boiler protection devices
53
maintenance
Maintenance is an essential part of the safe and
effi
cient operation of the boiler and ensures its
durability. It should be performed according
to the instructions given in current legislation.
Perform combustion analysis regularly in order
to check the operating effi
ciency of the boiler
and to make sure any polluting substances
relased are within the boudaries set by current
legislation.
Before beginning maintenance work:
- Disconnect the appliance from the
electricity supply by turning the external
bipolar switch to the “OFF” position;
-
Close the gas valve and the central heating
and domestic hot water system valve.
After the work has been completed the initial
settings will be restored.
General comments
It is recommended that the following
inspections be carried out on the boiler at least
once a year:
1. Check the seals in the water part and, if
necessary, replace the gaskets and restore
the seal to perfect working order.
2. Check the seals in the gas part and, if
necessary, replace the gaskets and restore
the seal to perfect working order.
3. Visually check the overall condition of the
boiler.
4. Visually check the combustion and, if
necessary, disassemble and clean the
burner.
5. Following the inspection detailed in point
“3”, disassemble and clean the combustion
chamber, if necessary.
6. Following the inspection detailed in point
“4”, disassemble and clean the burner and
injector, if necessary.
7. Cleaning the primary heat exchanger
8. Make sure the following heating safety
devices are operating correctly:
- temperature limit safety device.
9. Make sure that the following gas part
safety devices are operating correctly:
- absence of gas or fl ame safety device
(ionisation).
10. Check the effi
ciency of the domestic hot
water production process (test the fl ow
rate and temperature).
11. Perform a general inspection of the boiler
operation.
12. Remove oxide from the detection electrode
using an emery cloth.
Operational test
After having carried out the maintenance
operations, fi ll the heating circuit at a pressure
of approximately 1.0 bar and release the air
from the system.
Fill the domestic hot water system at the same
time.
- Begin operating the boiler.
- If necessary, release the air from the heating
system again.
- Check the settings and make sure all the
command, adjustment and monitoring parts
are working correctly.
- Check the seal and that the system for the
expulsion of fumes/suction of comburent air
is operating correctly.
Draining procedures
The heating system must be drained using the
following procedure:
- Switch off the boiler, make sure the external
bipolar switch is in the OFF position and shut
off the gas valve;
- Loosen the automatic air relief valve;
- Open the system discharge valve and collect
the escaping water in a container;
- Empty the water from the lowest points of
the system (where applicable).