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Thermostat Honeywell RTH8500D Owner's Manual. Read honest and unbiased product reviews from our users. Your thermostat is the control center for your HVAC system. Move system switch to HEAT position. Honeywell RTH8500D Review Posted on September 18, 2015 If you are looking for a thermostat with touchscreen function that doesn’t use batteries then you will most definitely come to love the Honeywell RTH8500D. Thermostats Take control of your home comfort and save on energy costs with a range of Honeywell Home thermostats. Touch screen programmable thermostat (64 pages) Thermostat Honeywell RTH8580WF User Manual. — fuse or circuit breaker. ... lockout and indicate a Fault 46 if a 3.0 second FFRT is used and jumper JR2 (Lockout… May be in OFF or COOL position. May be OFF. The Honeywell RM7890 is a microprocessor based integrated burner control for automatically fired gas, oil or combination fuel single-burner appli-cations. — system switch. 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