Old Mercury Thermostat Wiring

To work accurately a mercury thermostat must be mounted vertically and level. A wiring diagram is a streamlined conventional photographic depiction of an electric circuit. 8 through 13 wiring diagrams.

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Variety of honeywell mercury thermostat wiring diagram.

Old mercury thermostat wiring. Fuse box or switch at the furnace air handler. I have an oil burner with on demand heat. I recently replaced my old white rodgers mercury thermostat with a programmable lux model tx9600ts but not before i had a moment of panic all the instructions and how to videos say to note what wire is connected to what lettered connection point. How to replace a mercury thermostat.

I have only two wires connected on the old thermastat black and red. It reveals the elements of the circuit as simplified shapes as well as the power as well as signal connections between the gadgets. Replacing mercury thermostat with a digital thermostat install wiring white rogers. Never attach wires to both the b and o terminals.

They re there and i ll tell you how to find them. 5 remove the thermostat s mounting plate screws and take it off. Use the wiring cross reference table below to match each old thermostat wire with its corresponding terminal on the ct87 wallplate or subbase. Turn the thermostat to the off position.

Replace old thermostat install. Upgrade from mercury to digital thermostat david jones. This switch must be moved manually at the start of the heating or cooling season. The mounting base has marks to align the thermostat on a level line drawn on the mounting.

Reliable a perfect example of a common old thermostat is the. You out when connecting the wiring on the new thermostat. Don t panic if you can t find the letters on your old mercury thermostat. Upgrade from mercury to digital thermostat duration.

Ct87a b j roundﬁ thermostat 69 0274 6 6 wire the thermostat 1. Remove the existing thermostat but leave the wall plate in place for now so you can note how the wires are connected. I am replacing a 2 wire mercury thermostat with a honeywell digital programable rth2300b thermostat. The thermostat has a switch to select operation as either a heating or cooling thermostat.

The new thermostat has connections for o b y rc r g w and a jumper between rc and r. Follow these steps to replace your old thermostat. Put the old thermostat in a safe place so that you can recycle it properly as most old thermostats contain glass tubes with mercury.