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Mitsubishi mini split unprecise thermostat alternatives?

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Kham

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Discussion starter · #1 ·
Hi, I just had 2 Mitsubishi head units (two MSZ-GL12NA link with one MXZ-2C20NA2) installed at my home.

Unfortunately, the temp sensor of one of the unit is very unprecise. I am aiming to heat the house at 23c or 73F, and to obtain it I must set the remote to 26c or 79f. When set higher, sometimes even if the right temperature is achieved, the unit will continue to heat at a high fan speed reaching a temp of 24c or 75f.

I would like to add an external thermostat to resolve the problem and achieve much more steady heating cycles.

What would the easiest option to do so? Is the Mitsubishi MHK1 thermostat compatible with my setup? Is it the simplest wireless option?

I don't need to control the 2 head units, I just need to be able to control the ground floor one.

I already have a smart Ecobee thermostat hooked up to my electric furnace but the C wire is already used.

I have also read about the Honeywell alternative but I understood that it needs to be hooked up to some other smart device as well?

Sorry if I am a little unclear, I only would like to know if any "easy" options exist to my problem.

Thank you very much and have a very nice day!
 
#3 ·
The MHK1 is compatible if you can still find them. If not the new one is the MHK2. As pecmsg said, don't worry too much about the numbers on the remote just pick something you're comfortable with.
 
#4 ·
pecmsg said:
Ive found with Mini Splits find a spot thats comfortable to you not what the #'s say. Set them and forget them! leave them in auto!
Click to expand...
Agree with the first sentence.

Disagree with the second sentence. In the manuals of many of these units, the AUTO mode must see a deviation of 4° from set point to activate. For example, set point is 75°. In AUTO, the actual temp would have to drop to 71° to activate heat and rise to 79° to activate cooling.

As long as this is taken into consideration, AUTO mode is fine.
But, if you want precise, set it in the mode you desire and it will, if everything is working to mfr specs, maintain a 1° differential from set point.
 
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#5 ·
pacnw said:
Agree with the first sentence.

Disagree with the second sentence. In the manuals of many of these units, the AUTO mode must see a deviation of 4° from set point to activate. For example, set point is 75°. In AUTO, the actual temp would have to drop to 71° to activate heat and rise to 79° to activate cooling.

As long as this is taken into consideration, AUTO mode is fine.
But, if you want precise, set it in the mode you desire and it will, if everything is working to mfr specs, maintain a 1° differential from set point.
Click to expand...
Agreed

Auto being fan and louvers.

Manually switch ver from heat / cool! :cheers:
 
Discussion starter · #6 ·
Yesterday the mini split was set to 25c and maintained 22.5c steady all evening (exactly the temp I was aiming for). This morning when I woke up, the temp was 21.5. Why?
 
Discussion starter · #10 ·
Absolutely lol. 1.8F variation. I just wanted to know if it was normal since it's the second night that this exact same variation happens. Very very steady temp all evening, and the same drop in the morning.
 
#12 ·
Take a temperature near the wall mount unit and see if it's closer to what your setpoint is. It may just be satisfying or maintaining because it thinks it's close to set point.
 
#13 ·
Where and what are you using to read temps. Wall mount heads sense temps at the head, so if the temp is higher closer to the ceiling that would explain temp fluctuations.
You could use the Honeywell universal wireless thermostat for minisplits but you would loose modulation functions.


Sent from my iPad using Tapatalk
 
#14 ·
The indoor sensor can be compensated via the remote control, having the unit act in a different fashion than factory, to solve your problem.
 
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Freezeking2000
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