GOC665945 - Contractor - EWA-Installing VFD on Supply and Return Fan

Statement of Work/Overview:
As part of energy savings measure for the building, the building air handling unit located in the mechanical penthouse supply and return fans and motors will change from constant speed, variable vane to inverter ready motors complete with VFDs and the fans will have their vane positions fixed.
 
In addition, motorized dampers will be installed for the supply air mains serving the main and basement floors. There are existing motorized dampers for the remainder of the supply air main floors. Installing the new motorized dampers will allow for better floor isolation with occupancy schedules of the different tenants on each floor and therefore allowing the fan speeds to lower further.
 
Additional control sensors and programming is required for new fan speed controls and tenant occupancy scheduling.
 
Prior to any demolition work, an air survey is required at the fans and at the floor supply air mains to ensure the building air flows are maintained with the new operation, and to confirm the current control sequence and locations of existing differential pressure sensors. Contractor is also required to ensure there are no variable inlet vanes to the fans. If found, the inlet vanes and associated power and controls are to be demolished.