Question about Heating & Cooling
Have a Liebert unit for a data center that is tripping on high head. Coils are clean. Suction and Liquid readings are good, and it will run until we hit cold weather (Logs show it usually happens on a cold night) ... Tested electrical and everything is good there as well. Thinking it may be a problem masking an even bigger problem...
Two things come to mind, either it's icing and liquid coolant is causing spikes when it reaches the hot compressor, which would point to low gas or the need of a pre-heater. The second would be icing allowing the oil to get overcooled and it starts to gel at the head, same solution for both.
A more distant third would be moisture in the system, the trap could need replacing if it's been serviced a decent amount.
Posted on Apr 01, 2014
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Posted on Jan 02, 2017
I have seen this is many digital thermostats. The worst problems usually come from the touchscreen thermostats. I would suggest installing a new thermostat. Make sure that you read the instructions before you even remove the old one.
Posted on Jul 03, 2008
No, the units are sealed and the rain should not have affected the system at all. I would remove the outer cover of the unit and access the capacitors. Your start capacitor may be bad. You can visually inspect this and tell if there is a problem. Small black relay on top of capacitor often burns out, if so, replace capacitor and relay. If this looks fine, then we need to start at the thermostat and work our way forward.
Posted on Jul 05, 2009
SOURCE: AC not cooling during the day
Your AC cooling efficiency is low when he ambient temperature is high and naturally it cools well when the outside temperature drops.
Please remove the filter on the grill and try to clean it under the tap water and after removing all the dust fix it back to the unit. This would increase the cooling efficiency of the unit.
Your AC is also five years old. Please avoid frequent opening of doors or windows.
Ensure that the exhaust fan and the blower of your unit are functioning normal.
The technician might not have done a proper job in fixing the area where the refrigerant would have leaked out. Please check the refrigerant pressure to ensure that no further refrigerant leak has taken place. Or even servicing your unit he would have punchered the tubes resulting in very slow leak of refrigerant resulting in no cooling or less cooling. It takes around a month to feel the pinch of it and the refrigerant. One fine morning after sometime the unit will run and it would start throwing hot air instead of cool breeze!
Posted on Jul 13, 2009
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