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I have a intertherm model 9007590 AC unit. The condensing unit was changed to a unit that has a common wire and a y terminal and the old condenser unit had three wires at condensing unit. I can't get it to run and I think some of the wiring has been changed. I need to know how the low voltage wiring is suppose to be and if I need a four wire or five wire stat due to the condenser being changed. What stat do you recommend for this unit. Thank you.

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  • thetim May 11, 2010

    ok red wire is 24volts goes to R,Yellow wire is the call for a/c goes to y, Blue is common that powers the t-stat. That is most of the time once in a while people change it up. How many and what color wires are at the a/c unit that are connected to the t-stat wire? Is it only a/c not a heat pump? was the disconnect ever pluged back in?

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The unit with3 wires was set up as a dual transformer the new unit is single transformer system. it needs to be rewired at thermostat,furnace,and ac

Posted on Aug 25, 2009

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FURNACE OR AC WONT TURN ON


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1 Answer

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"Y" terminal at the stat feeds condensing unit outside, common from the condensing unit to common on the furnace transformer.
"G" terminal on the stat brings the fan on for air circulation. In cooling mode "Y" terminal also brings the fan on. If this furnace was not A/C ready check the VA capacity of the transformer. Should be about 40VA. Make sure there is a fan relay to bring the fan on in the cooling mode.

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