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