Continuous fan can be annoying and even cause overshooting in multi systems. I would contact your installer and ask them to help with the setup. You don't want to mess with something without ensuring the design won't change. They should be able to point you in the right direction in order to access installer configuration. The settings may be set for different sensing locations. So, if you change the continuous air flow to off, you may not sense the temperature in the correct location. This is something that your installer will help walk you through, as they know how they set up the equipment.

 

Fan usually runs continuously because the temperature is sensed at the head unit and NOT the thermostat.

 

He said ducted unit....should be at the stat if programmed correctly.

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The MHK2 has the ability to use the stat, the air handler R/A sensor, or a combination of both.

 

If it's truly on a City Multi unit the MHK2 can't set function codes because all of that is done with dip switches inside the unit. Out of the box they sense temperature at the return air sensor and run continuous low speed fan.

 

I default to your expertise on the Mitsu's! utergreet:
Curious, if this is a true City Multi in a residential application, or an M-series multi-split?

 

Thanks Everyone—very helpful,

I think Flyersfan has it. I found a Mitsubishi fan setting application note that details the options for stoping the fan. Should I set the Dip switches as noted on page 11 to On,On,On? Also, what good is a thermostat if the system senses temperature at the return air sensor that’s in my air handler in the garage? If I understand this air sensor location correctly.

Also, my mistake—it’s a SmartMulti.

I can’t post links yet (need 7 posts!!! So I cut the HTTP



enter.mehvac.com.s3.amazonaws.com/DAMRoot/Original/10006/Application%20Note%203048%20ME%20-%20How%20to%20turn%20off%20indoor%20unit%20fan%20when%20set%20point%20is%20met.pdf#page4

 

SmartMulti on my side yard, residential. Air handler in my garage

 

The Smart Multi can work with all of Mitsubishi's indoor unit lines: M, P, and City Multi. Nobody can advise without knowing the model number of your indoor unit. That said, since this is a ducted system, and nothing is showing up in the configuration menu, it's probably a safe assumption the indoor unit is a City Multi, and so uses the DIP switch settings.

 

Yes the indoor unit is a CityMulti model PVFY-P48NAMU-E1.

 

Those are the correct dips for turning off continuous fan, but if you're going to using them you need to change the temperature sensing location from the return air to the MHK2 using another dip switch. Not sure if setting dips is too DIY or not so I'll just say that the switch setting for that is in the indoor unit service manual.

 

Ok,
I found the Service Manual and these are the DIPs I believe I need to change to ON to shut the fan off. Can you please confirm before I access the board in the indoor unit? Thanks again!

 

Hi All,
Not trying to beat this to death but just want to final confirm turning on SW1-1,SW1-7, SW1-8, SW3-1 turns off fan. Thanks!