Mitsubishi Electric ecodan EHPT20Q-VM2EA Installation Manual page 5

3
Technical Information
Water circuit diagram
*1 Refer to the following section [Local system].
Locally su lie
Water e
11
*
31*
31*
27
12
9
rain
rain
21
1
26
19
3
2
HEX
32*
6
32*
1. Plate heat exchanger 12. Manual air vent
2. Booster heater with thermostat 13. Drain valve (Primary circuit)
3. Drain cock (Primary circuit) 14. Strainer valve
4. Drain cock (Secondary (Potable) circuit) 15. Flow sensor 1 (For space heating)
5. Pump valve 16. Flow sensor A (Secondary (Potable) circuit)
6. Water circulation pump 1 17. Flow sensor B (Primary circuit)
(For thermal store and space heating) 18. Primary thermal store tank
7. Water circulation pump A 19. THW1 (Flow water temp. thermistor)
(For hot water supply to plate heat exchanger) 20. THW2 (Return water temp. thermistor)
8. 3-way valve 21. THW3 (Flow water temp. thermistor 2 (to tank))
9. Manometer 22. THW4 (DHW supply temp. thermistor)
10. Primary pressure relief valve 23. THW5A (Stored water temp. thermistor (upper))
11. Automatic air vent 24. THW5B (Stored water temp. thermistor (lower))
Note:
unit,
Model name EHPT20Q-VM2EA
Maximum
Booster heater
Mass of the unit when full
8
Outlet DHW
33*
*
22
17 16
29*
1
18
23
32*
3
27
2
32*
32*
12
7
8
rain
3
13
25. Electrical isolation pipe
26. Manual thermostat
27. Non-return valve
28. Filling loop (Accessory item)
29. Primary expansion vessel (Accessory item)
30. Discharge pipe (Local supply)
31. Tundish (Accessory item)
32. I solating valve (Local supply)
33. Thermo mix valve (recommended) (Local supply)
34. Magnetic filter (recommended) (Local supply)
35. Strainer (Local supply)
<Figure 3.2>
national regulations.
corrosive reaction
ensure clear water
Note:
3
Technical Information
Local system
1-zone temperature control
nlet
1. Heat emitters (e.g. radiator, fan coil unit) (local supply)
2. Zone1 2-way valve (local supply)
3. Zone2 2-way valve (local supply)
4. Auto-bypass valve (local supply)
Local system*1
Energy monitoring
End user can monitor accumulated*1 'Consumed electrical energy' and 'Delivered energy' in each operation mode*2 on the main controller.
*1 Monthly and Year to date
*2 - DHW operation
- Space heating
28*
Refer to "5.7 Main controller" for how to check the energy, and "5.1 DIP switch functions" for the details on DIP-SW setting.
Either one of the following two method is used for monitoring.
Note: The method 1 should be used as a guide. If greater accuracy is required, then method 2 should be used.
1. Calculation internally
Electricity consumption is calculated internally based on the energy consumption of outdoor unit, electric booster heater, pump1 and other auxiliaries.
Produced heat is calculated internally by multiplying delta T (Flow and Return temp.) and flow rate measured by the factory fitted sensors.
Set the electric booster heater capacity and water pump(s) input according to indoor unit model. (Refer to the menu tree in "5.7 Main controller")
Default
EHPT20Q-VM2EA
*1 "***" displayed in the energy monitor setting mode means the factory fitted pump is connected as pump 1 so that the input is automatically calculated.
When anti-freeze solution (propylene glycol) is used for primary water circuit, set the produced energy adjustment if necessary.
For further detail of above, refer to "5.7 Main controller".
Note: Consumed electric energy of pump A is automatically calculated by the system.
2. Actual measurement by external meter (locally supplied)
FTC has external input terminals for 2 'Electric energy meters' and a 'Heat meter'.
If two 'Electric energy meters' are connected, the 2 recorded values will be combined at the FTC and shown on the main controller.
(e.g. Meter 1 for main power line, Meter 2 for booster heater power line)
Refer to the [Signal inputs] section in "5.2 Connecting inputs/outputs" for more information on connectable electric energy meter and heat meter.
1-zone temperature control (2-zone valve ON/OFF control)
Zone1
4
1
Booster heater Pump1*1
2kW ***(factory fitted pump)
2kW ***
<Table 3.5>
Zone1
2
1
Zone2
3
1
9