RDZ PDC FLOOR 12T, Installation Manual

Page: 40 / 64

EN
40
3 .2 .1 User interface
The interface normally displays the temperature of the water in
the hot water boiler and allows to perform all of the operations
related to the use of the instrument and in particular to:
Select the cooling/heating operation mode
Display and rearm the alarm situations
Check the status of the resources (setpoint, temperatures,
hours of operation of the external unit and the auxiliary heat-
er)
Apart from what is described in this chapter, there are many oth-
er settings possible which imply an in depth knowledge of the
device and system to which it is connected in order to prevent
serious damage to the device.
It is equipped with a three-digit display for showing tempera-
tures, parameters and alarms, six LEDs indicating decimal point
(between the second and third digit, only for the measurements
below 20°C), cooling/heating state, hot water request, external
unit ON and alarm signalling.
Heating control on LED
Cooling control on LED
Hot water production on LED (blinking with an-
ti-Legionella function on)
Outlet ON/OFF LED (blinking with back-up resis-
tor on)
Based on the readings of the return temperature sensor (T1)
and the hot water sensor (T3, displayed by default) sensors,
the setpoints, the external temperature measured by sensor
T4 and input state, the electronic board makes all the nec-
essary temperature adjustments to satisfy the heating/cool-
ing or not water production needs by operating on the relays
and (by means of PLL logic) on the external condenser signal.
Hot water production, which has higher priority over the other
adjustments, sets heat pump operation of the external unit until
the desired setpoint is reached (default setting 45°C, adjustable
between 30 and 50°C) and simultaneously activates the three-
way valve in order to divert the hot water produced in the boiler.
This adjustment is indicated by the switching on of the appro-
priate LED .
This function can be disabled by the Technical Service and in this
case the system sensor (T1) will appear automatically on the dis-
play, and the hot water sensor (T3) will be ignored.
The cooling function enabled by the closing of the ON/OFF in-
put and of the thermostatic contact TA and selected by pressing
button , sets the production of cold water to exploit the in-
verter adjustment modulation to the maximum by means of a
PLL logic which acts according to the actual different between
the temperature measured by the probe on the system water
return and the setpoint SET set to 12 °C (adjustable between 10
and 20 °C).
This adjustment is indicated by the switching on of the appro-
priate LED .
The heating function enabled by the specific switch on the con-
trol, by the closing of the ON/OFF input and of the thermostatic
contact TA and selected by pressing button , by means of
a double PLL logic which takes into account both the actual dif-
ference between the temperature detected by the sensor on the
system water return and the setpoint SEt set to 40 °C (adjustable
from 20 to 55 °C) and according to the external air temperature
(climatic control), operates so as to make the external unit work
in heat pump mode by exploiting to the maximum the modu-
lating algorithm and possibly reactivating the auxiliary heater
according to the adjustments 2.16Auxiliary heater management
(resistor or back-up boiler)p. 34.
This adjustment is indicated by the switching on of the appro-
priate LED .
The external condenser is enabled whenever a thermostatic re-
quest is received in accordance with the integration and switch-
ing settings described in paragraph 2.16Auxiliary heater man-
agement (resistor or back-up boiler)p. 34 is disabled in case of
alarm and indicated by the lighting of the LED .
Settings are mutually excluding and the setting remains
stored also in case of blackout.
3 .2 .2 Access to user menu, displaying and modifying
information
Press and immediately release ;
Use buttons or to select the data will be viewed
from the INFO MENU table.
Hold button to view the value.
To modify the active value setpoint SEt or the hot water func-
tion SAn hold press and use buttons or to
set the required value (within the minimum SL and maximum
SH limit).
When the button is released, the new value is stored
and the next parameter is shown.
To exit from the menu, press or wait for 10 seconds.
3 .2 .3 User menu
The following information is available from the menu which can
be accessed by pressing in sequence:
T1 System sensor temperature.
SEt Active function setpoint (cooling or heating) **.
T2 Heat exchanger output sensor temperature.
SAn Hot water function setpoint.
T3 Hot water sensor temperature (default view).
T4 External air sensor temperature.
Mhr Thousand of hours of resistor operation.
Phr Hours of resistor operation.
MhC Thousands of hours of heat pump operation.
PhC Hours of heat pump operation.
Loc * Keypad state (locked).
* Select YES to lock keypad or NO to unlock it.
** Subject to climatic control.