Carel DN33V9MR20 Universal Controller: Reliable DIN-Rail Control For Modern HVAC Systems
The Carel DN33V9MR20 is a compact universal electronic controller designed for DIN‑rail mounting in professional HVAC and refrigeration panels. It offers a wide low‑voltage power‑supply range, two analogue and two digital inputs, and a robust…
| Feature | DN33V9MR20 specification |
|---|---|
| Mounting | DIN‑rail, compact housing DN33 series |
| Power supply | 12–24 Vac, 12–30 Vdc (multi‑voltage) |
| Analogue inputs | 2 AI (NTC/PTC, Pt1000, 0–5 V, 0–20 mA, depending on configuration) |
| Digital inputs | 2 DI for door switches, compressor status or alarms |
| Outputs | 1 relay / digital output with buzzer and IR receiver |
| Protection | Front panel IP40, complete controller IP10 |
| Typical uses | Refrigerated cabinets, small chillers, HVAC units, process temperature control |
Tecumseh CAJ9480T: The French‑Made Heart of Legacy R22 Cold Rooms
On the faded nameplate of this weathered compressor shell, one line stands out with absolute clarity: CAJ9480T – R22/R502 – Made in France. It is the unmistakable signature of a Tecumseh L’Unité Hermétique fully hermetic…
| Parameter | Typical CAJ9480T value |
|---|---|
| Compressor type | Fully hermetic reciprocating piston |
| Nominal horsepower | Approx. 5/8 HP (medium temperature) |
| Refrigerant | R22 (older labels may mention R22/R502; some variants accept R438A) |
| Voltage / frequency | 220–240 V, single phase, 50 Hz (voltage code F/FZ) |
| Displacement | About 15.2 cm³/rev |
| Rated Load Amps (RLA) | ≈ 3.9–4.0 A at 50 Hz |
| Locked Rotor Amps (LRA) | ≈ 24 A |
| Motor type | CSR, high‑start torque with start and run capacitor |
| Oil charge | Around 475–780 ml, mineral or alkylbenzene depending on version |
| Origin | Tecumseh / L’Unité Hermétique, France |
Replacing Unionaire Sensors with Kiriazi Deep Freezer Probes: What Technicians Must Check First
The picture shows a refrigeration technician holding several tubular temperature probes and a small white connector in front of a heavily frosted evaporator, capturing the exact moment of diagnosing a sensor fault in a no‑frost…
| Item | Unionaire digital fridge sensor | Kiriazi domestic deep freezer sensor |
|---|---|---|
| Sensor type | NTC thermistor | NTC thermistor |
| Typical nominal value | About 5 kΩ or 10 kΩ at 25 °C | About 5 kΩ or 10 kΩ at 25 °C |
| Encapsulation style | White/transparent plastic tube | White plastic or metal tube |
| Common mounting location | On evaporator or in air channel | On evaporator or clipped to coil |
| Connector style | 2‑wire, small rectangular plug | 2‑wire plug or bare leads |
| Use as replacement | Accepts equivalent NTC values | Can act as substitute when values match |
DC05CDNC1C 48V DC Cabinet Air Conditioner
Outdoor telecom cabinets, base stations and industrial enclosures rely on compact DC air conditioners to keep sensitive electronics within a safe temperature range. The Envicool DC05CDNC1C 48V DC cabinet air conditioner is one of these…
| Specification | Value |
|---|---|
| Model | DC05CDNC1C cabinet air conditioner |
| Power supply | –48 V DC nominal |
| Rated cooling capacity | 550 W at L35/L35 (≈1700 BTU/h) |
| Rated cooling input | 170 W at L35/L35 |
| Refrigerant | R134a |
| Cooling function | Cooling only or cooling + heating (depending on configuration) |
| Working temperature | Approximately –40 °C to +55 °C (typical for this model range) |
| Protection rating | IP65 for outdoor installation |
| Approx. dimensions | 315 × 170 × 545 mm (W×D×H) |
Frascold D2‑15Y / D2‑15.1Y
The Frascold D2 15Y is a semi‑hermetic reciprocating compressor designed for commercial and industrial refrigeration. With a 2 HP motor and 15.4 m³/h displacement, it delivers around 6–7 kW of cooling capacity using R404A, R448A…
| Parameter | Typical value |
|---|---|
| Model | D2‑15Y / D2‑15.1Y |
| Technology | Semi‑hermetic reciprocating, 2 cylinders |
| Displacement (50 Hz) | 15.36 m³/h |
| Nominal motor power | 1.5 kW – 2 HP |
| Oil charge | ≈ 1.1 L POE oil |
| Typical cooling capacity | ≈ 6.7 kW with R404A (EN12900 reference condition) |
| Application | Low/medium‑temperature refrigeration (LBP/MBP) |
| Compatible refrigerants | R22, R134a, R404A, R507A, R407A/F, R448A, R449A |
Frascold Z40‑154Y
The photos capture a heavy‑duty Frascold Z40‑154Y semi‑hermetic compressor, an Italian 40 HP unit designed for demanding freezer and cold‑room applications. Its nameplate shows a displacement of about 154 m³/h and robust pressure ratings, while…
| Specification | Value / Description |
|---|---|
| Compressor type | Semi‑hermetic reciprocating, Frascold Z40‑154Y |
| Nominal power | Approx. 40 HP |
| Displacement at 50 Hz | About 154 m³/h (nameplate value) |
| Nominal speed at 50 Hz | Around 1450 rpm (nameplate value) |
| Supply voltage (50 Hz) | 380–420 V, 3‑phase |
| Supply voltage (60 Hz) | 440–480 V, 3‑phase |
| Max operating discharge pressure | 30 bar (nameplate) |
| Max static suction pressure | 20.5 bar (nameplate) |
| Country of manufacture | Rescaldina, Italy |
Copeland-15hp
The photos show a Copeland condensing unit on a steel base, with a semi‑hermetic compressor, air‑cooled condenser and vertical liquid receiver designed for cold room applications. This type of refrigeration unit is widely used in…
| Item | Typical Copeland data |
|---|---|
| Compressor type | Scroll or semi‑hermetic reciprocating, multi‑refrigerant, high efficiency. |
| Application range | Medium and low temperature, roughly from +12 °C down to around −40 °C depending on model. |
| Capacity range | Models sized for commercial cold rooms, freezers and display cases of various volumes. |
| Condenser | Quiet axial fans, available in standard or high‑ambient “tropical” versions. |
| Options | Digital Scroll capacity modulation, electronic controls, liquid line components and safety devices pre‑assembled. |
FFI10HAK-FFI10HAKW
The Embraco FFI10HAKW is a hermetic reciprocating compressor designed for low and medium back pressure refrigeration systems operating on R134a. It runs on 220–230 V, 50/60 Hz single‑phase power and delivers roughly 1/3 HP from…
| Specification | Value (typical) |
|---|---|
| Model | FFI10HAK / FFI10HAKW |
| Compressor type | Hermetic reciprocating, on‑off |
| Displacement | 9.04 cm³ |
| Voltage / phase / freq. | 220–230 V, 1~, 50/60 Hz |
| Refrigerant | R134a |
| Application range | L/MBP (Low & Medium Back Pressure) |
| Motor type | RSIR/CSIR, LST starting torque |
| Nominal motor power | ≃ 1/3 HP |
| Cooling capacity at −10 °C evap., +45 °C cond. | ≃ 401–510 W (EN12900) |
Zener Diode Series 1N746 to 1N5369 Overview
Zener diodes are essential components in voltage regulation and protection circuits. This guide provides a detailed overview of three popular power ratings: 0.5W, 1W, and 5W Zener diode series, covering part numbers from 1N746 to…
| 0.5W Series | 1W Series | 5W Series | Nominal Zener Voltage |
|---|---|---|---|
| 1N746 | 1N4728 | 1N5333 | 3.3V |
| 1N747 | 1N4729 | 1N5334 | 3.6V |
| 1N748 | 1N4730 | 1N5335 | 3.9V |
| 1N749 | 1N4731 | 1N5336 | 4.3V |
| 1N750 | 1N4732 | 1N5337 | 4.7V |
| 1N751 | 1N4733 | 1N5338 | 5.1V |
| 1N752 | 1N4734 | 1N5339 | 5.6V |
| 1N753 | 1N4735 | 1N5340 | 6.0V / 6.2V* |
| 1N754 | 1N4736 | 1N5341 | 6.8V |
| 1N755 | 1N4737 | 1N5342 | 7.5V |
| … (and so on, up to 100V) |
SCE SCOOP
Understanding the inner workings of a Secop SCE hermetic compressor is essential for any refrigeration technician or engineer. This comprehensive guide breaks down the complex internal components—from the crankshaft to the valve plate—providing a detailed…
| Item No. | Part Name | Primary Function |
|---|---|---|
| 01 | Compressor Cover | Protects internal parts, forms suction chamber |
| 02 | Suction Connector | Inlet for low-pressure refrigerant gas |
| 03 | Discharge Connector | Outlet for high-pressure refrigerant gas |
| 04 | Counterweight Screw | Secures the counterweight to the crankshaft |
| 05 | Slinger | Assists in oil distribution |
| 06 | Counterweight | Balances rotating assembly to reduce vibration |
| 07 | Upper Bearing | Supports the top of the rotating crankshaft |
| 08 | Crankshaft | Converts motor rotation into piston movement |
| 09 | Connecting Rod | Links the crankshaft to the piston |
| 10 | Wrist Pin | Pivot point connecting piston and connecting rod |
| 11 | Piston | Compresses refrigerant within the cylinder |
| 12 | Internal Discharge Tube | Channels compressed gas to the muffler |
| 13 | Screw | Fastens various components (e.g., muffler) |
| 14 | Discharge Muffler Gasket | Seals the discharge muffler connection |
| 15 | Crankcase | Main body housing cylinders and crankshaft |
| 16 | Valve Plate Gasket | Seals between crankcase and valve plate |
| 17 | Suction Valve | One-way valve for refrigerant intake |
| 18 | Discharge Valve | One-way valve for refrigerant outlet |
| 19 | Discharge Valve Stopper | Limits discharge valve movement |
| 21 | Cylinder Head Gasket | Seals the cylinder head |
| 22 | Suction Muffler | Reduces noise from suction gas pulsation |
| 23 | Cylinder Head | Covers the cylinder, part of compression chamber |
| 24 | Cylinder Head Screw | Secures the cylinder head |
| 25 | Rotor | Rotating part of the electric motor |
| 26 | Oil Pump | Circulates oil for lubrication |
| 27 | Stator | Stationary electromagnetic part of the motor |
| 28 | Stator Case | Holds and positions the stator |
| 29 | Suspension Spring | Vibration isolation mounting |
| 30 | Compressor Housing | Main hermetic (sealed) outer shell |
| 31 | Hermetic Terminal | Electrical connection into sealed housing |
| 32 | Base Plate | Foundation for internal assembly mounts |