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Ductless heat pump systems

I am looking at puting a ductless heat pump system im my home and i dont know how relilable these systems. i was told that they dont work very will in temperatures around zero degrees. im currently looking at a Mr. Slim or Sanyo system.

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Re: Ductless heat pump systems

Fixr is correct. I do not recommend using the Mitsubishi or Sanyo below 17 degrees. It may cost you a fortune in electricity below 50 degrees depending upon where you live. Mitsubishi is the better model.

Posted on Nov 19, 2007

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Re: Ductless heat pump systems

Heat pumps do loose their heating capacity and efficiency as temps drop. If you decide to rely on a heat pump you may want to make sure that your system has a back up heat strip, maybe even controled with an outdoor thermostat, if that is an option. The Mitsubishi is a great product.

Posted on Nov 17, 2007

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I have a Mitsubishi heat pump that runs well but the outdoor unit does not defrost what could be the problem.

Why does my heat pump ice up in Winter?
Heat pumps naturally ice-up in the winter. It is normal for the entire coil to be covered in a white frost and even light ice, during cold weather conditions. However, it is bad for the entire unit to be encased in ice. This indicates ductless heat pump problems which should be addressed quickly to save energy and avoid serious damage to your ductless unit. These systems should periodically go into a defrost cycle. This keeps the unit running efficiently. If the coils are blocked by ice, proper heat transfer between the coil and the outside air will not occur.
How does the defrost mode work?
When the mini split heat pump goes into defrost, the reversing valve inside of the outdoor unit is energized, switching the system from heat to the air conditioning mode. The outdoor coil becomes the hot, the indoor coil becomes cold, and both - the outdoor and indoor fans shut off. This allows the outdoor coil to melt accumulated ice. When the built-in micro-computer analyzes that all ice have been melted, the heat pump heating system goes back to heating mode.
sanyo-mini-split-defrost.pngA cloud of water vapor may be seen rising over the outdoor unit and a "whoosh" sound can be heard as the refrigerant reverses direction. The entire process usually takes up to 10 minutes (depending on conditions).
How often does the system goes into defrost mode?
Ductless mini-split heat pumps have different ways of determining when to go into defrost. The built-in microcomputer determines outdoor temperature, refrigerant pressures, and several other factors. In colder temperatures the system will go into defrost more often than in warmer.
If a ductless mini split heat pump is severely iced-up in the winter it is possible that it isn't defrosting (though there could be many other causes). Let the manufacturer certified technician check your system

Oct 29, 2011 | Mitsubishi Mr. Slim MXZ30TN Air...


Ductless Heating and Cooling of the Hard to Duct Home

You are <b>building a log home</b> or a home that you want the rustic look of the <b>floors above also being the ceiling of the floor below</b>. You hate the thought of having to install ugly <b>heating and air conditioning ductwork</b> in your new home. For you there is hope. You can still have a comfortable home and have the look that you want.<br /> <br /> The advancements in <b>ductless heating and cooling</b> has made it possible for you to have those wood ceilings, roof lines, wood walls, and everything you can think of. The new <b>ductless HVAC units</b> take up very little space on your wall. They can be placed almost anywhere with a little planning, and they are<b> very efficient at both heating and cooling</b>.<br /> <br /> The many features do not stop with the<b> heating and cooling</b>. Most units have remote controls to run the unit. Many of these units can run <b>multiple inside units from one outdoor unit</b>. These units are so quiet that you have to feel the air coming from them to see if they are running. The installation has been simplified to the point that they can be installed very quickly by an <b>experienced professional</b>.<br /> <br /> If you are concerned about the looks on the outside, that too can be fixed rather easily. The <b>piping and wiring going to the indoor units</b> is relatively small and can be hidden in many ways by using a little imagination. Colored aluminum can be fabricated to cover the pipes. I have also run the piping through rain spouting and made it to look like just another rain spout coming off of the roof. <br /> <br /> If you are looking to build or remodel and are worried about the look you will have on the inside, then take a look at <b>ductless split heat pumps</b> to give the comfort and the looks.<br /> <br /> Good<b> heating professionals</b> can find many ways to make these units work for you. Make sure that you do not settle for something less than you want. You may need to look at more than a few companies to find the one that will give you the system that you want.

on Feb 19, 2011 | Air Conditioners


Ductless Split Air Conditioner Review

Ductless split air conditioning units are the very best thing for some situations. Of course they can be installed in the place of most any central air conditioning unit. They also are a very good alternative to window air conditioning units. I will explore the use of these units more closely and look at how they can be used effectively.
One of the many problems encountered by the professional is when they are asked to install central air conditioning in an older home that was never designed with air conditioning as even a possibility. The walls may be very thick stone. Often they have very little or no insulation. The floor structures may be rough cut lumber. The joists spacing may be random. Walls and ceilings are plaster and lathe. Basically everything is stacked against any type of ducted central air conditioning. Many log style homes also are not very easy to get any kind of ducted central air conditioning installed. The open ceilings and the bare log wall design does not allow for any kind of ducting. I'm sure there are other situations. These are the ones that I have come across most frequently.
If you have a home or building that falls into one of these categories you may want to investigate installing a ductless air conditioner. This type of air conditioner can be installed in almost any home or building. The small indoor unit can be attached to the wall with a few screws. Most of the units only require that a three inch hole be bored through the outside wall. In new installations the units can be placed on inside walls with some fore thought and planning. For installation in older homes or homes that are already built you will want to plan the units to be on the outside walls.
The outdoor condenser units can be placed up to one hundred feet away from the indoor units. One outdoor unit can be used for many indoor units. Up to four indoor units can be attached to the same outdoor condenser. Some very advanced electronics will control the operation of the condenser and compressor to supply the refrigerant to the indoor air handler units that are running at the time. With variable speed technology the compressor and the condenser fan will only run as fast as needed. This technology has become very efficient in the last few years. You do not have to give up any efficiency with these ductless split units.
Another advantage to these mini split air conditioners is that they can be controlled to run only in the rooms that you actually need air conditioning in. If you are not going to be in a room you can shut down the unit. The units also have timers that can be set to turn the air conditioning on or off at preset times. If you are not going to be home all day the air conditioning can be setback or turned off. The timer will turn on the air conditioning so that you return to a cool house. Central air conditioning is very hard to zone effectively. Also with large central air conditioning systems the outdoor compressor will be running at full capacity even though only a few rooms amy be calling for cooling. There are some central air conditioning systems that are do some staging and variable speed technology. These are not as efficient or as effective as the ductless split technology.
Ductless split heatpumps are another great idea to look at. For a few dollars more you can also very easily have heat from your air conditioning mini split. Then especially in the mild spring and fall weather you can have some very efficient heat with out starting up that big monster of a furnace or boiler in the basement. In southern climates the heatpump version of the ductless split system may provide enough heat year around.
Ductless split air conditioning is definitely something that can solve many problems for some homeowners. Add to that the many advantages of these units and you will find that they are worth every penny that you will invest into them. As with any project like this make sure that you screen your contractor. These units are not for do it yourself people. There are many things that need to be done correctly for these units to work properly and efficiently. A refrigeration license is also required to install these air conditioners.
By doing a little research and hiring the right person you will enjoy many years of trouble free service from your new ductless mini split system.

on Dec 04, 2009 | Air Conditioners

1 Answer

Why won't my lg ductless heat pump regulate the room temperature?

After I have been reading up on your unit it appears that the thermostat is not operating correctly. I found this real basic information on installation for your unit. This link I am giving is pretty basic instal schematics. But seems to be something about your thermostat needs to be dialed in or is not working properly.

I hope this helps some. Mike

Oct 21, 2011 | GE Quiet-Aire Ductless Mini Split System...

2 Answers

LG Ductless Mini Split System LAN125hv: Heat pump doesn't run.

First check your circuit breaker or fuse that supplies power to the outside unit. It's probably separate from the inside unit. Then try to turn unit on. If the fan and compressor just make a humming sound then turn it off and check the capacitor if you have a multimeter. You can also look at it and see if the top looks expanded. That's a good sign its bad, but not all bad one's look expanded. Tomorrow I will have access to an LG service manual and can let you know what the code means. Sorry I can't get it sooner. Let me know what you find.

May 02, 2010 | LG LA185HV Split System Air Conditioner

1 Answer

Where can I get a remote for a Model ASORD18DA Ductless and a service manual.

Hi; Look in the Yellow Pages for Your local ac supply house they can order it for You or point You to the manufacture for assistense...alpharome416

Feb 18, 2010 | GE Quiet-Aire Ductless Heat Pump Split...

1 Answer

Ductless heat pump - how many and where located in home

i live in sandwich and am mitsubishi expert
please call
yellowdog services

to much to type here

Sep 26, 2009 | GE Quiet-Aire Ductless Heat Pump Split...

1 Answer

Ductless minisplit in old mobile home

ductless mini split units are a very good choice!  they are obviously quieter, more efficient and easier to maintain than window units. the downside is the initial expense of buying the unit, but this is paid back in eletric savings and peace of mind. Good luck Peyton

Mar 07, 2009 | Soleus KFR12GWD 12,000 BTU Heat & Cool...

1 Answer

My GE ductless system is not heating properly and trips breaker

Call them yourself. Let them know your compressor is tripping your breakers. Also, ask how to obtain parts for your system. It's rediculous an hvac tech cannot get advise from ge.

Dec 05, 2008 | GE Quiet-Aire Ductless Split System Air...

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