Cubigel NUY90RAa Hermetic Compressor – 3/8 HP, R290, HBP 1,236 W

Cubigel NUY90RAa (NUY 90 RAa) is a 3/8 HP hermetic reciprocating compressor made for commercial refrigeration appliances operating at above-zero temperatures, such as bottle coolers, beverage coolers, display cases and water dispensers. It runs on R290 (propane); with a displacement of 8.90 cm³, it delivers a cooling capacity of 1,236 W (4,217 BTU/h) at ASHRAE HBP conditions.

R290 Propane 3/8 HP HBP Compressor: For Bottle Coolers and Display Cabinets

With its compact U-series body, fan-cooled design and CSIR (capacitor start) motor, the NUY90RAa operates in the −15 … +10 °C evaporating range; it can be used in systems with a capillary tube or an expansion valve. At HBP ASHRAE conditions it offers high efficiency with a COP of 2.47. Propane has a GWP of 3; it is a suitable option for low-charge systems not affected by F-Gas restrictions.

Key Technical Specifications and Equipment

• Brand / Model: Cubigel NUY90RAa · U series
• Refrigerant: R290 (propane) · explosion safety approved to EN 60335-1 and EN 60335-2-34 for R290 and R600a
• Application: HBP (high back pressure) · evaporating −15 … +10 °C
• Displacement: 8.90 cm³ · bore 24.30 mm · stroke 19.00 mm
• Motor: CSIR · winding resistance (25 °C) main 6.73 Ω · auxiliary 12.64 Ω
• Power supply: 220-240 V / 50 Hz single phase · operating range 198-255 V
• Cooling: fan-cooled · expansion: capillary tube or expansion valve
• Oil: ISO VG 32 ester, 200 cm³
• Tube inner diameters: service Ø6.2 · suction Ø6.2 · discharge Ø4.9 mm
• Dimensions: height 182 mm · base 204 × 158 mm (231.7 mm with terminal box)
• Mounting holes: 6 × Ø16 (170 × 70 mm)
• Weight: 9.85 kg · max. ambient temperature 43 °C

Performance (ASHRAE, Condensing +55 °C)

ASHRAE: liquid 46 °C, ambient and suction 35 °C. At CECOMAF HBP conditions (+5 °C, liquid 55 °C): 1,038 W, 493 W input power, COP 2.11. Capacity decreases as the evaporating temperature drops; make your selection according to your target cabinet temperature.

Electrical Equipment (Manufacturer References)

• Start capacitor: 60-61 µF 330 V
• Relay: 2014 149 or QLZ-7.8A (pull-in 7.8 A / drop-out 6.65 A)
• Overload protector: B100-105 or B110-105 (10.5-11 A · opens at 105 °C)

• 🔥 R290 is a flammable refrigerant (class A3). Brazing, leak testing and 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, HBP class and mounting hole spacing with the dimensional drawing.
• Application limit: This model is HBP — it is for above-zero coolers. It is not used in freezer (LBP) applications.