RNC-A SERIES
Contents
1. ff WATERPROOF COVER To prevent the entrance of water the Circuit Breaker is provided with a nonrigid plastic Waterproof Cover When it is damaged and needs to be replaced remove the parts around the Circuit Breaker in accordance with the removal procedure in e BREAKER COVER AND LOUVER 1 Before Auxiliary Code H 1 The Waterproof Cover is secured with a stainless steel band as shown below To remove the Cover loosen the M4 screw stainless steel 4 x 8 After replacing the Cover refit the removed parts in the reverse order of the removal procedure Waterproof Cover Circuit Breaker M4 Truss Head Machine Screw stainless steel Band stainless steel M4 Hexagon Nut stainless steel au EAT EMEN Duct 74MA5270002 1 3 2 After Auxiliary Code H 2 The Waterproof Cover is secured with a vinyl tape as shown below After replacing the Cover wind a new vinyl tape and refit the removed parts in the reverse order of the removal procedure Circuit Breaker Vinyl Tape Waterproof Cover Duct Fig 7 The users are instructed to ask service personnel for replacement of the Waterproof Cover as required The part code for the Waterproof Cover is 1 3R2669 01 before auxiliary code H 1 2 454364 01 after auxiliary code H 2 14 74 5270002 74MA5270002 9 REFRIGERANT SERVICE INFORMATION 1 Allowable Compressor Opening Time and Prevention of Lubricant Mixture R134a The compr2. 1 3 8 Pipe 1 2 DIA L2 L3 Interior sx o T Lee 4 Air 13 3 4 ia L2 L3 RNC 90A RA 20 1 16 35 7 6 20 7 8 RNC 120A RA 31 7 8 47 1 4 32 11 16 74MA5270002 3 b RNC 150A RA RNC 180A RA RNC 210A RA Unit inch Power Cord 78 3 4 long outside Circuit Breaker with L shaped Plug 13 16 L1 Sliding Glass Door with Handle Uf iff of if rr rq ain ay E S _____ _ _ Air Filter 1 15 16 Drain Pipe 13 16 OD 13 16 OD im Wire 78 3 4 long outside View A Rear Air Evaporator Pipe Lo 0 2 DIA L3 Interior 1 Air 4m air x 13 3 4 g Moda ee L2 L3 RNC 150A RA 21 7 16 59 1 16 44 1 2 RNC 180A RA 27 3 8 70 7 8 56 5 16 RNC 210A RA 33 1 4 82 11 16 68 1 8 4 74 5270002 c RNC 90A LA RNC 120A LA Unit inch Power Cord 78 3 4 long outside with L shaped Plug Circuit Breaker Sliding Glass Door L1 14 3 8 with Handle Es sf uut 4 Air Filter 1 15 16 3 15 16 Drain Pipe Drain Pipe 17 5 16 13 16 OD 13 16 OD Earth Wire Vi
3. HOSHIZAKI COUNTER SHOWCASE MODEL RNC A SERIES HA SERVICE MANUAL 74MA5270002 CONTENTS PAGE 1 FOR SAFETY AND BEST OPERATING RESULTS 1 2 SPECIFICATIONS snas esee 2 3 DIMENSIONS 3 RNC 90A RA RNC 120A RA lt 5 aa 3 0 RNC 150A RA RNC 180A RA 210 4 c RNC 90A LA RNC 120A LA 5 d RNC 150A LA RNC 180A LA RNC 210A LA 6 4 PERFORMANCE DATA Meanman 7 5 REFRIGERATION CIRCUIT esse chac 8 6 WIRING DIAGRAM oon esos nsn sns 9 7 CONSTRUCTION ee essere see 10 8 REMOVAL AND REPLACEMENT 11 a FRONT GLASS AND TOP COVER 11 6 TOP FRAME oe ss Liachta 12 c SEPARATOR AND SIDE FRAME 12 d BREAKER COVER AND LOUVER 12 e PIPE HOLDER a e 13 f WATERPROOF COVER 13 9 REFRIGERANT SERVICE INFORMATION 15 10 CONSTANT PRESSURE EXPANSION VALVE AND REFRIGERANT CHARGE 1
4. Adjustment Range 1 42 42 67 PSIG Pressure Increase per Turn of Adjustment Screw 5 69 7 11 PSIG b FUNCTION Opens when the low side pressure drops and lets in the refrigerant to keep a constant pressure c CONSTRUCTION IN High Pressure Adjusting Needle Valve du STP ressure 74MA5270002 1 7 d REPLACEMENT 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 230 F IMPORTANT Always install a new Drier every time the sealed refrigeration system is opened Do not replace the Drier until after all other repairs or replacement have been made 1 Recover the refrigerant R134a and store it in an approved container 2 Remove the Insulation and the Cap from the Expansion Valve 3 Remove the Expansion Valve by heating the liquid and suction connections Wet Floorcloth Evaporator 74 5270002 74MA5270002 11 SERVICE DIAGNOSIS PROBLEM POSSIBLE CAUSE REMEDY 1 Showcase will not 1 Circuit Breaker in OFF position 1 Move to ON position start 2 Unplugged 2 Plug in 3 Power supply voltage too low 3 Give an exclusive power supply and ensure voltage within 10 percent of the nameplate rating 4 No power supply to the wall outlet Breaker or fuse blown out 4 Correct 5 Electrical circuit open or bad con
5. domestic models RNC 120A for reference KN 2106 60Hz T E KN 210G 50Hz RNC 210A E 50Hz RNC 210A g 60Hz E 5 RNC 120A 8 60Hz E RNC 120A 50Hz 17 6 5 10 15 20 25 30 35 32 41 50 59 68 77 86 95 Ambient Temperature C F 74MA5270002 7 5 REFRIGERATION CIRCUIT Refrigerant 134a Compressor Condenser Drier x Expansion Valve Evaporator Evaporator Upper Lower The Expansion Valve controls the refrigerant flow rate to stabilize the pressure at the Evaporator inlet 8 74 5270002 74MA5270002 6 WIRING DIAGRAM CM Compressor SC Start Capacitor FM Fan Motor ELB Circuit Breaker PTC PTC Thermistor OL Overload Relay 7 CONSTRUCTION Top Cover Sliding Glass Door Front Cover Z Separator Board Separator Side Glass Cover Front Glass Packing Side Side Cover Packing Front Center Frame amp Side Frame Breaker Cover 1 0 74MA5270002 8 REMOVAL AND REPLACEMENT CAUTION 1 Be sure to unplug the showcase before removing or replacing the parts 2 Handle the glass parts with care a FRONT GLASS AND TOP COVER CAUTION In some cases the Top Cover is tightly locked on the Top Frame and will not come off easily Remove it with care to avoid injury 1 Remove the Side Cover and Separator Cover Slider plastic 14
6. 5 min Ambient Temp 86 F No Load SATURATION TEMPERATURE 44 6 F Ambient Temp 86 F No Load 0 85 cu ft EXTERIOR DIMENSIONS 35 7716 59116 7078 82 11 16 1113 16 10 1 4 INTERIOR DIMENSIONS 2037 8 321116 44412 56 516 68 18 10 1 4 AC SUPPLY VOLTAGE EXTERIOR Glass Rigid PVC 5 Resin INTERIOR Stainless Steel INSULATION Polyurethane Foam DEFROST SYSTEM None COMPRESSOR Hermetic CONDENSER Fin and Tube type Air cooled Fan Motor 2P EVAPORATOR UPPER Bare Tube type LOWER Pipe on Sheet type REFRIGERANT CONTROL Constant Pressure Expansion Valve REFRIGERANT R134a BEE ERENT ENARGE Circuit Breaker Grounding Wire PROTECTION Auto reset Protector Compressor SLIDING DOOR aps ACCESSORIES BOARD CAP 2 pcs VINYL HOSE 1 pc 19 32 DIA x 3 4 DIA x 59 AMBIENT TEMP 50 86 F RELATIVE HUMIDITY Max 60 VOLTAGE VARIATION Rated voltage 10 Relative humidity exceeding 60 may cause condensation on the exterior We reserve the right to make changes in specifications and design without prior notice 2 74 5270002 3 DIMENSIONS a RNC 90A RA RNC 120A RA Unit inch Power Cord 78 3 4 long outside Circuit Breaker ta L shaped Plug 14 3 8 L1 Sliding Glass Door with Handle Drain Pipe uan Pipe 17 5116 13 16 OD 13 16 OD Earth Wire 78 3 4 long outside View A Rear
7. 7 a SPECIFICATIONS 17 o FUNCTION i7 c CONSTRUCTION 17 d REPLACEMENT 18 11 SERVICE DIAGNOSIS setora ae eee lese ssec enses nnns nnne 19 1 FOR SAFETY AND BEST OPERATING RESULTS IMPORTANT Hoshizaki Counter Showcase is intended for temporary food display Constructed with much glass this showcase gives relatively insufficient heat insulation and poor cooling performance compared with refrigerators in general For safe and efficient operation be sure to follow the instructions below 1 Do not leave foods in the showcase after service hours or they may dry or spoil 2 Foods that should not dry must be covered or wrapped up in a plastic film 3 Precool foods in a refrigerator before storing them in the showcase 4 Do not leave the Doors open or open them too frequently 5 Do not pack the showcase with foods 6 The showcase should not be exposed to direct sunlight or located next to ovens grills or other high heat producing equipment 7 The ambient temperature should not exceed 86 F 74MA5270002 1 2 SPECIFICATIONS RNC 90A RA RNC 120A RA RNC 150A RA RNC 180A RA RNC 210A RA LA LA LA LA LA 1Phase 115 120V 60Hz See ce ELECTRIC CONSUMPTION 145W 146W 195W 195W 195W POWER FACTOR 58 61 54 54 54 PULL DOWN TIME 10 C Less than 4
8. Cover ms Top Frame 2 Hold the Front Glass from both inside and outside and push it outward 3 Remove the Sliding Glass Doors and Side Glass 4 Put your hand in the channel of the Top Cover where the Front Glass was placed and lift off the Top Cover See Fig 1 Note The Top Cover cannot be removed from the rear 5 Refit the Front Glass and Top Cover at the same time as shown in Fig 2 Do not twist the Front Packing Fig 1 Front Glass Fig 2 74MA5270002 1 1 b TOP FRAME The Top Frame Aluminum on the machine compartment can be removed by unfastening two screws on the top and two screws on the side The Top Frame on the refrigerated compartment can be removed by unfastening four screws on the top and two screws on the bottom for the Space Separator or Center Frame and by removing the Evaporator Side Frame Pipes from the Pipe Holder See Fig 5 To assemble the Top Frame with the Separator or Side Frame push the Top Frame to the rear end and secure it with the screws Otherwise the Top Cover cannot be mounted See Fig 3 Fig 3 c SEPARATOR AND SIDE FRAME The Separator and Side Frame on the refrigerated compartment are sealed with transparent silicone sealant where in contact with the Water Pan Stainless Steel Be sure to reseal those parts when reassembling them To shut out hot air from the machine compartment seal the top of the Separator d BREAKER COVER AN
9. D LOUVER 1 Remove the Side Frame on the machine compartment Note Do not try to remove the Breaker Cover by force without removing the Side Frame or the plastic Breaker Cover may break Breaker Cover Separator Louver 2 Make sure the showcase is unplugged and Side Frame move the Circuit Breaker to the ON position 3 Slide off the Breaker Cover n Cover position the Breaker Cover will hit the Breaker switch and cannot slide Note With the Circuit Breaker in the OFF 4 Remove the Louver Fig 4 Note To prevent the entrance of water the Circuit Breaker is provided with a silicone Waterproof Cover Be careful not to damage it when attaching the Breaker Cover See f WATERPROOF COVER 1 2 74 5270002 e PIPE HOLDER Note The Evaporator Pipes are tightly snapped in TopFrame Pipe Holder the Pipe Holder and should be removed and ADATTA SUE refitted carefully one by one Fe Redd 1 Remove the Evaporator Pipes from the Pipe Evaporator Pipe Holder Evaporator Pipe 1 2 DIA 3 8 DIA x 3 lines 2 Twist the Pipe Holder and remove it from the Top Frame Fig 5 3 To refit the Pipe Holder and Evaporator Pipes reverse the removal procedure 4 Correct the Evaporator Pipes if deformed and in contact with the Top Frame Note The number of Pipe Holders used for each model is as follows MODEL QUANTITY RNC 90A R L 2 RNC 120A R L 2 RNC 150A R L 3 RNC 180A R L 3 RNC 210A R L 4
10. essor must not be opened more than 30 minutes in replacement or service Do not mix lubricants of different compressors even if both are charged with R134a except when they uses the same lubricant 2 Treatment for Refrigerant Leak R134a If a refrigerant leak occurs in the low side of an ice maker charged with R134a air may be drawn in Even if the low side pressure is higher than the atmospheric pressure in normal operation a continuous refrigerant leak will eventually lower the low side pressure below the atmospheric pressure and will cause air suction Air contains a large amount of moisture and ester easily absorbs a lot of moisture If an ice maker charged with R134a has possibly drawn in air the drier must be replaced Be sure to use a drier designed for R134a 3 Handling of Handy Flux R134a Repair of the refrigerant circuit needs brazing It is no problem to use the same handy flux that has been used for the current refrigerants However its entrance into the refrigerant circuit should be avoided as much as possible 4 Cil for Processing of Copper Tubing R134a When processing the copper tubing for service wipe off oil if any used by using alcohol or the like Do not use too much oil and let it into the tubing or wax contained in the oil will clog the capillary tubing 5 Service Parts for R134a Some parts used for refrigerants other than R134a are similar to those for R134a But never use any parts unless they are s
11. ew A Rear 78 3 4 long outside 5 7 8 1 3 8 11 13 16 Evaporator Pipe 1 2 DIA L2 L3 Interior MN CY Na i 5 3 d 13 3 4 mb Air Moder eh Li L2 L3 RNC 90A LA 20 1 16 35 7 16 20 78 RNC 120A LA 31 78 47 14 32 11 16 74MA5270002 5 d RNC 150A LA RNC 180A LA RNC 210A LA Unit inch Power Cord 78 3 4 long 13 16 outside with L shaped Plug L1 N L1 Circuit Breaker gt lt Sliding Glass Door with Handle 3 15 16_ jm Pipe 5 ei SN Md 1346 OD 1346 OD es 47 5 16 V _ Earth Wire 78 3 4 View Rear long outside Air n i B i m e 1 Evaporator Pipe 1 2 DIA tas L3 Interior e e ce Modai esee 3 L2 L3 RNC 150A LA 21 7 16 59 1 16 44 1 2 RNC 180A LA 27 3 8 70 7 8 56 5 16 RNC 210A LA 33 1 4 82 11 16 68 1 8 74MA5270002 4 PERFORMANCE DATA The following is a reference data showing the relationship between the ambient and interior temperatures measured at the center of the interior 60mm above the board Conditions Ambient temperature 30 C 86 F 50 60Hz relative humidity 5096 AC100V Testunits RNC 210A and KN 210G
12. pecified for R134a because their endurance against the refrigerant have not been evaluated Also for R134a do not use any parts that have been used for other refrigerants Otherwise wax and chlorine remaining on the parts may adversely affect R134a 6 Replacement Copper Tubing R134a The copper tubes currently in use are available for R134a But do not use them if oily inside The residual oil in copper tubes should be as little as possible Low residual oil type copper tubes are used in the shipped units 7 Evacuation Vacuum Pump and Refrigerant Charge R134a Never allow the oil in the vacuum pump to flow backward The vacuum level and vacuum pump may be the same as those for the current refrigerants However the rubber hose and gauge manifold to be used for evacuation and refrigerant charge should be exclusively for R134a 8 Refrigerant Leak Check Refrigerant leaks can be detected by charging the unit with a little refrigerant raising the pressure with nitrogen and using an electric detector Do not use air or oxygen instead of nitrogen for this purpose or rise in pressure as well as in temperature may cause R134a to suddenly react with oxygen and explode Be sure to use nitrogen to prevent explosion 16 74 5270002 10 CONSTANT PRESSURE EXPANSION VALVE AND REFRIGERANT CHARGE a SPECIFICATIONS Model HYP2 5QHD 1 3 4 5 Manufacturer Fuji Koki Part Number 447283 01 02 03 04 Refrigerant R134a
13. tacts 5 Correct 6 Motor Protector tripped 6 Ventilate and reset Fan Motor 2 Poor cooling 1 Gas leaks 1 Repair the leaks and recharge performance 2 Fan Motor defective 2 Replace 3 Condenser and or Air Filter 3 Clean clogged 4 Condenser air inlet blocked 4 9 Instruct the user on 5 Exposed to direct sunlight characteristics and proper 6 Located next to a high heat use of the showcase producing equipment 7 Doors opened too frequently or hot foods inside 8 Packed with foods or warm or hot foods inside 9 Ambient temperature exceeding 86 F 3 Foods dry up 1 Foods have been stored from the previous day 2 Foods have been stored for a long time 1 2 Instruct the user on characteristics and proper use of the showcase 4 Exterior or interior sweating 1 Exterior Relative humidity exceeding 60 2 Interior Doors opened too frequently or left open 1 2 Instruct the user on characteristics and proper use of the showcase Wipe off excessive dew with a soft cloth 19 HOSHIZAKI HOSHIZAKI ELECTRIC CO LTD 3 16 MINAMIYAKATA SAKAE TOYOAKE AICHI 470 11 JAPAN PHONE 0562 97 2111
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