Hoshizaki America, Inc.
Contents
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3. Evaporator Evaporator Fan Motor Fig 3 35 B Removal and Replacement of Compressor CAUTION 1 Always install a new drier every time the sealed refrigeration system is opened 2 Do not replace the drier until after all other repair or replacement has been made Install the new drier with the arrow on the drier in the direction of the refrigerant flow 3 When brazing protect the drier by using a wet cloth to prevent the drier from overheating Do not allow the drier to exceed 250 F 121 C Note When replacing a compressor it is recommended to install a new start relay start capacitor and external compressor overload refrigerator Due to the ability of the POE oil in the compressor to absorb moisture quickly the compressor must not be opened more than 15 minutes for replacement or service 1 Move the power switch to the OFF position then unplug the unit 2 Recover the refrigerant and store it in an approved container See V A Service for Refrigerant Lines 3 Remove the compressor terminal cover and disconnect the wires from the compressor 4 Remove the discharge suction and process pipes 5 Remove the hold down screws clips and rubber grommets 6 Remove the compressor 7 Attach the rubber grommets to the new compressor 8 Place the new compressor in position and secure it using the screws and clips 9 Remove the drier then place the new drier in position 10 Remove plugs f
4. 23 LBLULc rte 24 2 Freezer m 25 B Control Module H C susana may qaran baqqa 28 Thermistor Checkin a a 29 D Diagnostic tap 30 1 Unit Not ONG RR 30 2 Evaporator is Frozen UD T 32 SNB oz XI 32 eR 32 V Removal and Replacement of 45 33 A Service O AA rn 33 1 Refrigerant Recovery RN in 33 2 Brazing NN TTE 34 3 Evacuation and Recharge risa 34 B Removal and Replacement of COMpresSoF ccccccccnnnnnnnnnnnnonononnnnnonononononnnnnnnnnnnnnannnnns 36 C Removal and Replacement of 37 D Removal and Replacement of CondenSeT oooccccnnnnnocinononononoonnononnnononononcncnnnnoninnnanananas 39 E Removal and Replacement of Expansion Valve 2 Section Freezer 40 F Removal and Replacement of Evaporator Fan Motor cccccceceeeeeeeeneeeeseeeeseeeeeeees 41 G Removal and Replacement of Condenser Fan 41 H Removal and Replacement of Control 11 42 Removal and Replacement of 1510 5 43 J Removal and Replacement of Condensate 45 K Removal and Replacement of Door 5 46 L Door FEF O M aaa ad lala siu ox elena iba 46 VlsCleaning MSU eb NEM 46 Important Safety I
5. Condenser Fan Motor Power Switch Condenser Condensate Pump Air Filter Front Panel Power Cord Float Switch N Control Box Cover Bracket Control Box tM Float Switch gt Control Module Door Switch Light Reservoir Reservoir Cover Display Module Door Switch NI Door Gasket 1 I I I r I I I r I r I I r r 1 1 1 LI I I e Evaporator e Cabinet Thermistor e Defrost Thermistor e Evaporator Fan Shroud Model Shown CF2A HS CR2A FS HS and CF2A FS HS 9 Door Door Latch B Sequence of Operation 1 Sequence Cycles and Shutdown The steps in the sequence are as outlined below Note 1 There is a slight delay at startup 2 There is a 2 minute minimum Comp on time and a 2 minute minimum Comp off time 3 EvapFM de energizes when door is opened on FS and when upper door is opened on HS 4 A float switch controlled condensate pump located on top of the unit is used to pump evaporator condensation to the condensate pan 5 On freezers EvapFM is de energized during defrost a Refrigerator 1 Startup Cool Down EvapFM MH and PH energize There is a slight delay before cabinet temperature appears on DM and Comp and ConFM energize 2 Cool Down Achi
6. HIN 2 NJuo2 2 dwog 21 NJdeA3 21 NJdeA3 1 syes 19414 I yo dwog uiw z 903 409 juiod as ynejep 264 AOQE iuiodies M l q 0 61 4 9 8 p 2 21 4 6 o Y 0 71 4 6 91002 410 1 SULEM 412 Y 9 009 412 syes 19411 Aey p Aejdsip einye1eduuoe Os v 4 07 O SULIEM ULG Spejs Jow uo duo uiui z lt 01 u09 ut 410 4 ouo ui y 19 2 Hd 21 HIN pezifieus duio9 2 14062 UO J9MOd dnueis 1e ee 1 uejseg umog 1002 IL 40116 141181 1soJJog S 1SO1J9Q t p A lu y UMOG 1002 Z umog 00 dn1 1818 Heya M0J J souaenbas 10 e19611J9y 14816 12 b Freezer yenuew uo duo l 51 815 NJde 3 syes aul Aey p dwog uiu g 2 81 4 sugs ow ejep 1 Aeyds p einje1eduue einuiu e 91161681 1501J9p enueu uo 1deoxo sugs 19414 Aejap NJde 3 ulw g 1 669 01 SUIEM 410 i 9 0 Joze Mojeq 10 1e S 10 i euin Soap LUNWIXeW 4nou L y euun 1s0JJep LUNWIUILW ejnuiu g 6 ju si e1nje1edujej uoneuiuue 50 ueuM syes sawn Aejap Aejdsip ainyesodwe ejnuru e 1 au SI uoneuiuue 1s0JJep uauM sues 12w ejep N Jde 3 ejnuiu g yew s uomeuruuej 150 UBYM 511616 Jeuun Aejap dwog
7. 9 Defrost Temperature Time Initiated Defrost Once DTh cools to 32 F 0 C a 4 hour cumulative Comp run timer starts Once DTh is at or below 32 F 0 C and 4 hour cumulative Comp run timer terminates MH and PH continue DH energizes and Comp ConFM and EvapFM de energize Defrost Termination DTh warms to 59 F 15 C MH and PH continue DH de energizes 3 minute Comp delay timer starts 8 minute EvapFM delay timer starts 3 minutes on manually initiated defrost and 13 minute temperature display delay timer starts 3 minute Comp delay timer terminates Comp and ConFM energize 5 minutes later 8 minute EvapFM delay timer terminates and EvapFM energizes 5 minutes after that 13 minute temperature display delay timer terminates and cabinet temperature appears on DM Defrost Diagnosis Defrost Initiation Has DTh cooled to 32 F 0 C or lower Confirm DTh status See IV C Thermistor Check Has 4 hour Comp cumulative run timer satisfied Check that Comp ConFM and EvapFM de energize If not check for 115VAC between CM C1 and CM N5 then between CM F6 and CM N5 If 115VAC is present CM is defective and must be replaced Confirm DH energizes If not check for 115VAC between CM H4 and If 115VAC is not present and DTh is in proper range CM is defective and must be replaced If 115VAC is present confirm DH amp draw and continuity Defrost Termination Has DTh warmed to 59 F 15 C If not yet confirmed confirm D
8. 9 Attach the expansion valve bulb to the suction line in the same location as the previous bulb The bulb should be between the 10 and 2 o clock position on the tube Be sure to secure the bulb with the clamp and holder and to insulate it 10 Place the expansion valve cover in position 11 Plug the unit back in Move the power switch to the ON position 40 F Removal and Replacement of Evaporator Fan Motor 1 Move the power switch to the OFF position and unplug the unit 2 Remove the evaporator fan shroud Remove the cabinet thermistor from the evaporator fan shroud 3 Remove the screws securing the evaporator fan bracket and ground wire then remove the evaporator fan bracket and evaporator fan motor 4 Remove the evaporator fan motor bracket and fan blade from the evaporator fan motor and secure them to the new evaporator fan motor 5 Install the new evaporator fan motor assembly and reconnect the evaporator fan motor ground wire WARNING To reduce the risk of electric shock be sure to reconnect the evaporator fan motor ground wire 6 Route the fan motor wires to the control box Do not connect wires in the cabinet area Disconnect the old wires and reconnect the new wires 7 Replace the cabinet thermistor and evaporator fan shroud in their correct positions 8 Plug the unit back in Move the power switch to the ON position c k IB Evaporator Fan Motor Bracket i Evaporator Fan 2 Fig 5
9. 3 Remove the condensate pump 4 Place the new condensate pump in position and connect the wires 5 Route the condensate pump tubing 6 Plug the unit back in Move the power switch to the ON position Condensate Pump Float Switch Control Box Fig 11 45 K Removal and Replacement of Door Gasket Remove old gasket by pulling it directly out of the vinyl gasket retainer Thoroughly clean the gasket area with mild soap and water prior to installing the new gasket The new gasket should be installed by assembling it at the corners first then working toward the center at the top bottom and sides The arrow shaped portion of the gasket should be firmly seated in the retainer groove for proper assembly This can be checked by lifting the edge of the gasket and observing the engagement CAUTION In order to get a proper gasket fit it is important not to stretch gasket material during assembly L Door Re Hinging The doors are reversible See the table below Instructions for re hinging are included in the kits Door Type Kit Number Right to Left HS 4016 Left to Right HS 4017 Right to Left HS 4018 Left to Right HS 4019 VI Cleaning Instructions T Stainless Steel Exterior Wipe the exterior occasionally with a clean soft cloth Use a damp cloth containing a neutral cleaner to wipe off oil or dirt build up Interior Spills should be wiped up promptly to avoid unpleasant odors The
10. G Removal and Replacement Condenser Fan Motor 1 Move the power switch to the OFF position and unplug the unit 2 Disconnect the condenser fan motor ground wire then remove the condenser fan guard and condenser fan motor 3 Remove the condenser fan blade then remove the condenser fan guard from the Condenser Fan Motor condenser fan motor and secure it and the 7 condenser fan blade to the nevv condenser fan motor 4 Install the nevv condenser fan motor assembly 31 1 5 Connect the condenser fan motor wires GS and ground wire WARNING To reduce 1 the risk of electric shock be sure to reconnect the ground wire 6 Plug the unit back in Move the power switch to the ON position Condenser Fan Guard 41 H Removal and Replacement of Control Module 1 Move the power switch to the OFF position then unplug the unit 2 Remove the control box cover 3 Disconnect the display cable defrost thermistor and cabinet thermistor from the control module 4 Remove the nut securing the control module to the control box 5 Note the position of the wires on the control module s lower terminals Remove the wires from the lower terminals and connect them to the same terminals on the replacement control module 6 Fasten the control module to the control box 7 Connect the display cable defrost thermistor and cabinet thermistor to the control module 8 Replace the control box cover
11. W circuit to the cabinet light When the door switch relay energizes door closed relay contact terminals 6 white W and 3 dark blue DBU close to complete the neutral wire white W circuit to the evaporator fan motor This switching of the neutral wire differs from conventional switching of the power wire The diagnostic procedure 16 basically a sequence check that allows you to diagnose the electrical system and components Before proceeding check for correct installation and proper voltage per unit nameplate As you go through the diagnostic procedure check to assure the components energize and de energize correctly If not those components or controls are suspect Always choose a white W neutral wire to establish a good neutral connection when checking high voltages 11 the display module 16 in alarm see ILD 2 Alarm Safeties For further details see IV B Control Module Check For factory default settings see II C 2 a Default Settings IMPORTANT The maximum allowable voltage variation is 10 percent of the nameplate rating 115VAC is used as a reference voltage when checking voltage to components Voltage may vary depending on power supply Move the power switch to the OFF position Unplug the unit from the electrical outlet Remove the control box cover Plug the unit back into the electrical outlet Move the power switch to the ON position Confirm proper supply voltage 115VAC to the power swi
12. condenser fan motor energize as soon as the defrost thermistor termination temperature is satisfied See Defrost Termination under IV A 1 9 Defrost and IV C Thermistor Check If components fail to start control module must be replaced Freezer Compressor and condenser fan motor energize 3 minutes after defrost termination temperature is satisfied Evaporator fan motor energizes 5 minutes after that except manual defrost and the cabinet temperature appears on the display module 5 minutes after the evaporator fan motor energizes See Defrost Termination under IV A 2 9 Defrost and IV C Thermistor Check If components fail to start control module must be replaced C Thermistor Check In the event the cabinet thermistor reading is out of range E1 alarm the compressor operates on a fixed time basis of 5 minutes on and 5 minutes off In the event the refrigerator defrost thermistor reading is out of range E2 alarm defrost initiation occurs every 4 hours of cumulative compressor run time and terminates on 20 minute minimum defrost timer In the event the freezer defrost thermistor reading is out of range E2 alarm defrost initiation occurs every 4 hours of cumulative compressor run time and terminates based on cabinet thermistor temperature To check thermistor resistance follow the steps below 1 Move the power switch to the OFF position then unplug the unit 2 Remove the control box cover 3 Disconnect and remove th
13. defective and must be replaced If CR is good and Comp or ConFM are not energized check for 115VAC at Comp terminals Comp overload internal on 1 section start components and Comp and ConFM motor winding continuity If Comp and ConFM are energized and the cabinet does not cool down check for a restriction in the refrigeration circuit correct TXV operation if applicable and correct refrigerant charge C HPS Activation Confirm ConFM is energized and fan blade turns freely Check that the condenser coil is not clogged or restricted Check that there are no restrictions in the refrigeration circuit drier TXV Confirm that the location meets factory requirements This unit is not intended for outdoor use Normal operating ambient temperature should be within 45 F to 100 F 7 C to 38 C The unit should not be located next to ovens grills or other high heat producing equipment The unit should not be located in a corrosive environment The unit should be a minimum of 4 11 cm from side walls A minimum of 10 25 cm overhead clearance should be provided for proper ventilation 8 Cool Down Achieved CTh cools to 3 F 1 7 C below setpoint EvapFM MH and PH continue Comp and ConFM de energize Diagnosis If Comp and ConFM do not de energize confirm CTh status See IV C Thermistor Check If CTh ohm reading is in proper range and Comp and ConFM do not de energize CM is defective and must be replaced 26
14. in its correct position 9 Plug the unit back in Move the power switch to the ON position 10 The spindle on the control module controls the setpoint until the display module is activated To activate the display module press the upper button on the display module to view the current setpoint Failure to activate the display module may result in unexpected cabinet temperatures Note If three dashes appear on the display module when energized the compressor and display module are off To turn the compressor and display module on press and hold the upper and lower buttons until the temperature appears on the display CAUTION The three dashes must be cleared otherwise the compressor will not run and product will be lost i 1 un i Maus d Am 1 m Y AM Control Module Control Box Fig 7 CAUTION The three dashes must be cleared x otherwise the compressor will not run and product will be lost To turn the compressor and display module on press and hold the upper and lower buttons until the temperature appears on the display 42 Removal and Replacement of Thermistors This section covers removal and replacement of the cabinet and defrost thermistors For a thermistor check procedure see IV C Thermistor Check CAUTION 1 The thermistors are fragile handle very carefully 2 Do not shorten or cut the thermistor leads 1 Cabinet Thermisto
15. overload start components and Comp and ConFM motor windings Check Comp and ConFM motor winding continuity 2 minute temperature delay timer terminates temperature display appears on DM 10 MH and PH Diagnosis Check that MH and PH energize Check for 115VAC at MH and PH If 115VAC is not present check power supply and continuity of power switch If 115VAC is present check amp draw of MH or PH If an amp reading is not present check the continuity of MH or PH Legend CM control module Comp compressor ConFM condenser fan motor CTh cabinet thermistor DM display module DS door switch DSR door switch relay DTh defrost thermistor EvapFM evaporator fan motor HPS high pressure switch MH mullion heater PH perimeter heater 2 Freezer 7 Startup Cool Down MH and PH energize There is a slight delay then Comp ConFM and EvapFM energize and cabinet temperature appears on DM Once DTh reaches 32 F 0 C 4 hour Comp cumulative run timer starts a Startup Diagnosis Check that EvapFM energizes If not confirm that the door s are closed and DS contacts are closed Check EvapFM blade for binding Next check for 115VAC at DSR terminals 7 white W and 8 light blue LBU If 115VAC is not present check DS continuity If 115VAC is present check DSR coil continuity and contact continuity between terminals 6 white W and 3 dark blue DBU If coil or contacts are open DSR is bad and must be replaced Next check for 115VAC b
16. the drier from overheating Do not allow the drier to exceed 250 F 121 C 1 Move the power switch to the OFF position then unplug the unit 2 Remove the condenser shroud 3 Recover the refrigerant and store it in an approved container See V A Service for Refrigerant Lines 4 5 6 7 Disconnect the condenser tubing then remove the condenser Place the new condenser in position Remove the drier then place the new drier in position SG Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG See V A 2 Brazing 8 Use an electronic leak detector or soap bubbles to check for leaks Add a trace of refrigerant to the system if using an electronic leak detector and then raise the pressure using nitrogen gas 140 PSIG DO NOT use R 404A or R 134a as a mixture with pressurized air for leak testing 9 Evacuate the system and charge it with refrigerant See V A 3 Evacuation and Recharge See the nameplate for the required refrigerant and refrigerant charge 10 Replace the condenser shroud in its correct position WARNING To reduce the risk of electric shock confirm that the condenser fan motor ground wire is properly connected 11 Plug the unit back in Move the power switch to the ON position 39 E Removal and Replacement of Expansion Valve 2 Section Freezer Moisture in the refrigeration circuit may exceed drier capacity and freeze up at the expansion va
17. 0 M E 180 m NM m 4002 40102 391 83136 ETEEN J d l 12406 341553 44 D 4 4 gt a Q9 50 e o B q B y E Vio 7 oo d 1 m X RUNS ATEM HOSS2UHO fake 31980 Av IGS TE Nc x eE y 4 r aj pums 83004 Mos D 3j Indow VI l a 101 0 ro A E bo AZ INY 8 tto el bi Tn 009 ges 72 mizi 8 m ISH 00 1 x E 37000 AV 14810 N D M n 22 IV Service Diagnosis A WARNING 1 This unit should be diagnosed and repaired only by qualified service personnel to reduce the risk of death electric shock serious injury or fire 2 Risk of electric shock Use extreme caution and exercise safe electrical practices 3 Moving parts e g fan blade can crush and cut Keep hands clear 4 Make sure all food zones are clean after the unit is serviced For cleaning procedures see VI Cleaning Instructions A Diagnostic Procedure 1 2 3 4 5 6 wae o sr A WARNING The evaporator fan motor and cabinet light have a constant 115VAC supplied to them These 2 components switch on and off through the operation of the door switch relay When the door switch relay de energizes door open relay contact terminals 6 white W and 2 violet V close to complete the neutral wire white
18. 15VAC is not present check power supply and power switch 4 Check that the display module is on and cabinet temperature is displayed If not it is recommended that both the control module and display module be replaced 5 Freezer Check that the evaporator fan motor is energized Make sure that the door s are closed and the door switch is engaged Next check for 115VAC between control module terminals F6 and N5 If 115VAC is not present control module must be replaced 6 Check that the compressor and condenser fan motor energize If not check for 115VAC between control module terminals C1 and N5 If 115VAC is not present control module must be replaced Defrost 7 Press and hold the lower button until dEF appears on the display module 8 Confirm that the compressor condenser fan motor and evaporator fan motor freezer de energize Check for 115VAC between control module terminals C1 and N5 for compressor and condenser fan motor then between terminals F6 and N5 freezer for evaporator fan motor If dEF is displayed and the compressor condenser fan motor or evaporator fan motor freezer are on control module must be replaced 9 Freezer Confirm that the defrost heater energizes Check for 115VAC between control module terminals H4 and N5 If dEF is displayed and 115VAC is not present control module must be replaced 28 10 Check that the components restart after defrost termination Refrigerator Compressor and
19. CM is bad and must be replaced If 115VAC is present between CM C1 and CM N5 check continuity of HPS 2 section If open allow time for HPS to reset If HPS does not reset replace HPS and diagnose reason for HPS activation See IV A 1 7 c HPS Activation 2 section Check for 115VAC at Comp terminals Comp external overload start components and Comp and ConFM motor windings Check Comp and ConFM motor winding continuity If Comp and ConFM are energized and the cabinet does not cool down check for a restriction in the refrigeration circuit and correct refrigerant charge C HPS Activation 2 section Confirm ConFM is energized and fan blade turns freely Check that the condenser coil is not clogged or restricted Check that there are no restrictions in the refrigeration circuit drier Confirm that the location meets factory requirements This unit is not intended for outdoor use Normal operating ambient temperature should be within 45 F to 100 F 7 C to 38 C The unit should not be located next to ovens grills or other high heat producing equipment The unit should not be located in a corrosive environment The unit should be a minimum of 4 11 cm from side walls A minimum of 10 25 cm overhead clearance should be provided for proper ventilation 8 Cool Down Achieved CTh cools to 3 F 1 7 C below setpoint EvapFM MH and PH continue Comp and ConFM de energize Diagnosis If Comp and ConFM do not de en
20. Hoshizaki America Inc Commercial Series Refrigerated Kitchen Equipment Model Reach In SERVICE MANUAL A Superior Degree of Reliability www hoshizaki com Number 73179 Issued 6 18 2010 IMPORTANT Only qualified service technicians should install service and maintain the unit No service or maintenance should be undertaken until the technician has thoroughly read this Service Manual Failure to service and maintain the equipment in accordance with this manual may adversely affect safety performance component life and warranty coverage Hoshizaki provides this manual primarily to assist qualified service technicians in the service and maintenance of the unit Should the reader have any questions or concerns which have not been satisfactorily addressed please call write or send an e mail message to the Hoshizaki Technical Support Department for assistance HOSHIZAKI AMERICA INC 618 Highway 74 South Peachtree City GA 30269 Attn Hoshizaki Technical Support Department Phone 1 800 233 1940 Technical Support 770 487 2331 Fax 1 800 843 1056 770 487 3360 E mail techsupport 9 hoshizaki com Web Site www hoshizaki com NOTE To expedite assistance all correspondence communication MUST include the following information Model Number Serial Number Complete and detailed explanation of the problem IMPORTANT This manual should be read carefully before the unit
21. Th status See IV C Thermistor Check If DTh is not in proper range confirm DH amp draw and continuity If DTh is in proper range DH de energizes and 3 delay timers start 3 minute Comp delay timer terminates Have Comp and ConFM energized after DH is de energized for 3 minutes If not check for 115VAC between CM C1 and CM N5 If 115VAC is not present CM is defective and must be replaced If 115VAC is present between CM C1 and CM N5 check for 115VAC on CR coil terminals 5 and 6 If 115VAC is not present between CR 5 and CR 6 check continuity of HPS If open allow time for HPS to reset If HPS does not reset replace HPS and diagnose reason for HPS activation See IV A 2 7 c HPS Activation If 115VAC is present between CR 5 and CR 6 and Comp and ConFM do not energize check CR contact continuity If open CR is defective and must be replaced If CR is good and Comp or ConFM do not energize check for 115VAC at Comp terminals check Comp overload internal on 1 section start components and Comp and ConFM motor windings Check Comp and ConFM motor winding continuity 8 minute EvapFM delay timer terminates 3 minutes on manually initiated defrost Confirm EvapFM energizes 5 minutes after Comp and ConFM energize 13 minute temperature display delay timer terminates Confirm cabinet temperature appears on DM 5 minutes after EvapFM energizes If components fail to start after delay timer terminates CM is defective and must be replac
22. a 29 9 Hg vacuum Evacuating period depends on pump capacity 4 Close the low side valve and high side valve on the gauge manifold 34 5 Disconnect the gauge manifold hose from the vacuum pump and attach it to a refrigerant service cylinder Remember to loosen the connection and purge the air from the hose See the nameplate for the required refrigerant charge Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets ARI Standard 700 latest edition be used 6 A liquid charge is required when charging an R 404A system to prevent fractionation and optional when charging an R 134a system Place the service cylinder on the scales if the service cylinder is not equipped with a dip tube invert the service cylinder then place it on the scales Open the high side valve on the gauge manifold 7 Allow the system to charge with liquid until the proper charge weight is met 8 If necessary add any remaining charge to the system through the low side CAUTION To prevent compressor damage use a throttling valve or liquid dispensing device to add the remaining liquid charge through the low side access port with the unit running 9 Close gauge manifold valves and disconnect the hoses 10 Cap the access valves to prevent a possible leak Refrigeration Circuit Access Valve Condenser Fan Motor Access Valve Condenser Compressor Condensate Pump Control Box N Air Filter
23. ak detector and then raise the pressure using nitrogen gas 140PSIG DO NOT use R 134a or R 404A as a mixture with pressurized air for leak testing 1 Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG CAUTION 1 Always install a new drier every time the sealed refrigeration system is opened 2 Do not replace the drier until after all other repair or replacement has been made Install the new drier with the arrow on the drier in the direction of the refrigerant flow 3 When brazing protect the drier by using a wet cloth to prevent the drier from overheating Do not allow the drier to exceed 250 F 121 C 2 Use an electronic leak detector or soap bubbles to check for leaks Add a trace of refrigerant to the system if using an electronic leak detector and then raise the pressure using nitrogen gas 140 PSIG DO NOT use R 134a or R 404A as a mixture with pressurized air for leak testing 3 Evacuation and Recharge 1 Attach a vacuum pump to the system Be sure the charging hoses are connected to both high and low side access valves IMPORTANT The vacuum level and vacuum pump may be the same as those for current refrigerants However the rubber hose and gauge manifold to be used for evacuation and refrigerant charge should be exclusively for POE oils 2 Turn on the vacuum pump Never allow the oil in the vacuum pump to flow backwards 3 Allow the vacuum pump to pull down to
24. cabinet interior should be cleaned periodically with a mild soap or detergent Door Gaskets Door gaskets should be cleaned regularly with mild soap and water to remove dirt and grease Air Filter Check the filter at least once a month If it is dirty use warm water and a neutral cleaner to wash the filter Condenser Check the condenser once a year and use a brush or vacuum cleaner to clean the unit as required 46
25. e 1 Control Module Layout Refrigerator Control Module To Display Module A Display Cable Defrost Thermistor Cabinet Thermistor N5 Neutral white L3 Power Switch black C1 Compressor red Fig 2 Freezer Control Module To Display Module UN Display Cable Defrost Thermistor Cabinet Thermistor 4 2 3 4 Ou TI A em F6 Evaporator Fan Motor black N5 Neutral white H4 defrost heater black L3 Power Switch black C1 Compressor red 2 Alarm Safeties Alarm signals are designed to protect the unit and food product These alarms give information or warnings in the event the unit is operating out of acceptable parameters Should one of the alarms occur follow the instructions in the table below to address the alarm The alarm code flashes once every second with audible alarm Alarm Signals Alarm Code Corrective Action Reset Details Cabinet Thermistor Malfunction Alarm Cabinet thermistor disconnected shorted or open Check connection and continuity Reconnect or Cabinet thermistor has failed replace as needed E1 flashes with audible alarm every second Unit cycles 5 min on 5 min off Defrost Thermistor Malfunction Alarm Defrost thermistor disconnected shorted or open Check con
26. e right to make changes in specifications and design without prior notice 2 One Section Two Section mm in Un FS e 1 lt Ly s s 1H0 HEI 0 ect EA m m ES 1 Ji oc ez e Ex D a 2 ae oo gt om oo Ec e Sin c a a o9 Lip I Il General Information A Construction 1 One Section Compressor Condensate Pump Control Box 4 Control Box Condenser Fan Motor Condenser Air Filter Povver Cord aa Front Panel s Door Switch Float Switch Control Module Door i Power Switch T Display Module Float Reservoir Switch Door Lock Bracket Reservoir Light pe T o Evaporator Cabinet Thermistor Defrost Thermistor Evaporator Fan Shroud Door Gasket Model Shown CR1A FS CR1A FS HS and CF1A FS HS 8 2 Two Section Thermostatic Expansion Valve CF2A FS HS Compressor 4 4
27. e thermistor in question See V I Removal and Replacement of Thermistors 4 Immerse the thermistor sensor portion in a glass containing ice and water for 2 to 3 minutes 5 Check the resistance between the wires at the thermistor connector Normal reading is within 16 0 to 16 7 kO If outside the normal reading replace the thermistor 6 Reconnect and replace the thermistor in its correct position See V I Removal Replacement of Thermistors 7 Plug the unit back in Move the power switch to the ON position 29 D Diagnostic Chart 1 Unit Not Cooling Possible Cause 1 Unit does not a Power Supply 1 Unplugged off blown fuse 1 Plug in turn on replace or reset start or tripped or defective circuit breaker c Power Switch control box 1 OFF position 1 Move to ON position 1 Loose connection or open 1 Tighten check for continuity and repair 2 Faulty 2 Check for continuity and replace e Control Module 1 In alarm or displayed 1 See II D 2 Alarm Safeties 2 Defective 2 See IV B Control Module Check 2 Evaporator fan Door Switch 1 Check for continuity and replace does not start b Door Switch Relay 1 Power supply not within 1 Refer to nameplate and correct specifications 2 Check for continuity and replace 3 Open coil windings 3 Replace c Control Module freezer 1 See IV B Control Module Check d Evaporator Fan Motor 3 Cool d
28. ed 27 10 MH and PH Diagnosis Check that MH and PH energize Check for 115VAC at MH and PH If 115VAC is not present check power supply and continuity of power switch If 115VAC is present check amp draw of MH or PH If an amp reading is not present check the continuity of MH or PH Legend Comp compressor ConFM condenser fan motor CM control module CTh cabinet thermistor CR compressor relay DH defrost heater DM display module DSR door switch relay DTh defrost thermistor EvapFM evaporator fan motor HPS high pressure switch MH mullion heater PH perimeter heater TXV thermostatic expansion valve B Control Module Check Before replacing a control module that does not show a visible defect and that you suspect is bad always conduct the following check procedure This procedure will help you verify your diagnosis Always choose a white W neutral wire to establish a good neutral connection when checking high voltages Also confirm that there is a good neutral connection to the control module terminal N5 Alarm Reset To silence the alarm press and release the upper or lower button with power on For alarm information see II D 2 Alarm Safeties Startup Cool Down 1 Check all wiring connections Confirm that the display module cable cabinet thermistor and defrost thermistor are properly connected 2 Move the power switch to the ON position 3 Check for 115VAC between control module terminals L3 and N5 If 1
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30. eplacing or servicing parts The Polyol Ester POE oils used in R 134a and R 404A units can absorb moisture quickly Therefore it is important to prevent moisture from entering the system when replacing or servicing parts Always install a new drier every time the sealed refrigeration system is opened Do not replace the drier until after all other repair or replacement has been made Install the new drier with the arrow on the drier in the direction of the refrigerant flow When brazing protect the drier by using a wet cloth to prevent the drier from overheating Do not allow the drier to exceed 250 F 121 C 1 Refrigerant Recovery The unit is provided with refrigerant access valves Using proper refrigerant practices recover the refrigerant from the access valves and store it in an approved container Do not discharge the refrigerant into the atmosphere 33 2 Brazing A WARNING 1 R 134a and R 404A themselves are not flammable at atmospheric pressure and temperatures up to 176 F 80 C 2 R 134a and R 404A themselves are not explosive or poisonous However when exposed to high temperatures open flames R 134a and R 404A can be decomposed to form hydrofluoric acid and carbonyl fluoride both of which are hazardous Do not use silver alloy or copper alloy containing arsenic Use an electronic leak detector or soap bubbles to check for leaks Add a trace of refrigerant to the system if using an electronic le
31. ergize confirm CTh status See IV C Thermistor Check If CTh ohm reading is in range and Comp and ConFM do not de energize CM is defective and must be replaced 24 9 Defrost Temperature Initiated Defrost DTh cools to 8 6 F 13 C EvapFM MH and PH continue Comp and ConFM de energize Defrost Termination DTh warms to 40 F 4 4 C EvapFM MH and PH continue Comp and ConFM energize 2 minute temperature display delay timer starts 2 minutes later cabinet temperature appears on DM Defrost Diagnosis Defrost Initiation Has DTh cooled to 8 6 F 13 C or lower Confirm DTh status See IV C Thermistor Check If DTh is in proper range confirm that Comp and ConFM de energize If not check for 115VAC between CM C1 and CM N5 If 115VAC is present and DTh is within proper range CM is defective and must be replaced Defrost Termination Has DTh warmed to 40 F 4 4 C If not yet confirmed confirm DTh status See IV C Thermistor Check If DTh is in proper range has Comp and ConFM energized If not check for 115VAC between CM C1 and CM N5 If 115VAC is not present CM is defective and must be replaced If 115VAC is present between CM C1 and CM N5 on 2 section refrigerator check continuity of HPS If open allow time for HPS to reset If HPS does not reset replace HPS and diagnose reason for HPS activation See IV A 1 7 c HPS Activation 2 section On all models check for 115VAC at Comp terminals Comp external
32. etween CM F6 and CM If 115VAC is not present check between CM L3 and N5 If 115VAC is present between CM L3 and CM N5 and not between CM F6 and CM N5 CM is defective and must be replaced If 115VAC is present between CM F6 and CM N5 check EvapFM continuity 25 b Cool Down Diagnosis Confirm that Comp and ConFM energize and cabinet temperature appears on DM If not confirm 115VAC between CM L3 and CM N5 If 115VAC is not present confirm wiring connections are secure for both the power wire CM L3 and the neutral wire CM N5 If 115VAC is present and DM is off check that the display cable between CM and DM is not disconnected reconnect if loose If DM is still off CM or DM may be bad so replace both Next check that Comp and ConFM are energized If not check for 115VAC between CM C1 and If 115VAC is present between CM L3 and CM N5 above and not between CM C1 and CM N5 check CTh status See IV C Thermistor Check If CTh ohm reading is in proper range CM is bad and must be replaced If 115VAC is present between CM C1 and CM N5 check for 115VAC on CR coil terminals 5 and 6 If 115VAC is not present between CR 5 and CR 6 check continuity of HPS If open allow time for HPS to reset If HPS does not reset replace HPS and diagnose reason for HPS activation See IV A 2 7 c HPS Activation If 115VAC is present between CR 5 and CR 6 and Comp and ConFM are not energized check CR contact continuity If open CR is
33. eved CM monitors cooling of the cabinet via CTh CTh cools to 3 F 1 7 C below setpoint EvapFM MH and PH continue Comp and ConFM de energize 3 Cool Down Restart CTh warms to 3 F 1 7 C above setpoint EvapFM MH and PH continue Comp and ConFM energize 4 Defrost dEF is displayed during defrost There is a 20 minute minimum defrost time and a 1 hour maximum defrost time a Temperature Initiation When DTh cools to 8 6 F 13 C defrost begins EvapFM MH and PH continue Comp and ConFM de energize b Manual Initiation Manual defrost may be initiated by pressing and holding the lower button until dEF appears on DM EvapFM MH and PH continue Comp and ConFM de energize Termination DTh warms to 40 F 4 4 C EvapFM MH and PH continue Comp and ConFM energize 2 minute temperature display delay timer starts 2 minute temperature display delay timer terminates and temperature display returns to DM Note There is a 2 hour minimum defrost interval Legend CM control module Comp compressor ConFM condenser fan motor CTh cabinet thermistor DM display module DTh defrost thermistor EvapFM evaporator fan motor MH mullion heater PH perimeter heater b Freezer 1 Startup Cool Down MH and PH energize There is a slight delay before cabinet temperature appears on DM and Comp ConFM and EvapFM energize 2 Cool Down Achieved CM monitors cooling of the cabinet via CTh CTh cools to 3 F 1 7 C be
34. ground prong from the power cord and do not use an adapter plug Do not use an extension cord Make sure the power switch is in the OFF position before plugging in or unplugging the unit to reduce the risk of electric shock Do not use a unit with a damaged power cord The power cord should not be altered jerked bundled weighed down pinched or tangled Such actions could result in electric shock or fire To unplug the unit be sure to pull the plug not the cord and do not jerk the cord To reduce the risk of electric shock do not touch the plug or power switch with damp hands This unit should be disassembled or repaired only by qualified service personnel to reduce the risk of electric shock injury or fire Do not make any alterations to the unit Alterations could result in electric shock injury fire or damage to the unit 1 Specifications A Nameplate Ratings Design Pressure AC Supply PSIG Refrigerant oz Voltage Amperes miem Low 84044 240 m 450 200 CR2A FS HS 240 120 CF2A FS HS 250 See the nameplate for electrical and refrigeration specifications The nameplate is located on the inner right side wall of the cabinet behind the front panel Note We reserve the right to make changes in specifications and design without prior notice B Dimensions 1 Refrigerated Volume and Shelf Space Total Refrigerated Total Shelf Space Volume ft ft Note We reserve th
35. is serviced or maintenance operations are performed Only qualified service technicians should install service and maintain the unit Read the warnings contained in this booklet carefully as they give important information regarding safety Please retain this booklet for any further reference that may be necessary CONTENTS Important Safety Information srl 5 L DEC CAORS Qo enn 6 A Ele 21245 1211 s 6 B DIMENSIONS euo oi ada db A 6 1 Refrigerated Volume and Shelf 6 2 One Section Two SOM eM a R Wanna 7 ll General MOTI AMON ro 8 A A ss 8 e 2 8 2 Iwo S ECHO a d 9 B Sequence of ODM a NRI TE 10 1 Sequence Cycles and Shutdown ccccccccnonnccccncccnnnonccconcnnnnnnnnnnoncnnnnnnnnncnnnnnnnnnnanccnnos 10 GE LULU b a Oo S D 10 0155007 im 11 2 Sequence Flow Charts aa b a ad 12 a Refrigerator PN a a aa assa 12 055020 13 Us Display HORUE aaa a a 14 1 Display Module Il r m an 14 2 Controls and AUIUSIITIGRS usina 15 D Control Modules E aida dal dak 16 1 Control Module Layos 16 2 Alarmi AAPP A 17 F Compressor Overload and Short Cycle Protection 18 G M llion Perim ter nac 18 Thetmisiofe ccm 18 IL Technical Data aa 19 A Wiring L nr risa cells 19 IV Service n a radar 23 A Diagnostic
36. low setpoint EvapFM MH and PH continue Comp and ConFM de energize 3 Cool Down Restart CTh warms to 2 F 1 1 C above setpoint EvapFM MH and PH continue Comp and ConFM energize 4 Defrost dEF is displayed during defrost There is a 5 minute minimum defrost time and a 1 hour maximum defrost time a Temperature Time Initiation DTh 00016 to 32 F 0 C then a 4 hour cumulative Comp run timer starts Once 4 hour cumulative Comp run timer terminates and DTh is at or below 32 F 0 C defrost begins DH energizes MH and PH continue Comp ConFM and EvapFM de energize b Manual Initiation Manual defrost may be initiated by pressing and holding the lower button until dEF appears on DM MH and PH continue DH energizes Comp ConFM and EvapFM de energize C Termination 1 After Temperature Time Initiation DTh warms to 59 F 15 C 3 minute Comp delay timer starts 8 minute EvapFM delay timer starts and 13 minute temperature display delay timer starts MH and PH continue DH de energizes 3 minute Comp delay timer terminates Comp and ConFM energize 5 minutes later 8 minute EvapFM delay timer terminates and EvapFM energizes 5 minutes after EvapFM energizes 13 minute temperature display delay timer terminates and cabinet temperature returns to DM 2 After Manual Initiation DTh warms to 59 F 15 C MH and PH continue DH de energizes 3 minute Comp EvapFM delay timer starts 13 minute temperature display dela
37. lve CAUTION 1 Always install a new drier every time the sealed refrigeration system is opened 2 Do not replace the drier until after all other repair or replacement has been made Install the new drier with the arrow on the drier in the direction of the refrigerant flow 3 When brazing protect the valve body and drier by using wet cloths to prevent the valve body and drier from overheating Do not allow the valve body or drier to exceed 250 F 121 C 1 Move the power switch to the OFF position then unplug the unit 2 Recover the refrigerant and store it in an approved container See V A Service for Refrigerant Lines 3 Remove the insulation and the expansion valve bulb on the suction line 4 Remove the expansion valve cover and disconnect the expansion valve Place the new expansion valve in position 5 Remove the drier then place the new drier in position 6 Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG See V A 2 Brazing 7 Use an electronic leak detector or soap bubbles to check for leaks Add a trace of refrigerant to the system if using an electronic leak detector and then raise the pressure using nitrogen gas 140 PSIG DO NOT use R 404A as a mixture with pressurized air for leak testing 8 Evacuate the system and charge it with refrigerant See V A 3 Evacuation and Recharge See the nameplate for the required refrigerant and refrigerant charge
38. n freezer compressor is protected by an internal compressor overload and a high pressure switch The 2 section freezer is protected by an external compressor overload and a high pressure switch When the compressor temperature or amperage value is above the limit specified by the compressor manufacturer the compressor overload activates turning off the compressor The compressor restarts when the overload resets When the refrigerant pressures exceed the high pressure switch value the compressor relay is de energized turning off the compressor The compressor restarts when the high pressure switch resets and energizes the compressor relay e f the condenser fan motor is operating and the compressor is off it is most likely that the compressor overload opened If both the compressor and condenser fan motor are off it is most likely the unit is off or the high pressure switch has opened For further details see IV Service Diagnosis 2 Short Cycle Protection There is a 2 minute minimum compressor off timer for any restart after 1 minute of compressor run time There is also a 2 minute minimum compressor on timer Note Time may vary with high pressure switch or compressor overload activation G Mullion Perimeter Heater Some models are equipped with perimeter and or mullion heaters The heaters are energized as soon as the power switch is turned on H Thermistors The cabinet thermistor is used for cabinet temperature control and the defr
39. ndenser 1 Increase ventilation or lower but temperature restricted or ambient ambient temperature does not drop temperature too high b Cabinet Temperature too 1 1 Warm food recently placed in 1 Pre cool food product or allow High cabinet area time for unit to return to normal setpoint temperature 2 Air flow blocked 2 Remove blockage or redistribute food products C Setpoint 1 Incorrect 1 Correct setpoint See II C 2 a Default Settings 1 Left open or opened too 1 Close Check for door open often at time of warm cabinet temperature 2 Not sealing 2 Check for proper sealing Replace gasket 6 Clogged Filter Condenser 1 Clogged filter or condenser 1 Clean filter and condenser coil coil 1 Clogged or frozen 1 Clean Defrost and check defrost cycle 9 Evaporator Fan Motor 2 Dot witch defective 2 Crook jor continuity and replace 3 Door switch relay defective 3 See chart 1 2 b Door Switch Relay h Control Module 1 Defective 1 See IV B Control Module Check i Refrigerant Refrigerant 1 Gas leaks 1 Check for leaks with a leak Lines detector Recover refrigerant and repair leaks Replace drier evacuate and recharge See V A Service for Refrigerant Lines 2 Refrigerant lines restricted 2 Recover repair replace drier evacuate and recharge See V A Service for Refrigerant Lines j Compressor 1 Replace 5 Cool down a Control Module 1 Defective 1 See IV B Co
40. nection and continuity Reconnect or Defrost thermistor has failed replace as needed E2 flashes with audible alarm every second Unit cycles on and off with cabinet thermistor The compressor de energizes if voltage protection operates The voltage safeties automatically reset Low Voltage Alarm 96VAC 5 or less When voltage 18 corned Communication Error Alarm Check the connections at the control module and the display module If connections are good Communication between the control the control module and display module must be module and the display module has been replaced interrupted or disconnected The unit operates on a set 5 minutes on 5 minutes off cycle until communication is restored Compressor Off Unit compressor off Press and hold the upper and lower buttons until the temperature appears on the display 17 F Compressor Overload and Short Cycle Protection 1 Compressor Overload a Refrigerator The refrigerator compressor is protected by an external compressor overload and a high pressure switch 2 section When the compressor temperature or amperage value is above the limit specified by the compressor manufacturer the external compressor overload activates turning off the compressor The compressor restarts when the external overload resets e f the condenser fan motor is operating and the compressor is off it is most likely that the external compressor overload opened b Freezer The 1 sectio
41. nformation Throughout this manual notices appear to bring your attention to situations which could result in death serious injury or damage to the unit A WARNING Indicates a hazardous situation which could result in death or serious injury CAUTION Indicates a situation which could result in damage to the unit IMPORTANT Indicates important information about the use and care of the unit A WARNING This unit should be destined only to the use for which it has been expressly conceived Any other use should be considered improper and therefore dangerous The manufacturer cannot be held responsible for eventual damage caused by improper incorrect and unreasonable use To reduce the risk of death electric shock serious injury or fire follow basic precautions including the following This unit requires an independent power supply See the nameplate for proper voltage and breaker fuse size Failure to use a proper breaker or fuse can result in a tripped breaker blown fuse or damage to existing wiring This could lead to heat generation or fire THIS UNIT MUST BE GROUNDED This unit is equipped with a 3 prong grounding plug to reduce the risk of potential shock hazards It must be plugged into a properly grounded independent 3 prong wall outlet If the outlet is a 2 prong outlet it is your personal responsibility to have a qualified electrician replace it with a properly grounded independent 3 prong wall outlet Do not remove the
42. ntrol Module achieved Check compressor continues 31 2 Evaporator is Frozen Up Possible Cause 1 Evaporator does 1 Reposition or replace See IV C not defrost Thermistor Check complere d Defrost Thermostat Open 1 Defective 1 Replace freezer 2 Compressor on a Control Module 1 Defective during defrost 3 Evaporator fan a Control Module 1 Defective 1 See IV B Control Module Check on freezer 3 Defrost Fails to Terminate Possible Cause 1 Defrost cycle a Defrost Thermistor 1 Out of position or defective 1 Reposition or replace See IV C too long Thermistor Check b Control Module 1 Defective 1 See IV B Control Module Check 4 Other Possible Cause 1 Condensate a Power Supply 1 Loose wire or connection 1 Correct or replace loose wire or pump not connection operating b Float Switch 1 Sticking 1 Clean check continuity Replace 1 Replace d Tubing 1 Restricted or defective 1 Clean or replace 2 Abnormal Noise a Fasteners 1 Loose fasteners allow 1 Tighten fasteners vibration of part b Compressor 1 Problem with mount 1 Properly mount compressor Replace any missing grommets 2 Floodback to compressor 2 Check for signs of floodback to compressor Evacuate and recharge if necessary Fan evaporator or condenser 3 Condensate 8 Cabinet Contents 1 Loading of large volumes 1 Allow product to cool before water overflow of wa
43. ost thermistor is used for defrost cycle initiation and termination Thermistor resistance varies depending on temperature The control module monitors the resistance to control system operation No adjustment is required For further details see IV C Thermistor Check 18 Ill Technical Data A Wiring Diagrams 1 CR1A FS HS HOIMS 1401 E NOILISOd Nadi NI 8000 AV TSU HD IMS 8000 Ny 1 did ne 31V5N40N02 M m ii N4430 89 2000 T 3118 Ng m amp T 06 4018 LHOI Ng Uy w V D MOTTA 4 O i IIIA A impara 91300 3018 4 0 nad x ld d 5 MUD D i J NYY0 0 INYO 038 y 14000 ZW n AUAM 824 NOVTINH TVINOZINOH wig yg ao jLIHM M m e va NMOS 88 4002 4010 HM m 22 e y 4 eh x P Mg Lv Ms IKAD 901 3180 SO 03 087 a lo T E 2 oal nao A Y HDLIAS 49004 OSN T041N02 rt 003 to 13080 Et M 9 9 1 7 1109 SH 3 70004 AV 1dS10 19 2 CR2A FS HS BOS 1703 NE eli NOLLISOd 4300 N 98000 AVTSY HOLMS 8000
44. own a Setpoint 1 UZU 1 Coren eon See II C 2 a does not start Default Settings compressor b Control Module 1 In alarm or displayed 1 See II D 2 Alarm Safeties 2 Defective 2 See IV B Control Module Check c High Pressure Svvitch 1 Bad contacts 1 Check for continuity and replace 2 Dirty air filter or condenser 3 Ambient temperature too 3 Reduce temperature warm 4 Refrigerant overcharge 4 Recharge See V A Service for Refrigerant Lines 5 Condenser fan not operating 5 Replace 6 Refrigerant lines or 6 Recover repair replace drier components restricted evacuate and recharge See V A Service for Refrigerant Lines d Compressor Relay 1 Replace freezer 2 Open coil windings 2 Replace 30 Possible Cause 3 Cool down e Refrigerators and 1 Defective 1 Let compressor cool and allow does not start 2 Section Freezer overload to reset compressor External Compressor If overload does not reset continued Overload Refrigerator replace the 1 Section Freezer overload Internal Compressor Freezer replace the Overload compressor Once the overload resets check compressor amperage and operating voltage 2 Open due to clogged filter or 2 Clean filter and condenser coil condenser coil 3 Open due to condenser fan 13 Replace condenser fan not operating f Compressor 1 Replace 4 Cool down starts a Location of Unit 1 Air flow to co
45. r 1 Move the power switch to the OFF position then unplug the unit 2 Remove the evaporator fan shroud Remove the cabinet thermistor from the evaporator fan shroud 3 Remove the control box cover 4 Disconnect the cabinet thermistor from the control module then remove the cabinet thermistor 5 6 7 8 Route the new cabinet thermistor from the control box to the evaporator fan shroud Secure the cabinet thermistor to the evaporator fan shroud Replace the evaporator fan shroud in its correct position Connect the cabinet thermistor to the control module then replace the control box cover in its correct position 9 Plug the unit back in Move the power switch to the ON position HOSHIZAKI COMMERCIAL SERIES Refrigerator Cabinet Thermistor located on the inside of the evaporator fan shroud Freezer Cabinet Thermistor located on the outside of the evaporator fan shroud Evaporator Fan Shroud 2 Defrost Thermistor 1 Move the power switch to the OFF position then unplug the unit 2 Remove the evaporator fan shroud Remove the cabinet
46. r switch to the OFF position then unplug the unit 2 Recover the refrigerant and store it in an approved container See V A Service for Refrigerant Lines 3 Remove the evaporator fan shroud Remove the cabinet thermistor from the evaporator fan shroud 4 Note the location of the defrost thermistor then remove the defrost thermistor 5 Disconnect the evaporator fan motor ground wire then remove the evaporator shroud and evaporator drain bracket 6 On freezers remove the defrost heater 7 Remove the 4 refrigeration circuit mounting screws and lift the refrigeration circuit to access the evaporator refrigeration connections 8 9 10 11 12 13 Remove the insulation then disconnect the evaporator tubing Remove the front 2 evaporator mounting screws and slide the evaporator out Remove the evaporator brackets and secure them to the new evaporator _ Place the new evaporator into the evaporator mounting brackets and secure Remove the drier then place the new drier in position Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG See V A 2 Brazing 14 Use an electronic leak detector or soap bubbles to check for leaks Add a trace of refrigerant to the system if using an electronic leak detector and then raise the pressure using nitrogen gas 140 PSIG DO NOT use R 404A or R 134a as a mixture with pressurized air for leak testing 15 Lowe
47. r the refrigeration circuit and secure with the 4 mounting screws 16 Evacuate the system and charge it with refrigerant See V A 3 Evacuation and Recharge See the nameplate for the required refrigerant and refrigerant charge 17 Replace the removed parts in the reverse order of which they were removed Confirm the location of the defrost thermistor WARNING To reduce the risk of electric shock be sure to reconnect the evaporator fan motor ground wire On freezers make sure the defrost thermistor wire is not touching the defrost heater 18 Plug the unit back in Move the power switch to the ON position 37 Evaporator Replacement c Refrigeration Circuit Mounting Screw Refrigeration Circuit z Evaporator Mounting Mounting Screw Bracket Evaporator Brackets Evaporator Mounting Bracket Freezer Defrost Thermistor Location Evaporator Evaporator Drain Bracket Freezer Defrost Refrigerator Defrost Heater Thermistor Clip and Tie Evaporator Fan Shroud 38 D Removal and Replacement of Condenser CAUTION 1 Always install a new drier every time the sealed refrigeration system is opened 2 Do not replace the drier until after all other repair or replacement has been made Install the new drier with the arrow on the drier in the direction of the refrigerant flow 3 When brazing protect the drier by using a wet cloth to prevent
48. rm moist uncovered placing in cabinet Cover product product with plastic wrap b Location of Unit 1 Unit located near high 1 Relocate humidity source such as fryer steamer etc C Seals 1 Poor sealing around 1 Adjust or replace evaporator door gaskets d Environment 1 Extreme environment and 1 Adjust conditions door opening conditions e Condensate Pump 1 Not operating 1 See chart 4 1 Condensate pump not operating 32 V Removal and Replacement of Components A WARNING 1 This unit should be diagnosed and repaired only by qualified service personnel to reduce the risk of death electric shock serious injury or fire 2 Move the power switch to the OFF position then unplug the unit from the electrical outlet before servicing A Service for Refrigerant Lines A WARNING Repairs requiring the refrigeration circuit to be opened must be performed by properly trained and EPA certified service personnel Always recover the refrigerant and store it in an approved container Do not discharge the refrigerant into the atmosphere Use an electronic leak detector or soap bubbles to check for leaks Add a trace of refrigerant to the system if using an electronic leak detector and then raise the pressure using nitrogen gas 140 PSIG DO NOT use R 134a or R 404A as a mixture with pressurized air for leak testing CAUTION Do not leave the system open for longer than 15 minutes when r
49. rom the suction discharge and process pipes 11 Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG See V A 2 Brazing 12 Use an electronic leak detector or soap bubbles to check for leaks Add a trace of refrigerant to the system if using an electronic leak detector and then raise the pressure using nitrogen gas 140 PSIG DO NOT use R 134a or R 404A as a mixture with pressurized air for leak testing 13 Evacuate the system and charge it with the correct refrigerant See V A 3 Evacuation and Recharge See the nameplate for the required refrigerant and refrigerant charge 14 Install the new start relay start capacitor and external compressor overload refrigerator then reconnect the compressor wires in their correct positions WARNING To reduce the risk of electric shock be sure to reconnect the compressor ground wire 15 Plug the unit back in Move the power switch to the ON position 36 C Removal and Replacement of Evaporator See Fig 4 CAUTION 1 Always install a new drier every time the sealed refrigeration system is opened 2 Do not replace the drier until after all other repair or replacement has been made Install the new drier with the arrow on the drier in the direction of the refrigerant flow 3 When brazing protect the drier by using a wet cloth to prevent the drier from overheating Do not allow the drier to exceed 250 F 121 C 1 Move the powe
50. tch Continue to IV A 1 Refrigerator or IV A 2 Freezer 23 1 Refrigerator 7 Startup Cool Down EvapFM MH and PH energize There is a slight delay then Comp and ConFM energize and cabinet temperature appears on DM 8 Startup Diagnosis Check that EvapFM energizes If not confirm that the door s are closed and DS contacts are closed Check EvapFM blade for binding Next check for 115VAC at DSR terminals 7 white W and 8 light blue LBU If 115VAC is not present check DS continuity If 115VAC is present check DSR coil continuity and contact continuity between terminals 6 white W and 3 dark blue DBU If coil or contacts are open DSR is bad and must be replaced If DSR is good check EvapFM continuity b Cool Down Diagnosis Confirm that Comp and ConFM energize and cabinet temperature appears on DM If not confirm 115VAC between CM L3 and CM N5 If 115VAC is not present confirm wiring connections are secure for both the power wire CM L3 and the neutral wire CM N5 If 115VAC is present and DM is off check that the display cable between CM and DM is not disconnected reconnect if loose If DM is still off CM or DM may be bad so replace both Next check that Comp and ConFM are energized If not check for 115VAC between CM C1 and If 115VAC is present between CM L3 and CM N5 above and not between CM C1 and CM N5 check CTh status See IV C Thermistor Check If CTh ohm reading is in proper range
51. thermistor from the evaporator fan shroud 3 Note the location of the defrost thermistor then remove the defrost thermistor 4 Remove the control box cover 5 Disconnect the defrost thermistor from the control module then remove the defrost thermistor 6 Route the new defrost thermistor from the control box to the evaporator Insert the defrost thermistor in its correct position If replacing on a refrigerator secure the defrost thermistor wire with a tie to the clip WARNING On freezers be sure the thermistor wire is not touching the defrost heater 7 Secure the cabinet thermistor to the evaporator fan shroud Replace the evaporator fan shroud in its correct position 8 Connect the defrost thermistor to the control module then replace the control box cover in its correct position 9 Plug the unit back in Move the power switch to the ON position Refrigerator Freezer THOSIIZAKT COMMERCISLEEAES Defrost Thermistor Clip and Tie Defrost Thermistor Evaporator Fan Shroud EE 44 J Removal and Replacement of Condensate Pump 1 Move the power switch to the OFF position then unplug the unit 2 Remove the control box cover then disconnect the condensate pump wires
52. ture and the temperature setpoint is saved For refrigerators the temperature setpoint is adjustable between 33 F and 52 F 1 C and 11 C Factory default is 36 F 3 C For freezers the temperature setpoint is adjustable between 16 F and 12 F 27 C and 11 C Factory default is 4 F 20 C c Changing the Temperature Display Scale F or C To change the temperature display scale press the upper button for 5 seconds The current setting is displayed Press the upper button to change the scale After a few seconds the display returns to the current cabinet temperature and the setting is saved The factory default is F Note Pressing the upper and lower button at the same time for 5 seconds or until appears on the display module turns the compressor condenser fan motor and evaporator fan motor freezer off To turn the unit on again press the upper and lower button together for 5 seconds until the cabinet temperature appears on the display module d Manual Defrost Manual defrost may be initiated by pressing and holding the lower button for 5 seconds dEF appears in the display For further details see II B 1 Sequence Cycles and Shutdown D Control Module All models are pretested and factory set CAUTION 1 The control module is fragile handle very carefully 2 Do not change wiring and connections Never misconnect terminals 3 Do not short out power supply to test for voltag
53. ue1seg umog 10092 uMog j005 dnueis uo 19MOd 02 C Display Module When the power switch is moved to the ON position there is a slight delay then the current cabinet temperature is displayed From the display module the cabinet setpoint and temperature display scale can be changed For further details see II C 2 Controls and Adjustments 1 Display Module Layout Display Module To Control Module X Display Cable Upper and Lower Buttons LED Display Fig 1 2 Controls and Adjustments a Default Settings 1 Temperature Setting Refrigerator 36 F 3 C Freezer 4 F 20 C 2 Temperature Display Scale F b Temperature Setpoint The temperature setpoint is the value for the average cabinet temperature The temperature differential for the compressor to turn on and off is 3 F 1 7 C of the temperature setpoint for refrigerators and 2 F 3 F 1 1 C 1 7 C of the temperature setpoint for freezers For example for a refrigerator temperature setpoint of 36 F 2 C the compressor comes on at 39 F 3 7 C and the compressor goes off at 33 F 0 3 C If necessary adjust the temperature setpoint as follows 1 Press and hold the upper or lower button briefly then release The current temperature setpoint flashes Press the upper or lower button until the desired value is displayed After a few seconds the display returns to the current cabinet tempera
54. y timer starts 3 minute Comp delay timer terminates Comp ConFM and EvapFM energize 10 minutes later 13 minute temperature display delay timer terminates and cabinet temperature returns to DM Note There is a 4 hour minimum defrost interval Legend CM control module Comp compressor ConFM condenser fan motor CTh cabinet thermistor DH defrost heater DM display module DTh defrost thermistor EvapFM evaporator fan motor MH mullion heater PH perimeter heater 11 2 Sequence Flow Charts a Refrigerator awn 150 LUNWIXeW 4nou L 1 awn 1s04Jep uunuuiuiu ejnurur oz au SI eunjejedujej uoneuiuue s0Jjep usym sy1e s sawn Aejdsip ejnuiu z p seziB1eue ep duo U UM syges yo duo wnwiulw 111 9 seziBjeue duo usym sy1e s uo dwog wnwiuiw ejnurur z q SH uo peuedo si 1000 Jaddn usym pue S4 uo peuedo si 100p U UM 21 N de 3 e Joyesy 4 Jayesy uo nu HIA JOJOW UP JOJeJodena 14 den3 10 SIU119Y 1504 10 1015 41 94 jeuirqego u LO JOJ OW UP Jesuepuoo N JUO 2S Jossaidwoo dwiog SJON 21 pezi amp ieue ep 14402 21 14402 peziB1eue Hd peziBjeue HIN pezibueue ep 04023 peziB1eue ep dwoy peziB1eue HIN 21 Wadena peziB1eue Hd 2 Hd 2 14063 2 NJuo5 2 HIN 21
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