Hi DP,
Quite possibly it does have contacts, but it doesn't have a microswitch that sends power to the boiler & pump.
The call for heat from the roomstat goes to the relay in the control box (not the mid pos valve)
The relay then sends power to boiler/pump and mid pos valve
Quite possibly it does have contacts, but it doesn't have a microswitch that sends power to the boiler & pump.
The call for heat from the roomstat goes to the relay in the control box (not the mid pos valve)
The relay then sends power to boiler/pump and mid pos valve
