noisy working

[cakabo28]

hı everybody
outdoor unit is working too noisy,
there is hıgh vibration on 4 way valve pipes,especially on suction pipe,ıt ıs causing vibration on outdoor unıt body what can ı do?
please share your experiences with me.

[Brian_UK]

What make/model unit is it ?

[cakabo28]

24 btu ac and working hitachi comp.

[Electrocoolman]

Have you checked the fan. I've had out of balance fan blades caused by a build up of dirt.
Remove fan blade and check the back of the center hub area for accumulated dirt.

[cakabo28]

thanks,
but fan is normal

[A_Ahed]

Check 4 lock pads .
Or compressor vibrating eliminators....might be demolished.

[nh3simman]

there is hıgh vibration on 4 way valve pipes,especially on suction pipe,

This seems like a faulty 4 way valve.

Clearly not the fan because you would not have identified the 4 way valve. I assume that the compressor is not vibrating.

What is the frequecy of the vibration (fast or about 1 second)?

[nh3simman]

I have just seen that Patrick Kotza in his book "REFREPAIR MANUAL", describes a situation that seems to be what you have.

If the slide on the 4-way valve sticks in some intermediate position, all 4 ports will be connected. This effectively short circuits the HP/LP, creating an unstable situation.

The vibration is the slide valve.

[cakabo28]

I think ıt is concerned with pipe design,I have used 5/8" pipe and I will try 1/2" now.
ı will come back with concluisons