I've also determined that Checker has 3 different low pressure switches, all of which appear to fit into the back of the compressor and fit the plug that was removed from there, and has LT GRN & DK GRN/WHT wire. I have two conflicting diagrams with regards to the High and Low pressure switches.
However, I'm going to go ahead and just replace all the switches.īased on two wiring schematics I have, I can confirm the cycling switch is in fact on the accumulator. I removed the jumper on the cycling switch, nothing.so the cycling switch is bad. When the switch is screwed on, it opens the valve and that's how the switch works. Oh, and those that are talking about replacing a switch without evacutating are referring to switches that are mounted on the accumulator or lines, as a lot of them use a schrader valve so that the switch can easily be swapped out without removing the refrigerant.
#COMPRESSOR CUT OFF SWITCH INSTALL#
To install a switch now, you will have to evacuate the system, install the switch and than recharge it.īy the way, my online database is showing that the 97's high pressure cut out switch is located on the compressor and the low pressure switch is on the accumulator. I know plenty of people who have made your mistake and just left the switch out and used a jumper between the old connector. The high pressure switch is just a safety device and normally is never needed, however, if your fan stops working or isn't pulling enough CFM's through the condensor, than the system can over pressure and cause damage to the compressor. They are held in place by a snap ring, but when you buy a new compressor, they come with a plug installed and you have to either install the old switch, buy a new one, or leave that plug in place as the compressors had universal applications and do not always need the switch.
Most of the time, it was just a high pressure switch, which is a closed switch unless the pressure in the system goes above a set point where it opens the circuit and causes the compressor's clutch to disengage. On the older compressors, some did have a switch in the backside (sometimes 2).