Mercury Contactor Wiring Diagram

On position is up for a normally open application or down for a normally closed application. The 24 volts comes from a low voltage transformer.

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Mercury contactor wiring diagram. View and download white rodgers 1f83 277 user manual online. Thermostat wiring colors code hvac control safety and standards. The three basic ways of controlling a bunch of power 30 100 amps 1 or 3 phase power are a contactor a mdr or an ssr. All of these are relays and a relay is a device for switching on and off power in one circuit with another circuit which may be of a different voltage for convenience. The transformer has a primary high voltage side and a secondary low voltage side. Power control relays. Th8320u and th8321u touch screen programmable thermostats 69 1706 2 do not install the thermostat where it can be affected by. Heating air conditioning non programmable auto changeover multi stageheat pump thermostat. S drafts or dead spots behind doors and in corners. Off position is down for a normally open application or up for a normally closed application there may be a problem with the wiring the control switch or other panel components. Mounting and wiring this thermo stat i s config ured from the f actory to oper ate a he at cool fo ssil f uel g as oil etc forced air system. 1f83 277 thermostat pdf manual download. The r terminal is the 24 volt hot feed from the control step down transformer that will power the relay contactor or complete the circuit in the circuit board feeding it with 24 volts when the thermostat calls for whatever it is set for. You will always want to follow the thermostat manufacturers instructions whenever changing the thermostat. View and download trane vav ucm 42 installation maintenance manual online.

Focuspro th5220d non programmable digital thermostat 3 remove the wallplate from the ther mostat as shown at leftthen follow directions below for mounting.