4 Wire Thermostat Wiring Color Code

If you’ve installed more than a few thermostats (t-stats), you likely noticed that many of them use four wires.  See this shown below in the units we’ve wired.  Typical 4 wire thermostat wiring color code examples follow. 4 Wire Thermostat Wiring Color Code In the setups we’ve seen, the most common wire color code guide … Continue reading 4 Wire Thermostat Wiring Color Code





Honeywell Thermostat 4 Wire Wiring Diagram

Today’s thermostats have so many new functions. So there are many more wires to connect up when installing a new or replacement t-stat. Gone are the two-wire days.  In those times, all you needed was one wire from the furnace transformer.  Plus, you had another to feed power to a gas valve or relay to … Continue reading Honeywell Thermostat 4 Wire Wiring Diagram





How to Wire a Honeywell Thermostat with 4 Wires

If you’ve installed more than a few thermostats, you’re likely to have come across many that utilize four wires, as shown below in the units we’ve hooked up.  Typical 4 wire thermostat (t-stat) wiring examples follow.  Some have the common (C) wire, while others do not.  Both examples of how to wire a Honeywell thermostat with 4 wires … Continue reading How to Wire a Honeywell Thermostat with 4 Wires





Robertshaw 9415 Thermostat Review

We’ve owned the  Robertshaw 9415 Non Programmable Digital Thermostat  since 2004.  We replaced it in 2013, not due to failure of the unit or any dissatisfaction with it. But rather, because we upgraded to a programmable thermostat. At a cost of approximately $55 from various Internet sellers, this seemed a slightly high price for a … Continue reading Robertshaw 9415 Thermostat Review