Thanks for your feedback guys,
it seems that the phases are split inside the unit to provide 3 single phase 'zones':control, which is 24vdc via auto ranging p.s.u
(switch mode)the range is 90v to 250v
The other two 'zones' feed two pumps 220-240vac 50-60Hz and 4xheaters 240vac.
Regards solaris.
We have an appliance that uses a 380/415v 3phase 4 wire supply for the U.K market(all components are 240v single phase)A customer based in the states has a 220v 3phase delta supply, short of changing the internal components, what else can i do to get this appliance to work?