31 Gas valve
32 Gas valve inlet test point
33 Control box containing:
External temperature probe terminal
block, remote terminal block, power
supply terminal block, external controls
terminal block
34 Primary circuit pressure switch
35 Condensate trap
36 Fan
37 Air box (air/gas mixer)
38 Ignition electrode
39 Burner
40 C.h. expansion tank
41 Flue outlet pipe
42 Air intake pipe
43 Flue exhaust sampling point
44 Air sampling point
45 By-pass valve
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TECHNICAL INFORMATION