30
Service info
1. Adjustment of maximum
output in heating mode
It allows to adapt the boiler ou-
tput to the actual C.H. needs by
adjusting the burner pressure:
By rotating the trimmer 1
clockwise the pressure increases;
By rotating anticlockwise the
pressure decreases.
2. Adjustment of the
modulation current
Allows to adjust the minimum gas
pressure
THIS ADJUSTEMENTS MUST
BE CARRIED OUT SOLELY BY
TRAINED TECHNICIANS
To accede to the trimmer it is necessary to
dismantle the electrical panel
The uncontrolled adjustment of the pot.
meter can jeopardize the correct opera-
tion of the boiler
WARNING
The adjustments of the pot. meter 1-2-3 are
carried out by the constructor.
3. Adjustment of the soft
light
Allows to adjust the burner
pressure at the ignition time.
1
2
3
SOLUTIONS
a)
Check the status of the system
b)
Check the pump.
a)
Heat the boiler inside until the temperatu-
re exceeds 2°C.
b)
Replace D.H.W. sensor.
c)
Reconnect or replace it.
d)
Set the correct pressure value.
e)
Reconnect it.
f)
Replace it.
a)
Check the D.H.W. system.
b)
Reconnect or replace it.
c)
Reconnect it.
d)
Replace it.
POSSIBLE CAUSES
a)
Water does not circulate in the heating sy-
stem. Pipes are blocked, the thermostatic val-
ves are closed or the system gate valves are
closed.
b)
The circulation pump is blocked or is faulty
a)
The boiler may be frozen. (2.10.7)
b)
The D.H.W. sensor is faulty. (2.10.6)
c)
One or both temperature sensors are discon-
nected or faulty. (2.10.5 or 2.10.6)
d)
There is insufficient water pressure in the
C.H. system (2.10.2)
e)
The minimum water pressure switch is
disconnected.
f)
The The minimum water switch is faulty.
a)
There are insufficient pressure or flow rate in
the D.H.W. system.
b)
The flow switch sensor is disconnected or
faulty.
c)
The flow switch is disconnected.
d)
The flow switch is faulty.
BOILERS STATUS
The boilers is in permanent lock-out. The red
light
G
is off
INCONVENIENT:
The heating sensor detects a temperature
higher than 81°C
The reset is automatically done after the re-
moval of the fault’s cause.
The boiler is in permanent lock-out. The red
light
G
is off
INCONVENIENTS:
a) - The heating sensor detects a
temperatur lower than 2°C
b) - The D.H.W. sensor detects a tempera-
tur higher than 62°C
c) - The PCB does not detected the pre-
sence of either or both temperature sen-
sor
d) - e) - f) The minimum water pressure
switch does not give the burner the per-
mission to ignite.
The boiler does not operate in D.H.W. mode
INCONVENIENT:
The D.H.W. flow switch does not operate
* These conditions are detected as error codes
(see 2.10.2 - 2.10.5 - 2.10.6 - 2.10.7)
Summary of Contents for RTN 24
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