ATTACHED is a SAMPLE wiring diagram for wiring a DHW Indirect (notice the additional "RIB" relay as an add on, NOT supplied)with MFTHW boiler(s).
This addresses the ability of using a DHW sensor in the indirect tank while maintaining
DHW PRIORITY with zone panels! Remember to select DHW SENSOR in parameter 39:SA ! The default is AquA(aquastat) , so you will have to select Sens (sensor).
The wiring diagram shows cascaded MFTHW's BUT this can also be followed for a
Single boiler application as well .
If any questions speak with Kenny or Don.