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.
Tn2 vs Tn4

JL_2
Member Posts: 17
Does anyone know the difference between Tn2 402 and Tn4 422? Or just the Tn2 and Tn4 in general?
0
Comments
-
TN's
TN4 is an older bus, but supports both controller to controller interconnection as well as controller to thermostat. It requires 4 wires.
TN2 is new, and (so far) is only used for controller to thermostat connections. It requires only 2 wires. This can sometimes save a lot of work on retrofits.0
Categories
- 121.3K All Categories
- 84K THE MAIN WALL
- 2.9K A-C, Heat Pumps & Refrigeration
- 53 Biomass
- 417 Carbon Monoxide Awareness
- 40 Chimneys & Flues
- 1.7K Domestic Hot Water
- 4.7K Gas Heating
- 119 Geothermal
- 155 Indoor-Air Quality
- 3K Oil Heating
- 56 Pipe Deterioration
- 768 Plumbing
- 5.4K Radiant Heating
- 362 Solar
- 14K Strictly Steam
- 3K Thermostats and Controls
- 51 Water Quality
- 38 Industry Classes
- 73 Job Opportunities
- 17 Recall Announcements