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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I installed a Lenox condensing unit today. I began to charge

Customer Question

I installed a Lenox condensing unit today. I began to charge it with R22 and the high side shot up as freon was going into the system. Now, it's pulling the hot air from inside the home and condensation is flowing from the drain line but, i cant get it
to take a full charge, nor is it blowing cool air. What are some of the thing's i could try..?
Submitted: 2 years ago.
Category: HVAC
Expert:  airheatman replied 2 years ago.
What is model on unit and what indoor do you have it marched with?
Customer: replied 2 years ago.
Lenox..10ACC-042-230-04 outside
Concord airhandler.......................inside
Expert:  airheatman replied 2 years ago.
What is suction pressure doing and did you pull a vacuum on stsyem?
Customer: replied 2 years ago.
I did pull a vacuum.
Both lines are room temp.
The amazing part is, there's condensation coming from the drain line but barely cold air coming thru the vents.
Expert:  airheatman replied 2 years ago.
THat is strange, Tell me what suction and head are both reading currently
Customer: replied 2 years ago.
Everytime i go to add freon, the highside reaches 400 and the low side is reading a low charge.
Expert:  airheatman replied 2 years ago.
Sounds like you have a restriction somewhere in the circuit.What type of metering device is on the indoor coil?
Customer: replied 2 years ago.
Its a piston
Expert:  airheatman replied 2 years ago.
I would pimp refrigerant down, remove that psiton and clean it good as well as make sur it is open and nothing clogging.then pull another vacuum and see if any better.It sounds like there is a partial blockage somewhere allowing some refrigerant through but not sufficient.
Customer: replied 2 years ago.
Thank you..
I'll give it a shot.
Thanks again.
Am i allowed to ask an additional question, pertaining to the tstat that controls the unit?
Expert:  airheatman replied 2 years ago.
Customer: replied 2 years ago.
This is a problem that i havent been able to rectify and i thought this was the cause of the initial problem.
The contactor wont pull in, unless i push it in manually. Once i push it in, it stays in and the system wont go off unless i pull the disconnect. The tstat controls nothing
Expert:  airheatman replied 2 years ago.
OK do we have 24 volts at the contacor coil when thermostat ca;lls for AC?
Customer: replied 2 years ago.
Customer: replied 2 years ago.
Well, until next time.
Expert:  airheatman replied 2 years ago.
If you have 24v to contactor coil but they do not pull in I would replace contactors

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