Gram ECO Service-Handbuch

765041642 1

Operating- and servicemanual

Gram Eco / Superior

765041642 2

Content

MPC 46 and the menus. 3

When servicing the product. 4

Start-up sequence 4

Defrosting 7

Temperature control and regulation: 7

Keylock 8

Error codes 8

Reminder of cleaning the condenser air filter 8

Resetting the FILTER alarm 8

Compressor counter time setting 9

Reset to factory setting 9

User menu 10

Visual and acoustic settings 12

Settings for running cycle 13

Test program for relays and electrical components 15

Display of current sensor inputs 16

Reset the controller to factory setting 16

Parameter settings in commercial program variants 17

Changing door hinge side. 18

Plug connections onboard the controller 28

765041642 3

MPC 46 and the menus.

The menus are divided up in two main menus.

A menu for presentations of values in the display and

settings for alarms parameters, and another menu for

technical, practical or physical settings to a normal

refrigerator or freezer.

In each main menu there exist smaller submenus.

These submenus are divided up in specific menu for kind of

cycles as defrosting or the settings for running the

evaporator fan.

765041642 4

When servicing the product.

Make sure the appliance is switched off at the socket before service is performed on electrical

parts. It is not sufficient to switch off the cabinet by the START/STOP key as there will still be

voltage to some electrical parts of the cabinet.

Start-up sequence

When the product switches ON, the software is loaded into the MPC-46.

The display shows multiple informations, see below:

TextDisplay

Second0‐3:

Softwareisloaded

intoMPC‐46on

start‐up



Allsegmentslightupwhite.Control,iseverythingok?

Thedisplayhasrecognizedversion3.0andawaitsmoreinformation….



Approx.3rdsecond

and3‐4seconds

forward:



NowtheMaxidisplayrecognizesprogrammevariantF3+version3.0.

Thedisplayrecognizesthattheproductisequippedwithone

compressor.



Approx.7thsecond

and3‐4seconds

forward:



Thedisplayrecognizeswhichcontrollampsareneededaccordingto

theprogrammevariantF3+,andtheappropriatelampsarelit.The

versionnumberisdisplayed.



Approx.10th

secondand3‐4

secondsforward:



Allcontrollampsareturnedoff,exceptthecompressorlamp.The

largedisplayisdisplayedreadyforuse.



765041642 5

Start up after power on – hot product.

On hot products or if the product has just been unpacked and connected to mains power, the temperature is

so high that the defrosting cycle is cancelled, and refigeration starts immediately.

Because the product has not been running before, the setpoint is displayed and not the current temperature.

TextDisplay

Normaloperation

afterstart‐upphase

hasended



Only+5°Cisdisplayed,whichisthestandardsetpointfora

refrigerator.



Situation1:

Refrigerator



Lessthanasecond

latercompressor

starts.





Thecompressorstarts.Thecoloriscyan,andlightsconstantly.



Situation2:

Extended

refigerator



Lessthanasecond

latercompressor

starts.



Thecompressorstarts.Thecoloriscyan,andlightsconstantly.



Situation3:

Freezer



Lessthanasecond

latercompressor

starts.



Standardsetpointforafreezeris‐18°C.Thecompressorstarts.The

coloriscyan,andlightsconstantly.



765041642 6

Start up after power on – cold product.

On cold products, or if the product has been turned off for a short while, and the evaporator temperature is

still below the freezing point, a defrosting cycle will be activated, and refrigeration starts later.

Because the product has not been running before, the setpoint is displayed and not the current temperature.

TekstMaxiDisplay

Normaloperation

afterstart‐upphase

hasended



Only+5°Cisdisplayed,whichisthestandardsetpointfora

refrigerator.



Situation1:

Refrigerator



Lessthanasecond

later,defrosting

starts,andusesthe

evaporatorfanfor

thedefrosting

process.



Becausedefrostingisrunning,butwithevaoratorfan,bothcontrol

lampsarelit.



Defrostmode:Air(Evaporatorfanrunning100%)



Situation2:

Extended

refrigerator



Lessthanasecond

later,defrosting

starts,andusesthe

evaporatorfanfor

thedefrosting

process.



Becausedefrostingisrunning,butwithevaoratorfan,bothcontrol

lampsarelit.



Defrostmode:Automatic(Controllerselectsacc.tosetpointwhether

fanorelectricalheateristobeused.)Ifelectricaldefrostingis

selected,thecontrollampforfanwillnotlightup



Situation3:

Freezer



Lessthanasecond

later,defrosting

starts,andusesthe

electricalheater.



Defrostmode:Electrical(Heaterbelowevaporator)



765041642 7

Defrosting

The defrosting cycle runs 4 times each day. If the cabinet is operating under severe load (frequent door

opening and frequent replenishment) manual defrosting can become necessary.

To start manual defrosting: Push for more than 3 seconds.

Refrigerator: Control lamps for fan and defrosting light up.

Extended refrigerator: Control lamp for defrosting light up, and lamp for fan light up depending on

setpoint.

Freezer: Control lamp for defrosting light up.

Shortly after defrosting has ended, the compressor starts, and the compressor symbol lights blue.

The number defrosts can be changed. See chapter ”User menu”.

Temperature control and regulation:

 Keep pressed. When doing this, the setpoint temperature is displayed. While is kept

pressed, the setpoint can be changed by pressing or .

 Each time or is pressed the temperature will change one degree. The new value flashes in

the display

 When the required setpoint has been set, let go of the keys, a short beep sounds, and the settings

are saved.

P +

P P

765041642 8

Keylock

The keypad can be locked by simultaneously pushing for more than 5 seconds.

lights to indicate that the keys are locked, and a short beep sounds. Now it is not possible to use the

keys for temperature setting etc.

The same code is to be used for unlocking the keypad again.

Error codes

The door is open. The alarm system is activated, if the door is not closed within a certain time. The user

is reminded that the door is not properly closed.

Cabinet sensor error. In the meantime the cabinet itself will maintain the set temperature by the

memory of the controller. Service assistance is required.

Evaporator sensor error.

The cabinet will keep running until the error has been mended. Service assistance is required.

F3/F4

Condenser sensor error. The cabinet will keep running, until the error has been mended. Service

assistance is required.

Applies only to cabinets with built-in compressor.

Indicates that the condenser temperature is too high. The cause might be a clogged condenser, or too

high ambient temperature.

If the condenser or air filter needs cleaning, the cabinet must be disconnected at the mains power.

Cleaning of the condenser is done with a brush or a vacuum cleaner.

The air filter can be removed and cleaned in a dishwasher at max. 50C.

If the ambient temperature is too high, the placement of the cabinet might be wrong, and an alternative

place should be found. Ventilation might help.

If this does not help, request service assistance.

Applies only to cabinets with built-in compressor.

Reminder of cleaning the condenser air filter

After 600 compressor running hours the filter must be cleaned and it is indicated by warning lights: FILTER

If the cleaning is not completed within 650 hours, the warnings continue, and an acoustic alarm sounds.

Resetting the FILTER alarm

After cleaning the air filter, the controller must be reset to remove the alarms.

It can only be reset by using a certain key combination.

 Push three times followed by pushing three times. FILTER alarm will disappear after 1

minute.

765041642 9

Compressor counter time setting

The default time value for the compressor counter is 600 hours.

The value can be changed i intervals of 50 hours.

Minimum value = 200 hours

Maximum value = 2000 hours

To change the value, proceed as follows:

 Keep keys and pressed for 3 seconds.

 The FILTER indicator flashes, and the value 600 is displayed.

 Press the key, until the right value is displayed.

 Press to confirm the setting.

 The FILTER indicator is turned off.

Reset to factory setting

To reset the controller to factory setting:

 Press + + for at least 5 seconds.

 RES flashes in the display.

 Press to confirm, RES lights up for 2-3 seconds, and the buzzer gives a short signal.

 The controller then returns to normal display.

765041642 10

User menu

Push on and buttons at the same time in more than 3 sec. and the first Setup menu appears in the

display.

With and buttons its possible to look through each menu items in the “User menu”. Push on button

to activate the desired item and adjust the setting with and buttons.

To confirm the new setting, push button. Leave the menu item and user menu with the button.

Menu access P+1



 

Dry refrigeration DC Activation of dry refrigeration. [ON/OFF]

Rapid thaw UF Activation of rapid thaw. [ON/OFF]

Local alarm setting LAL LHL [° C] Setting the upper alarm limit. At alarm, the display shows: [

2].

LLL [° C] Setting the lower alarm limit. At alarm, the display shows: [

3].

Lhd [min.] Time delay for the upper alarm limit.

LLd [min.] Time delay for the lower alarm limit.

DA On/off Activation of local door alarm. At alarm, the display shows: [

1]. [on/off]

DAd [min.] Time delay for the door alarm.

BU On/off Activation of buzzer. The buzzer sounds at alarms [ A1], [

2], [

3].

[1=on / 0=off]

External alarm

setting

EAL EhL [° C] Setting the upper alarm limit At alarm, the display shows: [

4].

ELL [° C] Setting the lower alarm limit . At alarm, the display shows: [

5].

Ehd [min.] Time delay for upper alarm.

ELd [min.] Time delay for lower alarm.

DA On/off Activation of local door alarm. At alarm, the display shows: [

1]. [on/off]

DAd [min.] Time delay for the door alarm.

BU On/off Activation of buzzer. The buzzer sounds at alarms [ A1], [

4], [

5].

[1=on / 0=off]

ALL Activation of escorting alarm limits. [FAS]= fixed limits / [ESC] = limits following

the setpoint.

DEF Number of defrosts in 24 hours.

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