True Manufacturing Company Beverage Dispenser GDM 26 User Manual

ELSTAT TRAINING BOOKLET

GDM SERIES COOLER EQUIPPED WITH EMS (ELSTAT) CONTROL

GDM-26

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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.

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Controller

Transformer

Probe

Evaporator Fan

Evaporator Coil

Airﬂow

Elstat

Probe Location 1

Probe Location 2

GDM-10 through GDM-37

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

GDM-45 to GDM-72

Probe is in the discharge air stream

Oﬀ of the Evaporator Coil

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Perishable Mode Light

Waterdrops

Snowﬂake

Up/Down Key

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ꢈꢅ

ꢊꢅ

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Line In

Lights

Not Used

Appliance Sensor

Compressor

Fan (s)

12 Vac

Not Used

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FREQUENTLY ASKED QUESTIONS

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/Pꢅ 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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:FTꢅ The control can be set into perishable mode. This would shut down the "stand by"

mode. The lights will still cycle (like stand by mode) when cabinet doesn't see activity.

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/Pꢅ 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.

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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.

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Unit is not cooling

Faulty Probe

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Compressor not shutting oﬀ

Check compressor. Relay at

controller

Check the Refrigeration System

Ohm out evaporator probe

Faulty Probe

Ohm out evaporator probe

Check parameter list

Faulty Controller

Bypass control to see if system will

run

Parameters have been

changed

Parameters have been

changed

Check the parameter list

Power supply voltage is low.

Power supply voltage is too high.

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High voltage at outlet

Faulty Transformer

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Poor voltage at outlet

Faulty Transformer

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Verify proper voltage to cabinet

Verify 120V to transformer. Check for

12V on secondary. Connector 7

(see page 2)

Verify 120V to transformer. Check for

12V on secondary. Connector 7

(see page 2)

Faulty Elstat

If 12V is present at connector 7, replace

Elstat.

Faulty Controller

Faulty Elstat

Bypass control to see if system will run

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

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0INT

Connector oﬀ at controller Verify that connector 4 is in place

(see page 2)

32,000 Ohms

12,000 Ohms

9,300 Ohms

8,500 Ohms

7,000 Ohms

ꢏꢍ¡

Probe is open

Ohm out probe

ꢋꢍ¡

Probe is shorted

Probe wire is open

Ohm out probe

ꢋꢐ¡

Ohm out probe wire

ꢑꢍ¡

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(Please note this does not cover any and all situations)

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1. No product in cabinet.

1. Load cabinet Elstat is

equipped with a anti-short

cycle that can make the unit

run warm with no product.

2. Unit in a unpredictable

2. Move cabinet or put into

location. Elstat control may be Perishable mode.

going in standby mode.

3. Unit was in a previous

location.

3. Perform half reset.

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1. Unit in a unpredictable

location. Elstat control may be Perishable mode.

going into standby mode.

1. Move cabinet or put into

2. Compressor not running.

3. Compressor running.

4. Unit in standby mode.

2. Check for out put voltage

at controller. If good follow

compressor diagnosis.

3. Follow refrigeration trouble

shooting guides.

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1. Unit recently worked

on. Parameters have been

changed.

1. Reset the DIS parameter to

“0”.

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