Cubigel NST34LA-T Hermetic Compressor – 1 HP, R290, LBP 1,539 W

Cubigel NST34LA-T is a 1 HP hermetic reciprocating compressor made for commercial refrigeration appliances operating at sub-zero temperatures, such as large-volume freezer cabinets, island freezers and ice cream cabinets. It runs on R290 (propane); with a displacement of 34.42 cm³ it delivers a cooling capacity of 1,539 W (5,251 BTU/h) at ASHRAE LBP conditions.

R290 Propane 1 HP LBP Compressor: For Large-Volume Freezers and Island Cabinets

Built on the large S series body, the NST34LA-T operates at evaporating temperatures down to −40 °C with its fan-cooled design and CSR (start and run capacitor) motor; it can be used in capillary tube and expansion valve systems. Propane has a GWP of 3; it is a suitable option for low-charge systems that are not affected by F-Gas restrictions.

Key Technical Specifications and Equipment

• Brand / Model: Cubigel NST34LA-T · S series
• Refrigerant: R290 (propane) · explosion safety approved to EN 60335-2-34 for R290 and R600a
• Application: LBP (low back pressure) · evaporating −40 … −10 °C
• Displacement: 34.42 cm³ · bore 42.86 mm · stroke 23.85 mm
• Motor: CSR · locked rotor current (LRA) 29.5 A · max. continuous current 8.1 A
• Power supply: 220-240 V / 50 Hz single-phase · operating range 198-255 V
• Cooling: fan-cooled · expansion: capillary tube or expansion valve
• Oil: ISO VG 46 ester, 700 cm³
• Tube inner diameters: suction Ø12.7 · service Ø9.7 · discharge Ø8.0 mm
• Dimensions: height 276 mm · base 226 × 176 mm
• Mounting holes: 4 × Ø19 (203.2 × 122.2 mm)
• Weight: 23 kg · max. ambient temperature 43 °C

Performance (ASHRAE, Condensing +55 °C)

ASHRAE: liquid, ambient and suction temperature 32 °C. At CECOMAF LBP conditions (−25 °C, liquid 55 °C) 1,143 W, 962 W power input, COP 1.19. Capacity decreases as the evaporating temperature drops; make your selection according to the target cabinet temperature.

Electrical Equipment (Manufacturer References)

• Start capacitor: 88-108 µF 330 V
• Run capacitor: 25 µF 420 V
• Relay (voltage relay): 3ARR3 3AV3 or RVA 2L (pick-up 224-252 V · drop-out 40-90 V)
• Overload protector: T0534 (20 A · open / close 105 / 52 °C)

• 🔥 R290 is a flammable refrigerant (class A3). Brazing, leak testing and charging must be carried out according to the rules for flammable refrigerants: a ventilated area, no ignition sources and compliance with charge limits are essential. This compressor is for R290 systems only.
• ⚡ Supply voltage: The lower limit of the operating range is 198 V; in areas with voltage drops, the use of a voltage regulator is recommended.
• 🔧 When replacing: with the CSR connection, the start and run capacitors are used together with the voltage relay; compare the refrigerant, LBP class and mounting hole spacing of the old compressor with the dimension drawing.
• Application limit: This model is LBP — it is for sub-zero freezers. It is not used in positive-temperature cooler (HBP) applications.