Maxx Cold MXSR-23FD User manual

7/16/2018 PK
SERVICE, INSTALLATION AND INSTRUCTION MANUAL
MANUEL D’ENTRETIEN, D’INSTALLATION ET D’UTILISATION
MANUAL DE INSTRUCCIONES, INSTALACIÓN Y MANTENIMIENTO
For AUTHORIZED PARTS or TECHNICAL SERVICE, please contact｜Pour les PIÈCES AUTORISÉES ou un
SERVICE TECHNIQUE, veuillez composer le｜Para PIEZAS AUTORIZADAS o SERVICIO TÉCNICO, llame al
1-877-368-2797 or｜ou visiter le site｜o visite [e-mail]
3355 Enterprise Avenue, Suite 160, Fort Lauderdale, FL 33331 USA
Phone｜Téléphone ｜Teléfono: [phone]
Website｜Site Web｜Sitio Web: MaxximumFoodService.com
SOLID DOOR｜PORTE PLEINE｜PUERTA SÓLIDA GLASS DOOR｜PORTE EN VERRE｜PUERTA DE VIDRIO
MXSR-23FD MXSR-23GD
MXSR-49FD MXSR-49GD
SELECT SERIES REACH-IN REFRIGERATORS｜RÉFRIGÉRATEURS ARMOIRES DE LA SÉRIE SELECT｜
SERIE SELECTA DE REFRIGERADORES DE ACCESO DIRECTO
PLEASE READ CAREFULLY ｜ VEUILLEZ LIRE AVEC ATTENTION ｜ POR FAVOR, LEER DETENIDAMENTE

Page 2of 67
TABLE of CONTENTS
SERIAL NUMBER INFORMATION.............................................................................................................................................3
REFRIGERATOR SAFETY ...........................................................................................................................................................4
IMPORTANT SAFEGUARDS .......................................................................................................................................................5
DIMENSIONS ................................................................................................................................................................................7
TECHNICAL INFORMATION......................................................................................................................................................7
RECEIVINGAND INSPECTING THE EQUIPMENT.................................................................................................................8
INTRODUCTION .........................................................................................................................................................................8
COMPONENT INFORMATION .................................................................................................................................................9
REFRIGERATOR INSTALLATION............................................................................................................................................10
Remove Packaging Materials....................................................................................................................................................10
Location Requirements..............................................................................................................................................................10
Inside cabinet:............................................................................................................................................................................10
Outside cabinet:.........................................................................................................................................................................10
Installation Clearance................................................................................................................................................................11
Leveling.....................................................................................................................................................................................11
Stabilizing..................................................................................................................................................................................11
Electrical Connection ................................................................................................................................................................11
OPERATION (Units Made Prior to July 2018).............................................................................................................................12
Refrigerated cycle......................................................................................................................................................................12
Power Switch:............................................................................................................................................................................12
SOLID-STATE THERMOSTAT DESCRIPTIONS (Units Made Prior to July 2018) ..................................................................12
1. FRONT PANEL COMMANDS ............................................................................................................................................12
2. MAIN FUNCTIONS.............................................................................................................................................................13
3. ALARM SIGNALLING........................................................................................................................................................13
OPERATION (Units Made After July 2018).................................................................................................................................14
Refrigerated cycle......................................................................................................................................................................14
Power Switch:............................................................................................................................................................................14
SOLID-STATE THERMOSTAT DESCRIPTIONS (Units Made After July 2018) ......................................................................14
1. FRONT PANEL COMMANDS. ...........................................................................................................................................14
2. MAIN FUNCTIONS.............................................................................................................................................................15
3. ALARM SIGNALLING........................................................................................................................................................15
CLEANINGAND MAINTENANCE...........................................................................................................................................16
Exterior and Interior Cleaning of Refrigerators.........................................................................................................................16
Cleaning the Condenser Coil.....................................................................................................................................................16
Stainless Steel Care and Cleaning.............................................................................................................................................17
Gasket Maintenance ..................................................................................................................................................................17
Doors/Hinges.............................................................................................................................................................................17
Drain Maintenance ....................................................................................................................................................................17
TROUBLESHOOTING GUIDE ................................................................................................................................................18
TROUBLESHOOTING................................................................................................................................................................18
WIRING DIAGRAMS..................................................................................................................................................................19
PARTS ...........................................................................................................................................................................................23

Page 3of 67
READ THIS MANUAL IN ITS ENTIRETY
TO HELP FAMILIARIZE YOURSELF WITH YOUR NEW EQUIPMENT BEFORE PROCEEDING.
We have provided many important safety messages in this manual.
Always read and obey all safety messages.
Understanding of safety messages will assist in alerting you to potential hazards, as well as tell you
how to reduce the chance of injury. Follow the instructions as outlined in this manual.
VISIT OUR WEBSITE for the MOST UP-TO-DATE VERSION of this MANUAL.
http://www.maxximumfoodservice.com/
Fill out and return the enclosed warranty postcard or visit our website/warranty registration.
Keep the dated proof of purchase invoice which establishes the appliance's warranty period.
SERIAL #:______________________________________________________________________________________________
INSTALL DATE:______________________ MODEL #:__________________________________________________
SERIAL NUMBER INFORMATION
lThe serial number of all self-contained refrigerators is located inside the unit on the left hand side near the top on the
wall.
lAlways have the serial number of your unit available when calling for parts or service.
lThis manual covers standard units only. If you have a custom unit, consult customer service department at the
number listed on cover page.
Due to periodic changes in designs, methods, procedures, policies and regulations, the contents of this manual
are subject to change without notice. While we exercise good faith efforts to provide information that is accurate,
we are not responsible for errors or omissions in information provided or conclusions reached as a result of
using this reference manual. By using the information provided, the user assumes all risks in connection with
such use.

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REFRIGERATOR SAFETY
Always readand obeyallsafetymessages.
Thisis the SafetyAlertSymbol. Thissymbolalerts youto potentialhazardsthatcaninjure or kill you
and others. All safety messages will follow the Safety Alert Symbol and either thewords
“DANGER”,
“WARNING”OR“CAUTION”.
DANGER
DANGER means that failure to heed this safety statement may result in Death or Severe Personnel Injury .
WARNING
WARNING means that failure to heed this safety statement may result in extensive product damage, serious
personal injury, or death.
CAUTION
CAUTION means that failure to heed this safety statement may result in minor or moderate personal injury, or
property or equipment damage.
Allsafetymessageswillalertyoutowhatthepotentialhazardis,tellyouhowtoreducethechance ofinjury, andlet you
knowwhat can happen if theinstructionsarenot followed.
NOTE: IMPORTANT SAFETY INSTRUCTIONS
WARNING Toreducetheriskoffire,electricshockorinjury,whenusingyour refrigerator ,followthese
basic precautions:
l Pluginto grounded3-prongoutlet.
l Donotremovegrounding prong.
l Do not use anadapter.
l Do not use anextensioncord.
l Disconnectpowerbeforecleaning.
l Disconnectpowerbeforeservicing.
l Use 2 or more people to move andinstall refrigerator.
SAVE THESE INSTRUCTIONS

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IMPORTANT SAFEGUARDS
Beforethe refrigerator isused,itmustbeproperlypositionedandinstalledas
described in thismanual,so read themanualcarefully. Westronglyrecommend that
you have a professional install your new machine. The warranty may be affected or
voided by an incorrect installation. To reduce the risk of fire, electrical shock or
injury when usingthe
refrigerator ,followbasicprecautions,includingthe following:
DANGER
• It is recommended that a separate circuit, serving only your refrigerator , be provided. Use receptaclesthatcannot
beturned offbya switchor pull chain.
•Please ensure that the required voltage is being supplied at all times.
•The unit should be plugged into a grounded and properly-sized electrical outlet with appropriate over-current
protection.
•Ensure unit is not resting on or against the electrical cord.
•
Donot connector disconnectthe electric plugwhenyour handsare wet.
•
Never unplug the refrigerator by pulling on the power cord. Always grip the plug firmly and pull straightout from
the outlet.
•
Never clean refrigerator parts with flammable fluids. Do not store or use gasoline or other flammablevaporsand
liquids in the vicinityofthisoranyotherappliance.Thefumescancreate afirehazardorexplosion.
•
Beforeproceedingwithcleaningandmaintenanceoperations,makesurethe powerlineofthe unitis disconnected.
•
Unplug the refrigerator or disconnect power before cleaning or servicing. Failure to do so can resultin electrical
shockor death.
•If the unit is not in use for a long period of time, best to unplug the unit from the outlet.
•After unplugging the unit, wait at least 10 minutes before plugging it back in. Failure to do so could cause damage to
the compressor.
•If the power cuts off, wait at least 5 minutes before turning the unit on to avoid damage to the compressor.
•
Donotattempttorepairorreplaceanypartofyour refrigerator unlessitisspecificallyrecommended inthis manual.A
qualifiedtechnician shoulddoallother servicing or repairs.
WARNING
• Use two or more people to move and install refrigerator. Failure to do so can result in back or other injury.
•This refrigerator must be properly installed and located in accordance with the Installation Instructions before it is
used.
•Do not touch the cold surfaces in the refrigerator compartment when hands are damp or wet. Skin may stick to these
extremely cold surfaces.
•Setting temperature controls to the ZERO (0) position does not remove power to the light circuit, perimeter heaters, or
evaporator fans.
•
To ensure proper ventilation for your refrigerator , choose a well-ventilated area with temperatures above 50ºF
(10ºC) and below 100ºF (38ºC). This unit MUST be installed in an area protected from the elements, such as
wind, rain,watersprayordrips.
•
The refrigerator shouldnot be locatednextto ovens,grills or other sourcesof high heat.
•
It is important for the refrigerator to be level for proper operation. You may need to make adjustmentstolevelit.
•
Removethe packingmaterials and cleanthe refrigerator before using.
•
Donot usethis apparatusforother than its intendedpurpose.

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IMPORTANT SAFEGUARDS (cont.)
Electrical Connection
Do not, under any circumstances, cut or remove the third (ground) prong from the power cord. For personal safety,
this appliance must be properly grounded. The power cord of this appliance is equipped with a 3-prong grounding
plug that mates with a standard 3-prong grounding wall outlet to minimize the possibility of electric shock hazard from
the appliance. Have the wall outlet andcircuit checkedbya qualified electriciantomakesurethe outletisproperly
grounded.The
refrigerator shouldalways be plugged into itsownindividualelectricaloutlet whichhasa voltagerating
that matchestheratinglabelon the appliance. This provides the best performance and also prevents overloading
house wiring circuits which could cause a fire hazard from overheated wires. Repair orreplaceimmediatelyallpower
cordsthathavebecomefrayedor otherwisedamaged. Donot use a cord that shows cracks or abrasion damage along
its length or at either end. When moving the
refrigerator ,be careful not to damagethe power cord.
Refrigerant Disposal
If you are throwing away your old refrigerator it may have a cooling system that uses “Ozone Depleting” chemicals. Make
sure the refrigerant is removed for proper disposal by a qualified service technician.

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DIMENSIONS
The overall height of the unit may be reduced by over 2” with an optional shorter caster set of 4 heavy duty casters (2 come with brakes).
TECHNICAL INFORMATION
Model MXSR-23FD MXSR-23GD MXSR-49FD MXSR-49GD
In: Overall Dimension W*D*H 27 x 33.3 x 83.5 27 x 33.3 x 83.5 54.1 x 33.3 x 83.5 54.1 x 33.3 x 83.5
mm: Overall Dimension W*D*H 686 x 846 x 2121 686 x 846 x 2121 1374 x 846 x 2121 1374 x 846 x 2121
Nominal Capacity 19.3 Cu Ft / 547 L 19.3 Cu Ft / 547 L 42.9 Cu Ft / 1215 L 42.9 Cu Ft / 1215 L
Unit Weight 280 lbs / 127 kg 280 lbs / 127 kg 470 lbs / 213 kg 470 lbs / 213 kg
Hinged Doors 1 1 2 2
Shelves 3 3 6 6
Electrical Service 110V/60Hz/1Ph 110V/60Hz/1Ph 110V/60Hz/1Ph 110V/60Hz/1Ph
Wattage 320 W 320 W 520 W 520 W
Average Amp Draw 1 1.2 1.3 1.6
Refrigerant R-134A R-134A R-134A R-134A
Provided 6’ NEMA Cord Set 5-15 5-15 5-15 5-15
Factory Temperature Setting 39°F (4°C) 39°F (4°C) 39°F (4°C) 39°F (4°C)
MXSR-49FD/GD
MXSR-23FD/GD
27 in
686 mm
33.3 in
846 mm
27 in
686 mm
60.5 in
1537 mm
Max Door Swing
Clearance
60.5 in
1537 mm
Max Door Swing
Clearance
27 in
686 mm
33.3 in
846 mm
54.1 in
1374 mm
27 in
686 mm 33.3 in 846 mm 33.3 in 845.8 mm
54.1 in
1374 mm
83.5 in
2121 mm 83.5 in 2121 mm
78.5 in
1994 mm 78.5 in 1994 mm
5 in
127 mm 5 in 127 mm

Page 8of 67
RECEIVING AND INSPECTING THE EQUIPMENT
Even though most equipment is shipped crated, care should be taken during unloading so the equipment is not damaged
while being moved into the building.
1. Visually inspect the exterior of the package and skid or container. Any damage should be noted and reported to the
delivering carrier immediately.
2. If damaged, open and inspect the contents with the carrier.
3. In the event that the exterior is not damaged, yet upon opening, there is concealed damage to the equipment, notify the
carrier. Notification should be made verbally as well as in written form.
4. Request an inspection by the shipping company of the damaged equipment. This should be done within 10 days from
receipt of the equipment.
5. Be certain to check the compressor compartment housing and visually inspect the refrigeration package. Be sure lines are
secure and base is still intact.
6. Freight carriers can supply the necessary damage forms upon request.
7. Retain all crating material until an inspection has been made or waived.
INTRODUCTION
This user’s manual is intended for installing, using and servicing your Maxx Cold Select Series Reach-In Refrigerator.
It is recommended that this manual be kept in an accessible place. Every Maxx Cold machine is designed and
manufactured according to the highest standards of safety and performance. It meets or exceeds the safety standard
of UL 471 and sanitation standard NSF 7.
The LegacyCompanies assumes no liability or responsibilityof anykindfor productsmanufactured by Maxx Cold, that
have been altered in anyway, including the use of anyparts and/orother components not specifically approved by The
Legacy Companies. Maxx Cold reserves the right to make design changes and/or improvements at any time.
Specifications and designs are subject to change without notice.

Page 9of 67
COMPONENT INFORMATION
MXSR-49FD
MXSR-23FD
POWER SWITCH
THERMOSTAT
CONTROL PANEL
POWER SWITCH
THERMOSTAT
CONTROL PANEL
REFRIGERATOR
SOLID DOOR
(RIGHT)
REFRIGERATOR
SOLID DOOR
(LEFT)
REFRIGERATOR
SOLID DOOR
CASTERS
MXSR-23GD MXSR-49GD
REFRIGERATOR
GLASS DOOR
(LEFT)
LIGHT SWITCH LIGHT SWITCH
POWER SWITCH POWER SWITCH
THERMOSTAT
CONTROL PANEL
THERMOSTAT
CONTROL PANEL
REFRIGERATOR
GLASS DOOR
(RIGHT)
REFRIGERATOR
GLASS DOOR
CASTERS

Page 10 of 67
REFRIGERATOR INSTALLATION
Remove Packaging Materials
IMPORTANT:
Do not remove any permanent instruction labels or the data label on your refrigerator.
•Remove tape and glue from your refrigerator before using.
•To remove any remaining tape or glue, rub the area briskly with your thumb. Tape or glue residue can also be
easily removed by rubbing a small amount of liquid dish soap over the adhesive with your fingers. Wipe with
warm water and dry with a soft cloth.
•Do not use sharp instruments, rubbing alcohol, flammable fluids, or abrasive cleaners to remove tape or glue.
These products can damage the surface of your refrigerator.
NOTICE:
LOSS OR SPOILAGE OF PRODUCTS IN YOUR REFRIGERATOR IS NOT COVERED BY WARRANTY. IN ADDITION
TO FOLLOWING RECOMMENDED INSTALLATION PROCEDURES. PLEASE RUN THE REFRIGERATOR 24 HOURS
PRIOR TO USAGE.
Location Requirements
•Refrigerators represented in this manual are intended for indoor use only.
•Be sure the location chosen has a floor strong enough to support the total weight of the cabinet and contents as a
fully loaded unit can weigh as much as 1500 pounds.
•Reinforce the floor as necessary to provide for maximum loading.
•For the most efficient refrigeration, be sure to provide good air circulation inside and out.
Inside cabinet:
Do not pack the units so full that air cannot circulate. The refrigerated air is discharged at the top rear of the unit. It is
important to allow for proper air flow from the top rear to the bottom of the unit. Obstructions to this air flow can cause
evaporator coil freeze ups and loss of temperature or overflow of water from the evaporator drain pan. The shelves have
a rear turn up on them to prevent this. However, bags and other items can still be located to the far rear of the cabinet. Air
is brought into the evaporator coil with fans mounted to the front of the coil.
Outside cabinet:
Be sure that the unit has access to ample air. Avoid hot corners and locations near stoves and ovens.
It is recommended that the unit be installed no closer than 2" (51mm) from any wall, a max door swing clearance of 60.5
in. (1537mm) and with at least a 12" (305mm) of clear space above the unit.
WARNING
Excessive Weight Hazard
Use two or more persons to move and install refrigerators.
Failure to do so may result in back or other injury.

Page 11 of 67
REFRIGERATOR INSTALLATION (cont.)
Installation Clearance
Leveling
Ensure the floor where the unit is to be located is level.
Stabilizing
All models are supplied with casters for your convenience. It is very important, however, that the cabinet be installed in a
stable condition with the front wheels locked while in use. Should it become necessary to lay the unit on its side or back for
any reason, allow at least 24 hours before start-up to allow compressor oil to flow back into place. Failure to meet this
requirement can cause compressor failure and unit damage.
NOTICE:
Unit repairs will not be subject to standard unit warranties if due to improper installation procedures.
Electrical Connection
Refer to the amperage data on the Technical Information table, the serial tag, your local code or the National Electrical Code
to be sure that unit is connected to the proper power source.
DANGER
The unit must be turned OFF and disconnected from the power source whenever performing
service, maintenance functions or cleaning the refrigerated area. Failure to comply may
result in Death or Severe Personnel Injury.
12” (305mm) clear space
2”
51mm
MXSR-23FD/GD MXSR-49FD/GD
27 in
686 mm 27 in
686 mm
60.5 in
1537 mm
Max Door Swing
Clearance
60.5 in
1537 mm
Max Door Swing
Clearance

Page 12 of 67
OPERATION (Units Made Prior to July 2018)
Refrigerated cycle
Refrigerators: During the refrigeration cycle, the evaporator fans will run continuously even when one or more doors are
open. The door switch will activate the lights when opened on solid door models only. Glass door models lights are turned
on manually using a switch located next to the main power switch.
1. Every 6 hours, the unit will turn off and to allow the evaporator coil to air defrost. The controller now displays defrost
symbol. When the coil temperature reaches 53°F (12°C) or after 30 minutes of defrost, the unit will turn on again.
2.
Anti-condensation heaters on door frames work in conjunction with the compressor.
3.
Recommended holding temperature range: 34° to 40°F (2° to 5°C).
4.
Comes factory set to 39°F (4°C).
Power Switch:
The power switch is located on the front of the bottom panel. When the unit is on, the switch will glow green.
SOLID-STATE THERMOSTAT DESCRIPTIONS (Units Made Prior to July 2018)
1. FRONT PANEL COMMANDS
Press and release
Press and release
• Scroll through menu items
• Scroll through menu items
• Increases values
• Decreases values
Press for at least 5 seconds
Press for at least 5 seconds
• Activates the Manual Defrost function
• Configurable function by user
Press and release
Press and release
• Returns to the previous menu level
• Displays alarms (if active)
• Confirms parameter value
• Opens Machine Status menu
Press for at least 5 seconds
• Confirm commands
• Activates the Standby function (OFF)
Press for at least 5 seconds
(when outside the menus)
• Opens Programming menu
1.1 Function of LEDS
SET
AUX
ºF
ºC
set
On
Flashing
Flashing
Flashing
On
On
On
Compressor enabled
a delay, a protection or a locked start-up
Defrost in progress
manual or Digital Input (D.I.) activation
Fans output enabled
alarm active
alarm acknowledged

Page 13 of 67
OPERATION (Units Made Prior to July 2018) (cont.)
2. MAIN FUNCTIONS
2.1 HOW TO SEE THE SET POINT
1. Push and immediately release the SET key: the 'SET' label appears;
2. To display the Set point value press the SET key;
3. Wait about 15 seconds to return to normal visualization.
2.2 HOW TO CHANGE THE SETPOINT
1. Push and immediately release the SET key: the 'SET' label appears;
2. To display the Set point value press the SET key;
3. To change the Set value push the or arrows.
4. Press SET key to confirm the modification.
2.3 HOW TO START A MANUAL DEFFROST
Push the key for more than 5 seconds and a manual defrost will start. If the defrost conditions:
• parameter OdO ≠ 0
• probe Pb2 temperature is higher than the defrost end temperature
are not satisfied, the display will flash 3 times, to indicate that the operation will not be carried out.
2.4 TO LOCK THE KEYBOARD
It is possible to disable the keypad on this device. The keypad can be locked by programming the ‘LOC’ parameter.
With the keypad locked you can still access the ‘Machine Status’ menu by pressing SET key to display the Set point,
but you cannot edit them.
2.5 TO UNLOCK THE KEYBOARD
To disable the keypad lock repeat the locking procedure.
3. ALARM SIGNALLING
Alarms are always indicated
by the buzzer (if present)
and the alarm icon .
To switch off the buzzer,
press and release any key;
the corresponding icon will
continue to flash.
Label
Cause
Effects
E1
•measured values are outside
operating range
•Probe faulty/short-circuited/open
•Display label E1
•Alarm icon permanently on
•Disable max/min alarm controller
•Compressor operation based on parameters Ont and
OFt
E2
•measured values are outside
operating range
•Probe faulty/short-circuited/open
•Display label E2
•Alarm icon permanently on
•The Defrost cycle will end due to Timeout (dEt)
•The evaporator fans will work in Duty Cycle mode
AH1
value read by Pb1>HAL after time of
tAO. (see ‘MAX/MIN TEMPERATURE
ALARMs’)
•Recording of label AH1 in folder AL
•No effect on regulation
AL1
value read by Pb1<LAL after time of
tAO. (see ‘MAX/MIN TEMPERATURE
ALARMs’)
•Recording of label AL1 in folder AL
•No effect on regulation
EA digital input activation
(H11 = ±5)
•Recording of label EA in folder AL
•Alarm icon permanently on
•Regulation locked if EAL = y
OPd
digital input activation
(H11 = ±4)
(for longer than tdO)
•Recording of label Opd in folder AL
•Alarm icon permanently on
•Controller locked
Ad2
end of defrost cycle due to timeout
rather than due to defrost end
temperature being recorded by probe
Pb2.
•Recording of label Ad2 in folder AL
•Alarm icon permanently on
SET

Page 14 of 67
OPERATION (Units Made After July 2018)
Refrigerated cycle
Refrigerators: During the refrigeration cycle, the evaporator fans will run continuously even when one or more doors are
open. The door switch will activate the lights when opened on solid door models only. Glass door models lights are turned
on manually using a switch located next to the main power switch.
1. Every 6 hours, the unit will turn off and to allow the evaporator coil to air defrost. The controller now displays defrost
symbol. When the coil temperature reaches 53°F (12°C) or after 30 minutes of defrost, the unit will turn on again.
2.
Anti-condensation heaters on door frames work in conjunction with the compressor.
3.
Recommended holding temperature range: 34° to 40°F (2° to 5°C).
4.
Comes factory set to 39°F (4°C).
Power Switch:
The power switch is located on the front of the bottom panel. When the unit is on, the switch will glow green.
SOLID-STATE THERMOSTAT DESCRIPTIONS (Units Made After July 2018)
1. FRONT PANEL COMMANDS.
To display target set point; in programming mode it selects a parameter or confirm an operation.
To start a manual defrost.
In programming mode it browses the parameter codes or increases the displayed value.
In programming mode it browses the parameter codes or decreases the displayed value.
KEYS COMBINATION
To lock or unlock the keyboard.
To enter in programming mode.
To return to room temperature display.
1.1 Function of LEDS

Page 15 of 67
OPERATION (Units Made After July 2018) (cont.)
2. MAIN FUNCTIONS
2.1 HOW TO SEE THE SET POINT
1. Push and immediately release the SET key, the set point will be showed;
2. Push and immediately release the SET key or wait about 5s to return to normal
visualization.
2.2 HOW TO CHANGE THE SETPOINT
1. Push the SET key for more than 2 seconds to change the Set point value;
2. The value of the set point will be displayed and the “°C” or “°F” LED starts blinking;
3. To change the Set value push the or arrows.
4. To memorize the new set point value push the SET key again or wait 10s.
2.3 HOW TO START A MANUAL DEFFROST
Push the DEF key for more than 2 seconds and a manual defrost will start
2.4 TO LOCK THE KEYBOARD
1. Keep pressed for more than 3s the and keys.
2. The “OF” message will be displayed and the keyboard will be locked. If a key is pressed more
than 3s the “OF” message will be displayed.
2.5 TO UNLOCK THE KEYBOARD
Keep pressed together for more than 3s the and keys till the “on”
message will be displayed.
3. ALARM SIGNALLING
3.1. ALARM RECOVERY
Probe alarms P1” and “P2” start some seconds after the fault in the related probe; they automatically
stop some seconds after the probe restarts normal operation. Check connections before replacing the
probe. Temperature alarms “HA” and “LA” automatically stop as soon as the temperature returns to normal values.
Alarms “EA” and “CA” (with iF=bL) recover as soon as the digital input is disabled.

Page 16 of 67
CLEANING AND MAINTENANCE
DANGER
The unit must be turned off and disconnected from the power source whenever performing
service, maintenance functions or cleaning the refrigerated area. Failure to comply may
result in death or severe personnel injury.
Exterior and Interior Cleaning of Refrigerators
Clean using soap and warm water. If this isn't sufficient, try ammonia and water or a nonabrasive liquid cleaner. When cleaning
the exterior, always rub with the "grain" of the stainless steel to avoid marring the finish.
•Do not use an abrasive cleaner because it will scratch the stainless steel and plastic and can damage the breaker strips
and gaskets.
Cleaning the Condenser Coil
Regular cleaning is recommended every 90 days. In some instances, you may find that there is a large amount of debris and
dust or grease accumulated prior to the 90 day time frame. In these cases the condenser coil should be cleaned every 30
days.
If the buildup on the coil consists of only light dust and debris, the condenser coil can be cleaned with a simple brush. Heavier
dust build-up may require a vacuum or even compressed air to blow through the condenser coil.
If heavy grease is present, there are de-greasing agents available for refrigeration use and specifically for the condenser coils.
The condenser coil may require cleaning with the de-greasing agent and then blown through with compressed air.
Failure to maintain a clean condenser coil can initially cause high temperatures and excessive run times. Continuous
operation with dirty or clogged condenser coils can result in compressor failures. Neglecting the condenser coil cleaning
procedures will void any warranties associated with the compressor or cost to replace the compressor.
•For efficient operation, keep the condenser surface free of dust, dirt, and lint.
•We recommend cleaning the condenser coil at least once per month.
•Clean the condenser with a commercial condenser coil cleaner and a soft brush, available from any commercial
refrigeration equipment retailer, or vacuuming the condenser with a shop vac or use CO2.
CAUTION
Never use a high pressure water wash for this cleaning procedure as water can damage
the electrical components located near or at the condenser coil.
In order to maintain proper refrigeration performance, the condenser fins must be cleaned of dust, dirt and grease
regularly. It is recommended that this be done at least every three months. If conditions are such that the condenser is
totally blocked in three months, the frequency of cleaning should be increased. Clean the condenser with a vacuum
cleaner or stiff brush. If extremely dirty, a commercial-grade condenser cleaner may be required.

Page 17 of 67
CLEANING AND MAINTENANCE (cont.)
Stainless Steel Care and Cleaning
To prevent rust or discoloration on stainless steel several important steps need to be taken. First, we need to understand
the properties of stainless steel. Stainless steel contains 70-80% iron which will rust. It also contains 12-30% chromium
which forms an invisible passive film over the steels surface which acts as a shield against corrosion. As long as the
protective layer is intact, the metal is still stainless. If the film is broken or contaminated, outside elements can begin to
breakdown the steel and begin to form rust or discoloration.
CAUTION
Proper cleaning of stainless steel requires soft cloths or plastic scouring pads, never use
steel pads, wire brushes or scrapers!
Cleaning solutions need to be alkaline based or non-chloride based. Any cleaner containing chlorides will damage the
protective film of the stainless steel. If cleaners containing chlorides are used, be sure to rinse and dry thoroughly.
Routine cleaning of stainless steel can be done with soap and water. Extreme stains or grease should be cleaned with a
non-abrasive cleaner and plastic scrub pad. It is always good to rub with the grain of the steel. There are also stainless
steel cleaners available which can restore and preserve the finish of the steel’s protective layer.
Early signs of stainless steel breakdown can consist of small pits and cracks. If this has begun, clean thoroughly and start
to apply stainless steel cleaners in attempt to restore the passivity of the steel.
CAUTION
Never use an acid based cleaning solution! Many food products have an acidic content
which can deteriorate the finish. Be sure to clean the stainless steel surfaces of all food
products.
Gasket Maintenance
Gaskets require regular cleaning to prevent mold and mildew build up and also to keep the elasticity of the gasket.
Gasket cleaning can be done with the use of warm soapy water. Avoid full strength cleaning products on gaskets. Do not
use sharp tools or knives to scrape or clean the gasket.
Gaskets can easily be replaced and don’t require the use of tools or authorized service technicians. The gaskets are "Dart"
style and can be pulled out of the grove in the door and replaced by pressing the new one back into place.
Doors/Hinges
If the door is beginning to sag, tighten the screws that mount the hinge brackets to the frame of the unit. If the doors are
loose or sagging, this can cause the hinge to pull out of the frame which may damage both doors and door hinges.
Drain Maintenance
Each unit has a drain located inside the unit which removes the condensation from the evaporator coil and evaporates it into
an external condensate evaporator pan. The drain can become loose or disconnected. If you notice excessive water
accumulation on the inside of the unit, be sure the drain tube is connected from the evaporator housing to the condensate
evaporator drain pan.
If water starts to collect underneath the unit, check the condensate evaporator drain tube to be sure it is still located inside
the drain pan.
If your floor is not level, this can also cause drain problems. Be sure all drain lines are free of obstructions because this may
cause water to back up and overflow the drain pans.

Page 18 of 67
TROUBLESHOOTING GUIDE
BEFORE CALLING FOR SERVICE
If the unit appears to be malfunctioning, read through the OPERATION section of this manual first. If the problem
persists, see Troubleshooting below. The problem may be somethingverysimplethatcan besolvedwithouta service
call.
TROUBLESHOOTING
Fault Probable Cause Action
Compressor is Not Running
Fuse blown or circuit breaker tripped
Replace fuse or reset circuit
breaker. If replacement of fuse or
reset of circuit breaker doesn’t
correct the problem contact a
qualified service technician.
Power cord unplugged Plug in power cord
Thermostat set too high Set thermostat to lower
temperature
Cabinet Temperature is too
Warm
Thermostat is set too high Set thermostat to lower
temperature.
Airflow is blocked
Re-arrange products to allow for
proper air flow. Make sure there is
at least four inches of clearance
from the fan
Low refrigerant levels Contact a qualified service technician to check refrigerant
levels
Door is slightly ajar Make sure door is completely
closed.
Interior Light is Not Working
Poor switch connection Turn off light switch and turn it
back on.
Bulb is not connected Make sure the bulb is correctly
inserted in the socket.
Bulb has burned out
Replace the bulb. If replacement of
bulb doesn’t correct the problem
contact a qualified service
technician.
Condensation is Collecting on
the Cabinet and/or Floor Gasket is not sealing properly Clean, repair, or replace the gasket as necessary

Page 19 of 67
WIRING DIAGRAMS
MODEL: MXSR-23FD
SWITCH
POWER
PLUG
N
L DOOR
SWITCH
CIRCULATION
FANMOTOR
LAMP
THERMOSTATDISPLAY
ROOM EVAP
CONDENSER
FANMOTOR OVERLOAD
PROTECTOR
COMPRESSOR
tºC
PTCSTARTER
PLUG
CONDENSERFAN
COMPRESSOR
EARTH
EARTH EARTH
B B
R
BU BU
BU
BR
R
*RED-R BLACK-B BLUE-BU BROWN-BR WHITE-W YELLOW-Y GRAY-GR YELLOW/GREEN-Y/G
EARTH
LAMP
W W
Y/G
Y/G Y/G
R
BU BU
DOOR
SWITCH
R
EVAPORATOR FAN
ROOM EVAP
THERMOSTATDISPLAY
Y/G
BU
MAIN
SWITCH
DCPOWERSUPPLY
BU
BU
BU
BU
B
W
B
W
W
R
B
BR
BR BR
BR
BR
BU
BU

Page 20 of 67
WIRING DIAGRAMS (cont.)
MODEL: MXSR-23GD
SWITCH
N
POWER
PLUG
L
DOOR
SWITCH
CIRCULATION
FANMOTOR
LAMP
THERMOSTATDISPLAY
CONDENSER
FANMOTOR OVERLOAD
PROTECTOR
COMPRESSOR
ROOM EVAP
PIPEHEATER
PTCSTARTER
LAMP
SWITCH
t ºC
PLUG
CONDENSERFAN
COMPRESSOR
EARTH EARTH
B B
R
BU
R
BU
*RED-R BLACK-B BLUE-BU BROWN-BR WHITE-W YELLOW-Y GRAY-GR YELLOW/GREEN-Y/G
EARTH
W W
Y/G
Y/G
R
BU
BU
EVAPORATOR FAN
DOOR
SWITCH
ROOM EVAP
THERMOSTATDISPLAY
Y/G
BU
MAIN
SWITCH
DC POWER SUPPLY
BU
BU
BU
B
B
BR
BR
R
BR
BU
W
BR BR
B
R
Y/G
EARTH
BU
R
LAMP BU
R
B
BU
BU
BU
BR LAMP
SWITCH
BR
BR
B