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INSTRUCTIONS PERTAINING TO THE INSTALLER
Key:
1
D.H.W. priority sensor
2
Water pressure switch
3
Three way valve
4
D.H.W. NTC sensor
5
Flow sensor with filter and water flow rate limiter
6
Three way valve motor
7
Gas valve
8
Expansion vessel
9
Ignition electrode
10
Central heating NTC sensor
11
Overheat safety thermostat
12
Flue-water exchanger
13
Flue hood
14
Flue thermostat
15
Flame detector electrode
16
Burner
17
Burner injectors
18
D.H.W. plate heat exchanger (automatic by-pass)
19
Pump and air separator
20
System filling cock
21
Boiler drain point
22
Manometer
23
Pressure relief valve
Figure 16
heating
domestic
gas
domestic
heating
inlet
water outlet
water inlet
return
0901_0805 / CG_1738
31. BOILER SCHEMATIC