-If is changed to 2 (Automatic), the function is automatically modified to 3 (AUX output to
cycle reversing valve) and the user will not be able to change the value of this function (the is
hidden from the functions menu).
F45 - Closed door time for turning off lamp (0= )
It sets how long the controller waits after the door has been closed, before disconnecting the lamp, which
is automatically switched on when the door is opened. This function only works if =2 or =6
(Digital input operating mode: Door opening) and =2 (AUX output operating mode: AUX output for
lamp).
If , the lamp will always remain on.
If the controller is operating in nighttime mode, the lamp will always remain off (regardless of the value set
in the function).
F46 - Closed door time to activate the nighttime setpoint (0 = )
It sets the time the controller waits after the door has been closed, before activating the nighttime mode.
This function only works if (Digital input operating mode: Door opening).
If , the controller will always remain in daytime mode.
F47 - Minimum time for compressor on
It sets the minimum time the compressor will stay on, that is, the time interval between the last start and the
next stop. It serves to reduce the generation of voltage/current surges in the electrical grid.
F48 - Minimum time for compressor off
It sets the minimum time the compressor will stay off, that is, the time interval between the last stop and the
next start. It serves to reduce the generation of voltage/current surges in the electrical grid.
F49 - Time of compressor on in case of error in sensor S1
F50 - Time of compressor off in case of error in sensor S1
It sets the minimum time the compressor will stay on/off, respectively, if the ambient sensor (sensor S1) is
disconnected or out of the measurement range.
F51 - Intensity of the digital filter applied to the ambient sensor (S1)
It sets the intensity of the digital filter, which has the purpose of increasing the response time of the
controller to a quick change in temperature measured in S1, ie increasing the thermal inertia of the sensor.
The higher the value set in this function, the greater the response time of sensor S1.
A typical application that needs this filter is a freezer for ice cream and frozen products, as when opening
the door, a warm air mass reaches the sensor directly, causing a quick rise in the measured temperature
indication and, many times, unnecessarily triggering the compressor.
F52 - Time for keylock
This function sets the operation of key lock feature. See item 5.13 (Locking/Unlocking of keys) where
there is a complete description of how to perform key locking/unlocking.
F53 - Control functions shutdown
It sets the operating mode of the feature "Control functions shutdown":
It does not allow the shutdown of the control functions: Configured this way, the
instrument disables the functionality of control functions shutdown through the easy access menu.
It allows to turn on/off the control functions only if the keys are unlocked: Configured
this way, the instrument enables the functionality of turning on/off the control functions through the easy
access menu in case the keys are unlocked.
It allows to turn on/off the control functions even if the keys are locked: Configured
this way, the instrument enables the functionality of turning on/off the control functions through the easy
access key, even if the keys are locked.
See item 5.14 (Control functions activation/deactivation) where there is a complete description of how to
perform the activation/deactivation of the control functions.
F54 - Address in RS-485 network
It sets the address of the controller in the communication network RS-485, for it to communicate with the
Sitrad software.
Note: In the same network, there cannot be more than one instrument with the same address.
5 - Operation
5.1 - Parameter visualization
To visualize the controller parameters, access the functions menu. To access it, simultaneously press
keys for 2 seconds, until the message is shown on the display. When this occurs,
release the keys; after they have been released the message will appear on the display.
To access the desired function, use the keys .
After selecting the desired function, press the key (short touch) to visualize the set value. Press the
key again (short touch) to return to the functions menu.
To exit the functions menu and return to normal operation of the controller (temperature indication), press
the key (long touch) until the message appears on the display.
5.2 - Parameter Alteration
To change the controller parameters, access the functions menu. To access it, simultaneously press keys
for 2 seconds, until the message is shown on the display. When this occurs,
release the keys; after they have been released the message will appear on the display.
With the function selected, press the key (short touch). Use the keys to change
the value (access code to modify the parameters). When ready, press to
confirm.
Use the keys to select the function you want to set, then, press the key (short touch) to
visualize the set value.
Use the keys to change the value to be set in the selected function, and when ready, press the
key to save the new value and return to the functions menu.
To exit the functions menu and return to normal operation of the controller (temperature indication), press
the key (long touch) until the message appears on the display.
5.3 - Selection of the unit (ºC/ºF)
To set which temperature measurement unit is the one that the controller will use (°C or °F), access the
function , enter the access code , and confirm this value by pressing the key (short
touch) to return to the functions menu. Press the key (short touch) to select the temperature unit
selection function; when this occurs, the message appears on the display. To enter the function,
press the key (short touch). Use the keys to choose between and
confirm the selection by pressing the key (short touch). After selecting the unit, the message
is displayed and the instrument will return to the function . Every time the unit is changed, the
parameters must be re-configured, as they assume the default values, as described in the table in item
4.2.
[F02] [F44]
[F44]
[,no
[F43] [F43]
[F44]
[F45] = [,no]
[,no]
[F43] = 2 or [F43] = 6
[F46] = [,no]
[,0,]
[,1,]
[,2,]
< and > [Fun]
[F01]
< or >
@
@
@ [---]
< and > [Fun]
[F01]
[F01] @ < or >
[F01] of the [123] @
< or > @
< or >
@
@ [---]
[F01] [231] @
<
[Uni]
@ < or > [,=C] or [,=F]
@ [FAC]
[F01]
5.4 - Process stage, elapsed time and temperature in the
evaporator (S2)
To access this information, press the key (short touch). On the display, the following will
appear: the stage in which the controller is, the time (in minutes) elapsed in this stage, the active
setpoint (daytime or nighttime ) and the temperature in sensor S2
In the case sensor S2 is disconnected, disabled ( ), or if the temperature in S2 is outside the
operating range of the sensor (-50ºC to 75ºC), will appear in place of the temperature in
S2.
Setpoints:
Daytime setpoint
Nighttime setpoint
Stages of the process:
Disabled control functions (Stand by)
Initial delay (delay at start of the instrument)
Fan-delay (delay for return of the fan)
Pre-defrost (only if F10 = 1)
Defrost
Drainage
>
[SP1] [SP2] [T-2].
[Off]
[Er2]
[SP1]
[SP2]
[---]
[DEL]
[FAN]
[REF]or [hot]
[pre]
[def]
[dre]
Refrigeration /Heating
Heating
Defrost
Condenser
Refrigeration
Pré-Defrost
Fan-Delay Drainage
Defrost
Evaporator
5.5 - Condition for starting defrost
5.5.1 - If [F02]=0 (Controller operating mode: Refrigeration)
The function [F11] determines whether the defrost start will be by time or temperature.
[F11]=0: The defrost start will occur after the time set in [F12] elapses.
[F11]=1: When the evaporator temperature reaches the value set in [F15], the pre-defrost
period count ([F16]) is triggered, if this time has been set. After that time has elapsed, if the
temperature in sensor S2 remains below the specified temperature in [F15] the defrost start will
occur. If the temperature increases above the specified value in [F15] , the controller returns to
the stage of refrigeration.
5.5.2 - If [F02]=1 (Controller operating mode: Heating)
Defrost (heating mode) will occur after the system runs in heating mode for the time specified in
function [F13] . To disable defrost (heating mode), just set the function [F21] with value 0.
5.5.3 - If[F02] =2 (Controller operating mode: Automatic)
When the controller is set to automatic, it can operate refrigerating or heating the atmosphere. In
case the controller is refrigerating the environment, it will respect the conditions for defrost start
(refrigeration mode). If the controller stops refrigerating the environment and starts to heat it, the
times relative to the functions [F12] (interval between defrosts (Refrigeration)) and [F14]
(Maximum time in refrigeration) are restarted.
In case the controller is heating the environment, it will respect the conditions for defrost start
(heating mode). If the controller stops heating the environment to start refrigerating it, the time
relative to the function[F13] (Interval between defrosts (Heating)) is restarted.
5.6 - Manual defrost (via easy access key or via Sitrad)
To perform a manual defrost, regardless of the programming, press and hold the @ key for 10
seconds, until the message [def][,On] appears on the display.
If the controller is in defrost, and has been started manually, by pressing the @ key again for
10s, defrost will be terminated with the message [def][Off] and at the same time it will be
recorded in function "F19 – Evaporator temperature (S2) to end defrost" the temperature of
sensor S2, followed by the messages [f19][t-2] and the temperature of sensor S2.
The temperature of sensor S2 will not be recorded in F19 if the interval between the start and end
of manual defrost is less than 2 minutes, then appearing [f19][OFF]. If the controller is in
defrost (initiated by time/temperature) and it is necessary to interrupt it, press the key @ until
the indication [def][Off] appears on the display.
5.6.1- If the controller is heating the environment ([F02]=1
or [F02]=2).
To perform a manual defrost, regardless of the programming, press and hold the @ key for 10
seconds until the message [def] is shown on the controller display, then release the key, and
finally the message [,On] is shown indicating the start of defrost.
The controller will remain in defrost (heating mode) for the period specified in the function in
[F21](Duration of defrost (Heating)), or if the user manually interrupts the defrost (heating
mode).
If the controller is in defrost (initiated manually or by time) and the user wants to interrupt it, press
the @ key for 10 seconds until the message [def] is shown on the display, then release
the key, and finally the message [Off] is shown indicating the end of defrost.
5.7- How to determine the end of defrost (Refrigeration) by
temperature
a)Set the following functions with maximum values:
-[F12]=999 (Interval between defrosts (Refrigeration))
-[F19=75 (Evaporator temperature for end of defrost (Refrigeration))
-[F20]=90 (Maximum duration of defrost (Refrigeration))
b) Wait until a layer of ice forms in the evaporator.
c) Perform a manual defrost (refrigeration mode) manually, by pressing the @ key for 10
seconds until the message [DEF] is shown on the display, then release the key, and finally the
message [,On] is shown indicating the start of defrost.
d) Follow the melting.
e) Wait until all of the ice in the evaporator has melted (defrost terminated).
f) Press the @ key for 10 seconds until the message [DEF] is shown on the display, then
release the key, and finally the message [Off] is shown indicating the end of defrost. At that
moment the temperature measured in sensor S2 is recorded in function [F19] (Evaporator
temperature (S2) to end defrost). If the operation has been executed successfully, the message
[F19][t-2][00.0] (temperature of sensor S2) will be shown on the display.
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