why does my AC psi fluctuate & compressor turn on & off

Dislikes Received 0 Knowing the refrigeration cycle is the first step to understanding what’s going on in the lineset. When in the heating mode and the 4-way valve shifts, the high pressure gas from the compressor is redirected to the “condenser” which in the heating mode is the INDOOR coil. So how do you know the actual pressures? All HP manufacturers install a second access port for at least the suction line that is connected to the suction line between the 4-way valve and the compressor. Some manufacturers also provide a similar access to the liquid line but in reality, that’s a duplicate because you’ll always be reading the high pressure liquid at either the normal service port or the auxilliary HP liquid port. That port might also be labelled ‘LO’ for low pressure. Nobody intended to insult you but we do get a whole lot of do-it-yourselfers on this website and sometimes we all get a little fed up with those who think they know it all and want to demean our profession by thinking they can do it after a simple question. If you’re a newbie to the industry, welcome. We need lots more of you and congratulations for asking about what you don’t know.

How To Diagnose My Car AC Compressor Not Turning On

Co-founder Bryan Orr explains how you can understand, check and set refrigerant charge. Make sure to sound off in the comments or leave us a V oicemail. If you do, you might end up on our Podcast! So depending on the type of refrigerant that you have, depending on the temperature conditions, depending on the pressure, all those things affect the ways, one affects the other.

The lower end of the bi-metal strip is fixed.

Gauges are used to read the pressure of various liquids and gases in a cooling system, as well as vacuum pressure when you are pressure testing or charging the device. There are a number of different ports on the HVAC gauge set, also known as a manifold, and the main difference in the types of manifolds is the number of ports that you have available to attach accessories to, as well as the pressure that the gauge set can withstand, which is important when working with different refrigerants.

Step 1 Connect the high pressure side of the cooling line to the red port on the gauge. The red port and red gauge are always the high pressure gauges. You will want to attach a code-approved red hose, which is made to withstand high pressure, using the flare fittings that are included with it, to the high pressure port on the cooling unit. The high pressure port is typically of a different size and thread pitch than the low pressure side in order to avoid the potential for accidental incorrect hookups.

Step 2 Connect the low pressure side to the blue port on the gauge. The low pressure side will be connected with a blue low pressure hose to the blue pressure gauge and the low pressure side of the cooling unit. This will allow for the proper flow of vacuum pressure or a micron meter in order to determine the vacuum pressure in the system already. Step 3 Attach a waste hose or vent hose to the center of the manifold set up.

How to Use a Refrigerant Gauge Manifold Set

The low pressure gauge or compound gauge is color coded blue and the high pressure gauges are color coded red. The AC gauge hoses are color coded in blue, yellow, and red. The AC gauge hoses port are not color coded, but the hose is color coded. The blue hoses are used to connect the manifold to the low pressure side central air units suction line.

Some manufacturers even color code the hand valves. The manifold gauge uses flexible hoses with connector on both sides.

Open the valves on the manifold set, then check low and high pressures on the dials, comparing the readings to the normal range of the operating pressures specified in your owner’s manual or repair guide.

Add a caption Air conditioners have become essential in most homes. People run them throughout the warmer months of the year in order to keep their family comfortable. However, as these air conditioners run, it is possible for them to start not working properly. It is important to know what things can cause problems with your AC unit, so you can keep yours running perfectly.

Are you sure you want to remove this section? Common Issue As refrigerated air runs through the AC lines, it is possible for the air conditioning lines to be gummed up with excess moisture. Once these clogs have been removed from the air conditioning line, you should notice a big difference in how well your unit functions.

However, you must first find out how to hook up an AC vacuum pump in order to make sure you do not do more harm than good to your air conditioner. Gathering the Right Tools Before undertaking any home improvement projects, it is imperative that you have the correct tools on hand for the job. With hooking up an AC vacuum pump, there will be areas of the air conditioner that you will need to reach and can only do so by opening up the unit.

Therefore, you will need tools that will help you do this such as a wrench. You should also make sure that you wear protection for your eyes as well as your hands in the event that chemicals from the air conditioner could get on you. Hooking In The main thing you will need to do before you can hook up an AC vacuum pump is make sure you have turned off the unit. You should never work with an electrical appliance unless it has been turned off, so you do not run the risk of harming yourself.

How To Use An A/C Manifold Gauge Set

These are some general HVAC service techniques I’ve picked up over the years, and I’ve written this page hoping these tips will help technicians who are just starting out in our trade. If you’re looking for a more detailed, step by step troubleshooting guide, you might want to take a look at some of the other pages on the site.

Start out by getting focused.

The process is actually quite simple and only requires a set of gauges and some trial and error.

Asker’s rating Sorry, but EPA will hang you if your caught. It is illegal – on a Federal level – to attempt to do this yourself unless you happen to be an EPA certified technician. In addition only certified technicians can purchase refrigerants. Retail and wholesale outlets that sell refrigerants to the general public can be fined and criminal charges can be filed against them. There are three levels of certification depending on the type of work the technician performs and there is a seperate certification for automotive repair.

For those that want more information try www. The process of adding or deleting refrigerants from a system are controlled by law and the procedures for which are specified by law. Even if these laws were not in place, the process can be dangerous. No two refrigerants are the same and no two refrigerants are designed to be mixed.

Improperly mixed refrigerants can be explosive and can become poisenous gases. All refrigerants must be recovered and either reclaimed or destroyed by a licensed reclamation center.

Electric Fuel Gauges

Marine engine technology has evolved. Mercury Marine continues to expand its outboard and marine engine technology. The outstanding warranty coverage on Mercury engines also extends to the controls and rigging components on your boat. If your builder or dealer uses genuine Mercury gauges and controls when installing the new engine on your boat, the warranty coverage for those rigging components now matches the total warranty of your engine.

Mercury’s patented Joystick Piloting System delivers degree directional control.

It is necessary with the exception of ice cube machine applications to use the designated suction tube.

This how AC gauge works? What is air conditioning gauges manifold? Air conditioner gauges is chamber device that is design to control the flows of pressure or gases. It holds both compound and high pressure. This is what refrigeration manifold gauges look like: The AC manifold gauges set have the three chambers: When technicians connect the HVAC manifold gauge to the air conditioner units, he connects the low pressure side of air conditioner unit to low pressure gauge side. If he wants to read the pressure in discharge line he connects the high pressure gauge hose to the air conditioner high pressure side.

The utility port the middle chamber is a place where we connect the hose to vacuum pump, recovery units or the port to add or remove refrigerant from AC units. Air conditioning gauges is used to measure air conditioner units pressure within closed-system to evaluate or troubleshoot the central air units. Gauges manifold set is the most frequently used item when it comes to refrigerant or pressure.

Air conditioning gauge set allows the HVAC technician to check central air conditioning unit operating pressures, transfer Ac refrigerant , pressure test system, purge the system with nitrogen, and perform other necessary tasks. The gauges manifold set includes the hoses, the manifold, the valves, the compound gauge low pressure gauges and high pressure gauge.

Bring Your Van Camper to Life: How to Add Batteries and a Solenoid to Your Stealth RV

Previous topics in the series include: You never want your vehicle battery to be doing the work that the secondary batteries should be doing. The house battery solenoid needs to be energized all the time while the engine is running. If Possible Use the Fuse Panel to Power Your Solenoid Your vehicle should have a fuse panel under the hood or behind a plastic lid under the dashboard.

The male half of the spade terminal will plug right into a vacant fuse slot on most vehicles.

The high pressure port is typically of a different size and thread pitch than the low pressure side in order to avoid the potential for accidental incorrect hookups.

Click to jump to this section. Karmann Ghias and Buses had them even before this. The gauge used on the Beetle from ’68 onward is a thermally-actuated design. It is not a new concept; Ford used gauges similar to this as early as the ‘s and it probably goes back even further. Here’s the basic concept: The rheostat varies the current flowing into the fuel gauge on the dash. Inside the gauge, a tiny heating element responds to the rheostat current.

When fuel level is high, current is at a maximum and the heater gets hottest. The heater is wound around a small bi-metal strip ; heater warms up, the strip bends or “warps”. The picture above shows the gauge as it is mounted in the speedo housing.

Boat Building Standards

Recommendations for refrigeration gas pressure measurement using a test gauge set. We have no relationship with advertisers, products, or services discussed at this website. We describe the procedure for using test gauges when adding or replacing refrigerant:

A vacuum gauge can tell as much about the internal and external workings of an engine as the combination of a voltmeter, compression gauge, stethoscope and timing light.

Compact, hand-held manifold gauge sets are used universally when servicing home air conditioning systems as well as automotive ones, and professional technicians use them same way you can in your back yard. Although shops typically have large, costly machines that do the evacuating and recharging work, similar results can be achieved with equipment that can be purchased inexpensively and stored easily. A manifold gauge set will also let you determine if your system is fully charged or not, or if your system is losing pressure at a rate that indicates there is a large leak.

Even if you won’t be servicing the system yourself, it will help you determine whether you need repairs or just a recharge. The blue hoses, gauge, and valve knob represents the low pressure side of the air conditioning system, and red ones represent the high pressure side. The yellow hose in the center is designed for recharging the system with canned refrigerant or evacuating the system. While some vehicles made a switch to newer R a refrigerant before they were required to, any model year vehicle sold in the United States was designed to operate on R a.

Gauges & Displays

I would suggest you try to find the manufacturer of your tachometer on the web and check out their support site and email them if needed for your particuliar vehicle. For instance below is a link to Autometer’s Tech Tip web site however unless you own an Autometer Tach this may be useless to you. Th…ere are so many different ignition systems today that it would be difficult to explain each. So its best to get the info from the pro’s.

Once you’ve added the full charge, check the pressures one more time to ensure that are where they should be.

Understand the Laws Regarding Working on an Air Conditioner 1 Know what it is legal for an unlicensed homeowner to do to their own equipment. There is no national or federal law regulating what a private citizen can do with their own air conditioner. There are, however, laws requiring professional certification by the U.

Environmental Protection Administration and state and local regulations regarding licenses and professional standards for persons doing this work. You may find a source online, at sites like Craigslist and eBay, but the actual purchase may still be illegal. Method Check the System 1 Perform routine maintenance first.

How do you read R22 gauges

Now that I think of it I tried purchasing a recharge kit for my truck , but they cancelled it when they saw I lived in California. Thank-you , Jerry Brown! For example, it is permitted to sell small quantities of a to the unlicensed general public. The second paragraph “Refrigerant Sales Restrictions” in the Section summary states:

Air conditioning gauges is used to measure air conditioner units pressure within closed-system to evaluate or troubleshoot the central air units.

We will be adding information to this area on a regular basis. Feel free to send your comments. You may contact us directly, toll-free at: It goes something like this. My air conditioning was working last week, and then it quit working. What do you think is wrong? Or, maybe something like this I added some refrigerant to my car, and it still won’t get cold. What could be wrong? Well, unfortunately, questions like that are almost impossible to answer without detailed information. That’s where the manifold gauge set comes into play.

We use a manifold gauge set to get more information about what’s happening inside the system. We created this FAQ to help answer some of the most common questions we receive on using a gauge set and hopefully provide some explanation on pressure readings. As a prerequisite, anyone interested in learning how to use a gauge set should first take a few moments to learn how the refrigeration cycle works and understand how refrigerant flows through the system.

Proper Way to Hook Up Manifold Gauges