SafeTemp Service Manual
Contents
1. o oo AVY d Q x 7 x gt o o myn 1 1 Er a o g o Ha FT ET Ea 28 sume soo HIRS Wood HOIS W000 HOLIAS X000 6 o gt gt 8 o e gt ive ale r j O c HVH 150880 MWM E gt o as HWHMISW ee hd oO L w c o INON 4 w am ITT TW EY RM ELIS HN S Uy wE H q AA TU c eee am E o E m mu o yw CON Mi Pay E OES d NISL 1Y NG NSS ml _ 5 o M AYEM USC 88 gt o o AL o 300 8010 391M ate mW NHYSGOD ls Oo s m na ec Weg YSN M i A O o r nan gt 2 yd og I I a 8 o O cnw n WINS dy d by a Kej x t lt I a a an o Q AL c o p AYB DS G E lt D D gt A HOLIMS 23M0d o a Ot c S Sg o 5 9 o aw C WQ E 0S T uh E2 FH2 AAC HD auxiliary code P 6 and later 39 AAC W F RH1 9ISd 02 07 pesolo ui inO 5ISd 0L 06t u do Ino InO pesojo Aj euuou uoiMS eunsseud ey ANVONNGSY v18 H au 300 4010 341M lt J MM LW HI ZEEN ND BIS A HDLIAS M3MOd CAUTION Before diagnosing and or servicing the unit confirm that yo2. uiui o g 440 JeleeaH ewel4 NO 440 ue4 1ojeJodeA3 NO 440 ue Jesuepuoy NO 440 Jossejduo5 NO 9n eA 19S 1q JolsiuueUdL 1euiqe enjeAjes eid en eA 1es eld Jojsiuueu 1soJJjedg anleA19S ejd 10 2 Freezer a Sequence of Operation POWER ON Initiate Defrost 1 Compressor off 2 Evaporator fan off 3 Condenser fan off 4 Defrost heater on 5 dEF displayed 6 Frame heaters on Cycle On Cut on temperature reached Minimum 2 0 minutes 1 Compressor on 2 Condenser fan on Defrost End Defrost thermistor reaches 100 F Defrost heater off Cycle Off Cut out temperature reached Minimum 2 0 minutes 1 Compressor off 2 Condenser fan off Defrost Start Preprogrammed time interval 1 Compressor off 2 Evaporator fan off 3 Condenser fan off 4 Defrost heater on 5 dEF displayed Defrost End Defrost thermistor reaches 100 F Defrost heater off Cabinet thermistor drops to 15 F above setpoint 1 rEC no longer displayed cabinet temp displayed Normal cycling continues Five minutes after defrost heater off 1 Compressor on 2 Condenser fan on 3 rEC displayed Evaporator temperature drops to 70 F 1 Evaporator fan on Cabinet thermistor drops to 15 F above setpoint 1 rEC no longer displayed cabinet temp displayed Five minutes after defrost heater off 1 Compressor on 2 Condenser fan on 3 rEC displayed Evaporator tempera
3. legs 4 casters are standard 1651 8 65 in mm in 823 __ 33 6 in _ 793 8 31 3 in i V ll General Information A Seguence of Operation and Timing Charts 1 Refrigerator a Seguence of Operation POWER ON 2 0 minute delay Cycle Off Cut out 1 Compressor start up temperature reached 2 Condenser fan start up Minimum 2 0 minutes 1 Compressor off 2 Condenser fan off 1 Frame heaters on 2 Evaporator fan on Cycle On Cut on If evaporator temperature Evaporator temperature temperature reached reaches 13 F unit initiates reaches 40 F defrost Minimum 2 0 minutes defrost Defrost initiation for terminated 1 Compressor on RH1 AAC W is 7 F 1 Compressor on 2 Condenser fan on 1 Compressor off 2 Condenser fan on 2 Condenser fan off Note Evaporator fan is on Normal cycling continues Note The start circuit of the compressor is timed such that at power up and during any compressor off time there will be at least a 2 minute delay before the compressor will start The compressor has a 2 minute minimum run time during every run cycle The only exception is when the overload activates and deactivates b Timing Chart For Refrigerator soeg unu o g N O JeMOd lt sonulul oull uiu o g uiu orc
4. 852 3 33 6 in 698 5 27 5 in 793 8 31 3 in 3 OI j 4 8 A e 8 lt o s S Db od i NI 7 U U Shown with optional 6 legs 4 casters are standard 3 RH2 AAC HD FH2 AAC HD 25 in a o 170 T 6 7 in e po lt r 5 MH m amp ll d S J i n i s 8 105 STAYSOPENPOS g lll o too NEUE NN dl 1737 68 4 in 1397 55 0 in E em M ERE A A NEE PINSEL TAAA il lt m Y 89 CN H m Shown with optional 6 legs 4 casters are standard mm in 1651 8 65 0 in 4 RH3 AAC HD 170 6 7 in p 1485 4 58 5 in at 90 door open position LG X o 9 o ed gt e O s i m z U o o 633 1 25 in ae 24354 95 9 in 2095 5 82 5 in s ME IERI in VM S Ww i n e imd i i E 3 De Oo i x H H T Shown with optional 6
5. I NWFN FRAN CU FE FEDR 18 eL sgio 28g ud EN ce ee ee r tue ERE omittit pu UR eMe EM III S ME 18 IV Removal and Replacement of Components a nrnna 21 A Service for Refrigerant Lines pp 21 1 Refrigerant Recovery U U 21 2 ai Le BREST O O O O O O RG RI asss EY NF YF YN Y 21 3 Evacuation and Recharge R 134a R 404A 22 B Removal and Replacement of Compressor ON 23 C Removal and Replacement of Expansion Valve ppp 24 D Removal and Replacement of Evaporator 25 E Removal and Replacement of Door Gasket pp 25 F Removal and Replacement of Door Closure Spring 26 G Door Re HingiNg so sleet O FAD HU dn NU OT 27 H Removal and Replacement of Control Module 28 I Removal and Replacement of Thermistors pp 29 V Cleaning Instructions Ena 32 VI Wiring lB Lo es ca eee mene reper oer NO prora e abc Orr HF FFF CA NR SF TNS HT NN FYS 33 A IUE E ob NEN NET FR A R NY FR YR TEM 33 BH mun E OO 34 G RH AAGC HID T Hewe 35 D1 FH1 AAC HD auxili
6. 2 Non condensibles in 2 Evacuate and recharge system f Location of Unit 1 Restricted air flow to 1 Move unit or increase condenser ventilation 4 Cabinet temperature a Thermistor 1 Defective 1 See II C Thermistors too high compressor Check and replace will not start b Compressor Relay 1 Defective 1 Check and replace c Control Module 1 Defective 1 Replace 18 Possible Cause 5 Cabinet temperature a Setpoint 1 Incorrect 1 Correct setpoint See too high II B 1 b Temperature Setpoint b Door 1 Not sealing or open for 1 Check for sealing check for long intervals door open at time of warm cabinet temperature c Defrost 1 Not enough defrosts 1 See II B 1 c Defrost occurring per day Operation in humid conditions d Refrigerant 1 Repair leak and recharge 1 Check and replace f Air Filter 1 Clogged g Condenser 1 Dirty 1 Thermistor 1 See II C Thermistors Check and replace 6 Cabinet temperature a Control Module 1 Defective display indicator does not illuminate properly 7 Cabinet temperature 1 See II C Thermistors too low Check and replace welded c ive h Control Module 1 Defective 1 Replace 8 Evaporator does a Defrost Thermistor 1 Defective 1 See II C Thermistors not defrost completely Check and replace b Defrost 1 Not enough defrosts 1 See II B 1 c Defrost occurring per day Operation in humid conditi
7. Adjust and tighten 2 Replace d Relay 1 Chattering 1 Replace 20 IV Removal and Replacement of Components IMPORTANT 1 Ensure all components fasteners and thumbscrews are securely in place after the equipment is serviced 2 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 3 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 4 Do not leave the system open for longer than 15 minutes when replacing or servicing parts A Service for Refrigerant Lines WARNING Do not use R 134a or R 404A as a mixture with pressurized air for leak testing Refrigerant leaks can be detected by charging the unit with a trace of refrigerant raising the pressure with nitrogen and using an electronic leak detector 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 2 Brazing WARNING Refrigerants R 134a and R 404A themselves are not flammable at atmospheric pressure and temperatures up to 212 F 100 C for R 134a and 176 F 80 C for R 404A Refrigerants R 134a
8. This manual should be made available to the technician prior to service or maintenance CONTENTS Bosse lle I9 1 YS FN FR AR NA FER EY NE RH FU TRUE RR 5 A Nameplate Ratings Klinik BAY NEW AR ANN ol ono d ded gel 5 B DIMENSI NS RT 5 1 Notes for All Units pp 5 2 RH1 AAC HD FH1 AAC HD r rrasssssssssssa 6 3 RH2 AAC HD FH2 AAC HD nnne nnne nennen nennen nne 7 4 RHS AAC HD e c 8 i General Imformati nm uu stt eee di Drama u phat rena kB aaa NON SWYN GANADA SOAR AB ipn RI UU FAU 9 A Sequence of Operation and Timing Charts pp 9 HPI USE WON f 9 CM Ici RT M PCT 11 B Control Mod le c n 13 1 Settings and Adjustments a 13 2 Service WGI ORC RE 14 CT UC us MEET 16 1 Cabinet Thermistor SEN1 white and black leads 16 2 Defrost Thermistor SEN2 black and red leads 16 3 Thermistor Check Procedure pp 16 D Compressor Protector pp 17 E Safety Devices ST eT YR Y ER ERTH Y RC FAN H 17 1 Pressure S UID uuu TF EY ENTRY RE NE FN FA AF 17 2 Defrost Protection ANAN SR ERN n EK ANNA NIONOD 17 F Perimeter Frame Heater pp 17 III Service Diagnosis
9. 20 If the control does not read 32 F the control module must be calibrated Continue to step 15 29 3 Calibrate Control Module 15 Make a note of the display temperature 16 Enter the menu for the control module by pressing the down arrow button and the F button at the same time and release The display should now read dlF Press the F button until it reads CAL press F once more it should read 00 17 Press the up or down arrow button to change 00 to the number in the chart below that corresponds to the display temperature noted at step 15 If temperature is Change 00 in Cal Step 1 18 Press the SET button and wait for the temperature display to stabilize 19 If the display reads 32 F the control is properly calibrated Go to step 20 If the display does not read 32 F restart from step 11 4 Thermistor Installation 20 Place the power switch in the OFF position 21 Unplug the unit from the electrical outlet 22 23 24 Remove the cabinet thermistor Install the new cabinet thermistor Route the cabinet thermistor white and black in the same manner as the original one Note It may be helpful to pull the wire leads of the new thermistor through the protective sheathing at the condenser using the old thermistor Open the control box cover and gain access to the back of the control module Remove the calibration resistor 25 Connect the new cabinet thermistor leads w
10. after these is the maximum allowable time for a defrost dUr The freezer s target is to terminate before this value is reached This Freezer Only value is a safety Indicates that the maximum time for a defrost is 60 minutes WARNING This value should never be changed from the default dEF Next display after these is the defrost termination temperature The HI freezer s target is to terminate at this value Freezer Only Indicates that the defrost termination temperature is 100 F Next display after these is the short cycle timer The short cycle time Cyc is the minimum time the compressor must remain off in an off cycle or on in an on cycle Indicates that the short cycle timer is set to 2 0 minutes Next display after these is the re initiation temperature of the n HI evaporator fan after a defrost Freezer Only Indicates that the evaporator fan re initiation temperature after a defrost is 70 F Next display after these is the defrost sensor temperature NA Indicates that the temperature of the defrost sensor is 20 F 15 C Thermistors Thermistors semiconductors are used for cabinet temperature control and defrost termination The resistance varies depending on temperature No adjustment is required If necessary check for resistance between thermistor leads and visually check the thermistor mounting 1 Cabinet Thermistor SEN1 white and black leads This temperature reading can be identified by lo
11. return to the cabinet temperature WARNING This unit has been factory tested with the default settings listed If a value is changed from the default field problems may result If a value has been changed from the default and you need to change it back use the up or down arrow buttons Display Default Refrigerator Freezer ie display is cabinet differential setting Indicates that the cabinet differential is set to 5 F Next is the maximum allowable setpoint from the setpoint 28 F menu Indicates that the maximum allowable setpoint is 55 F Next ibd is the minimum allowable setpoint from the setpoint menu Indicates that the minimum allowable setpoint is 37 F LE Next display is for calibration of the thermistor Do not adjust unless replacing thermistors 14 Display Defaut Refrigerator Freezer Next display after these is the defrost initiation 13 F NA Int temperature 7 F for Refrigerator RH1 AAC W Only Indicates that the setpoint for defrost initiation is 13 F Next display after these is the defrost termination temperature NA End Refrigerator Only Indicates that the setpoint for defrost termination is 40 F Next display after these is the number of hours between defrosts Int Freezer Only 4 Indicates that there will be one defrost every 4 hours WARNING This value should be adjusted only after consulting with the factory dEF Next display
12. Hoshizaki America Inc Commercial Refrigerators amp Freezers Models Safe Tempe SERVICE MANUAL A Superior Degree of Reliability www hoshizaki com HOSHIZAKI ISO 9001 Number 73096 Issued 10 9 2000 Revised 3 7 2007 IMPORTANT Only qualified service technicians should attempt to service or maintain this unit No such service or maintenance should be undertaken until the technician has thoroughly read this Service Manual 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 Service 770 487 2331 Fax 1 800 843 1056 770 487 3360 E mail techsupport hoshizaki com Web Site www hoshizaki com NOTE To expedite assistance all correspondence communication MUST include the following information e Model Number e Serial Number Complete and detailed explanation of the problem Please review this manual It should be read carefully before the unit is serviced or maintenance operations are performed Only gualified service technicians should service and maintain the unit
13. 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 Always recover the refrigerant and store it in an approved container Do not discharge the refrigerant into the atmosphere Do not use silver alloy or copper alloy containing arsenic Do not use R 134a or R 404A as a mixture with pressurized air for leak testing Refrigerant leaks can be detected by charging the unit with a trace of refrigerant raising the pressure with nitrogen and using an electronic leak detector 21 1 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 2 Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG 3 Check for leaks using nitrogen gas 140 PSIG and soap bubbles Do not use R 134a or R 404A as a mixture with pressurized air for leak testing Refrigerant leaks can be detected by raising the pressure with nitrogen and a trace of refrigerant using an electronic leak detector Note Because the pipes in the evaporator case are specially coated to resist corrosion it is important to make connections outside the evaporator case when possible If i
14. ary code P 7 and earlier 36 D2 FH1 AAC HD auxiliary code P 8 and later 37 E1 FH2 AAC HD auxiliary code P 5 and earlier 38 E2 FH2 AAC HD auxiliary code P 6 and late 39 I Specifications A Nameplate Ratings AC Supply Voltage Amperes HI to RH1 AAC RH1 AAC HD 115 60 1 50 2 120 FH1 AAC FH1 AAC HD 115 60 1 RH2 AAC RH2 AAC HD 115 60 1 70 240 120 11602 0 FH2 AAC FH2 AAC HD 115 60 1 450 250 2010Z RH3 AAC RH3 AAC HD 115 60 1 120 250 120 2060Z RH1 AAC W 115 60 1 450 200 12 2 OZ B Dimensions 1 Notes for All Units 1 Units shipped with 4 casters 2 Optional legs have 25 4 mm 1 in height adjustment Door Opening Total Total Shelf width Height Refrigerated Space ft mm in mm in Volume ft 11 5 681 7 26 8 681 7 26 8 40 3 Boe YS S See the nameplate for electrical and refrigeration specifications The nameplate is located on the right side wall of the cabinet interior Note We reserve the right to make changes in specifications and design without prior notice 2 RH1 AAC HD FH1 AAC HD mm in cu y MO 6 7 in 1485 4 58 5 in at 90 door open position 633 1 25 in
15. e Resistance O 17 8 12 2 32 2 1 046 N F e o 178 10 22 32 00 50 100 9o 322 16 D Compressor Protector When a combined temperature amperage value is above the limit specified by the compressor manufacturer a protector will operate independently turning off the compressor The compressor will restart when this protector has reset Note 1 Compressor protector resets automatically 2 If the condenser fan is operating and the compressor is off it is likely that the protector has operated E Safety Devices 1 Pressure Switch When pressure on the high side of the refrigeration circuit is detected to be above a preset limit a pressure switch will activate causing power to be interrupted to the compressor relay This power interruption will shut down the compressor The pressure switch will reset automatically When the pressure switch resets power will be resupplied to the compressor See VI Wiring Diagrams for preset values 2 Defrost Protection For freezers primary defrost termination is controlled by the defrost thermistor However two additional safeties are also present 1 Time Termination 1 hour maximum 2 Safety Defrost Thermostat In line with the heaters and independent of the control module F Perimeter Frame Heater This unit is equipped with a perimeter frame heater This prevents the formation of condensate on the front frame of the unit under high humidity condition
16. e Place the new expansion valve in position 6 Remove the drier then place the new drier in position 7 Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG WARNING Always protect the valve body by using a damp cloth to prevent the valve from overheating Do not braze with the valve body exceeding 250 F 121 C 8 Check for leaks using nitrogen gas 140 PSIG and soap bubbles 9 Evacuate the system and charge it with refrigerant See the nameplate for the required refrigerant charge 10 Attach the expansion valve bulb to the suction line in the same location as the previous bulb The bulb should be at the 12 o clock position on the tube Be sure to secure the bulb with the clamp and holder and to insulate it 11 Place the expansion valve cover in position 12 Replace the panels in their correct positions 13 Plug the unit back in 24 D Removal and Replacement of Evaporator IMPORTANT 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 1 Unplug the unit from the electrical outlet 2 Remove the panels and the top cover over the evaporator 3 Recover the refrigerant and store it in an approved container 4 Remove the insulation tubing and disconnect the evaporato
17. e Calibration Note The control module has been factory adjusted to the original thermistors Therefore calibration must be checked and adjusted when replacing thermistors only 5 Connect the new defrost thermistor leads to the terminals of SEN2 The red lead connects to terminal S and the black lead connects to terminal G Be sure wires are not touching at the terminal block Connect the 32 F resistor included in HS 3540 kit to SEN1 terminals G and S Securely close the control box cover 6 7 8 9 Plug the unit back in Press and hold the up arrow button on the control module while turning the power switch to the ON position Temperature is displayed 10 If the display reads 32 F the control module is properly calibrated Skip to step 20 If the display does not read 32 F the control module must be reset and calibrated Continue to step 11 SS lt v Sw hb 2 Reset Control Module 11 Enter the menu for the control module by pressing the down arrow button and the F button at the same time and release The display should now read dlF Press the F button until it reads CAL press F once more it should read 00 12 If it does read 00 skip to step 15 If it does not read 00 press the up or down arrow button to change it to 00 13 Press the SET button and wait for the temperature display to stabilize 14 If the control reads 32 F the control is properly calibrated Skip to step
18. e P AAC D2 FH1 i a a B NM E ES LI wa Er T pum Hi gj ETY ELM T mE UHM IBI D my 0 mm p w 6 an A0 x LE won L 0 SONVUO gt 6 AY EM NOSSO NMONB Wd Fr 3003 010 IN gt ia 2 EL alt O Before diagnosing and or servicing the unit confirm that you have the proper wiring diagram by checking against the diagram located on the evaporator o gt o o o t o 37 5 and earlier HD auxiliary code P AAC E1 FH2 5lSd 0cFOZ pesolo ul IND SISd 01706 uedo 1no InO pesolo Aj euuou u3S1lAS eunsseud AINO 3000 Z 4 mx al HOMS X000 HOLIMS 4000 m a FOLKS 400d IDIMS 4000 AVY ISOHD0 Py AOLE 1V OW dV NN H E K gq aTe HUAS 33804 TT 710 fid 1 300 4010 3UIM CAUTION Before diagnosing and or servicing the unit confirm that you have the proper wiring diagram by checking against the diagram located on the evaporator case 38 DISd 0c 07 pesolo ui InO SISd 01706 uedo no n9 pesolo Aj euuou uoiMSg eunsseud
19. ets 2 Remove the bushing cover from the top of the spring cartridge assembly Pivot Pin Hinge Stop Pin Hinge ee k Hinge Bracket Bushing Cover _ Screw Spring Guide Pin 3 Insert a small drift pin or long leg of an allen wrench into one of the threaded tension screw holes in the spring guide pin Turn the spring guide pin to access the tension screw Securely hold the spring guide pin in this position while removing the tension screw Carefully rotate walk the spring guide pin to release spring tension 4 Use a 1 2 socket wrench to remove the top pivot pin and hinge washer from the top hinge bracket 5 Firmly grasp the door and pull it forward at the top Then raise the door disengaging it from the bottom pivot pin 6 Remove the spring guide pin and spring from the spring cartridge 7 Replace the spring with one of the same color Be certain that the spring ends are engaged in both the spring cartridge and the top of spring guide pin 8 Repeat steps 1 through 7 for additional Side Color PartNumber doors as necessary ARDD 9 Reverse procedure to reassemble door s 4A3312 01 to cabinet Note Tighten spring guide pin one complete rotation to set proper spring tension 26 G Door Re Hinging The door on any unit is reversible as shown below Depending on the model and door configuration instructions for re hinging the door s will vary Instructions for re hinging are provided in the ki
20. g valve or liguid dispensing device to add the remaining liguid charge through the low side access port with the unit running 9 Close the two refrigerant access valves and disconnect the hoses and service manifold 10 Cap the access valves to prevent a possible leak 22 B Removal and Replacement of Compressor IMPORTANT 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 Note When replacing a compressor with a defective winding be sure to install the new start capacitor and start relay supplied with the replacement compressor 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 Do not mix lubricants of different compressors even if both are charged with R 134a or R 404A except when they use the same lubricant Unplug the unit from the electrical outlet 2 3 Remove the panels Recover the refrigerant and store it in an approved container A 0 N N N YN N N S NS NS N Remove the terminal cover on the compressor and disconnect the compressor wiring O1 Remove the hold down bolts washers rubber grommets and sleeves 6 Remove the discharge and suction pipes Remove the compres
21. he display will return to normal and the setpoint will remain unchanged 13 c Defrost 1 For Refrigerators This unit uses an off cycle defrost A thermistor in the evaporator coil determines the need for a defrost When the sensor reaches the initiation setpoint the unit enters defrost When the unit reaches the termination setpoint the unit ends defrost The off cycle defrost reguires no programming it automatically initiates and terminates 2 For Freezers This unit is preset at the factory to defrost 6 times per day for general conditions Please note that the defrost is a heated defrost and therefore will have a tendency to raise the cabinet temperature Cabinet temperature is not displayed during defrost dEF is displayed in its place Five minutes after defrost ends the display changes to rEC recovery period Once the cabinet thermistor drops to 15 F above the setpoint the display reverts back to cabinet temperature 2 Service Menu The menu may be used to view settings and the defrost thermistor temperature and to make adjustments to the defrost freguency To access this menu press and hold the F and down arrow buttons Once released you will have access to the menu To advance to the next display press F To store changed settings you may either advance through all menus by pressing F until you return to cabinet temperature or you may press SET Either procedure will store changed settings and
22. hite and black to the terminals of SEN1 Connect the white lead to terminal S and the black lead to terminal G Note There is a blank terminal between terminals S and G 26 Remove the defrost thermistor red and black from the evaporator Route the replacement defrost thermistor using the same routing as the original Be careful not to pull or damage the metal end cap of the thermistor sensor Wire tie the thermistor wiring to the plastic clip To prevent condensate water from running into the thermistor provide a low point in the wiring below the thermistor 27 Connect the new defrost thermistor leads red and black to the terminals of SEN2 Connect the red lead to terminal S and the black lead to terminal G 30 28 Tie the excess thermistor wire length together and place it behind the control box 29 Connect all wiring to the control module Be sure wires are not touching at the terminal block connection 30 Replace all parts and panels in their correct positions 31 Plug the unit back in 31 V Cleaning Instructions 1 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 cabinet interior should be cleaned periodically with a mild soap or detergent Door Gaskets Both door gaskets should be cleaned regularly with mild soap and wate
23. oking at the temperature shown on the display However in some cases the display may be reading dEF In this case turn the unit to the OFF position Next press the up arrow button while turning the unit ON with the toggle switch This will by pass the initial defrost cycle and allows the display to show the cabinet thermistor reading This temperature should correspond closely with the actual cabinet temperature 2 Defrost Thermistor SEN2 black and red leads This temperature reading can be found by entering the service menu To access this menu press and hold the F and down arrow buttons Once released dlF is displayed and you have access to the menu To advance to the next display press the F button Press F until SEn is displayed Press F one more time and this reading should be the evaporator coil temperature Note This thermistor is mounted in the evaporator therefore when the machine is in the freeze cycle you will see temperatures that correspond to actual evaporator temperature 3 Thermistor Check Procedure 1 Unplug the unit from the electrical outlet and disconnect thermistor leads on the control module 2 Remove the thermistor 3 Immerse the thermistor sensor portion in a glass containing ice water for 2 or 3 minutes 4 Check for a resistance between thermistor leads Replace the thermistor if it exceeds the normal reading See IV l Removal and Replacement of Thermistors Temperatur
24. ons c Defrost Heaters 1 Defective 1 Replace heaters freezers only d Safety Defrost 1 Defective turning off 1 Replace safety defrost Thermostat heaters prematurely or thermostat freezers only fused open 9 Defrost cycle a Defrost Thermistor 1 Replace lasts too long b Control Module 1 Replace c Defrost 1 Not enough defrosts 1 See II B 1 c Defrost occurring per day Operation in humid conditions d Defrost Heaters 1 Defective 1 Replace heaters freezers only e Safety Defrost 1 Defective turning off 1 Replace safety defrost Thermostat heaters prematurely or thermostat freezers only fused open 19 Possible Cause 10 Condensate a Cabinet Contents 1 Loading of large 1 Cover product with plastic water overflow volumes of warm moist wrap uncovered product b Location of Unit 1 Unit located near high 1 Relocate humidity source such as fryer steamer etc 1 Poor sealing around 1 Adjust or replace evaporator door gaskets d Environment 1 Extreme environment 1 Adjust conditions and door opening conditions 11 Abnormal Noise a Fasteners 1 Loose fasteners allow 1 Tighten fasteners vibration of part Compressor 1 Problem with mount 1 Properly mount compressor Replace any missing grommets 2 Floodback to 2 Check for signs of floodback compressor to compressor Evacuate and recharge if necessary b 3 Replace c Fan 1 Fan blade loose 1
25. r inlet and outlet tubing Elevate the evaporator to avoid overheating the evaporator housing 5 6 7 8 Place the new evaporator in position Remove the drier then place the new drier in position Check for leaks using nitrogen gas 140 PSIG and soap bubbles Evacuate the system and charge it with refrigerant See the nameplate for the required refrigerant charge lt lt sb 9 Replace the removed parts in the reverse order of which they were removed 10 Replace the top cover and the panels in their correct positions 11 Plug the unit back in E Removal and Replacement of Door Gasket CAUTION In order to get a proper gasket fit it is important not to stretch gasket material during assembly 1 Remove old gasket by pulling it directly out of the vinyl gasket retainer 2 Thoroughly clean the gasket area with mild soap and water prior to installing the new gasket 3 The new gasket should be installed by assembling it at the corners first then working toward the center at the top bottom and sides 4 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 25 F Removal and Replacement of Door Closure Spring CAUTION Wear eye protection and use caution when removing the tension screw step 3 1 Open the front panel assembly to gain access to the upper hinge brack
26. r to remove dirt and grease Air Filter Check the filter at least once a month lf it is dirty use warm water and a neutral cleaner to wash the filter The filter is located behind the upper front panel This filter can be removed by bending the condenser filter bracket back sliding the filter up and out and allowing the bracket spring back into place Condenser Filter Bracket Condenser Check the condenser once a year and use a brush or vacuum cleaner to clean the unit as required GG AN 74 Yy N 32 VI Wiring Diagrams A RH1 AAC HD 270 10 PSIG 190 20 PSIG TDC 110 01 CONTROLLER TE j Pressure Switch normally closed WIRE COLOR CODE BRG CAUTION Before diagnosing and or servicing the unit confirm that you have the proper wiring diagram by checking against the diagram located on the evaporator case cover 33 B RH2 AAC HD Ex eo 4 z iE lolo a NIN E JE a a 3 z o e ot J AN s HI H o OJo F 6 D NIS a COMPRESSOR RELAY BU P HEATER ROCKER SWITCH DOOR SWTCH DOOR MIH Fi Eid BK Y Pressure Switch normally closed Cut out open Cut in closed WIRE COLOR CODE CAUTION Before diagnosing and or servicing the unit confirm that you have the proper wiring diagram by checking agains
27. rminal between terminals S and G 8 Remove the defrost thermistor red and black from the evaporator Route the replacement defrost thermistor using the same routing as the original Be careful not to pull or damage the metal end cap of the thermistor sensor Wire tie the thermistor wiring to the plastic clip To prevent condensate water from running into the thermistor provide a low point in the wiring below the thermistor 9 Connect the new defrost thermistor leads red and black to the terminals of SEN2 Connect the red lead to terminal S and the black lead to terminal G 10 Tie the excess thermistor wire length together and place it behind the control box Insert the new control module into the front of the control box taking care not to damage it 11 Hook all wiring connections back to the control module Be sure wires are not touching at the terminal block 12 Replace all parts and panels in their correct postions 13 Plug the unit back in 3 Open the control box cover 28 I Removal and Replacement of Thermistors IMPORTANT When replacing a faulty thermistor it is necessary to a Verify the control module calibration b Replace both the cabinet and defrost thermistors 1 Unplug the unit from the electrical outlet 2 Remove the panels and the top cover over the evaporator 3 Open the control box cover 4 Disconnect all thermistor leads from the control module 1 Determine Control Modul
28. s If operating the unit under conditions where condensate will not form these heaters may be turned off using the switch on the control box 17 lll Service Diagnosis A Diagnosis Chart 1 Compressor will a Power Supply 1 Move to ON position a c Ground Fault Circuit T d Transformer 1 EI coil india 1 Check Say and replace e Wiring to Control Module 1 Tighten 2 Faulty 2 Check continuity and replace f High Pressure Switch 1 Bad contacts 1 Check continuity and replace g Thermistor 1 Defective 1 See II C Thermistors Check and replace h Control Module 1 Defective 1 Replace control module i Compressor Overload 1 Defective contacts 1 Replace open j Compressor 1 Open windings 1 Check continuity and k Compressor Relay Bad contacts 2 ET coil winding 2 a and replace 2 Compressor will a Voltage 1 Call electrician not run draws b Start Relay 1 Bad contacts 1 Replace current and trips TW 2 Open coil windings 2 Replace on overload 1 Locked rotor 1 Replace d Start Capacitor 1 Defective 1 Check and replace 3 Compressor runs a Voltage 1 Call electrician intermittently and 2 Too high 2 Call electrician ipe on overload b Condenser Filter 1 Clogged 1 Clean filter c Refrigerant Line or 1 Plugged or restricted 1 Clean and replace drier Component d Condenser Fan Motor 1 Replace _ e Refrigerant Evacuate and recharge
29. sor Unpack the new compressor package 8 9 10 11 12 13 14 Attach the rubber grommets of the prior compressor Place the compressor in position and secure it using the bolts and washers Remove the drier then place the new drier in position Remove plugs from the suction discharge and process pipes Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG Check for leaks using nitrogen gas 140 PSIG and soap bubbles Evacuate the system and charge it with refrigerant See the nameplate for the required refrigerant charge 15 Connect the terminals and replace the terminal cover in its correct position 16 Replace the panels in their correct positions 17 Plug the unit back in 23 C Removal and Replacement of Expansion Valve IMPORTANT Sometimes moisture in the refrigeration circuit exceeds the drier capacity and freezes up at the expansion valve 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 1 Unplug the unit from the electrical outlet 2 Remove the panels 3 Recover the refrigerant and store it in an approved container 4 Remove the insulation and the expansion valve bulb on the suction line 5 Remove the expansion valve cover and disconnect the expansion valv
30. t is necessary to braze inside the evaporator case use sandpaper to remove the coating from the brazing connections before unbrazing the components 3 Evacuation and Recharge R 134a R 404A 1 Attach a vacuum pump to the system Be sure the charging hoses are connected to both high and low side lines IMPORTANT The 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 backward 3 Allow the vacuum pump to pull down to a 29 9 Hg vacuum Evacuating period depends on pump capacity 4 Close the low side valve and high side valve on the service manifold 5 Disconnect the vacuum pump and attach a refrigerant service cylinder to the high side line Remember to loosen the connection and purge the air from the hose See the nameplate for the reguired refrigerant charge Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets ARI Standard No 700 88 be used 6 A liguid charge is recommended for charging an R 134a or R 404A system Invert the service cylinder and place it on scales Open the high side service manifold valve 7 Allow the system to charge with liguid until the proper charge weight is met 8 If necessary add any remaining charge to the system through the low side Use a throttlin
31. t the diagram located on the evaporator case cover 34 AAC HD C RH3 9ISd 0c 06L pesolo ui inO SISd 0L 0Zc uedo lno lnD 300 8010 3818 lt o o o lt o o te o gt o c 2 o gt x oO lt we E lt c o o c c 5 o ie p D Q gt lt o o lt o o c o D Em D c D S o o lt o o o m lt o 9 o lt o o o gt o o a o o oO 2 CS o E o lt D S o 0 end o o D o D o o x o gt O E o lt D S o D yx o gt o o o o cU o DISd 02 07 pesojo ul IND SISd 0L 06t uedo 1no jn5 pesojo AjjewJOU UolHAS eunsseud 7 and earlier HD auxiliary code P AAC D1 FH1 NO 38000 Z L pain ERS WDD 300 3010 3NI CAUTION Before diagnosing and or servicing the unit confirm that you have the proper wiring diagram by checking against the diagram located on the evaporator case 36 8 and later 5lSd 0c 07 pesolo ui inoO SISd 0L 06t u do no n9 pesolo Ajjeuuiou YO MS eunsseud S3IH3S NI 03yIA 38 ISAW SM31VJH 100 HD auxiliary cod
32. tom of the panel up and allow the panel hinges to catch securely on the side panel frames in the locked position the control module can then be accessed Front Panel FAN COMP X DEF e A 30 V22 _ esr CONTROL PRODUCTS INC USA Control Module 1 Settings and Adjustments a Current Temperature Display The cabinet temperature is displayed on the control module The cabinet temperature is displayed in F only The cabinet temperature is updated every 2 seconds e When the fan compressor and defrost are initiated the corresponding indicator lights will switch on b Temperature Setpoint The temperature setpoint is the temperature at which the compressor comes on For refrigerators the temperature differential for the compressor to turn off is 5 F below the setpoint For freezers the temperature differential for the compressor to turn off is 6 F below the setpoint If necessary adjust the setpoint temperature as follows 1 Press SET The display reads SP1 2 Press SET The display reads Current Setpoint 3 Use the up down arrows to change the setpoint For refrigerators the cabinet temperature is adjustable between 37 F and 55 F The factory default is 39 F For freezers the cabinet temperature is adjustable between 10 F and 28 F The factory default is 1 F for the FH1 AAC HD and O F for the FH2 AAC HD 4 Press SET to save If no button is pressed in 15 seconds t
33. ts listed below Door Type Right to Left HS 3527 Left to Right HS 3528 Right to Left HS 3529 Left to Right HS 3530 The door hinges on the right cabinet wall The door is rotated and hinged on the left cabinet wall 27 H Removal and Replacement of Control Module IMPORTANT 1 Both thermistors cabinet and defrost must be replaced with the ones supplied by the factory with the replacement control module 2 Thermistors are factory calibrated to the new control module No control module calibration is needed 3 When connecting wires to the control module terminals make sure that no wire strands are touching neighboring wires Otherwise the unit may not operate correctly 1 Unplug the unit from the electrical outlet 2 Remove the panels and the top cover over the evaporator 4 Unhook all wiring connections to the control module 5 Remove the control module by carefully squeezing the mounting tabs and pushing the control module through the front of the control box 6 Remove the cabinet thermistor Route the cabinet thermistor white and black in the same manner as the original one Note It may be helpful to pull the wire leads of the new thermistor through the protective sheathing at the condenser using the old thermistor 7 Connect the new cabinet thermistor leads white and black to the terminals of SEN1 Connect the white lead to terminal S and the black lead to terminal G Note There is a blank te
34. ture drops to 70 F 1 Evaporator fan on Note For freezers defrost will be initiated at power up To bypass initial defrost press and hold the up arrow button on the control module while turning on the toggle switch The display should read a temperature There will be at least a 2 minute delay before the compressor will start even if the initial defrost cycle is bypassed The compressor has a 2 minute minimum run time during every run cycle The only exception is when the overload activates and deactivates 11 b Timing Chart For Freezer ues isojjed sinou p ejo o 1s0JJep jenu se yeedey uu Q c uiodjes eAoqe 494 speed 4ojsiuuieun jeuigezs O uomeniur uej 101e10de e 104 dwa jeseud uiui Qe 4 02 due iolsluuedl isogeg 4 001 duel Jojsiuueu jsoyoq uiui o e uiui O S NO Jewod 4 dul uiu s NO 49129H 9UI8J4 440 Joleolpul AieAoo u NO 440 Joleolpul 1s04Jeq NO 440 JejeeH 1sojJed NO 34O ue 10je1ode 3 NO 440 ue 1 su puoo NO 440 Josseuduio NO anleA1es eld JolslIuuedL Jouiqe en eA 1es eJd Bujueew oN Joj1siuleu 1s04Jeq en eA 8S 1d 12 B Control Module The control module for AAC models is located on the face of the refrigeration circuit behind the front panel To open the front panel swing the bot
35. u have the proper wiring diagram by checking against the diagram located on the evaporator case 40
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