Selecting Clock and Schedules with RTC, only

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

Selecting Clock and Schedules (with RTC, only)

DATE & TIME	DATE & TIME
SELECTION	ADJUSTMENT
STANDARD	STANDARD
SCHEDULE	SCHEDULE
SELECTION	PROGRAMMING
HOLIDAY	HOLIDAY
SCHEDULE	SCHEDULE
SELECTION	PROGRAMMING

Fig. 13. Clock and schedules selection mode

The clock and schedule selection mode is provided to select real-time clock (RTC), standard schedule (SCH), or holiday schedule (Hol) for programming (see Fig. 13).

Pushing the + or - button scrolls through the selection list.

Adjusting Date and Time (with RTC, only)

This mode is used to adjust date and time (real-time clock) by the input sequence shown in Fig. 14.

During date adjustment, the weekday is calculated auto- matically and need not be programmed. The 29th of February is adjustable only for leap years.

Pushing the SEL button returns to the selection mode, ignoring adjustments which have not been confirmed by the SET button.

Due to battery change or low battery, the date / time can be invalid and is displayed as --.--.-- / --:--on the LCD. In this case the controller behaves like a controller without real-time clock. If the occupancy input is inactive, the controller will be assumed as occupied.

	OR	TO ADJUST
TIME ADJUSTMENT	OR	HOURS
		HOURS
	OR	TO ADJUST
		TO ADJUST
		MINUTES
		MINUTES
		Date
	OR	TO ADJUST
	OR	YEAR
ADJUSTMENTDATE		YEAR
ADJUSTMENTDATE		Date

	OR	TO ADJUST
	OR	MONTH
		MONTH
		Date
	OR	TO ADJUST
	OR	DAY
		DAY

Fig. 14. Date and time adjustment mode

Programming Standard Schedule (with RTC, only)

The standard schedule programming is used to program up to 6 schedule points for each weekday as well as for three holiday types. The controller mode (off, night, standby or comfort) will be switched at these programmed schedule points.

The first step of the schedule programming (see Fig. 15) is to select a weekday or holiday type as follows:

1.Mo ... Su as single

2.H1 ... H3 as single

3.Mo ... Fr grouped

4.Sa and Su grouped

5.Mo ... Su grouped

The switching time is adjustable in steps of 10 min. To ignore a schedule point, the displayed switching time must be set to ‘--:--’ by adjusting it between step 23:50 and 0:00 or by

pushing the + and - button simultaneously.

Pushing the SEL button returns to the selection mode, ignoring adjustments which have not been confirmed by the SET button.

	TO SELECT
OR	WEEKDAY,
OR	WEEK GROUPS,
	OR HOLIDAY
	TYPES
OR	TO ADJUST
OR	SCHEDULE
	POINT
	Tu
OR	TO ADJUST
OR	SWITCHING
	TIME
	Tu
OR	TO ADJUST
OR	CONTROLLER
	MODE
	Tu

Fig. 15. Standard schedule programming

17	EN1B-0203GE51 R0507C

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.