economizer system

mo_eng said:

when outdoor air tempreture becomes 24 c or lower the economi9zer system shall be actived. in the case , the fresh , return and exhast air damper shall be proportionaly controled by mixed air tempreture sensor(pt1000)to achive mixed air tempreture sensor wich is 17 c.
at first how can i defined %qw0(analog output to motorize damper)?
i think %QW0:= A (%MW0)^2 + B IN THIS CASE MW0=IW0 AND IW0 IS ANALOG INPUT FROM PT1000
IF THAT RIGHT HOW CAN I DETERMINE A AND B (CONSTANT VALUES)?

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Lancie1 said:

MO,

First, what is the definition of QWO, MWO, and IWO. I assume these are symbols for Fresh, Return, and Exhaust air, but which is which?

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