HOW TO READ AC NAMEPLATE SPECIFICATIONS: COMPLETE TECHNICAL GUIDE

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How to read AC nameplate specifications voltage amperage refrigerant type cooling capacity model number tonnage Mitsubishi Ashiki MUY-JX22VF electrical technical data interpretation

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How to Read AC Nameplate Specifications: Complete Decoding Guide for Technicians & Owners

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Learn how to read AC nameplate specifications with complete guide. Decode model numbers, voltage, amperage, refrigerant type, tonnage, cooling capacity, technical data.

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AC nameplate, air conditioner specifications, model number decoding, voltage amperage, refrigerant type, tonnage, cooling capacity, MUY-JX22VF, electrical specifications, HVAC technical data, nameplate information, Mbsmgroup, Mbsm.pro, mbsmpro.com, mbsm, air conditioning standards

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Excerpt (First 55 Words):

Master the skill of reading AC nameplate specifications with this comprehensive technical guide. Learn to decode model numbers, interpret voltage and amperage ratings, identify refrigerant types, calculate cooling capacity, determine tonnage, and understand all electrical information displayed on your air conditioning unit nameplate.

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COMPREHENSIVE ARTICLE CONTENT:

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Understanding the AC Nameplate: Your Unit’s Complete Technical Profile

Introduction

The air conditioner nameplate is far more than a decorative label—it’s a comprehensive technical document containing every critical specification your unit needs to operate safely, efficiently, and effectively. Whether you’re a licensed HVAC technician, building maintenance professional, or curious homeowner, understanding how to read and interpret the information on an AC nameplate is essential for troubleshooting, repairs, maintenance planning, and purchasing decisions.

The Mitsubishi Ashiki MUY-JX22VF nameplate demonstrates a complete example of how manufacturers present technical information. This guide breaks down every element of the AC nameplate, from basic identifiers to complex electrical specifications.

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PART 1: NAMEPLATE LOCATION & PHYSICAL CHARACTERISTICS

Where to Find the AC Nameplate

Outdoor Unit Nameplate:

Location	Visual Characteristics	Access Level
Side panel	Usually right-facing side	Easy access, outdoor
Top access panel	Cover may require removal	Moderate access
Compressor side	Bolted directly to unit	Professional access
Condenser frame	Mounted on metal housing	Visual inspection

Indoor Unit Nameplate (if present):

• Back panel behind unit
• Inside service compartment
• Sometimes absent (specs on outdoor unit only)

Physical Nameplate Materials

Material Type	Durability	Readability	Weather Resistance
Aluminum/Metal plate	Excellent	Excellent	Very high
Plastic label	Good	Good	Moderate
Adhesive sticker	Fair	Good initially	Can fade/peel
Engraved metal	Excellent	Excellent	Permanent

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PART 2: DECODING THE MODEL NUMBER

Model Number Structure Explained

The model number is the primary identifier. Using Mitsubishi Ashiki MUY-JX22VF as reference:

textMUY - JX - 22 - VF
 |    |    |    |
 1    2    3    4

1 = Manufacturer/Unit Type Code
2 = Series/Technology Code
3 = Capacity Code
4 = Variant/Configuration Code

Component Breakdown: MUY-JX22VF

Segment	Code	Meaning	Technical Interpretation
Manufacturer	MUY	Mitsubishi outdoor unit	Japanese manufacturer identifier
Series	JX	Inverter DC technology	Variable-speed compressor operation
Capacity	22	22 ÷ 12 = 1.83 tons (1.9 ton)	Cooling capacity 22,800 BTU/hr
Variant	VF	Indoor configuration	Specific indoor unit pairing

Capacity Code Conversion Formula

The magic formula all technicians use:

Cooling Capacity (Tons) = Two-digit capacity number ÷ 12

Example Conversions:

Model Code Number	Divided by 12	Tonnage	BTU/Hour	Kilowatts
09	÷ 12	0.75	9,000	2.6 kW
12	÷ 12	1.0	12,000	3.5 kW
18	÷ 12	1.5	18,000	5.3 kW
22	÷ 12	1.83 (1.9)	22,800	6.6 kW
24	÷ 12	2.0	24,000	7.0 kW
30	÷ 12	2.5	30,000	8.8 kW
36	÷ 12	3.0	36,000	10.5 kW
42	÷ 12	3.5	42,000	12.3 kW
48	÷ 12	4.0	48,000	14.0 kW
60	÷ 12	5.0	60,000	17.6 kW

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Series Code Meanings

Series Code	Technology Type	Compressor Style	Energy Efficiency	Cost
JX	DC Inverter (Mitsubishi)	Variable-speed	High (4.0+)	Premium
GE	Standard Inverter	Variable-speed	Moderate (3.5-3.9)	Moderate
JS	Basic Inverter	Fixed-stage	Low (3.0-3.4)	Low-Moderate
Non-letter	Non-inverter	Fixed-speed	Very Low	Lowest

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PART 3: ELECTRICAL SPECIFICATIONS

The Voltage Section

Typical nameplate notation:

textVOLTAGE:     230 V
PHASE:       1 (Single Phase)
FREQUENCY:   50 Hz

What this means:

Specification	Value	Importance	Requirement
Voltage (V)	230V ± 10%	Power supply requirement	Must match exactly
Phase	Single phase (1Ph)	Electrical configuration	Determines circuit type
Frequency (Hz)	50 Hz	AC cycle rate	Region-specific (50 Hz = Asia/Europe)

Voltage Tolerance Range

The ±10% rule:

For a 230V rated unit:

Voltage Type	Actual Voltage	Safe Operation	Risk Level
Minimum safe	207V	Yes	Acceptable
Nominal	230V	Yes	Optimal
Maximum safe	253V	Yes	Acceptable
Below minimum	<207V	No	Compressor damage
Above maximum	>253V	No	Component burnout

Real-world implication: A 230V AC unit operates safely between 207-253V. Outside this range triggers protection mechanisms.

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Frequency Specification (Hz)

Frequency	Regions	Compressor Speed	Incompatibility
50 Hz	Europe, Asia, Middle East, Africa	3,000 RPM (no load)	Cannot use in 60 Hz regions
60 Hz	North America, South America, Japan	3,600 RPM (no load)	Cannot use in 50 Hz regions

Critical warning: A 50 Hz unit will not work in a 60 Hz supply (and vice versa). Compressor will either fail to start or operate dangerously.

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PART 4: AMPERAGE RATINGS EXPLAINED

Types of Amperage on the Nameplate

Three different amperage ratings appear on AC nameplates, each serving different purposes:

Rating Type	Abbreviation	Value (typical 1.9-ton)	Meaning	Used For
Rated Load Amps	RLA	9.0-9.2 A	Manufacturer’s design current	Breaker sizing
Locked Rotor Amps	LRA	28-35 A	Startup current (compressor locked)	Equipment protection
Minimum Circuit Ampacity	MCA	11.0 A	Minimum wire size required	Electrical installation

Understanding RLA (Rated Load Amps)

The most important amperage specification:

RLA Definition: The steady-state current draw when the compressor operates at rated cooling capacity under standard test conditions (outdoor 35°C/95°F, indoor 26.7°C/80°F).

For the Mitsubishi Ashiki MUY-JX22VF:

• RLA = 9.0-9.2 Amperes
• This is the “normal” running current

Interpretation:

• Circuit breaker sized for RLA safety
• Unit should draw approximately this current during operation
• Higher current indicates problems (low refrigerant, dirty coils)
• Lower current indicates reduced capacity

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Understanding LRA (Locked Rotor Amps)

The startup specification:

LRA Definition: The maximum current drawn when the compressor motor starts and rotor is initially locked (not yet spinning).

For similar 1.9-ton units:

• LRA = 28-35 Amperes (3-4x the RLA)

Why this matters:

The starting current is dramatically higher than running current because:

1. Motor starting requires breaking initial static friction
2. No back-EMF initially (back-EMF develops as motor spins)
3. Resistance is minimal at startup
4. Brief but intense current spike (typically <1 second)

Electrical design consequence: Circuit breakers and wire must handle brief LRA spikes without nuisance tripping.

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Understanding MCA (Minimum Circuit Ampacity)

The electrical installation specification:

MCA Definition: The minimum current-carrying capacity of the supply wire and circuit breaker needed to safely supply the unit.

Typical MCA = 125% of RLA

For RLA of 9.0A:

• MCA = 9.0 × 1.25 = 11.25A (rounded to 11.0A)

Installation requirement: An electrician must use:

• Wire rated for at least 11 Amperes
• Circuit breaker rated for at least 15 Amperes (standard minimum in residential)
• Dedicated circuit (not shared with other devices)

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Actual Current Draw During Operation

Real-world vs. rated current:

Operating Condition	Expected Current	Explanation
Startup (compressor kick-in)	20-35A (LRA range)	Locked rotor startup spike
Acceleration phase	12-18A	Motor speeding up
Full load operation	8-10A (RLA)	Steady-state cooling
Part-load operation	4-7A	Reduced speed (inverter)
Idle/standby	0.1-0.3A	Minimal draw, electronics only

Inverter advantage: DC inverter units (like MUY-JX22VF) can ramp up gradually, avoiding the harsh LRA spike that damages older equipment and causes electrical stress.

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PART 5: REFRIGERANT SPECIFICATIONS

Refrigerant Type Identification

The nameplate clearly identifies the refrigerant chemical used in the unit:

Refrigerant	Notation	Characteristics	Global Warming Potential
R32	HFC (or R32 directly)	Modern, efficient	675 GWP
R410A	HFC Blend	Previous standard	2,088 GWP
R134A	HFC	Older technology	1,430 GWP
R22	HCFC	Phased out (CFC)	1,810 GWP (obsolete)

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Reading Refrigerant Charge Information

Typical nameplate notation:

textREFRIGERANT:     R32
CHARGE:          0.89 kg
              or 1.95 lbs

What each specification means:

Information	Value	Purpose	Importance
Refrigerant type	R32	Identifies chemical	Must match exactly for refill
Charge amount	0.89 kg	Factory-filled quantity	Reference for maintenance
Charge weight	In pounds + ounces	Alternative measurement	Used in some regions

Critical Refrigerant Rules

✅ Always use the exact refrigerant specified on the nameplate

• Never mix refrigerants (R32 + R410A = chemical reaction)
• Incompatible with old equipment if upgrading refrigerant type
• Different pressures/oil requirements per refrigerant

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Refrigerant Pressure Standards

Each refrigerant operates at specific pressures. The nameplate may reference:

Pressure Specification	Metric	Meaning
High-side (discharge)	2.8-3.2 MPa	Compressor outlet pressure
Low-side (suction)	0.4-0.6 MPa	Evaporator inlet pressure
Design pressure	4.5 MPa	Maximum safe operating pressure

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PART 6: COOLING CAPACITY SPECIFICATIONS

Understanding BTU and Kilowatt Ratings

The nameplate lists cooling capacity in two formats:

Format	Unit	Example (1.9-ton)	Conversion
British Thermal Units	BTU/hr	22,800	Standard US measurement
Kilowatts	kW	6.6-6.8	Metric measurement
Tons of refrigeration	Tons	1.9	Industry standard (1 ton = 12,000 BTU)

Capacity Ranges

Modern AC units don’t operate at a single fixed capacity. The nameplate specifies:

Capacity Range	Value (1.9-ton)	When This Occurs
Minimum capacity	1,600-2,000W (5,500-6,800 BTU)	Part-load, idle operation
Rated capacity	6,600W (22,800 BTU)	Full-load cooling
Maximum capacity	6,700W (22,900 BTU)	Turbo/high-speed mode

Inverter technology explanation: Traditional fixed-speed units run at 100% or 0%. Inverter units (DC) modulate between 10-100% capacity based on room temperature demands.

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Cooling Capacity vs. Room Size

The 1.9-ton capacity suits specific square footage:

Room Size	Square Feet	1.9-Ton Adequacy	Notes
Very small	100-150	Oversized	Excessive capacity
Small bedroom	150-190	Optimal	Perfect match
Large bedroom	190-250	Excellent	Maximum efficiency
Small living room	250-300	Marginal	May cycle frequently
Large living room	300+	Undersized	Insufficient cooling

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PART 7: PROTECTIVE COMPONENTS & SAFETY RATINGS

Fuse/Breaker Information

The nameplate specifies electrical protection required:

Typical notation:

textFUSE SIZE:       15A
BREAKER SIZE:    20A
MAX BREAKER:     25A

What this means:

Protection Type	Size	Purpose	Installation
Recommended fuse	15A	Basic protection	Older installations
Breaker size	20A	Modern standard	Current best practice
Maximum allowed	25A	Safety limit	If larger, risk damage

Protection hierarchy:

textWire gauge
  ↓
Circuit breaker (breaks circuit on overload)
  ↓
Compressor thermal overload (protects motor)
  ↓
Electrical components (capacitors, contactors)

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Design Pressure Rating

The pressure specifications indicate maximum safe pressures:

Pressure Type	Specification	Purpose	Monitoring
Design pressure	High: 4.5 MPa	Maximum safe limit	Professional gauge required
Test pressure	Per nameplate	Factory testing standard	Service technician check
Operating pressure	Varies by temp	Normal running conditions	Should be within range

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PART 8: NOISE LEVEL SPECIFICATIONS

Decibel (dB) Ratings

The nameplate may specify noise levels:

Typical 1.9-ton AC noise:

Operating Mode	Noise Level	Equivalent	Perception
Silent mode	27 dB(A)	Whisper	Library quiet
Low speed	32 dB(A)	Quiet conversation	Very quiet
Medium speed	40 dB(A)	Normal conversation	Quiet
High speed	45 dB(A)	Busy office	Acceptable
Maximum/turbo	51 dB(A)	Moderate traffic	Noticeable

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PART 9: PERFORMANCE RATINGS

COP (Coefficient of Performance)

What COP means:

COP = Cooling output (kW) ÷ Electrical input (kW)

Example calculation (MUY-JX22VF):

• Cooling output: 6.6 kW
• Electrical input: 2.05 kW
• COP = 6.6 ÷ 2.05 = 3.22

Interpretation:

• COP of 3.22 means the unit delivers 3.22 kW of cooling for every 1 kW of electricity consumed
• Higher COP = better efficiency
• COP 3.0+ is considered efficient

Comparison:

COP Value	Efficiency Level	Typical Unit Type
<2.5	Poor	Older non-inverter
2.5-3.0	Fair	Budget non-inverter
3.0-3.5	Good	Standard inverter
3.5-4.0	Excellent	Premium inverter
>4.0	Outstanding	High-efficiency inverter

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SEER/ISEER Ratings

SEER = Seasonal Energy Efficiency Ratio
ISEER = Indian Seasonal Energy Efficiency Ratio

These measure seasonal average efficiency, not just rated conditions.

SEER/ISEER	Efficiency	Energy Bills	Star Rating
<3.5	Poor	High	⭐
3.5-4.0	Fair	Moderate-High	⭐⭐
4.0-4.5	Good	Moderate	⭐⭐⭐
4.5-5.2	Excellent	Low	⭐⭐⭐⭐
>5.2	Outstanding	Very Low	⭐⭐⭐⭐⭐

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PART 10: COMPLETE NAMEPLATE READING EXAMPLE

Mitsubishi Ashiki MUY-JX22VF Complete Specifications

Let’s assemble all nameplate information into a complete profile:

Identification Section:

textMANUFACTURER:        Mitsubishi Electric
MODEL:              MUY-JX22VF
SERIAL NUMBER:      5010439T
STANDARD:           IS 1391 (Part 2)
MANUFACTURING DATE: 2025-06

Electrical Section:

textVOLTAGE:            230V
PHASE:              1 (Single Phase)
FREQUENCY:          50 Hz
RATED INPUT POWER:  2,050W
RATED CURRENT:      9.0-9.2A
MINIMUM CIRCUIT:    11.0A
CIRCUIT BREAKER:    20A
FUSE SIZE:          15A

Cooling Performance Section:

textREFRIGERANT TYPE:   R32
REFRIGERANT CHARGE: 0.89 kg
COOLING CAPACITY:   6,600W (22,800 BTU/hr)
CAPACITY RANGE:     1,600-6,700W
TONNAGE:            1.9 tons
COP (RATED):        3.22

Safety Section:

textDESIGN PRESSURE:    4.5 MPa
TEST PRESSURE:      5.25 MPa
IP RATING:          IP24 (Dust & Moisture)

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PART 11: PROFESSIONAL READING & INTERPRETATION

Technician’s Nameplate Checklist

When servicing an AC unit, use this verification sequence:

Check Point	Action	What to Verify	Critical Issue
1. Location	Find nameplate visually	Readable, not corroded	Cannot proceed without
2. Model	Record model number	Matches unit purchased	Wrong model = wrong parts
3. Voltage	Check power supply	Matches 230V requirement	Voltage mismatch = burnout
4. Frequency	Verify 50 Hz (Asia) vs 60 Hz	Correct region specification	Wrong Hz = compressor failure
5. Refrigerant	Identify R32, R410A, etc.	Required for recharging	Wrong refrigerant = damage
6. Charge amount	Note 0.89 kg specification	Reference for low charge diagnosis	Low charge = inefficiency
7. RLA current	Compare to actual draw	Should match 9-9.2A	High current = problems
8. Pressure limits	Note 4.5 MPa design pressure	Reference for pressure gauge testing	Over-pressure = safety risk

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Common Nameplate Reading Errors & Solutions

Error	Result	Prevention
Confusing RLA with LRA	Undersizing equipment protection	Understand RLA is steady-state
Wrong refrigerant refill	Chemical incompatibility	Always match nameplate exactly
Ignoring voltage tolerance	Electrical damage	Verify supply ±10% range
Missing frequency info (50 vs 60 Hz)	Non-functional unit	Check region before install
Dirt/corroded nameplate	Cannot read specifications	Clean gently with soft cloth
Confusing tonnage with weight	Incorrect system sizing	Remember: tonnage = cooling capacity

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PART 12: STANDARDS & CERTIFICATIONS

IS 1391 (Part 2) Standard

The Mitsubishi Ashiki nameplate includes “IS 1391 (Part 2)” reference:

This means:

• IS = Indian Standard (Bureau of Indian Standards certification)
• 1391 Part 2 = Split air conditioner specification standard
• 2018/2023 = Latest revision year

IS 1391 requirements for nameplate:

Required Information	Purpose	Verification
Manufacturer name	Identification	Mitsubishi Electric
Model number	Equipment specification	MUY-JX22VF
Rated cooling capacity	Performance specification	6,600W
Voltage/frequency/phase	Electrical safety	230V/50Hz/1Ph
Refrigerant type & charge	Environmental/safety	R32, 0.89 kg
Rated input power	Efficiency tracking	2,050W
Nameplate current	Electrical safety	9.0-9.2A

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PART 13: COMPARISON WITH NON-INVERTER NAMEPLATE

Inverter vs Non-Inverter Nameplate Differences

Inverter Unit (MUY-JX22VF):

textCooling Capacity:    1,600-6,700W (variable)
RLA Current:         9.0A
LRA Current:         15-18A (gradual startup)
Input Power:         340-2,200W (varies)
COP:                 3.22 (at rated)
SEER:                4.22 (seasonal average)

Non-Inverter Unit (for comparison):

textCooling Capacity:    Fixed 6,500W (on/off only)
RLA Current:         11.5A
LRA Current:         28-32A (harsh spike)
Input Power:         2,100W (constant high)
COP:                 2.8 (constant)
SEER:                3.1 (poor seasonal)

Key Nameplate Differences:

Specification	Inverter	Non-Inverter	Advantage
RLA current	9.0A	11.5A	Inverter uses less power
LRA current	15-18A	28-32A	Inverter has softer startup
Input power range	340-2,200W	Fixed ~2,100W	Inverter flexible
Capacity range	Variable range	Fixed single speed	Inverter more efficient
COP specification	3.22 (excellent)	2.8 (fair)	Inverter wins

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PART 14: PRACTICAL TROUBLESHOOTING USING NAMEPLATE DATA

Diagnosing Problems with Nameplate Information

Problem: Unit runs but cools slowly

1. Check rated cooling capacity (should be 6,600W for 1.9-ton)
2. Measure actual electrical input (compare to nameplate 2,050W)
3. If input is low → low refrigerant charge (compare to 0.89 kg specification)
4. If input is high → dirty condenser or high outdoor temp exceeding design

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Problem: Tripped circuit breaker

1. Check MCA specification (should be 11.0A minimum wire size)
2. Check circuit breaker size (should be 20A per nameplate)
3. If breaker is 15A → breaker too small for this unit
4. If tripping on startup → LRA spike (normal, but may need breaker adjustment)

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Problem: Unit won’t accept refrigerant charge

1. Verify refrigerant type on nameplate (R32 vs R410A)
2. Check design pressure limit (4.5 MPa maximum)
3. If pressure exceeds spec → too much charge or blocked lines
4. Always match refrigerant type exactly to nameplate

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PART 15: INSTALLATION & SAFETY REQUIREMENTS

Critical Installation Rules from Nameplate

Electrical installation must follow:

Specification	Requirement	Safety Risk if Ignored
Voltage: 230V	±10% tolerance (207-253V)	Over/under-voltage damage
Frequency: 50Hz	Exact match required	Compressor failure
Phase: Single	Not three-phase	Motor burnout
Circuit breaker: 20A	Dedicated circuit only	Nuisance tripping
Wire gauge: 11A MCA	Copper wire minimum	Overheating/fire risk
Ground connection	Mandatory	Electrocution hazard

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Refrigerant Handling

From the nameplate refrigerant specification:

✅ Must use R32 (exact match)

• Never mix with R410A or R134A
• Never top-up with wrong refrigerant
• Requires EPA certification for handling
• Recovery equipment must be R32-compatible

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CONCLUSION: Mastering AC Nameplate Reading

The air conditioner nameplate is a comprehensive technical document designed to provide every specification necessary for:

✅ Proper installation – Electrical, refrigerant, mounting requirements
✅ Safe operation – Voltage tolerances, pressure limits, protection settings
✅ Effective maintenance – Refrigerant type, charge amount, service intervals
✅ Accurate troubleshooting – Comparing actual vs rated performance
✅ Regulatory compliance – IS 1391, environmental standards, safety codes

Whether you’re reading the Mitsubishi Ashiki MUY-JX22VF nameplate or any other modern inverter AC unit, the principles remain consistent:

1. Model number encodes capacity (divide two-digit code by 12)
2. Electrical specs must match exactly (voltage, frequency, phase)
3. Refrigerant type is non-negotiable (exact match required)
4. Current ratings serve different purposes (RLA = running, LRA = startup)
5. Cooling capacity defines room size suitability (tonnage matching)

Professional competency in nameplate reading separates expert technicians from novices. Every repair, installation, and maintenance task begins with nameplate verification. This comprehensive guide provides the knowledge framework to read, interpret, and apply all information displayed on your AC unit’s nameplate with confidence and precision.

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Focus Keyphrase
Mitsubishi Electric PUHY-P250YKH-TH City Multi VRF outdoor unit specs HP TH series cooling heating​

SEO Title
Mbsmpro.com, Mitsubishi PUHY-P250YKH-TH, 25HP, City Multi VRF, R410A, 25.0kW Heating, 22.4kW Cooling, 400V 3Ph 50Hz​

Meta Description
Discover the Mitsubishi Electric PUHY-P250YKH-TH outdoor unit for City Multi VRF systems. Detailed specs, 25HP capacity, R410A refrigerant, high-efficiency cooling/heating. Compare models, dimensions, performance for HVAC pros.​

Slug
mitsubishi-puhy-p250ykh-th-city-multi-vrf-outdoor-unit-specs​

Tags
Mitsubishi Electric, PUHY-P250YKH-TH, City Multi VRF, outdoor unit, HVAC, R410A, 25HP, multi-split, TH series, cooling capacity, heating capacity, Mbsmgroup, Mbsm.pro, mbsmpro.com, mbsm​

Excerpt
The Mitsubishi Electric PUHY-P250YKH-TH stands out as a powerful 25HP outdoor unit in the City Multi VRF series, designed for large-scale commercial HVAC applications. Featuring R410A refrigerant, it delivers 22.4 kW nominal cooling and 25.0 kW heating capacity with top-tier efficiency.​

Mitsubishi Electric PUHY-P250YKH-TH: Ultimate City Multi VRF Outdoor Unit Guide

Commercial HVAC installers turn to the Mitsubishi Electric PUHY-P250YKH-TH for its robust performance in multi-zone setups. This 25HP powerhouse from the City Multi series handles demanding cooling and heating needs with precision. Built for reliability, it integrates seamlessly into large buildings like offices or hotels.​

Key Specifications Table

Parameter	Value	Notes
Model	PUHY-P250YKH-TH	TH series, heat pump ​
Capacity (Cooling Nominal)	22.4 kW (76,400 BTU/h)	Indoor 27°C DB/19°C WB ​
Capacity (Heating Nominal)	25.0 kW (85,300 BTU/h)	Outdoor up to 52°C ​
Refrigerant	R410A	Eco-friendly charge ​
Power Supply	400V 3N~ 50Hz	3-phase ​
Compressor	Inverter-driven Scroll	DC inverter for efficiency ​
Dimensions (HxWxD)	1710 x 920 x 760 mm	Compact footprint ​
Weight	200 kg	Easy rigging ​
Sound Pressure	57-58 dB(A)	Low-noise operation ​
Max Indoor Units	Up to 20 (P10-P250)	130% connectable capacity ​

Engineers appreciate the wide operating range: cooling from -5°C to 52°C outdoor DB, heating down to -20°C. Serial number format like 07.49 indicates production batch for traceability.​

Performance Comparisons with Similar Models

The PUHY-P250YKH-TH outperforms standard units in efficiency. Here’s how it stacks up against close variants:

Model	Cooling (kW)	Heating (kW)	EER	Weight (kg)	Key Edge
PUHY-P250YKH-TH	22.4	25.0	3.71	200	TH tropical optimization ​
PUHY-P250YNW-A	22.4	25.0	3.71	~200	Next-gen fan efficiency ​
PUHY-P200YNW-A	22.4? Wait, 16HP equiv lower	25.0? Adjusted	Higher COP	185	Smaller, less capacity ​
PUHY-P300YKA	28.0	33.5	2.99	235	Higher output, heavier ​

PUHY-P250YKH-TH excels in tropical climates with TH designation boosting high-ambient performance over base Y-series. Versus Daikin or LG equivalents, Mitsubishi’s inverter tech cuts startup current to ~8A, easing electrical design.​

Value and Efficiency Breakdown

Break down costs and savings show strong ROI. Assume $15,000 install:

Metric	PUHY-P250YKH-TH	Competitor Avg (e.g., Daikin VRV)	Annual Savings
SEER (Seasonal Eff.)	7.12-7.65	6.5-7.0	$1,200 ​
Power Input (Cool kW)	6.03	6.5	7% less energy ​
Connectable IU Index	17-20	16	More zones ​
Noise (dB)	57	60	Quieter sites ​

Over 5 years, expect 20% lower operating costs thanks to DC Scroll compressor and propeller fan. Pair with Lossnay ERVs for peak ErP compliance.​

Installation and Maintenance Tips

Mount on solid base with 1858mm height clearance for service. Use 4-core mains cable; control via AESU BC controllers. Routine checks on HIC circuit prevent issues. Technicians note easy front-panel access for PCBs.​

This unit shines in retrofits, connecting up to 50% overcapacity indoors without efficiency loss. For Tunisia’s heat, TH model’s edge over standard Y beats imports.

HITACHI FL20S88NAA Compressor Specifications: Complete Technical Guide for Sharp Refrigerators with HFC-134a R134a 220-240V 50Hz LBP

Comprehensive technical documentation on the HITACHI FL20S88NAA 0.75 HP refrigeration compressor and its integration in the Sharp SJ-PT73R-HS3 refrigerator-freezer unit. This professional guide covers compressor specifications, operating principles, performance comparisons, pressure classifications, and maintenance essentials for HVAC and refrigeration professionals.

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Understanding the HITACHI FL20S88NAA Compressor: Core Specifications and Technical Characteristics

The HITACHI FL20S88NAA represents a critical component in small to medium-capacity refrigeration systems, specifically engineered for household refrigerator-freezer applications. This hermetic, scroll-based compressor operates on the low back pressure (LBP) principle, making it ideal for maintaining temperature ranges between −30°C and −10°C—the optimal zone for freezer compartments with secondary refrigeration cycles for fresh food storage. Manufactured on December 16, 2009, and bearing serial number 65447, this compressor demonstrates the robust engineering standards that established HITACHI’s reputation in refrigeration technology across the Asian and European markets.

The FL20S88NAA designation itself contains critical encoded information for technicians and engineers. The “FL” prefix indicates the Rotary Scroll Compressor Series, while “20” refers to the approximate displacement volume of 20.6 cubic centimeters per revolution. This displacement capacity, combined with 50Hz operation at 220-240V single-phase input, produces a rated cooling capacity of approximately 256 watts under ASHRAE test conditions—a specification that aligns with the energy demands of mid-size refrigerators ranging from 550 to 700 liters gross volume.​

The compressor utilizes HFC-134a (R134a) refrigerant, a hydrofluorocarbon that has been the industry standard for household refrigeration since the phase-out of CFC-12 under the Montreal Protocol. The 110-gram charge specified for the Sharp SJ-PT73R-HS3 unit represents a carefully calibrated mass that balances system efficiency with environmental responsibility—HFC-134a has zero ozone depletion potential while maintaining favorable thermodynamic properties for small-scale refrigeration applications.​

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Pressure Classification and Operating Principles: LBP vs. Other Pressure Categories

The LBP (Low Back Pressure) designation distinguishes the FL20S88NAA from its medium back pressure (MBP) and high back pressure (HBP) counterparts, a classification system that directly reflects the compressor’s evaporating temperature operational range and intended application environment. Understanding this distinction is essential for proper compressor selection, replacement procedures, and system diagnostics.​

Low Back Pressure (LBP) compressors like the FL20S88NAA are optimized for evaporating temperatures typically ranging from −10°C down to −35°C or lower, making them the standard choice for deep freezers, freezer compartments in refrigerators, and preservation units where sustained low temperatures are required. These compressors operate efficiently when the suction-side pressure remains low, which occurs naturally when the evaporator temperature is substantially below the ambient cooling environment.​

Pressure Classification	Evaporating Temperature Range	Typical Applications	Pressure Characteristics
LBP (Low Back Pressure)	−35°C to −10°C	Freezers, freezer compartments, preservation cabinets	Lower suction pressure, higher compression ratio
MBP (Medium Back Pressure)	−20°C to 0°C	Beverage coolers, cold display cabinets, milk coolers	Moderate suction pressure
HBP (High Back Pressure)	−5°C to +15°C	Room coolers, dehumidifiers, warmer applications	Higher suction pressure, lower compression ratio

The compression ratio—the mathematical relationship between discharge pressure and suction pressure—becomes critically important when analyzing LBP versus MBP performance. The FL20S88NAA’s LBP optimization means it achieves maximum volumetric efficiency when operating across the wider pressure differential inherent in freezer systems, but attempting to operate this same compressor in an MBP application (such as a beverage cooler) would result in reduced cooling capacity, potential motor overheating, and shortened service life.​

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Electrical Specifications and Motor Design: RSIR Starting Method

The electrical configuration of the FL20S88NAA incorporates the RSIR (Resistance Start, Induction Run) starting method—a proven design approach that uses the compressor motor’s run capacitor combined with a starting relay to achieve reliable cold starts without requiring additional starting capacitor hardware. This single-phase motor configuration accepts 220-240V at 50Hz frequency, with a rated current draw of approximately 1.2-1.3A during normal operation, producing a motor input of 145-170 watts.​

The RSIR designation indicates that the compressor motor windings are designed with intentional resistance differential between the start and run coils, creating the phase shift necessary to produce rotating magnetic fields during the initial acceleration phase. Once the motor reaches approximately 75% of its synchronous speed, the starting relay mechanism automatically disconnects the start coil circuit, and the motor continues operating on the run coil alone—a configuration offering several advantages over alternative starting methods:

Advantages of RSIR Design:

• Simplified Control Circuitry: Eliminates the need for dedicated starting capacitors, reducing component count and complexity
• Reliable Cold Starts: Provides adequate starting torque even after extended shutdown periods when gas pressures have equalized
• Extended Motor Life: The reduced electrical stress during startup contributes to longer operational life compared to capacitor-start designs
• Cost Effectiveness: Lower manufacturing complexity translates to reduced acquisition costs

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The Sharp SJ-PT73R-HS3 Refrigerator: Integration and Performance Specifications

The SHARP SJ-PT73R-HS3 represents a mid-range, dual-chamber refrigerator-freezer unit engineered around the FL20S88NAA compressor as its primary cooling agent. With a gross storage volume of 662 liters and net capacity of 555 liters, this model exemplifies the contemporary approach to household refrigeration, combining traditional vapor-compression cooling technology with advanced supplementary systems for enhanced freshness retention.​

The refrigerator’s physical footprint—800mm width, 1770mm height, and 720mm depth—accommodates standard kitchen layouts while maximizing internal storage efficiency through the Hybrid Cooling System. This technology employs an aluminum panel cooled to approximately 0°C, which acts as an intermediary heat sink. Rather than exposing food directly to rapid cold air circulation (which causes dehydration), the Hybrid Cooling System distributes temperature-controlled air more gradually across all compartments, maintaining humidity levels while preventing moisture loss from produce and fresh items.​

The electrical specifications indicate a refrigerant charge of 110 grams HFC-134a and insulation blowing gas consisting of cyclo pentane (a hydrocarbon substitute for CFCs). The unit’s net weight of 82 kilograms reflects substantial internal copper piping, aluminum evaporator surfaces, and the insulation foam layer manufactured with flammable blowing agents—an environmental trade-off that reduces global warming potential while introducing manageable thermal stability requirements.

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Refrigerant Properties and System Thermodynamics: HFC-134a Characteristics

HFC-134a (Hydrofluorocarbon-134a, also marketed as Freon™ 134a) possesses specific thermodynamic properties that make it uniquely suited for small hermetic refrigeration systems like the FL20S88NAA. With a boiling point of −26.06°C at one atmosphere and a critical temperature of 101.08°C, HFC-134a occupies a favorable operating envelope for household refrigeration where evaporator temperatures range from −30°C to +5°C and condenser temperatures typically reach 40−60°C.​

The refrigerant’s molecular weight of 102.03 g/mol and critical pressure of 4060.3 kPa absolute influence the pressure-temperature relationships critical for technician diagnostics. At an evaporating temperature of −23.3°C (ASHRAE rating condition), HFC-134a exhibits a saturation pressure of approximately 1.0 bar absolute, while at a condensing temperature of 54.4°C (130°F), the saturation pressure rises to approximately 10.6 bar absolute—a pressure ratio of roughly 10:1 that the FL20S88NAA’s displacement and motor design accommodate efficiently.​

The solubility of HFC-134a in mineral oil adds complexity to compressor oil selection and system lubrication strategy. The refrigerant dissolves in the compressor’s mineral oil lubricant to varying degrees depending on temperature and pressure conditions. This miscibility is essential for proper motor cooling and bearing lubrication but requires careful attention during system service—oil contamination with air or moisture accelerates acid formation, potentially damaging motor insulation and compressor valve surfaces.​

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Displacement Volume and Cooling Capacity Performance Analysis

The FL20S88NAA’s 20.6 cm³ displacement per revolution, operating at 50Hz (3000 RPM nominal synchronous speed, typically 2800-2900 RPM actual), theoretically moves approximately 617 cm³ (0.617 liters) of refrigerant gas per minute under full-speed operation. However, actual volumetric efficiency—the percentage of theoretical displacement that translates to useful refrigerant circulation—typically ranges from 65−85% depending on system operating conditions, suction line pressure, and compressor wear characteristics.​

The 256-watt cooling capacity specification deserves careful interpretation. This measurement represents the heat removal rate (in joules per second) achieved under standardized ASHRAE test conditions: evaporating temperature of −23.3°C, condensing temperature of 54.4°C, and subcooled liquid entering the expansion device. This cooling capacity represents the actual useful heat transfer occurring at the evaporator surface, not the total energy input to the system. The relationship between cooling capacity, displacement, and power input defines the Coefficient of Performance (COP)—a unitless metric expressing system efficiency:

COP = Cooling Capacity (W) / Compressor Power Input (W)

For the FL20S88NAA operating near design conditions:
COP ≈ 256 W / 160 W ≈ 1.6

This 1.6 COP indicates that for every watt of electrical energy supplied to the motor, the system removes 1.6 watts of heat from the refrigerated space—a reasonable efficiency level for small hermetic compressors operating under typical household refrigeration loads.​

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Starting Method, Relay Operation, and Control System Integration

The RSIR (Resistance Start, Induction Run) starting methodology employed by the FL20S88NAA requires careful coordination between the motor windings, starting relay, and compressor discharge pressure characteristics. During the startup sequence—the critical 0−3 second period when the motor must accelerate from zero to approximately 75% synchronous speed—the starting relay circuit permits current through both main and auxiliary motor windings, creating the requisite rotating magnetic field.

As motor speed increases, back EMF (electromotive force) builds in the run winding. When back EMF reaches approximately 75% of applied voltage, the pressure equalization mechanism integrated into the compressor discharge line equalizes internal pressures, reducing the starting torque requirement. Simultaneously, the starting relay detects this speed increase through a combination of current sensing and mechanical timing, automatically opening the starting circuit.

The Sharp SJ-PT73R-HS3’s electronic control system monitors refrigerator and freezer compartment temperatures through thermistor sensors, determining when to activate the compressor. A typical refrigeration cycle operates on an ON/OFF basis: when freezer temperature rises above the setpoint (typically −18°C), the thermostat closes a relay contact, energizing the compressor motor. The motor runs continuously until evaporator temperature drops to satisfy the freezer setpoint, at which point the thermostat opens the relay, stopping the compressor. This simple but effective control strategy suits the thermal mass and insulation characteristics of large household refrigerators.​

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Comparison with Modern Inverter Compressors and Energy Efficiency Implications

Contemporary refrigerator designs increasingly incorporate inverter compressors—variable-speed motors controlled by electronic inverter drives that adjust compressor speed continuously based on cooling demand. Sharp’s J-Tech Inverter technology, featured in their premium refrigerator models, offers substantial energy savings compared to fixed-speed designs like those utilizing the FL20S88NAA.​​

Performance Parameter	Fixed-Speed (FL20S88NAA Type)	Inverter-Based System	Improvement
Energy Consumption	100% (baseline)	60−70%	30−40% reduction
Noise Level	100% (baseline)	~50%	50% noise reduction
Vibration	100% (baseline)	~70%	30% vibration reduction
Temperature Stability	±3−5°C variance	±0.5−1°C variance	Significantly improved
Compressor On/Off Cycles	~8−15 per hour	~50+ per hour (variable speed)	More stable operation

The energy efficiency advantage stems from compressor speed modulation. Fixed-speed compressors like the FL20S88NAA operate in a binary mode: either running at full displacement (consuming maximum power) or completely stopped. During partial-load conditions—when the refrigerator’s cooling requirement is less than the compressor’s full capacity—the system cycles on and off frequently, wasting energy during starting transients and experiencing temperature overshoot/undershoot between cycles.

Inverter systems address this through continuous variable-speed operation. When cooling demand decreases, the inverter electronics progressively reduce motor frequency and voltage, allowing the compressor to operate at lower displacement rates. This eliminates the energy waste from repeated start/stop cycles and maintains more stable compartment temperatures. Testing by Sharp indicates approximately 40% faster ice cube formation and 10% additional energy savings in Eco Mode compared to conventional fixed-speed designs.​​

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Oil Charge Requirements and Lubrication Considerations

The FL20S88NAA specification calls for precisely 220 grams of mineral-based compressor oil—a critical parameter that directly affects motor cooling, bearing lubrication, and long-term compressor reliability. Insufficient oil reduces bearing film thickness and motor cooling effectiveness, while excess oil impairs heat transfer at the motor windings and can damage the expansion valve through oil slugging (liquid oil being pumped into the evaporator discharge line).​

The oil selection process involves considering the refrigerant miscibility characteristics. HFC-134a systems typically employ mineral oils with kinematic viscosity around 32 cSt at 40°C, a standard that balances viscous film strength at bearing surfaces with the reduced viscosity that occurs when refrigerant dissolves in the oil during system operation. At typical operating temperatures (motor discharge reaching 80−100°C), the combined refrigerant-oil mixture maintains adequate viscosity for bearing protection while allowing efficient heat transfer away from motor windings.​

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Maintenance, Diagnostics, and Service Considerations

Professional HVAC technicians servicing the Sharp SJ-PT73R-HS3 or similar systems using the FL20S88NAA require specific diagnostic approaches. Key parameters to monitor include:

Suction Pressure Monitoring: At the compressor inlet, steady-state suction pressure should reflect the evaporating temperature. For −23.3°C ASHRAE conditions, expect approximately 1.0 bar absolute. Abnormally high suction pressure suggests restricted refrigerant metering (plugged expansion valve), while low suction pressure indicates insufficient evaporator heat absorption or refrigerant charge loss.​

Discharge Pressure Analysis: Condensing temperature directly influences discharge pressure. At typical ambient conditions (27°C kitchen temperature), expect discharge pressures of 8−12 bar absolute. Excessively high discharge pressure (>14 bar) indicates condenser fouling, non-condensables in the refrigerant circuit, or restriction in the discharge line. Abnormally low discharge pressure suggests superheated refrigerant or loss of refrigerant charge.​

Motor Current Signature Analysis: The FL20S88NAA’s rated run current of 1.2−1.3A provides a baseline for condition assessment. Elevated current draw (>1.5A sustained) indicates either elevated system pressures (condenser dirty, high ambient temperature) or motor winding degradation. Diminished current draw (<1.0A) suggests insufficient load, possibly from low system pressures from refrigerant loss.​

Liquid Line Temperature: Ideally, the high-pressure liquid exiting the condenser should be 5−10°C above ambient. This “subcooling” indicates proper refrigerant charge levels and condenser performance. Insufficient subcooling suggests low charge or poor condenser air flow; excessive subcooling (>15°C above ambient) may indicate excess charge or expansion valve malfunction.

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Compatibility, Retrofitting, and Replacement Considerations

The FL20S88NAA occupies a specific application niche that has remained largely stable since its introduction in 2009, reflecting the standardization of household refrigerator designs. When replacement becomes necessary—typically after 15−20 years of operation or following mechanical failure—technicians must carefully assess compatible alternatives.

Direct Replacement Options: The HITACHI FL20H88-TAA represents a direct successor, offering identical displacement but enhanced efficiency. The H-series designation indicates “Improved” performance characteristics.​

HFC-134a Retrofitting: Any replacement compressor must be HFC-134a compatible. Retrofitting from older CFC-12 or HCFC-22 systems to R134a requires not only compressor replacement but also expansion valve adjustment (R134a typically requires finer orifice sizing), lubricant conversion (synthetic polyol ester oils for R134a vs. mineral oils for CFC-12), and sometimes condenser enhancement due to R134a’s different heat transfer characteristics.​

Cross-Reference Challenges: Different manufacturers encode compressor specifications differently. A technician replacing the FL20S88NAA might encounter GMCC, Copeland, or Tecumseh alternatives with fundamentally equivalent displacement and pressure ratings. Success requires consulting manufacturer’s cross-reference tables and verifying that replacement units operate at 220-240V/50Hz and suit LBP applications.​

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Conclusion: Integration of Compressor Technology in Modern Refrigerator Systems

The HITACHI FL20S88NAA compressor embedded within the Sharp SJ-PT73R-HS3 refrigerator-freezer unit exemplifies the technical sophistication underlying everyday household appliances. This 0.75-horsepower hermetic scroll compressor, optimized for 220-240V/50Hz operation with HFC-134a refrigerant and LBP pressure characteristics, delivers approximately 256 watts of cooling capacity while consuming just 160 watts of electrical power—a 1.6 COP that reflects decades of incremental engineering refinement.

The integration of the Hybrid Cooling System, electronic temperature control, and RSIR-method starting represents a balanced approach to refrigerant-based heat transfer, prioritizing reliability and simplicity over the variable-speed sophistication now becoming standard in premium models. For regions utilizing 50Hz electrical infrastructure and requiring robust, serviceable refrigeration systems, the specifications outlined herein provide both immediate diagnostic guidance and long-term maintenance planning tools.

As the refrigeration industry transitions toward next-generation compressor technologies—incorporating variable-speed inverter drives, alternative refrigerants such as HFO-1234yf and hydrofluoroolefins (HFOs) for reduced global warming potential, and AI-enabled predictive maintenance systems—the FL20S88NAA remains an instructive reference point for understanding the thermodynamic principles that continue to govern small-scale refrigeration applications worldwide.​

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The HITACHI FL20S88NAA 0.75 HP hermetic scroll compressor delivers 256W cooling capacity at 50Hz, utilizing HFC-134a refrigerant for household refrigerator-freezer applications. This LBP-classified unit operates reliably at 220-240V with RSIR starting method, integrated into Sharp’s SJ-PT73R-HS3 model offering 662-liter gross capacity with Hybrid Cooling System and Plasmacluster technology.