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Contactor does not activate on 1 ton 208 V 1PH residential Heat Pump condenser. It cools and heats when manually pushed in. A green flash comes from the contactor when pushed in a and released

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Green flash is the sparking, which is common which elderly contactors. It should likely be replaced. Test for the problem by checking for continuity (ohms) on the solenoid coil of the contactor. (The two small wires on the side.) Test also if you get 24v AC on those two wires when the A/C is turned on. If you have no 24v, it's a thermostat or wire problem. If no continuity, replace the contactor. (Always pull the wires off the contacts when checking the contacts for continuity.)

Posted on Nov 11, 2010

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Posted on Jan 02, 2017

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1) Copy following link for wiring illustration ... assuming timer is supposed to control pool pump:
http://waterheatertimer.org/images/T104-to-contactor.jpg

2) T104P is 240Volt (208-277V) SPDT timer in P plastic outdoor enclosure.
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html#T104

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http://www.bestbuypoolsupply.com/media/aemanual.pdf

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If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

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The contactor for the compressor and outdoor fan is activated by your thermostat when you call for cool. The small coil is an electromagnet that gets 24VAC when you call for cool at the t stat. The red wire in your T stat connects to the blue (or sometimes yellow wire) in the t stat completing the 24VAC circuit and closing the contactor. The line voltage is supplied to the poutdoor fan and compressor upon the contactor closing.

You can manually pushthe contactor close and the outdoor fan and compressor should start. Do this with your hand on the insulated portion of a screwdriver and take the tip of the screwdriver and push the contactor closed. The compressor and outdoor fan should start. That tells you that you have a thermostat to contactor coil issue if the t stat does not close the contactor when you call for cool.

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1 Answer

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Hi, if this is just a split standard heating and cooling unit, and not a split heat pump, all you need to do is pull stat wire from the indoor unit control board to control the condenser with 5 conductors, but you will only use 2 wires for the control of the condenser. Normally, the red and white tie to the 2 control wires of the contactor. Back at the control board, red to red and white to the Y or yellow terminal. You will also need to set your disconnect box for your high voltage near the condenser, where you will be coming from your breaker to supply high voltage to run the motors and compressor. Very easy to do. If it is a heat-pump, you will need to pull at least 8 conductor thermostat wire to wire this up. I would also need to know what terminals and kind of thermostat you have, and if you are using heat strips for second stage of heat. When you say standard unit, you will only need 2 control wires from the indoor to the outdoor unit, along with the high voltage. Please keep me posted and let me know if you need more help on this. A wiring schematic wouldn't be needed if its just a standard condenser.
Sincerely,
Shastalaker7
A/C, & Heating Contractor

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2 Answers

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