Toshiba HWS-802XWHM3-E Engineering Data page 24

4.HYDRO UNIT
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.
Type 1 2-wire spring return
Type 2 3-wire SPST
Type 3 3-wire SPDT
Type 1: SPRING RETURN
port "A" to Hot water
cylinder
port "AB" to
Hydro unit
port "B" to Room heating or
cooling
Type 3: SPDT
port "A" to Hot water
cylinder
port "AB" to
Hydro unit
port "B" to Room heating or
cooling
Pump
01
1 2 3
SW13-1
OFF
OFF
ON
Hydro Unit
TB 05
7
8
port "A" open
9
Hydro Unit
port "A"
TB 05
close
7
open
8
9
23
Terminal Block 05
4 5 6 7 8 9
Type 2: SPST
port "A" to Hot water
cylinder
port "AB" to
Hydro unit
port "B" to Room heating or
cooling
Engineering Data book
Hydro Unit
port "A"
TB 05
close
7
open
8
9