30
ROUTINE Y EARLY VERIFICATION OPERATIONS
COMPONENT: VERIF: CONTROL/INTERVENTION
METOD:
FL
( domestic hot water
priority ow switch ( 2 )
Is the minimum domestic hot water
ow rate 3 l/min.?
The b urner must ignite with an
intake ab ove or equal to: 3 l/min.
VG
( Gas va lve ) ( 3 )
Does the v alv e modulate properly ? Open a hot water tap at maxi mum
flow rate and then at minimum.
Make sure that the ame modu-
lates.
SR ( heating sensor) ( 11 )
SS ( domestic hot water sensor)
( 1 )
Do the sensors maintain the origi-
nal characteristics?
12571 ohm at 20° C / 1762 ohm
at 70° C.
Measurement to b e take n with the
wires disconnected ( see tab le Res/
Temp).
E ACC/RIV. ( ignition/detection
electrode) ( 4 )
Does the discharge of sparks b e-
fore
putting the b oiler in safe conditions
last less than 10 sec.?
Detach the electrode ionisation
wire and check the securing time.
TL ( anti-ove rheating
limit thermostat) ( 10 )
Does the TL put the b oiler in safety
conditions when ove rheating?
Heat the TL until it interv enes at
95°C and check that it interve nes
at 95°.
DK ( safety pressure switch
against water deciency) ( 13 )
Does the pressure switch b lock the
b oiler if the water pressure is b elow
0.4 b ar?
W ithout request: close the shut-off
va lve s of the heating circuit, open
the drain va lve to make the water
pressure decrease. B efore pres-
surising again, check the pressure
of the exp ansion ve ssel.
Exp ansion ve ssel ( 8 ) Does the ve ssel contain the right
amount of air?
Check the pressure ( 1 b ar when
the b oiler is empty) . P ressurise the
b oiler ( open the pump automatic
ve nt va lve ). Open the heating cir-
cuit closing va lve s.
Domestic hot water ow rate Filter in cold water inlet ( 2 ) Clean the lter with limescale re-
move r.
Heat exch anger b ody ( 9 ) Check that the space b etween the
rungs of the ex changer are not
clogged
Eliminate the deposits without
damaging the exch anger, using a
soft bristle brush and specic, non
ammable detergents.
B urner ( 5 ) Check the state of cleanliness of
the b urner mesh
Remove deposits using a soft b ris-
tle b rush and b low on each single
ramp from the outside and from
the ve nturi.
( Num ) = see ke y P ar. 2.2
ENTION
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ENTION
The b urner must ignite with an
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The b urner must ignite with an
intake ab ove or equal to: 3 l/min.
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intake ab ove or equal to: 3 l/min.
Open a hot water tap at maxi mum
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Open a hot water tap at maxi mum
flow rate and then at minimum.
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flow rate and then at minimum.
Make sure that the ame modu
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Make sure that the ame modu
12571 ohm at 20° C / 1762 ohm
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12571 ohm at 20° C / 1762 ohm
at 70° C.
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at 70° C.
Measurement to b e take n with the
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Measurement to b e take n with the
wires disconnected ( see tab le Res/
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wires disconnected ( see tab le Res/
Temp)
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Temp)
Does the discharge of sparks b e
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Does the discharge of sparks b e
putting the b oiler in safe conditions
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putting the b oiler in safe conditions
last less than 10 sec.?
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last less than 10 sec.?
Detach the electrode ionisation
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Detach the electrode ionisation
wire and check the securing time.
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wire and check the securing time.
Does the TL put the b oiler in safety
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Does the TL put the b oiler in safety
conditions when ove rheating?
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conditions when ove rheating?
Heat the TL until it interv enes at
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Heat the TL until it interv enes at
95°C and check that it interve nes
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95°C and check that it interve nes
at 95°.
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at 95°.
Does the pressure switch b lock the
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Does the pressure switch b lock the
b oiler if the water pressure is b elow
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b oiler if the water pressure is b elow
0.4 b ar?
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0.4 b ar?
W ithout request: close the shut-off
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W ithout request: close the shut-off
va lve s of the heating circuit, open
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va lve s of the heating circuit, open
Does the ve ssel contain the right
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Does the ve ssel contain the right
amount of air?
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amount of air?
Domestic hot water ow rate
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Domestic hot water ow rate
Filter in cold water inlet
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Filter in cold water inlet
Heat exch anger b ody
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Heat exch anger b ody
( 9 )
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( 9 )
Check that the space b etween the
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Check that the space b etween the
rungs of the ex changer are not
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rungs of the ex changer are not
clogged
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clogged
B urner
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B urner
( 5 )
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( 5 )
( Num ) =
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( Num ) =
see ke y P ar. 2.2
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see ke y P ar. 2.2
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