Summary
Relay, model MAA‑S‑124‑C, is a 24 VDC, 5‑pin
The MEISHUO S220 series relay, model MAA‑S‑124‑C, is a 24‑volt 5‑pin SPDT automotive relay rated 20 A/10 A at 28 VDC. Its DIN 72552 terminal numbering—30, 85, 86, 87 and 87a—gives technicians a universal language…
| Terminal | Standard name | Electrical role / connection |
|---|---|---|
| 30 | Common terminal | Main common contact; connects to 87 or 87a depending on relay state. |
| 85 | Coil − (ground) | One side of the electromagnetic coil, usually tied to chassis ground. |
| 86 | Coil + (control voltage) | Coil feed from switch, ECU or control circuit. |
| 87 | Normally open (NO) contact | Connected to 30 only when the coil is energized. |
| 87a | Normally closed (NC) contact | Connected to 30 when the relay is de‑energized (changeover function). |
| Coil state | 30–87 connection | 30–87a connection | Typical use case |
|---|---|---|---|
| De‑energized (OFF) | Open | Closed | Power present when system is idle (e.g., courtesy lights). |
| Energized (ON) | Closed | Open | Power only when commanded (e.g., fan, compressor, auxiliary lights). |
| Parameter | MEISHUO MAA‑S‑124‑C (S220 family) | Typical 12 V automotive relay | Solid‑state relay module* |
|---|---|---|---|
| Coil voltage | 24 VDC | 12 VDC | 3–32 VDC input |
| Contact configuration | 1× SPDT (5‑pin) | 1× SPDT (4 or 5 pin) | 1× SPST or SPDT |
| Max contact current (NO/NC) | 20 A / 10 A @ 28 VDC | 30–40 A / 20–30 A | 2–40 A depending model |
| Coil resistance (approx.) | 1.6 kΩ | 70–90 Ω | N/A (no coil) |
| Isolation method | Mechanical gap | Mechanical gap | Semiconductor junction |
| Feature | MEISHUO MAA‑S‑124‑C 24 V | Generic ISO mini 12 V relay |
|---|---|---|
| Nominal system voltage | 24 VDC | 12 VDC |
| Application segment | Trucks, HVAC, industrial control | Passenger cars, light utility |
| Coil current (typical) | ≈15 mA at 24 V | 150–200 mA at 12 V |
| Contact current rating | 20 A/10 A | 30–40 A / 20–30 A |
| Common failure symptoms | Pitted contacts, open coil | Same, plus melted sockets at high load |
| Application | 30 connection | 87 (NO) load | 87a (NC) load | Coil trigger (86) source |
|---|---|---|---|---|
| Auxiliary fan with fail‑safe off | Battery positive via fuse | Fan motor positive | Not used | Ignition‑controlled switch |
| HVAC compressor enable / disable | 24 V supply from control transformer | Compressor contactor coil | Alarm indicator when compressor idle | Thermostat or PLC digital output |
| Headlamp‑driven work light | Dedicated fused feed | Work light lamp | Not used | Headlamp main‑beam circuit |
| Power‑saving standby mode | Constant 24 V to non‑critical loads | System ON bus | Low‑power standby bus | Control panel selector or remote contact |
Types of Electrical Wires and Their Uses
Modern installations use several wire families, each optimized for voltage level, environment, flexibility, and temperature range. Choosing the right type reduces losses, prevents overheating, and keeps residential, industrial, and communication systems compliant with safety standards.…
| Conductor size (sqmm) | Usual circuit type | Typical load examples | Notes |
|---|---|---|---|
| 0.75 sqmm | Light duty control | Doorbells, intercom signal wiring | Limited current capacity. |
| 1.0 sqmm | Lighting circuits | LED fixtures, small wall lamps | Common in low‑load lighting. |
| 1.5 sqmm | Standard lighting | Ceiling lamps, fan regulators | Widely used in residential lighting rings. |
| 2.5 sqmm | Socket outlets | TVs, PCs, small kitchen tools | Preferred for general‑purpose outlets. |
| Feature | Flexible multi‑core cable | Single PVC house wire |
|---|---|---|
| Flexibility | High, many fine strands | Low/medium, solid or few strands |
| Typical application | Appliance cords, extensions, portable tools | Fixed wiring inside conduits and walls |
| Mechanical stress | Designed for movement | Designed for static installation |
| Installation method | Plug‑and‑socket, grommets | Conduits, trunking, junction boxes |
| Parameter | Armoured cable | PVC house wire |
|---|---|---|
| Mechanical protection | Steel wire/tape armour, high impact | None, must be inside conduit |
| Cross‑section range | From 1.5 sqmm up to 400 sqmm or more | Commonly 0.75–10 sqmm |
| Installation area | Underground, outdoor trays, industry | Inside walls, ceilings, conduits |
| Cost per meter | Higher due to armour and sheath | Lower, for domestic circuits |
| Insulation material | Typical continuous temperature range | Common applications |
|---|---|---|
| PVC | −15 °C to 70–90 °C | House wiring, low‑cost appliances |
| Silicone rubber | −50 °C to 180–200 °C | Lighting near heat sources, some ovens |
| PTFE (Teflon) | −196 °C to about 260 °C | Furnaces, aerospace, high‑end electronics |
| Cable type | Typical standard | Max data rate | Typical use |
|---|---|---|---|
| Cat5e | Enhanced Category 5 | Up to 1 Gbit/s over 100 m | Standard home and small‑office LANs |
| Cat6 | Category 6 | Up to 10 Gbit/s over shorter runs | High‑speed office networks, PoE devices |
| Shielded variants | Cat5e/6 with foil or braid | Same as base standard | Noisy industrial or RF‑rich environments |
Embraco EM2Z 80HL.C compressor requires approximately 150 ml Oil
The Embraco EM2Z 80HL.C is a robust hermetic reciprocating compressor engineered for refrigeration efficiency. Featuring a 1/4 HP motor and optimized for R134a refrigerant, this Brazilian-made unit delivers reliable Low Back Pressure (LBP) performance. This…
| Specification Category | Technical Data |
|---|---|
| Brand | Embraco (Nidec) |
| Model | EM2Z 80HL.C |
| Refrigerant | R134a (Tetrafluoroethane) |
| Displacement | 6.76 cm³ (approx.) |
| Horsepower (HP) | 1/4 HP (Light) / 1/5 HP (Heavy) |
| Voltage/Frequency | 220-240V ~ 50Hz |
| Application | LBP (Low Back Pressure) |
| Evaporating Range | -35°C to -10°C (-31°F to 14°F) |
| Motor Type | RSIR / RSCR (Check Starting Device) |
| Locked Rotor Amps (LRA) | 5.32 A |
| Oil Charge Quantity | 150 ml (5.07 fl. oz.) |
| Oil Type | Ester (POE) ISO 10 |
| Expansion Device | Capillary Tube |
| Cooling Capacity | ~170 – 190 Watts (ASHRAE LBP) |
| Origin | Made in Brazil |
| Feature | Embraco EM2Z 80HL.C | Secop (Danfoss) TL5G | Tecumseh THG1365Y |
|---|---|---|---|
| Nominal HP | 1/5+ to 1/4 HP | 1/6+ to 1/5 HP | 1/5 HP |
| Displacement | 6.76 cm³ | 5.08 cm³ | 5.90 cm³ |
| Voltage | 220-240V 50Hz | 220-240V 50Hz | 220-240V 50Hz |
| Efficiency (COP) | High | Standard | Standard |
| Motor Tech | RSIR/RSCR | RSIR/CSIR | PTCS_CR |
| Oil Type | POE ISO 10 | POE | POE |
Scroll Compressor Internal Components Explained
When technicians open a scroll compressor casing, the real engineering lives in internal mechanisms invisible at first glance: the floating seal preventing vacuum damage, the motor protector monitoring temperature and amperage, the pressure relief valve,…
| Performance Metric | Scroll Compressor | Reciprocating Compressor | Advantage |
|---|---|---|---|
| Isentropic Efficiency | 85–92% | 70–80% | Scroll: 5–22% better |
| Pulsation (discharge side) | 0.2 bar | 2.5 bar | Scroll: 12× lower |
| Noise level | 5–15 dBA lower | Baseline | Scroll: Significantly quieter |
| Re-expansion losses | Minimal (no clearance volume) | Significant (clearance-volume re-expansion) | Scroll: No re-expansion loss |
| COP at 35°C condensing temp | 10% higher | Baseline | Scroll: 10% better cooling per watt |
| Cooling capacity variance with overcharge | Degrades slower | Degrades quickly | Scroll: More forgiving |
| Part-load efficiency | Excellent (fewer moving parts) | Lower (intermittent compression loses efficiency) | Scroll: Better at partial loads |
| Maintenance moving parts | 1–3 major parts (scroll set, motor) | 10–15 major parts (pistons, valves, rods, rings) | Scroll: 70% fewer parts |
| Discharge temperature | Lower, typically 20–30°F cooler | Higher, especially at high compression ratios | Scroll: Better thermal profile |
Donper K400CZ1 R134a compressor
The Donper K400CZ1 is a hermetic reciprocating compressor designed for commercial refrigerators and chest freezers operating with refrigerant R134a on 220‑240V 50Hz single‑phase power. It offers roughly 1/2 hp class performance with about 400 W…
| Item | Donper K400CZ1 value | Source |
|---|---|---|
| Brand | Donper | |
| Model | K400CZ1 | |
| Refrigerant | R134a | |
| Rated voltage | 220‑240V 50Hz, 1‑phase | |
| Application range | LBP commercial refrigeration (freezers, show cases) | |
| Nominal capacity | ≈ 400 W at LBP operating conditions | |
| Approximate horsepower class | 1/2 hp+ | |
| Cooling method | Static or forced‑air condenser, hermetic motor cooling by suction gas | |
| Motor type | RSCR or CSIR with external start components (regional variants) | |
| Thermal protection | Internal motor protector (thermally protected) | |
| Parameter | Typical K‑series R134a LBP range* |
|---|---|
| Evaporating temperature | −35 °C to −5 °C |
| Condensing temperature | 40 °C to 55 °C |
| Ambient temperature | 32 °C to 43 °C |
| Return gas temperature | 20 °C max |
| Model | Refrigerant | Voltage | Capacity class | Typical application | Comment |
|---|---|---|---|---|---|
| L65CZ1 | R134a | 220‑240V 50Hz | ≈ 1/6 hp | Small vertical cooler or minibar | Low power, very efficient, light load. |
| S72CZ1 | R134a | 220‑240V 50Hz | ≈ 1/4 hp | Under‑counter refrigerator | Balanced between energy and capacity; referenced on Mbsm.pro. |
| K375CZ1 | R134a | 220‑240V 50Hz | ≈ 1/3–3/8 hp | Medium freezer or chiller | Frequently used as predecessor to K400CZ1. |
| K400CZ1 | R134a | 220‑240V 50Hz | ≈ 1/2 hp+ (400 W) | Chest freezer, island cabinet | Higher pull‑down capacity for larger volume. |
| NE6210CZ (Donper commercial) | R134a | 220‑240V 50Hz | ≈ 3/8 hp | High‑end merchandiser | Advanced efficiency, similar duty but different platform. |
Start Run Capacitor Failure, Causes
An AC motor run capacitor such as the CBB65 SH usually explodes when it is forced to work beyond its electrical or thermal limits, or when the start‑assist components fail and leave it in the…
| Failure type | Main symptom | Root cause | Risk level for compressor |
|---|---|---|---|
| Run/start capacitor explosion | Loud pop, oil leak, swollen can, motor will not start or runs weak | Overvoltage, overheating, start‑relay fault, poor quality capacitor | Very high: repeated locked‑rotor starts overheat windings |
| Fan motor failure without capacitor damage | Fan not turning, capacitor tests normal | Worn bearings, open winding | Medium: high head pressure but no electrical blast |
| Contactor welding closed | Unit runs non‑stop even with thermostat off | Overcurrent, contact wear | High: continuous running overheats compressor and capacitor |
| Refrigerant leak | Long run time, poor cooling, but capacitor may still test good | Mechanical leak in circuit | Indirect: long run time can overheat and age capacitor faster |
| Parameter | CBB65 SH run capacitor | Typical start capacitor | Small fan run capacitor |
|---|---|---|---|
| Capacitance | 50 µF ±5% (example value) | 135–324 µF (wide range) | 3–10 µF |
| Voltage rating | 450 VAC | 250–330 VAC | 370–450 VAC |
| Duty | Continuous (motor running) | Short‑time start only | Continuous |
| Construction | Metallized polypropylene, oil‑filled or dry | Electrolytic, non‑polarized | Metallized polypropylene |
| Typical failure mode | Swelling, leaking, occasional explosion under severe stress | Violent rupture if left in circuit too long | Value drift, open circuit |
Danfoss Compressor HP Chart – TFS, FR, SC Model Reference
When a refrigerator or freezer arrives with a worn nameplate, identifying the compressor becomes difficult. The Danfoss and Secop model codes—such as TFS 4 AT, FR 8.5A, or SC 18B—tell you exactly what you're dealing…
| Model No | HP Code | Typical Watt Input | Approx. Running Current (A) | Primary Application |
|---|---|---|---|---|
| TFS 4 AT | 1/8 hp | ≈100 W | ≈0.9 A | Very small fridges, desktop coolers, R134a LBP |
| TFS 5 AT | 1/6 hp | ≈120 W | ≈1.05 A | Small bar fridges, display cabinets, LBP/MBP |
| FR 7.5 A | 1/4 hp | ≈130 W | ≈1.05 A | Efficient domestic fridges, R134a LBP systems |
| FR 8.5 A | 1/5 hp | ≈155 W | ≈1.20 A | Universal workhorse, LBP/MBP/HBP duty, R134a or R404A |
| FR 10 A | 1/3 hp | ≈170 W | ≈1.30 A | Larger fridges, small freezers, −30 °C evaporating |
| FR 11 A | 3/8 hp | ≈185 W | ≈1.30 A | Chest freezers, double-door refrigerators, commercial use |
| FR 6 B | 1/8 hp | ≈100 W | ≈0.9 A | Direct replacement for vintage FR6 models |
| FR 7.5 B | 1/6 hp | ≈135 W | ≈1.05 A | Mid-range domestic refrigerators, cooling cabinets |
| FR 8.5 B | 1/4 hp | ≈155 W | ≈1.20 A | Industry standard, found in thousands of appliances, all duty types |
| FR 11 B | 1/3 hp | ≈205 W | ≈1.35 A | Upright freezers, glass-door merchandisers, commercial cabinets |
| SC 12 A | 1/2 hp | ≈250 W | ≈2.0 A | Chest freezers, small cool rooms, MBP/HBP |
| SC 13 A | 1/2 hp | ≈250 W | ≈2.0 A | Heavier-duty SC12 replacement, upgraded cooling |
| SC 15 A | 1/2 hp | ≈315 W | ≈3.0 A | Larger merchandisers, cool rooms, all duty types |
| SC 18 A | 5/8 hp | ≈385 W | ≈2.5 A | Medium-size ice cream freezers, cold storage rooms |
| SC 18 B | 5/8 hp | ≈470 W | ≈4.2 A | Heavy-duty cooling, large cold rooms, demanding LBP/MBP/HBP applications |
| Family | Popular Models | Watt Range | Best For | Key Advantages |
|---|---|---|---|---|
| TL Series | TL4G, TL5G | 80–160 W | Domestic fridges, beverage coolers, quiet operation | Compact, low noise, modest starting current, R134a optimized |
| FR Series | FR8.5G, FR8.5CL, FR10A | 150–300 W | Small freezers, light commercial, flexible duty | Universal workhorse, handles LBP/MBP/HBP, wide evaporating window (−30 °C to +10 °C), multiple refrigerants (R134a, R404A, R507) |
| SC Series | SC18G, SC18B, SC21G | 280–470+ W | Heavy-duty freezers, cold rooms, demanding loads | Higher displacement, cooling capacity up to ~1950 W at some points, suited for commercial-grade duty cycles |
Electrical Insulators in Overhead Power Systems
Electrical insulators are fundamental safety components in overhead transmission and distribution networks, keeping high‑voltage conductors mechanically supported while blocking dangerous leakage currents. This article explains the main types of electrical insulators—disc, glass, pin, suspension, strain,…
| Material type | Electrical performance | Mechanical behavior | Pollution & aging | Typical use cases |
|---|---|---|---|---|
| Porcelain | Very good dielectric strength; proven on all voltage levels. | High compressive strength but relatively brittle under impact. | Stable over decades, but glaze can accumulate pollution and needs periodic washing. | Traditional choice for pin, post, disc, and shackle insulators in most climates. |
| Toughened glass | Excellent surface insulation and low aging; defects are easy to see through transparency. | High tensile strength; discs shatter completely when damaged, simplifying inspection. | Very resistant to pollution; smooth surface reduces leakage current. | High‑voltage suspension and strain strings, especially in polluted or coastal regions. |
| Composite polymer | Good hydrophobic surface and light weight; suitable for long spans. | Flexible core provides high impact resistance and reduced risk of brittle failure. | Excellent in severe pollution, but long‑term UV and weathering performance still monitored. | Long‑span transmission, compact lines, and areas where low maintenance is critical. |
| Insulator type | Typical voltage range | Main mechanical duty | Installation location | Strengths | Limitations |
|---|---|---|---|---|---|
| Disc / suspension | 33–765 kV overhead lines. | Carries conductor tension along flexible string. | Tower crossarms and dead‑end towers. | Modular design, easy to adapt voltage by adding discs. | Requires more hardware and careful string design. |
| Pin | Up to about 33 kV. | Supports conductor vertically on crossarm. | Wooden or steel poles in distribution systems. | Simple and low cost for lower voltages. | Cost and weight rise quickly above 33 kV; limited creepage. |
| Post | 11–245 kV depending on design. | Rigid support with cantilever loading. | Compact lines and substation busbars. | Saves vertical space and allows closer phase spacing. | Less flexible than suspension strings under large movements. |
| Shackle | Low voltage distribution (typically ≤ 11 kV). | Handles small spans and angle points on LV lines. | Wooden poles, service drops, building entries. | Robust, compact, easy to install. | Not suitable for high tension or high voltage. |
| Egg / stay | LV and MV guy wires. | Isolates stay wire from ground side tension. | Between pole and earth anchor in stays. | Improves safety at ground level and near roads. | Must be correctly positioned to avoid flashover. |
| Railway | 15–25 kV AC or 1.5–3 kV DC traction systems. | Supports catenary and contact wire under dynamic load. | Masts, portals, and tunnels in electrified routes. | Designed for vibration, pollution, and frequent pantograph contact. | Requires strict dimensional control to keep pantograph interaction stable. |
| Precipitator | Up to several tens of kV DC. | Isolates discharge electrodes and collecting plates. | Electrostatic precipitators in power and cement plants. | High resistance to contamination by dust and flue gases. | Needs special glazing and shapes to limit dust accumulation. |
Copeland ZR61KCE‑TF7‑522
The data plate on the Copeland ZR61KCE‑TF7‑522 compressor matches the official Copeland Scroll specifications for R407C air‑conditioning duty and includes the Copeland authenticity label linking to copeland.com/v, a key anti‑counterfeit feature. When purchased through an…
| Parameter | Typical value ZR61KCE | Notes |
|---|---|---|
| Nominal capacity | ≈ 17.1 kW (58,500 Btu/h) | At air‑conditioning conditions with R407C |
| Power input | ≈ 5.3 kW | Three‑phase operation |
| Nominal power | 5–6 hp | High‑back‑pressure air‑conditioning duty |
| Displacement | ≈ 14.3–14.4 m³/h | Scroll, hermetic |
| Voltage range | 380‑420 V 3Ph 50 Hz (TFD/TF7 codes) | Check plate for exact rating |
| Refrigerants | R22, R134a, R407C (depending on variant) | Plate on your unit shows R407C |
| Sound pressure | ≈ 60–63 dBA @ 1 m | Low noise scroll design |
| Model | Refrigerant | Capacity range | Power range (hp) | Application range | Note |
|---|---|---|---|---|---|
| ZR61KCE‑TF7‑522 | R22, R407C (family data) | ≈ 10–15 kW | 4–6 hp | −20 °C to +12.5 °C evap. | High‑back‑pressure AC duty. |
| ZR72KCE‑TFD‑522 | R22, R407C | ≈ 12–17 kW | 5–7 hp | Similar HBP range | Slightly higher capacity for larger rooftop units. |
| Feature | ZR61KCE‑TF7‑522 | ZR72KCE‑TFD‑522 |
|---|---|---|
| Voltage | 380‑420 V 3Ph 50 Hz (TFD/TF7) | 380‑420 V 3Ph 50 Hz |
| Displacement | ≈ 14.3–14.4 m³/h | ≈ 16–17 m³/h (family data) |
| Suction line | 7/8″ | 7/8″ |
| Discharge line | 1/2″ | 1/2″ |
| Sound level | ≈ 60–63 dBA | ≈ 61 dBA |
Tecumseh Commercial Refrigeration Compressors
Tecumseh commercial compressors range from 1/9 HP (230 W) to 3 HP (4,000 W), delivering refrigeration capacities from 278 W to 6,973 W across R404A, R134a, and legacy refrigerants. This complete technical guide provides exact…
| Model | HP Rating | Input Watts (Rated) | Refrigeration Capacity (W) | Refrigerant | Voltage/Phase | Evaporating Range | Application Type | Motor Type |
|---|---|---|---|---|---|---|---|---|
| AVA7524ZXT | 3 HP | 3,490–4,000 W (varies by refrigerant) | 6,639–6,973 W (R407A-R404A @ 20°F evap.) | R404A, R407A, R448A, R449A, R452A | 200–230V 3-phase 60Hz / 50Hz | −23.3°C to −1.1°C (−10°F to 30°F) | Medium-Back-Pressure (MBP) | HST (High Start Torque) 3-phase |
| AHA2445AXD | 1 HP | 1,225 W (R-12 @ −10°F evap.) | 1,289 W (legacy R-12) | R-12 (inactive/restricted) | 200–230V 1-phase 50/60Hz | −40°C to −12.2°C (−40°F to 10°F) | Low-Back-Pressure (LBP) | CSIR (Capacitor-Start) HST |
| AKA9438ZXA | 1/2 HP | 756 W (R404A @ 20°F evap.) | 1,099–1,112 W (R404A-R407A) | R404A, R407A, R448A, R449A, R452A | 115V 1-phase 60Hz / 100V 50Hz | −17.8°C to 10°C (0°F to 50°F) | Commercial-Back-Pressure (CBP) | CSIR HST |
| AWA2460ZXT | 1.5 HP | 1,552–1,686 W (R452A-R449A) | 1,684–1,758 W (−10°F evap.) | R404A, R407A, R448A, R449A, R452A | 200–230V 3-phase 50/60Hz | −40°C to −12.2°C (−40°F to 10°F) | Low-Back-Pressure (LBP) | HST 3-phase |
| AZA0395YXA | 1/9 HP | 230 W (R134a @ 20°F evap.) | 278 W (R134a) | R-134a | 115V 1-phase 60Hz / 100V 50Hz | −17.8°C to 10°C (0°F to 50°F) | Commercial-Back-Pressure (CBP) | RSIR (Rotary Solenoid) LST |
| AKA9442EXD-R | 1/2 HP | 760 W (R-22 @ 20°F evap.) | 1,231 W (R-22) | R-22, R-407C | 208–230V 1-phase 60Hz / 200V 50Hz | −17.8°C to 10°C (0°F to 50°F) | Commercial-Back-Pressure (CBP) | CSR (Capacitor-Start) HST |
| AKA4476YXA-R | 3/4 HP | 1,070–1,111 W (R134a-R513A) | 2,250–2,265 W (45°F evap.) | R-134a, R-513A | 115V 1-phase 60Hz / 100V 50Hz | −6.7°C to 12.8°C (20°F to 55°F) | High-Back-Pressure (HBP) | CSIR HST |
| AWG5524EXN-S | 2 HP | 1,650–2,480 W (varies load) | 7,091 W (R-22 rated) | R-22, R-407C | 208–230V 1-phase 60Hz / 200–220V 50Hz | −23.3°C to 12.8°C (−10°F to 55°F) | Multi-Temperature | PSC LST |
| AKA4460YXD | 1/2 HP | 889–890 W (R134a HT) | 6,250 BTU/h (~1,830 W) @ 20°F evap. | R-134a (high-temperature rated) | 208–230V 1-phase 60Hz | −6.7°C to 12.8°C (20°F to 55°F) | High-Back-Pressure (HBP) | CSIR HST |
| Refrigerant | Input Watts | Capacity Watts | Locked-Rotor Amps | Rated Load Amps |
|---|---|---|---|---|
| R404A | 800 W | 1,099 W | 58.8 A | 9.2 A |
| R407A | 756 W | 1,112 W | 58.8 A | 9.2 A |
| R449A | 724 W | 1,094 W | 58.8 A | 9.2 A |
| R452A | 757 W | 1,092 W | 58.8 A | 9.2 A |
| R448A | 724 W | 1,094 W | 58.8 A | 9.2 A |
| Refrigerant | Input Watts | Refrigeration Capacity (W) | Efficiency (W/W) | Discharge Temp. Trend |
|---|---|---|---|---|
| R404A | 1,630 W | 1,758 W | 1.08 | Baseline |
| R449A | 1,686 W | 1,684 W | 1.00 | Higher; more discharge heat |
| R448A | 1,686 W | 1,684 W | 1.00 | Similar to R449A |
| R452A | 1,552 W | 1,719 W | 1.11 | Lowest input; best COP |
| Evaporating Temp. | Capacity BTU/h (W) | Input Watts | Power Factor |
|---|---|---|---|
| 20°F (−6.7°C) | 950 BTU/h (278 W) | 230 W | 1.21 W/W |
| 25°F (−3.9°C) | 1,230 BTU/h (360 W) | 257 W | 1.40 W/W |
| 30°F (−1.1°C) | 1,370 BTU/h (401 W) | 274 W | 1.46 W/W |
| Refrigerant | Input Watts | Capacity (W) | COP (W/W) | Pressure Class |
|---|---|---|---|---|
| R-134a | 1,070 W | 2,250 W | 2.10 | Standard HBP |
| R-513A | 1,111 W | 2,265 W | 2.04 | Higher pressure (HFO blend) |
| Evaporating Temp. | Condensing Temp. 100°F | Condensing Temp. 110°F | Condensing Temp. 120°F |
|---|---|---|---|
| 0°F | 1,100 W input | 1,070 W input | — |
| 10°F | 1,210 W input | 1,190 W input | 1,170 W input |
| 20°F | 1,520 W input | 1,560 W input | 1,600 W input |
| Evaporating Temp. | Input Watts | Capacity (W) | Efficiency (W/W) |
|---|---|---|---|
| 20°F | 890 W | 1,830 W | 2.06 |
| 30°F | 891 W | 2,100 W | 2.36 |
| 40°F | 893 W | 2,350 W | 2.63 |
| 50°F | 895 W | 2,600 W | 2.90 |
| Model | HP | Input Watts | Cooling Watts | W/W Ratio | Efficiency Ranking |
|---|---|---|---|---|---|
| AKA4460YXD | 1/2 | 890 | 1,830–2,600 | 2.06–2.90 | Excellent (HT-optimized) |
| AKA4476YXA-R | 3/4 | 1,070 | 2,250 | 2.10 | Excellent (HT-optimized) |
| AWG5524EXN-S | 2 | 1,650–2,480 | 7,091 | 2.86 (avg) | Very Good |
| AKA9438ZXA | 1/2 | 756 | 1,099 | 1.45 | Good (CBP-rated) |
| AKA9442EXD-R | 1/2 | 760 | 1,231 | 1.62 | Good |
| AZA0395YXA | 1/9 | 230 | 278 | 1.21 | Fair (micro-sized) |
| AVA7524ZXT | 3 | 3,490–4,000 | 6,973 | 1.74–1.99 | Good |
| AWA2460ZXT | 1.5 | 1,552–1,686 | 1,758 | 1.04–1.13 | Fair (LT-rated; high pressure) |
| AHA2445AXD | 1 | 1,225 | 1,289 | 1.05 | Fair (legacy; low efficiency) |
| Refrigerant | Input Watts | Vs. R404A | Discharge Temp. | Pressure Ratio |
|---|---|---|---|---|
| R404A | 4,000 W | Baseline (highest) | 95°C (typical) | 8.5:1 |
| R449A | 3,622 W | −9.4% | 85°C (lower) | 8.1:1 |
| R448A | 3,622 W | −9.4% | 85°C (lower) | 8.1:1 |
| R452A | 3,772 W | −5.7% | 88°C | 8.3:1 |
| R407A | 3,490 W | −12.8% | 78°C (lowest) | 7.9:1 |