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Re: How do I set this unit to cool?
The evaporator is mounted above and on top of the heater unit inside the box. It sounds like this cleaning is the issue if cool air is coming out. Very slow though, right? Good luck and keep me posted please. - Ned
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if you have it set at 60 F and it is working at 65 to 68 F then that would be about right
as the air is cooled the cold air falls to the floor and out under the door, open window or anywhere else it can escape
the unit has to be at 80% room height so if it is set in a window then when the cold air gets up to the thermostat or ac level in the window then it will stop cooling
So if the ac unit is say 4ft from the floor and the ceiling height is 8 ft then the ac will only cool the bottom 4 ft
cold air does not rise but falls down
if you are using a ceiling fan then the cold air is stirred up and the 65F sounds about right
remember that the setting temp ( what you set it at) is the lowest temp that it will go down to before it stops cooling and if that is not reached it will keep working to attain that temp and if the room is too big, air leaks under door . around the fit in the window , no insulated walls , hot exterior wall,etc then maybe 65 F is the best you will get
THE FACT THAT YOU CANT CHANGE THE SET COOL POINT ON THE UNIT BELOW 64 IS A SYMPTOM OF A DAMAGED CONTROL BOARD (SENTRY III), NOW THE UNIT CONTINUING TO COOL DOWN BELOW THE SET COOL POINT OF 64 AND GOING ALL THE WAY DOWN TO 55 IS MOST LIKELY THE RELAY.
I HAVE FIXED THIS EXACT SAME ISSUE BY REPLACING THE CONTROL BOARD AND RELAY ON THE UNIT.
At what temperature is the thermostat?
The temperature should never be lower than 70?F (21?C) for the unit to operate properly. If your temperature setting is above 70?F, then your unit might have a problem with the temperature sensor that controls the "on/off" cycle on your unit. For that you will need a professional certified HVAC tech to inspect it.
Most people think that lowering the temperature to the minimum will cool the room faster, but that is not the case. Since HVAC units move the air at a specific rate, it can only transfer the temperature, thus cooling/heating the air, within those parameters. That's what the calculation for the BTU is for. Normally cooling/heating the room to the desired temperature should take about 1 hour, but some new inverter units can do it in only 30 minutes or so. Lowering the temperature constantly or even keeping it at the lowest setting may cause premature failure of the unit.
Lowering the temperature setting doesn't change the temperature of the air coming out of the unit it just lets it run until the room temperature gets colder. Check the temp of the air coming out of the unit. If it isn't as cold as it used to be the charge could be low. First though you should make sure the filters are clean and the coils.You should also check the actual room temp. It's also possible the unit doesn't have enough capacity to keep up with the cooling load of the room.
That depends on the ambient temperature in the room..if your room is fairly warm you can expect it to take longer then if the room is cool...
I would say though that 1/2 hour is pretty normal...it is good to get the unit cooled down, the less time it is warm the longer it will last... heat kills ovens...even though they are made to take heat...
Make sure your vent is closed. check the filter to see if its clean. If you run the a/c you can check your evaporator to see if you have condensation or does it freeze up?
Make sure you have your unit on early in the morning. If you turn it on in the afternoon the humidity might be too much and it will take along time to cool down.
Try those things if that doesnt work then you need a service call.
I know it has been at least a year since your post. I am answering the post to terminate FixYa site activity on the post.
Remove the front cover. Check the routing of the temp sensor wire. It should go from the bottom of the control panel to the plastic clip in the evaporator coils. If it is touching the eavporator coils it will sense the refrigerant temp and cycle off early. If the unit is freezing up there is a restriction in the coolant lines and usually will require the coolant system be purged of foreign internal debris.