Samsung Refrigeration Familiarization

Maytag Technical Training Services 2003

ABSL2004-001 R3.0

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Samsung Refrigerator Service Familiarization

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Samsung Side by Side

Based on model RS2577

5/16 line

Door Removal

Unit uses John Guest fittings for water connection to dispenser. Make sure that the hose is cut square with no nicks for prevention of leaks at the water connection. The water line fitting incorporates a one-way valve.

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1/4 line One way valve incorporated into fitting

Under the freezer hinge cover are the electrical connections for the front display panel. All electronics and control circuits are in the rear control compartment. The display panel is just data input and display. There is also thermistor to monitor the exterior temperature under this hinge cover. The thermistor is on a very short harness.

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Room Ambient Temperature Sensor

Connections through the upper freezer door hinge.

Data Circuit Harness

Load Circuit Harness

Dual Evaporators

Side wall pipes are steel. Hot pipes are copper.

There are two evaporators in the system. The high side feeds into the fresh food compartment evaporator through a cap tube. The outlet of the fresh food evaporator supplies the freezer evaporator. The sealed system uses a combination of a sub condenser in the machine compartment and a hotwall condenser. Because of the hotwall condenser, this type of system cannot be completely enclosed. There are clearance requirements on all sides of the cabinet. The pc (yoder) loop is made of copper while the hot wall pipes are steel. There are multiple evaporator fan outlets distributed throughout each cavity.

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Freezer Evaporator

CoolSelect Zone Air Damper

Refrigerator Evaporator Side Views

Freezer Temperature Control: To set freezer temperature, press the the Freezer Temp button. The display shows the set temperature from 14F to +8F in sequence

The temperature settings will display the current set-point the first time that the Fridge Temp or Freeze Temp buttons are pressed. Each subsequent pressing of the controls will decrease the set-point until the minimum is reached. Pressing the control again will cycle the control to the maximum setting.

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Refrigerator Temperature Control: To set refrigerator temperature, press the the Fridge Temp button. The display shows the set temperature from 34F to 46F in sequence

The temperature settings will display the current set-point the first time that the Fridge Temp or Freeze Temp buttons are pressed. Each subsequent pressing of the controls will decrease the set-point until the minimum is reached. Pressing the control again will cycle the control to the maximum setting.

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Child Lock Function: Press the child lock button for 3 seconds, the child lock indicator comes on with an audible tone. To unlock this function, press and hold the child lock button for 3 seconds.

Press the child lock button for 3 seconds, the child lock indicator comes on with an audible tone. No function commands except the ice type button will be accepted. This function will prevent accidental settings. To unlock this function, press and hold the child lock button for 3 seconds.

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Ice Type: The ice type button selects Cubed/Crushed/Ice-off options in sequence. If ice off is selected, the ice maker will stop working.

The ice type button selects Cubed/Crushed/Ice-off options in sequence. The default setting is Cubed Option. If ice off is selected, the ice maker will stop working, this option will be terminated when Cubed or Crushed options are selected.

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Power Freeze: When the power freeze button is depressed, the power freeze indicator light comes on immediately. The compressor and fan run continuously for a set time and temperature depending on model.

Power Freeze: When the power freeze button is depressed, the power freeze indicator light comes on immediately. The compressor and fan run continuously for a set time and temperature depending on model. Refer to the service flash. Pre June 2003 production Power Freeze operation differs from post June 2003 operation.

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Power Cool: When the power cool button is depressed, the power cool indicator light comes on immediately. The compressor and fan run continuously until the refrigerator reaches 25F.
Power Cool: When the power cool button is depressed, the power cool indicator light comes on immediately. The compressor and fan run continuously until the refrigerator reaches 25F

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Filter indicator light is normally green. After 5 months of service it changes to orange, at the 6th month it changes to red. To reset: Press the Ice Type and Child Lock buttons for 3 seconds

Filter indicator light: This indicator light is normally green, after 5 months of service it changes to orange, at the 6th month it changes to red. To reset: depress the Ice Type and Child Lock buttons for 3 seconds. This is strictly a time-based function, this does not monitor water usage.

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Self-Diagnostic Function

When power is first applied, the system performs a power-up self check. Any failure of an active component will result in a specific segment of the display illuminating. There are two versions of the selfdiagnostic output. On units produced before June 2003 will not display for Refrigerator Defrost errors (7) or Freezer Defrost Errors (13). The self diagnostics can be activated by pressing the Power Cool and Power Freeze buttons at the same time for eight seconds.

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Load Operation Check Function

All currently powered (active) components can be displayed by holding down both the Power Freeze and Power Cool buttons for six seconds followed immediately by the Fridge Temp button. The display will indicate everything that is currently energized. There is a twenty second time-out on this function.

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Set Point Shift Function

Offsets are included that will allow for adjusting to the characteristics of the thermistors. Hold the Freezer Temp and Power Cool buttons for twelve seconds. It is highly recommended that these adjustments are avoided.

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The Fridge Temp display shows which mode the adjustment is being made to. There are four different thermistors that can be adjusted. Freezer offset is mode 0. Fresh Food offset is mode 1. Ice Maker thermistor offset is mode 4. CoolSelect zone is mode 20. Icemaker fill time can be adjusted when in mode 3. It is strongly suggested that the icemaker fill time should not be adjusted. The Freezer Temp display indicates the amount of the offset based upon memory tables. It is imperative that the reference tables be used when making an offset adjustment. The values displayed in the Freezer Temp display are not the actual offset temperatures. In this example, the freezer thermistor is being offset by 6 degrees.

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Freezer Temp Sensor Shift

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In this example, the fresh food thermistor is being offset by +3.0 degrees.

Refrigerator Temp Sensor Shift

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Water Supply Time Shift

It is strongly recommended that the icemaker fill time should not be adjusted.

Icemaker Temp Sensor Shift

Two different sets of icemaker thermistor offset adjustments have been used. One set is for pre-June 2003 production.

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Pre June, 2003

Post June, 2003

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CoolSelect Temp Sensor Shift

Thermistor Spec Chart

Thermistors are all the same sensor with different harnesses attached depending on the mounting. It is possible to either check the resistance of the sensor with the connection unplugged, or check the DC voltage of the sensor.

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Defrost Function

Since there are two evaporators in the system, there are two evaporator defrost heaters. Defrost is adaptive and will terminate based upon the evaporator thermistor temperature readings. The system is designed to defrost the fresh food section twice as often as the freezer section. This compensates for the fact that the fresh food section is accessed more frequently than the freezer section. The fresh food section can defrost independently of the freezer section, but the freezer section will always defrost at the same time as the fresh food section. The fresh food section will defrost once for every six to eight hours of compressor run time while the freezer section will defrost every twelve to sixteen hours of compressor run time. When started from room temperature, the first defrost cycle will begin after four hours of compressor run time. The defrost temperature is monitored at the bottom right of the freezer evaporator and at the top left outlet of the refrigerator evaporator.

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Forced Operation Function

1) Compressor Check 2) Refrigerator Defrost Heater Check 3) Ref and Fr Defrost Heater Check 4) Cancellation of Function
Used to Test Sealed System Components Note: Unit will beep continuously as long as the unit remains in forced operation function

The forced operation check allows a forced check of the cooling system. Each mode will operate until the next mode is selected or until the test is cancelled. The forced mode cannot be activated if the unit is defrosting either of the evaporator coils. The compressor will run for 24 hours and then begin cycling at -25 degrees centigrade in the freezer and 1 degree centigrade in the fresh food compartment. Loss of power will also cancel this function. There is no delay in compressor start so if there is high head pressure, an overload condition can be encountered. The three individual tests are; Forced compressor pull-down, Refrigerator defrost check and refrigerator and freezer defrost check. To enter the forced operation mode, depress the Power Freeze and the Fridge Temp buttons for eight seconds.

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Forced Operation Functions

Press any button except ICE TYPE or CHILD LOCK to enter the Pull-Down Mode. (Compressor Check) Wait approx. 5 seconds before pressing another button to enter the Refrigerator-Defrost Mode. (Ref Heater Check) Wait approx. 5 seconds before pressing another button to enter the Ref-Freezer-Defrost Mode. (Ref & Freezer Heater Check) Cancellation: Wait approx. 5 seconds before pressing another button to Cancel or unplug the unit.

Pressing the Ice Type or Child Lock buttons will cancel this mode of operation. During each test the timing of the beeps will vary.

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Condenser Fan Delay

The condenser fan operation will change depending on the ambient temperature. Above 65 degrees Fahrenheit, the condenser fan will begin operation with the compressor. Between 61 and 65 degrees, the condenser fan energizes five minutes after the compressor energizes. Below 60 degrees, the condenser fan will not operate. This function is used to promote good oil distribution within the compressor.

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Model number and specifications are located on rear of cabinet.

Model Specifications can be found on the tag located on the back of the product above the access panel

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Machine Compartment Service Video

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Noise Filters Blue line from filter

There are electrical noise filters connected in parallel with the water valves.

Grey line to ice maker White line to water dispenser

The compressor run capacitor and an AC line filter are located in the control panel housing. The red input wire is L1 and the black wire is neutral.
120VAC Line filter

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Compressor run capacitor

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+5VDC +12VDC

There are high voltages present on the larger heat sink mounted to the board.

Caution: There are high voltages present on the printed circuit board

Refrigerator drain tube Vent holes

Freezer drain tube

Each evaporator has its own drain hose. Make sure that these hoses are installed with the slots near the bottom.

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Drain slots

Harmonic Balancer

Compressor component routing. The rubber grommet on the discharge tube is for noise reduction. The compressor relay cover pries out and down from the compressor housing. The compressor uses a PTC starting device. The compressor harness and PTC can be removed either separately or as an assembly.

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Water System and Dispenser Service

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Water Circuit

Water system routing. The water filter is under supply pressure. There is a built-in shut off valve to stop flow if the filter is removed. All filter heads in units manufactured before June 2003 should be replaced.

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Dispenser System Service Video

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SXS Freezer Components

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Freezer Compartment Service Video

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There is a drain trough heater to prevent drain freeze-ups.

Freezer evaporator drain trough heater

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A fill tube heater is used to prevent icemaker fill tube freeze-ups.

A low wattage heater is attached to the icemaker inlet tube to reduce the chance of freeze up

Heater is secured to the tube and surrounded with insulating foam secured with a plastic wire tie

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Refrigerator Components

Three drawers. The upper drawer provides for independent temperature control. This is called the CoolSelect zone. One of the independent modes of operation is a thaw function that uses the refrigerator defrost heater to provide increased temperature for a set period of time, after the set time period elapses, the CoolSelect zone returns to normal operation. The CoolSelect zone can also provide for reduced temperature. When used in the thaw mode, the display will show the remaining time set in the mode. The Quick Cool mode provides for 100% cooling for up to 60 minutes. The display will show the remaining time in that mode. The temperature selector provides for independent temperature control including a soft freeze at 23 degrees.

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Slide 48

Fresh Food Section Service Video

Filters remove in the unlock position and are secured in the locked position. The filter head has a built in by-pass system to prevent water leakage when removed. The filter is under positive pressure. It is connected directly to the incoming water supply.
Refer to the lock symbols and alignment arrow when servicing the filter turn clockwise to tighten counterclockwise to remove

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The water filter housing used on 2002 production models has been revised for 2003 to eliminate cracking and leaking. Replace 2002 housings

All pre 2003 filter housings should be replaced for increased reliability.

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Freezer and Refrigerator Door Switches

Red and White 120VAC Circuit

Carefully pry out front edge of light switch to Brown and release and White Data remove Circuit

Door switches are double pole, double throw switches. Low voltage contacts are used to inform system control when a door is open. High voltage contacts are used to route power to the interior lamps.

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Freezer Door Switch

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Handle and Trim Service Video

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Electrical Circuits

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L1

See Page 32

SXS Schematic

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Main control board layout. See Page 33

Main PCB Power Supply

+12VDC and +5VDC supplies are critical for proper operation. If the +12VDC is below +11.9VDC there is a strong possibility that compartment temperatures will be abnormal. There is no repair of the power supply, just replacement of the complete control board. Be cautious of the large heat sink in the power supply, high voltages are present.

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Thermistor Spec Chart

Thermistors are all the same sensor with different harnesses attached depending on the mounting. It is possible to either check the resistance of the sensor with the connection unplugged, or check the DC voltage of the sensor. See Page 33

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Main PCB Fan Motor Circuitry

The Freezer and condenser fan operate in two speed modes. The fresh food evaporator fan is only operated at the lower speed.

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Resistance checks of the Fans are with connector CN72 disconnected.

Evaporator and condenser fan output voltages can be checked at the metal tab of the output transistors. Reference to DC ground which is the tab of the +5VDC regulator.

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All of the 120VAC outputs are located along one edge of the control board.

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Samsung Bottom Freezer

The bottom freezer incorporates electronic control.

Based on model RB1855

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Each compartment uses multiple air outlets for even temperature control.

There are two evaporators, one in each compartment. This is a hot-walled refrigerator and requires one inch of clearance around the installation. The Sub-condenser empties into a steel hot-wall condenser that feeds a copper hot gas loop around the door openings. The hot gas loop supplies the fresh food evaporator and the refrigerant flows to the freezer evaporator before returning to the compressor.

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Self Diagnostics

To enter the self diagnostics function, press the Power Freeze and Power cool buttons for five seconds.

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Press Power Freeze and Power Cool for Five Seconds.

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The self-diagnosis will test the thermistors and display any failures found in the sensor circuits.

Operational Load Check

To enter the Operational Load Check function, press the Power Freeze and Power cool buttons for three seconds followed by the Refrigerator Temp button within two seconds.

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Press Power Freeze and Power Cool for three seconds followed by the Refrigerator Temp button within two seconds.

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During the operation load check, the illuminated digits will indicate the currently powered components as well as indicate special modes of operation. The display LED listed refers to the two digit display for either the refrigerator or freezer temperature. Each display has a tens digit as well as a ones digit. The tens digit is the left-hand seven segment display (8) and the ones digit is the right-hand seven segment (8) display.

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Fresh Food Compartment Service Video

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Freezer Compartment Service Video

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Remove 3 Screws

The electronic display is mounted to the bottom edge of the fresh food door with three screws.

Slide display down

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Gently remove door switch assembly.

Carefully release catches on each side of door switch and pry out

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The gaskets on current Bottom Freezer Models are not replaceable, the entire door must be replaced as an assembly

Door gaskets on the current bottom freezer models are not replaceable.

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There is a defrost drain tube for each compartment. The duckbill valves differ. There are standoffs in the condensate tray that the drain tubes must slide over.

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The duckbill valves are different

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Machine Compartment Service Video

L1 N

On the bottom freezer models, the red wire is hot or L1 and the gray wire is neutral. See Page 34

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Slide 78

The bottom freezer uses a more simplified control board. See Page 35

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All loads are 120VAC components.

Thermistor Spec Chart

Thermistors are all the same sensor with different harnesses attached depending on the mounting. It is possible to either check the resistance of the sensor with the connection unplugged, or check the DC voltage of the sensor. On the bottom freezer refrigerator there is no offset adjustment of the thermistors. See Page 31

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While the fresh food and freezer thermistors can be adjusted by clipping out diodes on the main board. It is suggested that this approach not be used. Either replace the thermistor that is out of range or replace the main control board depending on the fault condition.

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Forced Defrost Test Switch

There is a low voltage transformer that supplied 9VAC and 13VAC. The test switch will initiate a defrost cycle. The first time it is pressed, the fresh food section defrosts independent of the freezer section. Pressing a second time will initiate a combined fresh food and freezer defrost. Pressing the test button a third time will cancel the forced defrost.

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Thermistor Specification Chart

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Side by Side Schematic

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Side by Side Control Board

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Bottom Freezer Schematic

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Bottom Freezer Control Board

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Be Aware, Be Alert Always work safely. On the Job, On the Road, In the Home Every Time, All the Time