Honeywell Mercury Thermostat Wiring

The t87f is adaptable to most 2 wire 24 to 30 volt heating systems and to most 3 wire 24 to 30 volt heating systems controlled by a series 10 thermostat. Variety of honeywell mercury thermostat wiring diagram. The new thermostat has connections for ob y rc r g w and a jumper between rc and r.

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In a mercury thermostat there is a small glass tube with a drop of mercury sealed inside.

Honeywell mercury thermostat wiring. If the wires want to pull back into the wall tape them down with masking tape to hold them in place. Loosen the terminal screws with a screwdriver and gently unhook the wires from the screws. I am replacing a 2 wire mercury thermostat with a honeywell digital programable rth2300b thermostat. New thermostats are safer for the planet and have less moving parts which makes them more reliablea perfect example of a common old thermostat is the honeywell t 87 also the white rodgers.

I have an oil burner with on demand heat. A wiring diagram is a kind of schematic which makes use of abstract photographic symbols to reveal all the affiliations of components in a system. It reveals the elements of the circuit as simplified shapes as well as the power as well as signal connections between the gadgets. Mounting thermostat to wallplate.

Never attach wires to both the b and o terminals. I have only two wires connected on the old thermastat black and red. I have tried red to r black to w with. Honeywell mercury thermostat wiring diagram whats wiring diagram.

Thermostat wiring details connections for nearly all types of honeywell room thermostats used to control residential heating or air conditioning systems. Use the wiring cross reference table below to match each old thermostat wire with its corresponding terminal on the ct87 wallplate or subbase. A wiring diagram is a streamlined conventional photographic depiction of an electric circuit. Two wires protrude into the tube at one end.

Ct87abj round thermostat 69 0274 6 6 wire the thermostat 1. This article gives a table showing the proper wire connections for honeywell brand wall or room thermostats used to control heating or air conditioning equipment. 8 through 13 wiring diagrams. Disconnect power supply before con necting wiring to prevent electrical shock or equipment damage.

The tube is held in place by a bimetallic coil that rotates the tube as the coil heats up or cools off.