33
xtra
-
Installation & Servicing
SERVICING
F80 & F120 models
44 GAS VALVE ADJUSTMENT
Maximum rate adjustment
1.
Switch the boiler on and operate for 10 minutes.
2.
To ensure the boiler operates at maximum rate without
modulating set the fan speed to maximum.
3.
To set the fan speed to maximum. Press and hold in the 'mode'
and '+' buttons simultaneously. The display will show
as the first digit indicating the boiler is
operating at maximum rate.
4.
Using the maximum rate adjustment screw, adjust the valve
until the CO
2
value measures 9.7% ± 0.2 (nb clockwise reduces
CO
2
).
Minimum rate adjustment
5.
To ensure the boiler operates at minimum rate without
modulating, set the fan speed to minimum
6.
To set the fan speed to minimum. Press and hold in the 'mode'
and '-' buttons simultaneously. The display will show
as the first digit indicating the boiler is
operating at minimum rate.
7.
Remove the protective cap and then using the offset adjustment
screw, adjust the valve until the CO
2
value measures 9.5% ± 0.2
(nb anticlockwise reduces the CO
2
level). The offset adjustment
is a lot more sensitive than the throttle adjustment
8.
Re-check the CO
2
level at maximum rate and repeat steps 3 to 7
if necessary.
9.
Press the '+' and '-' buttons simultaneously to return to normal
operating mode.
10.
Seal adjustment screw with tamper proof paint.
Note.
It is possible to switch off the CH/DHW systems if the mode and +/-
buttons are not held simultaneously. Refer to Frame 23 under the
heading CH/DHW Systems for guidance.
H
L
43 SERVICING SCHEDULE
To ensure the continued safe and efficient operation of the
appliance it is recommended that it is checked at regular
intervals and serviced as necessary. The frequency of
servicing will depend upon the installation condition and
usage but should be carried out at least annually.
Ideal Stelrad Group
does not accept any liability resulting from
the use of unauthorised parts or the repair and servicing of
appliances not carried out in accordance with the Company's
recommendations and specifications.
Note
.
Some aluminium oxide build-up within the heat exchanger
assembly is quite usual with this type of condensing boiler.
Though removal and cleaning is recommended annually, the
heat exchanger, sump and condensate trap must be inspected
and cleaned after a maximum of 2 years operation.
1.
Light the boiler and carry out function checks, noting any
operational faults.
2.
Run the boiler for 10 minutes and then check the gas
consumption rate. Refer to Frame 44 for reference on how
to force the burner to maximum and minimum rates.
3.
For correct boiler operation the CO/CO
2
ratio of the flue gas
should not be greater than 0.004 ratio. If this is the case
and the gas input is at least 90% of the nominal, once
compliance with the note above is ensured, then no further
action need be taken. If not proceed to 4. Refer to Frames
45 to 51 for guidance.
4.
Refer to Frame 42.
5.
Remove and inspect the fan/venturi assembly. Refer to
Frame 46.
6.
Remove the burner manifold and inspect the electrodes and
sightglass. Refer to Frames 47 and 54.
7.
Remove and clean the burner. Refer to Frame 48.
8.
Inspect the heat exchanger through the burner opening.
Optionally remove the inspection covers on the left hand side
of the heat exchanger. If there are signs of aluminium oxide
build up, spray water down the flueways taking care not to
get water on the gas valve and controls. Refer to Frame 49.
9.
Remove the sump cover and scrape out any deposits. Refer
to Frame 50.
10.
Clean the condensate trap. Refer to Frame 51.
11.
Check that the flue terminal and air inlet are unobstructed
and that the fluing and ducting are correctly sealed.
12.
After servicing refer to Frame 42 for final safety checks.
F160 to F280 models
7
4
Remove plastic
cap for access
4
7
SER
VICING
