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Routine Outdoor Helium Compressor Maintenance
Introduction
Every month of operation the outdoor compressor of the HAC4500 will need to be thoroughly
cleaned and serviced to ensure many years of reliable operation. This maintenance is best performed
by a trained Heat, Ventilation and Air Conditioning (HVAC) technician or building facility
personnel.
In practice, the HAC 4500 maintenance should be accomplished in approximately 1.5 hours and will
not require the PPMS EverCool II system to be warmed up. This Service note can be used as a
guideline for an HVAC technician to familiarize himself with the different routine maintenance
requirements of the HAC 4500 outdoor helium compressor.
Tools Needed
o Medium size Philips screwdriver
o Water Hose
Parts Needed
o Spare 8-32 screws (zs-8csm.38tp)
I.
Scheduling a maintenance event
In the PPMS EverCool II the most evident symptom that Cold Head maintenance might need to
be performed is that the system will not be able to maintain a constant liquid helium level.
II.
Shutting down the system for Service Maintenance
The Outdoor Compressor unit maintenance should be scheduled every 2500 hours of operation
or when overheating of the compressor capsule is observed. The maintenance can be
accomplished in just about two hours and should not require the PPMS EverCool II system to be
completely warmed up.
1. Set the system in standby mode from MultiVu by clicking Instrument
OK.
2. Power down the indoor compressor by toggling the switch in the back of the indoor unit.
3. Power down high voltage power by turning off the high voltage breaker. WAIT FOR 30
MINUTES BEFORE PROCEEDING TO THE NEXT STEP!! This will allow all the
capacitors in the compressor discharge to a safe level before opening the fuse bay.
Quantum Design
HAC 4500 Service Note 1201-022
Instructions
Service Note 1201-022, Rev. A0
November 2, 2011
Shutdown
click
1
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Summary of Contents for Quantum Design HAC 4500
- Page 1 Heat, Ventilation and Air Conditioning (HVAC) technician or building facility personnel. In practice, the HAC 4500 maintenance should be accomplished in approximately 1.5 hours and will not require the PPMS EverCool II system to be warmed up. This Service note can be used as a guideline for an HVAC technician to familiarize himself with the different routine maintenance requirements of the HAC 4500 outdoor helium compressor.
- Page 2 Figure 2. Wash the compressor air filter screens with a water hose 3. Let the filters dry while accomplishing the other maintenance tasks. Service Note 1201-022, Rev. A0 Quantum Design November 2, 2011...
- Page 3 Figure 4. Remove the compressor side panels 2. Make sure the electronics bay is free of debris. Dirt and other obstructions might be limiting the air ventilation through the louvers. Quantum Design Service Note 1201-022, Rev. A0 November 2, 2011...
- Page 4 Please note that no water should be directed or otherwise enter through the electronics bay vents. This could cause malfunctioning of the equipment!! Figure 6. Wash the bottom shelf of the compressor unit Service Note 1201-022, Rev. A0 Quantum Design November 2, 2011...
- Page 5 C:\QDPPMS\QDTools\CANDataLogger and open the program. o Press the “Initialize CanOpen Master” button to initialize the CAN bus communications. o Click on File and open the EvercoolII.cdl file in the C:\Evercool II\Tools directory. Quantum Design Service Note 1201-022, Rev. A0 November 2, 2011...
- Page 6 4. If you have lost too much Liquid Helium (below 60%), wait for the system to refill to above 60% before using the magnet and temperature control. The status should be in “Recirc. & Filling” if it is below that level. Contact a qualified Quantum Design representative for assistance if need be. Service Note 1201-022, Rev. A0...
- Page 7 300 K, the equipment automatically opens the valves and starts pumping out the lines. 6. Wait five minutes for the system to stabilize. 7. Set a new temperature and activate an option. Quantum Design Service Note 1201-022, Rev. A0 November 2, 2011...