18
Ref. : CH - 1249 - A - 2
5 - 1 Filling
- Water quality for the heating system
Avoid using hard water, which may scale the boiler. If TH
or total hardness is above the French 25°, the boiler
should be filled with softened water.
- Filling the boiler and heating system
While filling, which must be done slowly, ensure that the
stop valves are open and that the mixing valve can be 1/
2 open.
The automatic drain cock plug, normally fitted on the
boiler outlet, must remain untightened in order to achieve
continuous draining during filling-up. Drain all high points
of heating system and close the various draining screws
one after the other as soon as water reaches their level.
After filling the boiler for the first time, flush completely
(using the sludge flushing valve) in order to get rid of
foreign bodies that may come into the components or the
pipes during assembly.
- Water topping up
Subsequent boiler topping-up should be practically non-
existent and in all cases controlled and registered by a
water flow meter. Frequent topping-up is the a symptom
of a leakage which should be repaired as soon as possi-
ble.
5 - 2 Preliminary checks
When commissioning the boiler for the first time in the
season, or after a prolonged shutdown period :
- ensure that filling was done properly and check overall
tightness. If necessary, put more water and drain all high
points until water flows slightly.
- check the connection of the flue stack and the proper
working condition of the draught regulator if any
- check that the high and low vents are not obstructed
- ensure that the doors and the flue access plates are
closed and tight
If necessary, act upon the tightening points.
- ensure that the burner is properly locked
- check if it is properly supplied in fuel, that supply and
return valves are open
- for operation with gaseous fuel types, check that the
safety conditions are fulfilled.
Note :
After starting up a system for the first time, it is
recommended to clean the pump filter in the case of oil firing,
or the line filter in the case of gas firing.
After a few hours of operation, check the tightness of the
doors. If necessary, tighten their fastening nuts.
5. COMMISSIONING
6. MAINTENANCE
Boiler
Check water pressure on pressure gauge and, if necessary,
restore normal pressure. Only perform this operation when
the system is cold. If frequent topping-up is necessary, there
is a leak in this case, notify the installer. Never draw water
from the heating system. In order to avoid slow but steady
sooting, harmful to proper boiler operation, it is recommended
to clean it regularly twice a year at least.
This is always done with the boiler stopped and the power
supply cut out.
Proceed as follows :
• put ON burner switch located on the control panel as well
as the main boiler room switch
• remove casing front panels
• open the cleaning door and the chamber door and take
the flue-way hatches away.
• take the optimizing baffles down and brush them.
• clean the walls of each flueway with the brush provided
with the boiler as well as the combustion chamber walls.
• remove soot and combustion deposits, if possible using
a vacuum cleaner
• Clean the inside of the smoke hood
• the lagging material of the doors may be brushed with a
soft brush. Do not use a metal brush. Be careful not to
damage the seal.
• once the cleaning is over, put the hatches back up on
the smokebox, put the optimizing baffles back in their
respective "flue-ways", close the chamber and cleaning
doors, ensuring that they are tight.
• set casing front panels back up.
Sludge
This sludge, due to corrosion in the system, travels inside the
pipework and makes up deposits in the boilers. We
recommend to rinse the boiler efficiently and thoroughly
and check the flushed water quality.
Burner
The burner should be submitted to regular maintenance. See
special instructions, provided with the burner. If necessary,
contact the retailer or manufacturer of the burner.
Summary of Contents for NXR3
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