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33 Pump vent plug
34 Gas valve
35 Gas valve inlet test point
36 D.h.w. inlet temperature probe NTC
37 D.h.w. outlet temperature probe NTC
38 Control box containing:
External temperature probe terminal
block, remote terminal block, d.h.w tank
terminal block, power supply terminal
block, external controls terminal block
39 Primary circuit pressure switch
40 Condensate trap
41 D.h.w. heat exchanger
42 Three-way diverter valve
43 Three-way electric actuator valve
44 Fan
45 Air box (air/gas mixer)
46 Ignition electrode
47 Burner
48 Domestic hot water flow switch
49 C.h. expansion tank
50 Domestic water circuit filter
51 Domestic hot water flow limiter
52 Flue outlet pipe
53 Air intake pipe
54 Flue exhaust sampling point
55 Air sampling point
56 By-pass valve
TECHNICAL INFORMATION
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