not cooling at the end of day - http://www.hvacmechanic.com/ Forums

Original message

jtitan24

66.119.33.135

"not cooling at the end of day" , posted Thu 26 Aug 14:31

office building; cools fine until the end of the day, during the hottest part of day, not cooling enough for comfort in side.
what would cause this and how do we fix it. thanks
jason

jason brumfield
thnaks for the help

Replies:

Freezone12

4.131.66.176

"Re(1):not cooling at the end of day" , posted Wed 17 Nov 06:38

Some systems have a double or even triple row of condenser coils that get clogged up with debris that is not visible from outside the unit.

If I suspect that it may be the problem I will pop the top of the unit loose near the condenser fan and peak down between the coils. It's amazing how much trash can get in between these style of coils, and washing them from the outside rarely gets this stuff out. The best way is to remove the top and split the coils apart, and hose them off. I know it sounds painful, but it's a money maker.

An easy indicater of this problem is hi head/hi liquid temp, and air flow from the condenser fan scooting across the top of the unit instead of up and away from the fan.

I live in Dallas, TX., and see this problem every year.

______________________________________________________________

If it don't fit force it.

If it breaks it needed to be replaced anyways.

Xenos
Webmaster

64.230.162.197

"Re(1):not cooling at the end of day" , posted Thu 26 Aug 22:50

Your largest heat load in a building normally occurs after 3PM there for it’s a capacity issue. Make sure the equipment is clean and running efficiently.

Xenos.

The best way to escape a problem is to solve it.

matt2d

24.207.158.176

"Re(1):not cooling at the end of day" , posted Thu 26 Aug 21:11

Check the easy stuff first, dirty filter and dirty condenser coil (the visible coil on the outside unit). After that, depending on the type of controls you use, it could be as simple as a programing problem in the control. Check to make sure the time and day are set right on a programmable stat and that your settings for unoccupied mode start time and temp are where you want them. Beyond these easy things call a service company and have them check freon and system operation.

Gary Lloyd

216.234.101.23

"Re(2):not cooling at the end of day" , posted Tue 7 Dec 14:34

What are the following?

Condenser air in temp
Condenser air out temp
Saturated condensing temp (from P/T chart)
Liquid line temp near condenser
Liquid line temp near metering device

Evaporator air in temp
Evaporator air out temp
Saturated suction temp (from P/T chart)
Suction line temp near evaporator
Suction line temp near compressor

________________________

Gary R. Lloyd CMS
HVACR Troubleshooting Books/Software
https://www.merchantamerica.com/tmethod/