R7426A,B,C TEMPERATURE CONTROLLER WITH AND WITHOUT REAL TIME CLOCK

Changing Operating Modes

Fig. 7 shows the six operating modes. After power-up the controller version is displayed and the controller enters the standard display mode. In this mode, selected input or output values and on controllers with real-time clock the time or the date are displayed. The controller mode is permanently displayed by a corresponding icon (Fig. 6).

Pushing the + and - button simultaneously for approximately 1 sec causes the controller to leave the standard display mode and to enter the parameter/configuration selection mode (Fig. 9). This mode is used for application configuration and to select parameters for adjustment.

Pushing the SET button causes the controller to accept the selected parameter or configuration no. and to enter the ad- justment mode (Fig. 10), which is used to adjust configuration

/parameter values. After adjustment, the controller returns to selection mode by pushing the SET or SEL button. Pushing the SEL button leads back to standard display mode.

POWER UP

AUTOMATIC

DISPLAY

Pushing the SET and SEL button simultaneously for approx. 1 sec causes the controller to leave the standard display mode and to enter the output data selection mode (Fig. 11).

Pushing the SET button causes the controller to accept the selected output data no. and to enter the output adjustment mode (Fig. 12). This mode is used for manual override of output values. The return to standard display mode is shown in Fig. 7.

Pushing the SET and - button simultaneously for approx.

1 sec causes the controller to leave the standard display mode and to enter the clock / schedule selection mode (Fig. 13) on controllers with real-time clock, only.

 

 

AND

 

FOR APPROX.

 

 

 

AND

1 SEC

 

 

 

 

 

 

 

 

FOR APPROX.

 

 

 

OUTPUT

OUTPUT

1 SEC

 

PARAM./CONFIG.

PARAM./CONFIG.

STANDARD

 

ADJUSTMENT

SELECTION

DISPLAY

 

SELECTION

ADJUSTMENT

MODE

MODE

MODE

 

MODE

MODE

 

OUTPUT

 

 

 

 

 

FIXING

 

 

 

NO PARAMETER

 

NO OUTPUT FIXING

 

 

 

 

 

VALUE CHANGE

 

 

AND

 

 

 

 

 

 

 

 

RELEASE OF

FOR APPROX.

 

 

 

 

OUTPUT FIXING

1 SEC

 

 

 

 

 

CLOCK /

CONTROLLERS WITH

 

 

 

SCHEDULE

REAL-TIME

 

 

 

SELECTION

CLOCKS, ONLY.

 

Fig. 7. Operating overview

EN1B-0203GE51 R0507C

12

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Honeywell R7426B, R7426A, R7426C dimensions Changing Operating Modes, Operating overview
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R7426C, R7426A, R7426B specifications

Honeywell's R7426 series comprises three advanced models: R7426B, R7426A, and R7426C. These devices are designed to optimize control for HVAC applications, emphasizing energy efficiency, ease of use, and superior control capabilities. Each model incorporates unique features and technologies catering to specific system requirements while maintaining common foundational characteristics.

The R7426B is engineered with a microprocessor-based control system, allowing for precise temperature management across varied environments. It supports a range of heating and cooling applications, making it versatile in both residential and commercial settings. The unit boasts dual-stage heating and cooling capabilities, ensuring optimal comfort by allowing for gradual temperature changes. It also includes an easy-to-read LCD display for user-friendly navigation and parameter adjustments.

R7426A enhances functionality with additional communication technologies. This model incorporates Honeywell's proprietary communication protocols, enabling seamless connection with smart thermostats and home automation systems. This ensures users can monitor and control their HVAC systems remotely, leading to enhanced energy management and convenience. R7426A also includes advanced diagnostic capabilities that simplify troubleshooting and maintenance processes.

R7426C further extends the capabilities of the series by integrating state-of-the-art sensors for real-time environmental monitoring. These sensors continuously track indoor air quality parameters such as humidity and particulate matter levels, allowing for immediate adjustments to maintain optimal indoor conditions. The model is also equipped with smart algorithms that learn user preferences over time, automatically adjusting settings to enhance comfort and efficiency.

Common features across the R7426 series include robust construction for long-lasting performance and compatibility with a wide range of HVAC systems, including heat pumps and conventional heating systems. Each model supports programmable settings, enabling users to create schedules that align with their unique lifestyle or business needs. Safety features, including freeze protection and delay timers, are integrated to safeguard against potential system failures.

Overall, the Honeywell R7426B, R7426A, and R7426C models represent a significant advancement in HVAC control technology. With their focus on efficiency, automation, and user-centric design, these devices help users achieve optimal climate management in their spaces while minimizing energy consumption. Whether for residential comfort or commercial efficiency, these models stand out as reliable solutions in the HVAC market.
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