Mini-Split Cooling Capacity

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  #1  
Old 08-15-09, 03:01 PM
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Mini-Split Cooling Capacity

I just purchased a Sanyo CM1972 which is describe here:
Sanyo CM1972 19,700 BTU Multi-System Cooling Only Ductless Split Outdoor Unit with DC Inverter, Microprocessor Control and Auto Fan Speeds

The Cooling Capacity for this outdoor unit is 19,700 btu/h

The available indoor units are 7,500 btu, 9,000 btu, 11,900 btu, and there are two larger units.

I would like to have 3 indoor units for the different areas of my home but I am not sure what the total btu's of the indoor units can total. I initially assume that the BTU's of the indoor units could not exceed 19,700, since that is the cooling capacity of the outdoor unit.

However, most ads for the outdoor unit CM1972 say that the indoor units can not exceed 130% of the outdoor unit, which would be about 25,600 BTU's.

In addition, the service manual for the CM1972 says that it can handle indoor units up to 200% of its 19,700 capacity, which is about 39,400 BTU's. See below pages 89 and 90.
http://www.pexsupply.com/specsheet/S...ice-Manual.pdf

Is anyone able to clarify this? Because I would like to get a 11,900 to go with the 7,500 and 9,000 I already have in the bedrooms. However, that would take my indoor units to 28,400 which is about 144% of the outdoor unit.

Any help would be appreciated. Thanks
 
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Old 08-16-09, 09:11 AM
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You must refer to the manufacturer's detailed specs.

I am familiar with the LG line, and they provide very detailed charts about the combination of indoor units which may be used on a particular outdoor unit.

The inverter technology flex compressor is what allows a total btu greater than the "rated" size of the outdoor unit.
 
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Old 08-16-09, 07:31 PM
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Thanks for the feedback. I found a Sanyo number to call for some detailed information.

The person who was going to install it was giving me conflicting information, so I want to confirm what can be installed before I allow it to happen.
 
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Old 08-17-09, 09:09 AM
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I have a fujitsu 24000 btu dual zone and it does a large bedroom very well (one 12000 btu indoor unit) but the other unit (also 12000 btu) barely helps out for a living room/dining room area.

I hope the 3 areas you are trying to cool with only 19K btus are all relatively small or I feel you'll probably be disappointed.
 
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Old 08-17-09, 08:43 PM
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Well, I only purchased the unit for one area, but then the techs realized that with the CM1972 that you need at least 2 indoor handlers connected, so I had them throw the 7.5 in my bedroom.

I found out that it would be best if I put a 17,500 unit in my livingroom because the current 9,000 is not working effectively. However, to do this I would have to sell the 9,000 on ebay or something and take a little loss.

If I do this, then I would have a 17,500 in the living room and a 7,500 in my bedroom. With my current understanding, I will scrap the 9,000 in the 3rd room idea.

However, if I have them both running at the same time the 17,500 will de-rate itself to about 13,500 BTU's and the 7,500 will de-rate to about 6,000 BTU's, which is still fine for me.

In the 3rd room I will continue with a window unit.

Thanks again for the feedback.
 
 

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