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Frost build up

Janitrol heat pump, 20 yrs old. Just added freon. Small leak repaired

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  • Jerome Barbin May 11, 2010

    Where are you seeing frost build up?

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Clean ur A coil system working to hard or to much freon

Posted on Apr 18, 2009

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What to do if you have a freon leak in the freezer


charge with detail (that is a Freon with Red dy solution to help locate your system leak) locate leak, repair using silver solder, evacuate system completely, pull vacuum down to 27" plus Lbs. vacuum, close system to hold vac pressure, monitor pressure for 30 minute or so, if vacuum hold pressure then you have successfully fixed your system leak, next hook up your system to the manifold gages assembly to a Freon supply source, all this while retainning your vacuum pressure, slowly crack open the valve on the manifold to allow the new freon to enter your system until you see pressure building up in you system, next monitor the discharge line i.e. the bigger line until you see frost extending outside of your freezer unit toward your compressor assembly, then close the freon supply valve, wait for a while to see if the frost line recede into the unit box, if it does not recede but stay out of the box or extend some more then you must must release some freon slowly a very small amount at the time until the frost line has regressed into your freezer box. this should complete your repair, good luck

Apr 24, 2012 | Kenmore 20.3 cu. ft. / 575 liter Upright...

Tip

How to add Freon to a Air Conditioner or Refrigeration System


Adding Freon to an air conditioner or refrigeration system takes very specialized equipment and years of experience...it would be impossible and irresponsible of me to try to tell you how to do it through a computer.

Let me explain this further….
In small refrigeration systems such as you have in a refrigerator or a beveage cooler, the amount of freon in the system can often be measured in ounces of weight. Many times, just a few ounces. To get these charged correctly takes tons of experience and very finely tuned equipment. Just removing the hoses can release enough freon to make the difference between the system working or not working. Very sensitive scales are needed to weigh in the freon. To make sure the correct amount of freon is in the system, the system must be evacuated to a complete vacum. You need to have a special pump to do this.


To add to this, most small refrigeration systems are factory charged and sealed. They do not have access ports built into the system. To do anything to these system an access port must be correctly placed in the system for proper evacuation and charging. Then also add the the equation the fact that if you need to add freon to your system, where did the exsisting freon go? Finding and fixing very small leaks also takes sophisticated detection equipment.

The next problem is the many different types of freon that are used today. Some equipment has the type used, very clearly marked, but many do not. Only knowledge and experience can tell what type freon is in the system, and then it can be very difficult sometimes.

Air conditioning systems can be a bit more forgiving, but are getting more and more difficult to analyze and figure out exactly what is going on. The many types of refrigerant and variable speed compressors are making troubleshooting very difficult. Add temperature sensors and variable speed condenser fan motors into the mix and it becomes a nightmare.

Heat Pumps are very sensitive to either under or over charging. The only correct way to charge a heat pump is to evacuate the system and weigh in the correct charge.

Leaks in heat pumps or air conditioners are often very difficult to find, also. But finding a leak and fixing to correctly is the only way to achieve a successful repair of an air conditioning or heat pump unit.

So hopefully now you can see that refrigeration, air conditioning, and heat pump system charging is not something that can easily be done without the proper training and equipment.
Oh, and did I also mention that it is illegal to handle and repair any type of system the contains any type of refrigerant with out a refrigerant handling certification in the United States? Yes, and the although rarely anyone has been charged, it still is the law.

Please call for a certified repair technician to repair any refrigeration system and do not try to do it yourself.

on Aug 18, 2010 | Refrigerators

1 Answer

2000 mazda 626 4 cyl a/c problem - unit runs for 15- 20 min then compressor shuts down. If you shut car down for 20 - 30 min a/c function will resume


Might be time to get some r134a freon added. When the car sit's it will build up pressure and when the pump kicks on it looses the pressure and goes into safety mode to not burn up the pump. If you do it yourself get the dye and pag oil also with the freon. It is very tricky to do it yourself so follow instructions carefully. Then check with UV light to see if it's leaking.

Jun 29, 2011 | 1999 Mazda 626

1 Answer

I hooked up a coleman electric furnace to a janitrol condenser heat pump . The t-stat wires on electric furnace are red white green and yellow. I added a blue for common off of transformer for digital...


Hi, first of all you need to get a hand full of 5 amp auto type fuses and install one on the hot leg of the 24 volt secondary side of the transformer. Just use 2 female crimp on connectors and put the fuse in the middle of the hot wire. Saves $$$$ on replacing transformers when you have a dead short on the low or high voltage side of any transformer, just a trick of the trade, food for thought. Fuses are much cheaper. On your electric unit, you may not need the common on this to operate the digital stat if it has batteries. This may be your dead short. On the Janitrol condenser, the red is your 24v as you no. They are using blue in place of yellow for cooling. Red is hot, W is heat, G for fan, and blue is cooling on this Janitrol. Keep in mind you are connecting to a heat-pump also, so make sure the wiring is correct. Are you installing this for secondary Heat?? More then likely, the blue common you have added is the dead short as the janitrol uses the blue for a cooling relay in place of yellow. Anyway, use the 5 amp fuse, trick of the trade to save on the transformers. Please keep me posted, as I know know you have this under control.
Shastalaker7
A/C, Heating, & Refrigeration Contractor. Good Luck!

Feb 09, 2011 | Coleman Heating & Cooling

2 Answers

Evap coils frost up for about the first 4 inches then no frost any further


This could be a low capacity compressor issue (It can pump the coolant down far enough to make it cold again. Or perhaps your coils in the back or under the machine are dirty and not able to dissipate heat. The last thing is that it could be low on coolant. If this is your main fridge, call a tech to take pressure readings to see if the coolant is too high or too low. Clean the coils in the meantime and see if anything changes.

Oct 30, 2009 | Amana ABB1927DE Bottom Freezer...

1 Answer

Freon has to be added for the 3rd year now in unit only 2 yrs 8 mos old. Installer cannot find leak in condenser or inside unit. What could be problem?


installer has no patients. leaks are hard to find if they are small. some times you must use soap and water to find small leaks bubbles will show quicker. or pull charge from unit and charge with nitrogen to a higher pressure and low side of unit may be where leak is coils can be a major problem for so many tubes to trace but time and patients is the answer. leak detectors that are used are great for larger leaks but if the detector isn't kept calibrated this go wrong, thats why i'll go to the old method of soap and bubbles

Aug 23, 2009 | Ruud Heating & Cooling

1 Answer

Hi, My Amana Refirg is about 30 years old-refrig on bottom freezer w/ice maker on top. The ice maker was skipping and would not stop by raising the arm. Consequently is ceased, now however the freezer is...


do you see alot of frost on the rear panel of the frzer if so it has failed to defrost and repair is req or do a manual defrost until a tech can get to you if no frost sorry sounds like you have a weak tired compressor or leak of freon and being 30 yrs old it is not cost effective to repair this item....

Aug 19, 2009 | Amana Refrigerators

2 Answers

18 year old Janitrol Heat Pump freezing up.


i would get someone to check your refrigerant levels have you ever had the evaporator coil flushed and cleaned? proper refrigerant levels and proper airflow across coils are extremley important not to scare you but 18 yrs is a long time on a heat pump 9-12 years is the point where they really loose there efficiency going for a newer one would probably cut your operating cost in half if not more depending where you live there are a lot of people not familiar with heat pumps so i suggest finding a company that specializes in them to service your unit

Jul 30, 2009 | Ruud UBHC Air Conditioner

1 Answer

Subzero Model 550, freezer not working properly


Blow out the condenser with an air compressor. Make sure the evaporator coil is not frosted up, if so, the drawer may naot have been closed properly, or you may have a defrost problem, (timer, terminator, etc). Possible freon leak in the high side drain loop. Compressor may not be pumping efficiently, could have a bad condenser fan motor.

May 28, 2008 | Sub-Zero 650 / O Bottom Freezer...

1 Answer

AC WON'T COOL


Sounds like you have a freon leak or your compressor has stopped working. You will probably need a service tech. If it is out of freon, don't let them just add more freon, make them find and repair the leak first. Good Luck.

Mar 27, 2008 | Intertherm P3RA-048K Air Conditioner

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