That's what is use to measure how fast an inverter's difference in acquisition cost is recouped vs a non inverter. Actually already saved when using as it's consumption is halved or 60% less so long as it's spec correctly. Typically, priority is bedroom. Living hall where time is mostly spent in the home can be expensive to justify even when size correctly as the cooling load is higher...the room typically consists of living and dining area with leakages to upstairs and the kitchen for double storey home.

This post has been edited by halcyon27: Mar 27 2018, 10:12 PM

R410 is 50% R32 and 50% flame retardant of at least 2 ingredients total of 3 gaseous compound. That's why it should be pricier.

This post has been edited by halcyon27: Mar 28 2018, 10:46 PM

Just learnt a new maintenance tip from neighbour's go to maintenance guy who services lots of condo. Wash outdoor compressor cooling coil once or twice yearly depending upon how heavy the traffic flow.....tyre and brake dust can accumulate on the cooling fins and affect the heat dissipation from the compressor.

Dealt with ceiling mounted cassette before here. Ceiling height and beam clearance are main factors that determine if it's suitable or otherwise.

The service manual will tell. Not the used manual unless it's that detailed. Otherwise, inspect if there is a part number inscribed on it and Google it.

This post has been edited by halcyon27: Jun 22 2018, 08:38 PM

Sharp inverters and non inverters has this since 2008-2009. They call it Gentle Cool here but most other countries, Coanda cool by the discoverer of this aerodynamic phenomenon called the Coanda effect.

Hitachi implemented it in their premium inverters with sleep camera (dark grey casing color) as Air Sleep Ceiling.

Daikin inverters FTKC25/35 and FTKV50/60 implement it as Comfort Airflow Mode.

Perhaps also the premium Daikin Ururu Sarara possibly as well as the Mitsubishi Electric MS-Z series premium inverter.

If an non equipped AC model is placed high enough say 9ft from its base to the floor and the flap is set to the highest position, it will not hit a sitting or prone occupant unless the room is very long from where it is blowing.

Certain Mitsubishi models esp the StarMec non inverters have what's called long throw which basically does the same thing...throwing the air to the other end of the room.

For those models not equipped, don't despair or rush to change your AC as Homefix sells this strip that will deflect air towards the ceiling from Japan.

This post has been edited by halcyon27: Jun 25 2018, 11:43 AM

This was asked way back last year. It's called Air Wing, made by Daian Japan. See the post here. It's sold in Homefix.

This post has been edited by halcyon27: Jun 25 2018, 03:29 PM

They are ok but new owners can be unnerved by it's loudness even at low fan (30dB). The only way to silent is to use the sleep button (hand with index finger over lips icon). That will reduce the noise level to 19dB. If the compressor is placed outside your window, it can be slightly loud. If they are placed a little further, you won't hear it as much.

Inverter models with premium R410a adding stainless steel to many parts where plastic would start to mould. One up that is the 2015/2016 R410a inverter with sleep camera and Air Sleep feature which blows air ceilingwards....good for baby, kids or elderly.

This year's Hitachi debut R32 gas inverter model adds to these Frost clean...using frost and then heating the heat exchanger (cooling coil) to clean itself before drying...to prevent mould.

You may also want to consider Electrolux inverter (Viva Grande)..they are quite saving at 1352kWh/year. The plus point is they add left right in addition to the usual up down auto scrolling and 7 Fan speed levels. Not many 1hp/1.5hp are equipped with auto left right scrolling.

This post has been edited by halcyon27: Jul 3 2018, 12:28 PM

Cassette needs 11ft ceiling height. Minimum is 10.5ft. It needs to account for the depth plus the pipes must clear the beams. Place the AC above the window or sliding door. Else along one of the walls, above sofa to allow unobstructed use of the TV wall.

This post has been edited by halcyon27: Jul 13 2018, 08:33 PM

Before considering ceiling just a tip that the net ceiling should not be below 9.5ft otherwise it will be very uncomfortable as the heat stratification is just above head level and it's easily perceived as stuffy.

The Carrier using R22 gas. What models are these? Spartan?

AC so long as regularly serviced where indoor and outdoor units are properly maintained should provide years of service.

As R22 are phased out since 2009, your best bet is R32 gas units. R410 is otw out as well. Panasonic, Daikin, Sharp, Mitsubishi and Hitachi would have produced these units.

One thing to note coming from R22 is the pipes. R22 uses mineral oil for their compressor lubricant whereas R410 and R32 are ester based synthetic.

The safest option is to replace the old AC piping with new ones due to the incompatibility of the compressor lubricant. Unless the old pipes are thoroughly purged and vacuum to remove any mineral oil residue, the newer compressors won't stand a chance in the long haul.

Inaba Denko Paircoil pre-insulated pipes are the ones to go for. If have to reuse due to embedding, ensure the pipes are purged and they must be at least 0.61mm thick owing to R410/R32 operating at 1.6/1.7 times greater pressure then R22. Safest pipe thickness is 0.8mm.

I've seen Carrier inverters sold in One Living but don't know much about them.

This post has been edited by halcyon27: Jul 16 2018, 03:14 PM

Get the R32 Aerowings from Best Denki. Cheaper. Scout around as Panasonic publishes MSRP. The dealers and appliance shop could be cheaper.

How tall is the beam? Compare the beam height to the height of the ceiling unit and see which is taller measurement. Add 1"offset clerance from the ceiling to the top of the unit and about 4-6" to accommodate the drop clearance for the piping, how much is left?

See this discussion here.

Living room blue, Master bedroom red. Use models that features long air throw like a Panasonic Aerowings or Sharp. This way, you can leverage selective spot cooling where required.

Master should go for 1.75HP as it may experience more heat load from the roof and ground floor at least 2.5-3HP since it covers living dining and kitchen. If you want it for living area, zone it with a closeable partition.


This post has been edited by halcyon27: Jul 27 2018, 01:57 PM

Yes, they draw when off. Minimal. Used to be a lot more esp those with heating function.

The calculation was 13800BTU/hr no? Stretching it to the limit for a1.5HP. Go for a1.75HP

This post has been edited by halcyon27: Aug 12 2018, 12:33 AM

If the pattern is such that the bedroom is always warmer then the living room even when there's were no AC before in both areas yet, revisit the parameters....are there more windows or the bedroom have less shading vs the living; living room downstairs vs the bedroom upstairs ie bedroom under an uninsulated roof perhaps etc.. Something which might show that perhaps the bedroom needs a higher load calculation.

But yes, also get an installer to check if there's a leaky connection.

My condo unit kitchen combines all and we have a 1hp. At times when cooking is heavy esp for parties, my wife turns it on. It's barely adequate given the heat coming off the cooker and oven. Our hood recirculates rather than vented. Seems that 1.5 or even better 2hp is much suited for cooling.

US air conditioning manufacturer Carrier has developed a prototype high speed screw compressor and tested it with a new low pressure, non flammable HFO refrigerant as a potential long term solution for air conditioning systems.

Source: coolingpost.com