F21 - Maximum time for fan return after draining (fan-delay)
F22 - Fan on with compressor off
F23 - Fan stop for high temperature in evaporator
F24 - Hysteresis for fan-delay (after stopping for high temperature in evaporator)
F25 - Low temperature alarm (S1)
F26 - Alarm hysteresis of low ambient temperature
F27 - High temperature alarm (S1)
F28 - Alarm hysteresis of high temperature
F29 - Inhibition time of alarm when the instrument is powered on
F30 - Inhibition time of alarm after draining
F31 - Digital input operating mode
F32 - Time for inhibiting the open door alarm
F33 - Time for collecting the defrost gas
F34 - Delay when the instrument is powered on
F35 - Minimum time of compressor turned on
F36 - Minimum time of compressor turned off
F37 - Compressor status with detached ambient sensor (S1)
ambient
(S )
F39 - Network equipment address RS - 485
For security, if the evaporator temperature does not reach the adjusted value in F20 or the S2 sensor is
detached, the fan-delay will happen after passed the adjusted time in this function.
During refrigeration, the fan can be depend of the compressor status.
”0” = The fan keeps turned on while compressor is turned on (this alternative, in some cases,
Possibilities a great economy of electrical energy).
”1” = The fan keeps turned on during all refrigeration cycle.
This function cycles the evaporator fan until that ambient temperature approaches of the temperature
desired in the refrigerating installation project. This preventing high temperature and suction pressures
that can damage the compressor. If the temperature in evaporator pass the adjusted value, the fan is
turned off, turning on again with a configurable hysteresis in F24.
It allows to determine the difference of temperature to fan-delay had to a stop for temperature above
desired in evaporator.
If the ambient temperature (sensor S1) decreases above this point during refrigeration, this will be
signalized through the message
on display and the output (NO/NC) of alarm will be turned on.
It is the difference of temperature to turn off the alarm output for low ambient temperature.
If the ambient temperature (sensor) reaches this point during the refrigeration, this will be signalized
through the message
on display and the output (NO/NC) of alarm will be turn on.
It is the temperature to turn off the alarm output for high ambient temperature.
During this time the alarm is kept turned off waiting that the system starts to working.
This function serves to inhibit the alarm during a period after draining, because it is normal an elevation of
the temperature proceeding of the defrost.
The digital input can be configured to operate as follows:
0=none;
1=defrost synchronization;
2=open door alarm,
3=nighttime setpoint.
During this time the door open alarm is kept off.
After starting the defrost the controller will keep only the fan on for this time to use the remaining energy of
the gas.
When the instrument is turned on, it can keep a time with its control disabled, delaying the process initial.
During this time it functions only as temperature indicator. It serves to prevent demand peaks of electrical
energy, in case of lack or return of the same, when a lot of equipments are connected in the same line. For
this, adjust different times for each equipment. This delay can be of compressor or defrost (when exists
defrost on start).
It is the time that the compressor will keep turned on, it means, the time period between the last started and
the next stopped.
It is the minimum time that the compressor will keep turned off, it means, the time period between the last
stopped and the next started. It serves to alliviate the pressure and to increase the useful life of the
compressor.
If the ambient sensor (S1) is detached or out specified range, the compressor assumes the configured
status in this function.
For counters that storage fruits it is better that the compressor keeps turned off, but in counters
that storage meats it is better that the compressor keeps turned on.
Equipment's network address for communicating with Sitrad software.
Note: One network must not have different equipment with the same address.
Exemple:
®
.
F38 - Intensity of the digital filter applied to the
sensor
1
This filter aims at simulating an increase of environment sensor (S1) mass, thus increasing its response
time (thermal inertia). The larger the value adjusted in this function, the longest the response time of
sensor S1.
A typical application requiring this filter is the freezer for ice cream or frozen goods, because when the door
is opened a hot air mass reaches the sensor directly, causing a quick rise in the indication of the measured
temperature, causing the compressor to be activated unnecessarily many times.
5.4 - Initial defrost condition
The function “F08” determines if the start of the defrost will be for time or temperature.
The start of defrost will happen after elapsed the configured time in
.
When the temperature in the evaporator reaches the configured value in
, the
count of pre-defrost period will start (F12). After elapsed this time, if the temperature keeps low the
defrost will start. If the temperature increases, the controller returns to refrigeration stage.
F08 = 0
F09
F08 = 1
F11
5.5 - How to determine the end defrost for temperature
a)
b)
c)
Adjust the follow functions with maximum values:
- Interval between defrosts (F09 = 999 min)
- Evaporator temperature for end defrost (F14 = 75 ºC)
- Defrost maximum duration (F15 = 90 min)
Wait until an ice layer to be created on the evaporator.
Do a manual defrost, pressing
for 4 seconds, until appear
.
d)
e)
F)
g)
h)
COMP:
FANS:
DEFR:
ALRM:
Observe the melting process.
Wait until melt all defrost on evaporator to consider the defrost finalized.
Check the temperature in evaporator read by the sensor S2 at this moment, pressing
and copy
this value to the function F14 - Evaporator temperature (S2) for end defrost.
As security, adjust again the function F15 - Maximum duration of defrost, that depends of the defrost
type.
Now adjust the function F09 -Interval between defrosts as desired value.
To do a manual defrost, regardless of the programming, keep pressed
for 4 seconds, until appears
the indication
.
If the instrument is in defrost and you want to finish it, follow the above instructions, until appears the
indication
.
The leds indicate the control outputs status:
Compressor or solenoid of liquid gas
Evaporator fans
Defrost (resistances or hot gas)
Alarm output
Exemple: Electrical defrost (resistance) = 45 minutes as maximum
Defrost for hot gas = 20 minutes as maximum
5.6 - Manual defrost
5.7 - Indicators and Alarms
Detached ambient sensor or temperature (S1) out the range
Detached evaporator sensor or temperature (S2) out the range
Low ambient temperature alarm
High ambient temperature alarm
Always that the defrost is finished by time and not for temperature a point located on right inferior
side of display will be blinking until the next defrost, indicating that:
- The interval between defrost is too long.
- There are burned resistances
- The hot gas is not circulating
- There is an inoperative fan
- The adjusted time for maximum duration of defrost is short.
Invalid configuration parameters.
- In this situation the outputs will be turned off.
- Check which parameter have invalid information and correct it to return to normal operation.
4.3.1 - Unit selection (ºC/ºF)
5. OPERATION
5.1 - Parameters visualization
To determine the unit that the instrument will work, access the function “F01” with the access cod 231 and
confirm with the key
. Press the key
.
will appear. Press
than use
or
to choose
between
or
and confirm with
. After select the unit
will appear and the instrument
returns to the function “F01”. Every time that the unit is changed, the parameters must be configurated again,
because they assume the standard values (item 4.2).
Press at the same time the keys
and
for 2 seconds until appear
, releasing them after that.
Soon, appears
.
Use the keys
and
to access the desired function.
After select the function, press
(short touch) to visualize the configured value.
Press again
(short touch) to return the functions menu.
To reset the menu and return to normal operation (temperature indication), press
until appear
.
a)
b)
c)
d)
e)
SET
SET
SET
SET
SET
SET
5.2 - Parameters alteration
a)
b)
c)
d)
e)
Access the function F01 pressing at the same time
and
for 2 seconds until appear
,
releasing then after that. Soon will appear
, and then press
(short touch).
Use
and
to enter the access code (123), and then press
.
Select the desired function and visualize the configured value, like explained the itens“5.1-b” and
“5.1-c”.
Use
and
to change the value and then press
to record the configured value and return
to the functions menu.
To reset the menu and return to normal operation (temperature indication), press
until appear
.
Press
.The stage of the process will appear, the elapsed time (in minutes) and evaporator
temperature (S2).
In case of detached sensor or temperature out specified range will appear
.
Process stages:
Initial delay (delay to start the control)
Fan-delay (delay to fan return)
Refrigeration
Pre-defrost (only if F08 = 1)
Defrost
Draining
5.3 - Process stage, elapsed time and evaporator temperature (S2)
SET
SET
SET
SET
FAN-DELAY
REFRIGERATION
DEFROST
DRAINING
PRE-DEFROST
