Local System - Mitsubishi Electric EHST20C-VM2C.UK Service Manual

Local system

1-zone temperature control
2-zone temperature control
7
2
2-zone temperature control with boiler
13
14
15
7
2
1. Zone1 heat emitters (e.g. radiator, fan coil unit) (local supply)
2. Mixing tank (local supply)
3. Zone1 flow water temp. thermistor (THW6)
4. Zone1 return water temp. thermistor (THW7)
5. Zone1 water circulation pump (local supply)
6. Zone1 flow switch (local supply) *
7. Motorized mixing valve (local supply)
8. Zone2 flow water temp. thermistor (THW8)
9. Zone2 return water temp. thermistor (THW9)
* Flow switch specifications: DC12 V / 1 mA / Both normally-open and normally-closed types can be used. (Set DIP switch 3 to select the logics. Refer to "6-7. DIP
switch setting".)
OCH570
Zone1
Zone1
3
5
4
6
1
Zone2
8
10
9
12
11
Zone1
3
5
4
6 1
Zone2
8
10
9
12
11
Optional part : PAC-TH011-E
Optional part : PAC-TH011-E
3
4
1
2
1-zone temperature control with boiler
13
14
2
1-zone temperature control (2-zone valve ON/OFF control)
18
10. Zone2 water circulation pump (local supply)
11. Zone2 flow switch (local supply) *
12. Zone2 heat emitters (e.g. underfloor heating) (local supply)
13. Boiler flow water temp. thermistor (THWB1)
14. Boiler return water temp. thermistor (THWB2)
15. Boiler (local supply)
16. Zone1 2-way valve (local supply)
17. Zone2 2-way valve (local supply)
18. Bypass valve (local supply)
23
Zone1
5
6
15
Zone1
3
5
4
6
Zone1
16
Zone2
17
Optional part : PAC-TH011HT-E
1
1
1
12