RDZ PDC FLOOR 12T, Installation Manual

Page: 36 / 64

EN
36
2 .16 Auxiliary heater management (resistor or back-up boiler)
This function, displayed by the tile on the touchscreen in-
terface and by the flashing of the LED on the emergency
interface as well as an automatic intervention in case of external
condenser in heating and hot water modes, includes three dif-
ferent algorithms for activating the K1 relay which controls the
auxiliary heater (in the units with backup resistor only) and the
backup boiler contact (terminals 15-16), which are identical for
the hot water and heating functions, and which operate inde-
pendently from one another:
– if the water detected by the adjustment input sensor (T1 in
heating mode or T3 in hot water mode) drops and remains
under a value equal to double the set hysteresis for longer
than 20 minutes*, the controller activates relay K1 in integra-
tion, switching* or exclusion entirely* (with CAL function) the
head pump.
Risc.
ausiliario
PDC
Setpoint
Risc.
ausiliario
PDC
Set- _hY
Set -2·_hY
INTEGRAZIONE
COMMUTAZIONE
T>hto
T<hto T>hto
T.acqua
Tempo
– if a setpoint is set higher than 50°C* the controller turns the
heat pump off and activates the K1 relay When this function
is active, the heat pump and the auxiliary heater will never
operate at the same time.
Risc.
ausiliario
PDC
Setpoint
hiS-_hY hiS Set-_hY T.acqua
– if the external temperature measured by the T4 sensor goes
below -15°C*, the controller activates the K1 relay in switch-
ing with the heat pump
* This adjustment can be changed by the Technical Assistance
Service.
A
hoS for hot water / hor for heating
T.aria est.
Tempo
A
A + ihY
COMMUTAZIONE
PDC
Risc.
ausiliario
Master switch Q2 is provided in units provided with back-up re-
sistor to enable the components and protect them electrically.
The installer may connect the three stages (2, 4 or 6kW) accord-
ing to needs and the electric power available to users.
Refer to the power draw table for the various conditions and
add the power of the resistors connected in order to deter-
mine the size of the electrical system.
Electrical draw increases by 9A for each connected stage in sin-
gle-phase units.
In three-phase units, electrical draw increases by 9A on each
phase connected to the resistor. In case of connection of only
one or two stages, there will be 9A draw also on neutral.
Adequately size the electrical connector of the neutral.
A manually rearmed thermostat sensor TS calibrated to 80°C is
present in units with resistor inside the collector to disconnect
power from relay K1 if the threshold is exceeded.
2 .16 .1 Disabling hot water, cooling or heating function
The appliance is designed to provide hot water (high priority),
cooling and heating, but the Technical Service technician can
easily deactivate the functions by operating on the controller
configuration parameters SCE, ECE and ICE.
In this case, the respective tile on the touch screen interface will
disappear.
If the hot water function is disabled, the emergency interface
will display the water temperature in the hydraulic separator
(T1).