Lux Products Where to Buy Support What's New Contact Us Home  
Support PSD111
 

Wiring Information and Troubleshooting

« Back to Main Support Page

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 PSD111
   
Problem Resolution
ALL Never connect a low voltage thermostat to line voltage.
Mis-wiring a system common wire may damage your thermostat and or you HVAC system.
If a system had two clock wires, they are likely connected to a separate transformer. If so, these wires should be taped off and not used.
Power This unit may be battery powered or system powered.
Battery Power If you want to power the unit from batteries only.
Do not connect any system common wire to the thermostat.
Do not connect any wire to the thermostat "C" terminal.
System Power To power the unit from the system, connect a system common wire to the thermostats "C" terminal. 
Two wires control a heat only system Connect one wire to W and the other to RH.
Two wires control a cool only system Connect one wire to RC and the other to Y.
Three wires for forced air heat only system, where the previous thermostat did not have a clock The previous R, RH or RC wire is the 24-volt transformer wire. Connect it to RH.
Jumper RH to RC. 
Connect the forced air heat system to W.
Connect the fan wire to G.
Three wires for a heat only, forced water system that did NOT have a clock This system employs 3 wire zone valves. Please use our P521U, P621U, P722U, P721UT, or PSP721U models for this heating system.
Three wires control  a heat only, forced water system that DID have a clock 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.
Four wires control a heat only system, and two of the wires operated a clock. The other two wires operate the heater 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. The jumper connecting RH to RC may remain or be removed.
Two wires control heating AND cooling Currently no Lux controls are compatible with this system.
Three wires control heating and cooling. One wire operates heat, one operates cooling and the third provides 24 VAC Connect the 24-volt power wire to RH.
Install a jumper connecting RH to RC. This jumper is usually pre-wired.
Connect the heat wire to W.
Connect the cooling wire to Y.
Three wires control a cooling only system. One wire operates the compressor, one operates the fan and the third provides 24 VAC Connect the 24-volt power wire to RC. The jumper connecting RH to RC may remain or be removed.
Connect the cooling wire to Y.
Connect the fan wire to G. 
Four wires control a heating and cooling, electric, gas or oil, forced air system that is NOT a heat pump Connect the 24 VAC transformer wire to RH or RC.
Install a jumper connecting RH to RC This jumper is often prewired.
Connect the heat wire to W.
Connect the cooling wire to Y.
Connect the fan wire to G.
Five wires control a Single Stage Heat Pump. They were labeled: G, Y, R or RH or RC, with either B or O 1. If a previous thermostat had a wire connected to an O terminal connect that wire to this thermostats O terminal. Verify that the unit is operating correctly immediately following this installation.
2. If a previous thermostat had a wire connected to a B terminal connect that wire to this thermostats B terminal. Verify that the unit is operating correctly immediately following this installation.
3. Install a jumper wire from RH to RC.
4. Connect 24 VAC wire to RH also.
5. Install a second jumper wire from W to Y.
6. Connect compressor wire to Y.
7. Connect the fan wire to G.
8. If after installation, a heat pump system heats when set to cool and cools when set to heat move the B wire to O or vice versa.  Verify that the unit is operating correctly immediately following this installation.
More than 5 wires are connected to the old thermostat Contact our Technical Assistance Line.


Top

 

 
© 2013 LUX Products Corporation - All Rights Reserved