Beretta Alpha DGT User manual

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P ROGRAMMABLE
7- DAY THERMOSTAT
Installation and user instruction
This instructions to be retained by the user

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Thank you for choosing Beretta’s weekly
programmer.. This central heating control
device is easy to fit, and with correct use,
will deliver improved comfort levels in
your home whilst saving you money.
This thermostat is designed to be used
only with heating controls system with a
maximum switching load of 2A at 30VDC
or 0,25A at 230VAC or with Beretta
boilers fitting a bus protocol connection
If installing for someone else, please
ensure that the instructions are handed to
the householder.
Warning: Please read this manual prior
to installation or use.
Shock Hazard: This unit must be
installed by a competent person, in
accordance with local regulation, or other
relevant national regulations and codes of
good practice. Always isolate the AC
Mains supply before installing this unit.
CE: This product is according R&TTE
Directive 1999/5/EC
Installation warning:
This programmer can be used either as a
central heating ON/OFF thermostat and
as boiler remote control (only with
selected Beretta boilers), therefore is
mandatory to determinate the correct
working mode (denominated TYPE)
before installation and setting.
From the main menu select the TYPE
parameter and those are the following
option (the selection need the batteries to
be done).

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Type
Description
crt
Room thermostat working with
ON/OFF command to the boiler.
Connect the cable to room thermostat
connection on the boiler. Maximum
switching load of 2A at 30VDC or
0,25A at 230VAC.
rEc
Boiler remote control using a bus
protocol to communicate with the
boiler. Connect the cable to remote
control connection on the boiler.
crS
To be used only when boiler is set in a
“continuous pump running mode”.
Room thermostat working with
ON/OFF command to the boiler.
Connect the cable to room thermostat
connection on the boiler. Maximum
switching load of 2A at 30VDC or
0,25A at 230VAC.
r
ct
To be used only when boiler is set in a
zone valve management mode. Boiler
remote control using a bus protocol to
communicate with the boiler. Connect
the cable to remote control connection
on the boiler. Additionally the wired
device activate the ON/OFF built in
relay at any room heat request directly
to the zone valve.
Your programmer is a room thermostat
(recognized by no house icon on display)
– type crt
Your programmer is a boiler remote
control (recognized by house icon on
display) – type rEc

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Fast room
temperature
adjusting
buttons
Fast
DHW
adjusting
buttons
(rEc only)
Heating
mode button
Programming
button

5
Display
Temperature
sensor
Adjusting
buttons
Heating
mode button
Batteries
flap

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I NSTALLATION AND OPERATING INSTRUCTIONS
The installation of the device need two
wires to connect to the boiler, the devise
need the battery if working with type
ON/OFF. Batteries are not needed is the
type selected is rEc.
W ARNING : REMOVE THE BATTERIES
WHEN USED IN R E C TYPE ( REMOTE
CONTROL ) – EXPLOSION CAN
HAPPEN
Important: these instructions should be
read in conjunction with the appliance
installation instructions. It is
recommended that this device is installed
by a qualified electrician.
P ACKING LIST Q TY
7-day programmer 1
Anchors and screws 4
Double side adhesive 3
Instructions 1
Carton internal packaging 1
Batteries (used only in crt type) 2
N OTE :Eventual additional electronic
boards necessary to connect the
controller to the boiler main board are not
included in this box and need to be
purchased separately .
P REPARATION :Isolate the appliance from
the electrical supply and remove the
appliance casing and PCB cover (refer to
boiler installation instructions for specific
details).

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I NSTALLATION OF PROGRAMMER
Position the programmer on a wall
surface away from obstructions and direct
heat sources or draughts, in a room that
is warmed by the heating system. The
fixing of the transmitter can be done
either with the anchors and screws or
with the double sided adhesive (both
supplied). See the diagram below as
reference to drill the wall.
In the case of using anchors, the
transmitter box must be open to fix the
screws to the anchors internally the box.
See the diagrams below for removal from
and re-assembly to backplate. Pay
attention because it could be difficult to
open, follow the diagram for an easier
opening procedure.
W ARNING ! D O not touch the printed circuit
board of the transmitter as it contains
electrostatically sensitive components.
E LECTRICAL CONNECTION
On the back side of the programmer,
once open, there are 2 couple of
connections.

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Connection indicated as OT (printed on
the PCB) = use this when use the
programmer as remote control (type rEc)
Connection indicated as RELAY
(printed on the PCB) = use this when use
the programmer as room thermostat (type
crt).
Important: never connect the OT+
contact to 230V supply to avoid the
destruction of the bus circuit.
Important: the link-wire (if fitted) must be
removed from room thermostat terminals
(both installation type)
W ARNING : select the equivalent
programmer type as installed on the main
menu and remove the batteries after if the
type rEc is selected.
F UNCTIONS
The Beretta Programmable 7-day
Thermostat has the following functions:
Type Room thermostat (crt): for the
display appearance in this mode, please
refer to the relevant section of this
manual. The internal temperature sensor
detects the temperature and, comparing
with the set point, switches ON or OFF
the heating request (according the
programmed timing). The temperature
sensor is located on the left side of the
item.
Temperatures: there are two level of
selectable temperature:
Comfort temperature T1 and economy
temperature T2 (T1 always > T2).
Both are selectable. Additionally there is
a third level of temperature indicated as
frost protection temperature that is
active all the time (the frost protection
temperature is selectable only inside the
technical menu).

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T2 always > Frost protection
temperature)
Time: on the display it is possible to set
and read the time (24 hours display
mode)
Day: on the display it is possible to set
and read the day of the week
Programming timing: it is possible by
selecting the relative timing fascia to
select the desired time. The programming
is possible during 7 day 24-hours and the
minimum time fascia is 30 minutes. The
programming is possible in two separated
temperatures: COMFORT (T1 ) and
ECONOMY (T2 ).
Status mode in crt: select the heating
mode button for fast switching between
the 4 status OFF – AUTO – PARTY -
HOLIDAY.
OFF mode, the heating request to
the boiler is off, on display there is not
equivalent icon, the heating layer and the
programming fascia is off. With this mode
only the frost protection function is active.
AUTO mode: the heating request is
according the programmed timing and
room temperature. In AUTO mode it is
possible to increase or decrease
temporary the room set temperature by
pressing the and buttons, only if
the current time is inside in a heating ON
fascia. The temporary new temperature
set (T1) is maintained only inside the
timing fascia. The next heating fascia will
be back to the original T1 set
temperature. It is possible to check the
set temperature by pressing once the

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or the buttons only if the current time
is inside in a heating ON fascia.
HOLIDAY mode with choice how
many day off (by increasing or decreasing
using the button and ). The
heating request to the boiler is to maintain
the economy temperature on the room
(T2). The number of days off is
considered on the day starting from
midnight. After the counter down is ended
the programmer switch to AUTO mode.
PARTY mode automatically switch
the programmer ON to comfort
temperature (T1). This status is forced up
to midnight, after, the programmer goes
back to the programmed timing fascia.
Type Remote Control (rEc): for the
display appearance in this mode, please
refer to the relevant section of this
manual. The internal temperature sensor
detects the temperature and, comparing
with the set point, calculates the most
suitable boiler flow temperature according
the climatic curve (only if the external
sensor is fitted) and according the
velocity the set temperature is reached.
The programmer continuously
communicates with the boiler control
indicating the target flow temperature (the
values not just an ON/OFF) according to
the calculation made. With this type of
communication it is possible also to
adjust by remote the domestic hot water
(DHW) temperature in case of
instantaneous DHW production or DHW
storage tank controlled by a dedicated
sensor.
The functions of this type (rEc) are the
same as room thermostat type above