pressure in the system

[tralex]

Hi experts,
I have deal with 2 multi-decks.
They have system with capillary tube. They work good.
I checked pressure in the system through Shrader valve on the compressor.
The evaporating pressure of each during work is 3,3 bar.
But when I stoped multi-decks for 48 hours and checked pressure in the system. It was different (6.0 bar and 6.4 bar). Why? The system has equal amount of refrigerant (R22) and multi-decks are staying near.
Which factors can influence on it?

Thanks for any advice.

[NoNickName]

Are you using the same gauges or are you reading the pressure with two different sets of gauges?

[Brian_UK]

A small heat source near one system perhaps?

[eggs]

A little bit of air in one of them ???

cheers

eggs

[tralex]

Thank you for answer.

I'm using the same gauges for reading the pressure.
May be sunlight is small heat source?
I know multi-decks was charged by Galileo TP fluid refrigerant charging machine.

[NoNickName]

Of course sun is a heat source, the only one around. :-)