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79
8. SYSTEM DESIGN GUIDE
WR2-Series-575V
c) Schematic system diagram including heat-source units, water circuits, power supplies, and signals
Figure c)-1 Schematic system diagram
Table c)-1 Water-circuit system
Table c)-2 Electrical wiring specification
: Power-supply wiring
: Water pipes
: Signal wiring
208/230 VAC
Symbol
Component
Specification
Connection example
Note
Command to adjust valve opening (Unit 1)
0 to10 VDC
Unit 1 (TB9-5, 6) -Water flow rate control valve 1
Analog output
Command to adjust valve opening (Unit 2)
0 to10 VDC
Unit 2 (TB9-5, 6) -Water flow rate control valve 2
Analog output
Pump operation ON signal (Unit 1)
208/230 VAC
Unit 1 (TB8-1, 2) - Control board
Digital output
Pump operation ON signal (Unit 2)
208/230 VAC
Unit 2 (TB8-1, 2) - Control board
Digital output
Pump interlock (Unit 1)
208/230 VAC
Flow switch - Unit 1 (TB8-3, 4)
Digital input
Pump interlock (Unit 2)
208/230 VAC
Flow switch - Unit 2 (TB8-3, 4)
Digital input
Power supply for water flow rate control valve (Unit 1)
24 VAC or 24 VDC
Control board - Water flor rate control valve 1
Power supply
Power supply for water flow rate control valve (Unit 2)
24 VAC or 24 VDC
Control board - Water flow rate control valve 2
Power supply
Symbol
Component
Usage
Note
(1)
(Motor-powered) water flow rate control valve For controlling water flow rate
To be procured on site ( See b)-2.)
(2)
Control valve
For keeping the circulating water flow rate within the operating range To be procured on site
(3)
Shut-off valve
For the maintenance of devices
To be procured on site
(4)
Flow switch
For detecting the lower limit of circulating water flow rate
To be procured on site
M
M
(3)
(2)
(2)
(3)
(1)
(3)
(1)
(3)
Heat-source
Heat-source
unit 1
5
6
1
2
TB9
3
4
1
2
TB8
Pump operation ON signal
Pump operation ON signal
Pump interlock
208/230 VAC
208/230 VAC
Valve opening signal
0-10 VDC
24 VAC or 24 VDC
unit 2
5
6
1
2
TB9
3
4
1
2
TB8
Pump interlock
208/230 VAC
Valve opening signal
(4)
(4)
I/O board
I/O board
0-10 VDC
24 VAC or 24 VDC
3
4
2
1
6
5
8
7
3
4
2
1
6
5
8
7
0000006382.BOOK 79 ページ 2021年7月19日 月曜日 午後4時14分