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Old 06-13-2012, 05:24 AM   #1
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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

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Old 06-13-2012, 06:42 AM   #2
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AC condenser frozen low superheat


Fix the leak

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Old 06-13-2012, 07:35 AM   #3
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AC condenser frozen low superheat


No visible signs of a leak, or are you saying with my reading so low this is a sign there is a leak?
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Old 06-13-2012, 10:15 AM   #4
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AC condenser frozen low superheat


Sounds like low air flow. What is your indoor temp.
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Old 06-13-2012, 11:29 AM   #5
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AC condenser frozen low superheat


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
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Old 06-13-2012, 01:03 PM   #6
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AC condenser frozen low superheat


Is temp at return at a return grille, or the return side of the coil.
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Old 06-13-2012, 01:31 PM   #7
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AC condenser frozen low superheat


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
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Old 06-13-2012, 01:33 PM   #8
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AC condenser frozen low superheat


Clean the coil, and make sure the blower is spinning at set speed.
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Old 06-13-2012, 02:31 PM   #9
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AC condenser frozen low superheat


Thanks, I'll clean the coil and check the blower speed.
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Old 06-13-2012, 04:27 PM   #10
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AC condenser frozen low superheat


txv or piston?
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Old 06-13-2012, 05:53 PM   #11
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AC condenser frozen low superheat


Piston
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Old 06-13-2012, 07:44 PM   #12
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AC condenser frozen low superheat


in that case: low air flow. Ensure all supply registers are open and not blocked. Ensure all return grills are open and not blocked.
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Old 06-13-2012, 08:38 PM   #13
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AC condenser frozen low superheat


Thinking more about it we put down hardwood floor and changed out registers with wooden registers smaller openings.
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Old 06-13-2012, 09:44 PM   #14
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AC condenser frozen low superheat


They really cut back on air flow.
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Old 06-14-2012, 05:56 AM   #15
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AC condenser frozen low superheat


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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