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WaterMaster 25 - 35 - 45 - 70 - 85 - 120 : A1006482 - 664Y7300 • D
APPLIANCE DESCRIPTION
MODELS - WATERMASTER® 25 - 35 - 45 - 70 - 85 - 120
The WaterMaster® series is a range of condensing water heaters designed for the exclusive production
of Domestic Hot Water. The water heaters combine ACV's "Tank-in-Tank" concept with a double primary
circuit to reach the high performance of a TOTAL CONDENSATION, double-circuit water heater.
All the WaterMaster® models are equipped with a high eciency charging pump and with an ACV air/
gas premix burner with low NOx emissions. During operation, the burner starts automatically as soon as
the water heater temperature gets lower than the preset temperature and stops as soon as the preset
temperature is reached.
The WaterMaster® series features a built-in frost protection mechanism: as soon as the ow temperature
[NTC1 probe] drops below 7°C, the primary pumps are activated. As soon as the ow temperature is at
5°C, the burner starts up until the ow temperature rises above 15°C. The pumps continue to run for
around 10 minutes. The function can be enabled or disabled through the installer menu. When the frost
protection is disabled, only the pumps operate.
WATERMASTER® 25 - 35 - 45 OVERVIEW
1
2
3
5
4
6
7
10
12
13
14
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16
17
19 21
22
20
18
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9
8
1. Concentric ue gas/air inlet box
2. Flue gas exhaust tube
3. Combustion chamber
4. Stainless steel heat exchanger
5. Stainless steel “Tank-in-Tank” hot water produc-
tion tank
6. Primary circuit separation disc
7. Indirect water pre-heater
8. Condensate recovery dish + NTC5 sensor (ue gas)
(not shown)
9. Insulation
10. High eciency circulator pump
11. NTC2 sensor (CH return)
12. Pressure sensor
13. Electrical panel (with spare fuses at the back)
14. ACVMax Control panel
15. DHW tank dry well (Dip tube with temperature sen-
sor)
16. Automatic air vent
17. Gas pipe
18. NTC1 sensor (CH supply)
19. Gas valve
20. DHW safety valve / (T & P relief valve - UK only)
21. Modulating air/gas premix burner with fan
22. Air inlet
15


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