Cubigel NX21TBA Hermetic Compressor – 7/8 HP, R290, HBP 2,715 W

Cubigel NX21TBA is a 7/8 HP hermetic reciprocating compressor built for commercial refrigeration appliances operating at positive temperatures, such as multi-door beverage coolers, display cases and large-capacity bottle coolers. It runs on R290 (propane); with a 20.72 cm³ displacement it delivers 2,715 W (9,264 BTU/h) at ASHRAE HMBP conditions of cooling capacity.

R290 Propane HMBP Compressor: For Large Beverage and Display Cabinets

With its X series body, fan-cooled design and CSR (start and run capacitor) motor, the NX21TBA can be used in both capillary tube and expansion valve systems. It produces high capacity efficiently with COP 2.55 at ASHRAE HMBP 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 NX21TBA · X series
• Refrigerant: R290 (propane) · EN 60335-2-34 explosion safety approved for R290 and R600a
• Application: HMBP (high-medium back pressure) · evaporating −25 … +10 °C
• Displacement: 20.72 cm³ · bore 34.93 mm · stroke 21.62 mm
• Motor: CSR · locked rotor current (LRA) 34.5 A · max. continuous current 8.0 A
• 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, 500 cm³
• Tube inner diameters: service Ø9.7 · suction Ø9.7 · discharge Ø6.5 mm
• Dimensions: height 221 mm · base 217 × 174 mm (257.5 mm with terminal box)
• Mounting holes: 4 × Ø19 (178 × 114.3 mm) · plus 2 × Ø16
• Weight: 16.09 kg · max. ambient temperature 43 °C

Performance (ASHRAE, Condensing +55 °C)

ASHRAE: liquid 46 °C, ambient and suction 35 °C. At CECOMAF HMBP conditions (+5 °C, liquid 55 °C): 2,267 W, 1,041 W input power, COP 2.18. Capacity decreases as the evaporating temperature drops; choose according to your cabinet's target temperature.

Electrical Equipment (Manufacturer References)

• Start capacitor: 88-108 µF 330 V
• Run capacitor: 16 µF 420 V
• Relay: 2014 180 or QLZ 16.7A (with NTC 15 Ω · pick-up 16.7 A / drop-out 14 A)
• Thermal protector: T0260 (22 A · open / close 105 / 52 °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 CSR connection the start and run capacitors are used together; compare the old compressor's refrigerant, HMBP class and mounting hole spacing against the dimensional drawing.
• Application limit: This model is HMBP — intended for positive-temperature coolers. It is not used in freezer (LBP) applications.