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INSTRUCTIONS FOR FITTERS
35. FUNCTIONAL CIRCUIT DIAGRAM
240 i - 280 i
1
heating filter
2
pressure gauge
3
powered 3-way valve
4
gas valve
5
heating circuit pump with deaerator
6
boiler filling tap
7
gas train with injectors
8
flame detection electrode
9
fumes conveyor
10
fumes thermostat
11
water-fumes exchanger
12
flame ignition electrode
13
burner
14
safety thermostat
15
NTC heating probe
16
NTC domestic hot water sensor
17
sacrificial anode
18
storage boiler
19
heating circuit expansion vessel
20
DHW circuit pump
21
storage boiler drain tap
22
DHW circuit safety valve
23
DHW circuit expansion vessel (accessory)
24
boiler safety valve
25
boiler drain tap
26
hydraulic pressure switch
27
check valve on automatic by-pass
28
plate exchanger
Key:
Figure 21
DHW
outlet
DHW
inlet
heating delivery
heating return
gas inlet