Supplied By www.heating spares.co Tel. 0161 620 6677
24
7.4.1
MINIMUM SETTING
With the boiler operating at minimum output the
CO
2
reading should be 8.6% (+/- 0.2%). If the CO
2
reading is correct, proceed to 7.4.2. If the CO
2
reading is incorrect, the minimum gas pressure
must be adjusted as follows:
●
Remove the cover, then using a suitable
screwdriver, very slowly turn the minimum
adjustment screw (see fig. 34) – clockwise to
increase, counter clockwise to decrease – until
the correct value is displayed on the CO
2
analyser (allow time for the analyser to stabilise).
●
Using the procedure detailed in 7.3.5, change
the fan speed momentarily from minimum to
maximum, then back to minimum.
●
Check that the correct value is still being
obtained. If not, repeat the above procedure.
7.4.2
MAXIMUM SETTING
The maximum setting must only be checked and/
or adjusted after the correct minimum setting has
been verified. Using the procedure detailed in
7.3.5, change the fan speed from minimum to
maximum.
With the boiler operating at maximum output the
CO
2
reading should be 8.6% (+/- 0.2%). If the CO
2
reading is correct, press the RESET button to exit
the appliance engineer mode. If the CO
2
reading
is incorrect, the maximum gas pressure must be
adjusted as follows:
●
Using a suitable screwdriver, very slowly turn
the maximum adjustment screw (see fig. 34) –
clockwise to increase, counter clockwise to
decrease – until the correct value is displayed
on the CO
2
analyser (allow time for the analyser
to stabilise).
●
Using the procedure detailed in 7.3.5, change
the fan speed momentarily from maximum to
minimum, then back to maximum.
●
Check that the correct value is still being
obtained. If not, repeat the above procedure.
●
Press the RESET button to exit the appliance
engineer mode.
Remove the analyser test probe from the analysis
test point and refit cap. Refit the air chamber
cover. Refit appliance casing.
NOTE
You should ensure that all radiators or heat
emitters are fully open during the above
procedures. This will ensure that the fan speed
(output) of the boiler is not compromised due to a
high flow temperature.
7.5
LED 1 STATUS CODES
When the boiler is operating normally (without
fault), LED 1 displays the current status of the
boiler whilst LED 2 will normally display the
relevant outlet temperature.
In addition to the above operating status codes,
the boiler may also display intermittent anomaly
codes as featured below.
Status
Standby
Purge
Ignition
CH mode
DHW mode
Fan-speed low
Built-in delay
CH over-run
DHW over-run
High temperature
LED 1
0
1
2
3
4
5
6
7
8
9
LED 2
CH inlet temp.
Flow/return temp.
Flow/return temp.
Flow/return temp.
Return temperature
Flow/return temp.
Flow/return temp.
Flow/return temp.
DHW over-run
Return temperature
LED 1
E
E
E
E
E
E
LED 2
18
19
24
26
30
65
Reason for lockout
Flow sensor above 95
°
C
Return sensor above 95
°
C
Temperature differential exceeded
Return sensor 35
°
C higher than flow
sensor
Insufficient fan speed
Fig. 34
Maximum
screw
Minimum
screw