Full Gauge Controls TC-920Ri Manual

1. DESCRIPTION

The TC-920Ri 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 is possible to configure the third sensor in order to control the temperature in
the condenser or to control another evaporator.
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: 90 - 250Vac ±10%(50/60Hz)
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: 3A/ 250Vac (defrost - resistance or hot gas)
- Dimensions: 71 x 28 x 71mm
- Sensors:
S1: Room sensor (inflating / inlet air) - Black cable - Follow the product
S2: Evaporator sensor - Gray cable - Follow the product
S3: Sensor with configurable position (Room - Return / outlet air, 2nd evaporator or condenser)

4. CONFIGURATIONS

4.1 - Control temperatures adjust (SETPOINTS):

- Press for 2 seconds until appears
SET
working temperature adjusted. Use and
record it. Soon after it (economic setpoint ) will appear, if configured on F33, repeats the
procedure above to modify the value and leave the function.

4.2 - Parameters table

Fun Description
Access code:123 (one hundred and twenty-three)
Control differential (hysteresis)
Offset indication of room sensor (Offset S1)
Offset indication of evaporator sensor (Offset S2)
Offset indication of sensor S3 (Offset S3)
Minimum setpoint allowed to the end user
Maximum setpoint allowed to the end user
Delay when the instrument is powered on
Refrigeration time (interval between defrosts)
Minimum compressor time ON
Minimum compressor time OFF
Compressor status with detached room sensor (S1)
Defrost when the instrument is powered on
Evaporator temperature (S2 / S3*) for determine
Maximum duration of defrost
Fan turned on during defrost
Defrost type (0 - electric / 1 - hot gas)
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
Operation mode of digital input
Low ambient temperature alarm (sensor S1)
Low temperature alarm hysteresis
High room temperature alarm (sensor S1)
High temperature alarm hysteresis
Alarm inhibition time after powering the instrument on (Sensor S1 alarm)
TC-920Ri
CONTROLLER FOR REFRIGERATION
AND DEFROST WITH DIGITAL INPUT
Ver.04
TC-920Ri allows the configuration of two setpoints:
- Sensor 3 sold separately.
, and release it after that. It will appear
keys to change the value and then press
end of defrost

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 of room sensor (Offset 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 of evaporator sensor (Offset 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 of sensor S3 (Offset 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 - Mini mum 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 - 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).
Attention, defrost will begin only if the temperature in S2 (evaporator sensor) is lower than the indicated
in F14.
F10 - Minimum compress
It is the minimum time that the compressor will keep turned on, it means, the time period between the last
started and the next stopped. It serves to prevent high voltage from the mains.
and the
to
SET
CELSIUS
Unid
Min Max Default
-99 999 -
0.1 20.0 °C 1.5
-20 20.0 °C
-20 20.0 °C
-20 20.0 °C
-50 75.0 °C -50
-50 75.0 °C 75.0
0 30 min.
1 999 min. 240
0 999 sec.
0 999 sec.
0 - OFF 1 - ON -
0 - No 1 - Yes -
-50 75.0 °C 40.0
0 - inactive 90 min.
0 - No 1 - Yes -
0
0 1 -
0 - No 1 - Yes - 0
min.
0 30
-50 75.0 °C
0.0
0 30 min.
0 - No 1 - Yes -
1 - Yes
-50 75.0 °C 75.0
0 4 -
-50 75.0 °C -50
20.0 °C
0.1
-50 75.0 °C
75.0
0.1 20.0 °C
1.0
0 999 min.
or time ON
FAHRENHEIT
Unid
Min Max Default
- - - - -
1 36 °F 3
0 -36 36 °F 0
0 -36 36 °F 0
0 -36 36 °F 0
-58 167 °F -58
-58 167 °F 167
0 0 30 min. 0
1 999 min. 240
0 0 999 sec. 0
0 0 999 sec. 0
1 0 - OFF 1 - ON - 1
0
0 - No 1 - ON - 0
-58 167 °F 104
45 0 - inactive 90 min. 45
0 - No 1 - Yes - 0
- No
0 0 1 - 0
-
- No 0 - No 1 - Yes 0
0 30 min.
10 10
-58 167 º F
32
0 30 min.
1 1
0 - No 1 - Yes - 1
-58 167 °F 167
0 0 4 - 0
°F
-58 167 -58
1 36 °F
1 2
-58 167 °F
167
1 36 °F 2
0 0 999 min. 0
E251415