HYDRAULIC CIRCUIT
LEGEND
A
GAS
B
HOT WATER OUTLET
COLD WATER INLET
C
D
SYSTEM SUPPLY
E
RETURN
1
Hot water circuit drain cock
Hot water detector
2
3
Gas valve
4
Instantaneous water-heater
5
Air purge manual valve
Hot water pressure switch
6
7
3-way valve
8
Lack of water pressure switch
9
Burner
10 Fumes exchanger
11 Fumes pressure switch
12 Fumes fan
13 Total safety thermostat
14 Air purge manual valve
15 Expansion tank
16 Heating detector
17 Air purge automatic valve
18 Circulating pump
19 Heating circuit drain cock
20 Heating safety valve
21 Hydrometer
22 Filling cock
23 By-pass
57