True Manufacturing Company Swing Glass Door Merchandiser Refrigerator Gdm 26 Users Manual Elstat Training Booklet

GDM-26 to the manual 69e7bfc4-9823-42fc-b9c6-362f5d3d8f24

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ELSTAT TRAINING BOOKLET
GDM SERIES COOLER EQUIPPED WITH EMS (ELSTAT) CONTROL

GDM-26

TABLE OF CONTENTS
· ELSTAT SEQUENCE OF OPERATION
· ELSTAT COMPONENTS
· FRONT VIEW OF ELSTAT
· REAR VIEW OF CONTROLLER
· FREQUENTLY ASKED QUESTIONS (FAQ)
· NORMAL OPERATING CODES
· FAULT CODES/ TROUBLESHOOTING
· TROUBLESHOOTING GUIDE
· PARAMETERS

2

ELSTAT SEQUENCE OF OPERATION
Once the cabinet is plugged in, the ELSTAT control will flash "888" and then
go through a parameter check. Once completed, the control will do a "soft
start". Lights come on first, approximately 30 seconds later the compressor
will start. Approximately 30 seconds from the compressor start up, the evap
motor will start. The control will display "Use". The control will then cycle
the compressor on and off at the predetermined temp (Model specific).
The whole time the controller is on it is learning the customer traffic. Once
enough data has been accumulated the controller will now cycle between
two modes. "Standby" and "Use". In the standby mode the controller
predicts that customer traffic is nonexistent. It will display (---). It cycles the
compressor to hold about 50˚F. It shuts the lights off and cycles the evap
fan motor. It will hold this pattern until roughly 2 hours before customer
traffic is predicted to start. The controller will then switch into the "use"
mode. Cycling the compressor on and off based on temperature (Approx
36˚F to 38˚F product temp). Running lights continuously. The controller will
then cycle between these two modes.

3

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Controller

Transformer

Probe

Evaporator Fan

Evaporator Coil

Evaporator Fan

Evaporator Coil

Airflow

Airflow
Elstat
9

Elstat

1

8

2

3

9

1

8

7

2

4

3

6

7

5

4

6

Probe Location 2

GDM-10 through GDM-37

GDM-45 to GDM-72

Probe is in return air mounted by the evaporator fan motor.

Probe is in the discharge air stream
Off of the Evaporator Coil

4


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Probe Location 1

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Perishable Mode Light

Waterdrops

Snowflake

Up/Down Key


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1.
2.
3.
4.
5.
6.
7.
8.
9.

6











/".&
Line In
Lights
Not Used
Appliance Sensor
Compressor
Fan (s)
12 Vac
Not Used
Not Used


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FREQUENTLY ASKED QUESTIONS
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/P If the motion sensor is set off during the "Stand by" mode the control will automatically
turn the lights on, however it will stay in stand by mode.
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mode. The lights will still cycle (like stand by mode) when cabinet doesn't see activity.
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/P Elstat controller does not have this capability. Lights will always turn off in "stand by"
Mode.
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cabinet will not go into standby mode.

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point the red LED in center of the control should be “on” which means that the
control is in perishable mode.

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Normal operating mode. Cabinet
should be holding proper product
temperature.

Units is in Standby mode. Control
will cycle the unit at a warmer
temperature. Lights will be off.

Units is in defrost . Compressor has
been shut off and evaporator fan
motor is running to clear any ice
that may have accumulated. This is a
predetermined program function.

'"6-5
$0%&4
5306#-&4)005*/(
Freeze up protection. This unit has
gone down below the minimum
temperature Set Point.

Refrigeration System Failure. The unit
has not satisfied the set point in the
amount of time allowed.

1PTTJCMF
1SPCMFNT

"DUJPO
UP
UBLF

1PTTJCMF
1SPCMFNT

Compressor not shutting off

Check compressor. Relay at
controller

Unit is not cooling

Check the Refrigeration System

Faulty Probe

Ohm out evaporator probe

Faulty Probe

Ohm out evaporator probe

Faulty Controller

Parameters have been
changed

Check parameter list

Bypass control to see if system will
run

Parameters have been
changed

Check the parameter list

Power supply voltage is low.

"DUJPO
UP
UBLF

Power supply voltage is too high.

1PTTJCMF
1SPCMFNT

"DUJPO
UP
UBLF

1PTTJCMF
1SPCMFNT

"DUJPO
UP
UBLF

Poor voltage at outlet

Verify proper voltage to cabinet

High voltage at outlet

Verify proper voltage to cabinet

Faulty Transformer

Verify 120V to transformer. Check for
12V on secondary. Connector 7
(see page 2)

Faulty Transformer

Verify 120V to transformer. Check for
12V on secondary. Connector 7
(see page 2)

Faulty Controller

Bypass control to see if system will run

Faulty Elstat

Faulty Elstat

If 12V is present at connector 7, replace
Elstat

If 12V is present at connector 7, replace
Elstat.

Probe failure
Elstat Probes by the evaporator motor GDM-10 to 33 probes in air
stream GDM-35 to 72

8

1PTTJCMF
1SPCMFNT

"DUJPO
UP
UBLF

7BMVF

0INT

Connector off at controller

Verify that connector 4 is in place
(see page 2)

¡

32,000 Ohms

¡

12,000 Ohms

Probe is open

Ohm out probe

¡

9,300 Ohms

Probe is shorted

Ohm out probe

¡

8,500 Ohms

Probe wire is open

Ohm out probe wire

¡

7,000 Ohms


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(Please note this does not cover any and all situations)
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1. No product in cabinet.

2. Unit in a unpredictable
location. Elstat control may be
going in standby mode.

8BSN
1SPEVDU

3FQBJS
1. Load cabinet Elstat is
equipped with a anti-short
cycle that can make the unit
run warm with no product.
2. Move cabinet or put into
Perishable mode.

3. Unit was in a previous
location.

3. Perform half reset.

1. Unit in a unpredictable
location. Elstat control may be
going into standby mode.

1. Move cabinet or put into
Perishable mode.

2. Compressor not running.

2. Check for out put voltage
at controller. If good follow
compressor diagnosis.

3. Compressor running.

3. Follow refrigeration trouble
shooting guides.

4. Unit in standby mode.

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UFNQFSBUVSF
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iVTFw

1. Unit recently worked
on. Parameters have been
changed.

1. Reset the DIS parameter to
“0”.


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9



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