Defrost Management (Dfr Branch); Alarms - Riello NexPro Plus Installation And Maintenance Manual

STARTING AND USE
The factory settings of the parameters are shown in the follow-
ing example:
100
F04
90
80
75
70
60
50
F03
40
8 10 12 14 16 18 20 22 24 26
If the water temperature is lower than F07 parameter (15°C), the
fan runs at max speed F04.
If the water temperature is higher or same as F07 parameter
(15°C), 3 cases are possible:
1st Case
Tair <= [F05-F06] Fan at max speed or F04
2nd Case
[F05-F06] < Tair < [F05] Fan at proportional speed V%
3rd Case
Tair > [F05] Fan at minimal speed F03

3 .22 Defrost management (dFr branch)

It allows to use the unit also with air temperature of about 0°C,
preventing the formation of ice on the evaporating coil surface.
It is adjusted by a smart algorithm and is performed through hot
gas injection (d01=1). Moreover, it can be carried out per time or
per temperature according to the parameter value (d02).
The defrost is enabled only for heat pump operation.
The activation/deactivation of defrost is a based on the value
detected by probe S03 and on a series of parameters described
in dFr branch.
The defrost activation occurs if probe S03 detects a temperature
lower than the intervention threshold (d03), for a preset interval
time (d05). This interval is displayed through the flashing of LED
L5, whereas for the whole duration of the cycle dFr symbol is
displayed, alternated with the current water temperature.
Similarly, the defrost deactivation occurs if probe S03 detects a
temperature higher than the defrost end threshold (d04) or pos-
sibly for a maximum time (d07).
NOTE: in the navigation diagram, the instantaneous value of
such temperature can be displayed near parameter S03 .
27
External air
30
(S02)
28 32
F06
22

3 .23 Alarms

ALARM E01 - HIGH PRESSURE
The alarm shuts off the unit and the display shows the message
E01. The reset is automatic until the number of interventions/
hour is equal to the value set in the parameter AL7, in which case
it becomes manual. Manual reset by keyboard pressing the
[SET] key once the cause of alarm has fixed.
ALARM E03 - PROBE S01 FAILURE
It is active if the sensor S01 (sonda acqua serbatoio) is short cir-
cuited or disconnected. The alarm shuts off the unit and the
display shows the message E03.
ALARM E04 - PROBE S02 FAILURE
It is active if the sensor So2 (Outdoor air temperature) is short-cir-
cuited or disconnected. The alarm shuts off the unit and the dis-
play shows the message E04.
Machine operation can be forced to MANUAL mode by setting
H29=0 (i.e. by disabling probe S02, in order to remove the alarm
condition) and then by pressing
electrical heating element only; obviously, in this condition the
AUTOMATIC mode is inhibited.
ALARM E05 - HIGH TEMPERATURE
The reset is automatic.
It is activated if the sensor S1 assumes values higher than the
parameter AL5 for a time longer than the parameter AL6.
The alarm shuts off the unit and the display shows the message
E05.
ALARM E06 - PROBE S03 FAILURE
It is active if probe S03 (evaporator inlet probe) is short circuited
or interrupted and if the following conditions are true:
− defrost enabled (d01= 1, d01=2)
− electronic expansion valve enabled (U00=1).
The intervention implicates the machine switching off and the
displaying of label E06.
ALARM E07 - PROBE S04 FAILURE
It is active if probe S04 (evaporator outlet probe) is short circuited
or interrupted and if the electronic expansion valve is enabled
(U00=1). The intervention implicates the machine switching off
and the displaying of label E07.
Code Description
E01 Refrigerant high pressure alarm
E02 Not available
E03 Alarm Probe S01 (water) broken or disconnected
E04 Alarm Probe S02 (air) broken or disconnected
E05 Water high temperature alarm
Alarm Probe S03 (evaporator inlet) broken or discon-
E06
nected
Alarm Probe S04 (evaporator outlet) broken or dis-
E07
connected
9
From a state of ALARM, holding down the
enter the navigation diagram.
9
If the alarms described repeatedly trigger, switch off the
machine and contact an authorized Technical Support Ser-
vice, indicating the identification data of the unit contained
in the relevant plate.
[FUNCTION] key to activate the
[SET], key you