Mitsubishi Electric PAC-IF051B-E Installation Manual page 10

3. System
3.5 Local system
1-zone temperature control
2-zone temperature control
3
4
7 10
2
9
1-zone temperature control with boiler
13
14
15
3
5
4
2
6
1. Zone1 heat emitters (e.g. radiator, fan coil unit) (field supply)
2. Mixing tank (field supply)
3. Zone1 flow water temp. thermistor (THW6) (option)
4. Zone1 return water temp. thermistor (THW7) (option)
5. Zone1 water circulation pump (field supply)
6. Zone1 flow switch (field supply)
7. Motorized mixing valve (field supply)
8. Zone2 flow water temp. thermistor (THW8) (option)
Note: Cooling mode cannot run under 2-zone temperature control but can run both in Zone1 and Zone2 under 1-zone temperature control.
3. Piping diagram for 2-zone temperature control
The following component parts are required for piping for 2-zone control opera-
tion.
Arrange the following component parts.
Mixing tank (field supply)
•
Motorized mixing valve (field supply)
•
Water circulation pump (× 2) (field supply)
•
Flow switch (× 2) (field supply)
•
• Thermistor (× 4) *2 sets of (PAC-TH011-E) thersmistors are required.
Wire the component parts to the water circuit referring to the figure below.
For more details on wiring, refer to "4.7 Wiring for 2-zone temperature controls".
Note: Do not install the thermistors on the mixing tank. This could affect
correct monitoring of flow and return temperatures through each
zone.
Install the Zone2 flow temp. thermistor (THW8) near the mixing valve.
10
Zone1
1
Zone1
5
6
1
Zone2
8
12
11
Zone1
1
3
5
4
2
6
2-zone temperature control with boiler
13
14
15
7
2
9. Zone2 return water temp. thermistor (THW9) (option)
10. Zone2 water circulation pump (field supply)
11. Zone2 flow switch (field supply)
12. Zone2 heat emitters (e.g. underfloor heating) (field supply)
13. Boiler flow water temp. thermistor (THWB1) (option)
14. Boiler return water temp. thermistor (THWB2) (option)
15. Boiler
Motorized
mixing valve
Mixing tank
Thermistor (THW6): Zone1 flow temp.
Thermistor (THW7): Zone1 return temp.
Thermistor (THW8): Zone2 flow temp.
Thermistor (THW9): Zone2 return temp.
Zone1
1
Zone1
3
5
4
6
1
Zone2
10
8
9
12
11
Water circulation pump 2
(Zone1)
THW6
THW7
Flow switch 2 (Zone1)
Heat emitters (Zone1)
Water circulation pump 3
(Zone2)
THW8
THW9
Flow switch 3 (Zone2) Heat emitters (Zone2)