Author Topic: A/C System Diagnosis  (Read 5218 times)

Offline JWWebster

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Re: A/C System Diagnosis
« Reply #10 on: June 05, 2009, 07:22:56 PM »
Or better yet just type some stuff in the box and we will look at the content not the grammar my amigo.
May the hinges of our friendship
        never grow rusty.

About the icons: The beer is tip link, if a tech saves ya some money buy em a 6 pack. The small green square=personal message. The green dot is a link to my web page on appliance repair and other general BS I love to post. The letter sends me email.
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Offline maypo52

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Re: A/C System Diagnosis
« Reply #11 on: June 05, 2009, 11:14:24 PM »
Here you go. Enjoy ;D

Diagnosing Air Conditioning System Problems

Superheat and Subcooling:

When running properly, the evaporator temperature and superheat should be within manufacturer’s specifications. This ensures that the compressor is protected from liquid flood-back and overheating as is common when high superheat is present.
Typically the condensers performance is effected by proper subcooling. If no manufacturer’s literature is available, rule of thumb is 10 degrees of subcooling on low SEER rated units and 15 degrees subcooling on the higher SEER rated units.

How to measure Superheat:

Measure the suction pressure at the inlet of the compressor.
                   This will give you evaporator saturation temperature

Convert the pressure to temperature using a P/T chart

Measure the suction line temperature six inches from the compressor
                   Use a digital type thermometer only

Subtract suction line temperature from saturation temperature, the difference is Superheat

How to measure Subcooling:

Measure the high side pressure at the liquid line service valve
                    This will give you the condenser saturation temperature

Convert the pressure to temperature using a P/T chart

Measure liquid line temperature at condenser outlet
                    Use a digital type thermometer only

Subtract the liquid line temperature from the saturation temperature, the difference is Subcooling

Ideally, systems should maintain a “delta t” (temperature difference) of 20 degrees between indoor and outdoor temperature.
My philosophies:

If it ain't broke, don't fix it and When all else fails RTFM (read the "funny" manual)

Offline JWWebster

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Re: A/C System Diagnosis
« Reply #12 on: June 05, 2009, 11:53:42 PM »
Otay thats fugged up :D Whatever
May the hinges of our friendship
        never grow rusty.

About the icons: The beer is tip link, if a tech saves ya some money buy em a 6 pack. The small green square=personal message. The green dot is a link to my web page on appliance repair and other general BS I love to post. The letter sends me email.
I love fan letters! LOL

Offline JWWebster

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Re: A/C System Diagnosis
« Reply #13 on: June 05, 2009, 11:54:36 PM »
Wad he say? :D
May the hinges of our friendship
        never grow rusty.

About the icons: The beer is tip link, if a tech saves ya some money buy em a 6 pack. The small green square=personal message. The green dot is a link to my web page on appliance repair and other general BS I love to post. The letter sends me email.
I love fan letters! LOL

Offline Icehouse

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Re: A/C System Diagnosis
« Reply #14 on: June 06, 2009, 08:45:33 AM »
 ??? I e mailed a copy to AJ, guess he could not open it either.
NATE, NCCER, PHCC,HVAC Certified Instructor
Member RSES, US Army Refrigeration Specialist(Retired), Former Refrigeration Teacher NYC Board of Ed.
a tragedy has happen to me : http://web.me.com/zenzoidman/Bobice/

Offline AJ

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Re: A/C System Diagnosis
« Reply #15 on: June 06, 2009, 12:36:19 PM »
??? I e mailed a copy to AJ, guess he could not open it either.

That's correct.
Hope you find our website helpful.

 

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