1. Introducción y másview
This manual provides comprehensive instructions for the installation, operation, and maintenance of the LUX PSM400SA Horizontal 24VAC Thermostat. This low-voltage thermostat is designed for heating and cooling systems, featuring a snap-action mechanism and an adjustable heat anticipator for precise temperature control. Please read this manual thoroughly before installation and operation to ensure proper function and safety.

Figura 1: Frente view of the white LUX PSM400SA horizontal thermostat. The display shows temperature markings from 50 to 90 degrees Fahrenheit, and the system and fan switches are visible at the bottom.
2. Información de seguridad
- ADVERTENCIA: Always disconnect power to the heating/cooling system at the main fuse or circuit breaker panel before installing, removing, or servicing the thermostat. Failure to do so may result in electrical shock or equipment damage.
- Installation should be performed by a qualified technician if you are unsure about electrical wiring procedures.
- Do not short thermostat terminals.
- Asegúrese de que todas las conexiones del cableado sean seguras y cumplan con los códigos eléctricos locales.
3. Contenido del paquete
Verifique que su paquete contenga los siguientes elementos:
- 1 x LUX PSM400SA Thermostat Unit
- 1 x Guía de instrucciones (este manual)
4. Características
The LUX PSM400SA Thermostat offers the following key features:
- Vol bajotage Operation (24V AC)
- Horizontal Mounting Design
- System Switching: Heat-Cool-Off
- Fan Switching: Auto-On
- Control Range: 45°F to 90°F
- Snap Action Mechanism for reliable switching
- Adjustable Heat Anticipator for enhanced comfort
- 750mV Compatible
- Terminal Designations: G, Y, W, RH, RC
- Hardwired Power Method
5. Instalación (Configuración)
Follow these steps to install your new thermostat:
- Desconexión de energía: Turn off the power to your heating and cooling system at the main fuse or circuit breaker panel. This is a critical safety step.
- Retire el termostato viejo: Carefully remove the cover of your old thermostat. Disconnect the wires one by one, noting the terminal designation for each wire (e.g., G, Y, W, R). It is recommended to label each wire with its corresponding terminal letter.
- Mounting the New Thermostat Base: Secure the base of the LUX PSM400SA thermostat to the wall using the provided screws and anchors. Ensure it is level for aesthetic purposes.
- Alambrado: Refer to the 'Wiring' section below for detailed connection instructions.
- Fijar el cuerpo del termostato: Once wiring is complete, carefully attach the thermostat body to its base.
- Restaurar energía: Vuelva a encender el sistema de calefacción y refrigeración en el panel de fusibles o disyuntor principal.
6. cableado
Connect the wires from your HVAC system to the corresponding terminals on the LUX PSM400SA thermostat base. The terminal designations are as follows:
- G: Connects to the fan relay.
- Y: Connects to the compressor contactor (for cooling).
- W: Connects to the heat relay (for heating).
- RH: Connects to the 24VAC heating power supply.
- RC-Reino Unido: Connects to the 24VAC cooling power supply.
Notas importantes sobre el cableado:
- If your system has separate wires for heating (RH) and cooling (RC), connect them to their respective terminals.
- If your system has only one 'R' wire (common for both heating and cooling), connect it to the RH terminal. In this case, ensure the jumper between RH and RC is in place (if provided, or create one if necessary) to provide power to both heating and cooling circuits.
- This thermostat is hardwired and does not require batteries.
7. Operación
Once installed and powered, operate your thermostat using the following controls:
- Interruptor del sistema: This switch allows you to select the operating mode for your HVAC system.
- CALOR: El termostato controlará su sistema de calefacción para mantener la temperatura establecida.
- FRIO: The thermostat will control your cooling system to maintain the set temperature.
- OFF: The heating and cooling systems are turned off. The fan can still be operated manually if the fan switch is set to 'ON'.
- Interruptor de ventilador: This switch controls the operation of your system's fan.
- COCHE: The fan will run only when the heating or cooling system is actively operating to reach the set temperature.
- EN: El ventilador funcionará continuamente, independientemente de si el sistema de calefacción o refrigeración está activo.
- Ajuste de temperatura: Use the temperature dial or slider on the thermostat to set your desired room temperature. The thermostat will then work to maintain this temperature within its control range of 45°F to 90°F.
8. Mantenimiento
The LUX PSM400SA thermostat requires minimal maintenance to ensure optimal performance.
- Limpieza: Para limpiar el termostato, limpie suavemente el exterior con un paño suave y ligeramente húmedo.amp Paño. No utilice limpiadores abrasivos, disolventes ni aerosoles químicos, ya que pueden dañar el acabado del termostato o los componentes internos.
- Reemplazo de batería: This model is hardwired and does not utilize batteries for operation. Therefore, no battery replacement is necessary.
- Flujo de aire: Ensure that the thermostat is not obstructed by furniture, curtains, or other objects that could interfere with proper airflow and temperature sensing.
9. Solución de problemas
Si tiene problemas con su termostato, consulte los siguientes problemas y soluciones comunes:
| Problema | Posible causa | Solución |
|---|---|---|
| No power to thermostat/system | Blown fuse or tripped circuit breaker; incorrect wiring. | Check the main fuse or circuit breaker. Verify all wiring connections are secure and correct. |
| El sistema de calefacción/refrigeración no responde | System switch set to OFF; temperature setting too high/low; wiring issue. | Ensure the system switch is set to HEAT or COOL. Adjust the temperature setting to be above (for heat) or below (for cool) the current room temperature. Check wiring. |
| El ventilador no funciona | Fan switch set to AUTO when system is off; wiring to G terminal. | Set the fan switch to ON to test continuous operation. If still not working, check the wiring to the 'G' terminal. |
| Lectura de temperatura inexacta | Termostato expuesto a la luz solar directa, corrientes de aire o fuentes de calor. | Ensure the thermostat is located in an area free from direct sunlight, drafts, or heat-emitting appliances. |
If these steps do not resolve the issue, please contact customer support or a qualified HVAC technician.
10. Especificaciones
| Número de modelo | PSM400SA |
| Marca | LUX |
| Volumentage | 24 V CA |
| Rango de control | 45 °F a 90 °F (7 °C a 32 °C) |
| Montaje | Horizontal |
| Dimensiones (alto x ancho x profundidad) | 3 3/4 in x 3 3/4 in x 2 in (approx. 9.5 cm x 9.5 cm x 5 cm) |
| Color | Blanco |
| Designaciones de terminales | G, Y, W, RH, RC |
| Método de potencia | Cableado |
| 750mV Compatible | Sí |
| Fabricante | Lujo |
| País del fabricante | Porcelana |
11. Garantía y soporte
For detailed warranty information, technical assistance, or to purchase replacement parts, please visit the official LUX webSitio web o contacte directamente con el servicio de atención al cliente. Conserve su recibo de compra como comprobante para cualquier reclamación de garantía.
Atención al cliente de LUX: Refer to the contact information provided with your product packaging or on the official LUX websitio.





