Technical data

20.1 inspection
a) Ask the user about any problems with the boiler unit or any other comments.
b) Check the water pressure of the installation.
c) Remove the casing of the unit and inspect all pipes and connections for water leaks.
d) Inspect the top of the casing and/or the top of the upper heat exchanger for water leaks or signs of water
from the flue air supply tube.
e) Open the siphon cleaning rinsing point at the base of the unit.
f) If you have a notebook computer, connect it and check the service page for any errors, messages, starts
and successful restarts. (Special communication lead and service software required)
g) Run the unit at maximum capacity and measure the input and the CO2%.
h) Run the unit at minimum capacity and measure the input and the CO2%.
i) Listen to the sound of the in built pumps.
j) Disassemble each burner by removing the six M6 nuts around the burner door, removing the ignition cable and
pulling the burner forwards. When the burner has been pulled forwards to halfway across the burner area, the
plug on the fan cable must be removed from the fan motor. Check the interior of the heat exchanger.
k) Disassemble the plastic box at the suction side of the fan, inspect the fan blades.
I) Check the distance between the electrode and the burner; this should be 4 to 5 mm.
20.2 maintenance
Depending on the results of the inspection carry out any maintenance and if necessary any preventive
maintenance.
Possible actions include:
at a) The remarks and comments of the client must be taken seriously and the cause(s) of any faults or problems
must be found.
at b) The pressure of the installation must be between 1 and 2 bar: any possible leaks in the system must be
identified; if necessary, have a pipework engineer solve the problem.
at c) Possible leaks or weeping must be resolved immediately.
at d) In case of water leakage or ingress from the air supply pipe, the cause must be found.
at e) If the condensation in the siphon is highly contaminated, the siphon must be rinsed. With the burners
removed, use a filling hose to insert water into the heat exchanger, which will automatically reach the siphon.
at f) Draw your conclusions from the service screen and attend to those parts that have caused any faults.
at g) and at h) If necessary, adjust the gas setting on the gas valves.
at i) If the in built pumps make an un-natural noise, and in particular if the pumps are more than 5 years old, it is
recommended that the pumps should be replaced by way of preventive action.
Note the pumps are fully modulating and do have characteristic a “yet yet” noise which is normal at low speeds.
at j) NEVER CLEAN THE BURNER ITSELF
If the interior of the heat exchanger is contaminated and/or there is a deposit on the surfaces of the coiled
stainless steel pipes, the latter must be removed with a hard brush or citric acid. (DO NOT USE A STEEL
BRUSH!) Then remove any dirt with a vacuum cleaner