Difference between revisions of "Indoor Thermostat"

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(Hot Wire Testing)
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== Hot Wire Testing ==
 
== Hot Wire Testing ==
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Shorting or Hot Jumping is risky and can in face damage your system.  Certain brand and models work differently from what is commonly known.  Use this as a general reference but do not proceed unless you have research your system brand and model.
  
 
=== 5 Wire Red, Blue, White, Green, Yellow ===
 
=== 5 Wire Red, Blue, White, Green, Yellow ===

Revision as of 21:24, 29 June 2011

A building thermostat is a device to control the heating and air-conditioning systems in a home, office, or other indoor environment.

The majority of modern heating/cooling/heat pump thermostats operate on 24 volts A/C.

4 Wire 24V HVAC Thermostat Wire Diagram

W : White Wire : Heat

Y : Yellow or Black Wire : Cool

G : Green : Fan

R : Red : 24v

Jump W + R will turn on heater on a gas operated HVAC system. On the gas system the fan is triggered automatically at the heater when a certain temperature is reached.

Jump G + R to force the fan to turn on

Honeywell's round mechanical mercury thermostat "The Round" has 6 connectors. Only 4 are necessary for a typical HVAC system.

B : black

G : green : Fan

Y : yellow : Cool

W : white : Heat

R : red : 24v

O : orange

A modern electronic thermostat may have as many as 8 connectors. To connect this to a 4 wire 24v system use the following:

W : white : heat

Y : yellow or black wire : cool

G : green : fan

B :

O :

RC : red wire : 24v - bridge to RH

RH : red wire : 24v - bridge to RC

C :

Hot Wire Testing

Shorting or Hot Jumping is risky and can in face damage your system. Certain brand and models work differently from what is commonly known. Use this as a general reference but do not proceed unless you have research your system brand and model.

5 Wire Red, Blue, White, Green, Yellow

  • Red + Yellow - turns on the Air Conditioner
  • Red + Green - turns on the blower fan
  • Red + White - turns on heat