28
Inspections and maintenance performed
professionally 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.
The maintenance frequency must comply
with standards in force.
Failure to perform Inspections and Main-
4
INSPECTION AND
MAINTENANCE
4.1 - INSPECTION AND MAINTE-
NANCE INSTRUCTIONS
To assure long-term functioning of your boiler 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-off valve upstream the boiler.
• If needed, and depending on the intervention to
be carried out, close any shut-off valves on the
ow and return line of the heating system, as well
as the cold water inlet valve.
• Remove the front casing from the appliance.
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 pres-
sure until reaching a pressure of 0.8/1.0 bar.
• Open the gas shut-off valve.
• Switch the boiler back on.
• Make sure the appliance is gas tight and water-
tight.
• Remount the front casing of the appliance.
tenance can entail material and personal
damage
TABLE OF RESISTANCE VALUES, ACCORDING TO THE TEMPERATURE, TO THE HEATING PROBE 11 (SR)
AND TO THE DOMESTIC HOT WATER PROBE 1 (SS) AND ANY HEATING RETURN PROBE 22 (SRR) see par. 4.5.
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 probe SR and of the domestic hot
water probe SS
Example: At 25°C, the nominal resistance is 10067 Ohm At 90°C,the nominal resistance is 920 Ohm
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