Danfoss MLZ038T4LQ9A Scroll Compressor (121L8778) | 5 HP | 14,540 W (49,640 BTU/h) | R404A | 3 Phase 380-415V | Rotalock

Designed for supermarket, cold room, display cabinet, beverage cooler and process cooling applications, this is the Danfoss MLZ038T4LQ9A fixed-speed commercial refrigeration scroll compressor (Danfoss code: 121L8778). With a displacement of 80.95 cm³ and 5 HP power, it delivers, under HBP conditions, approximately 14,540 W (49,640 BTU/h) of cooling capacity. This variant has rotalock service valve connections (Q). Along with R404A/R507A, it also works with R134a, R22, R407C and the low-GWP alternatives R448A, R449A, R452A, R513A; it is filled with POE oil.

Danfoss Scroll Compressor for Commercial Refrigeration — 5 HP / 49,640 BTU/h (Rotalock)

MLZ series Maneurop scroll compressors provide reliable performance in medium and high evaporating temperature (MT/HT) refrigeration applications with few moving parts, low vibration and high efficiency. Rotalock service valves make installation and service easy. It operates with a supply range of 380-415V/3/50Hz and 460V/3/60Hz.

Key Features

• Scroll technology — few parts, low vibration, high efficiency
• Fixed speed; internal overload protector
• Wide refrigerant compatibility: R134a, R22, R404A, R407C, R448A, R449A, R452A, R507A, R513A
• 380-415V / 3 phase / 50Hz (and 460V/3/60Hz) three-phase supply
• Rotalock service valves (suction 1 1/4 inch, discharge 1 inch); CE, UL, UKCA approved

Technical Specifications

• Brand / Model: Danfoss Maneurop / MLZ038T4LQ9A (Danfoss code: 121L8778)
• Type: Scroll, fixed speed, hermetic
• Application: Commercial refrigeration — medium/high temperature (MT/HT)
• Nominal Power: 5 HP (5 horsepower) — Danfoss datasheet
• Cooling Capacity: ~14,540 W (49,640 BTU/h) — HBP (te +7.2°C / tc +54.4°C); COP ~2.19
• Displacement: 80.95 cm³ (14.1 m³/h @ 2900 rpm)
• Compatible Refrigerants: R134a, R22, R404A, R407C, R448A, R449A, R452A, R507A, R513A
• Power Supply: 380-415V/3/50Hz and 460V/3/60Hz
• Oil: POE 215PZ, 1.57 L
• Connection: Rotalock — suction 1 1/4 inch (7/8 inch / 22.2 mm tube), discharge 1 inch (1/2 inch / 12.7 mm tube)
• Pressure: High side max. 31.1 bar; low side max. 26.2 bar
• Dimensions: Height 455 mm, diameter 184 mm
• Weight: Net 37.2 kg
• Approvals: CE, UL, UKCA
• Equivalent: Copeland ZB38K class (medium temperature scroll)

Technician Tips

• Braze the connections on the rotalock service valves under nitrogen to prevent internal oxidation.
• POE oil is hygroscopic; evacuate the system thoroughly before commissioning (moisture = acid + winding failure).
• Scroll direction of rotation is critical; verify the phase sequence at first start-up.
• The stated capacity is at HBP (te +7.2°C / tc +54.4°C) conditions; confirm for your own conditions with Danfoss Coolselector.