Hvac Thermostat Wiring

ground - green / neutral - white / orange -?? / Ect.

First, you must under a low voltage thermostat, works at 24Volt and 18-20 milli-amps.

Green is a land that is marked as X or G. White is the neutral of the main power source leg (phase B). Orange and Brown is for heat pump systems. Red is the hottest part of the main power source leg (Phase A). The yolk is the part of the function of heat from the thermostat. White is the cooling function side of the thermostat. Blue is never used except in hospitals because programmable thermostats, he is the head of the memory function. Some thermostats, and in particular, business units with older model outdoor temperature sensors leads the air duct of the unit will have an extra Red and Black an extra wire.

For further questions email me at ELT2YRAAS@yahoo.com My name is Mike.
I am an HVAC and refrigeration, electricity and sanitation.

Assembler technician

MECP (Mobile Electronics Certified Professional) and ASE (Automotive Electrical Service)

Technology Electrical and HVAC / R AAS degree
GSCC (Gadsden Community College)

Mainstream Engineering EPA Certifications, Inc. - HVAC/R-
Section 608, R-410A, Tech and PM (preventive maintenance)

I feel like I been doin A / C on another planet over the last 20 years ...

because where I come from ...

R (Red) - 24v
W (white) - Heat
Y (Yellow) - Contactor
G (Green) - Fan
O / B (orange / blue / brown) - Passage
C (black / brown / gray) - Common

In any case the colors do not make a difference Flag

Generally, the wiring is low voltage, so little, if all requirements of the code ... that is, you can run the smaller gauge wire behind walls, in bulk, that is not in the pipe, or shielded cable, similar to telephone wiring.