Have a gas, forced hot water heating system.
Was about to order a Honeywell thermostat over the web, but had the
following concern which
just dawned on me.
Am interested in their digital model RTH 5100 which is non-programmable.
It says on their ad sheet that it maintains the set-point if there is a
O.K., that's great.
But even if there is house power--
These units require a battery or two.
What happens if the battery runs down while you are away ?
I know, use new, fresh, batteries, etc. But-
Will the furnace shut off if battery runs down ?
Or, is the battery only for the display, and the circuitry still works ? If
so, how, as there's no current when
the circuit is calling for no heat thru the 2 wires.
e.g., with no thermostat battery voltage, does the curcuitry default to a
circuit closed condition, which would
keep the furnace active, or... ?
A bit worried about this.