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Air Conditioner power rating

We have a Rinnai REC 500, several years old.

1. In terms fo how air conditioning is rated now, what is the equivalent power rating (kW) of this machine?

The room is 7.6m X 5.5m X 2.4m(ceiling) and the A/C doesn't seem adequate on really hot days.

2. What is optimum output rating for a room that size?



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  • JPW1 Nov 25, 2007

    So, have you any answers to my question?

    1. In terms of how air conditioning is rated now, what is the equivalent power rating (kW) of this machine?

    I'm not getting the relationship between BTUs and KWs.



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Your room should be handled well by a 12000 BTU unit.

Posted on Nov 24, 2007

  • Greg Stokes
    Greg Stokes Nov 24, 2007

    To add you have over 41 Square meters, so you will need over 3.5KW to cool it. This should be bigger than 12000 BTU like I said earlier.

  • Greg Stokes
    Greg Stokes Nov 25, 2007

    1 Ton equals 12000 Btu equals 3.5KW. I cannot find any information on the Rinnai REC500. From the model number, I can only assume it is 0.5 ton or 6000 BTU. Where REC1000 according to my assumption would be 1 Ton, 12000 BTU, and 3.5KW. I calculated your Square meterage to be about 42 Sq. Meters. 12000 BTU is good for 37 Sq meters. In all honesty I believe you should look at the label on the Rinnai and see what the actual Kw Rating is. If it is less than 3.5 KW then it is not enough. If you look at the relationship between 3.5KW and 37 Sq. Meters, then 4 KW should work on 42 Sq. Meters. I hope this helps you. I have dug up a lot of info to cover this Solution. Basically if you go with a 4.5 Kw, that will be overkill.



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