Stulz COSMOTEC CVE Serie Manual De Uso Y Mantenimiento página 24

Meaning of Led
On display there are several symbols. Here below their meanings:
LED MODE MEANING
Lighted Compressor On
Flashing Delay against nearer starts
Lighted Evaporator fan On
Flashing Delay starting evaporator fan in progress
Lighted Alarm is present
Lighted SEM in progress
Flashing SEM2 in progress
Lighted Heater On
Flashing Delay starting heater in progress
°C/°F Lighted Unit of measurement
°C/°F Flashing Programming
Lighted Sequencing: MASTER mode
Flashing Sequencing: SLAVE mode
Block and unblock keypad
To block keypad to keep pressed key UP and key DOWN for some
seconds, until appearing flashing message "POF" . So the keypad is
blocked and it is possible only to display set point, max and min
temperature. To unblock keypad to keep pressed key UP and key
DOWN until appearing flashing message "PON".
Display main screen and access to menu
Visualization rapid menu
Controller allows visualization of some useful parameters quickly for
some regolations. The parameter list is: value probe B1, value probe
B2, value probe B3, value probe B4, value analogic output uscita
analogica AO1, value analogic output AO2.
Using of visualization rapid menu
To acces menu:
1. Press key UP, release it, first label of menu will be display: dP1
(display probe 1)
2. To show whole list, press key UP or key DOWN.
3. Labels of list that appear are : dP1
(Probe B2), dP3 (Probe B3), dP4
Analogic output), AO2
4. To display value of parameter press key SET.
5. To return parameter list press key SET.
About probes B1,B2,B3, it will be possible to display, value °C or °F
of temperature, falshing label "Err" means that probe is in error,
label " nu" (not used) means that probe is not enabled (B2,B3 = no).
About probe B4 it will be possible to display pressure value in or PSI,
falshing label "Err" means that probe is in error, label " nu" (not
used) means that probe is not enabled (B4 = no).
About analogic outputs AO1, AO2, it will be possible to display
percentage value from 0 to 100, it means the output value of
resource, label " nu" (not used) means that analogic output is not
enabled (AO1/AO2 = nu).
(Probe B1),
(Probe B4), AO1
(2° Analogic output)
NOTE: data
configuration/programming of unit
State of unit
ON/OFF: state ON/OFF is active with key on display/keypad. Key ON
/ OFF operates only if key ON / OFF is enabled, changing state of
unit from ON to OFF and e vice versa. Relay of alarm remains on
normal working state.
STAND-BY: state STAND-BY is connected to digital input Remote
Enable. In case contact is open, controller doens't make no
regulation and switch off all devices that are connected to analogic
and digital outputs. State OFF is priority than state STAND-BY. Relay
of alarm remains on normal working
Working logic
Cooling
Relay K1 will be open when internal temperature is smaller or equal
than set point (SEt) for cooling, it will be closed when internal
temperature is higher or equal than set point for cooling +
hysteresis cooling (HY). Before that compressor can start following
conditions have to be satsfied: minimum time switching off is
higher or equal that corrisponding value of parameter minimum
time switching off for compressor (AC), or time since previos
swiching on is higher or equal to corresponding value of parameter
minimum time between two starting for compressor (OiC).
Moreover cooling will be switch off when: opening digital input
Remote enable, state unit OFF, (if compressor is on it will stop after
minimum time switching on compressor), alarms that schedule its
switching off (in this case minimum time switching off for
compressor, minimum time between two starting for compressor
are not considered).
Heating
Start of the heater is enabled only if heating mode is enabled by
programming. Relay will be open when internal temperature is
higher or equal set point di heating (SEH), it will be closed when
internal temperature is smaller or equal set point heating –
hysteresis heating(HYH). Moreover heater will be switch off when:
opening digital input Remote enable, state unit OFF, alarms that
schedule its switching off. In case heater is on it will switch
Evaporator fan management
dP2
(1°
Fan always ON
Fan will be off only following cases: opening digital input Remote
enable, state unit OFF, (in this case fan stops after delay time to
swiching off and only if compressor is off), alarms that schedule its
switching off (in this case dealy time to switching off is not
considered, but compressor has to be off).
Smart Energy Management
heating mode (with ACARES)
Fan starts only when it is enabled cooling or heating mode. After
heating or cooling cycle it is necessary to wait delay time to
switching off before to disactive fan. Moreover fan will be off only
following cases: opening digital input Remote enable, state unit OFF,
(in this case fan stop after delay time to swiching off and only if
24
could be showed in
state.
2 2
(SEM ) – Fan work on cooling and
CVE-CVO
according to
off.