FREE ENGLISH DANFOSS DSN120 (01) PDF USER GUIDE
FREE ENGLISH DANFOSS DSN120 (01) PDF USER MANUAL
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FREE ENGLISH DANFOSS DSN120 (01) PDF OWNER MANUAL
FREE ENGLISH DANFOSS DSN120 (01) PDF REFERENCE GUIDE
FREE ENGLISH DANFOSS DSN120 (01) PDF INSTRUCTION GUIDE
FREE ENGLISH DANFOSS DSN120 (01) PDF REFERENCE MANUAL
FREE ENGLISH DANFOSS DSN120 (01) PDF INSTRUCTION MANUAL
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DANFOSS DSN120 (01) PDF SUMMARY:
What are the Danfoss scroll compressors DSN120-180 used for?
These compressors are used for air-conditioning systems.
What refrigerant is used in model DSN180A4ALA?
R290
What does the operating envelope data for DSN guarantee?
The Operating envelope data for DSN guarantees reliable operations of the compressor for steady-state operation.
What is the valid suction superheat for the area of the operating map where the evaporating temperature is below 5°C?
The envelope left area (Evaporating temperature below 5°C) is valid for min suction superheat 5K(9°F).
What is the valid suction superheat for the area of the operating map where the evaporating temperature is above 10°C?
The right area (Evaporating temperature above 10°C) is valid for min suction superheat 10K(18°F).
What is the valid suction superheat for the area of the operating map where the evaporating temperature is between 5°C and 10°C?
Between areas, min suction superheat can be controlled between 5K(9°F) and 10K(18°F).
What may happen if there is a high suction superheat?
Higher suction superheat may lead to discharge temperature above 150°C for DSN with R290.
What is the maximum discharge gas temperature for the DSN?
The discharge gas temperature must not exceed 150°C.
Under what condition may the compressor be used and what guidelines should be consulted?
The compressor must only be used for its designed purpose(s) and within its scope of application. Consult Application guidelines and datasheet available from cc.danfoss.com.
What regulation requirements must be fulfilled?
Under all circumstances, the EN378 (or other applicable local safety regulation) requirements must be fulfilled.
What is the delivered pressure of the compressor and how should it be handled?
The compressor is delivered under nitrogen gas pressure (between 0.3 and 0.7 bar) and hence cannot be connected as is. The compressor must be handled with caution in the vertical position (maximum offset from the vertical: 15°).
How should the compressor be handled?
Handle the compressor with care. Use the dedicated handles in the packaging. Use the compressor lifting lug and use appropriate and safe lifting equipment.
How should the compressor be stored and transported?
Store and transport the compressor in an upright position. Store the compressor between Ts min and Ts max values for LP side indicated on the compressor nameplate. Don’t expose the compressor and the packaging to rain or corrosive atmosphere.
What safety measures should be taken before assembly?
Never use the compressor in a flammable atmosphere. Check before assembly that the compressor does not show any obvious signs of deterioration that could have occurred during inappropriate transportation, handling, or storage.
What is the maximum ambient temperature of the compressor during the off-cycle?
The compressor ambient temperature may not exceed Ts max value for LP side indicated on the compressor nameplate during the off-cycle.
How should the compressor be mounted?
Mount the compressor on a horizontal flat surface with less than 3º slope.
What should be verified before assembly of the compressor?
Verify that the power supply corresponds to the compressor motor characteristics (see nameplate).
What type of equipment should be used when installing DSN compressors?
When installing DSN, use equipment specifically reserved for HC refrigerants that was never used for CFC or HCFC refrigerants.
What kind of tubes and brazing material should be used?
Use clean and dehydrated refrigeration-grade copper tubes and silver alloy brazing material. Use clean and dehydrated system components.
How should the piping connected to the compressor be?
The piping connected to the compressor must be flexible in 3 dimensions to dampen vibrations.
How must the compressor be mounted?
The compressor must be mounted on rails or chassis according to Danfoss recommendations.
How should the nitrogen holding charge be released?
Slowly release the nitrogen holding charge through removing the suction plug first, remove the discharge plug afterwards.
When should the compressor be connected to the system?
Connect the compressor to the system as soon as possible to avoid oil contamination from ambient moisture.
What should be avoided when cutting tubes?
Avoid material entering into the system while cutting tubes. Never drill holes where burrs cannot be removed.
How should brazing be performed?
Braze with great care using state-of-the-art technique and vent piping with nitrogen gas flow.
What should be connected after brazing?
Connect the required safety and control devices.
What should never be used to pressurize the circuit and why?
Never pressurize the circuit with oxygen or dry air. This could cause fire or explosion.
How should the system be pressurized during leak detection?
Pressurize the system on the HP side first and then on the LP side. Never let the pressure on the LP side exceed the pressure on the HP side with more than 5 bar. Such pressure differences could cause internal compressor damage.
What should not be used for leak detection?
Do not use dye for leak detection.
How should a leak detection test be performed?
Perform a leak detection test on the complete system.
What is the maximum test pressure?
The test pressure must not exceed 1.1 x PS value for LP side and PS value for HP side indicated on the compressor nameplate.
What should be done when a leak is discovered?
When a leak is discovered, repair the leak and repeat the leak detection.
What should never be used to evacuate the system?
Never use the compressor to evacuate the system.
To what sides of the system should a vacuum pump be connected?
Connect a vacuum pump to both the LP & HP sides.
To what vacuum level should the system be pulled down?
Pull down the system under a vacuum of 500 µm Hg (0.67 mbar) absolute.
What should not be used or done while the compressor is under vacuum?
Do not use a megohmmeter nor apply power to the compressor while it is under vacuum as this may cause internal damage.
What should be done before making electrical connections?
Switch off and isolate the main power supply.
What must be selected as per local standards and compressor requirements?
All electrical components must be selected as per local standards and compressor requirements.
In what direction does the compressor work correctly?
The Danfoss scroll compressors only work correctly in one rotation direction.
How should the line phases be connected to the compressor terminals?
Line phases L1, L2, and L3 must absolutely be connected to compressor terminals T1, T2, and T3 to avoid reverse rotation.
What size of screws and ring terminals should be used for the power connection and what torque is used to secure them?
Use Ø 4.8 mm (3/16") screws and 1/4" ring terminals for the power connection. Fasten with 3 Nm torque.
How the compressor should be grounded?
The compressor must be connected to earth with the 5 mm earth terminal screw.
How should the system be filled with refrigerant?
Keep the compressor switched off. Fill the refrigerant in liquid phase into the condenser or liquid receiver. The charge must be as close as possible to the nominal system charge to avoid low-pressure operation and excessive superheat.
What is the maximum pressure difference that should occur between the LP and HP sides while filling the system?
Never let the pressure on LP side exceed the pressure on HP side with more than 5 bar. Such pressure difference could cause internal compressor damage.
What are the considerations about refrigerant charge? Keep the refrigerant charge below the indicated charge limits if possible.
How should the compressor be protected against liquid flood-back?
Above this limit; protect the compressor against liquid flood-back with a pump-down cycle or suction line accumulator.
What should never be left connected to the circuit while filling the system?
Never leave the filling cylinder connected to the circuit.
What is the refrigerant charge limit for the DSN120?
4.2 kg
What is the refrigerant charge limit for the DSN150?
4.2 kg
What is the refrigerant charge limit for the DSN180?
4.4 kg
What safety devices should be used and how should they be checked?
Use safety devices such as safety pressure switches and mechanical relief valves in compliance with both generally and locally applicable regulations and safety standards. Ensure that they are operational and properly set. Check that the settings of high-pressure switches and relief valves don’t exceed the maximum service pressure of any system component.
What is recommended to avoid vacuum operation?
A low-pressure switch is recommended to avoid vacuum operation.
What is the Minimum setting for DSN low-pressure switch?
- 5 bar g.
How should electrical connections be verified?
Verify that all electrical connections are properly fastened and in compliance with local regulations.
When should a crankcase heater be energized?
When a crankcase heater is required, it must be energized at least 12 hours before initial start-up and start-up after prolonged shutdown for belt-type crankcase heaters.
What should never be done about the electrical box cover?
Never operate the compressor without the electrical box cover fitted.
What is the operational state of the compressor if there is no refrigerant?
Never start the compressor when no refrigerant is charged.
What position must all service valves be in?
All service valves must be in the open position.
How should the HP/LP pressure be?
Balance the HP/LP pressure.
What should happen when the compressor is energized?
Energize the compressor. It must start promptly.
What to do if the compressor doesn’t start when energized?
If the compressor does not start, check wiring conformity and voltage on terminals.
How can eventual reverse rotation be detected?
Eventual reverse rotation can be detected by the following phenomena; the compressor doesn’t build up pressure, it has abnormally high sound level and abnormally low power consumption.
What to do If a reverse rotation occurs?
In such a case, shut down the compressor immediately and connect the phases to their proper terminals.
How are the Danfoss DSN scroll compressors protected against reverse rotation?
Danfoss DSN scroll compressors are protected against reverse rotation either by an internal reverse rotation protection. They will shut off automatically.
What happens if the internal overload protector trips out? If the internal overload protector trips out, it must cool down to 60°C to reset.
How long could it take the overload protector to reset?
Depending on ambient temperature, this may take up to several hours.
What should be checked with the running compressor?
Check current draw and voltage. Check suction superheat to reduce the risk of slugging.
How should the oil level be observed?
Observe the oil level in the sight glass for about 60 minutes to ensure proper oil return to the compressor.
What limits should be respected?
Respect the operating limits.
What to check regarding vibrations, what do abnormal vibrations require?
Check all tubes for abnormal vibration. Movements in excess of 1.5 mm require corrective measures such as tube brackets.
What should be done if additional refrigerant is required?
When needed, additional refrigerant in liquid phase may be added to the low-pressure side as far as possible from the compressor.
What is the operational state of the compressor while adding refrigerant?
The compressor must be operating during this process.
What should be avoided when adding refrigerant?
Do not overcharge the system.
Where should the refrigerant never be released?
Never release refrigerant to the atmosphere.
What should be ensured for reversible systems?
For reversible systems, ensure that the 4-way valve does not reverse when the compressor is stopped due to heating or cooling demand (stop on thermostat)
What should be done before leaving the installation site?
Before leaving the installation site, carry out a general installation inspection regarding cleanliness, noise, and leak detection. Record type and amount of refrigerant charge as well as operating conditions as a reference for future inspections.
What are the dangers associated with internal pressure and surface temperature?
Internal pressure and surface temperature are dangerous and may cause permanent injury. Maintenance operators and installers require appropriate skills and tools.
What is the maximum temperature that tubing may reach?
Tubing temperature may exceed 100°C and can cause severe burns.
What is required by local regulations to be preformed?
Ensure that periodic service inspections to ensure system reliability and as required by local regulations are performed.
What periodic maintenance is recommended to prevent system-related compressor problems?
- Verify that safety devices are operational and properly set.
- Ensure that the system is leak tight.
- Check the compressor current draw.
- Confirm that the system is operating in a way consistent with previous maintenance records and ambient conditions.
- Check that all electrical connections are still adequately fastened.
- Keep the compressor clean and verify the absence of rust and oxidation on the compressor shell, tubes, and electrical connections.
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