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PRODUCT DATA

63-2564-1

® U.S. Registered Trademark
Copyright © 2002 Honeywell • All Rights Reserved

R7426A,B,C

Temperature Controller

WITH REAL TIME CLOCK

APPLICATION

R7426A,B,C Temperature Controllers use direct digital control

technology to provide more accurate and efficient operation of
heating, ventilation and air conditioning (HVAC) systems.

Parameters are preset for plug and play operation and provide

different control strategies for optimum system performance.
The controller performs proportional or proportional plus

integral (P+I) control and covers all space, supply air or water

flow applications within the specified ranges of 32°F to 130°F
or 32°F to 260°F. Standard Pt 1000 or NTC 20K ohm

temperature sensors can be used.

The modern design with its easy to operate user interface and

LCD allows complete flexibility of control system design,

accurate parameter setting, and display of actual temperature
values, setpoints and outputs.

FEATURES

• Models with selectable floating output functions:

— Floating.
— 2, 3, 4, or 6 stage.

• Models with analog outputs 0/2 to 10 Vdc selectable.
• Space/supply limit or cascade control.
• Sequence control of heating, mixed air damper,

economizer, or energy recovery system and cooling.

• Weekly time schedule with up to 6 switching points per

day.

• Automatic daylight saving time change.
• Four different operating modes: Occupied,

Unoccupied, Night, and Off.

• Yearly advance holiday programming.
• Three types of holiday schedules.
• Self-adaptive optimum start program for room control

system.

• Night-cycle program.
• Selectable control: proportional (P) or

proportional plus integral (P+I).

• Pre-programmed control parameters.
• Digital parameter setting.
• Selectable direct/reverse acting analog output.
• 24 Vac power supply.
• 3 inputs for temperature sensors.
• Automatic sensor type identification of Pt 1000

or NTC 20K ohm.

• 2 digital inputs, occupancy (alternatively summer/

winter changeover) and freeze protection.

• Start-up routine.

Contents

Application ........................................................................

Features ...........................................................................

Specifications ...................................................................

Ordering Information ........................................................

Installation ........................................................................

Introduction .......................................................................

Operation ..........................................................................

Keypad Operation ............................................................ 10
Schedules ......................................................................... 12

Troubleshooting ................................................................ 13
Appendix A ....................................................................... 14

Control and Configuration Parameters ........................ 14

Parameter Details ........................................................ 16

Appendix B ....................................................................... 20

Programming Charts ................................................... 20

Содержание R7426A

Страница 1: ...Floating 2 3 4 or 6 stage Models with analog outputs 0 2 to 10 Vdc selectable Space supply limit or cascade control Sequence control of heating mixed air damper economizer or energy recovery system and cooling Weekly time schedule with up to 6 switching points per day Automatic daylight saving time change Four different operating modes Occupied Unoccupied Night and Off Yearly advance holiday progr...

Страница 2: ... Wiring Run from Controller to All Devices 18 AWG 328 ft 100m 16 AWG 492 ft 150m Offset Due to Wire Resistance See Table 1 Ambient Ratings Temperature Operating 32 F to 122 F 0 C to 50 C Storage 31 F to 158 F 35 C to 70 C Humidity 5 to 95 relative humidity non condensing Control Point Adjustment CPA Setpoint Adjustment SPA Input See Accessories and Table 2 Control ranges 32 F to 130 F 32 F to 260 ...

Страница 3: ...e the controller from the baseplate a Insert a flat head screwdriver into the slot at the right side of the control face b Pull the right side of the control slightly away from the baseplate c Insert a flat head screwdriver into the slot at the left side of the control face d Pull the controller away from the baseplate 3 Mount the baseplate to the surface 4 Replace the controller on the baseplate ...

Страница 4: ...NSATION SENSOR IO2 O1 IO3 HONEYWELL SERIES 61 ACTUATOR 25 15 16 17 18 19 20 21 22 23 24 26 27 28 R7426B M21039A 3 2 11 1 2 3 4 5 6 7 8 9 10 12 OFF ON 13 14 1 2 3 4 POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED TERMINALS 9 AND 10 ARE THE 24V DIGITAL FAN PUMP OUTPUT TERMINALS 13 AND 14 ARE A SERIAL INTERFACE FOR A PANEL BUS SPRING RETURN ACTUATORS ONLY T ERMINAL CONNECTIO...

Страница 5: ...d through the control and configuration parameters one at a time see Tables 13 and 14 An explanation for each follows these tables 3 Read through the Operation section referencing the wiring diagrams and parameter tables as needed OPERATION R7426A Main Temperature Control The controller compares the main sensor temperature measured I01 with the calculated setpoint CTRP1 to generate an internal dev...

Страница 6: ...e the parameter Xpc can be set to Off and damper output is maintained at 100 percent above control point CTRP1 see Fig 8 If damper output should be reduced to MINPOS level above CTRP1 see Fig 8 and if no cooling actuator is available parameter Xpc must be adjusted to a value between 2 F and 72 F CAUTION Equipment Damage Hazard Can damage the controller beyond repair Keep floating output load below...

Страница 7: ...nditions of outside air with return air the O1 output on the three output controller operates using Mixed Air Dampers or an Energy Recovery System Economizer Mixed Air Damper Mode Economizer mixed air damper mode is active when RetOffs is not Off O1CTRF is 0 NOTE See Table 3 for control logic and Fig 9 for sequence output operation Table 3 Economizer Mixed Air Damper Mode NOTE A fixed hysteresis o...

Страница 8: ...nst temperature extremes It automatically cycles between user selected upper and lower limits and turns on full heating or cooling whenever a limit is reached Output Functions The controller provides a choice of output signals suitable for operating a range of final control devices Suitability is based on the parameter setting of OMode and OxMode where x is 1 2 or 3 parameters R7426A and R7426B Th...

Страница 9: ...ed from the heating signal and O2 is controlled from the cooling signal When OMode is 3 the output sequence of O3 O1 is controlled from the cooling signal and O2 is controlled from the heating signal NOTES Mixed air damper operation is not available Output O2 operates in accordance with O2Mode O1Mode and O3Mode are 4 Fig 14 4 stage on off electric heating or cooling 6 STAGE ON OFF SEQUENCE CONTROL...

Страница 10: ...f Output Operation a Controller has an adjustable delay time before switching on b Exception On Off output will switch to On if NightHigh or NightLow limits are reached Adjustments Control Point Setpoint Adjustment CPATYP The control or setpoint can be adjusted using an internal or external potentiometer connected to the CPA SPA input see Technical Data The CPA SPA type is selected by the control ...

Страница 11: ... old parameter values retained Fig 19 Operating Overview Output Manual Override Mode Output selection mode displays the output value and indicates manual overrides An activated manual override is indicated by a displayed F fixed Use this mode for manual override It is especially useful during installation and setup 1 Press and hold the SET and SEL buttons to display output data selection mode 2 Pr...

Страница 12: ... be assigned to each date of the year 01 01 January 1 to 12 31 December 31 NOTE Schedule times and modes of utilized holiday types H1 H2 or H3 must be programmed in the standard schedule Table 10 Holiday Schedule Types a H2 is typically used to preheat or precool the space before the first occupied day NOTES H0 indicates absence of holiday and the weekday schedule applies H1 and H2 holidays are no...

Страница 13: ...mmed NOTE If no holidays have been programmed the display will show H0 and today s date 3 Press SET to change an existing or create a new holiday 4 Adjust the month to the proper value 5 Press SET to confirm this information and advance to set the day 6 Adjust the day to the proper value 7 Press SET to confirm this information and advance to set the holiday type 8 Select the proper holiday type NO...

Страница 14: ... x P 07 Rcas Cascade reset span adjustment 0 70 20 x x x P 08 Xp1 I01 Throttling range main control loop 1 70 4 20 x x x P 09 Xp2 I02 Throttling range cascade or limit control loop 1 70 20 x x P 10 Xpc Cooling throttling range sequence control Off 1 70 6 x x P 11 Xph Heating throttling range sequence control 1 70 12 x x x P 12 tr1b Reset time main control loop c Off 20 sec 20 minutes Off 10 sec 0 ...

Страница 15: ...art up routine 0 Off 1 to 10 min 0 C 08 O1Mode x x O1 output mode selects an individual output function for O1 4 un configured C 09 O3Mode x O3 output mode selects an individual output function for O3 C 10 O2Mode x O2 output mode selects an individual output function for O2 Values for C 08 C 09 and C 10 0 Synchronous floating 2 3 stage binary coded On Off 1 2 stage On Off 3 PWM European electric c...

Страница 16: ...tes by the configuration parameter TRAMP If the controller mode changes to Off output signals O1 O2 and O3 are set to 0 percent If the Optimum Start Program is enabled the Start up Routine is disabled Control Function O1CTRF C 15 If parameter O1CTRF is 2 R7426A only output O1 action depends on occupancy input see Summer Winter Changeover Function If the parameter is set to 0 output O1 is selected ...

Страница 17: ... normal programmed value NOTE This only operates with an OAT sensor connected and the OAT is below 42 F High Low Limit Setpoint Wlim P 02 For high or low limit control parameter Wlim is the setpoint During limit control the throttling range Xp2 and reset time tr2 are active Limit control is active only when I02 temperature signal I02ext is 0 is available or sensor I01 I02ext is 1 is used for limit...

Страница 18: ...p change responses of proportional and P I controls SETTING GUIDELINES FOR P I CONTROL RESET TIME Adjust reset time tr to 2 to 3 times the response time Tu NOTE Tu is the time interval between the beginning of a sustained disturbance such as a rapid step change of valve position and the instant when the resulting output signal change reaches a specified fraction of its final steady state value eit...

Страница 19: ...r installed in the room and with a constant offset between room and return air conditions this offset value can be adjusted from 0 F to 10 F using RetOffs This value is added to the measured room temperature to simulate return air conditions When RetOffs is programmed to Off or with no OAT sensor connected Economizer mode is disabled RuntimeO1 O2 O3 P 21 P 22 P 23 Parameters RuntimeO1 O2 O3 are av...

Страница 20: ...ouglas Drive North 35 Dynamic Drive Honeywell Building 1140 Brussels 480 Sawgrass Corporate Parkway Golden Valley MN 55422 Scarborough Ontario 17 Changi Business Park Central 1 Belgium Suite 200 M1V 4Z9 Singapore 486073 Sunrise FL 33325 APPENDIX B Programming Charts Table 17 Weekly and Holiday Switching Points Day Switching Point 1 Switching Point 2 Switching Point 3 Switching Point 4 Switching Po...

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