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Vaillant TURBOmax Pro 28-2 E Manual

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TABLE OF CONTENTS
Gas supply adjustments
(Commissioning Part II)
Servicing
Fault Finding Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
Logical fault finding procedure . . . . . . . . . . . . . . . . . .57
Fault finding charts . . . . . . . . . . . . . . . . . . . . . . . . . .58
Diagrams Functional flow diagram . . . . . . . . . . . . . . . . . . . . . . .66
Wiring diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
Short parts list Short parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68
Initial inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
Cleaning the burner and primary heat exchanger . . . . . .44
Parts replacement Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . .45
Initial preparation . . . . . . . . . . . . . . . . . . . . . . . . . . .45
Burner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
Electrodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
Gas valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
Temperature sensors (NTCs) . . . . . . . . . . . . . . . . . . . .49
Main heat exchanger . . . . . . . . . . . . . . . . . . . . . . . . .49
Expansion vessel . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
Electronic control board . . . . . . . . . . . . . . . . . . . . . . .51
Main transformer . . . . . . . . . . . . . . . . . . . . . . . . . . .51
Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Air pressure switch . . . . . . . . . . . . . . . . . . . . . . . . . .52
System bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
Diverter valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
Pressure gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
Aqua sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
DHW heat exchanger . . . . . . . . . . . . . . . . . . . . . . . .55
Pressure relief valve . . . . . . . . . . . . . . . . . . . . . . . . . .55
Checking functions . . . . . . . . . . . . . . . . . . . . . . . . . .56
Functional checks
(Commissioning Part III)
Functional checks . . . . . . . . . . . . . . . . . . . . . . . . . . .38
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Adjusting pump speed . . . . . . . . . . . . . . . . . . . . . . . .41
Final system flush (hot) . . . . . . . . . . . . . . . . . . . .41
Handing over to the user . . . . . . . . . . . . . . . . . . . . . .42
Gas inlet working pressure . . . . . . . . . . . . . . . . . . . . .34
Main burner pressure . . . . . . . . . . . . . . . . . . . . . . . . .35
Adjusting the central heating output (range rating) . . . . .36
Burner pressure and gas rate . . . . . . . . . . . . . . . . . . .37
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