Re: whole house central AC multi-zone

Mark Schofield wrote:

After having a contractor do manual J to determine the tonnage for AC in two bedrooms and a large family room, I would like to know the problems and issues if the system is to be zoned with individual stats and motorized dampers to control the bedrooms and/or the large family room, either individually or together. The tonnage was calculated for the entire load. If only part is being cooled, would a multi or variable fan be called for? Would the higher or lower air flow affect the refrigerant pressures? Would the capacity for the whole system be too much for only one zone thus affecting the dehumidification capabilities. Hopefully someone from alt.hvac will have some input. This will be a split system for cooling only. Heat is oil fired hot water. Thanks for any thoughts. Mark S.

You would do better with a two speed or variable speed compressor and a variable speed blower.
The evaporator will need to be fed by a TXV (Thermostatic Expansion Valve).

This is what I use:
http://www.udarrell.com/airconditioner_current_temperature_btuh_charting.html 


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Crank Your Air-Conditioner Up To Specs
http://www.udarrell.com/air-conditioner-capacity-seer.html
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Relevant Pages

  • Re: whole house central AC multi-zone
    ... >dampers to control the bedrooms and/or the large family room, ... The tonnage was calculated for the entire load. ... Air conditioners are sized to provide cycles with somewhat long duty time. ...
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  • Re: whole house central AC multi-zone
    ... > two bedrooms and a large family room, I would like to know the problems ... If you use A/C ... the whole house and keep it cool full time. ...
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