HYDRAULIC CIRCUIT
LEGEND
A
GAS
B
HOT WATER OUTLET
C
COLD WATER INLET
SYSTEM SUPPLY
D
RETURN
E
Hot water detector
1
2
Gas valve
3
Instantaneous water-heater
4
Air purge manual valve
Hot water pressure switch
5
3-way valve
6
Burner
7
8
Fumes exchanger
9
Fumes pressure switch
10 Fumes fan
11 Total safety thermostat
12 Air purge manual valve
13 Expansion tank
14 Heating detector
15 Air purge automatic valve
16 Circulating pump
17 Filling cock
18 By-pass
19 Lack of water pressure switch
20 Heating safety valve
21 Hydrometer
22 Drain cock
60