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Active Contributor

Join Date: Nov 2007
Posts: 18

Split type Air conditioner

08/13/2008 1:57 AM

Please give me an additional recommendation regarding this problem.

The reviewer approved the material specifications submittal and the contractor already purchased the ACU but the unit must be rejected because of the working conditions. Since in iraq the maximum outside temperature is 50 degrees celcius.

* When outdoor temperature is more than 43 deg C or lower than 18 deg C (dry temperature) the air-conditioner can't operate Cooling mode.

Reviewer Comment:

The Reviewer overlooked the working conditions specified on the MSS of the A/C units however as a final check before the unit is to be given a REJ determination it should be understood that all mechanical equipment have extra capacity ranging from 10 % to 15 % and the actual capacity of the A/C unit is therefore should be equal to 1.1 to 1.15 times the A/C unit specified capacity times the de-rating factor attributable to the latter cited incapability of the unit to normally operate above 43 degree Celsius.

Therefore the Reviewer is requesting MSS containing the de-rating factor of the A/C unit to distinguish the tolerance of the equipment regarding the maximum outside design dry bulb temperature. If the maximum outside db temperature cannot accommodate the dry bulb temperature of the outside condition therefore the unit should be rejected.

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Guru
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Join Date: Nov 2007
Location: Christchurch, (The Garden City), South Island, New Zealand
Posts: 4395
Good Answers: 230
#1

Re: Split type Air conditioner

08/13/2008 6:10 AM

Hello bibo

You do not say whom the Reviewer is paid by:

  1. The Architect or Engineer who put out the works to tender
  2. The Tenderer
  3. The Main (Head) Contractor
  4. The Air-Conditioning Subcontractor
  5. The Army
  6. The Seller of the Air-Conditioning equipment, which will not properly work in Iraq
  7. Other - Specify please

Reading the information in your Post, because that Air-Conditioner as supplied will not work at more than 43 degrees Celsius, and the temperature in the intended installation position exceeds that 43 degrees Celsius almost every day, there is only the single conclusion to be made:

The Air conditioner unit is not satisfactory, and should be replaced at the cost of whomever made the error, either because the Specification was incorrect = Specification Writer pays), or the A/C equipment Supplier if the A/C unit specification was correctly written (as it appears from your Post), and not properly understood.

In short, both the Persons who write Specifications, and Equipment Suppliers are rated as "Experts", who should know their responsibility under Contract Law.

Thus whoever made the error, wherever they are in the chain of events, is the party which pays for that error.

Partial recovery of the costs, may be made by the Party which made the error, on-selling that A/C unit elsewhere, another Country or Location, which location is within the operational temperature range, etc. of the design specifications of the A/C unit.

Hope that assists you.

Kind Regards....

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Power-User

Join Date: Mar 2007
Location: South East of Las Vegas just far enough to see the lights but far enough to not hear the coins falling
Posts: 282
Good Answers: 8
#3
In reply to #1

Re: Split type Air conditioner

08/13/2008 11:21 PM

From the field;

I have an opinion that there is something wrong with the installation or the A/C set-up. In Las Vegas if I specify an A/C unit I always request a unit that will operate at 46*c. Most standard A/C unit are rated for 35*c. Having said that I would go through some basic system trouble shooting and find out why "it won't work" at 43*c. It should work to a point. A good working (clean unit with clean filters) should have a -6.6*c (20*f) delta across the system. I hope I express the c value correctly. Cat please help me here.

I would ask

Are both coils clean?

Is the filter (s) clean?

Are the indoor and outdoor fans running at the proper speed?

Is it possible that the amp draw is low because your applied voltage may be wrong?

How large is your unit? If you get stuck with it let me know maybe I can buy it from you?

Mike

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Guru

Join Date: Feb 2006
Location: Piney Flats, Tennessee
Posts: 1740
Good Answers: 23
#2

Re: Split type Air conditioner

08/13/2008 11:10 PM

SHADE THE OUTSIDE UNIT OR IT WILL FREEZE UP RIGHT?

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