3 way valve Hydronic heating coil N.O ?

[fyp]

which side is the N.O side of 3 way valve for heating coil? at the inlet or outlet.
and which side is N.O for cooling coil?

any input,will thanks

[Magoo]

The bottom port of 3 port is the bypass

[MikeHolm]

which brand. they are not all the same

[fyp]

its a danfoss

[MikeHolm]

If it is an Danfoss ESBE, then it doesn't matter as long as the input is the middle one. If it is a thermostatic then the inputs are H on left, C at bottom and mix on the right. I use them all the time.