1. I have 3 York YK centrifugal chiller and i wan it to be integrated to BMS (BACNet). Do I need to buy 3 E-Link gateways or just 1 and connect the Chiller Controls yorktalk RS-485 in series. The control panel is non-optiview.
2. Another option on this chiller is replacing the entire control panel with a third party DDC and an Human Machine Interface with local 15" display and operatable by BACNet.
The Chillers are 20 years old and in good running condition. I want it as modern as possible