Wiring Diagram Old Round Honeywell Thermostat

At left the thermostat wiring diagram illustrates use of a honeywell t87f thermostat in a 2 wire application controlling a gas fired heating appliance. The blue brown or b lack wires also referred to as the c wire this wire connects the low side of the output of the low voltage power to the t stat. At left the thermostat wiring diagram illustrates use of a honeywell t87f thermostat in a 3 wire application as a spdt single pole double throw switch such as used to control low voltage motors electric radiator valves zone valves.

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I am trying to rewire a 5 wire honeywell thermostat.

Wiring diagram old round honeywell thermostat. Pamela a handy woman from brockton massachusetts. 8 through 13 wiring diagrams. Honeywell thermostat rthb wiring diagram. This is a round thermostat with a dial on it.

In the honeywell t87f thermostat series the single pole double throw switch makes closes one set of contacts when the temperature falls to turn on the heating appliance. Use the wiring cross reference table below to match each old thermostat wire with its corresponding terminal on the ct87 wallplate or subbase. Use the wiring cross reference table below to match each old thermostat wire with its corresponding terminal on the ct87 wallplate or subbase. Honeywell thermostat wiring diagram wires.

You ll probably see a thermostat jumper wire connecting the rc and rh terminals. 2 stage heat pump thermostat wiring rheem. T6 pro wiring diagrams. A look at a iconic bit of equipment the classic honeywell round thermostat.

4 wire honeywell thermostat wiring diagram a pcb layout is the resulting design from taking a schematic once specific components and determining how they will physically be laid out upon a. Ct87a b j roundﬁ thermostat 69 0274 6 6 wire the thermostat 1. This electrical wiring question came from. Gas or oil furnace.

Never attach wires to both the b and o terminals. It s there so you can supply power to the heating and cooling switches with a single wire which is usually red. Label wires and remove your old thermostat see pages. How is a honeywell thermostat wired.

Wiring cross reference connect to connect to connect to wire label ct87a. The thermostat makes a contact on both a rise and on a fall of room temperature. The wiring for your honeywell thermostat depends on the functions of your heating and cooling system. If labels do not match letters on the thermostat check the chart at.

Install and. Wire the thermostat ct87a b j round thermostat wire the thermostat 1. 8 13 for wiring diagrams. The wires are blue green white orange and red.

Install the honeywell lyric thermostat like a pro. The red wire the red wire r rc rh connects the high side of the output of the control transformer to the t stat. Note that in our case we had to use the green wire for c as discussed below because there were only four wires coming from.