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Thanks I appreciate your response.

Thanks for helping me get out of the box I only had two legs and a ground and needed your help to get the neutral. You and Occupant RJ I appreciate the help and the rest of you that took to time to get involved. Dave

OK I get it, 4 wire 240v and I can keep the 120v coil using 1 leg of 240v the neutral, and ground the system. all legit. I understand the pilot circuit. Two momentary switches, 1-NO, green: pulls the contactor in and it stays in until broken by the 1-NC, red: breaks the circuit contact drops...

Your looking at the top schematic, wired for 3Ph. scroll down to the single phase schem

Just for motor protection, otherwise the combo pressure switch on-off head unloader your talking about is just fine.

Hi Peter, These things are a little different than what I'm used to. Let me give you a short explanation. The contactor is designed as a three phase or single phase unit. To operate it as a single phase contactor they use the 2 legs of the 240v L1 arrives at T1, L2 arrives at T2 is looped...

I would venture that if you have a reset button on your motor and you use a 30amp double pole switch you would probably be OK. I would use a starter if the motor does not have a reset button.

Do you have a magnetic starter? They get complicated real quick.

Hi Guys, I’m new to the forum though I’ve been here a few times in the past. I'm wiring a single phase 240v compressor and could use a little help. I'm using the following components: 240v 1ph motor 3hp 240v furnas pressure switch 69ha1z Rockwell Allen Bradley magnetic contactor 509 bod wired...