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-   -   AC condenser frozen low superheat (http://www.diychatroom.com/f17/ac-condenser-frozen-low-superheat-146901/)

timbo61 06-13-2012 06:24 AM

AC condenser frozen low superheat
 
I am having trouble keeping my ac from freezing, I have checked the obvious things "filter,dirty coil or condenser" but my super heat reading seem low but suction line continues to freeze. any ideas would be helpful thanks.

low side pressure 54 psi 29 degrees
suction line temp 35 degrees
outside air temp 75 degrees
super heat = 6 degrees

my reading it should be around 12-15 degrees
I've tried adding Freon (R22) but my temps drop on the suction line which makes my super heat lower, originally I have a 8 degrees super heat.

My sub cooling
180 psi 96 degrees
liquid line temp 96 degrees

jkv 06-13-2012 07:42 AM

Fix the leak

timbo61 06-13-2012 08:35 AM

No visible signs of a leak, or are you saying with my reading so low this is a sign there is a leak?

beenthere 06-13-2012 11:15 AM

Sounds like low air flow. What is your indoor temp.

timbo61 06-13-2012 12:29 PM

Yes, I suspected this also, I looked at coil it was clean, and made sure all registers and returns were open.
Temp at coil = 65 degrees
Temp at return = 79 degrees

beenthere 06-13-2012 02:03 PM

Is temp at return at a return grille, or the return side of the coil.

timbo61 06-13-2012 02:31 PM

Sorry at grille, actually I checked it the humidifier opening, I closed off the duct and checked it before it comes into the furnace 79 degrees and leaving furnace 65 degrees

beenthere 06-13-2012 02:33 PM

Clean the coil, and make sure the blower is spinning at set speed.

timbo61 06-13-2012 03:31 PM

Thanks, I'll clean the coil and check the blower speed.

hvactech126 06-13-2012 05:27 PM

txv or piston?

timbo61 06-13-2012 06:53 PM

Piston

hvactech126 06-13-2012 08:44 PM

in that case: low air flow. Ensure all supply registers are open and not blocked. Ensure all return grills are open and not blocked.

timbo61 06-13-2012 09:38 PM

Thinking more about it we put down hardwood floor and changed out registers with wooden registers smaller openings.

beenthere 06-13-2012 10:44 PM

They really cut back on air flow.

jkv 06-14-2012 06:56 AM

timbo61, sorry about my comment, I should have been more help to you. Found out my wife has thoat cancer so my mind is not dealing with very well. Beenthere thanks, your the one that help me with the 404a freezer problem, I changed out the valve body and it is running right now, they had the wrong size body with a 3/8 plunger in it.


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