Panasonic ac

[G Cook]

Hi all, never really done much with ac but was asked to have a quick look at this for a customer. There are 2 units side by side so was able to compare.

Panasonic single split, R22. Model CU-80C52HP.
Unit was being used in heating mode, but not producing much heat.

I think the 4way valve must be allowing discharge vapour to enter into suction line. The pipe leaving the evaporator (outdoor) was frosty up to valve, then from the valve the pipe was hot right through the accumulator back to the compressor. There was also a loud hiss coming from the valve.

Liquid line pressure = 5 bar
Suction pressure = 3.5 bar
Ambient temp was around minus 3c.

What do you guys think?

[sedgy]

mr cook,
you could try running the unit on cooling, < dose it run on cooling?<
they do say a tap on the headclears ones thinking try the same on the 4way valve= on heating, best of luck,
sedgy

[G Cook]

Thanks sedgy, should be back that way today so will give it a try on cooling. Anyone with any other ideas?