Is my new AC working correctly?

[zly]

I just had my AC replaced with new Keeprite Softsound 1000+, 2 tons. I do not think it is working good because I don't feel "very cold" as what I thought. So I checked the temperature after the AC has been working for 4 hours:
Out side temp is 77 F (25 C ).
I set the temperature to be 73 F(23 C). The temperature shown in the thermostat in main floor is 76 F(24.5 C),
Main floor vent temp: 59 F(15 C),
2nd floor in master room vent temp: 62 F (17 C),
2nd floor in bathroom vent temp: 59 F (15C ).

I talked to my contractor and he said if the vent's temp is less then 64 F (18C), then the system is working fine.

Is this new AC system working normally? What's the right number should be? How could I deal with my contractor?
Very appreciate for your help?

[Shophound]

Short answer = there is no "right" temperature number to expect to emerge from your supply registers (vents). It will vary with indoor/outdoor temperature and humidity loads.

Having said that, there are given parameters one can expect from a properly designed and installed system. The factors are many and complex and with the info you've so far given, there's not a great deal more to be said.

Can you more closely define your discomfort? Air clammy? Reason I ask is that if the system is properly dehumidifying and removing sensible heat, you can be quite comfortable at 75 degrees inside.

[ct2]

are you looking for your vent temps to be closer to below 0?

your oat is 77 degrees? you should wait untill it gets a little warmer outside before you decide it is not working properly

a little more info would be great also, like where you are located, humidity, how many thousands of square ft are you trying to freeze?

[local 832s]

I agree with the above comments. The system can take a day to dehumidify the house. 4 hrs isn't to long to run as these systems are not meant to cycle on and off quickly. On a hot/humid day, that system may never shut off and that is ok.

[beenthere]

Is this the first time your using it.

If so, leave the stat set for 73, and see how it is doing tomorow.

If the house still isn't cooling down to 73, with OAT at 77, then call your contractor back.

Presuming the a/h is in the attic, you won't always get 20° delta at the registers.

Your getting 17° delta at the regs, and thats ok for an attic a/h.

[billva]

delta t should be taken at the inlet of the AH and the outlet.

is there alot of water draining from the condensate line?

you could be removing alot of latent instead of sensible heat, when the latent is removed it will (should) start to remove more sensible.

give it a few days.

good luck

[udarrell]

There are too many factors missing for us to give you a creditable opinion. You should get an accurate hygrometer - Percent Relative Humdity Gauge as we need to know the humidity level.

When the sun is not shining on the condenser, go outside and check the temperature of the air entering and leaving the condenser. Tell us what those temperatures are. You could ask the the contractor what the CFM airflow of the condenser is, --it would be helpful to us to know.

Knowing those factors I can give you an idea of how many Btu/hr of heat (both latent and sensible) your matched system is ejecting outside. udarrell

http://www.udarrell.com/air-conditioning-total-heat-enthalpy-latent-heat.html