SERVICE DEPARTMENT - AIR CONDITIONING
High Pressure Safety High Pressure control reset Scotty McGregor HVAC Oracle   2005-07-03   Symptom: No Cooling, Indoor Fan Runs, Compressor Does not start Caused By:High Pressure Safety Control Tripped-Reset required Encapuslated High Pressure Contrl Not all AC units have high pressure protection. Most smaller residential units do not. This device protects the compressor if the condenser fan motor quits or the coil becomes plugged. The reset buttom is external on some units. Look for a small red button protruding from the side of the condensing unit casing. It may be located behind the compressor access panel. It is not normally locate in the eletrical control area, but some are. Make sure the power is off before removing any panel. Look for a control simaler to the pictures shown. If there is a high pressure control it pressure sensing line will be located on the discharge line off the compressor or on the liquid line from the condenser. The reset button can be mounted directly on the line, or it may be connected via a capillary tube into the control panel. This is reset switch will hold the compressor off until it is reset. After it is reset the compressor may or may no start right away, but you should feel or hear a click when it is reset. After the compressor does start,locate the cause of the high pressure or it will just tripped of again. Repeated high pressure failure will burn out the compressor. Check the condenser coil, make sure it is clean, the condenser coil should be clean regularly. Check the condenser fan motor. If the motor is load or noisy then the bearings maybe worn out, the can cuase the condenser fan to shut down on an internal over load and then cause the high pressure control to trip off. Check fan blade or mountings, are they tight and the blade can rotate freely? Sometimes a high pressure failure happens when the system is overcharge with refrigerant. It will run OK warm days and trip off on really hot days when you need it the most. Do not attemp to remove the high pressure control, this may cause the release of the refrigerant gas.	Air Conditioning Tips Preventive Maintenance for portable or window air conditioners Dirty condenser coils Freezing evaporator High Pressure Control Tripped Keep your AC going in on the hottest day of the year. Residential AC wiring Diagram INSPECTION FORMS CENTRAL AC ECONOMIZERS ROOFTOP AC CHILLERS PORTABLE SERVICE TIPS Live Technical Support Need to talk to tech. Click here and complete payment to get live help How to buy an Air Conditioner I am often asked, " What brand of air conditioning would you recommend" Split AC Inspection. Level one inspection Check list for spring AC Start AC Wire Diagram Typical 4 wire diagram for a residential furnace/AC thermostat Spring PM of Window/Portable unit What maintenance is needed for portable or window ac units Over Heated Wiring Regularly inspect the wiring connections in AC equipment High Pressure Safety Tripped If your AC over heats it may shut down on high pressure Frozen Evaporator What causes the evaporator to freeze? PM for Residential AC Basic maintenace for your home AC Dirty Condenser Coil Annual cleaning of the condenser coil.
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