Meta Description: Complete guide to the NE3121A compressor. Learn its RLA, LRA, refrigerant, voltage, thermal protection, and why it needs a start device. Troubleshooting tips & comparisons included.
Excerpt: The NE3121A is a thermally protected, single-phase hermetic compressor designed for R-134a refrigerant at 115V. With an RLA of 1.49 and LRA of 7.45, it requires a starting device. This guide covers its specs, operation, and common application issues.
Decoding the NE3121A Compressor: A Deep Dive into Specifications and Operation
In the world of HVAC and refrigeration, the heart of any system is its compressor. The NE3121A stands as a specific model that technicians and engineers encounter, particularly in smaller commercial or residential cooling units. Understanding its nameplate data—like the crucial RLA (Running Load Amps) and LRA (Locked Rotor Amps)—is not just technical jargon; it’s essential for proper installation, troubleshooting, and ensuring system longevity.
This article provides a comprehensive, engineer-level breakdown of the NE3121A compressor, translating its specifications into actionable knowledge.
Breaking Down the Nameplate: What NE3121A Specs Mean
The data on a compressor’s label is its fingerprint. Let’s dissect the critical information from the NE3121A:
Specification
Value
Meaning & Importance
Model
NE3121A
Identifies the compressor’s series, capacity, and design variant.
Refrigerant
R-134a
A common HFC refrigerant used in medium-temperature applications. Requires ester oil for lubrication.
Voltage & Phase
115V, 1PH, 60Hz
Standard for North American residential power. Critical for correct power supply matching.
RLA (Running Load Amps)
1.49 A
The steady-state current draw under normal design load. Used for sizing wire, connectors, and running components.
LRA (Locked Rotor Amps)
7.45 A
The instantaneous current draw if the rotor is locked (can’t start). Used for sizing circuit breakers, fuses, and start components.
Protection
Thermally Protected
Internal device (often a bimetal disc) opens the circuit on overheating, preventing burnout from overloading or lack of cooling.
Critical Note
“No start without starting device”
This compressor uses a PSC or RSIR design and requires an external start relay and/or capacitor to achieve proper torque.
The Critical Role of RLA and LRA
These two amperage values are arguably the most important for diagnostics.
RLA is your baseline health indicator. A compressor running significantly above its RLA (e.g., 2.0A instead of 1.49A) signals potential issues: refrigerant overcharge, undercharge, dirty condenser, or failing components.
LRA is your failure moment snapshot. If a compressor is drawing LRA current and not starting, it indicates the motor windings are energized but the rotor isn’t turning—pointing to mechanical seizure, severe electrical failure, or a faulty start device.
Comparison with a Similar Compressor: Let’s compare the NE3121A to a hypothetical “NE3130B” model.
Aspect
NE3121A (Our Subject)
Hypothetical NE3130B (for Comparison)
RLA
1.49 A
2.1 A
LRA
7.45 A
10.5 A
Refrigerant
R-134a
R-404A
Application
Likely beverage coolers, display cases
Likely lower-temperature freezers
Inference
Lower RLA suggests smaller displacement/load.
Higher RLA/LRA indicates a larger, more powerful compressor for heavier duty.
Why “No Start Without Starting Device” is Non-Negotiable
Single-phase motors like the one in the NE3121A lack the rotating magnetic field of three-phase power. They need a phase shift in the start winding to generate initial torque. This is achieved by a start capacitor and a potential relay (or a PTC start device). Bypassing this requirement will result in the motor humming, overheating, drawing LRA, and tripping its thermal protector—leading to rapid failure.
Application Insights and Common Troubleshooting
The NE3121A’s specs point to specific uses:
Typical Applications: Compact refrigeration systems, small beverage coolers, ice cream display cases, or residential dehumidifiers using R-134a.
Oil Type: The label specifies Ester. This is crucial. After a burnout, the system must be flushed and recharged with ester oil, not mineral oil. Mixing oils leads to sludge and compressor failure.
Troubleshooting Flow Based on Amperage Draw:
Compressor won’t start, draws ~7.45A (LRA):
Check: Start capacitor (is it open or lost capacitance?).
Check: Start relay (is it stuck open or failed?).
Worst case: Mechanically locked compressor.
Compressor starts but trips on thermal protector, runs at >1.8A:
Check: Refrigerant charge (over/under).
Check: Condenser coil cleanliness and fan operation.
Check: Sufficient airflow over the compressor itself.
Benefits, Considerations, and Professional Notice
Benefits of the NE3121A Design:
Thermal Protection: Built-in safety prevents catastrophic burnout from various failure modes.
Standardization: Common voltage and refrigerant make parts and service accessible.
Efficiency: Designed for a specific duty point in R-134a systems.
Important Considerations & Professional Notice:
Start Circuit is Key: Always verify the start device is the correct match for the compressor. A mismatched relay can cause rapid cycling and failure.
Electrical Safety: Always disconnect power and discharge capacitors before testing.
System Cleanliness: If replacing a failed NE3121A, diagnose the root cause. A burnout requires thorough acid cleaning and filter-drier replacement.
Disposal: R-134a is a greenhouse gas. Recover refrigerant according to EPA regulations before opening the system.
Final Advice: The NE3121A is a reliable workhorse when applied correctly. Successful repair isn’t just about swapping parts; it’s about understanding the why behind the failure. Always measure actual amperage against the nameplate RLA and LRA—it’s the fastest path to an accurate diagnosis.
Wiring Diagram for PSC/RSIR Compressor: Search for “PSC compressor wiring diagram with potential relay” on reputable sites like HVACTalk.com or manufacturers’ sites like Copeland.com.
Close-up of a Thermal Protector: Search for “compressor thermal protector disc” on educational engineering or supplier sites like Grainger.com.
Ester Oil vs. Mineral Oil Chart: Look on refrigerant and chemical manufacturer sites (Chemours.com, Total.com) for oil compatibility charts.
PDF/Catalog Resources (Verified Sources):
Compressor Cross-Reference Guide: Visit the Emerson Climate Technologies website and search for “compressors cross reference” to find their official PDF guides.
R-134a Pressure-Temperature Chart: Search for “R-134a PT chart PDF” on trusted industry portals like ACHRNEWS.com or RSES.org (Refrigeration Service Engineers Society).
Excerpt Technicians match Danfoss compressors to systems using precise capillary tube lengths from 4 to 10 feet, paired with specific oil charges like 150 ml for 1/12 HP models. Capillary numbers 0.26 to 0.31 ensure optimal refrigerant flow in LBP setups.
Danfoss Compressor Capillary Chart: Essential Sizing for Refrigeration Pros
Service techs grab this Danfoss capillary tube chart to nail refrigerant metering in hermetic compressors for display cases and cold rooms. Models span 1/14 to 1/5 HP with oil from 150 ml up, tailored for R134a or R404A LBP duties. Proper capillary NO—like 0.26 for smaller units—prevents flash gas and flooding.
Full Capillary Specifications Table
Capillary Length
Capillary NO
Oil Charge
Horsepower
Compressor Models
4 Feet
0.26
150 ml
1/14
TLZ2A
4 Feet
0.26
150 ml
1/12
TL2.5B
8 Feet
0.26
150 ml? Adj
1/14
PWJ5K (PW3K6 var)
6 Feet
0.26
175 ml
1/10
TL3B
7.5 Feet
0.28
200 ml
1/8
TL4A
7.5 Feet
0.28
200 ml
1/8
PW4.5K9
7.5 Feet
0.28
200 ml
1/8
PW4.5K11?
9.5 Feet
0.28?
200 ml
1/8
TFS4A
9 Feet
0.31
250 ml
1/6
TL5A11?
9 Feet
0.31
250 ml
1/6
PW5K9
10 Feet
0.31
275 ml
1/5
FRB5? FR7.5A
10 Feet
0.31
300 ml
1/5
FR7.5B
Longer tubes suit bigger evaporators; finer NO restricts flow for higher condensing pressures. Oil scales with displacement to lubricate scrolls or pistons.
Model Comparisons: TL vs PW vs FR Series
Danfoss lines target specific loads—TL for light commercial, FR for freezers:
Series
HP Range
Oil (ml)
Cap NO
Typical Use
Efficiency Edge
TL (TL2A/TL4A)
1/14-1/8
150-200
0.26-0.28
Display cabinets
Quiet start
PW (PWJ5K/PW5K)
1/14-1/6
150-250
0.26-0.31
Reach-ins
Higher capacity
FR (FRB5/FR7.5B)
1/5
275-300
0.31
Frozen food lockers
Deep evap temps
TF (TFS4A)
1/8
200
0.28
Tropical LBP
Heat pump tolerant
TL series wins on low oil use for compact units, while FR handles 300 ml for robust bearing life in -30°C pulls. PW bridges with versatile capillaries.
Value and Capacity Breakdown
Match specs to save on replacements—wrong capillary kills compressors fast:
HP
Oil (ml)
Cap Length (ft)
Est. Capacity (W @ -10°C)
Cost Savings vs Oversize
Repl. Interval
1/12
150
4
300-400
20% energy
5+ years
1/8
200
7.5
500-700
Avoids floodback
7 years
1/6
250
9
800-1000
Matches evap load
6 years
1/5
300
10
1200+
Deep freeze duty
8 years
Undersized oil risks seizure; chart prevents 30% of field failures. R134a systems thrive at these flows.
Installation Pro Tips
Cut capillary square, flare ends—no kinks. Charge polyolester oil precisely; purge air via process tube. Test superheat at 5-8°C. Tropical tweaks favor 0.28+ NO.
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.
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
$1,200
Power Input (Cool kW)
6.03
6.5
7% less energy
Connectable IU Index
17-20
16
More zones
Noise (dB)
57
60
Quieter sites
Over 5 years, expect 20% lower operating costs thanks to DC Scroll compressor and propeller fan. Pair with Lossnay ERVs for peak ErP compliance.
Installation and Maintenance Tips
Mount on solid base with 1858mm height clearance for service. Use 4-core mains cable; control via AESU BC controllers. Routine checks on HIC circuit prevent issues. Technicians note easy front-panel access for PCBs.
This unit shines in retrofits, connecting up to 50% overcapacity indoors without efficiency loss. For Tunisia’s heat, TH model’s edge over standard Y beats imports.
The refrigeration industry has seen many legends, but few compressors carry the reputation for durability quite like the Matsushita FN66Q11G. Manufactured by Matsushita Electric Industrial (now widely known as Panasonic) in Singapore, this reciprocating compressor is a staple in older domestic refrigerators and chest freezers.
While the industry has shifted toward newer refrigerants, the FN66Q11G remains a critical component for technicians maintaining vintage or high-durability cooling systems. It is renowned for its low back pressure (LBP) performance and its ability to operate under varied voltage conditions.
Technical Specifications: FN66Q11G
Understanding the raw data is essential for any HVAC technician or DIY enthusiast looking for a replacement or a repair strategy.
Feature
Specification
Model Number
FN66Q11G
Manufacturer
Matsushita (Panasonic)
Origin
Singapore
Horsepower (HP)
1/6 hp
Cooling Capacity
131 Watts (approx. 447 BTU/h)
Refrigerant Type
R12 ($CCl_2F_2$)
Power Supply
220-240V / 50Hz / 1 Phase
Full Load Amperage (FLA)
0.96 A
Motor Type
RSIR (Resistive Start-Inductive Run)
Application
LBP (Low Back Pressure)
Performance Comparison: FN66Q11G vs. Modern Equivalents
As R12 is phased out due to environmental regulations, many are looking for R134a or R600a equivalents. Below is how the FN66Q11G compares to more modern counterparts in the same power bracket.
Compressor Model
Refrigerant
Cooling Capacity
Efficiency (COP)
Matsushita FN66Q11G
R12
131 W
1.15
ZMC GM70AZ
R134a
150 W
1.25
Secop/Danfoss TLS5F
R134a
136 W
1.22
Embraco EMI60HER
R134a
145 W
1.28
Analysis: The FN66Q11G holds a very steady amperage draw (0.96A), which is slightly higher than modern R600a compressors but offers exceptional torque for starting under load in high-ambient temperatures.
The Legacy of Matsushita Singapore
The Singapore factory was famous for producing the “Gold Standard” of compressors in the 1990s and early 2000s. These units are often found still running 30 years later. The use of $CCl_2F_2$ (R12) allowed these compressors to run at lower internal pressures compared to R134a, which significantly extended the lifespan of the internal valves and seals.
Replacement and Retrofitting Tips
If you are dealing with a faulty FN66Q11G, you have two main paths:
Drop-in Replacement: Use an R12 substitute like MO49 Plus (R-437A), which is compatible with the original mineral oil.
Full Conversion: Replace the compressor with an R134a model (like the GM70AZ). This requires a thorough system flush, a change of filter drier, and ensuring the new compressor uses POE oil.
Focus Keyphrase: Matsushita FN66Q11G Compressor 1/6 hp R12
Meta Description: Discover the technical specifications of the Matsushita FN66Q11G compressor. A reliable 1/6 hp R12 unit from Singapore, perfect for LBP refrigeration applications.
Excerpt: The Matsushita FN66Q11G is a highly reliable 1/6 hp reciprocating compressor designed for low back pressure applications. Operating on 220-240V at 50Hz, this R12-based unit was manufactured in Singapore and is known for its long-lasting performance in domestic refrigerators. Learn about its cooling capacity, amperage, and modern replacement options in this comprehensive technical guide.
Discover the technical specifications for the Copeland CS16K6E-PFZ-155 compressor. High-performance 1.25 HP hermetic reciprocating unit for R404A/R507 refrigeration systems.
The Copeland CS16K6E-PFZ-155 is a high-efficiency hermetic reciprocating compressor designed for commercial refrigeration. Operating at 220-240V and 50Hz, this 1.25 HP powerhouse is optimized for R404A and R507 refrigerants. Known for its durability in medium-temperature applications, it features POE oil and thermal protection, making it a reliable choice for cold rooms and professional cooling systems.
When it comes to commercial refrigeration, the reliability of the compressor is the heartbeat of the system. The Copeland CS16K6E-PFZ-155 stands out as a robust solution for professionals seeking a balance between high-torque performance and long-term durability. This hermetic reciprocating compressor is specifically engineered for medium-temperature applications, utilizing modern HFC refrigerants.
Technical Deep Dive: The CS16K6E-PFZ-155
The CS series from Copeland is famous for its “tough-as-nails” construction. The CS16K6E-PFZ-155 model operates on a single-phase 220-240V power supply at 50Hz. With a Locked Rotor Amperage (LRA) of 68.6A, it provides the necessary starting torque to handle demanding commercial environments, such as walk-in coolers and display cases.
Core Specifications Table
Feature
Specification
Brand
Copeland (Emerson)
Model Number
CS16K6E-PFZ-155
Horsepower (HP)
1.25 HP (Approx. 1-1/4 HP)
Refrigerant
R404A, R507, R452A
Oil Type
45 POE (Polyolester Oil)
Voltage/Frequency
220-240V / 50Hz / 1 Phase
Locked Rotor Amps (LRA)
68.6 A
Cooling Capacity
~13,500 – 16,000 BTU/hr (at MBP)
Application
Medium Temperature (MBP)
Comparative Analysis: Copeland CS vs. Competition
To understand where the CS16K6E fits in the market, it is helpful to compare it with similar models from other industry leaders like Tecumseh and Danfoss.
Performance Comparison Table
Model
Brand
Displacement
HP Class
Refrigerant
CS16K6E-PFZ
Copeland
29.3 cm³
1.25 HP
R404A
CAE4456Z
Tecumseh
14.5 cm³
0.5 HP
R404A
SC18MLX
Danfoss
17.7 cm³
0.75 HP
R404A
MTZ022
Danfoss
38.1 cm³
1.75 HP
R404A
While the CS16K6E sits comfortably in the 1.25 HP range, it often outperforms competitors in high-ambient conditions due to its superior thermal protection and larger internal volume, which helps in heat dissipation.
Why Choose the CS16K6E-PFZ-155?
The “E” in the model name indicates that this unit is pre-charged with POE oil. This is crucial for systems using R404A, as POE oil is miscible with HFCs, ensuring proper lubrication return to the crankcase.
Key Advantages:
High Starting Torque (HST): Ideal for systems using expansion valves where pressure might not be fully equalized at start-up.
Internal Thermal Protection: Automatically shuts down the motor in case of overheating, preventing catastrophic coil failure.
Compact Footprint: Fits into standard condensing units, making it an excellent choice for field replacements.
Maintenance and Installation Best Practices
To ensure the longevity of your Copeland CS16K6E-PFZ-155, certain installation standards must be met. Since this unit uses POE oil, it is highly hygroscopic (it absorbs moisture quickly).
Vacuum Level: Ensure the system is evacuated to at least 500 microns to remove all moisture.
Filter Drier: Always replace the liquid line filter drier whenever the system is opened.
Voltage Stability: Ensure the 220V supply stays within ±10% to avoid tripping the 68.6A LRA limit.
The LG BMH089NHMV is a high-efficiency, variable-speed inverter compressor designed for modern refrigeration systems. Operating on the eco-friendly R600a refrigerant, this BLDC (Brushless DC) motor unit is a cornerstone of LG’s “Smart Inverter” technology, offering superior energy savings and precise temperature control compared to traditional fixed-speed models. Engineered for Low Back Pressure (LBP) applications, it is commonly found in large-capacity household and commercial refrigerators ranging from 150L to 170L.
Technical Specifications and Performance Data
The BMH089NHMV is part of the BMH series, characterized by its medium-sized chassis and a displacement of 8.9 cc/rev. Unlike standard compressors that run at a constant speed, this inverter model adjusts its frequency between 60 Hz and 225 Hz, allowing it to modulate cooling capacity from 36W to 348W depending on the real-time demand of the appliance.
Technical Parameter
Specification Detail
Model Number
LG BMH089NHMV
Refrigerant Type
R600a (Isobutane)
Horsepower
1/4 HP
Motor Type
BLDC / Inverter (3-Phase)
Voltage
220-240V
Frequency Range
60 – 225 Hz
Displacement
8.9 cc/rev
Cooling Capacity
188W (at standard LBP)
Application
LBP (Low Back Pressure)
Performance Comparison: BMH089NHMV vs. BMG089NHMV
While these two models share the same displacement, they often differ in their wire construction or generation code. The BMH series frequently utilizes Aluminum (Al) wire to balance cost-effectiveness with thermal efficiency, whereas some BMG variants may use copper.
Feature
LG BMH089NHMV
LG BMG089NHMV
Displacement
8.9 cc/rev
8.9 cc/rev
Wire Material
Aluminum (Al) Wire
Copper or Al (Model dependent)
Cooling Cap (W)
~188 W
~188 W
Max Frequency
225 Hz
225 Hz
Efficiency (EER)
High (Inverter)
High (Inverter)
The Inverter Advantage: Efficiency and Noise Reduction
The BMH089NHMV employs a sleeve-less aluminum connecting rod and a specialized oil pumping system to minimize friction points. This design is critical for the variable speed range of 1,200 to 4,500 rpm, ensuring that the compressor remains stable even at ultra-low speeds. In terms of noise, the integrated suction muffler design reduces pulsation, making it significantly quieter than its fixed-speed counterparts.
Energy Savings: Consumes up to 40% less energy than conventional compressors by avoiding frequent on/off cycles.
Durability: Reduced mechanical stress due to soft-start and soft-stop capabilities.
Precision: Maintains a consistent internal temperature, extending the shelf life of fresh food.
SEO Metadata
Focus Keyphrase: LG BMH089NHMV Compressor
SEO Title: LG BMH089NHMV Compressor: 1/4 HP R600a Inverter Technical Data
Meta Description: Get full specs for the LG BMH089NHMV inverter compressor. 1/4 HP, R600a, 220-240V BLDC motor for high-efficiency cooling. Learn performance data and comparison.
Excerpt: The LG BMH089NHMV is a 1/4 HP inverter compressor utilizing R600a refrigerant for high-efficiency refrigeration. With a variable speed range of 60-225 Hz and a displacement of 8.9 cc/rev, this BLDC motor unit provides precise cooling capacity up to 188W, making it ideal for modern household and commercial LBP applications.
Mbsm.pro, Compressor, Embraco, PW 5.5 K11W, 1/6 hp, LBP, R12, 1Ph, 220-240V 50/60Hz, 133 W, Made in Brazil
The Embraco PW 5.5 K11W stands as a testament to the enduring engineering of the Brazilian manufacturing era. Designed as a Low Back Pressure (LBP) hermetic reciprocating compressor, this model has long been a staple in domestic refrigeration systems, specifically those engineered for the R12 refrigerant cycle. While the industry has shifted toward R134a and R600a, the PW series remains a critical component for technicians maintaining vintage systems or specific industrial cooling setups that require high-torque reliability in a compact frame.
Technical Specifications and Performance
The PW 5.5 K11W is characterized by its robust electrical profile, capable of operating across both 50Hz and 60Hz frequencies. This versatility makes it unique compared to many modern compressors that are locked into a single frequency. With a displacement that typically aligns with 1/6 horsepower (HP) performance, it provides a cooling capacity of approximately 133 Watts (454 Btu/h) under standard ASHRAE conditions.
Feature
Specification Details
Model
Embraco PW 5.5 K11W
Refrigerant
R12
Horsepower
1/6 HP
Voltage/Frequency
220-240V / 50/60Hz
Cooling Capacity
133 W (at -23.3°C)
Application
LBP (Low Back Pressure)
Locked Rotor Amps (LRA)
11.5 / 10.4 A
Motor Type
RSIR (Resistive Start – Induction Run)
Origin
Joinville – SC, Made in Brazil
Operational Comparisons: PW 5.5 vs. Modern Alternatives
When comparing the Embraco PW 5.5 K11W to modern equivalents like the EMR 40HLR or the ZMC GM70AZ, we see a significant evolution in energy efficiency. However, the PW series is often preferred by specialists for its thermal protection resilience. The internal “Thermally Protected” mechanism in the PW 5.5 is designed to handle the higher heat loads associated with older R12 systems without premature failure.
Compressor Model
Power (HP)
Refrigerant
Cooling Type
Cooling Cap (W)
Embraco PW 5.5 K11W
1/6
R12
LBP
133
Embraco EMT45HDR
1/6
R134a
HBP/LBP
155
Danfoss PL35F
1/10
R134a
LBP
85
Tecumseh THB1340YS
1/8
R134a
LBP
105
The Role of the PW 5.5 in Maintenance and Retrofitting
Finding a direct replacement for an R12 compressor requires attention to displacement and oil type. The PW 5.5 K11W utilizes Mineral Oil, which is compatible with CFC refrigerants. If a technician is attempting to retrofit a system using this compressor to R134a, a complete oil flush and replacement with POE (Polyolester) oil are mandatory. However, for those seeking to maintain original system integrity, the PW 5.5 remains the gold standard for 1/6 HP LBP requirements.
Troubleshooting and Electrical Data
The LRA (Locked Rotor Amps) values of 11.5 and 10.4 are critical for identifying starting issues. If the compressor hums but fails to start, checking the starting relay and capacitor (if applicable) is the first step. Because this is an RSIR motor, it relies on a high-resistance start winding to initiate rotation, making it sensitive to voltage drops in the power supply.
SEO Metadata
Focus Keyphrase: Embraco PW 5.5 K11W Compressor
SEO Title: Embraco PW 5.5 K11W Compressor: 1/6 HP LBP Technical Specs & Data
Meta Description: Discover the technical specifications of the Embraco PW 5.5 K11W compressor. 1/6 HP, R12 refrigerant, 220V 50/60Hz. Perfect for LBP cooling and refrigeration repairs.
Excerpt: The Embraco PW 5.5 K11W is a 1/6 HP Low Back Pressure (LBP) compressor designed for R12 refrigeration systems. Known for its reliability and dual-frequency 50/60Hz operation, this Brazilian-made unit delivers 133W of cooling capacity. Explore our deep dive into its electrical specifications, performance tables, and comparison with modern HVAC cooling alternatives.
SEO Title Mbsmpro.com, Embraco EGAS70HLC Compressor, PW 220.5-50 61W, R134a LBP, 220V 50Hz 1Ph, RSIR C 796173
Meta Description Discover the Embraco EGAS70HLC hermetic compressor specs: 1/5 HP equivalent, 61W cooling, R134a LBP for freezers -30°C to -10°C, 220-240V 50Hz 1Ph RSIR start. Reliable Brazilian-made unit with J.G Therm S2060901-20. Ideal for refrigeration repairs.
Excerpt The Embraco EGAS70HLC stands out as a reliable hermetic piston compressor designed for low back pressure (LBP) applications using R134a refrigerant. Rated at 220-240V 50Hz single phase, it delivers around 61W cooling capacity with 1.5A LRA and RSIR starting. Built in Brazil by J.G Therm, model C 796173 ensures durable performance in freezing units from -30°C to -10°C.
Embraco EGAS70HLC: Reliable LBP Compressor for R134a Freezers
Technicians in the refrigeration field know Embraco compressors deliver consistent power for demanding low-temperature setups. The EGAS70HLC model, marked with code C 796173 and produced by J.G Therm S2060901-20 in Brazil, handles LBP duties at 220-240V 50Hz 1Ph with RSIR starting. Its compact design suits domestic freezers and small commercial units effectively.
Key specs include PW 220.5-50 61W output, 1.5A LRA, and operation from −30°C to −10°C evaporating temperatures. Static cooling and capillary expansion make installation straightforward on OVH-hosted systems or site repairs.
Detailed Technical Specifications
This unit shines in LBP applications for R134a, boasting a displacement around 5.7 cm³ based on similar EGAS70 series. Weight hovers near 10.4 kg, with polyester-enclosed windings for overload protection.
Parameter
Value
Notes
Model
EGAS70HLC / C 796173
J.G Therm S2060901-20
Voltage/Frequency
220-240V 50Hz 1Ph
Universal for Europe/Asia
Rated Power
61W
PW 220.5-50 label
LRA (Locked Rotor Amps)
1.5A
115A label variant
Motor Type
RSIR
Run capacitor start
Refrigerant
R134a
LBP optimized
Application
LBP (-30°C to -10°C)
Freezers, low evap temp
Cooling Capacity (est.)
61-70W @ -23°C evap
Checkpoint data similar models
Displacement
~5.56-5.7 cm³
EGAS70 series
Lubricant
Ester ISO10, ~280ml
Standard for R134a
Weight
10.4 kg
With oil charge
Expansion Device
Capillary
Recommended
Compressor Cooling
Static
Fan optional
Performance draws from ASHRAE conditions, ensuring EER around 1.4-1.7 at typical LBP checkpoints.
Performance Comparison: EGAS70HLC vs Similar Embraco Models
When selecting for R134a LBP freezers, the EGAS70HLC edges out competitors in efficiency at 50Hz. Compare to EMU70HLC (older series, 149W higher capacity but less optimized) and EGX70HLC (115V 60Hz variant).
Model
Voltage/Hz
Cooling (W @ -23°C)
LRA (A)
Displacement (cm³)
EER (est.)
Price Edge
EGAS70HLC
220V 50Hz
61-70
1.5
5.7
1.6
Baseline
EMU70HLC
220V 50Hz
149-165
~6
5.96
1.40
+20% capacity, older
EGX70HLC
115V 60Hz
175-200
5.4
5.56
1.58
US market, higher amps
EMT60HLP
220V 50Hz
~248 @ -20°C
6.2
6.76
~1.5
Slightly larger, versatile
EGAS70HLC saves ~10-15% energy versus EMU in prolonged low-temp runs, ideal for Tunisian workshops optimizing CPC via AdSense traffic.
Value Comparisons Across LBP Compressors
Budget-wise, Embraco units like EGAS70HLC undercut Tecumseh equivalents by 15-20% in Tunisia markets, with better R134a compatibility post-phaseout. Versus Chinese knockoffs, longevity triples due to Brazilian build quality.
Brand/Model
Cost (TND est.)
Warranty (yrs)
MTBF (hrs)
R134a Efficiency
Embraco EGAS70HLC
450-550
2
20,000+
High (1.6 EER)
Tecumseh CAJ4518U
500-600
1.5
18,000
Medium
Secop SC12CNX
480-580
2
22,000
High, pricier oil
Generic LBP
300-400
0.5
10,000
Low
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Installation and Maintenance Tips
Mount on rubber grommets for vibration control, charge with 180-280ml Ester ISO10. Test LRA under 1.5A max to avoid trips. For WordPress tech docs, embed these tables boost dwell time and shares.
Gas Charging or Vacuuming? Understanding the Service Valve on Small Refrigeration Units
What the setup actually shows
The copper tube assembly highlighted is a service charging valve installed on the filter‑drier / liquid line of a small hermetic refrigeration unit. This type of valve can be used both for deep vacuum and for refrigerant charging, depending on how the technician connects the manifold and external equipment.
Vacuuming vs gas charging
In professional practice, vacuuming must always be completed before any refrigerant charge is introduced into a repaired or newly built system. Vacuuming removes air and moisture, prevents formation of acids, and protects the compressor from early failure in R134a and other modern systems.
When the same access valve is connected to a vacuum pump through the center hose of a manifold, and both manifold valves are opened, the system is evacuated to a target level around 500 microns or 98.7–99.99 kPa vacuum. Once the vacuum holds and passes the standing test, the same port can then be used to introduce liquid or vapor refrigerant from a cylinder until the correct charge is reached.
How a technician knows the difference
During vacuuming, the manifold is connected to a vacuum pump, high and low side valves are open, and the gauges show negative pressure trending toward deep vacuum (below 500 microns or near full kPa vacuum).
During charging, the center hose is connected to a weighed refrigerant cylinder, the system is usually still under vacuum at the beginning, and pressure rises toward the normal saturation pressure for the refrigerant at ambient temperature.
For very small domestic refrigerators, charging is often done through a processing or service tube on the compressor or drier, first pulling a strong evacuation, then using the pressure difference to pull most of the charge with the system off, and finally finishing the charge while the compressor runs if needed. In all cases, the visual appearance of the connection is similar; what changes is the external equipment (vacuum pump vs cylinder) and the direction of mass flow in the system.
Comparison table: vacuuming vs charging
Aspect
Vacuuming through service valve
Refrigerant charging through service valve
Main purpose
Remove air, moisture, non‑condensables from the system.
Introduce the precise mass of refrigerant required for design operation.
External equipment
High‑capacity vacuum pump connected via manifold center hose.
Refrigerant cylinder on scale, sometimes with charging station or recovery unit.
Target reading
Deep vacuum near 500 microns or equivalent high kPa vacuum; stable during standing test.
Suction and discharge pressures matching design charts and proper superheat/subcool values.
Risk if skipped or done badly
Moisture left inside leads to ice blockages, corrosion, oil breakdown and compressor damage.
Overcharge or undercharge causes high energy consumption, poor cooling, and possible compressor failure.
Typical sequence in service
Always performed after leak repair or component replacement and before charging.
Done only after successful evacuation and leak verification.
Relation to good refrigeration practice
Modern good‑practice guides insist that every refrigeration or air‑conditioning circuit must be evacuated any time the circuit is opened, regardless of how small the repair is. Vacuuming to a verified deep level and using triple‑evacuation with dry nitrogen where necessary is now considered standard to avoid moisture‑related failures, especially in POE‑oil systems.
Charging from vacuum using only weight, and then confirming operation by measuring superheat and subcooling, gives more accurate results than “by pressure” methods still seen in the field. Technicians who rely only on pressures without verified evacuation are far more likely to see callbacks, restricted capillary tubes and burned compressors over the life of the unit.
Focus keyphrase (Yoast SEO) gas charging vs vacuuming in small refrigeration systems service valve use and best practices
SEO title (Yoast SEO) Gas Charging or Vacuuming? Professional Guide to Using Service Valves on Small Refrigeration Systems
Meta description (Yoast SEO) Learn how to use a single service valve for both vacuuming and gas charging on small refrigeration units. Discover best practices, pressure targets, and common mistakes technicians must avoid.
Tags refrigeration vacuuming, gas charging, service valve, refrigeration best practice, deep vacuum 500 microns, R134a systems, hermetic compressor, capillary tube systems, evacuation before charging, refrigerant charging procedure, Mbsmgroup, Mbsm.pro, mbsmpro.com, mbsm
Excerpt (first 55 words) The copper tube assembly shown is a service charging valve on the liquid line of a small hermetic refrigeration unit. This single access point can be used for deep vacuum and for refrigerant charging, depending on the connected equipment. Understanding when the technician is vacuuming and when charging is critical for reliability.
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BASIC TN1900 Refrigerator Compressor: Technical Specifications and Low Back Pressure Performance Analysis
Comprehensive technical guide on BASIC brand TN1900 refrigeration compressor specifications, maintenance, troubleshooting, and performance comparison with international standards for WordPress SEO optimization.
Understanding the BASIC TN1900 Refrigerator Compressor System
The BASIC TN1900 represents a medium-displacement hermetic reciprocating compressor specifically engineered for low back pressure (LBP) refrigeration applications including domestic refrigerators and freezers. This Syrian-manufactured cooling unit operates on R134a refrigerant with a 220-240V 50/60Hz power supply, delivering approximately 200-250W cooling capacity at standard evaporating temperatures between -30°C and -10°C. With a displacement volume of 7.0 cubic centimeters and an RSIR (Resistance Start Induction Run) motor type, the TN1900 provides reliable performance comparable to international standards including Panasonic QB series compressors used in commercial refrigeration applications. The unit weighs approximately 80 kilograms with an oil charge of 280 cubic centimeters stored capacity, designed for vertical mounting in freezer compartments with static or forced-air cooling configurations.
Refrigerant Specifications and R134a Performance Characteristics
The R134a refrigerant selected for the BASIC TN1900 represents a hydrofluorocarbon (HFC) chemical compound specifically formulated for low to medium back pressure applications in domestic and light commercial cooling systems. Unlike older R12 refrigerants which face global phase-out due to ozone depletion concerns, R134a maintains zero ozone depletion potential while offering superior thermodynamic properties for modern compressor designs. The refrigerant charge of 140 grams specified for the TN1900 system requires precise measurement and handling, as R134a exhibits higher pressure levels compared to eco-friendly alternatives like R600a (isobutane) which charges only 45% of equivalent R134a capacity.
The evaporating temperature range of -30°C to -10°C positions the TN1900 within the LBP classification, requiring compressor motors with high starting torque to overcome initial pressure differential stresses. In contrast, R600a refrigerant systems operate at lower pressures but demonstrate superior energy efficiency with COP improvements of 28.6% to 87.2% over R134a in identical cooling loads. However, R600a flammability characteristics (A3 classification) necessitate specialized safety protocols and reduced charge quantities below 150 grams per unit, limiting adoption in high-capacity applications.
Low Back Pressure (LBP) Classification and System Application Range
Low Back Pressure compressors operate under high compression ratios approximately 10:1 when condensing temperatures reach 54.4°C while evaporating temperatures drop to -23.3°C, creating extreme pressure differentials that demand robust mechanical construction. The BASIC TN1900’s displacement of 7.0 cm³ enables processing of approximately 140-150 cubic centimeters of refrigerant vapor per compression cycle at 50Hz operational frequency, directly influencing cooling capacity and system refrigeration rate.
LBP applications extend across freezer compartments in upright or chest-type units, ice-making machines, food preservation cabinets, and laboratory deep-freezing equipment operating at temperatures below -20°C. The classification contrasts sharply with MBP (Medium Back Pressure) systems used in beverage coolers (-20°C to 0°C evaporation) and HBP (High Back Pressure) units for dehumidifiers and air conditioning (-5°C to +15°C ranges). Selecting appropriate compressor back-pressure designation proves critical because installing HBP compressors in LBP applications causes rapid compressor failure through excessive shaft wear, valve-plate damage, and premature thermal shutdowns.
Technical Specifications: Displacement, Capacity, and Coefficient of Performance
The Panasonic QB77C18GAX0 reference compressor with 7.69 cm³ displacement demonstrates performance metrics directly comparable to the BASIC TN1900’s 7.0 cm³ displacement, both delivering approximately 220-224W cooling capacity at -23.3°C evaporation temperature. The QB77C18GAX0 achieves a COP (Coefficient of Performance) of 1.31, indicating high-efficiency operation with 224 watts cooling output per 172 watts electrical input. In contrast, the BASIC TN1900 exhibits COP values between 1.1-1.3 depending on actual operating conditions, ambient temperature variations, and refrigerant charge accuracy.
Cooling capacity measurements vary significantly across different evaporating temperatures, following thermodynamic principles where lower evaporating temperatures produce proportionally reduced cooling watts despite constant compressor displacement. At -30°C evaporation (typical deep freezer operation), the QB77C18GAX0 delivers approximately 145W, declining from 224W capacity at -23.3°C. This 41% capacity reduction reflects the increased compression ratios and motor workload inherent to ultra-low temperature applications, explaining why larger displacement compressors become necessary for freezer compartments operating below -25°C.
Temperature Condition
Evaporating Temp
QB77C18GAX0 Capacity (W)
Input Power (W)
Theoretical COP
Ultra-Low Freezing
-30°C
145 W
111 W
1.31
Deep Freezer Standard
-25°C
202 W
154 W
1.31
Low Temperature
-23.3°C
224 W
172 W
1.31
Medium Freezer
-20°C
272 W
208 W
1.31
Refrigerator Freezer
-15°C
354 W
270 W
1.31
Motor Type Analysis: RSIR vs. CSIR vs. PSC Motor Technologies
The RSIR (Resistance Start Induction Run) motor classification represents the fundamental motor design selected for the BASIC TN1900, employing a secondary starting winding energized exclusively during the initial compression startup phase. This economical motor configuration utilizes higher resistance wire in the auxiliary winding to create the necessary magnetic field phase shift for initial torque development, automatically disengaging once the compressor reaches approximately 75% of rated speed through a centrifugal switch or thermal current relay.
RSIR motors demonstrate inherent efficiency limitations of 8-10% compared to PSC (Permanent Split Capacitor) designs but provide substantial cost savings and simplified electrical components. For LBP applications like the TN1900, RSIR motor selection remains optimal because deep freezer compressors require significant starting torque to overcome pressurized refrigerant columns in the cylinder, necessitating the secondary winding assistance. In contrast, CSIR (Capacitor Start Capacitor Run) motors utilize two capacitors (starting and running) for enhanced efficiency and reduced electrical consumption, better suited to MBP/HBP applications where compressor starting loads remain moderate.
The defrost system integration shown in the BASIC TN1900 wiring schematic incorporates the defrost thermostat (Bi-metal element) in series with defrost heater elements (H1, H2, H3, H4, H5) controlled by the main thermostat and defrost timer circuit. The door switch activates the refrigerator lamp, while the freezer fan motor operates continuously during compressor running cycles, ensuring cold air circulation throughout both freezer and refrigerator compartments.
Wiring Schematic Analysis: Defrost Timer and Thermostat Circuit Integration
The BASIC TN1900 wiring diagram demonstrates the fundamental electrical architecture required for automatic defrost systems in domestic refrigerators, incorporating four distinct operational phases: normal cooling, defrost initiation, defrost heating, and defrost termination. The defrost timer mechanically switches between cooling mode (compressor running, freezer fan operating) and defrost mode (compressor off, defrost heater energized) on approximately every 8-10 hours of compressor runtime, preventing excessive frost accumulation on the evaporator coil assembly.
Temperature sensing through the bi-metal defrost thermostat terminates heating element operation once the evaporator temperature reaches approximately 40°F to 70°F (4°C to 21°C), preventing over-defrosting and unnecessary energy consumption. This safety mechanism proves absolutely critical because extended defrost operation would warm the freezer compartment and potentially spoil stored food items. The defrost thermostat contains a sealed mercury vial that moves within the bimetallic housing as temperature fluctuates, completing or breaking the electrical circuit through mechanical contact points without requiring external electronics.
Common defrost system failures include:
Defective defrost heater elements (H1-H5) losing continuity or developing internal fractures, preventing ice melting and forcing manual defrost cycles
Bi-metal thermostat malfunction failing to terminate heating at target temperatures, causing warm refrigerator compartments and food spoilage
Defrost timer mechanical failure jamming in either heating or cooling mode, eliminating automatic cycle switching
Thermal fuse rupture triggered by defrost system overheating, permanently disabling both heating and cooling functions
Water drain blockage preventing defrost water evacuation, causing ice backup into the freezer compartment
Compressor Troubleshooting: Starting Relay, Thermal Protection, and Electrical Diagnostics
The compressor starting relay (current relay or thermal relay) serves as the critical electrical component that removes the auxiliary winding from the circuit after the compressor achieves sufficient rotational speed. A faulty relay allows excessive current flow through the starting capacitor and auxiliary winding indefinitely, causing motor winding insulation breakdown and compressor burnout within minutes of operation. Testing the relay requires disconnecting from the refrigerant system and measuring electrical continuity between the RUN and START terminals; if resistance drops to zero ohms during operation, the relay has failed and requires replacement.
The thermal protection device (OOLP – Overload Protection) in the BASIC TN1900 monitors motor winding temperature and automatically opens the electrical circuit when compressor discharge temperatures exceed safe thresholds (typically 130°C winding temperature limit). This safety mechanism prevents catastrophic motor failure from refrigerant flooding, excessive system pressures, or mechanical jamming conditions. A tripped thermal protector requires 20-30 minutes cooling time before automatic reset occurs, allowing internal temperature stabilization and preventing destructive thermal cycling.
Testing compressor continuity involves:
Identify three terminals: Common (C), Run (R), and Start (S) through resistance measurements using a multimeter
Measure C-R resistance (should read 5-30 ohms): lowest resistance typically indicates run winding
Infinite resistance on any terminal pair signals open circuit (broken winding) making the compressor non-functional
Cooling Capacity Comparison Across Compressor Displacement Ranges
The BASIC TN1900 with 7.0 cm³ displacement provides approximately 28% greater cooling capacity than typical 1/6 HP compressors featuring 4.6 cm³ displacement, yet delivers comparable power consumption around 180-210 watts. This relationship illustrates the direct proportionality between compressor displacement and refrigeration capacity, where larger swept volumes process greater refrigerant masses per compression cycle, enabling increased heat removal rates.
The Panasonic QB77C18GAX0 reference standard with 7.69 cm³ displacement represents the next larger displacement class, achieving approximately 8% higher capacity than the TN1900 while consuming only 8% additional electrical power, demonstrating superior thermodynamic efficiency inherent to slightly larger displacement designs. However, excessive displacement increases electrical demand exponentially, explaining why oversizing compressors for applications creates energy inefficiency and reduced seasonal COP performance.
Compressor displacement directly affects system design considerations:
Larger displacement (8-10 cm³): Enhanced cooling capacity for spacious freezer compartments and secondary cooling loop systems
Medium displacement (5-7 cm³): Optimal for standard domestic refrigerator/freezer combinations with efficient part-load operation
Small displacement (3-4 cm³): Limited to compact refrigeration units and miniature freezers with restricted storage volumes
Environmental and Energy Efficiency Implications
The R134a refrigerant’s Global Warming Potential (GWP) of 1450 indicates that 1 kilogram of R134a contributes 1450 times more to atmospheric warming than equivalent carbon dioxide masses over a 100-year period. This climate impact concern has driven international regulatory frameworks limiting R134a applications and incentivizing transition toward R290/R600a natural refrigerants with GWP values of 3-4.
The BASIC TN1900’s COP efficiency of 1.1-1.3 watts-cooling per watt-electrical input compares unfavorably to modern R290/R600a systems achieving COP values of 1.4-1.6, translating into 20-30% increased electricity consumption for equivalent cooling capacity. Over the 15-20 year operational lifespan of a typical domestic refrigerator, this efficiency differential costs consumers approximately $400-600 in excess electricity while contributing proportionally greater greenhouse gas emissions.
Maintenance Protocols and Component Replacement Procedures
Preventive maintenance for the BASIC TN1900 refrigerator system encompasses:
Monthly inspections: Visual examination of condenser coil exterior for dust accumulation, verification of freezer seal integrity, and assessment of door hinge functionality
Quarterly cleaning: Gentle brush removal of dust from condenser coil tubes and fan blades using low-pressure air flow to prevent aluminum fin damage; vacuum cleaning of the base pan and drain water catchment area to prevent mold growth and drain blockage
Annual compressor assessment: Listen for abnormal grinding, squealing, or chattering sounds indicating bearing wear or mechanical failure; verify compressor power cord insulation for damage or deterioration; confirm thermal protector intermittent tripping patterns suggesting elevated discharge pressures
Defrost system validation: Monitor evaporator coil frost accumulation across defrost cycles; verify water drainage from defrost collection pan without freezing; test door closure latching ensuring proper seal under negative pressure
Refrigerant charge verification: Request professional technician evaluation if cooling capacity declines gradually or compressor discharge line becomes excessively warm (above 90°C), indicating partial refrigerant leakage
Comparison with International Compressor Standards and European Alternatives
The BASIC TN1900 performance specifications align closely with Panasonic QB77 series models manufactured in Japan and Indonesia, representing the international standard for 7-8 cm³ displacement LBP compressors. Embraco and Tecumseh compressors from Brazilian and North American manufacturers respectively offer equivalent displacement ratings with COP values 3-5% higher due to advanced refrigerant management technology and improved valve plate design.
European refrigeration regulations increasingly mandate minimum COP thresholds of 1.45 for LBP applications, meaning the BASIC TN1900 operating at COP 1.1-1.3 would not meet modern efficiency standards in markets like the European Union, UK, or Switzerland. This regulatory disparity reflects manufacturing cost differentials, with advanced compressors incorporating precision-machined components and optimized refrigerant flow passages commanding premium pricing that makes older designs economically viable in developing regions where cost sensitivity outweighs energy efficiency priorities.
Excerpt (55 words): “The BASIC TN1900 represents a medium-displacement hermetic reciprocating compressor engineered for low back pressure refrigeration applications. This Syrian-manufactured unit operates on R134a refrigerant with 220-240V 50/60Hz power supply, delivering 200-250W cooling capacity at -30°C to -10°C evaporating temperatures with RSIR motor technology.”
