Difference Between Mitshubishi MSZ-FS06 and MSZ-FS09 Outputs
Hi All,
I am looking at having a contractor replace a currently oversized mini split with a new one. I am looking at the submittals for both FS06 and FS09. They both have the same minimum outputs, but the FS09 has a higher heating capacity at lower temps.
Is there any harm in going with the FS09 to have the higher heating BTUs during a couple of extremely cold days? 99% temp is 9F, but it does dip to below zero for a few days. I have load calcs for the room but didn’t know if there is any harm in going to the 09 since they both can turndown to the same minimum output. The 06 unit would cover the loads, but it would top out at the maximum during very cold days. If the room’s door is left open, it would not really help the load of the next door room due to limited capacity. Design temps for cooling are around 90F.
I do not want to oversize this, and wanted your opinions since the installing contractor already made an issue with oversizing it the first time.
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Replies
Do people think it is the same unit and just a different board?
Are there any downsides to going with the 9k over the 6k if they both can modulate down to the same BTUHs?
Thanks.
I see no downside from a performance standpoint going with the 9k unit. I haven’t looked closely at the technical specifications, but it wouldn’t surprise me if it was the same hard ware with different controls.
I'm pretty sure they are the same. Identical indoor and outdoor unit weights are a giveaway.
Not sure why they bother with the two part numbers, almost everything about the two units is the same.
Thanks for the input. That was my thought. I don't see a negative with the 09 in a colder climate. You get the extra heat BTUs, but the low modulation down. This comes at a small efficiency price.
I'm thinking it is just a different board? The tech specs show all operational aspects to be identical.
THe major difference is the operating frequency for the 06 - this may also be to just have a higher COP and SEER offering?
I would look at it another way.
If you can get the 06 for less money, I would go for that since it is the same unit. Your install should charge you less since they are a fair bit cheaper.
It will take a very large or leaky room to have anywhere near the one ton of heating load the 06 provides, the extra bit of heat the 09 provides is pretty much noise anyways.
That's an interesting take. My thought was to have the extra BTUs help with the neighboring entry way as I normally leave the door open. Do you think that is not advantageous? I am trying to eliminate an entire zone of my oil boiler - which is the room the unit is in and the entry way.
Curious on your input. Thanks!
I am curious what prices you are getting for full install? ..
It's most certainly the same unit. Most manufacturers use the same compressor/outdoor unit and its software driven on btu outputs.
I wouldn't worry about short cycling. Did you see the minimum wattage on those units? Even if they short cycle your talking a few hundred watts. The efficiency on these high efficiency single zone units is absurd.
I confirmed all these electricity numbers on my Emporia Vue electricity monitor. The Mitsubishi seems to have similar numbers. My Gree 9k sapphire (38 seer 15 hspf) can turn down to and run at an insane 50 watts with the compressor running. I confirmed this with an Emporia Vue and was a amazed that the compressor was running and it was using less than. 100 watt incandescent light bulb.
I tried to calculate that COP
https://ashp.neep.org/#!/product/25405/7/25000///0