10
2008-03
Vedolux 37
Operation and maintenance
Ceramic – combustion tunnel
The ceramic grate and combustion tunnel are wearing parts
that will have to be replaced over time. Wearing parts are not
covered by any guarantee. Small cracks in the ceramic are not
abnormal and no action is necessary.
To increase the service life of these parts, follow these instruc-
tions:
• Do not remove the ceramic when cleaning the boiler combustion cham
-
ber.
• Scrape the ceramic gently and carefully when removing ash from the
boiler.
• Leave a couple of centimetres of ash as a protective layer on the grate
and the combustion tunnel.
Pieces of charcoal from the previous burning cycle can be left for the
next cycle.
• Only use “real” wood, avoiding plastic, treated timber, refuse, etc.
• Place the wood in the boiler, do not throw it in.
• If the boiler/ceramic is new or if the boiler has not been used for a while,
light a small fire to heat the ceramic and remove any moisture.
Safety valves
In order to preserve the safety function, the safety valves for the
domestic hot water system and the heating system must be op-
erated regularly, around four times a year.
Open and close the safety valve manually around four times a
year, checking that a small amount of water escapes and that
the valve closes again properly.
Also check that there is sufficient pressure in the system. If nec
-
essary, add more water.
Venting
Regularly check that there is sufficient water in the heating sys
-
tem.
Air may remain in the system for a while after installation, so
bleeding should be repeated a few times. After bleeding, check
the pressure and add water if necessary.
Water pressure in the system
The pressure required in the heating system depends on the
height difference between the lowest and highest points in the
system, the static head. If the level difference is 5 metres, the
pressure is 0.5 bar, if it is 10 metres, the pressure is 1 bar.
The pressure required in the heating system depends on the
height difference between the highest and lowest points in the
system, the static head.
Note that the pressure in the system varies with the boiler tem-
perature – do not add water unnecessarily.
The volume of water changes with the temperature, and the
change in volume affects the pressure in the system. The higher
the temperature the greater the volume and the higher the pres-
sure. The expansion vessel takes up the changes in volume.
The flow temperature – and therefore also the pressure – is
higher in the summer than the winter.
Unvented expansion system
The pressure in the unvented expansion vessel should be
checked at intervals of several years. The vessel must not be
exposed to any pressure from the heating system.
Overheating protection
The overheating protection, which stops the fan if the boiler
temperature is too high, is reset on the boiler control panel. The
boiler temperature must have fallen to below 95°C before you
can do this.
If there is a risk of freezing
In severe cold weather, no part of the heating system should be
turned off as this would involve a risk of burst pipes.
Never start a burning cycle if you suspect that any part of the
heating system might be frozen. Call the installer.
If the heating system will be turned off for an extended period,
the water should be drained.
Draining the boiler
The boiler must not be running while it is being drained.
Close the valves to the heating system.
Run the water to a floor drain via a hose connected to the boiler
drain valve, R15.
Allow air into the system by opening the boiler safety valve.
The drain valve for the heating system must be located in a con-
venient place.
Boiler cleaning
Keep the boiler clean and tidy.
Alkaline cleaning agents are useful for removing soot marks
from the boiler. Do not use strong solvents.
Pellet burner
For optimum reliability and efficiency, it is essential to check and
adjust the burner regularly.
The boiler temperature should not be allowed to fall below 70°C
Oil burner
For optimum reliability and efficiency, it is essential to check and
adjust the burner regularly.
The boiler temperature should not be allowed to fall below 70°C
