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54 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.
Keston 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.
1. Light the boiler and carry out function checks, noting
any operational faults.
2. Run the boiler for 5 minutes and then check the gas
consumption rate. Refer to procedure opposite on how
to force the burner to maximum rate.
3. Optional test - Connect a suitable gas analyser to the
sampling point fitted in the flue adapter. For correct
boiler operation the CO/CO
not be greater than 0.004 ratio and the CO
should match those in table 1. 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.
4. Remove and clean the burner. Refer to Frames 56 and
57.
5. Inspect the heat exchanger through the burner opening.
If there are signs of aluminium oxide build up, spray
water down the flueways. Refer to Frame 58.
6. Remove the sump cover and scrape out any deposits.
Refer to Frame 59.
7. Remove the condensate trap and flush through with
water. Refer to Frame 60.
8. Check that the flue terminal is unobstructed and that the
flue system is sealed correctly.
9. After completion of servicing refer to Frame 53 for
reference to final safety checks.
55 CASinG ReMoVAl
front Panels
1. Pull the two sides of the control casing door to open.
2. Remove the two screws retaining the front panel, lift the
panel to remove.
3. Remove the two screws retaining the control panel and
swing the panel down into the service position.
Side Panels
Note. Removal is not required for normal service.
1. Remove the two (or three) screws from the top and bottom
of the side panels.
2. Re-assemble in reverse order.
Keston Heat -
Installation & Servicing
SERVICING
ratio of the flue gas should
2
values
2
SettinG to MAxiMUM oUtPUt
Ensure that there is a current CH demand to the boiler (e.g. the
CH Switched Live is on)
Press SELECT and the following screen witll be displayed.
The kW output number in the 1st line will vary depending on the
maximum output of the boiler.
Keston 45kW
normal operation
Set Stat 1 Temp'
Set Stat 2 Temp'
Rotate 1st stat clockwise until the following screen is displayed
Keston 45kW
Set Stat 2 Temp'
Set off/Sum/Win
Out' Sensor Slope
State of Inputs
Press SELECT and the following screen will be displayed
Set Off/Sum/Win
Standby
Summer
Winter
Press - for more
Press + and - until the followint screen is displayed.
Set Off/Sum/Win
Minimum
Maximum
Press - for more
Press ENTER and the boiler will go to Maximum Rate for 5 minutes
Operation will be automatically reset at the end of 5 minutes
2
3
45
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