2EWPX 173/S/E 6/97 ing
displayed and the “SET” led turns on.
To change the Setpoint use the “UP” and
“SET/DOWN” keys within 5 seconds.
If no operation is performed for more than
10 seconds normal mode is restored.
MANUAL ACTIVATION OF THE
DEFROST CYCLE
The manual activation of the defrost cycle
is performed by holding the “UP” key
pressed for more than 7 seconds (the key
is not enabled during Setpoint or parame-
ters programming). In case the conditions
are not suitable for defrost (e.g. when the
temperature of the evaporator probe ex-
ceeds the defrost end temperature) the
“dFu” (deFrost unable) label is displayed.
Led “DEFROST” blinks during the manual
defrost cycle.
DISPLAYING PROBE VALUES
The instrument provides two input ports
for probes to regulate the temperature and
control defrost.
By pressing and releasing keys “UP” and
“SET/DOWN” simultaneously, the label
“CPr” (Compressor Probe) is displayed; by
pressing and releasing the “SET/DOWN”
key the display shows the value of the reg-
ulation probe. When the “UP” key is
pressed the label “Epr” (Evaporator Probe)
is displayed; by pressing and releasing key
“SET/DOWN” again the display shows the
value of the defrost probe.
KEYBOARD LOCKING
Through a special programming of the
“Loc” parameter, the keyboard can be dis-
abled to prevent undesired operation or
changes in the instrument settings.
When the keyboard is locked only display
(no changes) is allowed both for Setpoint
and all parameters but the “Loc” parame-
ter to allow keyboard unlock. When the
keyboard is locked no manual activation of
the defrost cycle is permitted.
PASSWORD TO ACCESS
PARAMETERS PROGRAMMING
The instrument allows to set an access
password to enter parameters program-
ming mode.
To set (or change) the password enter pa-
rameter “PAS” and input a value from 1 to
15 (when 0 is input the password is dis-
abled). The password is activated when
the parameters programming phase is
quitted.
In case a password is enabled, when ac-
cess to the parameters programming
phase is requested, the “PAS” label is dis-
played. Press the “SET/DOWN” key to en-
ter password setting, use the “UP” and
“SET/DOWN” keys to change the pass-
word. If the password is correct by press-
ing “SET/DOWN” and then “UP”
programming mode shall be entered, oth-
erwise it shall be automatically quitted.
PARAMETERS PROGRAMMING
Parameters programming mode can be
accessed by holding keys “UP” and
“SET/DOWN” pressed for more than 7
seconds.
The first label is displayed and the “SET”
led keeps blinking as long as parameters
programming mode is enabled.
To access other parameters press “UP” or
“SET/DOWN”.
To display the value of the parameter indi-
cated by the label press “UP” and
"SET/DOWN" simultaneously.
To change its value press “UP” or
“SET/DOWN”. The new values are auto-
matically stored when programming mode
is exited (after no key is pressed for some
seconds).
PROGRAMMING THE REAL TIME
EWPX 173/S includes an internal clock to
control defrosts. To display the real set
time press and release the “UP” (clock)
key: the display will alternatively show
hours (preceded by letter “ h ”) and min-
utes (preceded by “ ' ”).
To change the time, press and release the
“UP” (clock) key, then hold the
“SET/DOWN” key pressed for about 7
seconds; when the hours or the minutes
are displayed (press the keys simultane-
ously to skip from one display mode to the
other), use the “UP” and “SET/DOWN”
keys to set the required value.
The new values are automatically stored
exiting the programming mode, after no
key is pressed for about 10 seconds.
EWPX 173/S includes an internal back-up
device which allows time counting also in
case of power failure. The autonomy is
about 5 hours, after which the real time
memory is lost and shall be reprogrammed
(in such case the count restarts from
“h00”-“00'” at power up).
The loss of the memory information is
shown at restart after a power failure only
when the clock option is enabled (see pa-
rameter “dit”) by displaying label “dte” (de-
frost time error) and the room value
alternatively.
PARAMETERS DESCRIPTION
diF: diFferential.
Setpoint intervention differential.
For applications in the field of refrigeration
the differential shall be set to positive val-
ues: the compressor stops when the
Setpoint is reached (according to data de-
tected by the regulation probe) and
restarts when the temperature reaches
Setpoint plus the differential.
LSE: Lower SEt.
Minimum value allowed for Setpoint.
Usually set to the minimum value that can
be measured by the probe.
HSE: Higher SEt.
Maximum value allowed for Setpoint.
dty: defrost type.
Type of defrost.
EL = Electrical defrost;
in = inversion cycle defrost (warm gas).
dit: defrost interval time.
Defrost interval time in hours.
dct: defrost counting type.
Counting mode for the defrost interval.
dF = digifrost Feature (DIGIFROST®
method; only the operation time of the
compressor is counted;
rt = real time (the instrument operation time
is counted);
SC = Stop Compressor (defrost is per-
formed whenever the compressor stops);
Fr = Free (the compressor relay is freed
from defrost functions, thus continuing to
regulate according to the Setpoint).
dt1…dt6: defrost time 1…6.
Parameters to set the time (real) for defrost
starts (accessible only when “dit” is set to
0).
0…23 = real hours; oF = oFF (disabled).
Note: it is not necessary to input parame-
ters’ values (dt1…dt6) in the exact time se-
quence.
doh: defrost offset hour.
Delay time for defrost start; in minutes.
dEt: defrost Endurance time.
Defrost time-out; in minutes.
dSt: defrost Stop temperature.
Temperature causing defrost end.
FSt: Fan Stop temperature.
Fan stop temperature; a value read by the
defrost probe exceeding the set value
causes fans to stop.
Fdt: Fan delay time.
Delay time for fans activation after a de-
frost; in minutes.
dt: drainage time.
Dripping time; in minutes.
dPo: defrost (at) Power-on.
Defrost at power on.
y = yes; n = no.
ddL: defrost display Lock.
Display lock during defrost.
n = no; during defrost the display shows
the value read by the room probe.
y = yes; during defrost the display shows
the last value read before defrost by the
room probe.
Lb = Label (“defrost”); during defrost the
display shows label “dEF” (dEFrost) , indi-
cating defrost is in progress.
Lg = Label (“dégivrage”); during defrost the
display shows the label “dEg”
(“dEgivrage”), indicating defrost in
progress.
NOTE: in case “y”, “Lb” or “Lg” are select-
ed the display will be locked until the
Setpoint temperature is reached in the
room probe.
dFd: defrost Fan disable.
Allows to select or deselect the exclusion
of evaporator fans during defrost.
n = no; y = yes.
Att: Alarm temperature type.
Interpretation mode for parameters “HAL”
and “LAL”.
Ab = absolute;
re = relative (referred to Set).
HAL: High ALarm.
Maximum temperature alarm. When this
