plug-in
Cod. +030221881 rel. 1.5 - 26/10/10
21
/4: display control or food storage probe
For instruments with two probes (S, Y, C), this parameter selects whether to display the temperature of the control probe (ambient
probe) or the second probe, which in this case is used only to display the temperature of the food. The use of the second probe for
this purpose means that it can no longer be used to control defrosting; the corresponding parameters must be modified as a
consequence. The parameter /4 only selects the value to be displayed, all the other display and control modes remain unchanged.
In the versions with just one probe (ambient), the parameter, when present, must always be zero (0). Def.: 0, display ambient probe.
Available on models Y, C and S with two probes.
Warning: the S models with two probes have been designed only to use the second probe for the measurement and display of the
food storage temperature (Food Probe). To manage the second probe, these models are in fact programmed as Y models, with all
the corresponding parameters; it is clear that they must be set so as defrosting is not enabled, or, if necessary, only timed defrost
(d0=2, dI=0, dt=-50), furthermore, if the second probe is not used, it must be disabled (/4=0 and d0=2), to avoid the signal E1
(probe alarm).
/5: °C or °F selection
Defines the unit of measure used for the control and the display.
0 = degrees centigrade, 1 = degrees Fahrenheit.
Warning: when changing from one unit of measure to the other, all the values of the temperature parameters must be modified in
the new unit of measure.
Def.=0, operation in degrees centigrade. Available on all models.
4.5 r = temperature control parameters
control parameters type min max uom def
rd
control differential (0= 0.5 °C) F 0 +19 °C/°F 2
r1
minimum set allowed C -50
r2
°C/°F -50
r2
maximum set allowed C
r1
+127 °C/°F 60
r3
enable alarm ED for models Y, X, C C 0 1 flag 0
r4
Automatic variation of the Set-Point for
night-time operation
C -20 20 °C/°F 0
rL
direct/reverse operating mode (note: only
valid for models S*A)
C 0 1 flag 0
Tab. 4.4.1
rd: control delta
Sets the value of the differential, or hysteresis, used in the temperature control. A narrow, that is numerically small differential,
guarantees an ambient temperature which stays close to the set point, yet with frequent activation and deactivation of the main
actuator (normally the compressor). The life of the compressor can still be protected by suitably setting the parameters which limit
the number of activations per hour and the minimum off time (see C parameters).
In all the refrigeration instruments the differential is set to the right of the set point, as indicated in the figure (DIRECT operation):
Fig. 4.5.1
Def.: rd=2
Available on all models
r1: minimum SET allowed
Determines the minimum value which can be set for the set point. This parameter prevents the user from setting the set point lower
than the value indicated by r1. Def.: -50
r2: maximum SET allowed
Determines the maximum value which can be set for the set point. This parameter prevents the user from setting the set point
higher than the value indicated by r2. Def.: +60
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