Cubigel NUT60CAb Hermetic Compressor – 1/4 HP, R290, LBP 304 W

Cubigel NUT60CAb (NUT60CA) is a 1/4 HP hermetic reciprocating compressor built for commercial refrigeration appliances operating at sub-zero temperatures, such as small freezers, ice cream cabinets and chest freezers. It runs on R290 (propane); with a 6.00 cm³ displacement it delivers 304 W (1,037 BTU/h) at ASHRAE LBP conditions of cooling capacity.

R290 Propane LBP Compressor: For Small Freezers and Ice Cream Cabinets

With its compact U series body, fan-cooled design and RSCR (PTC relay, run capacitor) motor, the NUT60CAb operates in the −40 … −10 °C evaporating range and is designed for capillary tube systems. Thanks to its run capacitor motor, it offers low energy consumption with COP 1.82 at ASHRAE conditions. 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 NUT60CAb · 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: 6.00 cm³ · bore 21.99 mm · stroke 16.00 mm
• Motor: RSCR · locked rotor current (LRA) 7.1 A · max. continuous current 1.6 A
• Winding resistance (25 °C): main 13.25 Ω · auxiliary 15.70 Ω
• 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, 200 cm³
• Tube inner diameters: service Ø6.2 · suction (direct) 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: 9.31 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): 226 W, 161 W input power, COP 1.41. Capacity decreases as the evaporating temperature drops; choose according to your cabinet's target temperature.

Electrical Equipment (Manufacturer References)

• Run capacitor: 5 µF 400 V
• Relay: PTC K100 (200-240 V · 14 Ω)
• Thermal protector: T0508, AE18FU or B65-135 (6.3-6.5 A · open / close 120-135 / 61-62 °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 PTC relay and 5 µF run capacitor are used together; compare the old compressor's refrigerant, LBP class and mounting hole spacing against the dimensional drawing. Intended for capillary tube systems.
• Application limit: This model is LBP — intended for freezer and low-temperature applications. It is not used in positive-temperature coolers (HBP).