TRUE TEMPERATURE CONTROLS OPERATION WWW TRUEMFG …

28

TRUETEMPERATURE CONTROLS SEQUENCE OF OPERATION WWW.TRUEMFG.COM

29


Control version will vary with model and age of cabinet.

LAE ELECTRONIC TEMPERATURE CONTROLS

LAE CURRENT PROBES:

GRAY- Thermostat

BLUE - Defrost

YELLOW - Display

LAE PRIOR PROBES:

Probes are identical.

LAE:

t1 = Thermostat

t2 = Defrost

t3 = Display

t3 probe is not installed and / or activated in all

applications if t3 is not installed and / or activated,

the display probe is t1.

30


LAE ELECTRONIC CONTROL GENERAL SEQUENCE OF OPERATION

1. Cabinet is plugged in.

a. Display will illuminate.

b. Interior light will illuminate on Glass Door Models only. Solid door cabinet lights are controlled by the door switch.

2. After the LAE control preprogrammed time delay of up to 6 minutes, the compressor and evaporator fan(s) will start if the

control is calling for cooling.

a. Control or condenser fans may be already pre-programmed from the factory so at the start of every compressor cycle or

during a defrost cycle, the condenser fan(s) will reverse for 30 seconds to blow dirt off the condensing coil.

3. The LAE control will cycle the compressor but may also cycle evaporator fan(s) on and off determined by the Set-Point and

Differential temperatures.

a. The Set-Point is the adjustable preprogrammed temperature.

b. The Differential is the non adjustable preprogrammed temperature.

c. The LAE control is designed to read and display a cabinet temperature not a product temperature.

This cabinet temperature may reflect the refrigeration cycle of the Set-Point and its Differential, or it may show an

average temperature.

The most accurate temperature on a cabinets operation is to verify the product temperature.

Example: If the Set-Point is -9°F/-23°C and the Differential is 10°F/5°C

(Set-Point) -9°F + 10 (Differential) = 1°F Or

(Set-Point) -23°C + 5 (Differential) = -18°C

The compressor and evaporator fan(s) will cycle off -9°F/-23°C and back on at 1°F/-18°C

4. The LAE control may be preprogrammed to initiate defrost by interval or at specific times of day.

a. At this time the “dEF” will appear on the display and compressor will turn off until a preprogrammed temperature or

duration is reached. During this time for freezers only, evaporator fan(s) will also turn off and the coil heater and drain tube

heaters will also be energized. Some cabinets may also change the rotation of the reversing condenser fan motor.

b. After the preprogrammed temperature or duration for defrost has been reached there may be a short delay for both the

compressor and evaporator fans to restart. At this time “dEF” may still appear on the display for a short time.


31


LAE MODEL TMW ELECTRONIC CONTROL GENERAL SEQUENCE OF OPERATION



2. After the LAE control preprogrammed time delay of up to 6 minutes, the compressor will start if the control is calling

for cooling.

a. Control may be already preprogrammed from the factory so at the start of every compressor cycle, the condenser fan(s)

will reverse for 30 seconds to blow dirt off the condensing coil.

3. The LAE control will cycle the compressor on and off determined by the Set-Point and Differential temperatures.



c. The LAE control is designed to read and display a cabinet temperature not a product temperature. This cabinet

temperature may reflect the refrigeration cycle of the Set-Point and it’s Differential, or it may show an average

temperature. The most accurate temperature on a cabinets operation is to verify the product temperature.

Example: If the Set-Point is -9°F/-23°C and the Differential is 10°F/5°C

(Set-Point) -9°F + 10 (Differential) = 1°F

Or

(Set-Point) -23°C + 5 (Differential) = -18°C

The compressor will cycle off -9°F/-23°C and back on at 1°F/-18°C

4. The LAE control is not and cannot be preprogrammed to initiate defrost, only refrigeration.

a. The cabinet will need to be manually defrosted. Unplug the cabinet or turn the LAE control to “OFF" per LAE

instruction sheet. The manual defrost frequency will depend on the units usage, environment, and the amount of frost.


32


LAE MODEL HEATED CABINET ELECTRONIC CONTROL GENERAL SEQUENCE OF OPERATION



2. The LAE control will energize the heat elements if the control is calling for heat.

3. The LAE control will cycle the heating elements on and off determined by the Set-Point and Differential temperatures.



c. The LAE control is designed to read and display a cabinet temperature not a product temperature. This cabinet

temperature may reflect the heating cycle of the Set-Point and it’s Differential. The most accurate temperature on a

cabinets operation is to verify the product temperature.

Example: If the Set-Point is 180°F/82.2°C and the Differential is 1°F/.56°C

(Set-Point) 180°F + 1 (Differential) = 181°F Or

(Set-Point) 82.2°C + .56 (Differential) = 82.76°C

The heating elements will cycle on 180°F/82.2°C and back off at 181°F/82.76°C


33


PRODUCT ADVISEMENT

DETERMINING THE TYPE OF ELECTRONIC CONTROL DISPLAY

Reason for Advisement

Both Danfoss and LAE electroinc controls utilize similar digital displays.

To provide the visual differences and operations between the displays used for the LAE Electronic Control and the Danfoss

Electronic control

NOTE: Displays do not interchange with each other due to wiring and programming limitations.

LAE electronic control board

Danfoss electronic control board

Previous Danfoss display

DISPLAY FOR LAE CONTROL

DISPLAY FOR DANFOSS CONTROL

Alarm Symbol

No Alarm Symbol

Info / Scroll

Defrost

Defrost / Down

Down

Manual / Up

Up

Power

Power


34


HOW TO USE AN LAE ELECTRONIC CONTROL

LOCKING AND UNLOCKING THE LAE CONTROLLER:

WHY: Locking of control is necessary to prevent changes to program that may

affect cabinet operation.

STEP 1 - To change lock setting press and release the Info button . “t1”

will appear. See image 1.

STEP 2 - Press the Down button until “Loc” appears. See image 2.

STEP 3 - While pressing and holding the Info button press the

Up or Down button to change the lock settings. If “no” appears, the

controller is unlocked. If “yes” appears, the controller is locked. See images 3 and

4.

STEP 4 - Once the lock setting has been set correctly release the info button

. Wait 5 seconds for the display to show temperature. See image 5.

HOW TO LOCK AND UNLOCK LAE CONTROLLER:

Image 3: If “no” appears on screen,

the controller is unlocked.

3

2

1

5

4

Image 4: If “yes” appears on screen, the

controller is locked.

LAE Control

Info / Set Point

Button

Manual Activation

Up Button

Manual Defrost /

Down Button

Stand-By

Button

LAE Control Icons

Compressor Running

Activation of 2nd Parameter Set

Alarm

Cabinet in Defrost

Evaporator Fan Running


35


HOW TO TURN OFF THE LAE ELECTRONIC CONTROL:

HOW TO TURN THE LIGHTS ON AND OFF:

ON Position

TURN OFF THE LAE ELECTRONIC CONTROL:

May need to unlock control.

WHY: Turning off the control will deactivate all electrical components.

CAUTION: Turning off the control will not shut off power to the cabinet.

Cabinet must be unplugged prior to any repair.

STEP 1 - To turn off control, press and hold the Stand-by button until

"OFF" appears. Release Stand-by button. See Image 2.

STEP 2 - To turn on control, repeat prior steps and a temperature

will appear.

TURN THE LIGHTS ON AND OFF:


WHY: Light may be controlled by LAE Controller or interior light switch.

STEP 1 - To control interior / sign lights by the LAE Controller, press and release

the Manual Activation button .

STEP 2 - To control interior / sign lights by the interior door switch, depress the

rocker switch to the “ON” position. Light switch is located on inside top right of

the ceiling.

NOTE: Not all moels have an interior light switch. Location of interior light

switch will vary by model. Example shown is an interior switch on an Upright

Glass Door cabinet.

1

2

LAE Control

Manual Activation

Up Button

Info / Set Point

Button

Stand-By

Button

Manual Defrost /

Down Button


36


CHANGING THE “SET POINT”:


WHY: To make an adjustment to the product/cabinet temperature.

NOTE: The electronic control CANNOT convert a Freezer to a Refrigerator or a

Refrigerator to a Freezer.

STEP 1 - To see the set point, press and hold the Info button .

See image 1.

STEP 2 - While still holding the Info button , press the Up or

Down button to change the “set point”.

STEP 3 - Once the “set point” has been set correctly release the Info

button . The display will show temperature. See image 2.

1

2

LAE Control

Manual Activation

Up Button

Info / Set Point

Button

Stand-By

Button

Manual Defrost /

Down Button


HOW TO CHANGE THE “SET POINT”:

37


INITIATE A MANUAL DEFROST:


WHY: A one time additional defrost may be necessary to clear accumulated

frost / ice from evaporator coil.

The method to initiate a manual defrost is determined by the Defrost Mode Parameter “DFM” preprogrammed in the controller.

REGULAR TIME DEFROST (TIM)

If controller is preprogrammed for “TIM”, press and release the Manual Defrost

button until “dEF” appears.

REAL TIME CLOCK (RTC)

If controller is preprogrammed for “RTC” press the and hold the Manual Defrost

button for 5 seconds until “dh1” appears. Release the Manual Defrost

button and then press and hold for an additional 5 seconds until “dEF”

appears.

NOTE: Defrost will only terminate once a specific preset temperature or a

preset time duration is reached.

LAE Control

Manual Activation

Up Button

Info / Set Point

Button

Stand-By

Button

Manual Defrost /

Down Button


HOW TO INITIATE A MANUAL DEFROST:

38


1a

1c

1b

2

3

4

CHANGING “DEFROST INTERVALS”:


This can only be changed if defrost mode parameter “DFM” is set for “TIM”.

WHY: The defrost interval is the time duration between defrost cycles. The

defrost interval time starts when the cabinet is supplied power or after a manual

defrost.

STEP 1 - To see the set point, press and hold the Info button and the

Stand-by button at the same time.

NOTE: Depending on the version of control, one of three parameters will

appear: “ScL” image 1a, “SPL” image 1b, “MdL” image 1c.

STEP 2 - Push the Up button until “dFt” appears. See image 2.

STEP 3 - Press and hold the Info button to see the defrost interval time.

See image 3

STEP 4 - While pressing and holding the Info button , press the

Up or Down button to change the defrost interval times (higher

the number the less frequent the cabinet will defrost).

STEP 5 - Once the defrost interval time has been changed, release the Info

button .

STEP 6 - Wait 30 seconds for the display to show temperature.

See image 4.

LAE Control

Manual Activation

Up Button

Info / Set Point

Button

Stand-By

Button

Manual Defrost /

Down Button


HOW TO CHANGE “DEFROST INTERVALS”:

39


CHANGE DISPLAY READOUT FROM FAHRENHEIT TO CELSIUS:


This can NOT be changed with the LAE model AR2-28 version of the control.

See page 32 for more information.

WHY: Changing readout will assist with customer application.

STEP 1 - To change the display, press and hold the Info button and the

Stand-by button at the same time. “MdL” or “SPL” will appear.

See images 1a and 1b.

STEP 2 - Push the Down button until “ScL” appears. See image 2.

STEP 3 - Press and hold the Info button to see the “readout scale”. See

image 3.

STEP 4 - While pressing and holding the Info button , press the

up or down button to change the “readout scale".

See image 4.

STEP 5 - Once the “readout scale” has been changed, release the info button

.

STEP 6 - Wait 30 seconds for the display to show temperature.

See image 5.

1a

1b

2

3

4

5

LAE Control

Manual Activation

Up Button

Info / Set Point

Button

Stand-By

Button

Manual Defrost /

Down Button


HOW TO CHANGE DISPLAY READOUT FROM FAHRENHEIT TO CELSIUS:

40


2

1DISPLAYING TEMPERATURE PROBES, T1, T2, T3:

WHY: To display temperature probe readings in different locations of the

cabinet.

Also, display may show an average cabinet temperature and not a specific probe

temperature.

STEP 1 - To display T1 temperature, press and release the info button .

“t1” will appear. See image 1.

STEP 2 - Press and hold the info button . This is the temperature of the

T1 Probe. See image 2.

STEP 3 - By releasing the info button , “t2” will appear. Press and hold the

info button to display the temperature of the T2 probe.

STEP 4 - By releasing the info button again, “t3” will appear. Press and

hold the info button to display the temperature of

the T3 probe. (If probe T3 is not activated, “t3” will not appear of

the display.)

DISPLAY CODES

DISPLAY Defrost in progress Room high temperature alarm Controller in stand-by Room low temperature alarm Door open alarm Probe T1 failure Instant Probe 1 temperature Probe T2 failure Instant Probe 2 temperature Probe T3 failure

Instant Probe 3 temperature Maximum probe 1 temperature recorded Minutes of the Real Time Clock Minimum probe 1 temperature recorded Hours of the Real Time Clock Keypad state lock

LAE Control

Manual Activation

Up Button

Info / Set Point

Button

Stand-By

Button

Manual Defrost /

Down Button


HOW TO DISPLAY PROBE TEMPERATURES:

41


984823

STEP 2: With the display showing “t1”, press and release

the down button until “loc” appears. “loc” is the

parameter to lock and unlock.

HOW DO WE UNLOCK THE CONTROL?

STEP 1: With the display showing temperature, press and

release the info button until “t1” appears.

STEP 3: With the display showing “loc”, press and hold

the info button until “yes” appears. “yes” shows the

control is locked out.

Continue holding the info button.

NOTE: Holding the info button allows the param-

eter to be displayed and then changed.

STEP 4: With the display showing “yes”, and while still

holding the info button press and release the down

button until “no” appears. “no” shows the control is

unlocked.

Release all buttons.

THE CONTROL IS NOW UNLOCKED.

WHY DO WE LOCK THE CONTROL?

The control is locked to prevent unnecessary changes to

the program that may affect cabinet operation.

THE DISPLAY WILL READ AN INTERIOR

CABINET TEMPERATURE DURING NORMAL

OPERATION.

INFO BUTTON

DOWN BUTTON

UP BUTTON

POWER BUTTON

2

3

4

1


INSTRUCTIONS FOR SETTING THE OPTIONAL TEMPERATURE ALARM RANGES ON THE

ELECTRONIC CONTROL (CONTINUED)

42


WHY DO WE NEED TO SET THE ALARM ON

THE ELECTRONIC CONTROL?

The alarm will advise that a temperature has gone above

and/or below the cabinets Cut-in and/or Cut-out temper-

ature after a determined time has expired.

STOP: Prior to proceeding, please contact The

True Manufacturing tech service department as

they will provide assistance in verifying the cut in

and cut out settings of your electronic control.Control may need to be unlocked. See instructions on

how to unlock the electronic control.

STEP 2: With the display showing “ScL”, “SPL’ or “MDL”,

press and release the info button until “AtM”

appears.

“AtM” is the parameter to change alarm mode.

STEP 3: With the display showing “AtM”, press and hold

the info button until “non” appears. “non” shows

the alarm is not active. Continue holding the info button.



STEP 4: With the display showing “non”, and while still

holding the info button , press and release the down

button to change the setting to “AbS”. Release

both buttons.

“AbS” shows the alarm will be an absolute number.

NOTE: The procedure of holding the info button

while then pressing and releasing the up button or

the down button will allow the parameter setting to

be displayed and then changed. Releasing the buttons will

allow the control to scroll to the next parameter.

THIS PROCEDURE WILL BE REPEATED ON

THE FOLLOWING PARAMETERS.

HOW DO WE PROGRAM THE ALARM

SETTING ON THE ELECTRONIC CONTROL?


hold the info button and the power button

at the same time until either “ScL”, “SPL’ or “MDL” appears.

Release both buttons.



OPERATION.

INFO BUTTON

DOWN BUTTON

UP BUTTON

POWER BUTTON

1

2

3

4



ELECTRONIC CONTROL

43


STEP 5: The display will now show “ALA”. Press and hold

the info button until a temperature appears. “ALA”

is the parameter for the low alarm setting.

With the display showing a temperature, and while still

holding the info button , press and release the down

button to change the temperature below the

Cut-Out Temperature.

NOTE: True Manufacturing recommends this tempera-

ture to be at least 3 degrees colder than the Cut-Out

temperature to prevent a false alarm.


STEP 7: Press and release the info button until

“Atd” appears.

STEP 8: With the display showing “Atd”, and while

holding the info button press and release the up

button to change alarm delay in minutes. “Atd” is

the parameter for the delay alarm setting.

NOTE: True Manufacturing recommends this time delay

to be at least 30 minutes to prevent a false alarm.


THE ALARM AND TIME DELAY IS NOW SET.

STEP 6: The display will now show “AhA”. Press and hold

the info button until a temperature appears. “AhA”

is the parameter for the high alarm setting.

With the display showing a temperature, and while still

holding the info button press and release the up

button to change the temperature above the Cut-In

Temperature.

NOTE: True Manufacturing recommends this tempera-

ture to be at least 3 degrees warmer than the Cut-In

temperature to prevent a false alarm.


7

8

5

6



ELECTRONIC CONTROL (CONTINUED)

44


WHY DO WE LOCK THE CONTROL?

The control is locked to prevent unnecessary changes to

the program that may affect cabinet operation.

STEP 2: With the display showing “t1”, press and release

the down button until “loc” appears. “loc” is the

parameter to lock and unlock..

HOW DO WE LOCK THE

ELECTRONIC CONTROL?


release the info button until “t1” appears.

STEP 3: With the display showing “loc”, press and hold

the info button until “no” appears. “no” shows the

control is unlocked.

Continue holding the info button.



STEP 4: With the display showing “no”, and while still

holding the info button , press and release the up

button until “yes” appears.

“yes” shows the control is locked out.

Release all buttons.

THE CONTROL IS NOW LOCKED.



OPERATION.

INFO BUTTON

DOWN BUTTON

UP BUTTON

POWER BUTTON

2

1

4

3



ELECTRONIC CONTROL

45


LAE CONTROL PARAMETER LIST ORDER

AR2-28-1TM and 2TM

SCL IISMSPL IISLSPH IISHSP IISP

C-H IIHYHYS IIFCCRT HDSCT1 IIDFCT2 SBCSD DSMDFM DI2DFT STTDH1 EDTDH2 LSMDH3 OA1DH4 OA2DH5 CDDH6 INPDLI OS1

DTO T2DTY OS2DPD T3DRN OS3DDM TLDDDY TDSFID AVG

FDD SIMFTO ADRFCMFDTFDHFT1FT2FT3ATMALAAHAALRAHRATI

ATDADOAHMAHTACC

BR1-28

MDL IISMSPL IISLSPH IISHSP IISP

C-H IIH0HY0 IIH1HY1 IIHTCRT IIDFCT1 IIFCCT2 ECSHRT EPTTIL SBHT DSM

DFM DADDFT CSDDFB D1ODH1 D1ADH2 D2ODH3 D2ADH4 LSMDH5 LSADH6 STTDLI EDT

DTO OA1DTY OA2DSO OA3SOD 2CD DPD OS1DRN T2DDM OS2DDY T3FID OS3

FDD T4FTO OS4FCM TLDFDT TDSFDH AVGFT1 SCLFT2 SIMFT3 ADRFMS BTEATM RFSALAAHAALRAHRATI

ATD

Per our design or control version, all

Parameters may or may not be displayed.

SUBJECT TO C

HANGE

SUSUSUSSUSUSUBJECT TOTOTOTOTOTOTOTOTTTT

UBUBUBUBUBUBUBUBUBUUUUU

TOTOTOTOT TTT TT T

CTCTCCCCCTCCCECECECECECECECECECECJE

CECECECECECEEJEEEEEEEEBJUBUBUU

ALSMLSMLSASTTTEDTED

O OODTYDSOSODDPDD


46


Per our design or control version, all

Parameters may or may not be displayed.

LAE CONTROL PARAMETER LIST ORDER

BIT25

SPL IISMSPH IISLSP IISH

HYS IISPCRT IIHYCT1 IIFCCT2 IIDFCSD SBDFM DI1DFT DI2DFB T3MDLI OS3

DTO PSLDTY PSRDPD POFDRN LSMDDM OA1DDY OA2FID OS1

FDD T2FTO OS2FCM TLDFDT SCLFDH SIMFT1 ADRFT2FT3ATMALAAHAALRAHRATI

ATDADOAHMAHTACC

BIT25-6TM and 7TM

SPL IISMSPH IISLSP IISH

HY0 IISPHY1 IIH0CRT IIH1CT1 IIHTCT2 IIFCCSD IIDFHT SB

DFM DI1DFT DI2DFB T3MLTD OS3DDS PSLDLI PSR

DTO POFDTY LSMDSO OA1SOD OA2DPD OS1DRN T2DDM OS2DDY TLDFID SCL

FDD SIMFTO ABEFCM ADRFDTFDHFT1FT2FT3FMSATMALAAHAALRAHRATI

ATDADOAHMAHTACC

BIT25 Heating

SPL SBSPH DI1SP DI2CM PSLHYS PSRTON POFTOF DSMPB LSMIT OA1DT OA2AR OS1CT TLDPF SCL

HSD SIMATM ADRALAAHAALRAHRATDADO


47


LAE CONTROLLER PARAMETER SETTINGS FOR CELSIUS

For LAE control model AR2-28 ONLY, ALL parameters with a formula

shown need to be converted for Celsius applications.

EXAMPLE:

If current SPL is set for 20 degrees F the formula is (X-32) / 1.8

(20-32) / 1.8 = -6.7 Celsius

AR2-28SCL 1C ADOSPL (X-32) / 1.8 AHMSPH (X-32) / 1.8 AHT (X-32) / 1.8SP (X-32) / 1.8 ACC

C-H IISMHYS (X) / 1.8 IISL (X-32) / 1.8CRT IISH (X-32) / 1.8CT1 IISP (X-32) / 1.8CT2 IIHY (X) / 1.8CSD IIFCDFM HDSDFT IIDFDH1 SBDH2 DSDH3 DSMDH4 DI2DH5 STTDH6 EDTDLI (X-32) / 1.8 LSM

DTO OA1DTY OA2DPD CDDRN INPDDM OS1 (X) / 1.8DDY T2FID OS2 (X) / 1.8

FDD (X-32) / 1.8 T3FTO OS3 (X) / 1.8FCM TLDFDT (X) / 1.8 TDSFDH (X) / 1.8 AVGFT1 SIMFT2 ADRFT3ATMALA (X-32) / 1.8AHA (X-32) / 1.8ALR (X) / 1.8AHR (X) / 1.8ATI

ATD

T TO CHANGE

TOOTOTTT T

EEEGEEGNGAAANAAANAHAAA

CHCHO

COOOOOTOTOOTOTOTOTOTOTTTT

SUBJECT

S

CTCECECECECECJE

CJEEJEBJ

UBUUBSUSUSUSSSS

TT

MMOA1OA1OA2OA2CDCDINPINPO

(X-32) / 1.8(X-32) /

TT (FDHFDHFT1FT1FT2FT2FTFTA


48



LAE Probe Temperature to Resistance Chart

Temperature Resistance

C F K-ohm

-40 -40 195.65-35 -31 148.17-30 -22 113.35-25 -13 87.56-20 -4 68.24-15 5 53.65-10 14 42.51-5 23 33.890 32 27.225 41 22.02

10 50 17.9315 59 14.6720 68 12.0825 77 10.0030 86 8.3235 95 6.9540 104 5.8345 113 4.9250 122 4.1655 131 3.5460 140 3.0165 149 2.5970 158 2.2375 167 1.9380 176 1.6785 185 1.4590 194 1.2795 203 1.15

100 212 0.97105 221 0.86110 230 0.76115 239 0.67120 248 0.60125 257 0.53

JECT TO C

HANGEEGEGNGAN

HHHHAHHHCHHHHCHCHCHCHCHCHCHCHCHCHO

COTO

T TCCCCTCCECCCCECEC

SUBJECECECECECECECECEC

JEBJUB

SUS

3.898927.2227.2222.0222.021717

777786869595

1

555560606565

Checking the probe resistance.

• Verify the probe resistance is accurate at the probe location.

• Use a calibrated thermometer to check the probe location

temperature (coil or air temperature).

• Disconnect the probe from the controller. The probe cannot

be plugged into the controller when measuring resistance.

• Use a calibrated Ohm meter to measure the resistance of the

probe

• The resistance of the probe should match the associated

temperature from the above table.

• Fill a cup full of ice water (use a lot of ice). Put the probe into

the ice bath, stir for 1 minute, then measure the resistance with a

calibrated Ohm meter. Make sure to keep the probe in the center

of the cup.

• The resistance of the probe should match the associated

temperature at 32°F / 0°C degrees as shown in the above

table.

Checking the controller display temperature accuracy.

• After verifying the probe resistance to the box temperature, plug

the probe into the controller and check the temperature display.

• The controller should display the associated temperature

from the above table

• Fill a cup full of ice water (use a lot of ice). Put the Ohm verified

probe in to the ice bath, stir for 1 minute. Make sure to keep the

probe in the center of the cup.

• The controller should display 32°F / 0°C.

Control version will vary with model and age of cabinet.

LAE:

t1 = Thermostat

t2 = Defrost

t3 = Display

49


DIAGNOSTIC FLOW CHART FOR DIXELL AND LAE ELECTRONIC CONTROLS

Concern: Electronic Control Display Temperature does not match the cabinet temperature

NOTE: The temperatures may reflect the refrigeration cycle determined by a set point and differential or it may show an average temperature.The temperatures are also effected by a defrost cycle and the open and closing of the door.The most accurate temperature on a cabinets operation is to verify the product temperature.

YES NO

NO YES

YES

NO

YES YES

NO NO YESNO

Change the control

NO YES

YESNO YES

NO

Replace the probe.

set point.

Check for a refrigeration issue, air flow blockage or ice on the evaporator coil.

Reposition the probe.Check for a bad compressor,

fans or wiring.

Is the probe touching the evaporator coil?

Is the cabinet cycling at a set pointand differential temperature?

Is the product at the correct temperature?

Is the controller calling for cooling?(The control's led indicator will be on next to the snowflake symbol)

Is the probe resistance correct?See checking probe resistance chart.

Replace the controller

Is there continuity across the controller compressor relay?

all the fans running?

Is the product at the correct temperature?

Is the control set at the correct set point?See changing / checking the set point.

Is the compressor and

working correctly!!!The cabinet is


50


PRODUCT ADVISEMENT

LAE ELECTRONIC CONTROL CHANGE FROM MODEL AR1 AND MODEL AR2 TO MODEL BR1.

REASON FOR ADVISEMENT: LAE Electronic Control model update will change the display, connecting cable, module,

wiring and programming*.

*Control is pre-programmed from the factory. New control is Universal voltage

BR1 DISPLAY, CABLE AND MODULE CONNECTIONSAR2 DISPLAY, CABLE AND MODULE CONNECTIONS

AR21 LINE IN

2 AUX 2

6 AUX 1

7 DEF

8 FAN

9 LINE IN

10 OR 11 COMP

14-19 NEUTRAL

26 T3

27 T1 (COMMON)

27 T3 (COMMON)

28 T1

29 T2 (common)

30 T2

31 DOOR (DI1)

32 DI1 (COMMON)

32 DI2 (COMMON)

33 DI2

BR11 LINE IN

2 AUX 2

4 AUX 1

5 OR 6 DEF

7 FAN

8 OR 9 LINE IN

10 OR 11 COMP

13-18 NEUTRAL

23 T3

21 T1 (COMMON)

24 T3 (COMMON)

20 T1

21 T2 (COMMON)

22 T225 DOOR (DI1)27 DI1

(COMMON)27 DI2

(COMMON)26 DI2


TRUE TEMPERATURE CONTROLS OPERATION WWW TRUEMFG …

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