– 23 –
Hydro Unit
Installation Manual
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:
▼
Fig. 7-25
▼
Fig. 7-26
▼
Fig. 7-27
SW13-1
Type 1
2-wire spring return
OFF
Type 2
3-wire SPST
OFF
Type 3
3-wire SPDT
ON
7
8
9
Type 1: SPRING RETURN
port “A” to Hot water
cylinder
port “AB” to
Hydro unit
port “B” to Room heating
or cooling
port “A” open
Hydro Unit
TB 05
7
8
9
Type 2: SPST
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
7
8
9
Type 3: SPDT
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
23-EN
Summary of Contents for HFC series
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