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A set of normally closed contacts (N.C. 2from SK relay was already. wired to break power to control board.) Originally I wired the other set of N.C. Contacts as well. Tested operations. I also tested secondary drain safety switch and pan safeties as well. System operating well at this time. Ultimately Computer Force and I decided to leave relay wired as I was with 1 set of N.C. Contacts wired to break 24VAC. After testing and confirming that air handler shuts down.