Cubigel NUF70NA Hermetic Compressor – 1/5 HP, R290, LMBP 328 W

Cubigel NUF70NA is a 1/5 HP hermetic reciprocating compressor built for commercial refrigeration appliances such as freezer cabinets, ice cream display cases and low-temperature refrigerated cabinets. It runs on R290 (propane); with a 6.7 cm³ displacement it delivers 328 W (1,119 BTU/h) at ASHRAE LMBP conditions of cooling capacity.

R290 Propane LMBP Compressor: Wide Operating Range for Freezer and Refrigerated Cabinets

The NUF70NA belongs to the LMBP (low-medium back pressure) class, able to operate at evaporating temperatures between −40 °C and 0 °C; the same compressor can be used in both freezer and low-temperature refrigeration applications. Its RSCR (run capacitor) motor draws low current and runs efficiently with COP 1.83 at ASHRAE LMBP conditions. Its fan-cooled body is designed for capillary tube systems. 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 NUF70NA
• Refrigerant: R290 (propane) · EN 60335-2-34 explosion safety approved for R290 and R600a
• Application: LMBP (low-medium back pressure) · evaporating −40 … 0 °C
• Displacement: 6.70 cm³ · bore 21.99 mm · stroke 17.50 mm
• Motor: RSCR (run capacitor)
• 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: service 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. At CECOMAF LMBP conditions (−25 °C, liquid 55 °C): 244 W, 172 W input power, COP 1.42. Capacity decreases as the evaporating temperature drops; choose according to your cabinet's target temperature.

Electrical Equipment (Manufacturer References)

• Run capacitor: 5 µF 450 V
• Relay: PTC K100 (200-240 V · 14 Ω)
• Thermal protector: B85-130 (9 A · open / close 130 / 62 °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 RSCR connection the run capacitor and PTC relay are used together; compare the old compressor's refrigerant, application class and mounting hole spacing against the dimensional drawing.
• Application limit: This model is LMBP and intended for capillary tube systems — it is not used in water dispenser or air-conditioning type (HBP) applications where the evaporating temperature rises above 0 °C.