Daikin highwall heat pump overheating room - how to make it stop heating at setpoint

Forums › Home Workshop DIY › Daikin highwall heat pump overheating room - how to make it stop heating at setpoint

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tweake

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#3020150 11-Jan-2023 15:09

timmmay:

Jase2985:

is the fan on auto too?

i would have thought if it was on a fixed speed then the fan would keep going, the unit would just ramp down its heating/cooling output till it turned off at the set temp. The fan would keep running.

In auto (Fan speed) the fan would slow down to its slowest speed. as it still needs to be bringing air into the unit to be monitoring the temp.

The fan behavior changes depending on mode:

Cool: fan runs all the time
Heat: fan runs until up to heat, then it occasionally spins up on a very low speed to check the temperature in the room
Auto: fan seems to only run when required, including on cool
I tend to use a fixed fan speed in both modes, as the unit on auto selects a very low fan speed. I want the fan speed higher to push the air out through the room, and to mix the air up a bit so the heat gets down to the floor level.

my Panasonics are similar, however there is no manual air speed in heat mode. doesn't matter what fan speed you select its auto fan only. they may have done that because air movement feels cool, which is not what you want while heating.

timmmay

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#3020166 11-Jan-2023 15:51

tweake:

my Panasonics are similar, however there is no manual air speed in heat mode. doesn't matter what fan speed you select its auto fan only. they may have done that because air movement feels cool, which is not what you want while heating.

Or maybe because Panasonic are rubbish ;) I'll never buy another Panasonic after the ducted system I had removed, and the Panasonic microwave I have isn't great either.

High fan speeds are helpful for fast heating or reaching the far end of the room. It might feel a bit cooler, but mine seem fine on any speed.

tweake

2391 posts

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#3020167 11-Jan-2023 15:58

timmmay:

tweake:

my Panasonics are similar, however there is no manual air speed in heat mode. doesn't matter what fan speed you select its auto fan only. they may have done that because air movement feels cool, which is not what you want while heating.

Or maybe because Panasonic are rubbish ;) I'll never buy another Panasonic after the ducted system I had removed, and the Panasonic microwave I have isn't great either.

High fan speeds are helpful for fast heating or reaching the far end of the room. It might feel a bit cooler, but mine seem fine on any speed.

they still run fast on auto, but cut back when required and stop. tho i must admit it would be nice to have the option.

allio

885 posts

Ultimate Geek

#3021587 15-Jan-2023 13:38

Just something else that I haven't seen being mentioned - I'm struggling with the same thing with my new Daikin high-wall and I've noticed that it behaves quite differently when controlled with the remote as compared to the wifi. Specifically, when the temperature's been set by wifi the overshoot behaviour is far worse - it'll cool 3-4 degrees past its setpoint and still be blasting. Making adjustments to the target temperature on the app results in no change. But, if I adjust the target temperature (in either direction!) on the remote, it will immedately come to its senses and stop. When used with the remote only, it still overshoots on cool mode but not as badly, and actually works pretty well in auto.

It just generally seems to be a lot dumber when controlled over wifi than by the remote. As above auto mode works well with the remote. Over wifi it usually ends up on the wrong mode entirely, blasting hot air into a hot room. It's just so strange.

timmmay

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#3021717 15-Jan-2023 20:12

allio:

Just something else that I haven't seen being mentioned - I'm struggling with the same thing with my new Daikin high-wall and I've noticed that it behaves quite differently when controlled with the remote as compared to the wifi. Specifically, when the temperature's been set by wifi the overshoot behaviour is far worse - it'll cool 3-4 degrees past its setpoint and still be blasting. Making adjustments to the target temperature on the app results in no change. But, if I adjust the target temperature (in either direction!) on the remote, it will immedately come to its senses and stop. When used with the remote only, it still overshoots on cool mode but not as badly, and actually works pretty well in auto.

It just generally seems to be a lot dumber when controlled over wifi than by the remote. As above auto mode works well with the remote. Over wifi it usually ends up on the wrong mode entirely, blasting hot air into a hot room. It's just so strange.

Interesting. I mostly have Home Assistant control the heat pump using WiFi. I'll try with the remote to see if it behaves any differently.

When I get around to it I'll write some kind of Home Assistant automation or AppDaemon app to let the temperature sensor on my desk act as a remote thermostat. It shouldn't be particularly difficult.

allio

885 posts

Ultimate Geek

#3022046 16-Jan-2023 14:17

timmmay:

Interesting. I mostly have Home Assistant control the heat pump using WiFi. I'll try with the remote to see if it behaves any differently.

When I get around to it I'll write some kind of Home Assistant automation or AppDaemon app to let the temperature sensor on my desk act as a remote thermostat. It shouldn't be particularly difficult.

This is going to be my solution too. Whoever gets around to it first - post your HA code in here!

timmmay

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#3022067 16-Jan-2023 15:02

I'm writing code in AppDaemon, but I probably won't finish for a few days and would want to test it for couple of weeks before posting. There is a standard home assistant component and a few threads on the home assistant forum with half solutions, But won't quite do what I want.

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