Honeywell BDR91 Installation Manual

3) Basic Operation of the System

3.1 Automatic Operation

The Relay Box receives the heat demand (0- 100%) signal from the room thermostat. The room thermostat will display the symbol on the LCD display whenever more heat is required. Depending on the demand the Relay Box will switch the heating device on to match the current requirements of the system.

The green LED indicates the status of the relay output:

•Green LED on = relay on

•Green LED off = relay off

BDR91 Relay Box

Push button and relay status LED’s

3.2 Temporary Manual Override

Pressing the Relay Box button will override the current relay position. As soon as the next signal is received from the room thermostat the Relay Box will return back to automatic operation as the automatic control has higher priority than manual operation.

3.3 Communications Loss

If the RF communication is lost for a period of 1 hour the red LED will illuminate to indicate that no RF messages have been received during the last hour.

The Relay Box will also enter the failsafe mode as selected in Installer Mode (see section 4.2 BDR91 Relay Box Fail-Safe Mode Setup). To allow manual control of the Relay Box output manual override is available in fail-safe mode. When RF communication is restored the Relay Box will automatically return to normal operation.

You can now use the USER GUIDE supplied with the room thermostat to demonstrate how it works to the home owner.

4) Installer Mode

Installer Mode is used to alter the system settings for specific applications, to use the special features of the room thermostat in a different way or to alter the factory preset parameters. Parameters are divided into two groups:

-Category 1 parameters – Room Thermostat Setup

-Category 2 parameters – System Setup.

These are all listed in section 4.5 Installer Parameters Table.

6	CM900 Wireless - Programmable Room Thermostat

CM900 specifications

The Honeywell CM900 is a sophisticated programmable room thermostat designed to enhance energy efficiency and ensure optimal comfort in residential settings. This device is characterized by its advanced features, which cater to the increasingly demanding needs of modern households.

One of the standout features of the CM900 is its intelligent programming capabilities. Users can easily set different heating schedules for weekdays and weekends, allowing for personalized comfort that adapts to the household's routine. This programmable functionality not only maximizes comfort but also contributes to energy savings, as it can automatically lower the heating during unoccupied periods.

The CM900 is equipped with a user-friendly interface that makes it straightforward to adjust settings. The large, clear display provides essential information at a glance, such as current room temperature and set points. Additionally, the intuitive menu navigation allows users to customize settings quickly, ensuring a seamless experience even for those who may not be technically inclined.

Incorporating the latest technology, the Honeywell CM900 features an innovative adaptive control system. This technology enables the thermostat to learn the heating characteristics of the home, adjusting pre-heat times to ensure that the desired temperature is reached precisely when needed. As a result, users can enjoy comfortable living spaces without wasting energy.

The CM900 also boasts an impressive response time, ensuring that any adjustments to the heating system occur swiftly. Coupled with precise temperature sensing, this allows for a stable indoor climate, which is essential for both comfort and energy efficiency. The device can be connected to various heating systems, making it a versatile option for a range of home heating configurations.

For those interested in further customizing their heating experience, the Honeywell CM900 offers compatibility with multiple accessories, including remote sensors and Wi-Fi connectivity options. This enables homeowners to monitor and adjust their heating systems even when they are away from home, leading to added convenience and peace of mind.

In summary, the Honeywell CM900 is a high-performance programmable thermostat that combines advanced technology with user-centric features. Its intelligent scheduling, adaptive control, and ease of use make it an excellent choice for anyone looking to achieve a perfect balance between comfort and energy efficiency in their home.