Gas Hvac Wiring


Gas Hvac Wiring - span class news dt may 23 2013 span nbsp 0183 32 gas furnace wiring i have a older gas furnace with a robertshaw 720 series gas valve that is new i am wondering if anyone can tell me how to wire this there is a thermostat transformer high limit blower motor and the valve the valve has three wire terminals 1 to transformer 2 to thermostat and the third is only labeled 3 the line voltage feeding the furnace to operate the fan blower motor is transformed down to a safer level of 24 volts the gas control valve needs 24 volts to open and after making a series loop through at least one safety device the most basic and mandatory one is an over temperature shut down the power goes up to the thermostat and w this is the terminal for heating this wire should go directly to the heating source whether it be a gas or oil furnace electric furnace or boiler or auxiliary heating for a heat pump white for.

w terminal although be aware that this may have changed especially if the person who wired the thermostat didn t use conventional color coding in conventional heating which is oil or gas the furnace controls the fan so only r is connected to w heat for electric heating the thermostat controls the fan g thus in this case both g fan and w heat are connected to r 24 vac for heating applications a lower blower speed is used and the furnace selects it the wiring diagram shows where the wires are mounted to the ponents and usually including wire color codes and sometimes numbers for wire identification the wiring diagram helps locate ponents and wires in the unit that you find in the schematic diagram we are very thankful if you leave a opinion or reviews about this basic hvac wiring furnace gas post we will apply it for better future reports we will apply it for better future reports we thank.

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