Honeywell SDC Service Manual page 67

SDC / DHC Operation
Copying heating circuits
NOTE Heating circuits cannot be copied to hot-water circuits since they
have different cycle temperatures: If a heating circuit is selected
as the source circuit, the hot-water circuit can no longer be called
up as the target circuit. The hot-water circuit as the source circuit
is also the target circuit. In this case, only programs of the hot-
water circuit are copied among one another if they were enabled
in the "System Parameter" menu.
EN2H-0221GE51 R0812 67