Service Manual REFRIGERATED BACK BAR
Contents
1. Outside Unit Be sure that the unit has access to ample air avoid hot corners and locations near stoves and ovens Leveling Be sure that the unit is placed on a firm flat surface floor Check for cracks in flooring or tile and avoid these areas if possible If necessary place support pads properly rated for the weight of the unit to bridge uneven or cracked flooring Level unit accordingly Stabilizing Use the leg adjustments to insure that the unit is solid to the floor surface at all four contact points Insure that the unit does not rock when pressure is applied to the top corners Electrical Connection The RUF 48 is available as a 120VAC 60 Hz or as a 220VAC 50 Hz dependent on model All electrical connections should be performed by a certified electrician and should comply with local electrical codes for your municipality WARNING REFER TO THE AMPERAGE DATA LIST IN THE SPECIFICATIONS OR THE SERIAL TAG DATA AND YOUR LOCAL CODE OR THE NATIONAL ELECTRICAL CODE TO BE SURE UNIT IS CONNECTED TO THE PROPER POWER SOURCE A PROTECTED CIRCUIT OF THE CORRECT VOLTAGE AND AMPERAGE MUST BE RUN FOR CONNECTION OF THE SUPPLY CORD OR PERMANENT CONNECTION TO THE UNIT THE POWER MUST BE TURNED OFF AND DISCONNECTED WHENEVER PERFORMING MAINTENANCE OR RE PAIR FUNCTIONS Me Service Manual for Refrigerated Back Bar Model RUF 48 MAINTENANCE Stainless Steel Care and Cleaning Stainless steel contains 70 80 iron2. for future reference ENS Service Manual for Refrigerated Back Bar Model RUF 48 CONTENTS SPECIFIGCALIONS p dmoiPekaapdcdidu UEM SE a pebequdd au abet sence ta S SM D eb SH UMEN UR ONMUEEC 4 INSTALEA TION mere PTT 4 LOCATON m 4 Iriside Ant iode edere aedes Rn nd nt n x nea nnd ten Ran om qu ap em nbi n a en Re Ek eni der d ena 4 OUTSIDE m A 4 E Cl em 4 eA NUN MARNE E SEE 4 Electrical Connection sessssssssssssssssssssssssssseeeeeeeneeennennne nnne nnne n hehehe nnne nnne nnne 4 Ul gliz7in elc 5 Stainless Steel Care and Cleaning sissie REM 5 PREVENTIVE MAIN TENANCE auciicasssiassstsantuoedacmnuabaerummennncanatduateaunanmcea vasa o itu to pace rcd EEN 6 Cleaning the Condenser STI PNE Et 6 Door Gasket Maintenance enne nennen nnns nennen rennen nnns 6 Drain Maintenance Base ssssssssssseee eene enne nennen nnne n nen n nennen rennen rennen renes 7 lx idbciric 2E cs zl ge EASE EES 7 Thermostat Replacement c cceeceecceeceeeeeaeeaaeeeaeeeaeeaaeeaaeeaeceaeeeaeceaeecaeceaeceaeeeaeeeeeeeeeeeeeseeeeeess 7 Evaporator Fan Replacement ssssssssssssesseeseeese eene hene AEE RARE 8 Refrigeration System PREDICTS IA socio ir Seat etdece ior t den triste ted Ra
3. Door Replacement and Adjustment General Doors may become misaligned during shipment but are easily adjusted 1 Foralow hanging door use a 3 8 open wrench to tighten but do not over tighten both top and bottom hinge screws 2 Place a flat screwdriver against outer side of bottom hinge and lightly tap with a hammer until door is properly aligned 3 If necessary place flat screwdriver against inner side of top hinge and tap lightly with hammer until door is properly aligned 4 After properly aligning doors tighten all hinge screws securely Door Gasket Replacement General The door gasket has a retaining panel 1 Remove gasket door panel and mounting screws Remove gasket and door panel Position new gasket and panel on door Secure with mounting screws Tighten screws evenly around door panel Recharging Refrigeration System General To analyze the performance of a refrigeration system temperature readings are recorded and converted to pressure readings using a standard pressure temperature chart When it is necessary to service a factory sealed refrigeration system and return it to its properly sealed condition strictly adhere to the following approved procedure Tools e Standard hand and refrigeration tools e Refrigerant Type R 134A Refer to data tag for amount Charging Procedure NOTE Priortorefrigeration system service special care mustbe taken during the evacuation process to r
4. Service Manual REFRIGERATED BACK BAR MODEL RUF 48 Please read this manual completely before attempting to install operate or service this equipment This manual is Copyright 2011 Duke Manufacturing Company All rights reserved Reproduction without written permission is prohibited Duke is a registered trademark of the Duke Manufacturing Company Duke Manufacturing Company 2305 N Broadway St Louis MO 63102 Phone 314 231 1130 Toll Free 1 800 735 3853 Fax 314 231 5074 www dukemfg com P N 219205B Service Manual for Refrigerated Back Bar Model RUF 48 iS IMPORTANT WARNING AND SAFETY INFORMATION WARNING READ THIS MANUAL THOROUGHLY BEFORE OPERATING INSTALLING OR PERFORM ING MAINTENANCE ON THE EQUIPMENT WARNING FAILURE TO FOLLOW INSTRUCTIONS IN THIS MANUAL CAN CAUSE PROPERTY DAMAGE INJURY OR DEATH WARNING DO NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPORS OR LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER APPLIANCE WARNING UNLESS ALL COVER AND ACCESS PANELS ARE IN PLACE AND PROPERLY SE CURED DO NOT OPERATE THIS EQUIPMENT CAUTION Observe the following Minimum clearances must be maintained from all walls and combustible materials Keep the equipment area free and clear of combustible material Adequate clearance for air openings e Operate equipment only on the type of electricity indicated on the specification plate e Retain this manual
5. brush For heavier dust use a vacuum or blow with compressed air For heavy grease use a degreasing agent made specifically for condenser coils on refrigeration units Spray the degreasing agent on the coil and then blow with compressed air Never wash with high pressure water which can damage the electrical components located at or near the condenser coil Door Gasket Maintenance Door gaskets require regular cleaning to prevent mold and mildew build up and to maintain elasticity for proper seal function Warm soapy water is adequate for cleaning the gasket Avoid using full strength cleaning products which can cause the gasket to become brittle and result in improper seal function Never scrape or clean the gasket with sharp tools or knives i Service Manual for Refrigerated Back Bar Model RUF 48 Drain Maintenance Base Located at the rear of each unit is a drain hose which removes the condensation from the evaporator coil and deposits it into a drain pan for evaporation see Figure 3 CAS NS e Drain Hose Drain Pan Figure 3 Location of Drain Hose and Drain Pan If excessive water accumulates inside the unit check to see that the drain hose is connected from the evaporator housing to the drain pan If water accumulates underneath the unit check to see that the drain hose is located above the drain pan A level unit is essential for proper drainage Be sure to provide a level s
6. emove air moisture and other non condensables from the system Duke Manufacturing recommends the following triple evacuation method Failure to follow this procedure may resultin poor refrigeration system performance 1 Evacuate system to 1500 microns 2 Break vacuum to 2 psig with dry nitrogen If dry nitrogen is unavailable use same type of refrigerant as used in system 3 Evacuate system to 500 microns The system is now ready to receive refrigerant charge according to information on data plate CAUTION Never use oxygen or acetylene in place of dry nitrogen or refrigerant AN for leak testing A violent explosion may result causing property damage personal injury or death When using nitrogen to pressure test always use a pressure regulator Failure to do so will result in extremely high pressure of the compressor or other system components and result in property damage personal injury and death NOTE Prior to repair ensure there is enough process hose approximately 12 present to complete the repair using the above procedure If not install a new process hose before repair sequence Service Manual for Refrigerated Back Bar Model RUF 48 iS 1 Install a temporary access valve on the high and low side of process hoses as close to factory crimps as possible 2 Usetemporary valves to perform repair Duke Manufacturing will not reimburse the cost of permanently installed valves 3 Aftercompleting r
7. epair evacuate systemusing thetriple evacuation method described in Duke Manufacturing Service Bulletin Number 26 4 After completing proper evacuation method recharge system using proper refrigerant according to information on data plate 5 Continue crimping process hose just below temporary valve and again 2 below crimp 6 With crimp tool in place remove temporary valve 7T Braze shut end of process hose 8 Allow to cool for about 5 minutes 9 Remove crimp tool 10 Check brazed end for leaks 10 i Service Manual for Refrigerated Back Bar Model RUF 48 TROUBLESHOOTING SYMPTOM CAUSE REMEDY Cabinet too warm Unit not plugged in Plug unit in Thermostat set too warm Set thermostat to a higher number for a colder temperature Thermostat switch stuck Replace thermostat open in coldest position Doors not sealing Adjust doors Torn or damaged door Replace gaskets gaskets Evaporator fan not running Check and repair or replace motor Condenser fan motor not Check and repair or replace motor running Dirty condenser coil or filter Clean coil or filter Refrigerant leak Find leak repair and recharge Thermostat set too cold Set thermostat to a lower number for a warmer temperature Cabinet too cold Thermostat switch is stuck Replace thermostat in the closed position Drain hose plugged Clear drain hose Drain hose loose or Tighten or connect drain hose Wate
8. hardware Remove evaporator fan Install replacement evaporator fan Install evaporator fan mounting hardware Using tags connect evaporator fan wiring Install sheet metal panel Install shelf support Install shelves Connect unit to power source and test Refrigeration System Replacement General The refrigeration system assembly is located in the rear of the unit 1 2 10 11 14 15 16 T Disconnect unit from power source Using a refrigeration charging unit evacuate refrigerant from the system according to Duke Manufacturing Service Bulletin Number 26 Remove expansion valve from refrigeration assembly Remove evaporator tubing from refrigeration assembly Remove refrigeration assembly mounting hardware Tag and disconnect wiring at junction box Remove wiring harness clamps Remove mounting nut from condenser coil tubing in drain pan Install replacement refrigeration assembly onto frame mounts Install mounting nut to condenser coil Install wiring harness clamps 12 13 Using tags connect wiring at junction box Install refrigeration assembly mounting hardware Install evaporator tubing to refrigeration assembly Install expansion valve to refrigeration assembly ChargesystemaccordingtoDukeManufacturing Service Bulletin Number 26 Connect unit to power source and test unit Mi Service Manual for Refrigerated Back Bar Model RUF 48
9. r in bottom of unit oo mom drain 11 Duke Manufacturing Company 2305 N Broadway St Louis MO 63102 Phone 314 231 1130 Toll Free 1 800 735 3853 Fax 314 231 5074 www dukemfg com P N 219205
10. u inud Sage iuURuanE 8 Door Replacement and Adjustment soucis tra ratae tetas vaa epe haa oP aat astutia Sua dU iinitan 9 Door Gasket Replacement cccccccecccceee eee eee cette eee e eee ttrt emen ene nen nnne nnn rn nne eren nene nnns 9 Recharging Refrigeration SySlerty uso ssducst ket Eaux Ra hK ra MUR ka EN dx eaa KRUGER NM RAS SEBEKR DN RUE NE irisean 9 Ec AE 9 Charging siis P Tc 9 TROUBLESHOOTING d rr 11 Service Manual for Refrigerated Back Bar Model RUF 48 iS SPECIFICATIONS MODEL DESCRIPTION VOLTAGE AMPS PH RUF 48 48 Refrigerated 120 VAC 60 Hz 6 4 1 Back Bar 220 VAC 50 Hz 3 2 1 MODEL DESCRIPTION HEIGHT WIDTH LENGTH RUF 48 48 Refrigerated 36 00 In 29 50 In 48 00 In Back Bar INSTALLATION Location The unit represented in this manual is intended for indoor use only Be sure the chosen location has a floor or counter strong enough to support the total weight of the unit Reinforce the floor or counter if necessary to provide for maximum loading For the most efficient operation be sure to provide good air circulation inside and out The outline dimensional drawing for the unit is shown below in Figures 1 0 Figure 1 48 Refrigerated Back Bar RUF 48 Inside Unit Provide adequate space along the front back and sides taking care to not block airflow to the fans 4
11. uctions Again always rub with the grain of the steel for best results CAUTION Never use an acid based cleanser Be sure to clean all food products AN from any stainless surface Many food products contain acid which can deteriorate the finish Common foods include tomatoes peppers and other vegetables WARNING THE POWER MUST BE TURNED OFF AND DISCONNECTED AT ALL TIMES DURING MAINTENANCE OR REPAIR FUNCTIONS Service Manual for Refrigerated Back Bar Model RUF 48 iS PREVENTIVE MAINTENANCE Cleaning the Condenser Coil 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 compres sor failure Neglecting the condenser coil cleaning procedures will void all warranties and repair or replacement costs associated with the compressor CAUTION Toclean the condenser never use ahigh pressure water wash which AN can damage electrical components located at or near the condenser coil Air Filter Condensor Coil Figure 2 Location of Condensing Coil and Air Filter The condenser coil is located and accessed at the rear of the unit see Figure 2 The condenser coil requires regular cleaning and should be done every 60 days However if large amounts of dust and grease accumulate sooner clean the condenser coil every 30 days For light dust use a soft non wire
12. urface below the unit especially if the floor is not level Keep the drain pan free from dirt dust and debris to prevent water from backing up and overflowing from the drain pan onto the floor PARTS REPLACEMENT Thermostat Replacement General The thermostat is located inside the cooling compartment and is accessible through the doors Disconnect unit from power source Remove shelves Remove shelf support Remove sheet metal panel Remove thermostat from back panel oa fF WN Remove thermostat probe from evaporator coil A Tag and disconnect thermostat wiring Remove thermostat from unit Install replacement thermostat NOTE Do not kink thermostat probe NOTE To ensure proper operation place 8 of thermostat probe into evaporator coil 10 Install thermostat probe in evaporator coil 11 Using tags connect thermostat wiring 12 Install sheet metal panel 13 Install shelf support 14 Install shelves 15 Connect unit to power source and test Service Manual for Refrigerated Back Bar Model RUF 48 iS Evaporator Fan Replacement General The evaporator fan is located and accessed inside the cooling compartment and is removed as an assembly from the back panel ON Oar WOW DN ek X X ike 2 AA OO N gt O Disconnect unit from power source Remove shelves Remove shelf support Remove sheet metal panel Tag and disconnect evaporator fan wiring Remove evaporator fan mounting
13. which will rust It also contains 12 3096 chromium which forms an invisible passive film over the steel surface and acts as a shield against corrosion As long as the protective film remains intact the metal will not corrode However if the film is broken or contaminated outside elements can begin to breakdown the steel and begin to form rust or discoloration To prevent rust and discoloration on stainless steel several important steps need to be taken CAUTION Never use steel wool pads or wire brushes or scrapers Avoid AN cleaning solutions that contain alkaline or chloride Use alkaline based or non chloride cleaning solutions Anything containing chloride will damage the protective film on stainless steel Chlorides are found in household and industrial cleaners and also in hard water and salts If a chloride or alkaline cleaner has been used rinse repeatedly and dry thoroughly Always use only soft cloths or plastic scouring pads For routine cleaning use warm soapy water For stubborn stains use a non abrasive cleanser For heavy grease use a degreaser For best results rub with the grain of the steel Pitting and cracking are early signs of stainless steel breakdown Special stainless steel cleaners can restore and preserve the protective film If signs of breakdown appear thoroughly clean and dry all surfaces Begin regular application of a high quality stainless steel cleaner according to the manufacturer s instr
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