[mrpman]

OK, First time in the forum ,,,so thanks to everyone for help in advance.

I am trying to figure out if my AC unit is realy working OK.

First, I have a York Residential Split A/C System - Indoor Coil G1FA series
outdoor unit - 1 to 5 ton, 10,12,13 or 14 seer?
Unit is about 9 years old


I made some temp measurements and would like a sanity check to see if the unit is working OK.

Outside Air Temp -97 deg

These measurements were taken only a foot or two from inside coil.

Intake Air temp - 76.8 deg
Output Air Temp - 60.6 deg

High Pressure small copper line - 116 deg
Low press Large copper line - 57 deg


Even at night (70 - 80 deg outside air temp), the air temp 5 feet from inside coil does not go below 55-56 deg


Some History......

When unit was new, the builder hired company wired thermostat wrong, so first few months during winter when I was running the heater, the A/C compressor outside would also be on. Yeah the heater and AC was running at the same time.

They came out, fixed wiring and maybe topped off freon in system. This was 8-9 years ago.

Also all GE capacitors both inside (fan blower) and outside A/C unit have gone bad. Don't know if it was power surges or blackouts we have had over the years. I am an EE so I replaced the starter and run caps on the outside unit with separate ones (GE cap outside was combo unit).


Anyway..... Are these temps typical? Seems like unit runs for hours just to take house down a few degrees.

 

[log_doc_rob]

Unit is at least 9yrs, has it been properly serviced.....cleaning the inside and outside coils? Check the filters? What is your stat set on and what is the indoor temp? Also, where are you located, humidity level?

 

[JJboy]

We need pressures at small and larger copper line.

looks like is running with low refrigerant

 

[mrpman]

Outside Coils have been cleaned recently.
Filter OK.

I don't have any pressure measurements. Are there taps for measuring pressures like on an automotive system?

Unit has not been serviced since it was new.

 

[mrpman]

Location - On East coast near Philadelphia.

 

[log_doc_rob]

9yrs old and never been serviced, could be low on refrigerant, A-coil is probably dirty along with the fins on the blower being clogged with dust.

 

[mrpman]

"A-coil is probably dirty along with the fins"

Not sure which coil you are talking about.

I clean the fan unit regularly, blower is fine.

Outside coil was cleaned out recently. I vacuume out codensate tray and inside coil.

AC unit has always been like this, Air temp never under 55 deg, makes sense if supply line of cold refrigerant is ~57 deg.

They may have never charged correctly in the beginning, never trusted guys who installed system.

They used roofing nails on ductwork, after a month both main duct trunks were falling down.

I am just trying to get an Idea if a typical home unit should go colder than 55 deg.

 

[log_doc_rob]

Your A-coil is inside the plenum and looks like this. You may have to take off the triangular piece of metal off the end to access the interior of the coil, that's where the dirt gets trapped.

http://www.diychatroom.com/f17/how-clean-evaporator-coil-central-c-when-sits-top-furnance-76469/