GCH15010
12
WATER CIRCUIT DIAGRAM
8
26
*1 Refer to the following section [Local system].
Note:
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unit,
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national regulations.
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corrosive reaction
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ensure clear water
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Note:
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Model name
EHPT20Q-VM2EA
Maximum
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Booster heater
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Mass of the unit when full
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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
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))
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)
,
nlet
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Outlet
DHW
18
1
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Locally su
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lie
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Water
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e
1
19
27
*
1
2
21
22
2
2
11
7
12
27
8
6
29*
*
9
3D
12
17
16
Local system*1
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rain
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rain
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rain
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