Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.
T-T Switch & End Switch

tivo
Member Posts: 16
What are T-T switch & end switch? I googled them but couldn't find much good resources. Thanks!!
0
Comments
-
T T is not a switch
it is the designation for the terminals on a relay that the thermostat typically is connected to. The thermostat becomes the switch. Connected to the T T terminals in the relay are a transformer in series with an electromagnet. So the transformer secondary (24 volts) is the source, the electromagnet is the load and the thermostat tied to T T is the switch.
An end switch is found usually on zone controls it is typically a normally open switch until and operating force is applied. The operating force would be a call for heat from a thermostat which is connected to a let us say a Zone Valve. The valve motor is powered and then as it opens to allow the flow of water through the end switch makes and could also be tied into that T T terminal on a relay which in turn will bring on a circulator and also power an oil burner or gas valve depending on which system you have.0 -
T-T Terminal & End Switch
Thanks for the detailed explanations. Thanks again, Tim!!0
This discussion has been closed.
Categories
- All Categories
- 84.3K THE MAIN WALL
- 2.9K A-C, Heat Pumps & Refrigeration
- 53 Biomass
- 417 Carbon Monoxide Awareness
- 44 Chimneys & Flues
- 1.8K Domestic Hot Water
- 4.8K Gas Heating
- 120 Geothermal
- 156 Indoor-Air Quality
- 3K Oil Heating
- 57 Pipe Deterioration
- 794 Plumbing
- 5.4K Radiant Heating
- 370 Solar
- 14.1K Strictly Steam
- 3.1K Thermostats and Controls
- 54 Water Quality
- 39 Industry Classes
- 80 Job Opportunities
- 22 Recall Announcements