–87–
7. HYDRO UNIT INSTALLATION MANUAL
Engineering Data Book
3-way valve (diverter) connection
Required Valve Specification:
Electrical Specification: 230 V; 50 Hz; <100 mA
Valve Diameters: Port A, Port B: Ø 1 1/4"
Return Mechanism: 3 types of 3-way valve (diverter) can be used.
Set the 3-way valve in use with the DIP switch SW13-1 on the Hydro Unit board.
NOTE
Continuous operation of the valve motor at the fully open position is not recommended.
• The 3-way diverter valve is used to select either domestic hot water or space heating.
• Connect the 3-way diverter valve to terminals 7, 8 and 9 on Terminal Block 05.
• Connect the 3-way diverter valve in accordance with the diagram below:-
SW13-1
Type 1 2-wire spring return OFF
Type 2 3-wire SPST OFF
Type 3 3-wire SPDT ON
7
8
9
▼ Fig. 7-25
7
8
9
▼ Fig. 7-26
7
8
9
▼ Fig. 7-27
Type 1: SPRING RETURN Type 2: SPST
Type 3: SPDT
port “A” to Hot water
cylinder
port “AB” to
Hydro unit
port “B” to Room heating
or cooling
port “A” open
port “A” to Hot water
cylinder
port “AB” to
Hydro unit
port “B” to Room heating
or cooling
port “A”
close
open
port “A” to Hot water
cylinder
port “AB” to
Hydro unit
port “B” to Room heating
or cooling
port “A”
close
open
Hydro Unit
TB 05
Hydro Unit
TB 05
Hydro Unit
TB 05
25-EN
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