Air Conditioner Standby using 300W

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Re: Air Conditioner Standby using 300W

Postby Gordon-Loomberah » Sun Jun 23, 2013 7:28 pm

It sounds like poor design, but maybe they are models marketed internationally - the same model for everyone, and they have to cope with winter north of the Arctic circle in Norway etc
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Re: Air Conditioner Standby using 300W

Postby jsull » Sun Jun 23, 2013 9:28 pm

The 300W is definitely just the air conditoner and it is 24/7. We have the EMPower monitor so could see that our base load was extremely high so we turned things off one at a time. We have been leaving it switched off at the power until we get this resolved. The unit isn't using our hot water service. I can understand that the sump heaters use power but I thought it would be more like 40W. I'd like to find out what Mitsubishi's figures are as they said we'd be charged for a service call if they don't find a fault. I like the idea of the switch to control the sump heater though.
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Re: Air Conditioner Standby using 300W

Postby FarmerJohn » Sun Jun 23, 2013 9:48 pm

Smurf1976 wrote:I can't avoid noticing that many such systems have no such heater at all which raises questions about the overall design of those that supposedly need them.


My ducted A/C system does this. I always wondered why it always used a lot of power even when I had switched it off at the A/C control board - I suspect it is doing what yours is. I keep it turned off at the DB to avoid the 65W load 24 x 7 - it is vary rarely used so this is acceptable to me, but I wish it didn't do that. Still it was part of the house when I bought it.

If I turn it on, the system wont start for about 10-20 minutes or so, depending on the weather - this seems consistent with the explanations above.

I think it is poor design - there should be an energy saver option on the control board.

Maybe they think that A/C users don't care about energy costs :) Given the specs on mine I would not be surprised. My system is 6kw, and has a 5kw boost heating element (this is independently wired at the DB and is never switched on!) so it does have the capacity so use vast amounts of power... I will stick to the wood-burner.
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Re: Air Conditioner Standby using 300W

Postby davidg » Sun Jun 23, 2013 11:31 pm

FarmerJohn wrote:My system is 6kw

Lucky ours is "Dandenong house" = 14kw

New house at the farm none going in. We should not need it, thanks to water chilling of the slab for hot weather and hot water for cold weather.
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Re: Air Conditioner Standby using 300W

Postby Privatteer » Mon Jun 24, 2013 2:37 am

FarmerJohn wrote:I think it is poor design - there should be an energy saver option on the control board.


As I mentioned before some have a jumper to remove. I suspect many installers don't bother reading the full installer instructions.... I won't say its there for every brand/model however.
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Re: Air Conditioner Standby using 300W

Postby Tracker » Mon Jun 24, 2013 9:58 am

Plus one to the sump heaters..

The big consideration is where these machines are designed to work.. ie places like the USA where they have meters of snow ..

I would first take off the compressor cover and see if there is a band around the base of the compressor.

I would definitely disconnect it in summer and would wonder if it was ever needed in more northern climates wet Hobart.
A simple thermostat could force it on if the temp goes below say, 5c..
A simple thermostat could stop the compressor from running until the activated heater does it's job.. it might mean an hour's delay.??????

The appropriate question... why don't all compressors have them..?
One possible reason is the considerable height of some, and hence the issue of getting oil up there when thick..
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Re: Air Conditioner Standby using 300W

Postby offgridQLD » Mon Jun 24, 2013 10:34 am

I wound be thinking the large units (big motors) have the heaters to limit the spike loads as the big motor attempts to start the pump in a high viscosity condition. Perhaps the small units get away with it as the motors spike loads aren't high enough to create issues .

My understanding was RC AC units were infective at sub zero temps.?

300w sounds wrong. Think of a towel rail heater they are usually 50 - 70w and can get your wet towel dry and toasty warm in 1hr or so. So 300w heating directly to the sump just to lower the viscosity of the oil sounds excessive. Are you sure there is a faulty contractor something that's chewing a ton of power in addition to the heater element? I would like to see the listed spec for the heater element or if you could just isolate the element for testing propose.

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Re: Air Conditioner Standby using 300W

Postby Tracker » Mon Jun 24, 2013 2:21 pm

offgridQLD wrote:300w sounds wrong.

Plus 1.. Kurt
But there could be a thermostatic control and you can see the HIGH..
Clutching at straws, I know, but surely the 300W is a correct measured figure, and what else could draw that when in standby.. unless there is something else connected to the circuit that is not obvious..

I would be removing the case and just looking..

The specs for the RAC - SHOULD show the standby current... What does it show..
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Re: Air Conditioner Standby using 300W

Postby munrre » Tue Jun 25, 2013 3:00 pm

Gordon-Loomberah wrote:Much more sensible would be to have the heater on for an hour or so before you want to heat or cool with it. Sure it takes a bit of planning, but is more environmentally sound, and easier on the wallet.


This is what I do.
It is off at the switchboard until we need it, which is thankfully only about 20 days per year.
I'm not even sure if ours has a sump but the 60w on standby 24/7 is unacceptable.
I tell everyone who will listen about this hidden energy hog.
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Re: Air Conditioner Standby using 300W

Postby pete666 » Wed Jun 26, 2013 8:29 am

Hi
Mitsubishi provided this reply when i inquired about split system standby power.

175 watts in standby that hurts


Hello Peter,

I have had the factory reply to the question of standby power for the PUHZ-BP250YHA. They have confirmed that the average standby power for that model is 175 watts.

I hope this helps, please feel free to contact us if we can be of further assistance.

Best Regards,
John Taylor


Service
Mitsubishi Electric Australia Pty Ltd
348 Victoria Road
Rydalmere, NSW 2116, Australia

T: 1300 651 808 F: 61 (02) 9684 7684

www.MitsubishiElectric.com.au
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