DIGITAL CONTROLLER FOR
REFRIGERATION AND DEFROST
WITH ALARM OUTPUT
Ver.04
TC-940Ri
TC940V04-03T
-10789
UL-Underwriters Laboratories
1. DESCRIPTION
O
TC-940Ri
is a digital controller of temperature that manages defrost cycles and evaporator fans.
This instrument also has an output for alarm.
An innovative feature of TC-940Ri is the possibility that the controller offers initiating a defrost cycle
evaporator temperature, detecting the moment that the system needs to do defrost. Thus, it is possible
to save energy and increase the efficiency of the system.
2. APPLICATION
• Refrigeration counters
• Refrigerated balcony
3.
/ -58 to 167°F
/ 1°F
Product in agreement with CE (European Community) and UL Inc. (USA and Canada).
TECHNICAL SPECIFICATIONS
- Power supply:
TC-9
40
Ri - 115/230 Vac ±10% (50/60 Hz)
TC-940RiL - 12/24 Vac/dc
- Control temperature:
-50 to 75° C
- Resolution:
0.1°C from -10 to 75°C and 1°C outside this range
- Operating temperature:
0 to 50°C
/
32 to 122°F
- Operating humidity:
10 to 90% RH (without condensation)
- Dimensions:
71 x 28 x 71mm
- 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)
ALRM: 3A / 250Vac resistive load (external alarm)
/ 167°F and 257°F
CLASSIFICATION ACCORDING TO IEC60730-2-9 STANDARD:
- Temperature limit of the installation surface:
50°C
/
122°F
- Type of construction:
Built-in electronic controller
- Automatic action:
Type 1
- Control of pollution:
Level 2
- Impulse voltage:
1,5kV
- Temperature for the test of sphere pressure:
75°C and 125°C
- Insulation:
Class II
4. CONFIGURATIONS
4.1 - Control temperature adjust (SETPOINT)
Press for 2 seconds until appears , and release it after that. The adjusted operation
temperature will appear. Use the keys and to change the value and then press to record it.
SET
SET
Access code: 123 (one hundred and twenty-three)
Control differential (hysteresis)
Offset indication for ambient sensor
Minimum setpoint allowed to the end user
Maximum setpoint allowed to the end user
Defrost type (0 = resistance; 1 = hot gas)
Initial defrost condition (0 = time; 1 = temperature)
Period between defrost (if F07 = 0)
Maximum time in refrigeration (for security, if F07 = 1)
Temperature in the evaporator for defrost start (if F07 = 1)
Time of pre-defrost (if F07 = 1)
Defrost when the instrument is powered on (0 - no; 1 - yes)
Evaporator temperature (S2) to finish defrost cycle
Maximum defrost duration (for security)
Fan turned on during defrost (0 - no; 1 - yes)
Delay to do the first defrost (if F07 = 0)
4.2 - Parameters table
Description
Min Max Unit
CELSIUS
Fun
Standard Min Max Unit
FAHRENHEIT
F01
F02
F03
F04
F05
F06
F07
F08
F09
F10
F11
F12
F13
F14
F15
F16
-99
0.1
-20
-50
-50
0
0
1
1
-50
0
0
-50
0
0
0
999
20.0
20.0
75.0
75.0
1
1
999
240
75.0
90
1
75.0
90
1
999
-
°C
°C
°C
°C
-
-
min.
hour
°C
min.
-
°C
min.
-
min.
-
1.5
0.0
-50
75.0
0
0
240
24
-5.0
10
0
40.0
45
0
0
-99
1
-36
-58
-58
0
0
1
1
-58
0
0
-58
0
0
0
999
36
36
167
167
1
1
999
240
167
90
1
167
90
1
999
-
°F
°F
°F
°F
-
-
min.
hour
°F
min.
-
°F
min.
-
-
-
3
0
-58
167
0
0
240
24
23
10
0
104
45
0
0
Standard
F17
F18
F19
F20
F21
F22
F23
F24
F25
F26
F27
F28
F29
F30
F31
F32
F33
0
0
-50
0
0
-50
0.1
-50
0.1
-50
0.1
0
0
0
0
0
0
1
30
75.0
3
1
75.0
20.0
75.0
20.0
75.0
20.0
999
999
999
999
999
1
-
min.
°C
min.
-
°C
°C
°C
ºC
°C
°C
min.
min.
min.
sec.
sec.
-
0
10
0.0
1
1
75.0
2.0
-50
1.0
75.0
1.0
0
0
0
0
0
1
0
0
-58
0
0
-58
1
-58
1
-58
1
0
0
0
0
0
0
1
30
167
30
1
167
36
167
36
167
36
999
999
999
999
999
1
-
min.
°F
min.
-
°F
°F
°F
ºF
°F
°F
min.
min.
min.
sec.
sec.
-
0
10
32
1
1
167
4
-58
2
167
2
0
0
0
0
0
1
Temperature indication (S1) locked during defrost
(0 - no; 1 - yes)
Draining time (dripping of defrost water)
Evaporator temperature (S2) for fan return after
draining
Maximum time for fan return after draining
(fan-delay)
Fan on with compressor off
(refrigeration)
(0 - no; 1 - yes)Fan stop for high temperature in evaporator
Differential for fan return (after stoping for high temperature
in evaporator)
Low temperature alarm (S1)
Alarm differential of low temperature
High temperature alarm (S1)
Alarm differential of high temperature
Inhibition time of alarm when the instrument is powered on
Inhibition time of alarm after draining
Delay when the instrumet is powered on
Minimum time of compressor turned on
Minimum time of compressor turned off
Compressor status with detached ambient sensor
(0 = off; 1 = on)
4.3 - Parameters description
F01 - Access code (123)
It is necessary to change the configuration parameters. To visualize the adjusted parameters, it is not
necessary to insert this access code.
F02 - Control differential (hysteresis)
It is the difference of temperature (hysteresis) between ON and OFF the refrigeration.
Example:
You need to control temperature in 4.0 ºC with differential of 1.0 ºC.
So, the refrigeration is turned off in 4.0 ºC and will be turned on in 5.0 ºC (4.0 +1.0).
F03 - Offset indication for ambient sensor
It allows to compensate eventual shuting lines on reading of ambient temperature (S1), proceeding of
sensor exchange or cable length alteration.
F04 - Minimum setpoint allowed to the end user
F05 - Maximum setpoint allowed to the end user
It is to prevent that incorrect high or low temperatures be regulated.
F06 - Defrost type
“0” = Electrical defrost (resistances),where is kept on only the defrost output.
“1” = Hot gas defrost, where defrost and compressor outputs are kept on.
F07- Initial defrost condition
It defines if the defrost start will be for temperature or time. Is this function has the value “1”, when the
evaporator temperature reaches the configured value in “F10” the instrument starts to count the pre-
defrost time and, after, will do the defrost.
F08 - Period between defrosts (if F07 = 0)
It determines the time between two consecutives defrost cycles, and starts to be counted from the last
defrost. Attention, the defrost only will start if the temperture in S2 (evaporator sensor) is lower than F13.
F09 - Maximum time in refrigeration (for security, if F07 = 1)
It acts as security time if (F07 = 1) and evaporator temperature will not reach the configured value in
“F10”. This function determines the maximum time that controller will stay without defrost.
F10 - Temperature in the evaporator for defrost start (if F07 = 1)
When evaporator temperature reaches the configured value in this function the controller will start to
count the pre-defrost period (F11).
F11 - Time of pre-defrost (se F07=1)
At the moment that the temperature in evaporator decreases and reaches the configured value in “F10”,
start to be counted the pre-defrost time. During the pre-defrost stage, if the temperature is kept low the
defrost starts, else if the temperature increase at least 1 ºC in relation to configured value, the system
returns to refrigeration stage.
F12 - Defrost when the instrument is powered on
It possibilities the defrost at the moment that the controller is turned on, for example, in return of electrical
energy (in case of energy lacks).
F13 - Evaporator temperature (S2) to finish defrost cycle
If evaporator temperature (sensor S2) reaches the adjusted value, the end defrost will happen for
temperature. With this , the defrost process is optimized.
F14 - Maximum defrost duration
This function serves to adjust the maximum value of time to defrost. If in this period the evaporator
temperature will not reach the configured value in F13 a point will be blinking on inferior down right side of
display indicating that the end defrost ocurred for time and not for temperature.
This can happen when the adjusted temperature is very high, the limit time will be not enough, the S2
sensor is detached or not in contact with the evaporator.
F15 - Fan turned on during defrost
It possibilities the fan functioning during defrost.
F16 - Delay to do first defrost (if F07=0
)
This function defines an extra time that the instrument will keep in refrigeration before do the first defrost,
to prevent that lot of counters enter in defrost at the same time. This time only appears before the first
defrost, when F07 = 0 (initial defrost for time).
F17 - Temperature indication (S1) locked during defrost
This function prevents that ambient temperature elevation be visualized. During defrost the last
measured temperature in refrigeration cycle will be locked on display. The indication will be released
when this temperature will be reached again or 15 mintes after the ibegin of next refrigeration cycle.
F18 - Draining time (dripping of defrost water)
Necessary time for dripping, it means, to drain the last water drops of the evaporator. All the outputs
keep turned off. If you do not need this stage, adjust this time for ”zero”.
F19 - Evaporator temperature (S2) for fan return after draining(fan-delay)
After the draining, the fan-delay cycle starts. The refrigeration (REFR.) output is turned on, because the
evaporator temperature is high, but the fan only is turned on after evaporator temperature decreases the
adjusted value. This process is necessary to remove the heat that exists in the evaporator because the
defrost, preventing to pass it pass it to the ambient.
