Take a wire from one of the line terminals L1 to one side of the contactor coil. Take another wire from the second line terminal L2 and put it to one side of a N.C. contact on the overload block. From the other side of the N.C. contact on the O/L block take a wire to the N.C. terminal on the pressure switch. From the other side of the N.C. contact on the pressure switch terminal connect the wire to the other side of the coil. This configuration will be using the same coil voltage on the contactor as that of the supply voltage.
When the neutral wire goes to the switch
If you have to ask here, you shouldn't be trying to wire in a 20A compressor. You will require a special circuit for the voltage and current with an independent breaker. Check your local code for the wire size or talk to a qualified electrician.
If you are adding the pull chain to an existing fixture then the pull chain switch should have two wires. Wire nut either one to the hot wire coming in and the other to the black wire of the fixture.
Wire is the transition material used to carry the electric current; the switch is the controller of that current.
the black wire is the hot wire
Maybe the compressor clutch is not being sent power from the switch in the cab. I'd yank the panel out and have a look at the switch. FriPilot
The low pressure switch is mounted near the ac compressor. It is a two wire switch mounted in the low side line.
Thats green and black wire is the switch wire for the compressor clutch. Trace the fault back to the relay. Bridge the relay out and see if the compressor comes in, if so its either the relay, switch or fuse. If not then its the feed to the relay.The system WILL have a fuse and a relay. Hope this helps.
Unplug it from the accumulator and run a jumper wire between the two holes. If the compressor clutch remains engaged while the jumper wire is in place, the switch is functioning properly.
it's near the accumilator. Jump the wire connector with a paperclip to activate the compressor.
Locate the low pressure cut out switch, unplug the wire connector, using a paper clip jump across the two connections in the electrical plug. This will by pass the low pressure switch and allow the AC compressor to run. THIS IS A TEMPORARY PROCEDURE! Once you have filled the system with freon remove the jumper wire and plug the connection back in to the low pressure switch.
easy first by pass it with a wire link next fix leak and recharge with r134a 800grms at suction pressure of 200kpa remove wire link and re connect on to Lp switch
check the cycling switch.
What kind of car and which switch. There are several that can effect compressor operation.
The positive wire on a 1984 Mercedes 380 SL for the AC compressor is the green wire. It provides power to run the compressor when the air conditioner is turned on by the driver.
It depends on the vehicle but most of the time you can jumper the low pressure switch....
there is a high pressure switch on the line or the accumalator, unplug it and place a jumper wire into the connector