Honeywell R7426A, R7426B, R7426C dimensions Y1CTRF

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

 

config. par.

 

 

description

 

 

default

 

 

R7426

 

actual

 

 

 

 

 

 

 

 

 

 

setting

 

 

 

 

 

 

 

 

 

 

no.

 

 

name

 

 

 

 

 

 

A

 

B

 

C

 

value

 

 

 

 

 

 

 

 

 

 

I / II

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C.12

T2ext

Enable / Disables the T1 sensor input to be used for both T1 and T2 inputs.

0

 

 

x

x

x

 

 

 

 

 

 

 

 

0

T2 installed

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

T1 signal used for T2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C.13

LimTyp

Limitation type determines whether the limit function is low or high.

0 / 1

 

 

x

x

x

 

 

 

 

 

 

 

 

0

Low limit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

High limit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C.14

 

Senstyp

Sensor type determines automatic detection or manual selection of NTC

0

 

 

x

x

x

 

 

 

 

 

 

 

 

sensors.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

Auto detection

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

NTC sensor type

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C.15

 

Y1CTRF

Controls the action of Y1 or activates the occupancy input for summer/winter

0 / 1

 

 

x

x

x

 

 

 

 

 

 

 

 

changeover.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R7426A

R7426B,C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

cooling

0

mixed air damper

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

heating

1

energy recovery

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

summer/winter changeover

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C.16

 

AddHour2)

Adjusts the month for winter/summer time change.

3

 

 

x

x

x

 

 

 

 

 

 

 

 

Min.

0 (disables winter/summer time change)

 

(March)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Max.

12

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C.17

 

SubHour2)

Adjusts the month for summer/winter time change.

10

 

 

x

x

x

 

 

 

 

 

 

 

 

Min.

0 (disables summer/winter time change)

 

(Oct.)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Max.

12

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C.18

 

PSTG_H2) 3)

Determines the prestart gradient to reach the comfort setpoint for heating.

 

0 K/min

 

x

x

x

 

 

 

 

 

 

 

 

Min.

0 (disabled)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Max.

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C.19

 

PSTG_C2) 3)

Determines the prestart gradient to reach the comfort setpoint for cooling.

 

0 K/min

 

x

x

x

 

 

 

 

 

 

 

 

Min.

0 (disabled)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Max.

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C.20

 

tvd2)

Determines the damper prestart time before scheduled comfort mode

 

15 min

 

 

 

x

x

 

 

 

 

 

 

 

 

Min.

0 (normal control)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Max.

90

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C.21

Adapt2)

Optimum Start Self Adaption speed

 

 

50%

 

 

x

x

x

 

 

 

 

 

 

 

 

Min.

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Max.

100

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C.22

Adr1)

Sets the serial communication address, used for service or maintenance.

254

 

 

x

x

x

 

 

 

 

 

 

 

 

Min.

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Max.

255

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C.23

 

DefProg

Initiates the default programming.

 

 

0

 

 

x

x

x

 

 

0No Default programming

1Initiates Default programming

1)actual value will not be changed during reset to default parameter

2)on Controllers with Real-Time Clock, only

3)can be overwritten by controller for self-adaption purposes, resolution = 0.01 K/min

For detailed information of configuration parameters see chapter Configuration Settings.

Table 4. Configuration parameters R7426A,B,C (part 2)

EN1B-0203GE51 R0507C

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Contents General Before Installation NoteMounting Wiring Power Supply and GroundingTerminal Connection Controller to CPA/SPA potentiometer TerminalConfiguration and Control Parameters Y1CTRF Soffs MinposNoffs Configuration Settings Control Point / Setpoint Adjustment Cpatyp C.05Operating Range Selection Ctrltyp C.04 Output Control Range Selection YRange C.06Output Signal Mode YMode C.11 Supply of Temperature Signal T2 T2ext C.12Limit Type LimTyp C.13 Sensor Type Senstyp C.14Parameter Settings Adjustment Reset Time tr1 / tr2 P.12 / P13 Throttling range and reset time reference Application SensThrottling Range Xpc / Xph P.10 / P11 Tr1 Tr2Night Mode Offset Noffs P.26 Controller with RTC only Start Point Ystart P.15Compensation Changeover Point Wcomp P.03 Summer / Winter Compensation Authority Su / Wi P.04 / P.05Operating Overview Return Air Offset RetOffs P.20Minimum Position Minpos P.14 Runtimex, x = Y1, Y2, or Y3 P.21...P.23Changing Operating Modes Operating overviewStandard display mode Time OutAdjusting Configuration / Parameter Values Resetting Param. Values to Default ValuesDisplaying Actual Values Selecting ParametersOutput Selection Mode Example of annual schedule no default Using the Schedules with RTC, onlyDay1 Point Selecting Clock and Schedules with RTC, only Adjusting Date and Time with RTC, onlyProgramming Standard Schedule with RTC, only Interpreting Error Messages Programming Holiday Schedule with RTC, onlyAnnual schedule Automation and Control Solutions Weekly schedule and holiday types

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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