[]]
CH
Temperature
Control
Potentiometer
(Potentiometer P1)
The
C H pate ntiometer has 2 functions (fig.
21
) :
a)
to
set
the
CH
water temperature.
Winter
mode
start point
Summer
mode
fig.
21
iJ
Information
CH
water
temperature
set
point
can also
be
adjusted
via
external
main
board
communication,
room
thermostat Jhe
CH
potentiometer
has
no
effect
anymore
on
the system
if
the system has
the
room
thermostat
and
also
it
is active.
Additionally,
CH
potentiometer
should
be
the
maximum
position.
b) to select summer/winter mode.
-
The
winter
mode
is
in
the range
of
40
to
80
°C.
-
The
summer
mode
can
be
activated
by
turning the
CH
potentiometer
to
the minimum position.
[!]
DHW
Temperature
Control
Potentiometer
(Potentiometer P2)
The
DHW
potentiometer has the function to set the
DHW
water temperature between 35°C
and
60° c (fig. 22).
fig.22
[[]
Reset (PB1), Service (PB3)
and
Chimney Sweep (PB4) Push-buttons
PB
l
PB2 PB3
PB4
fig.23
-Reset push-button
PBl
is
used to reset main board
if
the
errors
cause a lock-out condition.
-Service push-button
PB3,
is
used only
by
qualified person, permits
to
adjust the service setting
parameters.
-By
means
of
chimney sweep push-button
PB4,
it
is
possible
to
activate the chimney sweep
mode
and
to
operate
the
appliance
in
the minimum I maximum running mode.
It
is
used only
by
qualified person.
-Push-button
PB2
has no function
in
colora gas combination boilers.
~
Service (PB3)
and
chimney
sweep
(PB4)
push-buttons
must
be
~
used
only
by
qualified
person.
27
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