Mbsmpro.com, Compressor, Donper K400CZ1, 1/2 hp, R134a, 400 W, 220‑240V 50Hz, LBP, Hermetic, Static Cooling, RSCR, Commercial Refrigerator, Chest Freezer

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Donper K400CZ1 R134a compressor overview

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 cooling capacity, making it suitable for medium‑size display cabinets and storage equipment in supermarkets and restaurants.​

Nameplate data and technical profile

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)	​

This Donper K400CZ1 sits in the upper range of the brand’s R134a low‑back‑pressure line, intended for evaporating temperatures typically between −30 °C and −10 °C in commercial freezers.​

Applications and operating envelope

• Commercial chest freezers and island freezers that require robust starting torque and 24/7 duty under supermarket conditions.​
• Glass door merchandisers and cake displays, where stable temperature and quiet operation are important along with compact compressor dimensions.​
• Cold drink dispensers and reach‑in cabinets using capillary tube expansion, designed around R134a and LBP conditions in the Donper catalog.​

Typical operating envelope for K‑series R134a LBP compressors:

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

*Values based on Donper R134a LBP catalog ranges; check the official selection software or sheet for exact K400CZ1 limits before system design.​

Comparison with other Donper R134a models

To position the K400CZ1 inside the R134a portfolio, the next table compares it with smaller and larger Donper models used in similar equipment.​

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.​

This comparison shows how K400CZ1 extends the LBP range toward heavier commercial loads while keeping compatibility with standard R134a capillary tube systems.​

Performance and efficiency considerations

• For Donper R134a compressors working at 220‑240V 50Hz LBP, the cooling capacity range spans roughly 239–1365 Btu/h, with corresponding COP values optimized for supermarket duty.​
• A 400 W LBP compressor typically delivers COP values around 1.3–1.6 under ASHRAE 7.2/35/54 °C conditions in this power range, similar to competing hermetic brands.​

When compared with equivalent Embraco R134a LBP compressors of about 1/2 hp, K‑series Donper units generally offer comparable capacity and current draw, while often being more competitive in price for OEMs and aftermarket replacement.​

Installation, start components and reliability

• Donper specifies the use of properly matched start relays and run capacitors (for RSCR/CSIR motors) to guarantee reliable starting at low evaporating temperatures and high condensing temperatures.​
• Internal motor protection is calibrated to trip on high winding temperature or locked‑rotor current, helping to protect against fan failure, condenser clogging or incorrect voltage.​
• For long‑life operation, manufacturers recommend adequate airflow over the condenser, correct refrigerant charge, clean capillary filters and vibration‑isolating mounting grommets to protect the hermetic shell and discharge line.​

Compared with smaller domestic compressors, K400CZ1 is more sensitive to poor ventilation and dirty condensers because it works closer to its maximum envelope in heavy commercial duty; preventive maintenance is therefore critical to avoid overheating and nuisance trips.​

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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 cooling capacity, making it suitable for medium‑size display cabinets and storage equipment in supermarkets and restaurants.

Tecumseh CAJ9480T R22 Hermetic Compressor: Complete Technical Guide for Professionals

The Tecumseh / L’Unité Hermetique CAJ9480T is a fully hermetic reciprocating compressor designed for commercial refrigeration systems operating with R22 and compatible retrofit refrigerants. Widely used in small cold rooms, display cabinets and compact condensing units, it runs on 220–240 V single‑phase, 50 Hz power and delivers 5/8 HP with around 1.97 kW of cooling capacity at EN12900 conditions.​

General description

This model belongs to the CAJ family, Tecumseh’s workhorse range for medium and high back‑pressure refrigeration applications such as positive‑temperature cold rooms and commercial coolers. It is a hermetic piston compressor using a CSR motor (capacitor start, capacitor run), giving high starting torque and stable operation on standard single‑phase networks.​

Manufactured in France under the L’Unité Hermetique brand, the CAJ9480T combines compact size, good efficiency and a robust mechanical design, which explains its popularity among installers and service companies like Mbsmgroup, Mbsm.pro and mbsmpro.com.​

Main technical specifications (with HP and W)

The table below consolidates key data from Tecumseh specification sheets and trusted distributors.​

Specification	CAJ9480T value (R22, 50 Hz)
Refrigerant	R22 (and some approved retrofits such as R438A on specific codes)​
Application range	Medium / high back pressure (commercial refrigeration)​
Nominal horsepower (HP)	5/8 HP (0.625 HP)​
Nominal cooling capacity (W)	≈ 1 968 W at EN12900: 220 V, 50 Hz, +5 °C evap / +50 °C cond​
Input electrical power (W)	≈ 780–800 W at the same EN12900 rating point​
Displacement	15.2 cm³/rev​
Supply voltage	220–240 V, 1‑phase, 50 Hz​
Voltage range	187–242 V (50 Hz)​
Rated load amps (RLA, 50 Hz)	≈ 4 A​
Locked rotor amps (LRA)	≈ 24 A​
Oil type / quantity	Synthetic alkylate or mineral, approx. 475–887 cm³ depending on version​
Net weight	≈ 19–22 kg​

The nameplate visible in your photo shows “R22 – LRA 24 – 203–220 V – 50 Hz – RLA 4.00”, matching these published values and confirming a single‑phase CAJ9480T produced in France.​

Typical applications and field use

Because of its capacity, voltage and starting characteristics, the CAJ9480T fits many everyday refrigeration jobs.​

• Small cold rooms for butchers, restaurants, bakeries and mini‑markets originally charged with R22.
• Vertical display cabinets, reach‑in fridges and refrigerated counters using factory‑built condensing units.
• Custom‑built condensing units and mini‑packs produced by specialists such as Mbsmgroup, Mbsm.pro and mbsmpro.com, especially where reliable 5/8 HP performance is required on 230 V single‑phase.​

Its CSR motor and high starting torque help the compressor start under tougher conditions, such as long pipe runs or marginal supply voltage.​

Installation and maintenance best practices

Correct installation and servicing are essential to protect this compressor and keep systems efficient.​

• Flush and evacuate the circuit carefully, and always install a new filter‑drier when replacing a failed R22 compressor.
• Use the start and run capacitors and potential relay recommended by Tecumseh (for example, 88 µF start and 15 µF run on the CAJ9480T‑FZ code) and follow the official wiring diagram.​
• Verify charge, suction superheat and condensing temperature so operation stays within Tecumseh’s performance envelope.​
• For R22 retrofit projects, respect manufacturer guidance on compatible replacement refrigerants and oil changes to avoid lubrication and overheating issues.​

Working with trusted suppliers such as Mbsmgroup and its online platforms helps ensure genuine Tecumseh parts, correct electrical components and updated technical information.