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» Support TX9100E

Wiring Information and Troubleshooting
  • This page provides general guidance for wiring your LUX 24VAC electronic 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 TX9100E
   
Problem Resolution
ALL Never connect a low voltage thermostat to line voltage.
Three wires for a heat only, forced water system that did NOT have a clock or timer This system has a 3 wire zone valve. Connect the power wire to the RH terminal, the "valve close" wire to the A terminal and the "valve open" wire to the W terminal. The A terminal is powered on at all times when heat is not on.
Three wires control  a heat only, forced water system that DID have a clock or timer Tape off and do NOT install any clock or timer wire. Often they are labeled C or TC. Install the remaining two wires, one to RH and the other to W.
Five wires control a Heat Pump with an auxiliary heat stage. They were labeled: G, Y, R or RH or RC, and W or W2. Either B or O was used Do not connect wires to both B and O. Connect the reversing valve wire to B or O, just as the previous thermostat. Connect 24 VAC wire to R. Connect compressor wire to Y, fan wire to G, and auxiliary heat wire (usually W or W2) to W2. Add jumper from W1 to Y. 
Four wires control a Single Stage Heat Pump. They were labeled: G, Y, R or RH or RC, with either B or O being used Do not connect wires to both B and O. Connect the reversing valve wire to B or O, just as the previous thermostat. Install a jumper wire from RH to RC. Connect  24 VAC wire to RH too. Install a second jumper wire from W to Y. Connect compressor wire to Y and the fan wire to G. 
I have both a W2 and E wire Tape off and do not use the E wire. Connect the W2 wire to the W2 terminal. The W2 terminal is used for both auxiliary and emergency heating.
Six wires control a Heat Pump with an auxiliary heat stage. They were labeled: G, Y, R or RH or RC, and W or W2. Either B or O was used. And Emergency wire E is  present Do not connect wires to both O and B. Connect the reversing valve wire to O or B, just as the previous thermostat. Connect  24 VAC wire to RH. Connect compressor wire to Y and fan wire to G. It is not necessary to wire the X or X2 terminal. Connect W or W2 to the W2 terminal and add a jumper wire from W1 to Y. If you have a C (common wire) connect it to the C terminal. Move dip switch (labeled OPTION SWITCHES on the back of the thermostat) #1 to the ON position. Make sure that the black jumper on JP2 is in the ELECTRIC position on the circuit board.  Once both of these changes have been made be sure to press the reset button.
For further assistance: Contact your HVAC service company or our Technical Assistance Line if not resolved.
 
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