ADI LT boiler – Technical manual
Page
36
15.7 HYDRAULIC INSTALLATION
15.7.1 Data to be considered
Concept
Value
Minimum water working pressure
1 bar
Maximum water working pressure
5 bar
Maximum flow temperature
90ºC
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 LT 105 to ADI LT 200: male threaded flow-return connections of 2”.
- Higher models: flanged connections, PN 6.
-
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 air venting, or automatic purger 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 draining pipe for the evacuation of condensed products: 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.
15.7.2 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 LT
105
130
150
200
250
275
325
400
475
550
650
750
INCHES
1"
1"
1"
1"1/4
1"1/4
1"1/4
1"1/2
1"1/2
2"
2"
2"
2"
