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.…
| 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 |
| 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 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…
| 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 |
| 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 |
| 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 |
Zener diodes like the 1N4728A thru 1N4737A series deliver reliable voltage regulation from 3.3V to 7.5V at 1W power. Engineers rely on these for stabilizing circuits in power supplies and protection setups. Check the full…
| Part Number | Zener Voltage (Vz) | Test Current (IzT) | Max Zener Impedance (Zz) | Max Power (Pd) |
|---|
| 1N4728A | 3.3V | 76 mA | 10 Ω | 1W |
| 1N4729A | 3.6V | 69 mA | 10 Ω | 1W |
| 1N4730A | 3.9V | 64 mA | 9 Ω | 1W |
| 1N4731A | 4.3V | 58 mA | 9 Ω | 1W |
| 1N4732A | 4.7V | 53 mA | 9 Ω | 1W |
| 1N4733A | 5.1V | 49 mA | 9 Ω | 1W |
| 1N4734A | 5.6V | 45 mA | 9 Ω | 1W |
| 1N4735A | 6.2V | 41 mA | 10 Ω | 1W |
| 1N4736A | 6.8V | 37 mA | 10 Ω | 1W |
| 1N4737A | 7.5V | 34 mA | 15 Ω | 1W |
| Feature | 1N47xxA (1W) | 1N52xxB (0.5W) |
|---|
| Power Rating | 1W @ 50°C | 0.5W @ 75°C |
| Package | DO-41 | DO-35 (smaller) |
| Vz Example 5.1V | 1N4733A, 49mA Iz | 1N5231B, 20mA Iz |
| Max Temp | 200°C | 200°C |
| Best For | High-current regulation | Low-power signals |
| Voltage Range | Example Part | IzT (mA) | Zz (Ω) | Bulk Price (est.) |
|---|
| 3.3-4.3V | 1N4728A-1N4731A | 58-76 | 9-10 | $0.05 |
| 4.7-5.6V | 1N4732A-1N4734A | 45-53 | 9 | $0.07 |
| 6.2-7.5V | 1N4735A-1N4737A | 34-41 | 10-15 | $0.10 |
8‑pin and 11‑pin relay bases are common in control panels, but miswiring coil and contact terminals can burn a load or keep a circuit from switching. This guide explains each pin function, shows practical wiring…
| Pin | Function |
|---|
| 2, 7 | Coil (energize the relay) |
| 1 | COM for contact set #1 |
| 4 | NC with COM=1 |
| 3 | NO with COM=1 |
| 8 | COM for contact set #2 |
| 5 | NC with COM=8 |
| 6 | NO with COM=8 |
| Pin | Function |
|---|
| 2, 10 | Coil (energize the relay) |
| 1 | COM for contact set #1 |
| 4 | NC with COM=1 |
| 3 | NO with COM=1 |
| 5 | COM for contact set #2 |
| 6 | NC with COM=5 |
| 7 | NO with COM=5 |
| 11 | COM for contact set #3 |
| 8 | NC with COM=11 |
| 9 | NO with COM=11 |
| Feature | 8‑pin base | 11‑pin base |
|---|
| Contact sets | 2 changeover sets (COM/NC/NO x2) | 3 changeover sets (COM/NC/NO x3) |
| Coil terminals | 2 and 7 | 2 and 10 |
| Best for | Simple switching, holding/latching circuits | Interlocking + multiple permissives/feedback contacts |
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…
| 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. |
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…
| 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 |
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…
| 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 |
| 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 WDB4109 is a compact linear transformer used as the standby power source in many Samsung microwave ovens, converting 220 V – 230 V AC to 16.33 V and dual 5.47 V outputs for the…
| Parameter | WDB4109 value | Notes |
|---|
| Manufacturer type | WDB4109 standby transformer | Often used in Samsung microwave controllers |
| Primary voltage | 220–230 V AC, 50 Hz | Single‑phase mains input |
| Secondary 1 | 16.33 V AC ±5% | For relay and auxiliary circuits |
| Secondary 2 | 5.47 V AC ±5% | Logic / display supply 1 |
| Secondary 3 | 5.47 V AC ±5% | Logic / display supply 2 |
| Construction | Laminated EI core, bobbin‑wound | Linear, low‑frequency design |
| Typical use | Microwave oven standby / control power | Samsung and compatible models |
| Feature | WDB4109 | Generic 12 V / 9 V transformer | Generic 10.5 V, 300 mA transformer |
|---|
| Primary rating | 220–230 V / 50 Hz | 230 V / 50 Hz | 220 V / 50 Hz |
| Secondary configuration | 16.33 V + 5.47 V ×2 | 12 V / 280 mA + 8.5 V /180 mA typical | 10.5 V / 300 mA single output |
| Main application | Samsung microwave control board | Universal small appliances | Specific YW35‑032‑1T control board |
| Replacement flexibility | Requires matching three‑output voltages | Often interchangeable between brands | Usually limited to original model |
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 |
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 |
