Heat Exchangers
Furnace Heat Exchanger issues affecting low temperature of the air?
I heard that there is a minimum temperature at you should have your home in winter to protect the heat exchanger on a furnace with high efficiency. I heard stories people who go on vacation and leaving their temperature thermostat set at 45 degrees or something and it hurts the heat exchanger. Is true and if so, what is the recommended minimum temperature I should set my thermostat?
I have installed and maintained numerous 90 + ovens. It clearly indicates in the book of installation, you must have a temperature min air return of not less than 60 degrees for continuous operation and 55 degrees for intermittent. Also, you do not want the return air to more than 80 degrees. If the return air is too cold in an oven at 90 + Air combustion condensate is not where its supposed to do, namely the heat exchanger unprotected first, not only in the second, doubled heat exchanger. Which rots the first heat exchanger. I would not put my stat below 60 just to be sure.
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