Donper K400CZ1 R134a compressor

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.