american standard and a new thermostat

[davizona]

Hello,
I have an American Standard(WCH036B100BA) that is wired to a White-Rodgers(1F86-444) thermostat. We've noticed that in the past few weeks the unit will continue to run(cool/ac) up to 5 minutes or more after hitting the setpoint on the display. I saw this paragraph in the White-Rodgers manual
Cooling System
This thermostat has a built-in short-term (5-minute) time delay.
This feature is activated after the compressor shuts down and
the setpoint is changed within the 5-minute period. During this
5-minute period, COOL will flash on the display indicating that
the thermostat has locked out the compressor to allow head
pressure to stabilize. This thermostat does not sense AC power
loss and therefore does not activate the short term compressor
protection feature when power is restored.
This paragraph is somewhat confusing to me though.
My first guess was the thermostat needed replaced because the unit was not doing this last summer. I bought a Honeywell(RTHL3550D) thermostat, and was in the process of figuring out the transition between the wiring terminals when I looked at the computer and suddenly realized that I have this wonderful thing called the internet, and that there might actually be someone out there that knows more than I do(at least about home ac units):whistle:
Any thoughts or suggestions?

[TwincamDave]

That 5 min. delay is for start up if the unit was running in the last so many minutes so the compressor can start like it should(it can't start with high pressures and they need to equalize). Does your stat have humidity control built in it? if so it can run past set point by up to 3 degrees if set that way.Typically the newer units have a purge on shut down to expell all the"cooling" that was produced in the coil while it was running.

[davizona]

No humidity control, and I appreciate the quick reply.
I installed the new stat, I see something that perhaps wasnt so obvious on the old stat. Cooling lcd indicator turned off after 3 minutes, then the fan ran for another minute or two perhaps for that equalization period.
Thank you.