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» Support T40-1143SA

Wiring Information and Troubleshooting

Model T40-1143SA
   
Problem Resolution
LINE VOLTAGE, 110, 120, or 240 volt wires on the previous voltage controls.
  1. NEVER Connect LINE VOLTAGE WIRES TO A LOW VOLTAGE THERMOSTAT. Follow the wiring instructions for your control.
 
Two 24 volt, LOW VOLTAGE wires
on existing control for a heat only system.
  1. Connect one to W and the other to RH.
   
Three LOW VOLTAGE wires were connected to the previous thermostat for a heat only, forced air system where one wire
operates the fan.
  1. Use jumper provided to connect RH to RC. Connect the R or RH 24VAC transformer wire to RH or RC. The heat wire goes to W and the fan to G. For electric heat, move factory-installed jumper wire at Y to A.
 
Three LOW VOLTAGE wires were connected to the thermostat for a heat only, forced water system
that did NOT have a clock or timer.
  1. No current Lux controls are compatible with this system. Do not use.
   
Three LOW VOLTAGE wires were connected to the existing thermostat for a heat only, forced water system that DID have a clock or timer.
  1. Tape off and do NOT install any clock or timer wire, usually labeled C or TC. Install the remaining two wires, one to W and the other to RH. Move the factory-installed jumper wire from Y to A.
 
Four LOW VOLTAGE wires were connected to the existing
thermostat for a heat only system, and two of the wires operate clock or timer and the other two operate the heater.
  1. Tape off the clock wires. Do not install them on any of our thermostats. Install the remaining two wires, one to W and the other to RH.
   
Two LOW VOLTAGE wires were connected to the existing
thermostat for heating AND cooling.
  1. None of our controls are compatible with this type of system on the cooling side. Do not install.
 
Three LOW VOLTAGE wires were Connected to the existing thermostat for heating and cooling, and one wire operates heat, one operates cooling and the third is 24 volts.
  1. Connect the cooling compressor wire to Y, the heat wire to W, and the 24-volt power wire to RH. Leave the jumper in connecting RH to RC. For electric heat, move the factory-installed jumper wire from Y to A.
   
Three LOW VOLTAGE wires were Connected to the existing thermostat for cooling only, and
one wire operates the cooling compressor, one to the fan and
the third for 24 volts.
  1. Connect the 24VAC transformer wire to RC. Connect the cooling compressor wire to Y, the fan wire to G, and You may remove the jumper connecting RH to RC.
 
Four LOW VOLTAGE wires were Connected to the existing thermostat for a heating and cooling, electric, gas or oil, forced air NOT a heat pump.
  1. Connect the 24VAC transformer wire to RH or RC. Use the jumper connecting RH to RC and connect the heat wire to W. Connect the cooling wire to Y, and the fan wire to G. For electric heat, move the factory-installed jumper wire from Y to A.
 
Four LOW VOLTAGE wires for a single stage heat pump.
  1. Use the jumper connecting RH to RC and connect the 24VAC transformer wire to RH. Connect the heat pump wire to Y, and the fan wire to G. Connect the reversing valve wire that was connected to B or O to same letter on new thermostat. either B or O. Add a jumper wire from Y to W.
   
 
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