35
Concord Super Series 4 -
Installation & Servicing
YES
Does boiler
sequence start in
1 minute?
Fit a new Board
No. 30
Does boiler
sequence start in
1 minute?
Fit a new Board
No. 28. Does
ignition start?
Fit a new Board
No. 28
Is gas pressure
set at 6.8 mbar?
Can gas / air
control be
adjusted?
Fit a new gas
valve - gas / air
control unit
Is there a spark at
the burner?
Is spark gap
correctly set at
4 - 5 mm?
Fit a new ignition
probe
Fit a new Board
No. 29
Is differential air
pressure above
1.1 mbar?
Are 6 mm sensing
tubes clear?
Check and as necessary
clean/replace: air filters,
fan impellor, heat
exchanger flues & burner
Set burner gas
pressure to 6.8
mbar
Does the burner
light?
Are the gas cocks
open?
Do the gas valves
open?
Is there mains
voltage to the gas
valve?
Fit a new gas
valve - gas / air
control unit
Does the burner
remain alight?
When firing, is the
minimum inlet gas pres-
sure > 15mb measured at
the gas header point?
Is the detection
lead and probe
OK?
Fit a new Board No.
29. Does burner
remain alight?
Fit a new Board
No. 28. Is there a
mains supply?
Fit a new Board
No. 29. Is there a
mains supply?
Is the burner ‘on’
light illuminated?
Fit a new Board
No. 28
Fit a new Board
No. 28
NO
YES
YES
YES
YES
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
YES
YES
NO
YES
NO
NO
NO
YES
NO
YES
YES
SERVICING AND FAULT FINDING
Содержание Concord Super Series 4 50 V
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