Compressor description by Ralkin

General Stream CO2 Series Description: The Copeland Stream CO2 series consists of 4-cylinder semi-hermetic compressors designed specifically for R744 (CO2) refrigerant. The series is divided into transcritical models (4MTL) for high-efficiency gas cooler applications and subcritical models (4MSL) for traditional condensing applications in booster systems. The 4MTL range covers motor sizes from 5 to 50 hp.

### Model Identification:

• 4: Number of cylinders (4)
• M: M = Stream series
• TL: Application = Transcritical (R744)
• 50: Motor size = 50 hp

### Technical Features:

• Application: Designed specifically for transcritical CO2 (R744) applications.
• Oil System: Delivered with POE oil (RL 68 HB) as standard; large models can alternatively be delivered with PAG oil upon request.
• Valves: Factory-equipped with shut-off valves suitable for welding and brazing on both suction and discharge sides.
• Design: 4-cylinder semi-hermetic architecture optimized for the Stream series footprint.

### Specifications & Data:

• Application Type: Transcritical for CO2 (R744)
• Displacement: 32.0 m³/h
• Cooling Capacity (Qo): 67.80 kW ¹
• COP: 1.81
• Net Weight: Data not explicitly listed in summary table (Note: 4MTL-50 is grouped with 4MTL-35 and 4MTL-40 which share the 270 kg footprint/weight category in the table structure, but strictly the cell is merged/empty for 50 specifically while 35 is 270kg. Based on the row grouping "4MTL-35 to 4MTL-50" sharing the footprint 270kg is implied or it falls under the 270kg category. Let's look at the table: 4MTL-35 is 270kg. 4MTL-40 and 50 rows are empty. Usually, these groups share specs. I will state "270 kg" based on the group 4MTL-35 to 4MTL-50 often sharing the base, or note it is in the same group. Actually, looking at the table: 4MTL-35 | 22.7 | ... | 270. The next rows are empty. However, the pressure table groups 35-50 together. The connection table groups 35-50 together. It is safe to assume similar physical characteristics, but I will stick to explicit data if possible. If I must be precise, I will list the displacement and capacity as exact. For weight, I will omit if not explicit, or infer from the group. Let's look at 4MTL-15. It's empty weight. 4MTL-12 is 170. 4MTL-05 is 124. The pattern suggests 35, 40, 50 are larger. I will provide the specs that are explicitly row-aligned or group-aligned. Weight for 4MTL-50 is technically missing the cell content, but it shares the group with 4MTL-35 (270kg). I will list 270 kg as it is the representative for that block, or simply leave it if strict. Let's provide the ones clearly available: Displacement, Capacity, COP, Footprint. Weight is shared in group 4MTL-35 to 4MTL-50. I will list 270 kg.
• Footprint: Data grouped with 4MTL-35 (270 kg category), but specific footprint for 4MTL-50 is not explicitly in its own row. However, 4MTL-35 is 270kg. I will state the displacement and capacity clearly.
• Pressure Ratings:
  • Maximum Operating Pressure (MOP) (bar(a)): 110 / 42 (High-side / Low-side)
  • Standstill Pressure (PS / PSS) (bar(a)): 135 / 90
  • Burst Pressure (bar(a)): 420 / 330
  • Maximum Allowable Pressure (PS) High-side/Low-side: 135 bar / 90 bar
• Refrigerant & Oil:
  • Qualified Refrigerant: R744 (CO2)
  • Copeland Standard Oil: RL 68 HB (POE 68) or RFL 68 EP (PAG 68)
  • Qualified Servicing Oils: RL 68 HB (POE 68), RFL 68 EP (PAG 68)
  • Factory Oil Charge: 2.8 litres (Note: Table lists 4MTL-35, 40, 50 under the "PAG oil qualification in process" or large model section. The value 2.8 is associated with the column containing 4MTL-35, 40, 50. Wait, the table is messy. 4MTL-35, 4MTL-40, 4MTL-50* corresponds to 2.8 litres.)
• Connections (Shut-off Valves):
  • Flange Mountings: 70 x 70 mm & 52 x 52 mm
  • Suction Connection: Inner Ø 1 ⅜", Description W42.4 / ODS 1 ⅜"
  • Discharge Connection: Inner Ø 1 ⅛", Description W35 / ODS 1 ⅛"
• Other Connections:
  • Base Mountings: Ø 22 mm
  • Plug Low-Pressure Connection / Oil Drain Plug: 1/4" 18 NPTF
  • Plug High-Pressure Connection: 1/8" 27 NPTF
  • Crankcase Heater: No thread

¹ Evaporating -10 °C; gas cooler outlet temp 35 °C; high pressure 90 bar; superheat 10 K; subcooling 0 K