Cubigel NBC30RA Hermetic Compressor – 1/10 HP, R290, HMBP 423 W

Cubigel NBC30RA is a 1/10 HP hermetic reciprocating compressor manufactured for small light commercial appliances with positive and medium temperatures, such as bottle and beverage coolers and display cabinets. It operates with R290 (propane); with a displacement of 3.1 cm³ it delivers a cooling capacity of 423 W (364 kcal/h · 1,443 BTU/h) under ASHRAE conditions.

R290 Propane HMBP Compressor: For Beverage Coolers and Small Commercial Cabinets

NBC30RA is the R290 version of the B series and belongs to the HMBP (high-medium back pressure) class: it operates at evaporating temperatures between −25 °C and +10 °C. The CSIR (capacitor start) motor provides high starting torque; the fan-cooled body is used in capillary tube and expansion valve systems. It is the B-series equivalent of the old Cubigel D-series model ND30MB (same 3.1 cm³ displacement). Propane has a GWP of 3; the compressor is approved for R290 and R600a regarding explosion safety according to EN 60335-1 / EN 60335-2-34.

Key Technical Specifications and Equipment

• Brand / Model: Cubigel NBC30RA · B series · manufacturer Huayi Compressor
• Refrigerant: R290 (propane) · explosion safety approved to EN 60335-1 / EN 60335-2-34
• Application: HMBP (high-medium back pressure) · evaporating −25 … +10 °C
• Nominal power: 1/10 HP · ASHRAE 423 W / 1,443 BTU/h
• Displacement: 3.10 cm³ · bore 17.2 mm · stroke 13.4 mm
• Motor: CSIR (capacitor start) · main winding 24.14 Ω · start winding 17.24 Ω (25 °C)
• 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, 120 cm³
• Tube inner diameters: suction Ø6.1 · service Ø6.1 · discharge Ø5.1 mm
• Dimensions: height 155 mm · base 202 × 130 mm
• Mounting holes: 6 × Ø16 (170 × 70 mm)
• Weight: 5.8 kg (net) · max. ambient temperature 43 °C

Performance (ASHRAE, Condensing +55 °C)

ASHRAE: liquid 46 °C, ambient and suction 35 °C. Under CECOMAF conditions (+5 °C / +55 °C): 354 W, 160 W power input, COP 2.21. Capacity decreases as the evaporating temperature drops.

Electrical Equipment (Manufacturer References)

• Start capacitor: 50 µF 330 V
• Relay: QL2-3.3 B3 (pick-up 3.3 A · drop-out 2.6 A)
• Thermal protector: DRB20S61A2

• 🔧 When replacing: fit the start capacitor and relay according to the CSIR wiring. Compare the old compressor's refrigerant, HMBP class and mounting hole spacing with the dimensional drawing.
• R290 note: propane is a flammable (A3) refrigerant; use only in systems designed for R290, with compliant charging and service procedures.
• Application limit: this model is HMBP — for positive and medium temperature applications. It is not used in freezers (LBP).