mitsi city multi r407c

[mr slim]

Hi guys just wondered if anyone had come across this problem before.
The job has had a history of gas leaks the last which i fixed inside the bc box.
The system was tripple vacced and re charged to mitsis specified wieght and additional pipework charge carried out by mitsi technician in commissioning.
2 weeks later i am called to site.I find the suction pipe iced up from the bc box back to the condenser,When i put all 6 units in heating all units perform well in heating and vice versa in cooling.When i ran for instance 3 units in cooling and 3 in heating it took a while for any to perform.So i turned them all on one by one running them in simultaneous heat/cool until performance dropped but it didnt and the rooms the client wanted cold were cold and the rooms they wanted hot were hot. I have to go to site this week just wondered if anyone has had this problem?

[mr slim]

The model is a pury250ymfc.
I was using the m net tool.Its showing valve a and c open for ther units cooling and valve b open for the units heating. I know you cant go off the gas pressure but when the system is running perfect im averaging coil temps of 6 degrees in cooling and 40 degrees in heating with 4.5 bar suction 17 bar high side.
When in simultaneous the high side was low at 9 bar with low side at 1.5 bar

[frank]

By the way it is one of the complicated stuff to replace 4 way valve of VRV.

[frank]

Just confused why a simple RV swop should be difficult?

[mr slim]

i hope that isnt the case then.There are approx 8 condensers in the compound all of which have been positioned and fixed side by side with 2ft access at the front and well shall we say no physical access at the back. The four way valve is sited mid left isnt it. Now that would be a problem wouldnt it.

[frank]

I'm even more confused now

Why do you have to keep less than 120C? - how can you braze below this temperature?

i hope that isnt the case then.There are approx 8 condensers in the compound all of which have been positioned and fixed side by side with 2ft access at the front and well shall we say no physical access at the back. The four way valve is sited mid left isnt it. Now that would be a problem wouldnt it.

This wasn't pointed out previously

[jteixiera]

i think ure bluffing