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ADI CD boiler - Technical Manual
54
17.7 Hydraulic installation
17.7.1 Data to be considered
Concept Value
Minimum water working pressure
1 bar
Maximum water working pressure
5 bar
Maximum flow temperature
90ºC
Minimum water pressure safety device
The boiler includes a water pressure switch that stops the boiler when the water pressure achieves a minimum value.
It stops at 0.8 + 0.1 bar, and reactivates at 1 + 0.2 bar.
It is important to consider the following instructions (see hydraulic diagrams):
-
Cut-off/closing valves in the flow and return pipes of each boiler.
-
Do not weld the boiler to the installation piping.
- Models ADI CD 70 to ADI CD 175: male threaded flow-return connections of 2”.
Higher models:
ADI CD 200 to ADI CD 450: 2 ½ “, flanged connections, PN6.
ADI CD 550 to ADI CD 950: 4”, flanged connections, PN10.
-
Closed expansion vessel, calculated and installed according to the regulations.
-
Overpressure safety valves and boiler draining in accordance with the current regulations.
-
A pressure switch whose function is to stop the boiler if the hydraulic pressure is lower than the minimum value.
-
An automatic air vent of big capacity, installed in the flow pipe or in the higher part of the flow circuit of the
installation.
-
A filter with a stainless steel mesh of 0.3 mm in the heating return of every boiler.
-
A water meter in the refilling of the primary circuit.
-
A drain pipe for the evacuation of condensate: it must be connected to the drainage of the boilers room and it is
important that the outlet is visible to verify if it condenses.
17.7.2 Overpressure safety valve
The boilers maximum operating pressure is 5 bar. This value must never be exceeded and precautions must be taken
to avoid this could happen, even accidentally.
It is important to install overpressure safety valves in each boiler, according to the current regulations and to the
equipments installed. Minimum dimensions of the safety valve:
ADI CD
70 85 105 120 175 200 250 325 375 450 550 650 750 850 950
INCHES
1” 1" 1" 1" 1"1/4 1"1/4 1"1/4 1"1/2
1"1/2
2" 2" 2" 2" 2” 2”
Содержание ADI CD 375
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