| 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 PSP721U for this 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. |
