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ENGLISH
Maintenance instructions
ROUTINE YEARLY VERIFICATION OPERATIONS
-
VG
(Gas valve) ( 3 )
Does the valve modulate properly? The verication is performed on the
“Calibration” requiring 100%, in 50%,
the minimum percentage of modula-
tion.
Make sure that the ame modulate.
SR (heating sensor)( 11 )
SS (domestic hot water sensor) ( 1 )
Do the sensors maintain the
original characteristics?
12571 ohm at 20° C / 1762 ohm at
70° C.
Measurement to be taken with the
wires disconnected (see table Res/
Temp).
E ACC ignition electrode (28)
E RIV. detection electrode (27)
Does the discharge of sparks before
putting the boiler in safe conditions last less
than 3 sec.?
Flame present but not detected
Detach the electrode ionisation wire
and check the securing time.
Check connection cable (oxidation
socket) or condizoni / detection elec-
trode placement.
TL (anti-overheating
limit thermostat) ( 10 )
Does the TL put the boiler in safety conditions
when overheating?
Heat the TL until it intervenes at 102°C
and check that it intervenes at 102°.
DK (safety pressure switch against
water deciency) ( 13 )
Does the pressure switch block the boiler
if the water pressure is below 0.4 bar?
Without request: close the shut-o valves
of the heating circuit, open the drain
valve to make the water pressure de
-
crease. Before pressurising again, check
the pressure of the expansion vessel.
Condensation drain trap (27) Has the trap got deposits on the bottom? Clean the trap with water.
Heat exchanger body ( 9 ) 1) Measure the Thermal Capacity using a me-
ter and compare the value with that contained
in table 3.12. The data measured indicates if
the exchanger needs cleaning.
2) Check that the space between the rungs of
the exchanger are not clogged
It is recommended to use the products
purposely created by Unical (see sys-
tem protection ACCESSORIES sect. in
the domestic price list), being careful
to wash the area with most rungs rst
(lowest part visible from above) and
then the upper part if necessary.
Burner ( 5 ) Check the state of cleanliness of the burner
mesh
Remove any deposits using com-
pressed air, blowing from the mesh
side.
( Num ) = see key Par. 2.2
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 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
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
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