Quality Electrics Logo GIF Quality Electrics
24 Hour Emergency service within "our" geographic area as shown on the home page
HomeButtonRockdaleElectrician
ResidentialBardwellValleyElectrician
HomeSecurityMontereyElectrician
CommercialIndustrialKogarahElectrician
ConstructionSansSouciElectrician
ProgrammeMaintenanceDollsPointElectrician
TagandTestingBexleyElectrician
DataandCommsRamsgateElectrician
GreenEnergyCarltonElectrician
CBusTempeElectrician
JobPhotosHurstvilleElectrician
AboutUsWolliCreekElectrician
CustomerServiceBrightonLeSandsElectrician
TestimonialsSylvaniaWatersElectrician
 
ContactSandringhamElectrician
 DE - COMMISSIONING A SPLIT AIR SYSTEM

 

The topics are:-

  • Reasons for de-commissioning a system
  • Conditions that affect de-commissioning a system
  • Carrying out the de-commissioning a system

 

 

Reasons for de-commissioning a system :-

Why is it sometimes necessary to de-commission a split air conditioning system?

  • Replacement or upgrade of a system,
  • Relocation of the system or the outdoor unit,
  • Temporary disconnection of outdoor unit for alterations to the surrounding area.

There may be other reasons that a system is de-commission however whatever they maybe, the conditions and procedures are the same.

Conditions that affect de-commissioning a system :-

Generally, a system being de-commissioned requires either:

  1. The system pumped down so that the refrigerant charge is stored within the outdoor unit, or
  2. The refrigerant charge is reclaimed if the system is in-operative

It should be noted that the current version of HB40 Part 2 Systems other than self contained low charge systems states that ‘all refrigerant must be reclaimed from all parts of the system at the time of decommissioning, unless the system is being decommissioned for service or immediate re-commissioning’. In essence, a system that is to be de-commissioned for an extended period of time requires the refrigerant charge be reclaimed and the system charged with a dry nitrogen holding charge.

 

Carrying out the de-commissioning a system :-

The procedures in de-commissioning a split air conditioning system are relatively simple. If the system is operative, then provided the system has service valves, it is generally a simple case of pumping the system down. Essentially, to pump a system down, the following steps should be taken:

  • Service gauges be fitted – specifically the compound gauge to the suction service valve.
  • It should be remembered that to pump a system down, it must be operating in a cooling mode. In a summer period, this is relatively simple. However, to do this in a winter period may be difficult. To overcome this, some systems (wall mounted systems) have a "pump down‟ button on the PC board in the outdoor unit. This forces the system to operate in a cooling mode regardless of what the controller is telling the system to do. Where systems don‟t have this function, the room temperature sensor may need to be heated to simulate a cooling requirement.
  • Once the system is running in a cooling mode, the liquid line service should be closed. The suction pressure should be monitored and once the pressure reaches slightly lower than atmospheric pressure (say -5kPa) then the system should be shut down. If the pressure rises rapidly, this is an indication that there may be still residual refrigerant in the compressor crankcase.
 

Restart the system and again pump the suction pressure down to -7 kPa and shut the system down. If the pressure remains at that point or rises very slowly, close the liquid line service valve and tag off or unplug the electricity supply.

  • If the refrigerant charge is to be reclaimed, this should be done according to the procedures outlined in the Learner Resource Manual UEENEEJ072A – Fundamental concepts and refrigerant handling for split air conditioning systems.
  • The system is now ready for disconnection.
 

Once the fan-coil unit has been disconnected, if it is to be re-used, then the piping connections should be quickly sealed to prevent the infiltration of moisture. Additionally, the outdoor unit suction and liquid service valve flares should be capped.

Finally, the system should be tagged or labelled indicating its status; so that in future it is known what condition the unit is in and what will be required to re-install the system.

IF YOU WANT KNOW MORE - JUST SEARCH...

 

 
 

This page was last modified on 6th June 2010 and maybe out of date with regards to its information at the time of reading this article. The information above is only intended for use a guide and should not be 100% relied upon as a substitute for official manufacturer technical advice. Quality Electrics disclaims responsibility for any damage, claim, or liability any person may incur, whether caused by negligence or otherwise, as a result of anything contained in our articles.
 

 
 
 

Share this article TV Antenna Repairs Rockdale Split Air Systems Brighton le Sands electrician Split Air Systems Bexley electrician TV Antenna Repairs Carlton Split Air Systems Sylvania electrician TV Antenna Repair Sans Souci Split Air Systems Beverley Park electrician TV Antenna Repairs Kogarah

 

 

 
 
About this Website / Privacy / Links

Copyright Quality Electrics| tel: +61 (2) 8509 5633 | fax: +61 (2) 9819 7241

Mobile for emergencies - 0410 4949 24

EmailAddress

Brighton Le Sands electrician, Rockdale electrician, Turrella electrician, Wolli Creek electrician, Carlton electrician, Sydenham electrician, Carrs Park electrician, Allawah electrician, Earlwood electrician, Arncliffe electrician, Sans Souci electrician, Banksia electrician, BeverleyPark electrician, Monterey electrician, Tempe electrician, Hurstville electrician, Sandringham electrician, Kingsgrove electrician, Mascot electrician, Botany electrician, St.Peters electrician, Bardwell Valley electrician, Marrickville electrician, Dolls Point electrician, Ramsgate electrician, Bexley electrician, Kogarah electrician, Kogarah Bay electrician, Sylvania Waters electrician,electrician Brighton Le Sands, electrician Rockdale, electrician Turrella, electrician Wolli Creek, electrician Carlton, electrician Sydenham, electrician Carrs Park, electrician Allawah, electrician Earlwood, electrician Arncliffe, electrician San Souci, electrician Banksia, electrician Beverley Park, electrician Monterey, electrician Tempe, electrician Hurstville, electrician Sandringham, electrician Kingsgrove, electrician Mascot, electrician Botany, electrician St.Peters, electrician Bardwell Valley, electrician Marrickville, electrician Dolls Point, electrician Ramsgate, electrician Bexley,electrician Kogarah,electrician Kogarah Bay, electrician Sylvania Waters,