the refrigerant was weighed out and weighed back in to the correct amount.
rather than a hard re-set I just meant a reboot of the system, I know some manufacturers recommend powering back up in a specific order I.e. outdoor then bs boxes then indoors?
is there anyway of when I’m working on this I can block the controllers as people kept changing stuff while I was working, it on a ITM & I’m using a service tool