Cubigel NUF80NA Hermetic Compressor – 1/4 HP, R290, LMBP 397 W

Cubigel NUF80NA is a 1/4 HP hermetic reciprocating compressor manufactured for commercial refrigeration appliances such as chest freezers, ice cream display cabinets and low-temperature cooler cabinets. It operates with R290 (propane); with a displacement of 8.1 cm³ it delivers a cooling capacity of 397 W (1,355 BTU/h) under ASHRAE LMBP conditions. It is the largest-displacement model of the NUF series and is used in larger freezer cabinets where the NUF70NA is not sufficient.

R290 Propane LMBP Compressor: Wide Operating Range for Freezers and Cooler Cabinets

The NUF80NA belongs to the LMBP (low-medium back pressure) class and can operate at evaporating temperatures between −40 °C and 0 °C; the same compressor can be used in both freezer and low-temperature cooler applications. Its RSCR (run capacitor) motor draws low current and runs efficiently with COP 1.84 under ASHRAE LMBP conditions. The fan-cooled body is designed for capillary tube systems. 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 NUF80NA
• Refrigerant: R290 (propane) · explosion safety approved to EN 60335-1 / EN 60335-2-34 for R290 and R600a
• Application: LMBP (low-medium back pressure) · evaporating −40 … 0 °C
• Displacement: 8.10 cm³
• Motor: RSCR (run capacitor) · main winding 8.05 Ω · auxiliary winding 14.90 Ω (25 °C)
• Power supply: 220-240 V / 50 Hz single phase · operating range 187-255 V
• Cooling: fan cooled · expansion: capillary tube
• Oil: ISO VG 10 ester, 180 cm³
• Tube inner diameters: process Ø6.2 · suction Ø6.2 · discharge Ø4.9 mm
• Dimensions: height 180 mm · base 204 × 158 mm (228 mm with terminal box)
• Mounting holes: 6 × Ø16 (170 × 70 mm)
• Weight: 9.6 kg · max. ambient temperature 43 °C

Performance (ASHRAE, Condensing +55 °C)

ASHRAE: liquid, ambient and suction temperature 32 °C, rated current 1.01 A. Under CECOMAF LMBP conditions (−25 °C, liquid 55 °C) 296 W, 208 W power input, COP 1.43. Capacity decreases as the evaporating temperature drops; make your selection according to your target cabinet temperature.

Electrical Equipment (Manufacturer References)

• Run capacitor: 6 µF
• Relay: QPE2-A15MD3 (PTC)
• Overload protector: DRB261R61A2 or BT73-130

• 🔥 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 RSCR connection the run capacitor and the PTC relay are used together; compare the refrigerant, application class and mounting hole spacing of the old compressor with the dimensional drawing. Body and mounting dimensions are the same as the NUF70NA.
• Application limit: This model is LMBP and is intended for capillary tube systems — it is not used in water dispenser and air conditioning type (HBP) applications where the evaporating temperature rises above 0 °C.