daikin ftxs60 going in to vacumm

[zeppy]

hi does anyone know why a daikin ftxs60 would go into a vacumm , i changed a suction line valve then presure tested to 42bar for 1 1/2 hours which presuse held then vacumm system out 1 1/2 hours re gased system with correct amount started to run system it ran ok for 15 mins then decided to pull down into a vacumm , does anyone know what the cause of this and how to resolve it to get system running normal
thanks zeppy

[rknsv123]

Dear friend
if that suction line valve is locked
if that valve copper tube brazing is dummy or closed
indoar unit fan motor is not started
Evaporator fins are clogged or blower also clogged

[The Viking]

Where are you taking the pressure reading from? Inside the unit or on the larger service valve?

Somewhere in the refrigerant flow you have a restriction, normally these can be found by following the flow and checking for temperature drops.
It might be that the EEV isn't working as it should, it might be that the smaller service valve not is fully opened, it might be that a strainer is blocked or it might be a kink in a pipe somewhere...

Does this unit have a service port on the smaller valve on the outdoor unit? If so, how does the pressure there compare with the pressure you are getting on the larger valve?