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Honeywell R7426A - page 1
HONEYWELL Copyright © 2007 Honeyw ell GmbH All Rights Reserved EN1B-0203GE51 R0507C R7426A,B,C TEMPERA TURE CONTROLLER WITH AND WITHOUT REAL-TIME CLOCK INST ALLA TION & ST ART -UP INSTRUCTIONS Fig. 1. T emperature Controller Contents General ................................................................................ 1 Before Insta lla ...
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Honeywell R7426A - page 2
R7426A,B,C TEMPERATURE CONTROLLER WI TH AND WITHOUT REAL-TIME CLOCK EN1B-0203GE51 R0507C 2 WIRING Screwless ty pe, spring loaded terminals are provided on the controllers for panel and field w iring. These terminals are suitable for solid conductors as w ell as tinned or with multicore cable end, stranded wires up to 1.5 mm 2 . T o make a terminati ...
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Honeywell R7426A - page 3
R7426A,B,C TEMPERATURE CONTROLLER WITH AND WITHOUT REAL-TIME CLOCK 3 EN1B-0203GE51 R0507C CONFIGURATION AND CONTROL PARAMETERS The controllers R7426A,B,C include two groups of settings *) (I and II) for control and confi guration parameters that are automatically selected during programming. For parameter Ctrltyp = Lo, setting I is selected, and fo ...
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Honeywell R7426A - page 4
R7426A,B,C TEMPERATURE CONTROLLER WI TH AND WITHOUT REAL-TIME CLOCK EN1B-0203GE51 R0507C 4 config. par. R7426 no. name description default setting I / II A B C actual val ue C.12 T2ext Enable / Disables the T1 sensor input to be used for both T1 and T2 inputs. 0 x x x 0 1 T2 installed T1 signal used for T2 C.13 LimTyp Limitation type determines w h ...
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Honeywell R7426A - page 5
R7426A,B,C TEMPERATURE CONTROLLER WITH AND WITHOUT REAL-TIME CLOCK 5 EN1B-0203GE51 R0507C control par. setting I / setting II R7426 no. name description low high def. reso- lution unit A B C actual val ue P.01 W1 Main setpoint for input T1 0 50 / 130 21 / 70 0.5 ° C x x x P.02 Wlim Limit setpoint (low or high) for input T2 5 / 30 50 / 130 16 / 90 ...
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Honeywell R7426A - page 6
R7426A,B,C TEMPERATURE CONTROLLER WITH AND WITHOUT REAL-TIME CLOCK EN1B-0203GE51 R0507C 6 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 pow er supply is turned on. All configuration parameters must ...
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Honeywell R7426A - page 7
R7426A,B,C TEMPERATURE CONTROLLER WITH AND WITHOUT REAL TIME CLOCK 7 EN1B-0203GE51 R0507C Output Signal Mode YMode (C.11) Sequence Operation The controllers R7426B,C are supplied from the factory configured for sequence operation of heating, mixed air , and cooling control. The sequence operation can be c onfigured for the following control applica ...
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Honeywell R7426A - page 8
R7426A,B,C TEMPERATURE CONTROLLER WI TH AND WITHOUT REAL TIME CLOCK EN1B-0203GE51 R0507C 8 Summer / Winter Time Change AddHour / SubHour (C.16 / C.17) These configuration parameters are only available on controllers with R TC. The configuration parameter A ddHour or SubHour are required to adjust the month for summer/winter time change or vice vers ...
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Honeywell R7426A - page 9
R7426A,B,C TEMPERATURE CONTROLLER WITH AND WITHOUT REAL TIME CLOCK 9 EN1B-0203GE51 R0507C limit or cascade sensor (T2) to operate the output device from full open (100%) to full closed (0%) or vice versa. Xp1 is the throttling range fo r the main control loop, Xp2 is used if limitation or cascade c ontrol (submaster control loop) is active (see T a ...
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Honeywell R7426A - page 10
R7426A,B,C TEMPERATURE CONTROLLER WI TH AND WITHOUT REAL TIME CLOCK EN1B-0203GE51 R0507C 10 Setting Guidelines for Reset Time of P+I Control The reset time tr should be adjusted to 2...3 times of the response time T u , which is the time interval betw een the beginning of a sustained disturbance (e.g. rapid step change of valve position) and the in ...
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Honeywell R7426A - page 11
R7426A,B,C TEMPERATURE CONTROLLER WITH AND WITHOUT REAL TIME CLOCK 11 EN1B-0203GE51 R0507C Y (% ) 100 T ( ) ° C SOFFS SOFFS CTRPH CTRPC Xph Xpc OCCUPIED UNOCCUPIED Fig. 5. Night cycle NightLow and NightHigh The night cycle program autom atically cycles betw een the user selected upper and lower limit s and turns on full heating or cooling with for ...
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Honeywell R7426A - page 12
R7426A,B,C TEMPERATURE CONTROLLER WI TH AND WITHOUT REAL TIME CLOCK EN1B-0203GE51 R0507C 12 Changing Operating Modes Fig. 7 shows the six operati ng 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 r eal-time clock the ...
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Honeywell R7426A - page 13
R7426A,B,C TEMPERATURE CONTROLLER WITH AND WITHOUT REAL-TIME CLOCK 13 EN1B-0203GE51 R0507C Time Out After approximately 10 min of inactivity (no button has been pressed: time out), each m ode returns automatically to standard display mode. Input s that have not been confirmed by the SET button are ignored by the controller and old parameter values ...
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Honeywell R7426A - page 14
R7426A,B,C TEMPERATURE CONTROLLER WI TH AND WITHOUT REAL-TIME CLOCK EN1B-0203GE51 R0507C 14 Displaying Actual Values In the standard display mode, one of nine actual values, the actual time, or the date can be selected and displayed by pushing the SEL button. The icons of the permanently displayed controller mode are described in the following t ab ...
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Honeywell R7426A - page 15
R7426A,B,C TEMPERATURE CONTROLLER WITH AND WITHOUT REAL-TIME CLOCK 15 EN1B-0203GE51 R0507C • T o release the manual override (fixed) of the output, select the output, enter output adj ustment mode and push the + and - button simultaneously . Pushing the SEL button leads back to standard display mode. R7426B AND R7426C, ONL Y WITHOUT : CONTROL LOO ...
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Honeywell R7426A - page 16
R7426A,B,C TEMPERATURE CONTROLLER WITH AND WITHOUT REAL-TIME CLOCK EN1B-0203GE51 R0507C 16 Using the Schedules (with RTC, only) T wo schedules, one for programming the schedule points and one for holiday programming, are available. The standard schedule is used to switch the controller mode (off, night, standby or comfort) at programmed schedule po ...
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Honeywell R7426A - page 17
R7426A,B,C TEMPERATURE CONTROLLER WITH AND WITHOUT REAL-TIME CLOCK 17 EN1B-0203GE51 R0507C Selecting Clock and Sche dules (with RTC, only) DA TE & TIME SELECTION ST ANDARD SCHEDULE SELECTION HOLIDA Y SCHEDULE SELECTION STA NDARD SCHEDULE PROGRAMMING DATE & TIME ADJUSTMENT HOLIDA Y SCHEDULE PROGRAMMING Fig. 13. Clock and schedules selection ...
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Honeywell R7426A - page 18
R7426A,B,C TEMPERATURE CONTROLLER WI TH AND WITHOUT REAL-TIME CLOCK EN1B-0203GE51 R0507C 18 Programming Holiday Schedule (with RTC, only) The holiday schedule programming is used to program each day of the year (01.01 ... 31.12.) as a holiday (day type = H1, H2 or H3) or as a normal day (day ty pe = H0 is default). Pushing the + or - button during ...
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Honeywell R7426A - page 19
R7426A,B,C TEMPERATURE CONTROLLER WITH AND WITHOUT REAL-TIME CLOCK 19 EN1B-0203GE51 R0507C NOTES (WITH RTC, ONLY) day Jan. Feb. March Ap r i l ) May June July A ugust Sept. Oct. Nov . Dec. 1 . 2 . 3 . 4 . 5 . 6. 7. 8. 9. 10. 11 . 1 2 . 1 3 . 1 4 . 1 5 . 1 6 . 1 7 . 1 8 . 1 9 . 2 0 . 2 1 . 2 2 . 2 3 . 2 4 . 2 5 . 2 6 . 2 7 . 2 8 . 29. 1) 30. 31. 1) ...
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Honeywell R7426A - page 20
R7426A,B,C TEMPERATURE CONTROLLER WI TH AND WITHOUT REAL-TIME CLOCK Manufactured for and on behalf of the Environment al and Combustion Controls Division of Honeywell Technologies Sàrl, Ecublens, Route du Bois 37, Switzerland by its Authorized Representative: Automation and Control Solutions Honeywell GmbH Böblinger Straße 17 D-71101 Schönaich ...
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