THE FOLLOWING ARE NOTPROVIDED WITH THE ITEM: AUTOMATIC BLOW VALVE, SAFETY VALVE, ELECTRONIC PRESSURE SENSOR, or EXPANSION
TANK.
•Specifications of the pump to be installed: Electronic pump with a head of at least 6 metres.
•Specifications of the Expansion tank to be installed according to the system:
For a correct sizing of the tank, the following operating parameters of the system are required:
C Volume of water in the system including boiler, pipes and heating elements with an overestimate of 15-20%. In principle, this is between 10 and 20 l for
every 1000 kcal/h (1.163 kW) of boiler heat output.
eCoefficient of expansion of water, corresponding to the maximum difference between the boiler thermostat calibration temperature and the water
temperature when the system is switched off. Examples of calculation displayed in the following table.
Coefficient eof expansion of water
TEMPERATURE
DIFFERENCE
COEFFICIENT e
0
0.00013
10
0.00027
20
0.00177
30
0.00435
40
0.01210
50
0.01450
55
0.01710
60
0.01980
65
0.02270
70
0.02580
75
0.02900
80
0.03240
85
0.03590
90
0.03960
100
0.04340
110
0.05150
•Safety hydraulic circuit according to EN 1487:2014 or equivalent in force (STORAGE HEATER INSTALLATION MODE ONLY):
Safety units are devices used in sanitary installations for the protection of storage water heaters. They consist of a numberof different components which perform
the following functions: - safety, to prevent the pressure of the fluid contained in the storage heater from reaching dangerous limits - anti-pollution, to prevent the
return of hot water to the cold water supply - shut-off, to isolate the supply and allow maintenance and control of the boiler circuit. They consist mainly of:
•SHUT-OFF COCK
•NON-RETURN VALVE
•NON-RETURN VALVE CONTROL DEVICE
•SAFETY VALVE
•MANUAL DRAIN KNOB
•HYDRAULIC LOAD SHUT-OFF DEVICE
P
iaAbsolute preload pressure of expansion tank, the sum of the respective preloads of the
tank (determined by the system) and the atmospheric pressure:
Pia= Pir + Patm
Pfa Absolute pressure setting of the safety valve, obtained by adding the respective
pressure of the valve and the atmospheric pressure:
Pfa= Pfr+ Patm
Given these parameters, the formula is as follows:
V, in litres, is the result of the calculation. For optimal sizing, the next largest tank that is
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