Question about Mitsubishi MSZ09UN Air Conditioner

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Wiring Do i need to hook up S3 on the indoor and outdoor if the unit is ac only.

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Yes, S3 is the comm wire and it needs to be connected.
S1 Is Active
S2 Is Nuetral
S3 Is your talking wire if that makes any sense

Posted on Jan 10, 2009

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Posted on Jan 02, 2017

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How do i deal with the dripping of water from my Mitsubiishi split system from inside unit? Will putting the unit on 19 and then turning it full bore clear over condensing?


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I need to know if a mercury thermostat is bad will it allow the ac to come on but not the heater


need to know what thermostat you are referring to
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1 Answer

Why can't I lower my honeywell 8500 below 67 on cool?


With a two story house you have to be aware that cold air flows downwards so any cold air coming from an ac unit will flow downstairs( normally down the stairway) so unless you can close off the down stairs then the up stairs unit will be cooling downstairs as well. Ac units have a thermostat located in the air intake and it cools until the cold air has risen to that point. In effect the space above the ac unit will be hotter than the floor. Knowing how they work ,you can see that the upstairs unit will never reach the set temperature because the cold air is continually heating from the house and will never get to the top thermostat.
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Water dropping on air conditioner


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If you are in the market for an Air Duct cleaning check out Air Duct Cleaning Dallas Tx.

Jun 10, 2012 | Heating & Cooling

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