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3.2.3.
Hydraulic connections
3.2.3.1. Thermal hot water system with closed expansion vessel
Furnace output ≤ 300.000 kcal/h – pressure 6 bar (fig. 4)
The generator must be equipped with:
a - Safety valve
b - Expansion vessel (connected with a ≥ 18 mm
diam. duct)
c - Regulation thermostats
d - Safety thermostat
e - Locking pressure switch
f - Regulation thermometer holder
g - Manometer with flange for control manometer
h - Thermal discharge valve or fuel valve
N1 - Flow
N2 - Return
N3 - Connection for additional equipment
N4 - Lower connections:
n4b - Expansion vessel connection
N4c - Loading / unloading
N6 - Bulb holder (thermometer, regulation
thermostat, safety thermostat, pump consent
thermostat).
3.2.3.2. Thermal hot water system with closed expansion vessel
Furnace output > 300.000 kcal/h – pressure 6 bar (fig. 5)
The generator must be equipped with:
a – 1 safety valve
2 safety valves if P > 500.000 kcal/h
b - Expansion vessel
c – Regulation thermostats
d – 1st safety thermostat
f – Locking pressure switch
g – Regulation thermometer holder
h – Manometer with flange for control manometer
i – Thermal discharge valve or fuel valve
N1 – Flow
N2 – Return
N3 – Connection for additional equipment
N4 – Lower connections:
n4b – Expansion vessel connection
N4c – Loading / unloading
N5 – Safety valves connection
N6 – Bulb holder (thermometer, regulation thermostat,
safety thermostat, pump consent thermostat).
• Ensure that the hydraulic pressure measured after the reduction valve on the flow duct is not higher than the operating pressure
indicated on the plate of the component (boiler, external water heater, etc.).
• Since the water pressure in the heating system increases during operation, ensure that the maximum value does not exceed the
maximum hydraulic pressure shown on the component's plate (6 bar).
• Check that the boiler and water heater safety valve discharges are connected to a discharge hopper so as to avoid that the valves,
as a result of a malfunction, flood the area during operation.
• Check that the hydraulic and heating system piping is no used for earthing the electrical system. Should this be the case, in a short
time serious damage may be caused to the piping, boiler, water heater and radiator.
• Once the heating system is filled with water, it is advisable to close the supply tap and keep it in this position. Any leakages from
the system will, therefore, be noticed by a drop in the hydraulic pressure shown on the manometer.
14
d
c
N2
N3
N6
h
d
c
N2
N3
N1
g
h
a
f
N4
N4b
f
N1
i
a
g
N5
N6
N4
N4b
e
b
N4c
fig. 4
b
N4c
fig. 5
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