To Next PageTo Next PageWhy is my Lennox X4147 heating or cooling not coming on?
If the heating or cooling isn't activating on your Lennox Thermostat, it could be due to a few reasons. The thermostat's minimum-off time might be activated; wait up to 5 minutes for the system to respond. Also, ensure that the system selection is set to heat or cool and verify that the system type selection is correct by checking installer setup number 0170.
Why is my Lennox X4147 Thermostat display not coming on?
If the display on your Lennox Thermostat isn't turning on, the thermostat might not be receiving power. Make sure there is 24V between the R and C terminals and that the batteries are properly installed.
What to do if my Lennox X4147 is not responding when I press the touch screen?
If your Lennox Thermostat's touch screen isn't responding, the keypad might be fully locked. Check installer setup number 0670 and change the keypad lock option if necessary.
What to do if my Lennox X4147 Thermostat is calling for heat or cool, but the HVAC system isn't operating?
If your Lennox Thermostat indicates it's calling for heat or cool but the HVAC system isn't responding, the heating or cooling equipment might not be operating. First, check the wiring. Second, verify that the system type is correctly selected in installer setup number 0170. Finally, verify the equipment's operation in system test mode.
Why is my Lennox Thermostat not changing temperature settings?
If your Lennox Thermostat isn't allowing you to change temperature settings, it could be due to a couple of reasons. One possibility is that you've reached the upper or lower temperature limits. Check the temperature setpoints and installer setup numbers 0600 and 0610, modifying them if needed. Another reason might be that the keypad is fully locked. In this case, check installer setup number 0670 and change the keypad lock option if necessary.
Overview of the 3 Heat / 2 Cool Programmable Touch Screen Thermostat.
Configuring dual fuel heat pump with auxiliary heat.
Heating operation based on outdoor temperature relative to balance point.
Operation modes for emergency heating.
Configuring electric auxiliary heat with outdoor temperature sensor.
Heating operation based on outdoor temperature relative to lock-out temperatures.
Operation modes for emergency heating.
Steps for accessing and navigating the installer set-up menu.
Reference table for installer set-up numbers and their descriptions.
The Lennox X4147 is a programmable touch-screen thermostat designed to provide precise control over various HVAC systems. It is capable of managing up to three stages of heating and two stages of cooling, making it suitable for a wide range of residential and light commercial applications. This thermostat can be configured to control either conventional HVAC systems, which typically include an outdoor condensing unit and an indoor furnace, or heat pump units with an indoor air handler.
The primary function of the Lennox X4147 thermostat is to regulate indoor temperature by controlling heating and cooling equipment. It offers programmable scheduling, allowing users to set desired temperatures for different times of the day and days of the week, optimizing energy consumption and comfort. The touch-screen interface provides an intuitive way to interact with the device, displaying current temperature, set temperature, time, and system status.
For conventional systems, the thermostat manages the furnace (gas, oil, or electric heat) and central air conditioning. In heat pump applications, it controls the heat pump unit, which can provide both heating and cooling, often with auxiliary or back-up heat sources. The terminal block of the thermostat accommodates 24V common power from the furnace or air handler, ensuring reliable operation. Additionally, three AAA alkaline batteries are included, serving as an alternate power source or a back-up in case of a power interruption, thus maintaining settings and basic functionality.
The thermostat supports various system types, including single-stage heating and cooling, multi-stage conventional systems, heat-only systems (with or without a fan), cool-only systems, hot water heat-only systems, and various heat pump configurations (with or without auxiliary heat). This versatility allows it to be integrated into diverse HVAC setups.
An optional outdoor temperature sensor (X4148) can be installed with the thermostat. This sensor provides outdoor temperature readings, which can be displayed on the screen and, in heat pump applications, used to control compressor lock-out settings based on a defined balance point temperature. This feature helps optimize heat pump efficiency by preventing compressor operation when outdoor temperatures are too low for effective heat pump performance, instead relying on auxiliary heat.
The thermostat also includes an equipment monitor function, indicated by an LED light in the upper right corner. When an equipment monitor is connected to the L terminal, the LED illuminates if the monitor sends a check or failure message to the thermostat, providing an early warning of potential system issues. This LED requires 24Vac common power to function.
The touch-screen interface is central to the user experience. It displays key information such as the current indoor temperature, the set temperature, the current time, and the day of the week. Users can easily adjust temperature settings using up and down arrows on the screen. The system mode (e.g., Heat, Cool, Auto, Off) and fan mode (e.g., Auto, On) can be selected through the touch screen.
Programmable scheduling is a significant feature, offering 7-day programming with multiple periods (wake, leave, return, sleep) per day. This allows users to customize temperature settings to match their daily routines, ensuring comfort when needed and saving energy when the space is unoccupied. The thermostat supports different numbers of periods, such as two (wake and sleep) or four (wake, leave, return, sleep), depending on user preference.
The thermostat includes an "Adaptive Intelligent Recovery" feature, which allows the system to start heating or cooling early to ensure that the setpoint temperature is reached by the beginning of a programmed period. This contrasts with "Conventional Recovery," where the system starts recovery at the programmed time, potentially leading to a delay in reaching the desired temperature.
For heat pump applications, the thermostat can be configured to operate with or without an external dual fuel kit. When no external kit is used, the thermostat directly controls dual fuel operation, using the outdoor temperature sensor to manage the balance point between compressor and fossil fuel auxiliary heat. If an external dual fuel kit is present, the kit dictates heat pump auxiliary heat control.
Other user-configurable settings include the temperature display scale (Fahrenheit or Celsius), daylight savings options (disabled, pre-2007 calendar, or 2007 DST calendar), and keypad lock-out levels (unlocked, partially locked, or fully locked). A partially locked keypad allows only temperature adjustments and access to installer set-up, while a fully locked keypad restricts all functions except installer set-up access.
The thermostat also features a "Dead-band" setting, which defines the minimum differential between heating and cooling setpoints. This prevents the system from rapidly switching between heating and cooling modes, improving system efficiency and longevity.
The Lennox X4147 incorporates several features designed to assist with maintenance and system monitoring. It includes reminders for routine maintenance tasks, such as filter changes, humidifier pad replacements, and UV lamp replacements. These reminders can be set based on run time days (e.g., 10, 30, 60, 90, 120, or 365 days), helping users keep their HVAC system in optimal condition.
The installer set-up menu provides a comprehensive suite of options for configuring the thermostat to match the specific HVAC system. This menu is accessible by a qualified service technician or agency and allows for detailed adjustments to system type, fan control, auxiliary heat source, cycles per hour (cph) for various stages of heating and cooling, compressor lock-out settings, and heating/cooling mode control aggressiveness.
A "System Test" function is available within the installer set-up menu. This feature allows technicians to test the operation of different HVAC components (cooling stages, fan, heating stages, emergency heat) directly from the thermostat. During the system test, the compressor minimum-off time is bypassed, enabling quick verification of equipment functionality. This is crucial for ensuring that the HVAC system responds correctly to thermostat commands after installation or servicing.
The thermostat also offers troubleshooting guidance. The manual provides a table outlining common symptoms (e.g., display not coming on, temperature settings not changing, heating/cooling not activating), possible causes (e.g., no power, keypad locked, incorrect system selection), and recommended actions. This resource helps in diagnosing and resolving operational issues efficiently.
For power management, the thermostat can be powered by 24V common wire or by three AAA alkaline batteries. If the 24V common power is interrupted, the batteries serve as a backup, preserving settings and basic functionality. The continuous backlight feature, if enabled, requires 24V common power.
The "Reset Thermostat" option in the installer set-up allows for resetting all installer set-up options to default values and resetting the schedule to its default setting, while retaining calendar settings and time. This can be useful for reconfiguring the thermostat or troubleshooting persistent issues.
Proper installation is emphasized, requiring the use of minimum 18 gauge wire for all connections and adherence to wiring diagrams to prevent damage to the HVAC system. The manual also includes a mercury notice, instructing proper disposal of old thermostats containing mercury bulbs, highlighting environmental responsibility.
General| Product Type | Thermostat |
|---|---|
| Connectivity | Wired |
| Voltage | 24V |
| Features | Touchscreen |
| Function | Heating and Cooling |
| Wireless Communication | No |
