42
Inspections and maintenance performed profes-
sionally and according to a regular schedule, as
well as the use of original spare parts, are of the
utmost importance for fault-free operation of the
boiler and to guarantee its long life.
Yearly maintenance of the appliance is mandatory
in compliance with the Laws in force.
4
INSPECTION AND
MAINTENANCE
4.1 - INSPECTION AND MAINTENANCE
INSTRUCTIONS
To assure long-term functioning of your appliance and to avoid
altering its approved status, only original UNICAL spare parts
must be used.
If a component needs to be replaced:
• Disconnect the appliance from the electrical mains and make
sure that it cannot be reconnected accidentally.
• Close the gas shut-o valve upstream of the boiler.
• If needed, and depending on the intervention to be carried
out, close any shut-o valves on the ow and return line of
the heating system, as well as the cold water inlet valve.
Once all maintenance operations are complete
resume boiler operation
• Open the heating ow and return pipes, as well as the cold
water inlet valve (if closed previously).
• Vent and, if necessary, restore the heating pressure until
reaching a pressure of 0.8/1.0 bar.
• Open the gas shut-o valve.
• Switch the boiler on
• Make sure the appliance is gas tight and watertight.
Failure to perform Inspections and Maintenance
can entail material and personal damage
TABLE OF THE RESISTANCE VALUES ACCORDING TO THE TEMPERATURE, HEATING SENSOR (SR) AND DHW
SENSOR (SS) AND HEATING RETURN SENSOR, IF ANY (SRR)
T°C 0 1 2 3 4 5 6 7 8 9
0 32755 31137 29607 28161 26795 25502 24278 23121 22025 20987
10 20003 19072 18189 17351 16557 15803 15088 14410 13765 13153
20 12571 12019 11493 10994 10519 10067 9636 9227 8837 8466
30 8112 7775 7454 7147 6855 6577 6311 6057 5815 5584
40 5363 5152 4951 4758 4574 4398 4230 4069 3915 3768
50 3627 3491 3362 3238 3119 3006 2897 2792 2692 2596
60 2504 2415 2330 2249 2171 2096 2023 1954 1888 1824
70 1762 1703 1646 1592 1539 1488 1440 1393 1348 1304
80 1263 1222 1183 1146 1110 1075 1042 1010 979 949
90 920 892 865 839 814 790 766 744 722 701
Relation between the temperature (°C) and the nom. resistance (Ohm) of the heating sensor SR and of the domestic
hot water sensor SS
Example: At 25°C, the nominal resistance is 10067 Ohm At 90°C, the nominal resistance is 920 Ohm
Danger of burns!
Caution during maintenance operations.
OBLIGATION!
wear protective gloves
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