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Condensing temperature Ecostruxure HVAC
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There are a couple of FB which can be used to convert pressure to condensing temperature but results are different, i would like to know why.
This is what Press2Temp gives as a result:
I´ve left the default (0) value for usiRefState, according to the manual, 50% liquid, 50% gas.
On the other hand, I am using the FloatingHighPressureCntrl and in that case, there´s a built in conversion on this block as well, giving iCondTemp as a result. There´s no usiRefState input here. Condensing temperature output is quite different, almost six degrees at this particular pressure. Both mention "relative" input pressure as an input to the block, so there does not seem to be a difference arising from "relative" vs "absolute" pressure.
I´ve also tried changing the iOutAirTemp in case it would explain this difference but result does not change.
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Hi,
FloatingHighPresCntrl makes a conversion using an internal Press2Temp with usiRefState=2 (Liquid):
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