46
Functions available for the user
ON-OFF of the unit
When the unit is powered it may be in STAND BY status (the display shows the message
Stby
) or ON status. It is possible to
switch between ON and STAND BY by pressing (prolonged) the MODE button.
When the unit is STAND BY all the users are disabled and the antifreeze function is not activated.
Operation mode selection
When the unit is ON, one of the operation modes can be selected by accessing the “Operation mode” menu.
-
Cooling
COOL
-
Heating
HEAT
-
STANDBY
StdBY
Remote ON/OFF
This function allows remote selection of the STANDBY mode. If the input is activated (contact open) the controller is in STANDBY
mode and the operation mode cannot be modified from keyboard.
The function is available if one of the configurable inputs is configured for this, contact closed = unit ON (display SIW), contact
open = OFF (display
StdBY
).
Remote Cooling-Heating
This function allows remote selection of Cooling or Heating mode. If the input is activated (contact open) the unit is in heating
mode. If the input is not activated (contact closed) the unit is in cooling mode. The operation mode cannot be modified from the
keyboard (but STANDBY mode can be selected).
To enable this function, follow the indications in the section “configurable inputs setting”.
Set point
The set point value in cooling (
COOL
) and heating (
HEAT
) can be set by accessing the “Status \
Sp
” menu. The purpose of the con-
troller is to keep the water temperature at the unit inlet as close as possible to the set value, by activating the compressor accor-
ding to an on-off logic.
Operation in heat pump mode
For all units in heat pump version the parameter
tr01
enables operation in heat pump mode when it assumes value 1. It is pos-
sible set an outside air temperature value (parameter
HP01
) below which operation in heat pump mode is blocked (the supple-
mentary electrical heating elements remain activated in any case, if present).
Antifreeze
The plate-type exchanger is protected by activation of an electrical heating element and activation of the antifreeze alarm, occur-
ring in sequence when the exchanger outlet water temperature reaches dangerous values. The storage tank is protected by the
antifreeze heater (accessory) activated in parallel with the plate-type exchanger heating element.
When the outside air temperature approaches 0°C, if the unit is not working, the pump is activated in any case to prevent exces-
sive cooling of the water in the pipes.
Supplementary electrical heating elements
The parameter
Hi02
enables operation of the electrical elements supplementing the heat pump when it assumes value 1. The
heating elements are activated according to a two-step logic depending on the unit inlet water temperature. When present, the
heating elements also carry out a storage tank antifreeze function.
Climate adjustment
In heating, the parameter
DS00
allows enabling of climate adjustment when it assumes value 1. The heating set point is adjusted
according to the outside air temperature (if the external probe is installed).
To configure this function, follow the indications in the section “configurable inputs setting”.
Modulating speed of the pump
Changing the value of
PI31
or
PI41
is it possible to manually adjust the speed of the pump accordingly to the desired difference of
temperature between water IN and OUT.
Dynamic defrost
The activation limit is modified in a dynamic way according to the outside air temperature (if the external probe is installed).
Power limitation.
With this function, the unit can be forced to operate at 50% maximum power, from a digital output, thus reducing energy con-
sumption.
To enable this function, proceed as indicated in the section “configurable inputs setting”.
Economy function
This function allows the set point to be varied by a certain value from a digital input.
In cooling mode the set point is increased by the value set on tr15 (e.g. going from 9.5°C to 14.5 °C).
In heating mode the set point is decreased by the value set on tr25 (e.g. going from 42°C to 36°C)
To enable this function, proceed as indicated in the section “configurable inputs setting”.
Serial communication
The device is configured for communicating on a serial line using the MODBUS protocol. When connecting the device it must be
assigned an address univocally identifying it among all the devices connected to the same serial line (“
Modbus individual
address
”). This address must be between 1 and 247 and is configurable by means of the parameter
CF30
(see section on serial
communication).
Recording hours of operation
The controller can record the hours of compressor and pump operation. Access the “Status \
Hr
” menu to show the values. The
hours are reset by pressing (prolonged) the SET button, while the hours of operation are displayed.
Power failure
In case of a power failure, when the power is restored the controller will go to the status prior to the power failure. The procedu-
re is cancelled if a defrost is in progress. All timing in progress is cancelled and reinitialised.
Clock
The controller has an internal clock for memorising the date and time of each alarm occurring during unit operation (see “Alarms
history”). The clock can be set by accessing the “Status \
CL
” menu.
ADJUSTMENT AND CONTROL
