Hoshizaki RNC-120A-LA User manual

NO. 74MA-527
ISSUED: FEB. 29, 2000
REVISED:
HOSHIZAKI
COUNTER SHOWCASE
MODEL RNC-A SERIES
(HA)
SERVICE MANUAL

74MA5270002
CONTENTS PAGE
1. FOR SAFETY AND BEST OPERATING RESULTS----------------------------------------- 1
2. SPECIFICATIONS ---------------------------------------------------------------------------------- 2
3.DIMENSIONS ---------------------------------------------------------------------------------------- 3
[a] RNC-90A-RA, RNC-120A-RA---------------------------------------------------------------- 3
[b] RNC-150A-RA, RNC-180A-RA, RNC-210A-RA----------------------------------------- 4
[c] RNC-90A-LA, RNC-120A-LA ---------------------------------------------------------------- 5
[d] RNC-150A-LA, RNC-180A-LA, RNC-210A-LA ------------------------------------------ 6
4. PERFORMANCE DATA --------------------------------------------------------------------------- 7
5.REFRIGERATIONCIRCUIT ----------------------------------------------------------------------- 8
6.WIRINGDIAGRAM ---------------------------------------------------------------------------------- 9
7.CONSTRUCTION ----------------------------------------------------------------------------------10
8. REMOVAL AND REPLACEMENT------------------------------------------------------------- 11
[a] FRONT GLASS AND TOP COVER -------------------------------------------------------11
[b] TOP FRAME ------------------------------------------------------------------------------------12
[c] SEPARATOR AND SIDE FRAME ---------------------------------------------------------12
[d] BREAKER COVER AND LOUVER -------------------------------------------------------12
[e] PIPE HOLDER ---------------------------------------------------------------------------------13
[f] WATERPROOF COVER ---------------------------------------------------------------------13
9.REFRIGERANTSERVICEINFORMATION---------------------------------------------------15
10. CONSTANT PRESSURE EXPANSION VALVE AND REFRIGERANT CHARGE --17
[a]SPECIFICATIONS -----------------------------------------------------------------------------17
[b]FUNCTION---------------------------------------------------------------------------------------17
[c]CONSTRUCTION ------------------------------------------------------------------------------17
[d] REPLACEMENT-------------------------------------------------------------------------------18
11. SERVICE DIAGNOSIS----------------------------------------------------------------------------19

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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
insulationandpoor cooling performancecomparedwith refrigerators ingeneral.
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.

2. SPECIFICATIONS
MODEL RNC-90A-RA
-LA RNC-120A-RA -LA RNC-150A-RA -LA RNC-180A-RA -LA RNC-210A-RA -LA
1 Phase 115-120V 60Hz
2.5A 2.4A 3.1A 3.1A 3.1A
11A 11A 15A 15A 15A
145W 146W 195W 195W 195W
AC SUPPLY VOLTAGE
AMPERAGE
STARTING AMPERAGE
ELECTRIC CONSUMPTION
POWER FACTOR 58% 61% 54% 54% 54%
PULL DOWN TIME (10°C)
SATURATION TEMPERATURE Less than 45 min. (Ambient Temp. 86°F, No Load) 44.6°F (Ambient Temp. 86°F, No Load)
NET CAPACITY 0.85 cu.ft. 1.3 cu.ft. 1.8 cu.ft. 2.3 cu.ft. 2.8 cu.ft.
35-7/16” 47-1/4” 59-1/16” 70-7/8” 82-11/16”
EXTERIOR DIMENSIONS (W)
(D)
(H) 11-13/16”
10-1/4”
20-7/8” 32-11/16” 44-1/2” 56-5/16” 68-1/8”
INTERIOR DIMENSIONS (W)
(D)
(H) 10-1/4”
6-5/16”
EXTERIOR
INTERIOR
INSULATION
Glass, Rigid PVC, ABS Resin
Stainless Steel
Polyurethane Foam
REFRIGERATION SYSTEM
DEFROST SYSTEM Convection Cooling None
Hermetic
75W 75W 130W 130W 130W
Fin and Tube type (Air-cooled), Fan Motor 2P
(UPPER) Bare Tube type, (LOWER) Pipe on Sheet type
Constant Pressure Expansion Valve
R134a
COMPRESSOR OUTPUT
CONDENSER
EVAPORATOR
REFRIGERANT CONTROL
REFRIGERANT
REFRIGERANT CHARGE 4.8 oz. 6.3 oz. 4.6 oz. 6.3 oz. 7.4 oz.
ELECTRIC CIRCUIT PROTECTION
COMPRESSOR PROTECTION Circuit Breaker, Grounding Wire Auto-reset Protector - Compressor
SLIDING DOOR 2 pcs. 2 pcs. 4 pcs. 4 pcs. 4 pcs.
NET WEIGHT 46 lbs. 55 lbs. 66 lbs. 75 lbs. 84 lbs.
2 pcs. 3 pcs. 4 pcs. 5 pcs. 6 pcs.ACCESSORIES BOARD
CAP
VINYL HOSE 2 pcs.
1 pc. (19/32” DIA x 3/4”DIA x 59”)
AMBIENT TEMP.
RELATIVE HUMIDITY
VOLTAGE VARIATION
50 - 86°F
Max. 60%
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.
274MA5270002

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3. DIMENSIONS
[a] RNC-90A-RA, RNC-120A-RA
L1 L2 L3
RNC-90A-RA 20-1/16” 35-7/16” 20-7/8”
RNC-120A-RA 31-7/8” 47-1/4” 32-11/16”
Width
Model
Unit:inch

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[b] RNC-150A-RA, RNC-180A-RA, RNC-210A-RA
L1 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”
Width
Model
Unit:inch

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[c] RNC-90A-LA, RNC-120A-LA
L1 L2 L3
RNC-90A-LA 20-1/16” 35-7/16” 20-7/8”
RNC-120A-LA 31-7/8” 47-1/4” 32-11/16”
Width
Model
Unit:inch

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[d] RNC-150A-LA, RNC-180A-LA, RNC-210A-LA
L1 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”
Width
Model
Unit:inch

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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 50%, AC100V
Testunits: RNC-210A and KN-210G domestic models (+ RNC-120A for reference)
Ambient Temperature [°C (°F)]
Interior Temperature [°C (°F)]
(32) (41) (50) (59) (68) (77) (86) (95)
(50)
(46.4)
(42.8)
(39.2)
(35.6)
(32)
(28.4)
(24.8)
(21.2)
(17.6)

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5. REFRIGERATION CIRCUIT
Refrigerant 134a
Compressor
Condenser
Drier Expansion
Valve
Evaporator
(Upper) Evaporator (Lower)
* The Expansion Valve controls the refrigerant flow rate to stabilize the pressure at the
Evaporator inlet.