Thank you John and Moverz for your promptly response...
I agree with the vendors with respect there must be no residual (from erection) efforts on turbine nozzle, but if I sized my spring considering that the nozzle is free in Y axis, the spring will take all dead weight in cold position and when I run with the nozzle connected,dividing dead weight between the spring and the nozzle, actually I will have a reaction against the nozzle higher than it really is, because I would have selected a bigger spring considering nozzle disconnected. What should I do, design for operation or installation?

PS : My nozzle is at the bottom of the turbine and movement is 3,5mm down.