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WD53/0/1999
To ensure the continued safe and efficient operation of the boiler it is necessary to carry out
routine servicing at regular intervals. The frequency of the servicing will depend upon the particular
operating conditions, but it is recommended that an annual service should be carried out by a
qualified engineer.
It is the law that any service work must be carried out by competent qualified persons.
6.1
Pre-Service Checks
It is recommended that an inspection should be carried out prior to shutting down the unit
for servicing. Open the front doors by turning the door catches 90 degrees. The following
items should be observed:
a.
Smooth starting and running of each modules blower.
b.
Smooth lighting of each modules burner.
c.
Check for leakage of gas, gas/air or combustion products.
d.
Check for condensate leaks.
e.
Check the colour and appearance of the flame on each module. A sky blue flame
slightly off the burner gauze is normal. The burner itself should appear dark.
f.
Check that the temperature differential between the flow and return pipes is less
than 15
g.
Check for water soundness.
h.
Inspect the flue vent and air intake pipework. Joints must be sound and all
pipework well bracketed.
i.
Check that there is a steady fall back to the boiler from the flue pipe to allow
condensate to run back into the boiler.
j.
With the boiler operating at a low return temperature (i.e. less than 50
that the condensate flows freely from the condensate line.
6.1.1
Module Burner & Heat Exchanger Blockage Checks
i)
ii)
iii)
iv)
v)
vi)
vii)
viii)
ix)
x)
xi)
xii)
xiii)
xiv)
xv)
Installation & Servicing Instructions
Chapter 6 : Servicing
6. ROUTINE (ANNUAL) SERVICING
o
C. The temperature difference should be between 10
Turn off the boiler & shut off the gas supply to the boiler.
Remove the pressure point screws from points A & B on the heat
exchanger for the left hand module. Attach a differential gauge.
Turn on the boiler and wait for the fan to reach full speed. Obviously the
burner will not light.
The pressure difference should be less than 10.0 mbar. If not clean the
burner.
Turn off the electrical supply to the boiler.
Remove the pressure point screw from point C and transfer the tube from
point A to C, replacing the screw on point A.
Turn on the electrical supply to the boiler (gas still off), wait for the fan to
reach full speed.
The pressure difference should be between 9.5 mbar and 13.5 mbar
(lowest value represents new appliance). If not clean heat exchanger.
Disconnect the gauge from point B. Refit the screw.
Read pressure of point C.
The maximum pressure should be 3.5 mbar. If the pressure is greater
than this check the flue for blockage.
Turn off the electrical supply to the boiler
Repeat the procedure for the right hand module.
Remove the pressure gauge tube and refit the screw.
Open the gas service cock.
The Keston 260 & 340 Condensing Boilers
o
o
C and 15
C.
o
C) check
Page : 35
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