Engineering Data Book
4.HYDRO UNIT
3-way mixing valve connection Required Actuator Specification Electrical Specification: 230 V; 50 Hz; <100 mA The 3-way mixing valve is used to achieve the temperature differential needed in a 2-zone heating system. • Connect the 3-way mixing valve to terminals 2, 3 and 4 on Terminal Block 04 (for Type 1 mixing valve) or on terminals 1, 2 and 3 on Terminal Block 04 (for Type 2 mixing valve). • Connect the 3-way mixing valve in accordance with the diagrams below: Type 1: SPDT
Type 2: SPDT
port “A” to Zone 2 Heating
port “A” to Zone 2 Heating Hydro Unit TB 04
Hydro Unit
1 open
port “AB” to Hydro unit
port “A” close
TB 04
port “A” close
1
port “AB” to Hydro unit
2
open
3
2
4
3 4
port “B” BLANK OFF
port “B” BLANK OFF
Hot water cylinder connection (optional) Earth leakage breaker INPUT Power 230 V ~ 50 Hz
2 1
4 1
2
L
Hot water cylinder
Hot water cylinder electrical box connections
Hydro Unit
24
N
Terminal block 03