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- DANFOSS Refrigeration & Air Conditioning
- Danfoss scroll VSH serie -
Danfoss scroll VSH serie -
Danfoss scroll VSH serie -
This section highlights the unique features of VSH scroll compressors, emphasizing their design and operational benefits. Key features include minimized oil circulation, controlled oil injection, and reinforced construction materials.
Inverter technology integration with scroll compressors enhances flexibility and efficiency. Performance tables and selection methods are provided for optimal compressor choice.
Discusses available compressor sizes and frequency converter options, detailing combinations based on supply voltage and other specifications.
Explains naming conventions and technical specifications for compressors and frequency converters, including details on swept volume, displacement, and protection functions.
Describes mechanisms for oil injection and lubrication to ensure smooth operation, including the use of a gerotor oil pump.
Provides capacity details under EN12900 and ARI rating conditions, essential for performance assessment.
Lists physical dimensions of compressor models to aid in installation planning.
Details types of connections available, including sight glass and oil equalization connections.
Covers electrical specifications, including supply voltage, fuses, wire sizes, and wiring diagrams for the CDS302 frequency converter.
Lists relevant approvals and certificates, ensuring compliance with directives like the Pressure Equipment Directive and Low Voltage Directive.
Outlines operational envelope, including temperature and pressure limits, and protective functions like discharge gas temperature protection.
Provides guidelines for system design, including piping considerations, heat exchanger selection, and refrigerant charge limits.
Offers advice for specific applications, such as low ambient operations and reversible heat pump systems.
Discusses methods to manage sound and vibration, including sound insulation and vibration isolation techniques.
Provides instructions for handling and mounting compressors, ensuring proper installation and operation.
This document provides comprehensive guidelines for the electrical data, connections, and wiring of the CDS302 frequency converter used with VSH compressors. It includes detailed wiring diagrams, connection specifications, and operational settings.
Piping should be designed with adequate flexibility to prevent vibration and noise. Recommendations include using a "U"-shaped trap and pump-down cycles to prevent refrigerant migration.
Inverter compressors in systems with long piping require an oil separator for proper oil return. Proper system design and oil management are essential.
Optimized R410A heat exchangers should be used for efficiency. Proper superheat control and sub-cooling are critical for system performance.
Exceeding refrigerant charge limits can lead to liquid refrigerant entering the compressor, which is detrimental to its service life.
Highlights the importance of monitoring compressor operations under low ambient temperatures and low pressure differentials.
Key considerations include maintaining a stable superheat setting and ensuring sufficient refrigerant charge for proper sub-cooling.
High condensing temperatures and low evaporating pressures necessitate discharge gas safety controls.
Proper sizing of the expansion device and maintaining adequate pressure differential are crucial.
Precautions are required to prevent liquid refrigerant carry-over during transient operations.
Warns against water entering the refrigeration circuit, which can cause electrical failures and corrosion.
The VSH scroll compressor is designed to minimize sound and vibration. Sound insulation and vibration isolation techniques are recommended.
Proper mounting using rubber grommets is essential to isolate the compressor from the base frame and minimize vibration transmission.
Each compressor is shipped with printed installation instructions, which can also be downloaded online.
Use clean, dehydrated refrigeration-grade copper tubing. Ensure no deformation or debris remains in the tubing.
For new installations with VSH compressors, use Danfoss DML 100% molecular sieve filter driers.
Avoid overheating the compressor shell during brazing. Use a heat shield and a double-tipped torch with acetylene for VSH compressors.
Use inert gas like nitrogen for pressure testing. Do not exceed specified pressures for different compressor models.
Use a mixture of nitrogen and refrigerant or nitrogen and helium for leak detection.
Moisture can cause compressor and system failures. Use a vacuum pump to achieve a minimum vacuum of 500 microns to remove moisture.
Follow a specific procedure for refrigerant charging to avoid compressor damage.
Monitor the system for at least 60 minutes after start-up to ensure proper operation.
Check the oil level with the compressor running. Top-up oil using a suitable pump if necessary.
An optional relay card may be needed for additional parameter settings.
This document provides detailed application guidelines for ordering and packaging of VSH compressors and CDS302 frequency converter kits.
The document outlines the ordering codes for VSH compressors and CDS302 frequency converters, specifying dimensions and weights for different models.
Specifications for VSH compressors and CDS302 frequency converters are detailed, including drive supply voltage and power ratings.
The document lists various accessories such as valves, adapters, connectors, and thermostats.
Updates to the document include changes to compressor nomenclature and approvals to ensure compliance with the latest standards.
Danfoss Commercial Compressors is a global leader in manufacturing compressors and condensing units for refrigeration and HVAC applications.
Catalog excerpts
ENGINEERING ^/J-nrJfjW^ Application guidelines Inverter scroll compressors
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Application Guidelines
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Application Guidelines
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Application Guidelines Reinforced high grade ductile cast iron scroll set. Oil circulation at high speed is minimized by separating oil and gas flows with an oil return tube to the sump A patented oil injection system ensures that scrolls are optimally lubricated at all compressor speeds. Oil injection is controlled by the frequency converter, avoiding increases in oil circulation ratio at high speeds. A newly developed gerotor oil pump ensures low speed bearing lubrication. Oil strainer controls risk of system debris in oil injection circuit.
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Application Guidelines Inverter compressors Compressor size Inverter technology offers more flexibility in compressor selection than fixed speed compressors. Selection of the right inverter compressor size can be done by different methods: 1. Maximum cooling capacity: Select a compressor size which achieves the peak load system cooling capacity demand at its maximum speed. 2. Nominal cooling capacity: Select a compressor size which achieves the nominal system cooling capacity at a rotational speed of 3600 - 4500 rpm (60-75 Hz). Frequency converter variants Different frequency converter variants...
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Application Guidelines Compressor nomenclature Variable speed Family, Lubricant SH scroll, POE lubricant R410A refrigerant Motor protection type N: no internal motor protection (protection by drive) Equipment version A: brazed connections Swept volume in cm3/rev Standard approval UL index Motor voltage code * J: 200-240V / 3 ph / 50 & 60 Hz G: 380-480V / 3 ph / 50 & 60 Hz H: 525-600V / 3 ph / 50 & 60 Hz * main supply voltage to frequency converter Frequency converter nomenclature CDS Dedicated compressor drive for VSH scroll Serie 302 Output power in kW H2 RFI class Enclosure protection IP rating...
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Application Guidelines Compressor specifications Technical specifications Compressor model Swept volume (cm³/rev) Frequency converter specifications Supply frequency Programmable outputs Protection functions Over-current protection, over-modulation handling, low / high current handling Compressor functions Bearings lubrication Output voltage Discharge gas temperature protection, pressostat / thermostat function, short cycle protection, oil return management VSH compressors are equipped with an oil injection system that ensures the scroll set lubrication and controls the oil circulation ratio,...
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Application Guidelines Technical specifications Capacity at EN12900 rating conditions To To: Evaporating temperature in °C Tc: Condensing temperature in °C Qo: Cooling capacity in W Superheat = 10 K Subcooling = 0 K Pe: Power input in kW Presented data are for models with motor voltage code G
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Application Guidelines Technical specifications Capacity at ARI rating conditions To To: Evaporating temperature in °C Tc: Condensing temperature in °C Qo: Cooling capacity in W Superheat = 11.1 K Subcooling = 8.3 K Pe: Power input in kW Presented data are for models with motor voltage code G
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Application Guidelines All dimensions in mm Grommet HM 8 bolt Lock washer Flat washer Steel mounting sleeve Rubber grommet
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Application Guidelines Grommet HM 8 bolt Lock washer Flat washer Power supply Steel mounting sleeve Rubber grommet
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Application Guidelines Lock washer Flat washer Steel mounting sleeve Rubber grommet
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Application Guidelines Grommet HM 8 bolt Lock washer Flat washer Power supply Steel mounting sleeve Rubber grommet
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Application Guidelines Grommet HM 8 bolt Lock washer Flat washer Steel mounting sleeve Rubber grommet Nut Compressor base plate
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Application Guidelines Sight glass VSH compressors come equipped with a threaded oil sight glass with 1"1/8 – 18 UNEF connection. It can be used for visual check of oil The oil fill connection and gauge port is a 1/4" male flare connector incorporating a schrader valve. VSH compressors are equipped with rotolock oil equalisation connection. This connection is used when compressors are mounted in parallel. Contact Danfoss for further details. VSH170 are equipped with oil drain connection. This connection is a female ¼" SAE flare fitting, which allows oil to be removed for testing, replacement...
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Application Guidelines CDS302 frequency converter - enclosure B1 380-480 Volts - 15 kW - IP55 housing 525-600 volts - 15 kW - IP55 housing Mounting base
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Application Guidelines CDS302 frequency converter - enclosure B2 380-480 volts – 18-22 kW - IP55 housing 525-600 volts – 18-22 kW - IP55 housing Mounting base
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Application Guidelines CDS302 frequency converter - enclosure B3 380-480 volts - 15 kW - IP20 housing 525-600 volts - 15 kW - IP20 housing Scale 1:2 Min 200 Air space outlet Mounting base
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Application Guidelines CDS302 frequency converter - enclosure B4 380-480 volts – 18-22 kW - IP20 housing 525-600 volts – 18-22 kW - IP20 housing 200-240 volts – 15 kW - IP20 housing Mounting base
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Application Guidelines CDS302 frequency converter - enclosure C1 200-240 volts – 15-18-22 kW - IP55 housing scale 1:2 Min 200 Air space outlet Mounting base
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Application Guidelines CDS302 frequency converter - enclosure C3 200-240 volts – 18-22 kW - IP20 housing
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Application Guidelines Electrical data, connections and wiring Supply voltage Because VSH compressors are powered by a frequency converter, the mains frequency, 50 or 60 Hz, is no longer an issue. Only the mains voltage is to be taken into account. With 3 motor voltage codes, the most common mains voltages and frequencies are covered. Never connect the VSH compressor directly to the mains power supply. Compressor electrical specifications Voltage code Mains voltage range of drive RW: Winding resistance per winding (in CDS302 parameter list) RLA: Rated load current MMT: Maximum must trip current...
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Application Guidelines Electrical data, connections and wiring Wire sizes Below table lists recommended wiring sizes for the motor compressor power supply cables. These wiring sizes are valid for a cable length up to 20 m. It is not necessary to perform a Hipot test (dielectric withstand test) on frequency converters. This has already been done during factory final test. Ifa Hipot test has to be done anyway, following instructions must be followed in order to not damage the frequency converter: • LI, L2, L3, U, V, W terminals must be shorten and connected to high voltage terminal of • Ground...
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