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8. DHWT electric connection chart
The VCZMH600E is an example of the three-way valve for the DHWT and central heating systems separated. The
valve should come together with the VC6012ZZ00 servo and the 45900445-013B wire. Switching of the valve requires
230V mains connnection to be applied to brown or black wire. The blue wire should be connected to the mains neutral
connector. By supplying voltage to the brown wire of the A/B the A way will be open. The voltage connecton to black
wire will open A/B to B way. The A/B, A and B indicates appropriate ends of the valve.
Pic.7 An example of three-way valve and temperature sensor connections to ZIO 21 board.
If the A/B valve connector is connected to the boiler supply outlet then “A” will supply central heating system and the
“B” DHWT system.
DS 1820 DHW temperature sensor should be to “Tzas” connector (white wire to “+” and yellow to “-“). If the DHW tank
has the thermostat then connect it's wires to WZ connector (voltage free).
Pic.7 An example of three-way valve connection and DHWT temperature sensor or thermostat
DS 1820
Termostat
00867
Thermostat
white
yellow
black
brown
blue
