This document describes the Carrier 30GX 082-358 and 30HXC 080-375 Screw Compressor Water-Cooled Liquid Chillers and Air-Cooled Liquid Chillers, providing installation, operation, and maintenance instructions. These units are designed for 50 Hz operation.
Function Description
The Carrier 30GX and 30HXC series are liquid chillers designed to provide cooling for various applications. The 30HXC units are water-cooled, while the 30GX units are air-cooled. They use screw compressors and are engineered for safe and reliable service within their specified application range. The units can operate in different modes, including standard cooling, high condensing temperature applications, and very low temperature evaporator applications, making them versatile for various climate and system requirements. Some 30HXC units can also be configured as heat pumps for heating/cooling control.
Important Technical Specifications
- Nominal Cooling Capacity:
- 30HXC: 286-1300 kW
- 30GX: 282-1203 kW
- Refrigerant: R-134a, a fluorinated greenhouse gas with a Global Warming Potential (GWP) of 1300.
- Compressors: Geared twin screw compressors. Some 30HXC units use 30GX compressors for high condensing temperature applications.
- Expansion Device: Electronic expansion device (EXV).
- Pressure Vessels: The units incorporate pressure vessels and components from Carrier or other manufacturers, with characteristics detailed on the nameplate and documentation.
- Power Supply: V-ph-Hz 400-3-50, with a voltage range of 360-440V. The control circuit is supplied via a factory-installed transformer.
- Evaporator Water Temperature (Standard):
- Entering: 6.8°C (minimum) to 21°C (maximum)
- Leaving: 4°C (minimum) to 15°C (maximum)
- Condenser Water Temperature (30HXC Water-Cooled):
- Entering: 20°C (minimum) to 45°C (maximum)
- Leaving: 25°C (minimum) to 50°C (maximum)
- Outdoor Ambient Temperature (30GX Air-Cooled):
- Minimum: -18°C (with option 28) to 6°C (standard)
- Maximum: 40°C to 46°C
- High Condensing Temperature Option (150/150A) for 30HXC: Allows operation with condenser leaving water temperatures up to 63°C.
- Very Low Temperature Option (6) for 30HXC:
- Evaporator leaving water temperature down to -10°C with 35% ethylene glycol or -7°C with 30% propylene glycol.
- Evaporator equipped with reinforced thermal 38 mm insulation.
- Uses wide-band oil differential sensor.
- Water Flow Rates (Evaporator): Vary by model, with minimums (closed loop) ranging from 8.0 l/s (30HXC 090) to 40.6 l/s (30HXC 345) for 30% propylene glycol, and maximums up to 63.0 l/s.
- Dimensions and Clearances: Detailed drawings are provided for various models (30HXC 080-190, 30HXC 200-375, 30GX 082-182, 30GX 207-358), including clearances for operation, maintenance, and heat exchanger tube removal. Multiple chiller installations require specific clearances between units and walls.
Usage Features
- PRO-DIALOG Control: Offers advanced control features, including condenser leaving water temperature control for high condensing temperature units.
- Operating Modes: Units can be configured for standard cooling, high condensing temperature, or very low temperature applications. Some 30HXC units can function as heat pumps.
- Safety Devices: Equipped with relief valves in both water and refrigerant circuits, designed to prevent overpressure. These are factory-sealed and require periodic checks.
- Refrigerant Transfer: All units include a 3/8" SAE connector on the manual liquid line valve for connection to a transfer station for refrigerant recovery.
- Flow Control: Minimum and maximum chilled water flow rates are specified, with recommendations for recirculation if flow falls below the minimum.
- Frost Protection: Essential for units operating in ambient temperatures below freezing or with low evaporator leaving temperatures.
- Noise Reduction Options: 30GX units can be equipped with acoustic panels (option 15) for low-noise operation.
- Year-Round Operation: Option 28 allows 30GX units to operate in ambient temperatures down to -18°C.
- Soft Start: Option 25 provides soft start capability for 3- and 4-compressor 30HXC and 30GX units.
- Control Box Protection: Options for increased electrical protection (IP44C, option 20) and tropicalised control boxes (option 22) are available.
- Master/Slave Mode: Two units can be operated in master/slave mode for coordinated control.
Maintenance Features
- Safety Precautions: Emphasizes the importance of authorized and qualified personnel for all electrical and refrigeration work. Units must be de-energized before maintenance.
- Leak Testing: Regular leak tests are required, and any leaks must be repaired immediately.
- Refrigerant Charging: Only R-134a liquid refrigerant should be charged at the liquid line. Specific instructions are provided for adding charge and handling low charge indications.
- Oil Charging: Procedures for low oil recharging are included.
- Filter Change: Instructions for integral oil filter change and a filter change-out schedule are provided.
- Compressor Replacement: Procedures for compressor replacement are outlined.
- Corrosion Control: Recommendations for corrosion control are given.
- Condenser Coil Maintenance: Specific instructions for condenser coil maintenance are provided.
- Safety Device Checks: High-pressure switches should be checked annually, and external overpressure devices (safety valves) every five years.
- Water Box Bolt Tightening: Instructions for tightening evaporator and condenser water box bolts are included.
- Documentation: The manual stresses the importance of consulting certified dimensional drawings and wiring diagrams for installation and maintenance.
- Original Parts: Only original replacement parts are recommended for repairs.
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