60
HYDRAULIC CIRCUIT
LEGEND
A
GAS
B
HOT WATER OUTLET
C
COLD WATER INLET
D
SYSTEM SUPPLY
E
RETURN
1
Hot water detector
2
Gas valve
3
Instantaneous water-heater
4
Air purge manual valve
5
Hot water pressure switch
6
3-way valve
7
Burner
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