I live in an apartment building for the last 5 years and my 25-30 year
old central air unit died (compressor). Now the unit was replaced with
a SEER 10.0 unit and I can no longer get the apartment down below 73-74
even at night. Is this normal?
Now I have done a bunch of Google work over this and I have read the
little tube (HIGH SIDE) should be warm to hot to the touch but mine is
not. Matter of fact its room temperature at best but the big tube (LOW
SIDE) is cold like a soda that was just pulled out of the
refridgerator. What should the little hose feel like and if it should
be hot what can I tell my maintainence men so they will take me
seriously that there is a problem.
With 2-3 computers running in this room 78 degrees F is unacceptable
when the previous 4 summers it was 70-72 in here (would get down to 62
easily if I let it at night or 66 in the day).
Thank you for any advice you can offer.
Hello, no one from the net can see your system. I know you tried to provide
Maybe we can go a step at a time.
Take a thermometer and get the temperature difference between the supply air
and the return air.
temperatures. The temp difference is your Delta-T.
Tell your maint man, "here is my Delta-T reading". Now your using a tech
term and sound like you know something.
Report back as needed.
An airconditioning system should provide an indoor environment of
approx. 15-20 f lower than the outside temperature at the time 'if' it
is properly sized and functioning correctly. The last poster gave you
a very good way to check the systems effectiveness . Do that, and let us
know. Keep in mind, that, if you have alot of heat generating equipment
in your apartment, then you may have increased the cooling load beyond
what the system is capable of .
I think the PP meant to say that "an air conditioning system should
provide an indoor environment supply temperature of approx. 15-20 F
lower than the indoor return temperature at the time 'if' it is
properly sized and functioning correctly."
Here is what I am fighting with the maint dept over (all different
degrees of HVAC certifications).
#1 - When the outside unit was changed the evap coils were not (they
simply do not change them in any units in the 5 years I have been here)
yet this complex is 30 years old as was the now defunct unit.
#2 - the HIGH SIDE (small tube) is not even hardly warm but the upstairs
#3 - the compressor when running has beads of condensation on top of the
unit (as well as the normal sweat).
#4 - Its a 2 ton unit and this apartment is 1540sq ft (1400sqft livable
space...thats minus the master closet that is sealed and the sealed
utility storage room)
What can I tell these guys to make them make this right?
Btw: Thanks for all of this help.
Just from what I'm getting here, I'm wondering if there is a
partial restriction of the orifice. This isn't something a
home owner can check -- takes some tools and training. But
it would give those symptoms.
I hope they installed a new filter drier in the liquid
A restriction causing a low superheat? I think there may be a mismatch,
possibly insufficient coil size OR plugged A-coil - something in this
equation isn't right and it's awfully hard to tell from here.
Then there is part of your problem, as a 30 year old evap is not even close
to being matched to a new condensor. Thats a given.
That might point back to the fact that the metering device in the evap coil
wont be matched to the condensor.
It also might be the wrong size lineset for a newer unit. Each make
specifies the correct lineset sizes for the condensor, when matched to a
Thats not a good sign. Can you scream overcharge at the guy that installed
Also, you dont WANT the compressor sweating. IT COULD again point back at
the evap coil, and thats probably 60% of the problem.
the other 40 is charge conditions....
Have them check the superheat, or subcool, depending on the metering device
in the evap. IF they have a clue, they will know what that is...there is a
chart on all modern units on the access panel to the condensor that will
have the correct chart.
The superheat, subcool, and/or hot gas discharge temps will be on the
OUTDOOR unit. Its new...so there is the information that a tech that has a
clue will need...to get started. In order to properly charge a unit, he
needs to know the wet bulb temp indoors, the indoor ambient, the outdoor
temp, and he can, IF he knows what he is doing, can charge the unit with
nothing but a hose from a jug of refrigerant and a good thermostat, reading
the temp on both lines back to the outdoor unit.
Slapping a manifold on the outdoor unit till he gets above 58.6PSI on the
suction side is WRONG.
I know the feeling. I just faxed over a copy of an estimate for taking over
the preventive service on a large company here...we actually DO what we say,
and after spending 4 hours there just looking these units over, its obvious
as hell that the company that was servicing them is a crook. They were
getting $5600 a month..(cheap actually for these units...air filters alone
cost wholesale over $2200) and they look like they have never been touched.
Shame too, since they probably think they are in GREAT shape, and wont like
my estimate of 6200....but hey...in this biz, if you have someone that has a
clue, do you get what you pay for...
Just wanted to let everyone know that they said my coils were fine (cut
me short before I could even finish my sentence) and all it needs is
So, I hope they blow this mofo to kingdom to come and wondering if there
is anything I can do to help it along so it blows itself to hell?
I really have a short fuse when I am dealing with idiots who refuse to
listen to the manufacturer and to sound logic (both had the same
Basically I hope while I am gone they fill up my unit as they are
supposed to and by tomorrow it goes KABOOM.
Once again thank you everyone who offered help I listened and learnt but
the powers that be could care less.
Ok...first of all, what is the brand and model number on the unit...( please
tell me its a York, Coleman, Fraizer Johnson, or some other UPG brand..then
I can send you the installation instructions you wont EVER see)
If its a Goodman, Janitrol, or GMC, all the same, I have the dealers manual
for that as well...
IF its a Carrier, or like brand, Payne, Bryant....I have those...
BTW, if its sweating at the compressor, thats not a good thing, and if they
add more to it, well....you might get your wish..:)
It is normal for a high efficiency unit to not be as hot on the high side,
they have larger condensers in them, that is what makes them more efficient,
kinda like having 3 cores instead of 2 on a car radiator.
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