COLDZONE A2L NEXT GEN II 3 TO 22 HP AIR-COOLED CONDENSING UNITS
Product Overview and Technical Specifications
Introduction
The COLDZONE A2L NEXT GEN II series offers air-cooled condensing units ranging from 3 to 22 HP. These units are designed with improvements building on previous generations, featuring a wider selection of compressors compatible with low GWP refrigerants. They are housed in durable G90 galvanized steel enclosures with flow-through guards, highly efficient enhanced copper tube condensers, three-phase fan motors, and externally mounted service valves that are easily accessible from the cabinet exterior. The large control panel includes a swing-wide hinged door and abundant room for standard components and system accessories, along with color-coded and numbered point-to-point wiring that assists in easy service and unit maintenance.
Integral Subcooling Circuit
All A2L Next Gen II units incorporate an integral subcooling circuit. This system directs saturated liquid refrigerant from the receiver to the condenser, where it is subcooled by ambient air. This process typically achieves an average of 3°F to 5°F of subcooling, enhancing efficiency and ensuring optimal expansion device performance.
Features and Options
The following table outlines the standard, optional, and not available features for the A2L Next Gen II condensing units across different configurations (Flooded and Non-Flooded MD). A filled circle (●) indicates standard, an empty circle (○) indicates optional, and a blank cell indicates not available.
| Description | Flooded | Non-Flooded MD | ||||
|---|---|---|---|---|---|---|
| CFD | CFO | CFB | CBD | CBO | CBB | |
| All weather G90 galvanized steel painted enclosure | ● | ● | ||||
| Removable top and side panels for ease of service | ○ | ○ | ||||
| Large control panel for power and control circuits | ● | ● | ||||
| Swing wide hinged control panel door | ● | ● | ||||
| 316 Stainless Steel cabinet | ● | ● | ||||
| Hail / Snow Guards (Loose) | ○ | ○ | ||||
| Liquid injection/Demand Cooling™ for low temperature compressors | ○ | ○ | ||||
| Copeland Discus™ | ● | ● | ||||
| Copeland Scroll™ | ● | ● | ||||
| Bitzer Semi-Hermetic | ● | ● | ||||
| High efficiency condenser with enhanced copper tubes/aluminum fins | ● | ● | ||||
| Integral liquid subcooling circuit | ● | ● | ||||
| 3 phase condenser fan motor(s) (230V and 460V only) | ● | ● | ||||
| Flooded head pressure control | ○ | ○ | ||||
| Fan cycle control | ○ | ○ | ||||
| Copper or Electro Fin® coated coil | ● | ● | ||||
| Crankcase heater | ● | ● | ||||
| Compressor contactor | ● | ● | ||||
| Control transformer (460V to 230V) as required | ● | ● | ||||
| Dual pressure control (auto reset) w/ Refflex® flexible lines | ● | ● | ||||
| Color-coded wiring for ease of serviceability | ● | ● | ||||
| Pump down toggle switch | ● | ● | ||||
| External fused or non-fused disconnect | ○ | ○ | ||||
| Phase loss monitor | ● | ● | ||||
| Current sensing relay | ● | ● | ||||
| Crankcase pressure regulator | ● | ● | ||||
| Thru-the-door non-fused disconnect | ○ | ○ | ||||
| Electric defrost kits with electronic time clocks | ○ | ○ | ||||
| Electronic or mechanical air defrost time clocks | ○ | ○ | ||||
| 50 HZ defrost timers with or without contactors | ○ | ○ | ||||
| Vertical receiver (needs less refrigerant for liquid seal) | ● | ● | ||||
| Receiver isolation valve | ● | ● | ||||
| Pressure relief valve (*see note below) | ● | ● | ||||
| Base mounted liquid & suction shut-off valves (External) | ● | ● | ||||
| Liquid line kit - piping, sealed filter drier & sight glass | ● | ● | ||||
| Suction line piping | ● | ● | ||||
| Additional compressor cooling for medium temp models - liquid injection, suction accumulator, and insulated suction line components and piping. | ○ | ○ | ||||
| Additional compressor cooling for low temp models - insulated suction line components and piping | ○ | ○ | ||||
| Oversized receiver | ○ | ○ | ||||
| Heated and insulated receiver (temperature controlled and low pressure) | ○ | ○ | ||||
| Sealed suction filter | ● | ● | ||||
| Suction line accumulator | ● | ● | ||||
| Oil separator | ● | ● | ||||
| Replaceable core liquid and suction filters | ● | ● | ||||
* Note: Models in FD1 cabinets include a fusible plug for pressure relief. Models in FD2 and FD3 cabinets include a pressure relief valve.
Model Nomenclature
The model nomenclature provides a structured way to identify unit configurations:
| Component | Description |
|---|---|
| Brand | C = Coldzone |
| Style | F = Flooded, B = Non-Flooded |
| Compressor Type | D = Discus, O = Scroll, B = Bitzer |
| Compressor Configuration | S = Single Horizontal (Large) |
| Horsepower | e.g., 004 = 4 HP |
| Temperature Range | E = Extended Medium, L = Low, M = Medium |
| Refrigerant Class | 4A = R454A, R454C, or R455A |
| Voltage Code | E = 208-230/3/60, G = 460/3/60, N = 200-220/3/50, Q = 380/3/50 |
| Vintage | A |
Capacity Data
Detailed capacity data (BTUH) is provided for various models, refrigerants (R454A, R454C, R455A), compressor types (Discus, Scroll, Bitzer), and temperature ranges (Medium Temperature, Extended Range Medium Temperature, Low Temperature). These tables list capacities at different suction temperatures for specified ambient temperatures.
Due to the extensive nature of the capacity tables, the full data is not transcribed here. Please refer to the original document for complete tables.
Example: Medium Temperature Discus units with R454A refrigerant at 90°F ambient temperature and 40°F suction temperature range from approximately 60,360 BTUH (4 HP) to 175,200 BTUH (15 HP).
Electrical Data
Electrical data, including RLA (Rated Load Amps), LRA (Locked Rotor Amps), Condenser Fan FLA, MCA (Minimum Circuit Ampacity), MOPD (Maximum Overcurrent Protection), Electric Defrost Amps, and Evaporator Fan Amps, is provided for various models and voltage configurations (208-230V/3/60 Hz, 200-220V/3/50 Hz, and 460V/3/60 Hz, 380V/3/50 Hz).
Due to the extensive nature of the electrical data tables, the full data is not transcribed here. Please refer to the original document for complete tables.
Specifications
Specifications include connections (suction/liquid), pump down capacity for standard and oversized receivers, and approximate ship weight. This data is categorized by temperature range (Medium Temperature, Low Temperature) and compressor type (Discus, Scroll, Bitzer).
Example: Medium Temperature Discus units with 4 HP (e.g., C*DS004M4A**) have 1-3/8" suction and 5/8" liquid connections. The ship weight for standard receiver models is approximately 825 Lbs, and for oversized receiver models is 35.4-36.2 Lbs (refrigerant charge).
Due to the extensive nature of the specifications tables, the full data is not transcribed here. Please refer to the original document for complete tables.
Dimensional Drawings
Dimensional drawings are provided for cabinet sizes FD1, FD2, and FD3. These diagrams illustrate the overall dimensions (Depth, Width, Height) and key features like the control panel, suction, liquid, and HG bypass connections.
- FD1 Cabinets: Feature a single fan and dimensions of approximately 47-3/16" (D) x 38-5/16" (W) x 36-3/8" (H).
- FD2 Cabinets: Feature two fans and dimensions of approximately 47-3/16" (D) x 68-5/16" (W) x 36-3/8" (H).
- FD3 Cabinets: Feature two fans and dimensions of approximately 47-3/16" (D) x 68-5/16" (W) x 43-7/8" (H).
Department of Energy Annual Walk-In Energy Factor (AWEF) Ratings
The document includes Department of Energy Annual Walk-In Energy Factor (AWEF) ratings for various models across different temperature ranges and refrigerants (R454A, R454C, R455A). For Medium Temperature units, the AWEF rating is consistently 7.6. For Low Temperature units, the AWEF rating is 3.15. A statement indicates that systems with numerical values are designed and certified for use in walk-in cooler or freezer applications.
Additional Compressor Cooling
Graphs illustrate the conditions under which additional compressor cooling is recommended. This option typically includes liquid injection (TREV), suction accumulator, and insulated suction line components and piping for medium temperature applications, or just insulated suction line components and piping for low temperature applications.
