Local System; 1-Zone Temperature Control; 2-Zone Temperature Control; Piping Diagram For 2-Zone Temperature Control - Mitsubishi Electric PAC-IF061B-E Installation And Operation Manual

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) (local supply)
2. Mixing tank (local supply)
3. Zone1 flow water temp. thermistor (THW6) (option)
4. Zone1 return water temp. thermistor (THW7) (option)
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) (option)
9. Zone2 return water temp. thermistor (THW9) (option)
Note: Cooling mode cannot run under 2-zone temperature control but can run both in Zone1 and Zone2 under 1-zone temperature control.

3.6 Piping diagram for 2-zone temperature control

The following component parts are required for piping for 2-zone control operation.
Arrange the following component parts.
•
Mixing tank (local supply)
•
Motorized mixing valve (local supply)
•
Water circulation pump (× 2) (local supply)
•
Flow switch (× 2) (local 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: D o 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
1-zone temperature control (2-zone valve ON/OFF control)
18
2-zone temperature control with boiler
13
14
15
3
4
7
10
2
9
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) (option)
14. Boiler return water temp. thermistor (THWB2) (option)
15. Boiler (local supply)
16. Zone1 2-way valve (local supply)
17. Zone2 2-way valve (local supply)
18. Bypass valve (local supply)
THW6
THW7
Motorized Water circulation pump 3
mixing valve
(Zone2)
Mixing tank
THW9
Thermistor (THW6): Zone1 flow temp.
Thermistor (THW7): Zone1 return temp.
Thermistor (THW8): Zone2 flow temp.
Thermistor (THW9): Zone2 return temp.
Zone1
1
Zone1
16
1
Zone2
17
12
Zone1
5
6
1
Zone2
8
12
11
Water circulation pump 2
(Zone1)
Flow switch 2 (Zone1)
Heat emitters (Zone1)
THW8
Flow switch 3 (Zone2)
Heat emitters (Zone2)