Piping Diagram For 2-Zone Temperature Control - Mitsubishi Electric Ecodan EHST20 serie Para El Instalador

4
Installation

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 (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 <Figure 4.3.7.>.
For more details on wiring, refer to "5.3 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.
Mixing tank
Water circulation pump 2
(Zone1)
THW6
THW7
Flow switch 2 (Zone1)
Water circulation pump 3
Motorized
(Zone2)
mixing valve
THW8
THW9
Flow switch 3 (Zone2)
<Figure 4.3.7>
Thermistor (THW6):
Thermistor (THW7):
Thermistor (THW8):
Heat emitters (Zone1)
Thermistor (THW9):
Heat emitters (Zone2)
Zone1 flow temp.
Zone1 return temp.
Zone2 flow temp.
Zone2 return temp.
20