I have been given a small HVAC job to redesign and there is one circuit that the customer has used in the past and claims to have had no difficulty with. I am an old electrician with some HVAC experience in a new position with a consulting engineering firm so any advice would be appreciated. A modulating damper actuator (Belimo AF-24SR US) is being supplied 24vac from the grounded secondary of a class 2 transformer (X1 only ). X2 is grounded and not taken to the actuator. The analogue input to the actuator is supplied by an internally powered 15vdc 0-10vdc analogue output from a Distech ECP-510 Controller. The ECP-510 is supplied from a floating Class2 transformer as per manufacturer therefore the analogue output common has no ground reference. I am worried about floating voltages at the actuator. This is my first thread so be gentle with an old fella.