CALEFFI SATK40 Series Istruzioni per l'installazione, la messa in servizio e la manutenzione - Pagina 6
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Operating cycles
Domestic cycle
(assumes priority over the heating cycle in the default
configuration)
In response to a request for execution of the DHW cycle due to
tripping of the storage thermostat, the regulator opens the primary
circuit modulating valve fully, switches the diverter valve towards
the storage circuit, and starts the circulation pump.
In order to reduce the storage temperature maintenance cycle
times no check is performed on the water temperature supplied to
the storage (ON-OFF regulation).
When the storage temperature is reached the circulation pump is
stopped and the modulating valve is closed.
The domestic water cycle, when active, is indicated by the steady
yellow DHW LED while the symbol is blinking.
Heating cycle - Fixed set point regulation
In response to a heating cycle request from the room thermostat
the circulation pump is powered while the modulating valve is
opened gradually until the set point temperature is reached.
At the end of the heating cycle, the circulation pump comes to a
stop and the modulating valve is closed.
The active heating cycle is signalled by the yellow CH LED which
comes on while the symbol is blinking.
The heating cycle temperature set point can be set using trimmer
P2 and shown on the display.
Floor slab heating function (LOW temperature setting)
Facilitates the installation of underfloor heating systems at low
temperatures. This function can only be activated and executed if
there are no faults.
It can be activated by pressing and holding the RESET button for
8 seconds.
The yellow CH LED blinks while the floor slab heating function is in
operation.
The function lasts 240 hours and is carried out by simulating a
request to run in heating mode starting from a set point of 25°C and
rising in regular intervals to a temperature of 45°C. Once the
maximum set point has been reached the function is executed
following the same procedures, in reverse.
This function has priority over heating and domestic water cycles,
and can be suspended at any time by pressing and holding the
RESET button for 8 seconds.
Optional functions
(to activate/deactivate the optional functions the electric power
supply must always be turned off!)
Heating cycle
Modulating temperature regulation with compensated set
point
The function is enabled by setting DIP switch 1 to the OFF position.
When the function is enabled, the flow temperature is modified
according to the temperature detected by the compensation probe
in order to maintain this latter temperature value constant. This
keeps the actual thermal output of the slab - and therefore the
ambient thermal load - under control. The thermal response time of
the system is thus minimised.
If the function is enabled the display shows the return temperature,
and the flow temperature is adjusted in accordance with the
following formula:
Flow temperature = Return temperature + DT
In MEDIUM/HIGH temperature setting:
At LOW temperature setting:
DHW circuit absolute priority disabling
Heating the hot water storage may, in the presence of a concurrent
demand to perform a heating cycle, significantly delay the heating
cycle and thus compromise the room comfort level. The absolute
priority assigned to the DHW cycle can be disabled by setting dip
switch 5 to ON. In this case, during the period of simultaneous
requests for domestic water and space heating cycles the regulator
will assign periods of 10 minutes between the two cycles. The
active cycle is shown by blinking of the corresponding LED while
the inactive cycle LED remains steady on. By using trimmer P1 the
duration of the storage cylinder heating stage can be set (from 1 to
9 minutes).
(e.g. if you set "6", 6 minutes every 10 will be dedicated to heating
the storage cylinder, the remaining 4 to the space heating cycle).
8 seconds
1
OFF
DT 10–25°C
DT 4–10°C
5
ON
6
4
60
25
4
7
60