GDM-26
ELSTAT TRAINING BOOKLET
GDM SERIES COOLER EQUIPPED WITH EMS (ELSTAT) CONTROL
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
2
ELSTAT SEQUENCE OF OPERATION
Once the cabinet is plugged in, the ELSTAT control will ash "888" and then
go through a parameter check. Once completed, the control will do a "soft
start". Lights come on rst, 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 o at the predetermined temp (Model specic).
The whole time the controller is on it is learning the customer trac. 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 trac is nonexistent. It will display (---). It cycles the
compressor to hold about 50˚F. It shuts the lights o and cycles the evap
fan motor. It will hold this pattern until roughly 2 hours before customer
trac is predicted to start. The controller will then switch into the "use"
mode. Cycling the compressor on and o based on temperature (Approx
36˚F to 38˚F product temp). Running lights continuously. The controller will
then cycle between these two modes.
3
GDM SERIES COOLER EQUIPPED WITH EMS (ELSTAT) CONTROL
ELSTAT COMPONENTS
Controller
Evaporator Coil
Evaporator Fan
Airflow
Probe Location 1
GDM-10 through GDM-37
Probe is in return air mounted by the evaporator fan motor.
4
2001 East Terra Lane • O'Fallon, MO. 63366 • ph. 636.240.2400 • toll free 800. 325.6152 • service@truemfg.com
Elstat
1
9
2
8
7
4
6
5
ProbeTransformer
Evaporator Coil
Airflow
3
Evaporator Fan
Elstat
1
9
2
8
7
4
6
5
3
Probe Location 2
GDM-45 to GDM-72
Probe is in the discharge air stream
O of the Evaporator Coil
GDM SERIES COOLER EQUIPPED WITH EMS (ELSTAT) CONTROL
FRONT VIEW OF ELSTAT
Perishable Mode Light
Waterdrops Snowake Up/Down Key
2001 East Terra Lane • O'Fallon, MO. 63366 • ph. 636.240.2400 • toll free 800. 325.6152 • service@truemfg.com
5
GDM SERIES COOLER EQUIPPED WITH EMS (ELSTAT) CONTROL
REAR VIEW OF CONTROLLER
1. 2. 3. 4.
5. 6. 7. 8. 9.
NO. NAME
1. Line In
2. Lights
3. Not Used
4. Appliance Sensor
5. Compressor
6. Fan (s)
7. 12 Vac
8. Not Used
9. Not Used
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2001 East Terra Lane • O'Fallon, MO. 63366 • ph. 636.240.2400 • toll free 800. 325.6152 • service@truemfg.com
GDM SERIES COOLER EQUIPPED WITH EMS (ELSTAT) CONTROL
HOW?
WHAT?
HOW?
FREQUENTLY ASKED QUESTIONS
Can the Elstat come out of the "Stand by" mode before its predetermined time?
No. If the motion sensor is set o during the "Stand by" mode the control will automatically
turn the lights on, however it will stay in stand by mode.
Can the Elstat be set up for continuous use and not go into the "Stand by" mode?
Yes . 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.
NOTE: There is no ability to set lights on all the time.
Can lights be set to stay on at all times?
No. Elstat controller does not have this capability. Lights will always turn o in "stand by"
Mode.
How do I put controller into Perishable mode?
• Perishable mode is used when anything perishable is being stored in the cabinet.
• In perishable mode, cabinet will maintain a 36°F-38°F product temperature. The
cabinet will not go into standby mode.
NOTE: All Energy Star cabinets are shipped in perishable mode
• Press the set button key (looks like a snow flake): the screen should show PAS
• You will now need to enter the key dance:
• Press the snow flake key 3 beeps
• Press the up arrow key 2 beeps
• Press the down arrow key1 beep
• Press the water drops key 4 beeps (should show display of "PS")
• Now press and hold down the snow flake key until the screen shows PEr and 00.
• Next press and hold the up arrow key until the screen shows PEr and 01.
• Wait until controller reads "USE"; unplug the cabinet and plug it back in. At this
point the red LED in center of the control should be “on” which means that the
control is in perishable mode.
How do I perform a Half reset, and what is it? Half reset clears any of the learning memory.
• Push the set button key (looks like a snow flake) the screen should show PAS
• You will now need to enter the key dance
• Press the snow flake key 3 beeps
• Press the up arrow key 2 beeps
• Press the down arrow key1 beep
• Press the water drops key4 beeps (should show display of "PS")
• Press and hold the down arrow key until you view HR
• Press the snow flake key (display should show PAS)
• Re enter key dance and the Half Reset is complete.
2001 East Terra Lane • O'Fallon, MO. 63366 • ph. 636.240.2400 • toll free 800. 325.6152 • service@truemfg.com
7
GDM SERIES COOLER EQUIPPED WITH EMS (ELSTAT) CONTROL
NORMAL OPERATING CODES
Normal operating mode. Cabinet
should be holding proper product
temperature.
Units is in defrost . Compressor has
been shut o and evaporator fan
motor is running to clear any ice
that may have accumulated. This is a
predetermined program function.
FAULT CODES/ TROUBLESHOOTING
Freeze up protection. This unit has
gone down below the minimum
temperature Set Point.
Possible Problems Action to take
Compressor not shutting o Check compressor. Relay at
controller
Faulty Probe Ohm out evaporator probe
Parameters have been
changed
Check parameter list
Possible Problems Action to take
Unit is not cooling Check the Refrigeration System
Faulty Probe Ohm out evaporator probe
Faulty Controller Bypass control to see if system will
Parameters have been
changed
Units is in Standby mode. Control
will cycle the unit at a warmer
temperature. Lights will be o.
Refrigeration System Failure. The unit
has not satised the set point in the
amount of time allowed.
run
Check the parameter list
Power supply voltage is low.
Possible Problems Action to take
Poor 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 Controller Bypass control to see if system will run
Faulty Elstat If 12V is present at connector 7, replace
Elstat
Probe failure
Possible Problems Action to take
Connector o at controller Verify that connector 4 is in place
(see page 2)
Probe is open Ohm out probe
Probe is shorted Ohm out probe
Probe wire is open Ohm out probe wire
Power supply voltage is too high.
Possible Problems Action to take
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 Elstat If 12V is present at connector 7, replace
Elstat.
Elstat Probes by the evaporator motor GDM-10 to 33 probes in air
stream GDM-35 to 72
Value Ohms
32° 32,000 Ohms
70° 12,000 Ohms
80° 9,300 Ohms
85° 8,500 Ohms
90° 7,000 Ohms
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2001 East Terra Lane • O'Fallon, MO. 63366 • ph. 636.240.2400 • toll free 800. 325.6152 • service@truemfg.com
GDM SERIES COOLER EQUIPPED WITH EMS (ELSTAT) CONTROL
TROUBLESHOOTING GUIDE
TROUBLESHOOTING GUIDE
(Please note this does not cover any and all situations)
Complaint Possible Cause Repair
Cabinet not cold enough 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
location. Elstat control may be
going in standby mode.
3. Unit was in a previous
location.
Warm Product 1. Unit in a unpredictable
location. Elstat control may be
going into standby mode.
2. Compressor not running. 2. Check for out put voltage
3. Compressor running. 3. Follow refrigeration trouble
2. Move cabinet or put into
Perishable mode.
3. Perform half reset.
1. Move cabinet or put into
Perishable mode.
at controller. If good follow
compressor diagnosis.
shooting guides.
4. Unit in standby mode.
Unit displaying a
temperature instead of
“use.”
2001 East Terra Lane • O'Fallon, MO. 63366 • ph. 636.240.2400 • toll free 800. 325.6152 • service@truemfg.com
1. Unit recently worked
on. Parameters have been
changed.
1. Reset the DIS parameter to
“0”.
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2001 East Terra Lane • O'Fallon, MO. 63366 • ph. 636.240.2400 • toll free 800. 325.6152 • service@truemfg.com
JY • 2/2013
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