Toshiba HWS-802XWHM3-E Engineering Data page 90

7. HYDRO UNIT INSTALLATION MANUAL
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:-
▼ Fig. 7-28
Type 1: SPDT
port "A" to Zone 2 Heating
port "AB" to
Hydro unit
port "B" BLANK OFF
Hot water cylinder connection (optional)
• Please refer to "Electrical supply/cable specifications" for fuse/cable size and for connection details.
Electrical Connection (Hot Water Cylinder Electric Heater)
• The electric heater, incorporated in the hot water cylinder, requires a separate supply to Hydro Unit.
• Connect the hot water cylinder heater electrical supply in accordance with shown below:
Live conductor: Terminal L on Terminal Block 03
Neutral conductor: Terminal N on Terminal Block 03
Earth Conductor: Earth terminal on Terminal Block 03
• Connect the hot water cylinder heater to the Hydro Unit as shown below:
Live conductor to hot water cylinder: Terminal 1 on Terminal Block 03
Neutral conductor to hot water cylinder: Terminal 2 on Terminal Block 03
Earth conductor to hot water cylinder: Earth terminal on Terminal Block 03
Electrical Connection (Hot Water Cylinder temperature Sensor)
• Connect the hot water cylinder temperature sensor as shown below to terminals A & B on Terminal Block 06 in
the Hydro Unit.
• Please ensure that the interconnecting cable, between the Hydro Unit and the hot water cylinder, is connected
to earth at both ends of the cable using the shield wire.
▼ Fig. 7-30
Hot water cylinder
Hydro Unit
TB 04
1
open
2
3
4
port "A"
close
2
1
1 2 L
– 88 –
▼ Fig. 7-29
Type 2: SPST
port "A" to Zone 2 Heating
port "AB" to
Hydro unit
port "B" BLANK OFF
Earth leakage breaker
INPUT Power 230 V ~ 50 Hz
Terminal block 03
N
Engineering Data Book
Hydro Unit
TB 04
port "A"
close
1
open
2
3
4
7
26-EN