Servicing; Servicing Schedule - Keston HEAT 2 45 Installation & Servicing

3.

SERVICING

3.1 SERVICING SCHEDULE

Note. Refer to "System Set up information" at rear of User
Guide.
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 Heating 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 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
ratio of the flue gas should not be
operation the CO/CO
2
greater than 0.004 ratio and the CO
those in table 1. If this is the case and the gas input is at
least 90% of the nominal, unless the maximum length of
flue/air inlet is used then gas input is at least 80% 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 Sections 3.6. If after
cleaning the burner the gas input is not at least 90% of the
nominal then contact the boiler manufacturer.
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 Section 3.5.
6. Remove the sump cover/Helmholtz where fitted and scrape
out any deposits. Refer to Section 3.8.
7. Remove the condensate trap and flush through with water.
Refer to Section 3.7.
8. Check that the flue terminal is unobstructed and that the
flue system is sealed correctly.
9. After completion of servicing Refer to Section 2.32 for
reference to final safety checks.
Installation & Servicing
SECTION 3 - SERVICING
SETTING TO MAXIMUM OR MINIMUM OUTPUT
Ensure that there is a current CH demand to the boiler (e.g. the
CH Switched Live is on)
Press "OK" and the following screen witll be displayed.
values should match
2
Press "OK" and the boiler will go to Maximum Rate for 10 minutes
after which normal operation will resume.
KESTON Heat2 50kW
Operation: Off
Flow setp: 0.0ºC
Flow temp.: 40.4ºC
Menu
Configuration
Boiler Menu
Plant
Menu
Boiler Menu
Plant
Heating circuits
Boiler Menu
Service
Hours run
Fault history
Service
Service min
Service max
Service variable
Service
Service min
Service max
Service variable
Service max
Boiler 1
Boiler 1 Service
Operation: Service max
Flow temp.: 40.4ºC
Capacity: 100%
53