Indoor Thermostat: Difference between revisions
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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 : | |||
| | ||
Revision as of 17:38, 10 February 2009
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 :