Water System Diagram - Mitsubishi Electric EHPT20Q-VM2EA Service Manual

8
WATER CIRCUIT DIAGRAM
*1 Refer to the following section [Local system].
Locally su lie
Water e
*
rain
rain
HEX
1. Plate heat exchanger
2. Booster heater with thermostat
3. Drain cock (Primary circuit)
4. Drain cock (Secondary (Potable) circuit)
5. Pump valve
6. Water circulation pump 1
(For thermal store and space heating)
7. Water circulation pump A
(For hot water supply to plate heat exchanger)
8. 3-way valve
9. Manometer
10. Primary pressure relief valve
11. Automatic air vent
Note:
Model name
Maximum
Booster heater
Mass of the unit when full
GCH15010
11
27
12
9
21
1
26
19
2
6
12. Manual air vent
13. Drain valve (Primary circuit)
14. Strainer valve
15. Flow sensor 1 (For space heating)
16. Flow sensor A (Secondary (Potable) circuit)
17. Flow sensor B (Primary circuit)
18. Primary thermal store tank
19. THW1 (Flow water temp. thermistor)
20. THW2 (Return water temp. thermistor)
21. THW3 (Flow water temp. thermistor 2 (to tank))
22. THW4 (DHW supply temp. thermistor)
23. THW5A (Stored water temp. thermistor (upper))
24. THW5B (Stored water temp. thermistor (lower))
unit,
EHPT20Q-VM2EA
22
17
1
18
2
27
2
12
7
8
1
national regulations.
ensure clear water
Note:
12
Outlet DHW
*
16
29*
Local system*1
rain
28*
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. Isolating valve (Local supply)
33. Thermo mix valve (recommended) (Local supply)
34. Magnetic filter (recommended) (Local supply)
35. Strainer (Local supply)
corrosive reaction
nlet