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18 gauge wire for line voltage t-stat????
Had a serviceman come out to my mother's house to replace the non-functioning honeywell T8090A_T8191A chronotherm t-stat, which was 24vac as far as i know. Existing wire was 18 gauge (honeywell t-stat cable 18). They installed a Honeywell T451A3005, which requires 12 or 14 gauge. The 18 gauge, far as i know ran down to the basement where it joined the other t-stat low voltage line at a step-up transformer at a junction box. T-stats are hooked up to a .18amp taco relay which runs the circulators off a logamatic 2107 with outdoor reset.
I don't believe the tech ran new wire to the basement, so i can only guess he used the 18 gauge wire which i assume to be not code for a 120vac system. The company apparently only uses these commercial t-stats, which are much less sensitive than the low voltage. The new 3000 series is apparently a step up from older models in differential temp swing, and since this is a rear porch which does not need programmable, that's not the problem. It's the wiring I'm concerned about. Or perhaps I'm missing something. Any thoughts appreciated.