4.HYDRO UNIT
Engineering Data book
23
Electrical connection for external additional pumps
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.
SW13-1
Type 1 2-wire spring return OFF
Type 2 3-wire SPST OFF
Type 3 3-wire SPDT ON
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01
Terminal Block 05
Pump
7
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9
7
8
9
7
8
9
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
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