It seems reasonable to assume that the low-pressure switch opens the circuit to the Compressor/Clutch when it senses low pressure in the system. So higher pressure must close it, making it a normally-open switch.
Nevin Hawlman
GardenGrapevine.com
A pressure switch can be normally open or normally closed. It depends on how it was made. The NO/NC should be marked somewhere on the switch. A pressure switch can be normally open or normally closed. It depends on how it was made. The NO/NC should be marked somewhere on the switch.
A normally closed switch is a switch that is normally closed. When you operate it, it opens.
Air con is an abbreviation for Air Conditioning, and a pressure switch is a device used to monitor the A.C. system for irregular pressures within the sealed system. There are low pressure and high pressure switches, usually normally closed, open on drop or open on rise respectively.
The 2004 Chevrolet Impala air conditioning pressure switch can be found on the end of the air conditioner compressor. The pressure switch should be labeled as such.
normally closed
The 1997 Pontiac Sunfire air conditioning low pressure switch can be found on the top of the air conditioning compressor. The low pressure switch will be labeled as the low pressure port.
The 1997 Toyota Avalon air conditioning low pressure switch can be found on the top of the air conditioning compressor. The low pressure switch will be labeled as the low pressure port.
In switch language, open means to disconnect, or break the circuit. Some people call this "turned off". Closed, is to connect, or make the circuit. Some people call this turned on. In the case of a normally open switch, the switch is open (off) unless something takes action on the switch. Pushes a button for example, or holds a magnet near the switch, or other active force. A normally closed switch is closed (on) unless some force causes the switch to be opened.
The pressure switch for the air conditioning system on a 1996 Ford Windstar is located in the accumulator. It triggers when the compressor will turn on and off.
this means having a low resistance measurement ; average 0.5 ohms, across 2 contacts of a switch which is normally a low value or short circuit when the switch is physically closed.
The 1997 Chevy Lumina 3.1 liter low pressure air conditioning cycling switch can be found on the air conditioning compressor. The switch will be on the top of the compressor.
The 1994 Pontiac Trans Am air conditioning low pressure switch is on top of the air conditioner compressor. The low pressure switch will be labeled as the low pressure port.