Cubigel NUY90LAa Hermetic Compressor – 3/8 HP, R290, LBP 451 W

Cubigel NUY90LAa is a 3/8 HP hermetic reciprocating compressor built for commercial refrigeration appliances operating at sub-zero temperatures, such as freezer cabinets, deep freezers and ice cream cabinets. It runs on R290 (propane); with an 8.90 cm³ displacement it delivers 451 W (1,539 BTU/h) at ASHRAE LBP conditions of cooling capacity.

R290 Propane LBP Compressor: For Freezer Cabinets and Deep Freezers

With its compact U series body, fan-cooled design and CSIR (start capacitor) motor, the NUY90LAa operates in the −40 … −10 °C evaporating range and can be used in both capillary tube and expansion valve systems. Its small body fits easily into narrow machine compartments. Propane has a GWP of 3, making it a suitable option for low-charge systems unaffected by F-Gas restrictions.

Key Technical Specifications and Equipment

• Brand / Model: Cubigel NUY90LAa · U series
• Refrigerant: R290 (propane) · EN 60335-1 and EN 60335-2-34 explosion safety approved for R290 and R600a
• Application: LBP (low back pressure) · evaporating −40 … −10 °C
• Displacement: 8.90 cm³ · bore 24.30 mm · stroke 19.00 mm
• Motor: CSIR · locked rotor current (LRA) 12.5 A · max. continuous current 2.5 A
• Winding resistance (25 °C): main 7.80 Ω · auxiliary 22.00 Ω
• Power supply: 220-240 V / 50 Hz single-phase · operating range 187-255 V
• Cooling: fan-cooled · expansion: capillary tube or expansion valve
• Oil: ISO VG 32 ester, 220 cm³
• Tube inner diameters: service Ø6.2 · suction Ø6.2 · discharge Ø4.9 mm
• Dimensions: height 173.5 mm · base 204 × 158 mm (228 mm with terminal box)
• Mounting holes: 6 × Ø16 (170 × 70 mm)
• Weight: 9.40 kg · max. ambient temperature 43 °C

Performance (ASHRAE, Condensing +55 °C)

ASHRAE: liquid and ambient 32 °C, suction 32 °C. At CECOMAF conditions (−25 °C, liquid 55 °C): 338 W, 280 W input power, COP 1.21. Capacity decreases as the evaporating temperature drops; choose according to your cabinet's target temperature.

Electrical Equipment (Manufacturer References)

• Start capacitor: 47-56 µF 330 V
• Relay: 2014 138 or QLZ-6.1A (pick-up 6.1 A / drop-out 5.2 A)
• Thermal protector: T0057, AE39FHY or B85-105 (8.5-9 A · open / close 105 / 61 °C)

• 🔥 R290 is a flammable refrigerant (class A3). Brazing, leak testing and gas charging must follow the rules for flammable refrigerants: a ventilated area, no ignition sources and compliance with charge limits are mandatory. This compressor is for R290 systems only.
• 🔧 When replacing: In the CSIR connection the start capacitor is used together with the relay; compare the old compressor's refrigerant, LBP class and mounting hole spacing against the dimensional drawing.
• Application limit: This model is LBP — intended for freezer and low-temperature applications. It is not used in positive-temperature coolers (HBP).