Full Gauge Controls TC-940Ri User Manual

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-940Ri - 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 pre­defrost 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.

F20 - Maximum time for fan return after draining (fan-delay)

For security, if the evaporator temperature does not reach the adjusted value in F19 or the S2 sensor is
detached, the fan-delay will happen after passed the adjusted time in this function.

F21 - Fan on with compressor off (in refrigeration)

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.

F22 - Fan stop for high temperature in evaporator

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 F23.

F23 - Differential for fan-delay (after stopping for high temperature in evaporator)

It allows to determine the difference of temperature to fan-delay had to a stop for temperature above
desired in evaporator.

F24 - Low temperature alarm (S1)

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) of alarm will be turned on.

F25 - Alarm differential of low ambient temperature

It is the difference of temperature to turn off the alarm output for low ambient temperature.

F26 - High temperature alarm (S1)

If the ambient temperature (sensor) reaches this point during the refrigeration, this will be signalized
through the message on display and the output (NO) of alarm will be turn on.

F27 - Alarm differential of high temperature

It is the temperature to turn off the alarm output for high ambient temperature.

F28 - Inhibition time of alarm when the instrument is powered on

During this time the alarm is kept turned off waiting that the system starts to working.

F29 - Inhibition time of alarm after draining

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.

F30 - Delay when the isnstrument is powered on

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).

F31 - Minimum time of compressor turned on

It is the time that the compressor will keep turned on, it means, the time period between the last started and
the next stopped.

F32 - Minimum time of compressor turned off

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.

F33 - Compressor status with detached ambient sensor (S1)

If the ambient sensor (S1) is detached or out specified range, the compressor assumes the configured
status in this function.
Exemple: 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.

4.3.1 - Unit selection (ºC/ºF)

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).

5. OPERATION

5.1 - Parameters visualization

a) Press at the same time the keys and for 2 seconds until appear , releasing them after that.
Soon, appears .

b) Use the keys and to access the desired function.
c) After select the function, press (short touch) to visualize the configured value.
d) Press again (short touch) to return the functions menu.
e) To reset the menu and return to normal operation (temperature indication), press until appear .

SET

SET

SET

SET

SET

SET

5.2 - Parameters alteration

a) 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).

b) Use and to enter the access code (123), and then press .
c) Select the desired function and visualize the configured value, like explained the itens“5.1-b” and

“5.1-c”.
d) Use and to change the value and then press to record the configured value and return
to the functions menu.
e) To reset the menu and return to normal operation (temperature indication), press until appear
.

5.3 - Process stage, elapsed time and evaporator temperature (S2)

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 F07 = 1)
Defrost
Draining

SET

SET

SET

SET

5.4 - Initial defrost condition

The function “F07” determines if the start of the defrost will be for time or temperature.

F07 = 0 The start of defrost will happen after elapsed the configured time in F08.
F07 = 1 When the temperature in the evaporator reaches the configured value in F10, the

count of pre-defrost period will start (F11). After elapsed this time, if the temperature keeps low the
defrost will start. If the temperature increases, the controller returns to refrigeration stage.

5.5 - How to determine the end defrost for temperature

a) Adjust the follow functions with maximum values:

- Interval between defrosts (F08 = 999 min)

- Evaporator temperature for end defrost (F13 = 75 ºC)

- Defrost maximum duration (F14 = 90 min)

b) Wait until an ice layer to be created on the evaporator.
c) Do a manual defrost, pressing or 4 seconds, until appear .
d) Observe the melting process.

FAN-DELAY

REFRIGERATION

DEFROST

DRAINING

PRE-DEFROST

e) Wait until melt all defrost on evaporator to consider the defrost finalized.
f) Check the temperature in evaporator read by the sensor S2 at this moment, pressing and copy

this value to the function F13 - Evaporator temperature (S2) for end defrost.
g) As security, adjust again the function F14 - Maximum duration of defrost, that depends of the defrost
type. Exemple: Electrical defrost (resistance) = 45 minutes as maximum

Defrost for hot gas = 20 minutes as maximum

h) Now adjust the function F08 - Interval between defrosts as desired value.

5.6 - Manual defrost

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 .

5.7 - Indicators and Alarms

The leds indicate the control outputs status:

REFR: Compressor or solenoid of liquid gas
FANS: Evaporator fans
DEFR: Defrost (resistances or hot gas)
ALRM: Alarm output

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.

5.8 - Registers of minimum and maximum temperatures

Press . Will appear and minimum and maximum temperatures of black sensor ( ambient). After
appear and minimum and maximum temperatures of gray sensor (evaporator).
Note: To reset the registers, keep pressed during visualization of minimum and maximum temperatures
until appear .

5.9 - Alarm inhibition

To inhibit the alarm press the key . The messages will appear. After the inhibition, the
alarm output returns to be enabled when the instrument leaves the alarm status.

SET

Power
supply

Loads

supply

4 - 5
4 - 6

115V
230V

12V
24V

TC-940Ri TC-940RiL

72 mm

29 mm

6. ELECTRICAL CONECTIONS

Sensor 2

gray cable (evaporator)

REFR

DEFR

FANS

COMMON

1

2

4

5

6

7

8

9

10

11

12

3

1

2

4

5

6

7

8

9

10

11

12

3

ALRM

Sensor 1

black cable (ambient)

0

115V
(12V )

230V
(24V )

Install a magnetic contactor when

exceeding specified current.

Dimension of the clipping

for setting of the instrument

in panel

IMPORTANT
According to the chapters from the IEC60364 standard:
1: Install protectors against over voltage on power supply.
2: Sensor cables and computer signals can be together, however not at the same place where power

supply and load wires pass for.
3: Install suppresor of transient in parallel to loads to increase the usefull life of the relays.

Fo r m ore in for mat io n c ont act ou r a ppl ica tio n en g. depa rtm ent thr oug h e- mai l
support@ fullgauge.com or dial +55 51 3475.3308.

Contact suppresor connection diagram

Suppresor

A1

A2

A1 e A2 are the
contactor coils.

Diagram for suppresor installation
for direct drive load inputs

Load

Suppresor

For direct activation the maximum
specified current should be taken
into consideration.

Note: The sensor cable lenght can be increased by the user until 200 meters using 2 x 24 AWG cable.

PROTECTIVE VINYL:

This adhesive vinyl (included inside the packing) protects the instruments against
water drippings, as in commercial refrigerators, for example. Do the application after
finishing the electrical connections.

Remove the protective paper
and apply the vinyl on the entire
superior part of the device,
folding the flaps as indicated by
the arrows.