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The tube is held in place by a bimetallic coil that rotates the tube as the coil heats up or cools off. 0000007813 00000 n 0000002238 00000 n Ł Wiring labels 2.
0000012589 00000 n In this article, I am going to explain the function and wiring of the most common home climate control thermostats.
They connect to a two-wire thermostat (generally a mechanical thermostat with a mercury filled ball connected to a coiled bi-metal strip).A basic two-wire thermostat can be compared to a simple single-pole switch that you will find throughout your home, only instead of you turning the switch on and off as required, a mechanical or electronic temperature controlled mechanism is the operator of the switch.The terminals are usually marked ‘R’ and ‘W’. I found all of that in this DVD, and I am confident that you will be impressed with the quality of the information contained in this excellent resource.This easy to understand tutorial (and no – you won’t need to understand technical “jargon”) breaks down the majority of home wiring projects you’ll encounter around the house and provides detailed, step-by-step instructions on how to complete them – The latest in my series of ‘Internet Electrician’ E-Books covers the use of a digital multi meter.This is one of those ‘tried and true’ tools of the trade that electricians can’t imagine doing their job without.
Turn off power to the heating/co oling system at the main fuse/circuit breaker panel. They just get a little more sophisticated so if you are pre-wiring a new home, check with the contractor providing the HVAC system as to what thermostat wiring is required. Some have the common (C) wire, while others do not. If it does come on, do the same test with the cooling circuit by connecting between the red and yellow wire. If both circuits work when the thermostat is bypassed, the thermostat has failed and needs to be replaced. This has made the units more efficient, with added safety features, and with this comes increased difficulty for the average home-owner to repair or replace any parts of the system that may break down (and they will, but only when you really need it! Remove and discard the plastic insert protecting the mer- cury switch. Two wires protrude into the tube at one end. 0000012777 00000 n Some programmable thermostats (e.g. 0000000016 00000 n Thanks for taking the time to read it! 0000001997 00000 n
Prepare for Installation 1.Carefully unpack your new thermostat. 0000004708 00000 n When the tube rotates enough, the drop of mercury makes contact between the two wire contacts, allowing electricity to flow between them. )However, the terminals of the thermostats of today are still labeled the same, and provide the same functions as what we have discussed thus far.
Remove the wires from the contact screws and check for continuity across the contact screws. Pictorial representations are commonly images with tags or highly-detailed illustrations of the physical elements.If a line touching another line has a black dot, it means the lines are linked.
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The thermostat is the control device that provides a simple user interface with the internal workings of your homes climate control system.
7u6���u���6&~s��sx��|�f�W�퓮}Հ̤-�M���c�- ��Ϲ������M��s���9��t$;�� If nothing happens, check the voltage to the thermostat. Troubleshooting a mercury thermostat is quite easy due to the simplicity of the unit and its limited function.A thermostat is a temperature-controlled switch. 0000011843 00000 n
%PDF-1.3 %���� It reveals the elements of the circuit as simplified shapes, as well as the power as well as signal connections between the gadgets.A wiring diagram normally offers info concerning the relative position and also plan of gadgets and also terminals on the devices, to assist in structure or servicing the gadget. WIRING All wiring must comply with local electrical codes and ordinances. �ۋ��>��}�����O�F�n�Q�H�b�ʰ� ^H�lkoMG�.�-����K�����m*GP�=� �T�[�s�4����ZE=�t�z��E�s��OG��Ȑ�s6���6{�C�StJC�{���9����rz6���D2�I�y�2��ri��%��BM��4-��[�fqw��������AD����D�4;5Ue�`��&H&�JJ
d. Inspect the old thermostat wiring. 47 42
In a mercury thermostat there is a small glass tube with a drop of mercury sealed inside.
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1), ... but do not disconnect the wires. I have only two wires connected on the old thermastat (black and red). 0000058972 00000 n
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.
!m� >�@u"����{C���L�(�TC++��� In a mercury thermostat there is a small glass tube with a drop of mercury sealed inside. This test bypasses the thermostat, sending power directly to the furnace or air conditioner. Align the thermostat over the wallplate and tighten the three captive mounting screws. Gather these tools: Remove the old thermostat 1. ... 69-1631—1 2 MERCURY NOTICEIf you are removing an old thermostat that contains mercury in a sealed tube (Fig. This switch must be moved manually at the start of the heating or cooling season.. To work accurately, a mercury thermostat must be mounted vertically and level.
If the transformer is functioning properly, check the low-voltage wires to the thermostat. 3.Make sure that your heating and cooling systems are working properly. They are additionally useful for making fixings.DIY enthusiasts utilize wiring representations but they are additionally usual in house structure and vehicle fixing.For instance, a residence building contractor will certainly wish to confirm the physical location of electric outlets as well as light components using a wiring diagram to prevent costly mistakes and building code infractions.A schematic reveals the strategy and function for an electrical circuit, but is not worried with the physical design of the cables. Remove the cover of your old thermostat. 0000014637 00000 n It must be professional, it must be technically correct, and above all, it must focus on safety. 0000005092 00000 n
#���Z��N�|�J! 1). The tube is held in place by a bimetallic coil that rotates the tube as the coil heats up or cools off.