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379 posts

Ultimate Geek
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Topic # 126818 20-Jul-2013 21:43
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Hi there,
I have a Daikin 2.5kW split (model FTXS25LVMA). I am not sure if the brand new system I have just installed, functions properly. I also have a Mitsubishi Heavy Industries 7kW split (in Lounge, installed 3 years ago) and I expected the behavior to be the same. Here is what I want to clarify:

When the MHI is set on a certain speed (not auto), that speed does not change regardless how far you are from the set point. It is the compressor output (I guess) the one which varies, to deliver more or less heat / cool, as needed.

The new Daikin (in bedroom) appears to stop indoor unit completely (but flaps remain open) when set point is reached. When it needs to heat again, it will start the indoor fan. Problem is that this in my opinion makes the unit un-useable in a bedroom at night, as the start/stop is disturbing, as opposed to a continuous noise which you can go to sleep with.

Even when set on a certain speed (out of the 5 levels available), it stops when reaches the set point. I agree with this behavior if speed is "auto" but not when in a "manual" mode. Is this how the system is supposed to work?

Even on "night quiet" (moon+tree symbol on remote), the fan starts/stops as described above. It is generally quieter when it runs (I could definitely sleep with that) even if there is not much air coming out of it, but once in a while it starts on higher speed, even if for 5 seconds, then stops. Enough to keep you awake!! Or it starts on this quiet mode and there is warm air generated, all good, runs for let's say 1-2min and then speeds up for 5 sec (noisy) and shuts down the fan (flaps remain open, green light is on).

There are no error codes confirmed by the remote controller.
The intelligent feature is turned off, no Econo, no Comfort are activated, just basic heating mode.

Please do not send me to "take it with the installer" as I could not get advice from him."I just install them mate, I did not design it" kind of reply...Your opinion will be much appreciated and will not involve you in any way, you have no responsibility for the advice you give. I just want a thought from someone knowing these systems. 


Many thanks in advance




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  Reply # 862809 20-Jul-2013 22:53
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That's how our one works, just as you describe. Not a problem where I live, as set at 20 degrees it can run day and night and never stop as it never gets to 20 inside :(

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  Reply # 862913 21-Jul-2013 09:40
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I've got a Panasonic, and the fan behaviour depends on the heating/cooling mode selected.

When set to cool, the fan will run continuously at the set speed, with the compressor doing it's thing to maintain the set temperature. If the fan speed is set to auto, then the fan speed will also vary, including turning off totally.

Set to heat, and the fan behaviour changes. The fan will cycle on and off up to the fan speed you have selected.

Reading the manual (what was I thinking??) the explanation for this behaviour was that in heating mode, the fan only runs when the compressor is running, in order to reduce draughts blowing air around that is not being heated at that time. On the cooling cycle, a draught can be a good side effect, so the fan runs continuously.

Even on the settings when the fan stops completely, it kicks in for a couple of seconds every 5 mins or so, presumably to take an ambient temperature measurement.

EDIT: Turn on ECO mode, and the fan seems to run for a greater length of time, presumably with reduced output from the compressor. Depending on the temperature difference, it may as well be running continuously sometimes, so this may be worth turning on for you?

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  Reply # 862927 21-Jul-2013 10:19
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IlDuce: That's how our one works, just as you describe. Not a problem where I live, as set at 20 degrees it can run day and night and never stop as it never gets to 20 inside :(


OT: If this is the case you're heat pump is under sized for the area you're trying to heat. Try shut some doors to limit the area it needs to heat. then open them once it has reached temp.
If it was professional quoted and installed call them back to tell them.




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