Honeywell R7426B, R7426A, R7426C Configuration Settings, Operating Range Selection Ctrltyp C.04

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

CONFIGURATION SETTINGS

The controllers R7426A,B are supplied with unconfigured outputs to avoid damage of installed final control devices by supply of not applicable output signals if the controller power supply is turned on.

All configuration parameters must be set to select the correct control functions as required for the job application and to start control operation and synchronization of the final control devices.

Direct - Reverse Action

Dir/Revx, x = Y1, Y2 or Y3 (C.01...C.03)

The output action of the analog outputs on the R7426C controller must sometimes be reversed for a correct opening and closed direction of the valve or damper. This depends on whether the output controls a 2-way or 3-way valve or on the direction the damper shaft moves to open the damper (cw or ccw). It is needed only if the actuator does not provide a direction selector switch, plug, or similar.

In the case of the R7426A,B controllers, the direction can be changed by exchanging the wiring connections open-close (OUT2-OUT1).

Operating Range Selection Ctrltyp (C.04)

The controllers provide two operating ranges which can be selected by the configuration parameter Ctrltyp

(Lo = 0...50°C, Hi1/Hi2 = 0...130°C).

Depending on this parameter setting, the setpoint ranges for the main temperature (W1), limit temperature (Wlim), and submaster temperature (Wcas) are selected for air tem- perature applications (Ctrltyp = Lo) or for flow water temperature applications (Ctrltyp = Hi1/Hi2).

If the configuration parameter Ctrltyp = Hi1, normal operation for flow water application will be performed. If Ctrltyp = Hi2, the following additional function will be active on controllers with real-time clock:

The controller switches the ON/OFF output (e.g. the pump) from ON to OFF if

-the outside air temperature is above 8°C and

-the output signal Y1 = 0% for more than 5 minutes during the controller is in the Comfort, Standby, or Night mode.

Changing the configuration parameter Ctrltyp value from Hi- to Lo control range or vice versa causes the controller to change all parameter values to default, depending on the selected Ctrltyp value.

For a direct parameter reset by the user, refer to chapter How to reset Parameter Values to Default Values? on page 12.

Control Point / Setpoint Adjustment CPATYP (C.05)

The control point or setpoint can be adjusted via the internal or external potentiometer connected to the CPA/SPA input. The potentiometer type is selected by the configuration parameter CPATYP (see Table 6).

Table 6. Selection of CPA/SPA Type

 

CPATYP

CPA / SPA

 

sensor /

 

range

 

remote setpoint unit type

 

 

 

 

CPATYP 0

CPA: ±5 K

 

internal

 

CPATYP 1

CPA: ±5 K

 

T7412B1016 (Pt 1000)

 

(953...1053Ω)

 

 

 

 

 

T7412B1057 (Pt 1000)

 

CPATYP 2

 

 

T7412C1030 (Pt 1000)

 

CPA: ±5 K

 

T7412B1008 (NTC 20kΩ)

 

(100kΩ...0Ω)

 

 

 

 

T7412C1006 (NTC 20kΩ)

 

 

 

 

 

 

 

43193982-001

 

CPATYP 3

SPA:

 

T7412B1024 (BALCO 500)

 

(10...20kΩ)

15 ... 30°C

 

T7412B1040 (Pt 1000)

 

CPATYP 4

CPA: ±5 K

 

HCW 23 (setpoint wheel

 

(0...10kΩ)

 

printed with +/- 5 K)

 

 

 

 

CPATYP 5

SPA:

43193982-001

 

(0...100kΩ)

15...30°C

 

 

 

 

CPATYP 6

SPA: 0...50°C

43193982-001

 

(0...100kΩ)

or 0...130°C

 

 

Output Control Range Selection

YRange (C.06)

The configuration parameter YRange is available only on the R7426C controller and is required to select the output control range (0...100%) to either 2...10 Vdc (YRange = 0) or

0...10 Vdc (YRange = 1). The selected control range is common to all outputs.

Enabling the Start-up Routine (C.07)

A start-up routine is provided to prevent start-up problems for the R7426B,C controllers (three outputs). This routine can be enabled by setting the configuration parameter Startup to ON.

Individual Output Function Selection YxMode, x = 1, 2, or 3 (C.08...C.10)

The R7426A,B controllers provide a choice of output signals suitable for operating a range of final control devices according to the configuration parameter Y1Mode (for R7426A,B) and Y2Mode, Y3Mode (for R7426B, only). Each output can be configured individually by this con- figuration parameter (see Table 7).

Table 7. Individual Output Function Selection

output function

YxMode

(x = 1, 2 or 3)

 

Valve or damper actuators (floating mode)

0

2-stage ON/OFF Sequence Control

1

3-stage Binary ON/OFF Sequence Control

2

Electric Heat Current Valve (pwm output)

3

unconfigured

4

EN1B-0203GE51 R0507C

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Contents Before Installation Note GeneralMounting Terminal Connection Controller to CPA/SPA potentiometer WiringPower Supply and Grounding TerminalConfiguration and Control Parameters Y1CTRF Minpos SoffsNoffs Operating Range Selection Ctrltyp C.04 Configuration SettingsControl Point / Setpoint Adjustment Cpatyp C.05 Output Control Range Selection YRange C.06Limit Type LimTyp C.13 Output Signal Mode YMode C.11Supply of Temperature Signal T2 T2ext C.12 Sensor Type Senstyp C.14Parameter Settings Adjustment Throttling Range Xpc / Xph P.10 / P11 Reset Time tr1 / tr2 P.12 / P13Throttling range and reset time reference Application Sens Tr1 Tr2Compensation Changeover Point Wcomp P.03 Night Mode Offset Noffs P.26 Controller with RTC onlyStart Point Ystart P.15 Summer / Winter Compensation Authority Su / Wi P.04 / P.05Minimum Position Minpos P.14 Operating OverviewReturn Air Offset RetOffs P.20 Runtimex, x = Y1, Y2, or Y3 P.21...P.23Changing Operating Modes Operating overviewStandard display mode Time OutDisplaying Actual Values Adjusting Configuration / Parameter ValuesResetting Param. Values to Default Values Selecting ParametersOutput Selection Mode Using the Schedules with RTC, only Example of annual schedule no defaultDay1 Point Adjusting Date and Time with RTC, only Selecting Clock and Schedules 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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