Hi all, recently i have got my existing AHU replaced from 60RT to 80RT. From the replacement, the motor kW, chilled water supply demand, etc... have indirectly increased too. However i am having my doubt on the AHU performance, whether my supplier has oversize the 80RT AHU.

By comparing the measured pressure drop with the PD inside the catalog, how much deviation in the reading should i get to determine whether the AHU is oversize or undersize, and please enlighten me should there be other ways which i can determine whether my AHU is oversize. Btw, my AHU is being tagged onto a VSD.

Would appreciate for any kind input.

Thank You.