Blodgett 20120SB Service Manual

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Installation, Operation &

Maintenance Manual

Refrigerated Base – Self-Contained

1100 Old Honeycutt Road, Fuquay-Varina, NC 27526

919-552-9161 • 800-348-2558 • 919-552-9798 (fax) • 800-238-8444 (after hours)

Printed in USA 12/02

MODELS

20036SB 20084SB

20048SB 20096SB

20060SB 20108SB

20072SB 20120SB

Printed in USA 12/02

INTRODUCTION

GENERAL INFORMATION

This technical manual provides information for the installation, operation, maintenance, and inspection of this unit manufactured by Middleby. A complete parts breakdown is also provided.

TECHNICAL SUPPORT

For any questions regarding the installation, operation or maintenance of the unit, contact the factory at the following address:

Technical Service Department Middleby 1100 Honeycutt Road Fuquay-Varina, NC 27526

SCOPE OF THE MANUAL

This manual provides sufficient information for maintenance of the equipment.

EQUIPMENT DESCRIPTION

The unit consists of the following parts:

• Storage compartment - The insulated food storage compartment is clear storage area. The cooling coil (evaporator) is contained in this area.

• Drawers - Product is stored by means of food pans set in drawers. The drawer face is made of an insulated panel. The drawer face (panel) is fully “gasketed” to provide a tight seal against the cabinet.

• Condensing Unit Compartment - This area contains the condensing unit(s) along with the necessary controls and other components.

• Evaporator Coil - The evaporator coil is located in the storage compartment and is responsible for distributing the cold air associated with the refrigeration system.

• Cabinet - The cabinet is the enclosure in which all of the above mentioned items are housed.

EQUIPMENT SUPPLIED

The unit is shipped from the factory assembled. The complete assembly is palletized and crated to minimize the possibility of damage in shipping and storage.

Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Scheduled Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Corrective Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

Electrical and Mechanical . . . . . . . . . . . . . . . . . . . . . . . . .24

Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

NOTICE!

MIDDLEBY RESERVES THE RIGHT TO CHANGE SPECIFICATIONS AND PRODUCT DESIGN WITHOUT NOTICE. SUCH REVISIONS DO NOT ENTITLE THE BUYER TO CORRESPONDING CHANGES, IMPROVEMENTS, ADDITIONS OR REPLACEMENTS FOR PREVIOUSLY PURCHASED EQUIPMENT.

Self-Contained, Refrigerated Bases

SAFETY

Printed in USA 12/02

DANGER

EXPLOSION HAZARD If gas odor is detected, shut down equipment at the main shutoff valve. Immediately call the emergency phone number of your gas supplier.

SPECIFICATIONS

SAFETY NOTICES

DANGER This symbol warns of immediate hazards which WILL result in severe injury or death.

WARNING

FIRE HAZARD For your safety, do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.

Keep area around appliances free and clear of combustibles.

WARNING Asphyxiation can result from improper ventilation. Do not obstruct the flow of combustion and ventilation air to /and from your cooking equipment.

WARNING This symbol refers to a potential hazard or unsafe practice which COULD result in injury or death.

CAUTION This symbol refers to a potential hazard or unsafe practice which COULD result in injury, product or property damage.

NOTICE! This symbol refers to information that requires special attention or must be fully understood, even though not dangerous.

SAFETY PRECAUTIONS

NOTICE! Post the emergency telephone number of your gas supplier and instructions to follow if gas odor is detected.

NOTICE! Be sure this manual and important papers are given to the proper authority to retain for future reference.

Model W D H* Drawers No. of Ref. Elec. Compressor Evap. Amps Shipping Number Pans Volume V/Ph/Hz HP BTU Weight

12"x20"x4" (cu.ft.) (lbs.)

18" 26" 31"

20036SB 20048SB 20060SB 20072SB 20084SB 20096SB 20108SB 20120SB

36" 48" 60" 72" 84"

96" 108" 120"

4 6 4

2 4 4 8

8 10 12 12

5.9

8.6 12

15.5

19.3

22.5 24

29.2

1/4 1/4 1/4 1/3 1/3 1/2 1/2 1/2

6 6 6 7 7 7 7 7

310 410 530 650 740 840 960

1050

1100 1100 1100 1600 1600 1600 1600 1600

115/1/60 115/1/60 115/1/60 115/1/60 115/1/60 115/1/60 115/1/60 115/1/60

32" 32" 32" 32" 32" 32" 32" 32"

26" 26" 26" 26" 26" 26" 26" 26"

*Includes 6" legs or casters

Figure 1.1 - General Arrangement Picture

Table 1.1 - Leading Particulars

Printed in USA 12/02

OPERATION

INTRODUCTION

This model is a heavy-duty piece of equipment designed for continuous use. It incorporates automatic controls to regulate the cycling of the refrigeration system.

CONTROLS AND INDICATORS

Table 2.1 - Controls and Indicators

NAME TYPE FUNCTION

Low Pressure Switch Contact Points Cycles the refrigerator system (automatic)

Suction Valve Manual Plunger Valve Isolate suction at the compressor

Discharge Valve Manual Plunger Valve Isolate discharge line at receiver

Power Control Switch (On/Off) Contact Points Terminates all of the electrical into and past

the supply cord

Thermostat Contact Points Cycles the refrigerator system (automatic)

Defrost Timer

Contact Points Controls scheduled evaporator coil defrosting

Solenoid Valve Automatic Plunger Shuts off refrigerant flow

Freezers

OPERATION

Printed in USA 12/02

START-UP PROCEDURE

The refrigeration system is completely factory assembled, pre-charged and ready for operation. To energize the system it is only necessary to find the power supply cord and connect it to a proper electrical source. Once the supply cord

SHUT-DOWN PROCEDURE

To shut down, disconnect the electrical supply cord and open or remove the drawer(s) allowing the interior cabinet temperature to equalize with the room temperature. A mild detergent diluted in warm water should be used to wash down the interior and exterior surfaces of the cabinet.

Table 2.2 - Start-up Procedure (Refrigerated Storage)

Operation Results

1. Activate system by inserting electrical service cord into electrical supply source and flip power control switch.

2. Locate liquid refrigerant indication glass mounted on the receiver.

3. Wait 15 minutes.

4. Wait 3 hours.

Compressor should immediately come on line along with the condenser fan and the evaporator fan.

Once the system has been operating for two minutes, the glass should appear clear and full of liquid refrigerant.

The temperature in the storage area should begin to approach the “green zone” on the thermometer indicating adequate operation.

Once the operating temperature has been reached, stocking of the containment area can begin.

has been connected to a power source, the unit can be started by flipping the power control switch to the “ON” position.

WARNING Prior to any cleaning of the system involving placing hands in areas with moving parts, the system should be deactivated by disconnecting the power supply cord.

Table 2.3 - Shut Down Procedures

Operation Results

1. De-energize the system by flipping the power control switch to the “OFF” position and disconnecting the electrical supply cord.

Once the system is de-energized, the condenser fan and the evaporator fan will cease operation.

Printed in USA 12/02

OPERATION

PREPARATION FOR AN EXTENDED PERIOD OF INACTIVITY

This unit is designed for continued use at automatically cycled intervals. However, in the event of an extended shut down, both the mechanical refrigeration system and the food storage compartment system must be serviced.

Table 2.4 - Shut Down Procedures for an Extended Period

Operation Results

1. Fully close discharge valve at the receiver.

2. Fully close suction valve at the compressor.

3. Disconnect power supply.

4. Clean and wipe dry the food storage compartment.

Compressor will pump liquid refrigerant from system to receiver.

This will isolate the refrigerant between the two valves.

De-energizes the system.

This will reduce the odor buildup during shut down.

FUNCTIONAL DESCRIPTION

Printed in USA 12/02

SYSTEM DESCRIPTION

This unit is a self contained, automatically controlled, continuous duty, perishable food storage system. It is designed with the intent and purpose of storing food items.

The operating temperature is automatically monitored by controls that are factory set to maintain a predetermined adequate condition.

The equipment is installed in two basic compartment assemblies. They are:

• Condensing Unit Compartment - This area contains the condensing unit along with the necessary controls.

• Storage Compartment - This insulated food storage area is clear storage area.

SYSTEM OPERATION

The design of the refrigerated cabinet focuses primarily on the safe storage of food products requiring refrigeration. In engineering, considerable attention was placed on its functionality and its serviceability.

The refrigeration system is a closed loop system. Barring a leak in the system, the addition of refrigerant is not required. However, a periodic check of its level is recommended to insure that the system operates at the optimum level at which it was designed.

The condensing unit is found within the regular equipment compartment. Also in this compartment is the electrical control panel that contains the power switch and a terminal box. On all models that feature forced air evaporators, a heated condensation evaporator pan or a heated condensing unit base is provided. The evaporator pan is also located in the equipment compartment.

Special care in the initial loading of the storage compartment should be taken. It is suggested that the loading be scheduled in three equal portions allowing three hours between each loading.

The chilled food compartment is designed for the storage of perishable food items that require a temperature range of 37 to 40 degrees Fahrenheit. It is a general rule that adequate spacing is allowed between stored items to allow for proper air circulation.

SCHEDULED MAINTENANCE

INTRODUCTION

To ensure the longest and most trouble free operation of the unit, a thorough maintenance schedule is required to be adhered to periodically. The maintenance system should be designed to maximize the efficient use of maintenance personnel, reduce down time, and provide the orderly acquisition of spare parts support.

The Middleby refrigeration cabinet will generally be in operation in a facility where scheduled maintenance is performed according to Maintenance Index Plans. Your unit is no exception to required maintenance. This section of the manual is intended as an alternative to any standard maintenance program that may pre-exist. The preventive maintenance schedule is based upon similar maintenance requirements for commercial refrigeration equipment.

PREVENTIVE MAINTENANCE ACTION INDEX

If you do not have a Maintenance Index Plan, one is included for you in Table 4.1.

PREPARATION FOR MAINTENANCE

Since many areas affected by the maintenance schedule are electrically supplied, it is recommended that the system be de-energized prior to making the inspections.

MAINTENANCE

Weekly Inspection

1. The unit should first be de-energized by switching the toggle switch to the “OFF” position. The switch is found on the control panel in the condensing unit compartment.

NOTE: It is necessary to first remove the front air grill. This is done by lifting it straight up then pulling the bottom out and down.

2. Using a vacuum or small hand broom, brush the condenser in a vertical motion to remove any dust or debris that may have accumulated.

Printed in USA 12/02

SCHEDULED MAINTENANCE

Monthly Inspection

1. Check the evaporator drain line at both the inlet and outlet ends to make certain that there are no obstructions. It is not recommended to use any chemicals in clearing a clogged drain. The preferred method of unstopping an obstructed drain is to use compressed air. Approximately 60 lbs. should be sufficient. Simply remove the drain line at the evaporator coil and attach an air-line to it.

2. With the unit in a cooling cycle, use a flashlight and locate the refrigerant sight glass. If the compressor has been running for three minutes there should be no visible bubbles.

3. If bubbles are present:

a. Determine if there is a leak by using a halide or

electronic leak detector.

b. Repair leak(s).

6. To inspect the evaporator motor, first turn the unit off. Then, remove the drain line from the evaporator pan. Loosen the four screws that hold the shroud. Lower the shroud and disconnect the polarized electrical connection. With the shroud out of the cabinet, proceed to inspect the motor mounting bolts and the fan for cracks or excessive play.

7. Using a mild detergent and water, wipe the vinyl gasket. Make certain to also clean under the gasket to remove any mildew or residue.

8. Using a mild, non-abrasive detergent and warm water, wipe the cabinet exterior. When cleaning always follow the grain of the stainless steel to prevent scratching or marring of the finish surface.

Annual Maintenance

1. Slide condensing unit out of the compartment and check all refrigerant lines for leaks or fatigue. Make certain that no exposed copper tubing is in contact with any other metal surface. If there is contact, install an insulating material between the tow metal components.

2. With the condensing unit out and the breaker at the main panel “OFF”, inspect the system’s wiring. Look for a tight fit of all connections and make certain the that the wire restraining devices are tight. Inspect all wires and cords, paying particular attention to nicks or age cracks in the insulation.

3. Visually inspect the outer panel and components of the cabinet. Check screws and bolts to make certain that they are tight. Also, make sure that the bolts that secure the base frame to the deck are tight.

Three Year Frequency

1. Replace the drawer gaskets. To accomplish this, it is first necessary to remove all products from the refrigerated compartment to avoid spoilage. Open the drawers and remove the old gasket. The gaskets snap in and out of a channel on the back side of the door. Clean the track thoroughly. Replace the old gasket with the new one by snapping it into place.

2. Inspect all motors and shafts for both noise and wear. If they show age, replace them.

3. With the main power off, remove the condensing unit from its compartment and inspect all wiring. Also, remove the cover from the controls and check them to make certain that they are operational and do not show signs of wear.

4. Inspect the operation of the drawer slide assembly. Make certain that the moving parts do not show any signs of wear. Make sure that all screws are tight.

WARNING The system should be de-energized when checking for leaks.

i. If a leak is found on a flared fitting, it can often be

repaired by simply tightening the brass flare nut 1/4 of a turn. If tightening does not repair the leak, it may be necessary to reflare the tubing.

ii. If a leak is found on a brazed joint, it will be

necessary to pump down the system’s refrigerant charge to remedy the problem.

iii. To pump the refrigerant into the receiver, you must

first connect service gauges to the system at the suction valve on the compressor and the liquid valve on the receiver. Purge the gauges before opening the system’s valves to avoid contamination. Run the receiver (liquid or high pressure) valve all the way in to stop the refrigerant from exiting the receiver. Start the unit and allow it to run until the suction or low-pressure gauge reads 5 lbs. When it reaches 5 lbs., de-energize the system.

iv. Once pumped down, the necessary repairs can be

made.

4 Using a mild non-abrasive detergent and soft cloth,

wipe the interior lining beginning with the top and working down. Also, wipe the gasket and where it sits on the cabinet exterior.

5. Remove the front air grill and unbolt and condensing unit. Once unbolted, slide it out. The unit is capable of being completely removed due to the extra tubing coiled up behind the unit. With the unit de-energized, check the condenser fan motor and make certain that it is no loose. Inspect the fan for cracks and make sure that it is tight on the motor.

SCHEDULED MAINTENANCE

Printed in USA 12/02

5. To recalibrate the thermometer, remove it from the cabinet. Using a small, flat screwdriver, remove the lens. Prepare an ice water bath and immerse the thermometer bulb at least two inches into the ice bath. WIthin 30 seconds the indicator dial should read 32 degrees Fahrenheit. If it does not, it needs to be recalibrated. Do this by placing your index finger on the opposite side of the needle that needs to move. Then, using a flat screwdriver, turn the screw at the center of the dial 1/4 of a turn in the direction you want to move the dial. Repeat the procedure until the needle is on 32 degrees. See Figure 4.1.

Figure 4.1 - Thermometer Calibration

Table 4.1 - Preventative Maintenance Action Index

Weekly

Monthly

Annually

Three-year Frequency

a. Inspect condenser coil to make certain that air flow is not

hampered and that it is clear of dust and debris.

a. Inspect and clear drain line.

b. Check the liquid refrigerant sight glass to make certain that

the system is completely charged.

c. Clean the interior of the cabinet with a mild soap and warm

water solution. Be certain to dry thoroughly.

d. Check both the condenser fan motor and the evaporator

fan motor to make certain that they are operational and that the fans are tight and secure.

e. Clean door gaskets and breaker strips with a damp cloth.

f. Clean exterior of cabinet with mild soap and warm water.

Dry thoroughly.

a. Slide condensing unit from the refrigeration compartment

and check all joints and fittings for any signs of leaks or fatigue.

b. Inspect electrical connections to confirm that there is good

contact and that wires are neither weakened nor frayed.

c. Check the integrity of the cabinet.

a. Replace door gaskets.

b. Inspect motor shafts for noise or wear.

c. Inspect electrical controls and wiring.

d. Inspect drawer slides.

e. Recalibrate thermometer.

Lower Temperature

Higher Temperature

Printed in USA 12/02

TROUBLESHOOTING

INTRODUCTION

This chapter provides a systematic check of components in determining a possible cause of failure in the event of various symptoms.

It is necessary that the individual performing the troubleshooting tasks be familiar with the function of the equipment as described in the Functional Description section.

The following tables list the most common symptoms that may be experienced and the recommended corrective action.

Table 5.1 - Mechanical and Electrical Troubleshooting Guide

SYMPTOM POSSIBLE FAILURE REMEDY

Unit does not operate

Unit runs continuously

Low head pressure

High head pressure

Short cycling

Unit does not cool

1. Control failure

2. Incorrect voltage

3. Failed compressor

1. Low on refrigerant

2. Control failure

3. Bad connection at TXV

4. Restricted air flow or dirty

5. Bad condenser fan motor

6. TXV stuck open

7. Compressor failure

8. Ineffective door seal

9. Restricted circulation in storage compartment

1. Defective compressor

2. Low refrigerant

3. Ambient temperature too low

1. Blocked or dirty condenser

2. Ambient temperature too high

3. System contains air

4. Refrigerant overcharge

1. Maladjusted control

1. Blown fuse/circuit breaker

2. Bad connection at supply cord

3. Ill fitting gasket

1. Adjust or replace control

2. Correct

3. Replace

1. Leak check system and recharge

2. Adjust or replace control

3. Check and secure sensor bulb to suction line

4. Rectify air flow problem and clean condenser

5. Check and replace if necessary

6. Replace

7. Replace

8. Adjust door strike and hinges

9. Redistribute food for even air flow

1. Replace

2. Leak check system and recharge

3. Raise room temperature

1. Clean and remove any obstructions

2. Lower room temperatures

3. Evacuate, change filter dryer, recharge

4. Reduce amount of refrigeration in system

1. Adjust control

1. Replace fuse/reset circuit breaker

2. Check supply cord at outlet

3. Tighten strike on door latch

CORRECTIVE MAINTENANCE

Printed in USA 12/02

INTRODUCTION

This chapter focuses on the instruction needed in the removal and replacement of certain components. It also addresses the repair of components not listed under the scheduled maintenance index covered in the Scheduled Maintenance section.

The level of skills required to perform the service or repair will vary. Some may require specific training while others may be performed by any type of mechanic. It is up to the individual and his/her supervisor to determine the breadth of knowledge required to perform the necessary service or to make the necessary repairs.

It is also important to know that any procedure requiring the handling of refrigerant requires proper certification.

The service or repair items are limited to those parts listed in Table 7-3.

REPAIR PROCEDURES

7. Using wrenches, remove the suction and discharge valve stem cover caps on each side of the compressor. Also, remove the cap nut on the suction and discharge side as well.

8. Disconnect the high-side line at the compressor. This is done by heating the brazed connection using an acetylene and oxygen torch set.

NOTE: Do not apply a flame to a line containing refrigerant.

9. To remove the low-pressure control capillary tube and service fitting, loosen the 1/4" brass flare nut on the suction valve.

10. The final step in removing the compressor is to disconnect it from its mounting. To free the compressor, remove the wire clips on each of the four feet.

11. To install the compressor, place it in position on the base and reinstall the four wire clips.

12. Reattach the suction and discharge valve blocks to the appropriate sides of the compressor.

13. Reattach the low-pressure control capillary tube and service fittings to the suction side of the compressor.

14. Reattach the suction line to the compressor.

15. In reconnecting the high-pressure line, it is necessary to first prepare the line’s end. Using a fine sandpaper or emery cloth, clean the residue off of the end. Also, clean the connection on the compressor. Apply flux to both ends and braze the connections into place.

16. Remove the valve stem cap from the suction valve block on the side of the compressor. Run the valve stem all of the way out and then in one turn clockwise.

17. Place the refrigeration service manifold gauge hoses on the suction and high-side valves. Attach a bottle of refrigerant to the charging hose and charge the system with 150 psi of vapor. Using an electronic leak detector, check the new connections for leaks. Should a leak appear, evacuate the charge and repair the leak. Repeat the leak check process again.

18. If the system checks out with no leaks, recover the test charge using a vacuum recovery pump.

19. With the system pressure at zero, connect the vacuum pump and evacuate the system. The pump should run for one hour. The vacuum pump should pull the system down to 30 inches of vacuum.

20. Reattach the electrical terminal box and secure all wiring.

WARNING Prior to performing any work on the refrigeration system, it is required that the unit be de-energized.

Replacement of Compressor Motor

1. Evacuate the refrigerant from the system using a refrigeration vacuum pump.

NOTE: Federal laws require the proper handling and disposal of refrigerant. It is unlawful to release any refrigerant into the atmosphere.

2. Disconnect the electrical power to the unit. This is done by turning off the circuit in the main supply panel. It should be noted on the panel that the refrigerator is being serviced and that the breaker must remain off.

3. To reach the condensing unit, the front ventilation grill on the front of the cabinet must be removed. This is done by pulling the grill up vertically about one inch, out over the retainer angles and then down.

4. With the grill removed, use a 3/8" wrench or socket and ratchet to unscrew the mounting bolt that secures the condensing unit to the cabinet base.

5. Once the mounting bolt is removed, carefully slide the whole condensing unit forward - lifting it over the anglemounting clip at the front of the base. Due to extra copper coil refrigeration lines, the unit can be completely removed from the compartment and placed on the deck.

6. Find the electrical terminal box on the side of the compressor and remove the front cover. Disconnect the wires from the compressor. Remove the screws that attach the terminal box to the compressor. At this point, the compressor will be electrically detached.

Printed in USA 12/02

CORRECTIVE MAINTENANCE

21. Check the refrigeration tag on the unit for the number of ounces of refrigerant to place into the system for start-up. Monitor the pressure on both the suction and discharge sides of the manifold gauges. As the temperature in the storage area begins to fall, check the refrigerant flow through the sight glass. The unit is fully charged when there are no bubbles in the sight glass. If after five minutes of operation, bubbles are still present, it may be necessary to add more refrigerant (add refrigerant in small amount to keep from overcharging).

WARNING

Overcharging a refrigeration system can be dangerous.

If the system overcharge is sufficient enough to immerse the major parts of a hermetic compressor in liquid refrigerant, a situation has been created that when followed by unusual but possible circumstances, can lead to compressor housing seam separation or rupture.

The sequence of circumstances that can lead to compressor housing seam separation or rupture occurs in the following manner:

1. The system overcharge immerses the compressor motor, piston, connecting rods, cylinders, etc. in liquid refrigerant, thereby effectively forming a hydraulic block preventing the compressor from starting. This condition is known as locked rotor.

2. Electrical current continues to flow through the compressor motor windings that become, in effect, electric resistance heaters. The heat produced begins to vaporize the excessive liquid overcharge, causing a rapid increase in system pressure.

3. If the system compressor protective devices fail for any reason prior to or during this locked rotor heating cycle or cycles, liquid refrigerant may be vaporized sufficiently fast enough to raise the pressure within the system to extremes far greater that the housing or weld seam is designed to handle.

4. In some instances where the amount of refrigerant overcharge is critical in proportion to the system internal volume, the pressure reached can cause a compressor housing seam separation or rupture that can be hazardous.

The remedy to eliminate this exceedingly rare, but potential hazard is to use correct refrigerant charge amounts and techniques.

Middleby urges that all individuals responsible for training, teaching, or advising installation mechanics and service personnel emphasize proper charging techniques. In addition, Middleby advises strict adherence to refrigerant charge amounts specifically recommended by the manufacturer of the refrigeration, air conditioning, or heat pump system.

Replacement of Low Pressure Control

1. Disconnect the unit from electrical service.

2. Remove control cover and disconnect electrical terminals.

3. Disconnect capillary tube.

4. Remove mounting fasteners on control base and install new control by reversing the procedure.

5. To adjust the control, hook up the service gauges to the suction and discharge valves and crack them to allow the gauges to read.

6. Using a standard screwdriver, coarse adjust the control by turning the adjustment screws on top of the control. Preset the cut-in and cutout and 68 lbs. and 38 lbs. respectively for a refrigerator and 25 lbs. and 10 lbs. respectively for a freezer.

7. Start the system. Allow it to run for five minutes. Monitor the low side pressure. Fine adjustments will be required to achieve the prescribed cycling pressures.

NOTE: Running the suction valve in or out as required to effectively change the pressures can speed up the control adjustment process.

Replacement of Thermal Expansion Valve (TXV)

1. Close liquid valve and run compressor until it pumps refrigerant into the receiver (low side service gauge will read 1 lbs.). Close the suction line valve.

2. Disconnect the sensor bulb on the suction line.

3. Disconnect the liquid line (1/4") and suction line (3/8") then remove the TXV.

4. Install new TXV, reconnect lines, and re-fasten the sensor bulb.

NOTE: It is not recommended to adjust the valve super heat as this comes pre-set from the factory.

Replacement of Filter Dryer

1. Close liquid line valve and run compressor until the low side refrigeration gauge indicates zero lbs., then close suction.

2. Remove filter dryer from system and replace with new dryer.

3. Purge system and add refrigerant if needed.

Replacement of Condenser Fan Motor

1. Disconnect all electrical power to the unit.

2. Remove the condensing unit from the condensing unit compartment.

CORRECTIVE MAINTENANCE

Printed in USA 12/02

3. Remove the protective wire shroud from around the motor.

4. Disconnect the fan motor leads from the terminal box on the compressor.

5. Remove the mounting screws at the motor base.

6. Using an allen wrench, remove the aluminum fan.

7. To install the new motor, reverse the process.

Replacement of the Condensing Fan

1. Disconnect all electrical power to the unit.

2. Remove the condensing unit from the condensing unit compartment.

3. Remove the protective wire shroud from around the motor.

4. Using an allen wrench, loosen the set screw on the blade hub and slide the blade from the shaft.

5. Reverse the procedure to reassemble.

Replacement of the Anti-Condensate Heater

NOTE: The anti-condensate heater is located behind the front edge of the vinyl breakers in the door opening.

1. Disconnect all electrical power to the cabinet.

2. Remove vinyl breakers by exerting pressure at the front edge toward the center of the door.

3. Disconnect anti-condensate heater wiring connection.

4. Remove heater from recessed rail.

5. Replace new heater in rail and reconnect electrical.

Replacement of Drawer Gasket

1. Remove the gasket by pulling it out of the snap-in track.

2. Clean the gasket track and the immediate area.

3. Snap new gasket into retainer.

Replacement of Power Switch

1. Shut off all electrical power going to the unit.

2. Remove the front air grill.

3. Using a flat blade screwdriver, remove the cover plate with the switch attached.

4. Remove the wires connected to the switch.

5. Unscrew the lock washer and remove the switch.

6. Reverse the process when installing the new switch.

Replacement of the Drain Line

NOTE: To replace the vinyl drain line, it is necessary that there be access to the rear of the cabinet.

1. On the cabinet exterior, remove the rear tubing cover using a 1/4" nut driver.

2. On the interior of the cabinet, remove the drain line cover.

3. From the inside of the cabinet, pull the drain from the evaporator shroud fitting.

4. From the drain exit location, pull the drain through the penetration of the cabinet.

5. At the bottom of the condensing unit compartment, cut the drain line retaining strap. The drain line should now be free.

6. To install the new drain line, reverse the process.

CHARGING THE REFRIGERATION SYSTEM

1. Connect service gauges to the suction and discharge service valves then open valves one full turn.

2. If the system is pressurized slightly, open both manifold gauge valves and purge the service line gauges.

3. With manifold gauge valves closed, start refrigeration system.

4. Attach a drum of refrigerant to the suction service side of the manifold gauges and add refrigerant until the liquid sight glass is clear of bubbles.

RECALIBRATING THE THERMOMETER

1. To recalibrate the thermometer, remove it from the cabinet. Using a small, flat screwdriver, remove the lens. Prepare an ice water bath and immerse the thermometer bulb at least two inches into the ice bath. Within 30 seconds the indicator dial should read 32 degrees Fahrenheit. If it does not, it needs to be recalibrated. Do this by placing your index finger on the opposite side of the needle that needs to move. Then, using a flat screwdriver, turn the screw at the center of the dial 1/4 of a turn in the direction you want to move the dial. Repeat the procedure until the needle is on 32 degrees. See Figure 4.1.

Printed in USA 12/02

PARTS LIST

INTRODUCTION

This section of the manual contains lists of replaceable parts. Each of the tables contains a list of removable parts associated with an assembly of the cabinet or refrigeration system. No parts identification has been provided for details of permanently assembled items or those that are not suitable for field repair.

Table 7.1 is a parts list of special tools required for routine service.

Table 7.1 - Parts List - Special Tools List

Part Number Description Quantity

R1412 Refrigerant service gauges with hoses 1

VA70264 Service valve wrench 1

50992 Refrigerant 30 lbs.

PARTS LIST

Printed in USA 12/02

Drawer Cartridge 18" DSB18C Middleby 1

Gasket GSB60MV 6449 Jeans 2

Recessed Pulls HXHL08 P73-2000 Component Hardware 2

Drawer Rollers HXDW02 7319000201 Kason 8

Heater Wire L1HR64 64" Refrigeration Hdwe. 1

Leg nut CNNP01MS 3/4" large hex nut Best Bolt 4

Parts List - Cabinet

20036SB

Item Middleby# Mfg# Vendor Qty

Table 7.2 - Parts List

Evaporator Coil Assy. RWE430 BBM11A Heatcraft 1 Evaporator Motor RWEM03 25300701 Heatcraft 1 Evaporator Fan RWE5101B 5101B Heatcraft 1 Expansion Valve RWEV39 EFS1/4C Sporlan 1 Thermostat RWTT08 A319ABC-24-01 Johnson Controls 1 Condensing Unit RUT220 AEA9422ZXAEC Tecumseh 1 Compressor RUT221 AEA590AT-946-A2 Tecumseh 1 Condenser RWCD17 50837 Tecumseh 1 Condenser Fan Blade RWFB20 51561 Tecumseh 1 Condenser Fan Motor RWCM05 810M006B45 Tecumseh 1 Receiver RWRT04 51080 Tecumseh 1 Start Capacitor RWCP42 858S165A47 Tecumseh 1 Run Capacitor - - - Relay RWRLY09 820RR12B79 Tecumseh 1 Overload RWOVL05 8300MRTE59 Tecumseh 1 Filter Dryer RWFD02 C-052-S Sporlan 1 Sight Glass RWSG01 SG-114 Watsco 1 Pressure Control RWPL02 010-1483 Ranco 1 Power Control Switch LWTS01 - Middleby 1 Power Cord MT-004 115V - 1 Wire Harness LH041 - - 1

Parts List - Refrigeration

20036SB

Item Middleby# Mfg# Vendor Qty

Printed in USA 12/02

PARTS LIST

Drawer Cartridge 26" DSB26C Middleby 1

Gasket GSB62MV 6449 Jeans 2

Recessed Pulls HXHL08 P73-2000 Component Hardware 2

Drawer Rollers HXDW02 7319000201 Kason 8

Heater Wire L1HR82 82" Refrigeration Hdwe. 1

Leg nut CNNP01MS 3/4" large hex nut Best Bolt 4

Parts List - Cabinet

20048SB

Item Middleby# Mfg# Vendor Qty

Parts List - Refrigeration

20048SB

Item Middleby# Mfg# Vendor Qty

PARTS LIST

Printed in USA 12/02

Drawer Cartridge 31" DSB31C Middleby 1

Gasket GSB64MV 6449 Jeans 2

Recessed Pulls HXHL08 P73-2000 Component Hardware 2

Drawer Rollers HXDW02 7319000201 Kason 8

Heater Wire L1HR90 90" Refrigeration Hdwe. 1

Leg nut CNNP01MS 3/4" large hex nut Best Bolt 4

Parts List - Cabinet

20060SB

Item Middleby# Mfg# Vendor Qty

Parts List - Refrigeration

20060SB

Item Middleby# Mfg# Vendor Qty

Printed in USA 12/02

PARTS LIST

Drawer Cartridge 26" DSB26C Middleby 2

Gasket GSB62MV 6449 Jeans 4

Recessed Pulls HXHL08 P73-2000 Component Hardware 4

Drawer Rollers HXDW02 7319000201 Kason 16

Heater Wire L1HR82 82" Refrigeration Hdwe. 2

Leg nut CNNP01MS 3/4" large hex nut Best Bolt 4

Parts List - Cabinet

20072SB

Item Middleby# Mfg# Vendor Qty

Evaporator Coil Assy. RWE450 BBM16A Heatcraft 1 Evaporator Motor RWEM03 25300701 Heatcraft 1 Evaporator Fan RWE5101B 5101B Heatcraft 1 Expansion Valve RWEV39 EFS1/4C Sporlan 1 Thermostat RWTT08 A319ABC-24-01 Johnson Controls 1 Condensing Unit RUT390 AKA9429ZXAEC Tecumseh 1 Compressor RUT391 AK174AT-0388-A9-8-952 Tecumseh 1 Condenser RWCD14 50840-1 Tecumseh 1 Condenser Fan Blade RWFB05 51551 Tecumseh 1 Condenser Fan Motor RWCM06 810M009B48 Tecumseh 1 Receiver RWRT03 81080-1 Tecumseh 1 Start Capacitor RWCP47 85PS165A53 Tecumseh 1 Run Capacitor - - - Relay RWRLY07 82498-1 Tecumseh 1 Overload RWOVL38 8300CRAN21 Tecumseh 1 Filter Dryer RWFD02 C-052-S Sporlan 1 Sight Glass RWSG01 SG-114 Watsco 1 Pressure Control RWPL02 010-1483 Ranco 1 Power Control Switch LWTS01 - Middleby 1 Power Cord MT-004 115V - 1 Wire Harness LH041 - - 1

Parts List - Refrigeration

20072SB

Item Middleby# Mfg# Vendor Qty

PARTS LIST

Printed in USA 12/02

Drawer Cartridge 31" DSB31C Middleby 2

Gasket GSB64MV 6449 Jeans 4

Recessed Pulls HXHL08 P73-2000 Component Hardware 4

Drawer Rollers HXDW02 7319000201 Kason 16

Heater Wire L1HR90 90" Refrigeration Hdwe. 2

Leg nut CNNP01MS 3/4" large hex nut Best Bolt 6

Parts List - Cabinet

20084SB

Item Middleby# Mfg# Vendor Qty

Parts List - Refrigeration

20084SB

Item Middleby# Mfg# Vendor Qty

Printed in USA 12/02

PARTS LIST

Drawer Cartridge 18" DSB18C Middleby 2

Drawer Cartridge 26" DSB26C Middleby 2

Gasket GSB64MV 6449 Jeans 4

Gasket GSB62MV 6449 Jeans 4

Recessed Pulls HXHL08 P73-2000 Component Hardware 6

Drawer Rollers HXDW02 7319000201 Kason 24

Heater Wire L1HR90 64" Refrigeration Hdwe. 1

Heater Wire L1HR82 82" Refrigeration Hdwe. 2

Leg nut CNNP01MS 3/4" large hex nut Best Bolt 6

Parts List - Cabinet

20096SB

Item Middleby# Mfg# Vendor Qty

Evaporator Coil Assy. RWE450 BBM16A Heatcraft 1 Evaporator Motor RWEM03 25300701 Heatcraft 1 Evaporator Fan RWE5101B 5101B Heatcraft 1 Expansion Valve RWEV39 EFS1/4C Sporlan 1 Thermostat RWTT08 A319ABC-24-01 Johnson Controls 1 Condensing Unit RUT520 FJCF-A050-IAA-201 Copeland 1 Compressor RUT511 RS43C1E-IAA-100 Copeland 1 Condenser RWCD37 066-0303-00 Copeland 1 Condenser Fan Blade RWFB08 083-0130-00 Copeland 1 Condenser Fan Motor RWCM27 050-0259-12 Copeland 1 Receiver RWRT12 577-0346-02 Copeland 1 Start Capacitor RWCP03 014-0008-57 Copeland 1 Run Capacitor - - - Relay RWRLY02 040-0102-00 Copeland 1 Overload RWOVL02 071-0329-15 Copeland 1 Filter Dryer RWFD02 C-052-S Sporlan 1 Sight Glass RWSG01 SG-114 Watsco 1 Pressure Control RWPL02 010-1483 Ranco 1 Power Control Switch LWTS01 - Middleby 1 Power Cord MT-004 115V - 1 Wire Harness LH041 - - 1

Parts List - Refrigeration

20096SB

Item Middleby# Mfg# Vendor Qty

PARTS LIST

Printed in USA 12/02

Drawer Cartridge 26" DSB26C Middleby 3

Gasket GSB62MV 6449 Jeans 6

Recessed Pulls HXHL08 P73-2000 Component Hardware 6

Drawer Rollers HXDW01 7319000201 Kason 24

Heater Wire L1HR82 82" Refrigeration Hdwe. 3

Leg nut CNNP01MS 3/4" large hex nut Best Bolt 6

Parts List - Cabinet

20108SB

Item Middleby# Mfg# Vendor Qty

Evaporator Coil Assy. RWE450 BBM16A Heatcraft 1 Evaporator Motor RWEV03 25300701 Heatcraft 1 Evaporator Fan RWE5101B 5101B Heatcraft 1 Expansion Valve RWEV39 EFS1/4C Sporlan 1 Thermostat RWTT08 A319ABC-24-01 Johnson Controls 1 Condensing Unit RUT520 FJCF-A050-IAA-201 Copeland 1 Compressor RUT511 RS43C1E-IAA-100 Copeland 1 Condenser RWCD37 066-0303-00 Copeland 1 Condenser Fan Blade RWFB08 083-0130-00 Copeland 1 Condenser Fan Motor RWCM27 050-0259-12 Copeland 1 Receiver RWRT12 577-0346-02 Copeland 1 Start Capacitor RWCP03 014-0008-57 Copeland 1 Run Capacitor - - - Relay RWRLY02 040-0102-00 Copeland 1 Overload RWOVL02 071-0329-15 Copeland 1 Filter Dryer RWFD02 C-052-S Sporlan 1 Sight Glass RWSG01 SG-114 Watsco 1 Pressure Control RWPL02 010-1483 Ranco 1 Power Control Switch LWTS01 - Middleby 1 Power Cord MT-004 115V - 1 Wire Harness LH041 - - 1

Parts List - Refrigeration

20108SB

Item Middleby# Mfg# Vendor Qty

Printed in USA 12/02

PARTS LIST

Drawer Cartridge 18" DSB18C Middleby 2

Drawer Cartridge 26" DSB26C Middleby 2

Gasket GSB60MV 6449 Jeans 4

Gasket GSB62MV 6449 Jeans 4

Recessed Pulls HXHL08 P73-2000 Component Hardware 8

Drawer Rollers HXDW01 7319000201 Kason 32

Heater Wire L1HR64 64" Refrigeration Hdwe. 2

Heater Wire L1HR82 82" Refrigeration Hdwe. 2

Leg nut CNNP01MS 3/4" large hex nut Best Bolt 6

Parts List - Cabinet

20120SB

Item Middleby# Mfg# Vendor Qty

Evaporator Coil Assy. RWE450 BBM16A Heatcraft 1 Evaporator Motor RWEM03 25300701 Heatcraft 1 Evaporator Fan RWE5101B 5101B Heatcraft 1 Expansion Valve RWEV39 EFS1/4C Sporlan 1 Thermostat RWTT08 A319ABC-24-01 Johnson Controls 1 Condensing Unit RUT520 FJCF-A050-IAA-201 Copeland 1 Compressor RUT511 RS43C1E-IAA-100 Copeland 1 Condenser RWCD37 066-0303-00 Copeland 1 Condenser Fan Blade RWFB08 083-0130-00 Copeland 1 Condenser Fan Motor RWCM24 050-0259-12 Copeland 1 Receiver RWRT12 577-0346-02 Copeland 1 Start Capacitor RWCP03 014-0008-57 Copeland 1 Run Capacitor - - - Relay RWRLY02 040-0102-00 Copeland 1 Overload RWOVL02 071-0329-15 Copeland 1 Filter Dryer RWFD02 C-052-S Sporlan 1 Sight Glass RWSG01 SG-114 Watsco 1 Pressure Control RWPL02 010-1483 Ranco 1 Power Control Switch LWTS01 - Middleby 1 Power Cord MT-004 115V - 1 Wire Harness LH041 - - 1

Parts List - Refrigeration

20120SB

Item Middleby# Mfg# Vendor Qty

INSTALLATION

Printed in USA 12/02

UNPACKING

Note: Before unpacking the unit, note any crate markings and check for damage to crating. Notify the carrier if there should appear to be damage to the unit.

The unit is shipped directly from the manufacturing factory securely fastened to a single pallet then protected by an external wrapping.

1. After inspection, carefully remove all external wrappings and other protective coverings.

2. Review the installation section of the manual completely prior to installing the unit.

3. Discard crating materials.

INSTALLATION

1. Before moving the unit to the installation sight, doublecheck passageways to ensure that the unit will move through without modification.

Note: In certain instances, it may be necessary to remove the drawers. This will allow the unit to fit through tighter spaces.

2. Position the unit to allow for sufficient ventilation. Typically, approximately 3" clearance from walls and other equipment is sufficient.

3. Level the cabinet from front to back and side to side. This is important so that the cabinet will not be pulled out of square.

4. Evaporator coil drain lines are factory installed and are either plumbed into a condensate evaporator pan or the condensate evaporative base of the condensing unit to eliminate the need for exterior plumbing. Make certain that the drain outlet is located such that the condensate falls into the pan or base. On units with remotely located refrigeration, the condensate evaporator pan is optional.

5. Check the door gasket to make certain that it is sealing properly to the cabinet.

6. Before applying electrical power to the unit, you should first check the electrical characteristics of the condensing unit to ensure that they agree with those of the electrical supply source.

CAUTION Low or excessive voltage can severely damage the electrical system.

Note: Adjusting any valves or controls on the system is not necessary and may void your warranty. All valves and controls have been set by the factory.

When a condensing unit is supplied

Printed in USA 12/02

ELECTRICAL AND MECHANICAL

INTRODUCTION

This section of the manual contains drawings and schematics of the electrical and mechanical piping systems.

ELECTRICAL ABBREVIATIONS AND TERMINOLOGY

• RLA - Rated Load Amperage

Rated load amps is a measure of the current drawn by a compressor when operated at compressor manufacturer rating conditions at nominal voltage. This value is listed at U.L. and C.S.A. as "RLA". It is in agreement with the N.E.C. definition that the RLA be the current draw when the compressor is delivering rated output.

• LRA - Locked Rotor Amperage

The locked rotor amps of a compressor is the current value recorded three seconds after rated voltage is applied under locked rotor conditions from a 75 degree Fahrenheit motor soakout temperature (The voltage drop is to be predetermined and adjusted accordingly prior to testing). This value appears on the compressor serial plate and on all compressor statistics sheets.

It may be well to note that the practice in the past was to show an additional column marked, "LRA U.L. Test Report". This is no longer needed since the U.L. investigation work, regarding component rating, will be guided by the compressor manufacturer's published value.

• MCG - Maximum Continuous Current

Maximum continuous current is a limiting ampere value that must not be greater than 156% of the RLA of the compressor as marked on the nameplate of the particular unit into which that compressor is applied.

Table 9.1 - Operating Pressures

REFRIGERANT: R-12

Cabinet Ambient Suction Pressure Head Pressure

-5 degrees F (Fre.) 90 degrees F 0-10 lbs. 120-150 lbs.

37 degrees F (Ref.) 90 degrees F 18-35 lbs. 120-150 lbs.

REFRIGERANT: R-22

Cabinet Ambient Suction Pressure Head Pressure

-5 degrees F (Fre.) 90 degrees F 10-15 lbs. 200-250 lbs.

37 degrees F (Ref.) 90 degrees F 37-67 lbs. 200-250 lbs.

REFRIGERANT: 134A

Cabinet Ambient Suction Pressure Head Pressure

-5 degrees F (Fre.) 90 degrees F -5-10 lbs. 120-150 lbs.

37 degrees F (Ref.) 90 degrees F 16-37 lbs. 120-150 lbs.

REFRIGERANT: 404A

Cabinet Ambient Suction Pressure Head Pressure

-5 degrees F (Fre.) 90 degrees F 15-20 lbs. 250-300 lbs.

37 degrees F (Ref.) 90 degrees F 68-84 lbs. 250-300 lbs.

ELECTRICAL AND MECHANICAL

Printed in USA 12/02

Figure 9.1 - Electrical Schematic

Printed in USA 12/02

ELECTRICAL AND MECHANICAL

Figure 9.2 - Refrigeration Piping Schematic

LIMITED WARRANTY

Printed in USA 12/02

INTRODUCTION

Middleby warrants their cabinets and units to consumers only against defects in material or workmanship under normal use and service for a period of one year from the date of shipment. Middleby will repair or replace at their option, any part, assembly, or portion thereof, which, by their examination, is deemed to be defective. Middleby will pay the labor costs for the repair up to twelve (12) months from the date of shipment.

TERMS

Exclusions

• Middleby’s obligations under this warranty shall not extend to any malfunction or other problem caused by unreasonable use, such as, but not limited to, improper setting of controls, improper installation, improper voltage supply, loose electrical connections or blown fuses, and damage not attributable to a defect in workmanship. This warranty will not apply to any cabinet or component part that has been subject to any accident, abuse, misuse, damage caused by fire or floor or any other act of God, and to any product serviced by an unauthorized service person or company.

• Middleby will not accept responsibility for the labor costs related to service and repair of remote condensing units or other field installations.

• It remains the responsibility of the qualified refrigeration installation company to provide any accessories required for a specific climate or application. Middleby does not imply nor warrant the use of this equipment in adverse conditions or beyond its intended use.

To Secure Warranty Service

1. To claim a defect under this warranty, direct your claim to whomever you purchased the product. Be prepared to provide the model number, serial number, and a description of the problem.

2. If the above procedure fails to satisfy your claim, you may write directly to the Middleby, 1100 Old Honeycutt Road, Fuquay-Varina, NC 27526. Again, please provide the model number, serial number, and a description of the problem.

Note: There is no other express warranty on Middleby units except as stated herein. Any implied warrants of fitness and merchantability are limited in duration to the duration of this warranty. The liabilities of Middleby are limited solely and exclusively to replacement as stated herein and do not include any liability for any incidental, consequential, or other damages of any kind whatsoever, whether any claim is based upon theories of contract negligence or tort. Some states do not allow limitations on how long an implied warranty lasts, or the exclusion of limitations of incidental or consequential damages. So, the above limitations and exclusions may not apply to you. This warranty gives you specific legal rights and you may also have other rights that vary from state to state.

Printed in USA 12/02

NOTES

Blodgett 20120SB Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual