RDZ PDC FLOOR 12T, Installation Manual

Page: 41 / 64

EN
41
3 .2 .4 Standby
Standby state can be set using the touch screen interface or by
opening the ON/OFF selection contact connected to terminals
7 – 8. It deactivates all adjustments and the OFF indication is
shown on the display.
While in standby, the device runs an antifreeze cycle which
activates the circulation pump based on the ALO threshold
and on the readings of sensors T2 and T3; operation is sig-
nalled on the display by the alternating OFF and ALO signs.
3 .2 .5 Keypad lock
Locking the keys prevents undesired and potentially damaging
operations which may occur whenever the regulator is operat-
ing in a public environment.
To activate the function set Loc=YES in the INFO menu; to re-
turn to the normal function reprogram Loc=no.
While the keypad is locked, (Loc in menu INFO on Yes) it is possi-
ble to change the setpoints (within the minimum and maximum
limits allowed), but it is not possible to put the device in standby,
reset the manual reset alarms, make the cooling/heating selec-
tion or access the configuration menu.
3 .2 .6 Displays
In normal operation mode, the display shows the water temper-
ature as measured by the T3 sensor positioned in the hot water
tank, or the following messages:
FL Intervention of the flow meter connected to DI1
Lo Low temperature alarm (5°C) detected by sensor
T2 with controller on
ALO Low temperature alarm (5°C) detected by sen-
sors T2 or T3 with controller in standby
PDC External condenser alarm
E1 Sensor T1 fault
E2 Sensor T2 fault
E3 Sensor T3 fault
E4 Sensor T4 fault
ALR One-hour tripping of one of the alarms for >ASM
LEG Anti-Legionella cycle ended incorrectly (signal-
ling only)
OFF Regulator in standby
hi High temperature alarm (80°C) detected by sen-
sors T2 or T3
CAL Exclusive operation of the auxiliary heater with
circulation pump off.
* Signalling only
3 .2 .7 Alarm
Any alarm signal is accompanied by the locking of the outputs,
by the lighting of the LED and the sounding of the buzzer (to
stop the latter, simply press any key on the controller) and is
subject to the maximum time frequency check (three alarms per
hour).
Below this value the alarm will be automatically reset, while, if
the set value is exceeded, rearming will be manual (in this case,
the alarms specific sign shall alternate with the ALr sign that
means that the device is locked).
LED goes off when the event that triggered the alarm ceases;
only then will it be possible to reset the alarm, by pressing
for 5 seconds.
The opening of the DI1 inlet, connected to the differential
pressure gauge that acts as a flow meter, makes all the outputs
turn off immediately and, after 1 minute, when the pump is kept
on to check once again that the flow meter has closed, it triggers
the ALr manual reset alarm signal which alternates with the FL
sign, and turns the pump off permanently.
The low temperature (5°C antifreeze signalled on the display
by the Lo prompt) and high temperature (80° hi on the display)
alarms are managed by means of the heat exchanger output
temperature sensor T2 positioned at the plate heat exchanger
outlet and the hot water tank sensor T3. The low temperature
alarm is monitored also when the controller is in standby, and
triggers the oFF and ALo prompts alternatively and the starting
of the circulation pump. The alarm is reset when the water tem-
perature goes up again to above the 5°C + 3°C hysteresis thresh-
old.
Alarm PdC appears on the display in case of malfunctioning of
the external condenser.
If the anti-Legionella cycle ends because the timeout has ex-
pired, only the LEG prompt is displayed.
Indications E1, E2, E3 and E4 may appear in case of failure or in-
correct measurement of the three temperature sensors.
See paragraph 3.9 for causes and remedies of the alarms. p.44
3 .3 Setting and general start-up
3 .3 .1 Preparation for first start-up
The first start-up of the air-water heat pump must be performed
by the Technical Service.
Before starting-up the air-water heat pumps ensure that:
– All the safety conditions have been respected.
– The air-water heat pump has been appropriately fixed to the
support surface.
– The minimum clearances has been observed.
– The hydraulic connections have been carried out in accord-
ance with the instruction manual.
– The hydraulic system has been filled and vented of any air.
– The hydraulic circuit interception valves are open.
– The hydrometer pressure is between 1 and 2 bar.
– The electrical connections have been made correctly
– The voltage is within a 10% tolerance of the nominal voltage
of the unit.