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WD420/3/2007
To ensure the continued safe and efficient operation of the boiler it is necessary to carry out
routine servicing at regular intervals. Servicing must be carried out at least once per year. The
frequency of the servicing will depend upon the particular operating conditions.
It is the law that any service work must be carried out by competent qualified persons.
NB:
When servicing ensure that the gas and electrical supplies to the boiler are isolated before
any work starts.
Hazardous materials are not used in the construction of the Qudos 28s and Qudos 28sP.
However, due care should be taken when handling boiler components.
All joints should be checked for tightness after servicing and before firing the appliance.
After servicing complete the Gas Boiler Commissioning Checklist - Service Interval Record
(Chapter 10). These forms (Chapter 10) should be kept in a safe place for the life of the
boiler.
7.1
Pre-Service Checks
It is recommended that an inspection should be carried out prior to shutting down the unit
for servicing. Remove the front cover by removing the screws retaining the top and
bottom. The following items should be observed:
a.
Smooth starting and running of the blower.
b.
Smooth lighting of the burner.
c.
Check for leakage of gas, gas/air or combustion products.
d.
Check all flexible joints and hoses for condition and soundness - replace if
necessary
e.
Check for condensate leaks.
f.
Check for water soundness.
g.
Inspect the flue vent and air intake pipework. Joints must be sound and all
pipework well bracketed.
h.
Check that there is a steady fall back to the boiler from the flue pipe to allow
condensate to run back into the boiler.
i.
With the boiler operating at a low return temperature (i.e. less than 50
that the condensate flows freely from the condensate line.
7.2
Recommended Routine Service
a.
Remove the outer case by first removing the securing screws at the top and
bottom of the appliance.
b.
Remove the burner head (Section 8.6) and inspect the burner appearance. Black
markings or other discoloration's on the gauze indicate too much gas or a lack of
air possibly due to a blocked air inlet. Any breakage's or damage to the burner
mesh indicate the burner must be replaced.
c.
If necessary clean the burner with a mild household detergent and rinse under a
hot running tap.
d.
If necessary, from visual inspection, clean the heat exchanger using a suitable
stiff plastic bristle brush, vacuum out any large particles and flush the heat
exchanger with fresh water until the water flowing from the condensate drain is
clear.
e.
Remove the condensate trap (Section 8.8) and clean by flushing through with
clean running water.
f.
Check the electrode assembly mounted on the heat exchanger. If the point is
damaged or burnt replace it.
Check that the spark gap measures 4 mm.
Installation & Servicing Instructions
Chapter 7 : Servicing
7. ROUTINE (ANNUAL) SERVICING
The Keston Qudos 28s & Qudos 28sP Boilers
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C) check
Page : 44
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