AC Unit Running All The Time Data Captured... - HVAC - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > HVAC


Thread Tools Display Modes
Old 07-23-2008, 09:56 PM   #1
Join Date: Jul 2008
Posts: 2
Rewards Points: 10

AC Unit Running All The Time Data Captured...

Hopefully someone can help me troubleshoot my problem. My Carrier unit runs all the time during the day and sometimes falls behind keeping up with the set point on my T-Stat.

Details listed below:
4 Ton Single Zone System made by Carrier and installed in 1996
Single Family Home 1975 Sq Ft two story cathedral ceilings

Today’s Readings at 5:00 PM
Oustide Air Temp 80 Degrees
Suction Temp At Condenser – 59.2 Degrees
High SideTemp At Condenser – 83.8 Degrees
Suction Pressure – 66 psi.
High Side Pressure – 255 psi.

R-22 Freon
I calculate my superheat at 20 Degrees

This evening my return temp at the return grill was 64 degrees and the supply temp at a register was 56 degrees. Only 8 degrees differential

Is this unit low on Freon? Or is there something else going on?

Any help would be greatly appreciated.


GeorgeCJ is offline   Reply With Quote
Old 07-24-2008, 12:32 AM   #2
HvacWiz's Avatar
Join Date: Nov 2006
Location: Northwest Ohio
Posts: 287
Rewards Points: 252

The head pressure seems a little high for a 80 degree day, should be around 210-220 psi. Have the condensor coils been cleaned recently?


HvacWiz is offline   Reply With Quote
Old 07-24-2008, 06:04 AM   #3
Join Date: Jul 2008
Posts: 2
Rewards Points: 10

They have not been cleaned but they look quite clean and the filter of cource is new.
GeorgeCJ is offline   Reply With Quote
Old 07-24-2008, 08:51 AM   #4
Join Date: Jul 2008
Location: Houston, Tx
Posts: 15
Rewards Points: 10
Send a message via AIM to ssporty21228 Send a message via Yahoo to ssporty21228

Use coil cleaner from a a/c parts house, the kind that comes in a gallon jug that's concentrated. The directions say to mix it with 1 part cleaner and like 5 parts water, but the owner who also services a/c's said to use a gallon pump spray and mix it 50/50 (or you will have to repeat this process several times). I took the top off my trane and sprayed this stuff on the inside of the coil....this stuff foams up like crazy and be careful on a windy day not to get this stuff on you. I thought I had clean coils til I used this stuff, all the foaming action actually revealed all the grap that had accumulated on my condensing coils thru the years. You wait about 5 mins then gently rinse with a water hose. Afterwards, the temps coming out of my vents lowered about 5 degrees.
ssporty21228 is offline   Reply With Quote
Old 07-24-2008, 08:36 PM   #5
Join Date: Jun 2008
Posts: 152
Rewards Points: 150

super heat high 20

sub cool 35 . you either have a very dirty evaporator coil and assuming you dont are the gauges fluttering if so you have non- condensables . simple test is to turn the system off let it sit for 1 hour or so and put your gauges on the saturation temp of the refrigerent should equel the out door temp on the dot ,if not you have none condensable gas in the system this can cause ice in the lines causeing temp. restrictions . if thats good you likely have a plugged expansion device these can be cleaned if its a piston if its a txv they need to be replaced
geo fan is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Radon Mitigation installed near AC Unit outside. Problem? majorchamp General DIY Discussions 16 06-30-2008 01:44 PM
Help! A/C leaking big time IncHulk HVAC 5 03-29-2008 08:27 PM
taco 700 constantly running.... drizzyboy HVAC 3 11-27-2007 07:03 AM
AC Unit Continuously Runs - yet it is cooling reefland HVAC 4 06-17-2007 07:04 PM
Installing A/C ducts, then A/C unit at another time ... robertmazzo HVAC 2 08-14-2006 12:46 PM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1