Air Conditioner Circuit Board Troubleshooting 5/5 (1)

Air Conditioner Circuit Board Troubleshooting Air Conditioner Circuit Board Troubleshooting Question – Hello, my name is Calvin and I am an HVAC Technician that graduated from a community college 2 years ago and I am still learning and know I have much more to learn before I think of myself as an expert. I have … Read more…

How Much Refrigerant for the Air Conditioner 5/5 (1)

How Much Refrigerant for the Air Conditioner How Much Refrigerant for the Air Conditioner Question: What amount of Freon would it take to service a unit that services a 1200 square foot residential house if it were completely depleted? How Much Refrigerant for the Air Conditioner Answer: We get questions like this a lot in our … Read more…

Helping Your Air Conditioner – Beating the Heat 5/5 (1)

Helping Your Air Conditioner – Beating the Heat What do do when your air conditioner doesn’t cool your house properly? Take this short quiz to see if you know what to do when your air conditioner does not cool your house and runs all the time. You can answer the question, Helping Your Air Conditioner, easier … Read more…

How to Fix Sweating Pipes 5/5 (1)

How to Fix Sweating Pipes

What you will learn from this article:
1) one of our readers submitted the question, How to Fix Sweating Pipes – and we will answer her question.
2) a description of the problem with the sweating pipe
3) the name of the copper pipe causing the problem and why it is sweating
4) the repair of the sweating copper pipe to stop it from sweating
5) what you need to know about sweating pipes and any moisture problem in your house
6) lots of resource and related links to help you learn

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Supply Vent Myth – Does Closing Supply Vents Save? 5/5 (1)

Supply Vent Myth – Does Closing Supply Vents Save?

What you will learn with this post:
1) How modern duct systems are designed
2) How closing the supply vents effects the static pressure in the duct work
3) How closing supply vents effects modern HVAC equipment
4) How to save energy and therefore money
5) Where to obtain the books and/or software to learn how professionals design duct systems and do load calculations for sizing heating and cooling systems
6) How heating and cooling equipment ie furnace, air conditioner, or heat pump can be effected by closing off supply vents
7) Alternative methods used in commercial HVAC
8) Alternatives for residential HVAC

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Air Conditioner Causes Water Damage 5/5 (1)

Air Conditioner Causes Water Damage

Air Conditioner Causes Water DamageAir Conditioner Causes Water Damage Question – Hello, We need to ask you about water damage and how an air conditioner can cause this kind of damage. The whole ceiling in one of rental properties just fell into the living room. All the drywall and insulation from the attic fell and caused damage to our tenants furniture. Thank God the tenants were not at home and injured when the ceiling fell in. The insurance adjuster came out and looked at it and said the problem was because the filter was clogged and air conditioner froze up inside the air handler. When the air conditioner turned off the ice melted and overflowed the pan. It continued to slowly overflow the pan for a few hours until the ice completely melted. The water logged the drywall in the ceiling until it eventually fell in and caused the damage it caused. The insurance adjuster seemed to be very knowledgeable about things like this and I was wondering if a dirty filter could cause such a problem and make the air conditioner ice up? We look forward to your answer. Thanks, Val

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Replace HVAC Compressor for Air Conditioner Repair 5/5 (1)

Replace HVAC Compressor for Air Conditioner Repair Decision | HVAC Refrigeration Question

Replace HVAC Compressor for Air Conditioner Repair – Question – Richard – I am an HVAC technician and have read all of your articles on refrigeration and compressors. Great information and it has helped to hone my skills and offer better service for my customers. Thanks! I was wondering what your experience is with replacing compressors. How do you arrive at the decision to replace a compressor technically speaking of course? Do you recommend repairing the air conditioner by replacing the compressor or replacing the central air conditioner? I look forward to reading your answer. Brett Des Moines, WA

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Air Conditioner Condensing Unit Frozen | AC Repair 5/5 (1)

Air Conditioner Condensing Unit Frozen | AC Repair

Richard – Early last month we turned our air conditioner on and it worked fine for a few days. Then I noticed it was getting a little warm in the house so I went around and checked the Air Conditioner.

Air Conditioner Condensing Unit Frozen | HVAC Troubleshooting
Old Condenser

Of course I checked the thermostat first and then the air filter. I went up into the attic to look at the air handler. I did not notice anything out of the ordinary that I am not used to seeing but I am not an expert. Then I went out to the the condensing unit on the back patio and I saw some ice inside the condensing unit. The compressor and the all the pipes connecting to the compressor were a block of ice and frozen solid. I turned everything off and called the HVAC contractor I am used to dealing with. They told me they would send someone out to take care of it. A few hours after making the call I got a call from the technician. He told me there probably very little he could do for me now as we would have to let the ice melt before he could properly troubleshoot the problem. We agreed for him to come the next morning to check it out. He told us to leave the air handler blower fan on but make sure the condenser was off. He told me to go to the breaker box and turn the condensing unit off and use the thermostat for Fan Only operation. We did exactly as he said.

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Air Conditioner Components | HVAC Cooling 5/5 (1)

Air Conditioner Components

Air Conditioner Components | HVAC CoolingThere are big differences between heat pumps and air conditioners. While the air conditioner provides cooling the heat pump will provide heating and cooling so the components inside the air conditioner differ from the components inside the heat pump system. I constantly get emails from people asking if they can convert their air conditioner to a heat pump and of course they can but it is not recommended. I have even devoted an article to it for those who are considering converting their air conditioner to a heat pump.  After all, if you sit a heat pump next to a condenser it would be impossible to tell the difference from the air conditioner condenser to the heat pump condenser unless you looked inside the unit and was able to identify the different components from a heat pump to an air conditioner.  Here are the basic components of an air conditioner that make the air conditioner cool your home or business.

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Delay Timers and the Air Conditioner Condenser | HVAC Control 5/5 (1)

Delay Timers and the Air Conditioner Condenser - Unit with the top off - condenser fan motorDelay Timers and the Air Conditioner Condenser – Heat Pump Condenser

Air Conditioners are big HVAC refrigerators. Air Conditioners and Heat Pumps use the HVAC refrigeration cycle to transfer heat from a place where it is not wanted (inside absorbing heat with the evaporator coil) to a place that makes no difference (outside using the condensing unit)(in the cooling cycle). The heart of any HVAC air conditioning, heat pump, or refrigeration system is the compressor which pumps the refrigerant through the HVAC air conditioning system. When the refrigerant leaves the compressor it is compressed and therefore a higher pressure than it was before it entered the compressor inside the condensing unit. This pressure remains constant (give or take under certain conditions) until it passes through the metering device where the pressure and temperature are reduced. This low pressure remains constant (again give or take under certain conditions) until it again reaches the compressor inside the condensing unit and is compressed again.

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Air Conditioner Condenser Electrical Components – HVAC Cooling 5/5 (1)

Air Conditioner Condenser Electrical Components

What you will learn from this article Air Conditioner Condenser Electrical Components:
1) Brief description of air conditioner condenser electrical components
2) Code requirements for the condensing unit feeder circuit, fuse box, and wire running to the condenser
3) Wiring inside the condenser
4) Description of various electrical components inside the condenser
5) Lots of resource and related links to help you learn more

Air Conditioning and heating equipment uses high voltage. Caution is always advised when working around high voltage. When in doubt call a professional. Safety First!!

There are many electrical components inside an air conditioner unit.air conditioner condenser electrical components From relays to contactors to electric motors and wiring. It all works together to make your air conditioner run smoothly. It is almost like a ballet and the air conditioner sequence of operation follows a specific sequence to work properly  For the purpose of brevity the focus of this article will be on the condenser and the electrical components in an air conditioner condenser. From the disconnect box on the wall next to the condenser all the way through the control panel and into the components we’ll cover all the various electrical components and how they work together to make your air conditioner work.

Related Link: Read more about condensing units (opens in a new window)

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Air Conditioner Sequence of Operation | HVAC Cooling 5/5 (1)

Air Conditioner Sequence of Operation | HVAC Cooling

Air Conditioner Sequence of OperationAir Conditioner Sequence of Operation – When a technician is troubleshooting an air conditioner problem it is important that the technician understands the sequence of operation for that equipment. When there is a problem with the equipment, including air conditioners, the technician will know the problem if the equipment or air conditioner does not follow the sequence of operation. Sometimes it is that easy and other times it is not that easy when troubleshooting any type of HVAC equipment. However, it is important to understand the sequence of operation for an air conditioner so the technician can troubleshoot the air conditioner system.

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Compressor Overheating Troubleshooting | Air Conditioner Repair 5/5 (1)

Compressor Overheating Troubleshooting | Air Conditioner Repair

What you will learn from this article:
1) Avoiding the problem of compressor over-heating
2) how does compressor overheating effect the refrigeration system?
3) diagnosing compressor overheating
4) repairing the problem of compressor overheating and future prevention
5) lots of related links to help you learn

Compressor Overheating Troubleshooting | Air Conditioner Repair – There are some problems with air conditioner or heat pump compressors that can be avoided with proper maintenance. Other problems result in a mechanical or electrical problem with the systems that need to be resolved. Compressor overheating is an issue that can cause serious problems with your air conditioner or heat pump system. Compressor Overheating Troubleshooting - Diagnosis and RepairA compressor that overheats can still operate and provide cooling or heating but if the temperature inside the compressor rises too high then the oil in the compressor can break down and reduce the lubrication and cooling effect the oil has inside the compressor for proper and necessary lubrication. This leads to possible mechanical failure and other problems that will occur to the compressor and in the refrigeration system that results from compressor overheating. When the oil becomes overheated it changes chemically. Through a lack of lubricating and cooling it becomes like an acid when the oil overheats. This eats away at the windings and will cause compressor failure.

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Evaporator Coils Dirty and Ice On Air Conditioner 5/5 (1)

Evaporator Coils Dirty and Ice On Air Conditioner

Dirty Evaporator Coils and Ice on Air Conditioner
Dirty Evaporator Coils

Evaporator Coils Dirty and Ice On Air Conditioner – It was a very hot day and I got a ticket to respond to a call for no cooling. The customer said there was ice on the air conditioner. The secretary instructed the customer to turn the AC off so the ice could thaw before I got there to figure out the problem. It needs to be thawed before any AC troubleshooting can occur. There are two main causes why the evaporator coil will freeze and cause ice on the air conditioner. One is decreased or no air flow and the other is a low refrigerant charge.

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Proper Humidity Levels and Factors for Home Comfort & Health | HVAC Health 5/5 (1)

5/5 (1) "> moist and dry air problems & health

Proper Humidity Levels and Factors for Home Comfort & Health – The Contents and Make Up of Air and Humidity

Proper Levels of humidity Factors for Home Comfort and HealthHumidity is important to our home and health and it is important to maintain the correct humidity in our homes and workplaces for our health. What is humidity? Humidity is simply little water droplets in the air. Cold air is nearly saturated with these little water droplets because the contents of cold air allow the air to hold more water droplets or humidity. As air is heated it expands and holds less humidity. When you heat the air in your home using a furnace, boiler, or heat pump this air expands and becomes drier. It is air with less humidity relatively speaking before it was heated and compared to the outside air. Air that is 30° F with 80% humidity will only be 15% humidity at 75° F. That is a big difference in humidity levels in the home after the air is heated. Granted, you are not heating air from 30° F to 75° F with your furnace. Depending on the set up of your thermostat and heating system you are most likely heating air that is 68° F to around 70° F to 75° F depending on the thermostat setting. The point is unless you have a source providing humidity to the air stream you are simply reheating dry air from inside the structure. There will be minimal infiltration humidity but the infiltration humidity will never be enough to bring the humidity levels up to healthy levels inside the structure for the inhabitants, plants, and furniture.

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Humidifiers and Comfort – HVAC Healthy Living 5/5 (1)

Humidifiers and Comfort

Humidifiers and Comfort  – It’s winter time, and your skin and sinus’s are dry. Did you know that this condition not only extends to yourself and your health but also to your home? The furniture, doors, and other wood products in your home are all affected by the level of humidity.

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Humidifiers and Comfort
Ever notice in the winter time the doors don’t close just right inside your home? Ever get static-shock when you touch something or someone? This is caused by dry air. The solution is a humidifier. There are many types of humidifiers from portable to fixed. The prices for these humidifiers also vary. Naturally the fixed will cost more and you will most likely have to hire a contractor to install it, but the humidifier will definitely make a big difference not only for your health, but also for your home.

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Home Humidity Problems Maintaining Proper Humidity | HVAC Health 5/5 (1)

Home Humidity Problems – Is 60% Humidity in the Home Too High?

HIGH HUMIDITY 60 % +. Within the last month, I moved into a new house. It has dry walls and not plaster walls. The furnace and hot water tank were installed a week or so before we moved in to the house. Last week we determined that there is a humidity issue when the windows were sweating. We are trying to determine the source of the humidity. The contractor feels it may be the high efficiency furnace. I have a Lennox g61mp. The combustion air is pulled from within the un finished basement. Should the air be pulled from the outside? The gases are vented via PVC pipe which slopes back to the furnace.

Could the furnace be causing the humidity problem? If no, what else could be causing the humidity problem? The installer said it is not the furnace.

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Air Conditioner Condensation Water Dripping – Condensate Leaks 5/5 (1)

Air Conditioner Condensation Water Dripping

Air Conditioner Condensation Water Dripping – It’s the heat of summer or even the beginning of the season when you first turn on your air conditioner. Hopefully you’ve already had all the preventive maintenance checks done and there are no problems. Everything is working fine at least for now. Suddenly you notice water around the air conditioner and you know you have a problem. This problem is often referred as an air conditioner condensation water leak and often customers call an HVAC contractor and say their air conditioner is leaking water. This is not a unique problem and many people have dripping air conditioners during the season. Here are the likely reasons why your system is dripping water. Hopefully the AHU evaporator coil is not in an attic because you could be buying a ceiling unless precautions were taken. Your air conditioner has a condensate problem.

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Condensing Unit Frozen Wont Turn Off 5/5 (1)

Condensing Unit Frozen Wont Turn Off

What you can expect to learn from this article: this article is an answer from a question taken from our email by a visitor to High Performance HVAC. We often use the questions we get in the email as a guide to write articles. The topic is a condensing unit that will not turn off and it is freezing up. From my experience in the field and using my HVAC knowledge I offer the readers a list that could cause this problem. We hope it helps you.

What’s the possible problem with a frozen air conditioner condenser that won’t turn off except with the breaker?

Related Link: Here is a similar but different problem with a frozen air conditioner.

The Answer for frozen air conditioner condensing unit that won’t turn off –

There are 3 possible problems with this unit and will probably need the attention of an HVAC Technician for repair. Here’s the 3 possible problems:

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Air Conditioner Condensate Problems – Condensation Drain Plugged 5/5 (1)

Air Conditioner Condensate Problems

Labor time (approximate): 1 hour in some cases, several hours in others

Air Conditioner Condensate Problems – Condensation Drain Plugged
New Air Handler with Secondary Condensation Pan Under Unit and Showing the Float Switch

Air Conditioner Condensate Problems – It is important for air conditioning preventive maintenance to be performed on your system to avoid problems. Condensation water leaking near the air handling unit can be avoided with proper air conditioning repair and preventive maintenance. Normally this is a very simple problem that can be fixed in less than 30 minutes. Here is a list of what can cause water around the outside of the air conditioning air handler unit.

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Air Conditioner Condensate Problems – Possible Causes

  • The black insulation (called Rubatex) has a tear in it or doesn’t cover the entire suction line. This line normally (in Air Conditioning air condition mode) operates below the dew point and will sweat if it is not insulated. It must have a sealed vapor barrier to be effective.

Nu-Calgon 4296-60 Pan-Treat Scum 200 Tablets to prevent drain clogs for condensate pans available here

Air Conditioner Condensate Problems – Condensation Drain Plugged

  • The insulation surrounding the air handler supply transition or ductwork is torn. The supply transition and duct can operate (under the right conditions) below the dew point and sweat. It is important that the transition have a vapor barrier around it. This scenario is especially true for those that have over sized units.

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