Question about Mitsubishi MXZ-2B20NA-1 Mr. Slim Dual Zone Wall Heat Pump 18 Seer

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I am not able to get the unit to change from air conditioning to heat

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tractorman44

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When an 'inverter' system switches modes, essentially what happens is nothing more than a solonoid coil in the 4-way reversing valve energizes changing the direction of refrigerant flow. Its almost a non-discernable sound due to the small size and small quantity of refrigerant typically in small capacity ductless splits.

Due to the low discharge air temperature of a heat pump as compared to a fossil fueled heating supply, it is sometimes difficult to decide what mode they are in by feeling the air temperature. Fossil fueled heat sources are based on a 70 degree temperature rise meaning, if your house is 70 degrees, it will put out approximately 140 degrees. Conversely, a heat pump discharge air temperature is typically in the 85 degree range.

To determine for sure, take an accurate probe type thermometer and place it in front of the discharge air grill and observe the temperature in the cooling mode for 5 minutes. Then switch the system to the heat mode and observe the temperature for 5 minutes. You should then be able to easily determine if in fact it is or is not going into the heat mode.

Trouble shooting is done through a series of codes you enter by pushing a sequence of buttons on your remote. When the correct codes are applied, the digital display will give you error codes that then can be utilized to repair the unit. Mitsubishi essentially 'wrote the proverbial book ' on ductless mini-splits and are the Cadillac of the ductless split world.

Posted on Dec 28, 2014

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Unfortunately these units are not user fixable , beyond checking for power and checking battery in remote. You would need to call a pro who is able to get service information and has special digital logic meters to diagnose and repair .

Posted on Oct 05, 2014

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1 Answer

Why does the external unit go between extracting hot and cold air without any setting changes?.


if you have your air conditioning on an "automatic mode"
You set the temperature and the unit will decide what it has to do to achieve this temperature, ie heat or cool, the unit will the switch back and forth to try and maintain rhe set point temperature, this is totally normal,

Feb 01, 2016 | Heating & Cooling

Tip

KNOWING ABOUT CONDENSER


What is a condenser?
Is a device or unit used to condense vapor into liquid. A condenser is simply one component of an air conditioner. Whether you have an outdoor air conditioner or a window unit air conditioner your air conditioner contains a condenser.
Condensers are used in outdoor air conditioning systems as well as heat pump systems. Condensers in an air conditioning unit have very few controls. They will have an on and off switch. Occasionally these air conditioners will also have a brown out option. This option shuts down the compressor when the electrical current is low.
A condenser is simply a heat exchanger. It compresses refrigerants into a hot gas to then condense them into a liquid. A condenser is a major component in a air conditioning or heat pump unit. It moves air across the coils to facilitate the transfer of heat.
In a heat pump unit the condenser has a few more features. It will have a reverse valve that allows the unit to switch back and forth between air conditioning and heating. Even when the unit is heating, it uses the condenser for defrosting the coils. If the coils become layered with frost it will effect the units effectiveness this is defrosted when the reverse valve switches to air conditioning mode to move the hot gases through the coils melting the built up ice. It will automatically switch back to heating mode once the ice is cleared to once again heat the home.
To keep your unit in good operating condition it is vital to keep the area around the condenser clear of all debris as well as keeping the filter clear of dust and dirt. A clean machine makes a happy machine. A happy machine will keep you cool during the summer months and warm during the cold months. It is suggested to change the units filters when they become dirty, depending on your area and conditions near your home this may be as often as once a month or as seldom as every 3 to 6 months. You will have to pay close attention to your units needs to decide the right time to change or clean your unit’s filters.
It is very important no matter what type of unit you have to prevent the blockage of the condenser. If the condenser becomes block it can effect the units efficiency or even cause the until to completely fail. For this reason it is one of the most important components of a cooling or heating system. A condenser allows the maximum airflow to the unit.
Keeping you condenser in good running condition will not only prolong the life of your heat or cooling system but also provide you with the most efficient heat and cooling system saving you money on heat and cooling.www.victorwod1234.blogspot.com

on Apr 08, 2010 | Heating & Cooling

Tip

How Heat Pumps Work


How on earth can you get hot air or hot water from very cold outside air? How does a heat pump make this heat out of cold air?
When certain gases change their state from a liquid to a gas or from a gas to a liquid the magic happens.

A heat pump can do some pretty amazing things, when it comes to making heat. To understand the way they work, you must first understand what happens when certain gases change from a liquid state to a gas and back to a liquid again. To simplify it a bit we need to look at a basic air conditioning system. The refrigerant in an air conditioning system is changing to a liquid in the outdoor condenser. The compressor compresses the gas forming a hot gas. As this gas cools under high pressure it changes into a liquid form.

Inside the indoor coil the liquid is pushed through a small hole or orifice. When it comes out the other side it rapidly changes it’s state to a gas as the pressure suddenly drops. The rapid pressure drop changes the refrigerant to a very cold gas. Air flowing over the cold gas inside the pipes makes the air cool and provides air conditioning.


Now for a heat pump the process is much the same, only coils are just switched by used a reversing valve in the outdoor condenser unit. Instead of the heat being purged to the outside from the condenser unit, the indoor unit then becomes the condenser coil. The outdoor coil becomes the cold coil and cools the outside. This is why if it is very cold outside the unit will have to run in air conditioning mode for a short time to defrost the outside cold coil. When this happens the system will usually have electric heat inside to run and keep the indoor air warm.

The reality is that a heat pump is really no more than an air conditioner running in reverse. Through the magic of using refrigerants, a heat pump can then run many times more efficiently than straight electric heat. A careful heat loss/gain should always be performed by a qualified service person before any sizing of a unit. Too large or too small of a heat pump system can make it inefficient and possibly cause it to be very uncomfortable. The longevity of the unit can also be affected by sizing and installation. Be patient and look carefully for the best contractor to install your system.

A properly designed and installed heat pump system can give you many years of comfort and efficiency. If you look for and find the contractor that can do the job right you will get many trouble free comfortable years from your heat pump unit.

on Dec 29, 2009 | Heating & Cooling

1 Answer

Why does the air conditioning unit stop blowing after second setting on 1996 Dodge Dakota Sport truck?


Blower switch is bad, or the blower's speed control resistor is bad, or you have a poor connection in a connector between the switch and the blower.

Jul 29, 2014 | Air Conditioning and Heat for Dodge Ram...

1 Answer

Is there any filters to change for air conditioning


Yes, there should always be filters in your heating and air conditioning system. Assuming you are asking about a central heat and air system for a home or business, the filters will be located in the return section, basically where ever the air flow is getting sucked back into the system. More updated systems will have the filter in a filter grill inside the home or business, while older systems can have them inside the unit itself, usually above the unit inside. Hope this helps with what you were asking for, if you needed info on another type of system, feel free to ask. Good luck!

Jul 03, 2011 | Heating & Cooling

1 Answer

My air conditioning blows hot air only, nothing


ok if unit is split system two piece check to see if out door unit is running fan and compressor the air coming out of the fan should be about 20 deg warmer than out door temp if not compressor not running check the capicitor to see if swelled up on top if so bad if unit has electric heat strip a heat relay may be stuck and you are running aug heat to check this pull disconect on out door unit and see if heat is out of vents if heat pump reversing valve may be bad hope this helps

Jul 04, 2009 | Heating & Cooling

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