Full Gauge Controls TC-920Ri Manual

1. DESCRIPTION
TC-920Ri
The is a temperature controller device for the frozen food industry, which can also be
used to control the evaporator fan and to manage the defrosting cycles.
It works with up to 3 sensors, two of them are for room temperature measurement (air inlet and air return)
and the third one can be fixed in the evaporator to control the ending of defrosting operation and
returning of fan operation.
It also includes a digital input to receive external pulses for controlling the start of defrosting operation or
for monitoring the chamber door status.
Aiming to reduce the power consumption, the
normal and power saving. This is possible when the third sensor is used for measuring the return air
temperature, which allows the selection of active setpoint based on the temperature difference between
the inlet air sensor and the return air sensor (S3 - S1).
When the difference between the sensors is above the value configured by the user (high level of
thermal exchange), the active setpoint is the normal (SP1). When the difference between the sensor is
below another value also configured by the user (low level of thermal exchange), the active setpoint is
the Power Saving (SP2), which must be configured to a temperature higher than SP1 in order to reduce
the compressor ON time, which in turn decreases the electric power consumption.
Product complies with UL Inc. (United States and Canada).
2. APPLICATION
• Counters
• Refrigerating balconies
3. TECHNICAL SPECIFICATIONS
- Power supply: 115 or 230Vac ±10%(50/60Hz)
- Control temperature: -50 to 75° C / -58 to 167°F
- Operating temperature: 0 to 50°C / 32 to 122°F
- Operating humidity: 10 to 90% RH (without condensation)
- Resolution: 0.1°C from -10 to 75°C and 1°C outside this range
1°F in wall range
- Load current (outputs): REFR: 5(3)A/ 250Vac 1/8HP (compressor, solenoid valve or contactor)
FANS: 5(3)A/ 250Vac 1/8HP (evaporator fans)
DEFR: 5(3)A/ 250Vac (defrost - resistance or hot gas)
- Dimensions: 71 x 28 x 71mm
- Sensors:
S1: Room sensor (inflating / inlet air) - Black cable
S2: evaporator sensor - Gray cable
S1: Room sensor (return / outlet air) - Does not follow the product
4. CONFIGURATIONS
4.1 - Control temperatures adjust (SETPOINTS):
- Press SET for 2 seconds until appears
working temperature adjusted . Use
record it. Soon after it (economic setpoint ) will appear, repeats the procedure above modify the
value and leav the function. e
4.2 - Parameters table
Fun Description
Access code:123 (one hundred and twenty-three)
Control differential (hysteresis)
Offset indication for room sensor (inflating / inlet air) - Offset S1
Offset indication for evaporator sensor (Offset S2)
Offset indication for room sensor (return / outlet air) - Offset S3
Minimum setpoint allowed to the end user
Maximum setpoint allowed to the end user
Delay when the instrument is powered on
Act point of high room temperature alert (S1)
Refrigeration time (interval between defrosts)
Compressor delay after on (on - off)
Compressor delay after off (off - on)
Compressor status with detached ambient sensor (S1)
Defrost when the instrument is powered on
Evaporator temperature (S2) for end defrost
Maximum duration of defrost (for security)
Fan turned on during defrost
Defrost type
Locked temperature indication (S1) during defrost
Draining time (dripping of defrost water)
Evaporator temperature (S2) for fan return after draining
Maximum time of fan return after draining (fan-delay)
Fan on with compressor off (refrigeration)
Fan stopped for high temperature in the evaporator
Digital input operation mode
S3 sensor enabling
Temperature difference (S3 S1) above which the setpoint SP1 is activated
Temperature difference (S3 S1) below which the setpoint SP2 is activated (economic setpoint)
TC-920Ri
CONTROLLER FOR REFRIGERATION
AND DEFROST WITH DIGITAL INPUT
Ver.01
TC-920Ri
allows the configuration of two setpoints:
, and release it after that . It w ill appear
and keys to change the value and then press
4.3 - Parameters description
F01 - Access code (123)
To change the parameters it is necessary to use the access code.It is not necessary to use the access
code to visualize the adjusted parameters.
F02 - Control differential (hysteresis)
It is the difference of temperature (hysteresis) between to turn OFF and turn ON the refrigeration output.
Example: To control the temperature in 4.0°C with differential of 1.0°C. Soon, the refrigeration will be
turned off in 4.0°C and turned on again in 5.0°C (4.0 + 1.0)
F03 - Offset indication for sensor S1
It allows to compensate eventual shunting lines in the reading of room temperature (S1) proceeding
from the exchange of the sensor or cable length alteration
F04 - Offset indication for sensor S2
It allows to compensate eventual shunting lines in the reading of evaporator temperature (S2)
proceeding from the exchange of the sensor or cable length alteration
F05 - Offset indication for sensor S3
It allows to compensate eventual shunting lines in the reading of room temperature (S3) proceeding
from the exchange of the sensor or cable length alteration
F06 - Minimum setpoint allowed to the end user
F07 - Maximum setpoint allowed to the end user
Electronic limits whose purpose is prevent that too high or too low setpoint temperatures are regulated.
F08 - Delay when the instrument is powered on
When the instrument is powered on, its control is kept disabled during a time, delaying the start of
process. During this time, it works only as temperature indicator. It serves to prevent demand of electric
energy peaks, in case of lack or return of the same and when exists a lot of equipment connected on the
same net. For this, just adjust different times for each equipment. This delay may be of compressor or
defrost (when exist defrost on turn on).
F09 - Act point of high room temperature alert
If the room temperature (sensor S1) reaches this point during refrigeration, this will be signaled visually
through the indication blinking on display.
F10 - Refrigeration time (interval between defrosts)
It is the time which compressor will turn on and turn off only for room temperature and starts to be
counted when the fan is turned on , after fan-delay stage (fan return after draining).
F11 - Compressor delay after on (on-off)
It is the minimum time that compressor will keep on, it means, space of time between the last drive and
the next stop. It serves to prevent high voltage events in the electric network.
F12 - Compressor delay after off (off-on)
It is the minimum time that compressor will keep off, it means, space of time between the last stop and
and the
the next drive. It serves to alliviate the discharge pressure and to increase the time of useful life of the
SET to
compressor.
to
CELSIUS
Min Max Unid
- - -
0.1 20.0 º C
-20.0 20.0 º C
º C
-20.0 20.0
-20.0 20.0 º C
-50.0 75.0 º C
-50.0 75.0 º C
0 30 min.
-50.0 75.0 º C
1 999 min.
0 999 sec.
0 999 sec.
0 - off 1 - on -
0 - no 1 - yes -
-50.0 75.0 º C
0 - inactive 90 min.
0 - no 1 - yes -
0 - electric 1- hot gas -
0 - no 1 - yes -
0 30 min.
-50 .0 75.0 º C
0 30 min.
0 - no 1 - yes -
-50 .0 75.0 º C
0 2 -
0 - disable 1 - enable -
0.1 20.0 °C
0.1 20 .0 °C
FAHRENHEIT
Default Min Max Unid Default
- - - -
1.5 1 36 º F
0 -36 36 º F
º F
0 -36 36
0 -36 36 º F
-50 -58 167 º F
75 -58 167 º F
0 0 30 min.
75 -58 167 º F
240 1 999 min.
0 0 999 sec.
0 0 999 sec.
1 0 - off 1 - on -
0 0 - no 1 - yes -
40 -58 167 º F
45 0 - inactive 90 min.
0 - no 0 - no 1 - yes -
0 - electric 0 - electric 1 - hot gas -
0 - no 0 - no 1 - yes -
10 0 30 min.
0 -58 167 º F
1 0 30 min.
1 - yes 0 - no 1 - yes -
75 -58 167 º F
0 0 2 -
1 - enable 0 - disable 1 - enable - 1 - enable
5.0 1 36 °F
2.0 1 36 °F
UL-Underwriters Laboratories
-
3
0
0
0
-58
167
0
167
240
0
0
1
0
104
45
0
0
0
10
32
1
1
167
0
9
4