Readers ask: What Is Blue Wire On Thermostat For Greenhouse?

What is the blue wire on a thermostat for?

Blue wires are also called “C” wires because they are the Common wire. C wires are necessary for any “smart” thermostat that needs to be connected to a power source 24/7, regardless of your heat pump type. Blue wires are for heat pumps, like orange wires. This wire connects to terminal B on your thermostat.

Where does the blue wire go on a 4 wire thermostat?

4 Wire Thermostat Wiring (Heat Pumps, HVAC)

  • Red wire for power (24V).
  • White wire for heating (connected to W or W1 terminal).
  • Green wire for fans.
  • Blue or yellow wire for cooling (connected to Y).

Is blue wire common for thermostat?

The Rh wire connects to the heating system. This wire may be red without an “H” attached, in some cases. Blue. The blue wire on the thermostat is the Common or “C” wire.

What does the blue wire mean?

Blue wires are used as travelers, usually on three- or four-way switches (controlling a light from multiple locations) or as switch legs for things such as fans or lights. Yellow wires are almost always used as switch legs for outlets, fans, or lights.

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What happens if you wire a thermostat wrong?

Potential consequences of improper installation could include: Electric shock. Blowing a circuit breaker. Damaging the thermostat unit, the electrical system or even the AC/furnace unit itself.

Where does the blue wire go?

Blue wire is for the light, if light is included with the fan. White wire is neutral. Green wire is for the ground.

Where does blue wire go on nest?

A brown wire is mostly likely a heat pump wire and should be connected to the O/B connector on the Nest thermostat. If the B wire is blue, it should most likely be connected to the C connector.

Where should I put my exhaust fan in my greenhouse?

Ideally, exhaust fans should be placed towards the roof of the greenhouse, opposite the door. If your particular greenhouse does not allow you to add exhaust fans, be sure to add extra circulation fans. Depending on your particular model, you may already have base or roof vents in your greenhouse.

Where should a greenhouse fan be placed?

The fans should be located near the center of the air mass to which they are adding energy. For greenhouses with floor or bench crops, a location 7′ or 8′ above the floor is good. In many greenhouses there is a truss or collar tie that can be used for support.

How does a greenhouse exhaust fan work?

Exhaust fans create the pressure difference and cause air to flow. Fresh air comes through shutters placed at the opposite end, and the fans work to distribute it evenly throughout. As the air travels through the greenhouse is absorbs heat and is warmed gradually.

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What if there is no C-wire for thermostat?

If your current thermostat didn’t need a C-wire, it (or a wire that can be used as a C-wire) might be rolled up inside the wall. This is more likely to be true if you see all the other color wires present. Line voltage thermsotat scenario: you have just two wires (white and red, probably), and they’re thick.

What color is the common wire?

The White is often referred to as Common, but the colored wires are also used as hot wires.

What wires are for heat on a thermostat?

Some of the other wires powering your thermostat include:

  • R-wire – Power, usually red.
  • G-wire – Fan, usually green.
  • Y-wire – Cooling, usually yellow.
  • W-wire – Heat, usually white.

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