Full Gauge Controls TC-920Ri Manual page 2

F13 - Compressor status with detached ambient sensor (S1)
If the room sensor (S1) will be danified or outside the specified range, the compressor assumes the
configured status in this function.
Example: For counters of fruits, it is better to keep the compressor off. In counters of meat it is better to
keep the compressor on.
F14 - Defrost when the instrument is powered on
It makes possible the accomplishment of a defrost at the moment that controller is energized, for
example, in the return of electrical energy (in case of energy lack)
F15 - Evaporator temperature (S2) for end defrost
If the temperature in the evaporator (sensor S2) reaches the adjusted value, the end of defrost will be for
temperature. With this, the defrost process is optimized.
F16 - Maximum duration of defrost (for security)
This function serves to adjust the maximum value of time for defrost. If evaporator temperature does not
reach the configured value in F15 in this period a point will blink in the right down side of display
indicating that end of defrost ocurred for time and not for temperature.
The end of defrost by time (which is not desired) can happen on the following situations:
(F15)
-Adjusted temperature too high;
(F16)
- Maximum time of defrost too short;
- Detached S1 sensor or without contact with evaporator.
F17 - Fan turned on during defrost
It makes possible the fan functioning during defrost.
Example: Natural defrost or by resistances installed outside the evaporator.
F18 - Defrost type
"0" = Electrical defrost (resistances), where the defrost output is active.
"1" = Defrost by hot gas, where compressor and defrost outputs are actives.
F19 - Locked temperature indication (S1) during defrost
This function prevents that room temperature elevation during defrost be visualized, keeping the last
indication before defrost. The indication is released again in the initial of refrigeration cycle, after fan-
delay.
F20 - Draining time (dripping of defrost water)
Necessary time for dripping, it means, for draining the last water drops of evaporator. All the outputs are
kept off. If this stage will not be desired, adjust this time for "zero".
F21 - Evaporator temperature (S2) for fan return after draining (fan-delay)
The fan-delay cycle starts after draining. The refrigeration output (REFR) is active, therefore the
ambient temperature is high, but the fan is actived only after the temperature in evaporator is less than
the adjusted value. This process is necessary to remove the heat that still exists in the evaporator
because of defrost, preventing to transfer this heat to the ambient.
F22 - Maximum time of fan return after draining (fan-delay)
For security, if the temperature in the evaporator does not reach the adjusted value in F21 or sensor S2
is detached, the fan-delay will happen on the adjusted time in this function.
F23 - Fan on with compressor off
During the refrigeration cycle, the fan activation may depends on the compressor status.
"0" = The fan is actived only while the compressor is active. This alternative, in some cases, allows great
economy of electric energy.
"1" = The fan is kept on during all refrigeration cycle.
F24 - Fan stopped for high temperature in evaporator
It has for purpose the cycle of evaporator ventilation until the ambient temperature approaches the
desired temperature in the refrigerating installation project, preventing high temperatures and
pressures that can damage the compressor. If the temperature in evaporator exceed the adjusted value,
the fan is turned off and turned on again with a fixed hysteresis of 2°C below this value.
F25 - Digital input operation mode
The digital input can be configured to operate as follows:
0 - Off
1 - Defrost start signal
2 - Door status monitor
Fg26 - S3 sensor enabling
Select as follows to enable or disable sensor S3
0 - Disabled
1 - Enabled
NOTE: If sensor S3 is out of operation or disabled (F26=0), temperature control is performed by setpoint
SP1.
F27 - Temperature difference (S3 S1) above which the setpoint SP1 is activated
The device operates with setpoint SP1 when the temperature is above the value configured for this
function.
F28 - Temperature difference (S3 S1) below which the setpoint SP2 is activated
The device operates with setpoint SP2 when the temperature is below the value configured for this
function.
5. OPERATION
5.1 - Parameters visualization
a) Press at the same time and for 2 seconds until appear
Soon, appears .
b) Use and to access the desired function.
c) After selecting the function, press SET (short touch) to visualize the configured value.
d ) Press again (short touch) to return the functions menu.
SET
e) To reset the menu and return to normal operation (temperature indication), press
.
5.2 - Parameters configuration
a) Access the function F01 by pressing at the same time
releasing then after that. Soon will appear
b) Use and to enter the access code (123), and then press
c) Select the desired function and visualize the configured value (see itens
d) Use and to change the value and then press
to the functions menu.
e) To reset the menu and return to normal operation (temperature indication), press
.
5.3 - Process stage, elapsed tim, sensors S2 and S3 temperature
and differential S3-S1
Press . The stage of the process will appear, the elapsed time (in minutes), the evaporator
temperature (S2), sensor S3 temperature and the differential S3-S1.
Process stages: Initial delay (delay to start the control)
Fan-delay (delay to fan return)
Refrigeration
Defrost
Draining
Indication released
FAN-DELAY REFRIGERATION
F22 F10
5.4 - Manual defrost
To do a manual defrost, regardless of the programming, keep pressed
indication .
If the instrument is in defrost and you want to finish it, follow the above instructions, until appears the
indication .
5.5 - How to determine the end defrost by temperature
a) Adjust the follow functions with maximum values:
- Refrigeration time (F10 = 999 min)
- Evaporator temperature for end defrost (F15 = 75 ºC)
- Maximum duration of defrost (F16 = 90 min)
b) Wait until an ice layer to be created on the evaporator
c) Do a manual defrost, pressing for 4 seconds, until appear
d) Observe the melting process.
e) Wait until melt all ice layer on the evaporator to consider the defrost finished.
f) Check the evaporator temperature read by the sensor S2 at this moment, pressing the key
and copy this value to the function F15 - Evaporator temperature (S2) for end defrost.
g) As security, adjust again the function F16 -
Exemple: Electrical defrost (resistance) =45 minutes as maximum
Defrost for by hot gas = 20 minutes as maximum
h) Now adjust the function F10 - Refrigeration time with the desired value.
5.6 - Minimum and maximum temperatures register
Press , soon appears and the minimum and maximum temperatures of S1 sensor (room
temperature). After soon appears and the minimum and maximum temperatures of S2 sensor
(evaporator).
Note: To reset the registers keep pressed the key
maximum temperatures until to be showed.
6 - INDICATORS AND ALARMS
The leds indicate the control outputs status:
REFR : Compressor or solenoid of liquid gas
FANS : Evaporator fans
DEFR : Defrost (heating)
sensor S1 (inflating / inlet air) disconnected or out of range.
Room
Evaporator sensor S2 disconnected or out of range.
sensor S3 (return / outlet air) disconnected or out of range.
Room
High r oom temperature alarm.
Alert of open door
Always that defrost ends for time and not for temperaure, a point located in the right down side of
display will blink until the next defrost indicating that:
- The interval between defrosts is too high;
- There are burned resistances;
- The hot gas is not circulating.
- There is an inoperative fan or the adjusted time is too short for the maximum duration of defrost.
Invalid configuration parameters
- In this situation the outputs are turned off.
- Check which parameters have invalid data and correct them to return to normal operation.
, releasing them after that.
and for 2 seconds until appear
, and then press (short touch).
SET
SET .
5.1-b and 5.1-c
SET to record the configured value and return
SET
Indication locked (if enabled in F19)
DEFROST DRAINING
F16 F20
for 4 seconds, until appears the
.
Maximum duration of defrost, that depends of the defrost type.
during the visualization of the minimum and
until appear
SET
,
).
until appear
(see item 5.3)