EXTERNO
63
Cod. 3541T440 - Rev. 05 - 02/2020
EN
46. GENERAL COMMENTS
It is recommended that the following inspections be carried out on the appliance at least once a year:
1. Check the seals in the water part and, if necessary, replace the gaskets and restore the seal to per-
fect 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 appliance.
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 neces-
sary.
7. Clean the primary heat exchanger.
8. Make sure the following safety devices are operating correctly:
- overheat thermostat.
9. Make sure that the following gas safety devices are operating correctly:
- flame detection electrode (ionization).
10. Check the efciency of the domestic hot water production process (test the flow rate and tempera-
ture).
11. Cleaning the lter in cold water inlet.
WARNING! !
THE APPLIANCE MUST NOT BE PUT IN FUNCTION WITHOUT FILTER.
12. Perform a general inspection of the appliance operation.
13. Remove oxide from the detection electrode using an emery cloth.
47. OPERATIONAL TEST
After having carried out the maintenance operations, rell the appliance with gas and water,and check
the safety following First Ignition instruction.
- Begin operating the appliance.
- 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 discharge of fume, suction of comburent air isoperating
correctly.
48. DRAINING PROCEDURES
The system must be drained using the following procedure:
- Shut off the water mains inlet valve;
- Open the hot and cold water taps;
- Empty the water from the lowest points of the system (where applicable).
To Next Page