Sime Format System 25 HE Installation And Servicing Instructions page 5

1.4 FUNCTIONAL DIAGRAM
4
5
26
1
8
9
16
17
27
G
KEY
1 Fan
2 Air-gas mixer
3 Main exchanger
4 Gas flow rate adjuster (shutter)
5 Gas valve
8 Water flow switch
9 Thermometer sensor
10 SM sensor (thermister)
11 Aqua Guard Filter System
12 Safety stat 100°
13 Auto air vent
14 Circulating pump
22
29
3
2
12
11
10
13
14
15
18
28
M
R
15 Automatic by-pass
16 Temperature/pressure gauge
17 Boiler drain
18 Safety valve
19 Expansion vessel
20 Condensation water trap
21 Upper automatic air vent
22 Limit stat 90°
26 Gas cock
27 C.H. flow cock
28 C.H. return cock
29 Smoke stat 95°
21
19
20
S3
Fig. 2
3