honeywell mercury thermostat wiring

The tube is held in place by a bimetallic coil that rotates the tube as the coil heats up or cools off. This additional terminal is labeled ‘G’ in the thermostat.When the ‘fan on’ setting is selected, the contacts between ‘R’ and ‘G’ are closed turning on the relay that powers the blower motor directly regardless of a call for heating or cooling.If you are replacing an old thermostat with a new digital thermostat, the electronics in these units may need yet another wire for a terminal labeled ‘C’. 0000007731 00000 n This differs a schematic layout, where the plan of the parts’ affiliations on the layout typically does not correspond to the parts’ physical places in the ended up gadget. They usually operate at 24V ac power, and the source of this control power comes from a control transformer mounted either just outside, or inside the furnace body. By the use of an adjustable set-point, the job of the thermostat is to turn on either the heating or cooling system to maintain the desired room temperature in the home, and to turn off the system when the desired temperature is achieved. Be careful; this is line voltage and can seriously hurt or kill you. By the use of an adjustable set-point, the job of the thermostat is to turn on either the heating or cooling system to maintain the desired room temperature in the home, and to turn off the system when the desired temperature is achieved.The most basic of systems (such as an older ‘heat only’ forced air / gas furnace with a standing pilot light) only need two wires for control. endstream endobj 48 0 obj <>>>/Filter/Standard/O(��v$Q��ĵ ޺�/,֑z�ZY�@��7�f)/P -300/R 4/U(�0F��s�"X�{�9 )/V 4/EncryptMetadata false/StrF/StdCF/StmF/StdCF>> endobj 49 0 obj <> endobj 50 0 obj <> endobj 51 0 obj <>/Font<>/ProcSet[/PDF/Text]/Properties<>/ExtGState<>>> endobj 52 0 obj <> endobj 53 0 obj <> endobj 54 0 obj <> endobj 55 0 obj [/Separation/All/DeviceCMYK 78 0 R] endobj 56 0 obj <> endobj 57 0 obj <> endobj 58 0 obj <> endobj 59 0 obj <> endobj 60 0 obj <> endobj 61 0 obj <>stream In this article, I am going to explain the function and wiring of the most common home climate control thermostats. I have only two wires connected on the old thermastat (black and red). 0000001497 00000 n 0000018759 00000 n 0000044325 00000 n Some have the common (C) wire, while others do not. d. Inspect the old thermostat wiring.
If nothing happens, check the voltage to the thermostat. 47 0 obj <> endobj Hunker may earn compensation through affiliate links in this story. Two wires protrude into the tube at one end. Save your receipt and make sure you have the following parts: • Thermostat and mounting plate • Labels • Screws and anchors • Installation and Programming Instructions 2.Gather the needed tools and supplies listed below. Disconnect both ends of the wires from the transformer and check for continuity after turning the thermostat all the way to its highest temperature setting.

If input voltage exists but no output voltage, the problem is the transformer; replace that. 0000004898 00000 n 0000029571 00000 n

Align the thermostat over the wallplate and tighten the three captive mounting screws. This electricity powers a relay that turns on your furnace or air conditioner.

If it does come on, do the same test with the cooling circuit by connecting between the red and yellow wire. The mounting base has marks to align the thermostat on a level line drawn on the mounting surface.Remove the thermostat cover and look at the mercury bulb while turning the dial; the bulb should rotate as the dial is turned.
<<247577E9FB2FA84ABB8AD7CBF0DA874A>]>> Find out if your home is compatible with a Honeywell Home thermostat. The Honeywell mercury thermostat has been installed in homes and businesses for decades, though it is used less often since the digital programmable thermostat became popular. 0000018219 00000 n �O؅ǈ_T�r��F��;S�ٝ�?� �j��&��`�w��/Tt`�7��7��#Y�~��AcLGزa�� 6Hε��ԃ4��"�`��&��:��r��M+�c�^��T�v�\��K3nJ�&��j��h�W�H��lb�887�(�;B�P@6�! %PDF-1.3 %�� 0000014637 00000 n The obvious down side of this is that if the battery goes dead the thermostat will no longer function.Climate control systems have evolved a great deal in the last several years with the evolution of electronic control.

"If you're looking for a good reference to help you understand simple home wiring, I personally recommend 'The Basics of Household Wiring' DVD". You may need to unscrew the cover if it is locked on. Disconnect power supply before connecting wiring to prevent electrical shock or equipment damage.

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