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» Support CH400SA

Wiring Information and Troubleshooting
  • This page provides general guidance for wiring your LUX 24VAC mechanical thermostat. For more detailed information please refer to the instructions that came with your thermostat..
  • Please make specific note regarding LOW VOLTAGE and LINE VOLTAGE directions. Do not install LINE VOLTAGE wires to a LOW VOLTAGE control. Improper installation of a "C" wire may cause damage to your system.
  • Do no install a wire labeled "TC" from the previous thermostat to any of our controls. Installation of a "TC" wire may cause damage to your system.
  • Do NOT wire by color of the wire, wire by the LETTER designation to which the wire was attached on the previous control.
  • If there were no letter designations on your old thermostat, contact our Technical Assistance Department for assistance.
  • The instruction manual for this model can be viewed in PDF format by clicking here.

Model CH400SA
   
Problem Resolution
LINE VOLTAGE, 110, 120, or 240 volt wires on the previous voltage controls. 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. 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. 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. This system employs 3 wire zone valves. Please use our TX9100E or similar for this system.
Three LOW VOLTAGE wires were connected to the existing thermostat for a heat only, forced water system that DID have a clock or timer. 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. 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. Currently LUX does not produce a thermostat capable of controlling this type of heat and cooling system.
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. 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. 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. 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. This unit is not compatible may most Heat Pump HVAC systems. It does not have "B" or "O" terminals. Refer to Lux or LuxPro selection guide to find a compatible thermostat.
For further assistance: Contact your HVAC service company or our Technical Assistance Line if not resolved.
 
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