Honeywell R7426B, R7426C, R7426A User Manual

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MicroniK 200

Fig. 1. Temperature Controller

WITH AND WITHOUT REAL-TIME CLOCK

Contents

General................................................................................ 1

Before Installation Note ....................................................... 1

Mounting.............................................................................. 1

Wiring .................................................................................. 2

Power Supply and Grounding.............................................. 2

Configuration and Control Parameters ................................ 3

Configuration Settings ......................................................... 6

Parameter Settings and Adjustment .................................... 8

Operating Overview............................................................ 11

Notes (with RTC, only)....................................................... 19

HONEYWELL

R7426A,B,C

TEMPERATURE CONTROLLER

INSTALLATION & START-UP INSTRUCTIONS

GENERAL

This document provides instructions and procedures for installing and starting up the Micronik 200 R7426A,B,C controllers. No special tools are required for mounting and installation. The user interface and liquid-crystal display allow accurate and easy parameter setting and output adjustment.

BEFORE INSTALLATION NOTE

• Visually inspect equipment for shipping damage.

Report any damage to the appropriate Honeywell representative.

• Refer to job drawings for specific installation

information and mounting location.

• Verify the controllers will be adequately separated

from the main power supply, relays, or other equipment which can possibly generate electromagnetic interference.

• Verify that the ambient temperature and the humidity

at the controllers will not exceed 0...50°C (32...122°F) and 5 to 95% rh.

• Use shielded wiring in areas with high EMI.

• All wiring should be separated from power lines by at

least 150 mm (6’’).

• Do not install controllers near frequency converters

or other high-frequency sources.

MOUNTING

The controllers can be mounted in an electric cabinet or other suitable enclosure. They are suitable for back panel, DIN rail, wall, or front panel mounting. The corresponding mounting sequence, as well as dimensions and panel cut-out, are illustrated in the mounting instruction sheet EN1B-0202GE51 supplied with the controllers.

If the compensation sensor signal (T3) is received from another controller (parallel connection of compensation sensor inputs), the jumper W303 has to be cut before mounting the controller (see Fig. 2). This disconnects the sensor from the internal power supply.

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

WIRING

Screwless type, spring loaded terminals are provided on the controllers for panel and field wiring. These terminals are suitable for solid conductors as well as tinned or with multicore cable end, stranded wires up to 1.5 mm make a termination, push the wire into the terminal or insert a small screwdriver from the front of the controller into the spring-release hole and insert the wire. Check for proper connection by short pull on the wire.

Table 1.

controller to CPA/SPA potentiometer

R7426A,B,C T7412B1016

terminal 2 terminal 4 terminal 4 terminal 4

terminal 4 terminal 5 terminal 6

R7426A,B,C 43193982-001 - -

terminal 2 terminal 1 - -

terminal 4 terminal 3 - -

wiring run

from controller to all input and output devices

Terminal Connection

T7412B1057/1008 T7412C1030/1006

Table 2. Wire Dimensions

type of

wires

local standard

1.0 mm2 1.5 mm2

100 m 150 m

. To

T7412B1024 T7412B1040

terminal 5+6

length max.

W303

Fig. 2. Parallel Connection of Compensation Sensor T3

Table 3. Jumper States

jumper1) state description

closed T3 supplied by this controller

W303

Default jumper position = closed. Cut (open) jumper W303 only if the T3 input is fed from another controller (parallel connection, max. six devices). This disconnects the T3 input from the internal power supply

Wiring should be done only according to the actual job wiring diagrams or wiring diagrams shown in the mounting instruction sheet EN1B-0202GE51. The wiring to the CPA/SPA potentiometers is described in Table 1. All wiring must conform to applicable codes, ordinances, and regulations. The maximum allowed wiring length per wire size are shown in Table 2.

open

T3 supplied from another controller

POWER SUPPLY AND GROUNDING

1. Refer to job drawings and verify correct supply voltage to transformer (230 Vac) and controller (24 Vac).

2. Connect line power conductors to transformer primary. Line power must be supplied from a breaker panel with dedicated controller circuit. Do not turn the line power on until all wiring has been checked against job drawings.

3. Connect transformers 24 Vac secondary to the controller terminals 18 and 19. Connect one conductor to terminal marked 24 V∼ and the other to terminal marked 24 V⊥. If controllers are interconnected all terminals 19 must be connected to the same potential 24 V⊥ level.

4. Do not connect the secondary side of the transformer to the installation ground.

EN1B-0203GE51 R0507C 2

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

CONFIGURATION AND CONTROL PARAMETERS

The controllers R7426A,B,C include two groups of settings*) (I and II) for control and configuration parameters that are automatically selected during programming. For parameter Ctrltyp = Lo, setting I is selected, and for parameter Ctrltyp = Hi1/Hi2, setting II is selected.

config. par. R7426

no. name

description

C.01 DIR/REVY1 Selects the output action of Y1 to adapt the valve or damper direction Dir x C.02 DIR/REVY3 Selects the output action of Y3 to adapt the valve or damper direction Dir x C.03 DIR/REVY2 Selects the output action of Y2 to adapt the valve or damper direction Dir x

Dir

Direct acting output signal

Rev

Reverse acting output signal

C.04 Ctrltyp1) Control type selects the setpoint operating range and default parameter

setting I or II.

set-

operating range setting*)

pt.

0...50°C for ventilation systems (factory preset)

Hi1

0...130°C for heating systems

Hi2

0...130°C with pump ON/OFF operation

C.05 CPATYP Selects the Control Point /SetPoint Adjustment type. 0 x x x

CPA

TYP

potentiometer range

CPA/SPA range

sensor / remote setpoint unit type

numbers

0 internal CPA: ±5K internal 1 953...1053Ω CPA: ±5K T7412B1016 (Pt 1000)

2 100kΩ...0Ω CPA: ±5K

T7412B1057 / T7412C1030 (Pt 1000) T7412B1008 / T7412C1006 (NTC 20kΩ) 43193982-001

3 10...20kΩ

4 0...10kΩ CPA: ±5K

SPA: 15 ... 30°C

T7412B1024 (BALCO 500) T7412B1040 (Pt 1000)

HCW 23 (setpt wheel printed with +/- 5 K)

5 0...100kΩ SPA: 15...30°C 43193982-001

6 0...100kΩ

SPA: 0...50°C or 0...130°C

43193982-001

C.06 YRange Selects the output control range for all outputs (Y1, Y2, and Y3) 1 x

0 1 2 ... 10 Vdc

0 ... 10 Vdc

C.07 Startup Enables the start-up routine OFF x x

OFF

Disabled Enabled

C.08 Y1Mode Y1 output mode selects an individual output function for Y1 4 x x C.09 Y3Mode Y3 output mode selects an individual output function for Y3 4 x C.10 Y2Mode Y2 output mode selects an individual output function for Y2 4 x

Synchronous / floating

2 stage ON/OFF

3 stage binary coded ON/OFF

Pulse-width modulation

Unconfigured

C.11 YMode Selects the output mode for sequence operation or multistage ON/OFF func. 0

0 Damper, cooling and heating (Y1,Y2, Y3) x x

Sequence control for heating or cooling (Y1,Y2, Y3);

or 6-stage ON/OFF Sequence control for heating (Y1, Y3) and cooling (Y2);

or 4-stage ON/OFF for heating (Y1, Y3), and cooling (Y2) Sequence control for cooling (Y1, Y3) and heating (Y2);

or 4-stage ON/OFF for cooling (Y1, Y3), and heating (Y2)

4 Two-position damper control (Y1), heating (Y3) and cooling (Y2) x x 5 15-stage binary coded ON/OFF for heating (Y1, Y3), and cooling (Y2) x

Table 4. Configuration parameters R7426A,B,C

default setting

A B C

actual

value

x x x

for I

I II II

xxx

3 EN1B-0203GE51 R0507C

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

config. par. R7426

no. name

description

C.12 T2ext Enable / Disables the T1 sensor input to be used for both T1 and T2 inputs.

0 1 T2 installed

T1 signal used for T2

C.13 LimTyp Limitation type determines whether the limit function is low or high. 0 / 1

0 1 Low limit

High limit

C.14 Senstyp Sensor type determines automatic detection or manual selection of NTC

sensors.

0 1 Auto detection

NTC sensor type

C.15 Y1CTRF Controls the action of Y1 or activates the occupancy input for summer/winter

changeover.

R7426A R7426B,C 0

cooling

heating

summer/winter changeover

0 1 mixed air damper

energy recovery

C.16 AddHour2) Adjusts the month for winter/summer time change.

Min.

0 (disables winter/summer time change)

Max.

C.17 SubHour2) Adjusts the month for summer/winter time change.

Min.

C.18 PSTG_H

2) 3)

Min.

C.19 PSTG_C

2) 3)

Min.

0 (disables summer/winter time change)

Max.

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

0 (disabled)

Max.

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

0 (disabled)

Max.

C.20 tvd2) Determines the damper prestart time before scheduled comfort mode

Min.

0 (normal control)

Max.

C.21 Adapt2) Optimum Start Self Adaption speed

Min.

Max. 0 100

C.22 Adr1) Sets the serial communication address, used for service or maintenance.

Min.

Max. 0 255

C.23 DefProg Initiates the default programming.

0 1 No Default programming

Initiates Default programming

actual value will not be changed during reset to default parameter

on Controllers with Real-Time Clock, only

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)

default setting

I / II

0 x x x

0 / 1 x x x

3 x x x

(March)

10 x x x

(Oct.)

0 K/min x x x

15 min x x

50% x x x

254 x x x

0 x x x

A B C

x x x

actual

value

EN1B-0203GE51 R0507C 4

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

control par. setting I / setting II R7426

no. name

P.01 W1 Main setpoint for input T1 0

P.02 Wlim Limit setpoint (low or high) for input T2

description

low high def.

50 / 130

5 / 30

50 / 130

P.03 Wcomp Compensation changeover point for input T3 -5 40 20 1 °C x x x

P.04 Wi Winter compensation authority -350 +350 0 2 % x x x

P.05 Su Summer compensation authority -100 +100 0 1 % x x x

P.06 Wcas Submaster or cascade setpoint OFF, 0 50 20 0.5 °C x x x

P.07 Rcas Cascade reset span adjustment 0 40 10 0.5 K x x x

P.08 Xp1 Throttling range (main control loop) for T1 0.5 40 2 0.5 K x x x

P.09 Xp2

Throttling range (cascade or limit control loop) for T2

0.5 40 10 0.5 K x x x

P.10 Xpc Cooling throttling range for sequence control OFF, 1 40 3 0.5 K x x

P.11 Xph Heating throttling range for sequence control 1 40 6 0.5 K x x

P.12 tr11) Reset time (main control loop)

P.13 tr21) Reset time (cascade control loop)

OFF,

20 sec

OFF,

20 sec

min

P.14 MINPOS Minimal pos. for air damper actuators 0 50 20 1 % x x

P.15 Ystart Start point for mid range shift of output Y1 -20 +20 0 0.5 K x x x

P.16 SOFFS Offset of main setpoint in Standby mode 0 10 2 0.1 K x x x

P.17 T1Cal Calibration of temperature sensor T1 -20 +20 0 0.1 K x x x

P.18 T2Cal Calibration of temperature sensor T2 -20 +20 0 0.1 K x x x

P.19 T3Cal Calibration of temperature sensor T3 -20 +20 0 0.1 K x x x

P.20 RetOffs Return air offset to simulate exhaust air cond. OFF, 0 5 OFF 0.1 K x x

P.21 RuntimeY1 Actuator run time for Y1 6 180 60 1 sec x x

P.22 RuntimeY3 Actuator run time for Y3 6 180 60 1 sec x

P.23 RuntimeY2 Actuator run time for Y2 6 180 60 1 sec x

P.24 NightLow2) Night low limit against temperature extremes OFF, 8 19 OFF 1 °C x x x

P.25 NightHigh2) Night high limit against temperature extremes OFF, 21 40 OFF 1 °C x x x

P.26 NOFFS2) Offset of main setpoint in Night mode 0 30 5 0.1 K x x x

for tr > 2 min ⇒ resolution = 0.5 min, for tr < 2 min ⇒ resolution = 10 sec

on Controllers with Real-Time Clock, only

For detailed information of control parameters see chapter Parameter Settings and Adjustment.

Table 5. Control parameters R7426A,B,C

21 /

16 /

OFF

reso-

lution

unit

A B C

actual

value

0.5 °C x x x

1 °C x x x

10/

sec/

0.5

10/

0.5

x x x

min

sec/

x x x

min

5 EN1B-0203GE51 R0507C

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 (W submaster temperature (W 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 Hito 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.

) are selected for air tem-

cas

), and

lim

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).

CPATYP

CPAT YP 0

CPAT YP 1 (953...1053Ω)

CPAT YP 2 (100kΩ...0Ω)

CPAT YP 3 (10...20kΩ)

CPAT YP 4 (0...10kΩ)

CPAT YP 5 (0...100kΩ)

CPAT YP 6 (0...100kΩ)

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 configuration parameter (see Table 7).

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

Table 6. Selection of CPA/SPA Type

CPA / S PA

range

CPA: ±5 K

SPA: 15 ... 30°C

CPA: ±5 K

SPA:

15...30°C

SPA: 0...50°C or 0...130°C

Table 7. Individual Output Function Selection

output function

internal

T7412B1016 (Pt 1000)

T7412B1057 (Pt 1000) T7412C1030 (Pt 1000) T7412B1008 (NTC 20kΩ) T7412C1006 (NTC 20kΩ) 43193982-001

T7412B1024 (BALCO 500) T7412B1040 (Pt 1000)

HCW 23 (setpoint wheel printed with +/- 5 K)

43193982-001

sensor /

remote setpoint unit type

YxMode

(x = 1, 2 or 3)

EN1B-0203GE51 R0507C 6

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

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 configured for the following control applications by the control parameters YMode and Y1CTRF (see Table 8). Sequence control will be activated if at least one control parameter YxMode is not equal 4 (R7426B, only).

Table 8. Sequence Operation Selection

sequence control YMode

for cooling with three outputs (Y1, Y2, Y3)

for heating with three outputs (Y1, Y2, Y3)

with two outputs (Y1, Y3) for heating and one output for cooling (Y2)

with one output (Y2) for heating and two outputs for cooling (Y1, Y3)

damper, cooling and heating (Y1, Y2 and Y3)

energy recovery, cooling and heating

1 0 0

1 1 0

2 n.a. 0

3 n.a. 0

0 0 0

0 1 0

Multistage ON/OFF Function

In the case of the three floating output controller R7426B, several ON/OFF sequence control functions can be selected by the configuration parameter YMode (see Table 9).

Table 9. Multistage Selection

output function

6-stage ON/OFF sequence control

4-stage ON/OFF sequence control heating

4-stage ON/OFF sequence control cooling

15-stage binary coded ON/OFF sequence control H.

two-position damper control

individual (cooling and heating)

In the case of the R7426B,C controller, the output Y1 can be configured for two-position damper control by setting the configuration parameter YMode to 4.

YMode

5 n.a. Y1,Y3

4 n.a. Y1

YxMode

4 (x=1, 2, and 3)

4 (x=1 and 3)

Y1CTRF YxMode

provided

output

Y1,Y2,Y3 n.a.

Y1,Y3

function

of Y2

according to Y2Mode

Y2 and Y3

Supply of Temperature Signal T2 T2ext (C.12)

If sensor T1 is used also for high or low limit control, the configuration parameter T2ext must be set to 1. This interconnects the T1 and T2 input internally and the sensor has to be connected only to the T1 input.

By using a limit temperate sensor T2, the parameter T2ext has to be set to 0 (default).

Limit Type LimTyp (C.13)

The configuration parameter LimTyp allows the selection of high or low limit control. High limit control is performed if configuration parameter LimTyp = 1; low limit control is performed if configuration parameter LimTyp = 0.

Sensor Type Senstyp (C.14)

Three different sensor types can be used with the controller (see Table 10).

Table 10. Sensor Types

automatic ID

of sensor type

Pt 1000 BALCO 500

NTC 20kΩ

1) NTC sensor is detected automatically if, during power-

up, the sensor temperature is within -30....+85°C and the

configuration parameter Senstyp = 0. NTC sensor is selected manually if the configuration parameter Senstyp is set to 1.

Automatic identification of sensor type is selected if the configuration parameter Senstyp = 0 (default). After power up reset, the controller detects automatically the type of sensor connected to the main temperature input T1. For correct auto detection, it is necessary that the measured temperature be in the specified range (see Table 10). The same type of sensor must be used for all temperature inputs (T1, T2 and T3).

temperature

range

-30....+130°C 1000Ω at 0°C

-30....+130°C 500Ω at 23.3°C

-30....+85°C /

-30....+130°C

characteristics

20kΩ at 25°C

Output Control Function Y1CTRF (C.15)

The R7426A controller performs cooling control if the configuration parameter Y1CTRF is set to 0. A rise in the measured variable will increase the output value (direct acting). The control action must be reversed for heating control by setting the control parameter Y1CTRF to 1. A rise in the measured variable will decrease the output value.

If the configuration parameter is set to 2, the R7426A controller provides summer/winter changeover control by a potential-free contact connected to the occupancy input (terminals 1 and 4).

In the case of the R7426B,C controller, the configuration parameter Y1CTRF has to be set to 0 (default) to perform mixed air damper control and to 1 for energy recovery systems.

7 EN1B-0203GE51 R0507C

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

Summer / Winter Time Change AddHour / SubHour (C.16 / C.17)

These configuration parameters are only available on controllers with RTC. The configuration parameter AddHour or SubHour are required to adjust the month for summer/winter time change or vice versa.

The actual clock is incremented by one hour at 2:00 on the last sunday of the month for winter/summer time change (AddHour). The actual clock is decremented by one hour at 2:00 on the last sunday of the month for summer/ winter time change (SubHour).

Prestart Gradients PSTG_H / PSTG_C (C.18 / C.19)

The configuration parameter PSTG_H or PSTG_C are necessary for the optimum start program on controllers with RTC. For heating and cooling applications, these parameters determine the prestart gradient to reach the comfort setpoint at occupancy start.

If the comfort setpoint will be reached earlier or later than expected, the controller corrects the prestart gradient by selfadaption routine to optimize the start cycle.

The optimum start cycle for heating or cooling can be disabled by setting PSTG_H or PSTG_C to 0.

Optimum Start Self Adaption Speed Adapt (C.21: Controller with RTC only)

This parameter is used by the self-adaption routine to optimize the energy consumption during the start cycle. For this optimization, a corrected prestart gradient is calculated once per day. The adaption to the actual prestart gradient for the next optimum start cycle is determined by the self adaption speed Adapt (0% = adaption disabled and 100% = max. adaption speed).

Damper Prestart Time tvd (C.20: Controller with RTC only)

The damper prestart time tvd is active with the optimum start program only and is used to set the time before occupancy start (scheduled comfort mode) at which the output signal Y1 (damper) switches to normal operation to supply fresh air to the space in mixed air applications.

Serial Communication Address Adr (C.22)

The configuration parameter Adr sets the serial communication address.

The serial communication bus allows the connection of the PC-based Operator’s Terminal to one or several controllers. It provides access to all application configuration and control parameters, time schedules, input and output values of the connected controllers and easy setting of these via the bus by mouse click or keyboard.

Default Programming DefProg (C.23)

Setting the control parameter DefProg to 1 resets all control and configuration parameters to defaults (see Table 4 and Table 5). Default programming is indicated by a display of def.

After default programming, the parameter DefProg is reset to

PARAMETER SETTINGS AND ADJUSTMENT

Main Setpoint W1 (P.01)

The main setpoint is either set by the control parameter W1 or by the external setpoint potentiometer if the configuration parameter CPATYP = 3, 5 or 6.

High/Low Limit Setpoint W

For high or low limit control, the control parameter W used as setpoint.

During limit control, the throttling range Xp2 and reset time tr2 are active.

Limit control will be active only if the T2 temperature signal (control parameter T2ext = 0) is available or alternatively the sensor T1 (control parameter T2ext = 1) is used also for limit control.

For cascade control, the limit setpoint W control point at which the submaster setpoint the limit value and is not shifted anymore by the master control loop.

High or low limit control is in accordance with the configuration parameter LimTyp (C.13).

Submaster Setpoint W

The R7426A,B,C controllers provide cascade control which uses two control loops, master and submaster to maintain the master setpoint CTRP1. Cascade control will be active if temperature sensor T2 is connected and the control parameter W

This adjustment sets the control point of the submaster control loop, discharge temperature (T2), at zero room temperature deviation. If the room temperature deviates, the submaster setpoint W

Cascade control is disabled if the submaster setpoint W set to OFF.

Low limit of CTRP2 is performed if control parameter LimTyp = 0 and high limit of CTRP2 is performed if control parameter LimTyp = 1.

is set to any value other than OFF.

cas

is automatically altered.

Reset Span Adjustment R

The reset span adjustment R Kelvin. The submaster setpoint W perature (T1) deviates by 50% of the throttling range Xp1.

determines the reset effect in

cas

Throttling Range Xp1 / Xp2 (P.08 / P09)

Proportional band (throttling range Xp) adjustment determines the temperature change, required at the main sensor (T1) and

(P.02)

lim

determines the

lim

cas

(P.06)

(P.07)

cas

is altered if the tem-

cas

lim

) maintains

cas

EN1B-0203GE51 R0507C 8

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

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 for the main control loop, Xp2 is used if limitation or cascade control (submaster control loop) is active (see Table 11).

Table 11. Throttling range and reset time reference

application sens.

Xp1 Xp2 Xpc Xph

tr1 tr2

R7426A Controller Main Temp.Control T1 x x High or Low Limit

Temperature Control

T2 x x

Cascade Control Master T1 x x Submaster T2 x x

Setting Guidelines for Proportional Band of P and P+I Control

To estimate the proportional band (throttling range Xp) for stable control under all different load conditions, the control or correcting range X known. This is the maximum air temperature increase produced by the heating coil or decrease of a cooling coil if the control valve is fully open.

The proportional band X calculated by using the following rule-of thumb formula:

For room temperature control, the following rule-of-thumb formula can be used:

R7426B,C Controller Main Temp. Seq. Control Mixed Air Damper T1 x x Energy Recovery T1 x x

The ∆t trol is the maximum difference between outdoor air (OA) temperature and return air (RA) temperature.

(Xh) of the discharge air for mixed air damper con-

max

Heating T1 x x Cooling T1 x x

R7426B,C Controller Temperature Cascade

Sequence Control

The often-specified accuracy for room control of ±1 (X allows a discharge air alteration of 20 °C.

In P+I control the same proportional band can be used as for P control. The following rule-of-thumb formulae are used for P+I control:

Master T1 x x Submaster

• Discharge air control

- Mixed Air Dampers T2 x x

- Energy Recovery T2 x x

- Heating T2 x x

- Cooling T2 x x

Throttling Range Xpc / Xph (P.10 / P11)

The control parameters Xpc and Xph are only available on R7426B,C controllers and are used to set the cooling and

• Room control

Reset Time tr1 / tr2 (P.12 / P13)

heating throttling ranges for the following applications

• Temperature sequence control with heating, mixed air dampers, and cooling (see Fig. 3 and Table 11)

• Temperature cascade control with heating, mixed air dampers, and cooling (see Table 11)

In applications without cooling, the throttling range Xpc must be set to OFF 100% fresh air supply at actual temperature above the control point is required (outdoor and return air dampers fully open).

Y[%]

100

MINPOS

Heating

Xph

Damper

CTRPH

1/4 Xp1 if Xpc = Off

Cooling

Xp1

CTRPC

Xpc

CTRP1

if Xpc = Off

Xwh / Xwc

Xwd

Fig. 3. Temperature sequence control with heating, mixed

air dampers, and cooling valve

In the case of combined action including proportional and integral components (P+I control), the reset time (tr) is defined as the required time after which the integral part is equal to the change due to the proportional action for a predetermined step change in the input variable. See Fig. 4.

The control parameter tr1 sets the reset time of the P+I main temperature control loop. For limit or submaster cascade control the control parameter tr2 sets the reset time of these control loops, e.g. discharge temperature T2 (see Table 11).

Fig. 4. Step change response of P+I control

If only proportional control is required, parameter tr must be set to OFF.

of the heating or cooling coil must be

for discharge air control can be

Xp=

= ϑRA - ϑ

Xp=

100

P =

Xp=

810...

∆t discharge air

max

OAmin

45...

∆t discharge air

max

Xp=

8 ... 10

%/s

= 2K)

9 EN1B-0203GE51 R0507C

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

Setting Guidelines for Reset Time of P+I Control

The reset time tr should be adjusted to 2...3 times of the response time Tu , which is the time interval between the beginning of a sustained disturbance (e.g. rapid step change of valve position) and the instant when the resulting change in the output signal reaches a specified fraction of its final steady-state value, either before overshoot or in the absence of overshoot.

The response time T

in discharge air control is normally in

the range of 0.1 to 0.6 min, which allows adjustments of the reset time tr in a range of 0.2 to 2 min.

In room control the response time T

is in the range of

0.5 to 5 min, which results in a setting of 1 to 15 min.

Start Point Y

start

(P.15)

This control parameter is available only on the single output controller R7426A and on the R7426B controller if the three 3position floating outputs are configured for 6-stage ON/OFF sequence control and on the R7426B,C controllers if YMode = 1 is selected.

The start point determines the midrange shift of the output Y1 from the calculated control point.

The start point is calibrated in degrees K and is the offset (plus or minus) from the set values or calculated control points at which the output Y1 is at 50%. Normally and especially in P+l control, the start point should be set at zero. A change is required only in specific applications where a asymmetrical arrangement results in improved control performance, e.g. if for heat-up of a large space in the morning a high heat capacity is needed and for normal control the valve must be opened by only a small amount.

Compensation Changeover Point W

comp

(P.03)

The control parameter W summer or winter compensation. Above the compensation changeover point (W

winter compensation is performed.

comp

defines the start point of

comp

) summer compensation and below

Summer / Winter Compensation Authority Su / Wi (P.04 / P.05)

These authority settings determine the reset effect (OAT the compensation sensor (T3) has on the main setpoint W1 in percentages. Outside temperature reset in summer and winter time are commonly used applications.

To calculate winter and summer authority, the throttling range must be considered in proportional-only control according to Table 12.

Comp

)

Table 12. Calculation of summer/winter compensation

control

schedule

Winter

Summer

Compensation change-over at +20 °C outdoor air temperature

NOTE: With P+I control Xp = 0

room temp.

(T1)

C 20°C 2°C

C -15°C 2°C

Aut Wi =

Aut Su =

∆

(22 -20) + 2

C 20°C 2°C

C 35°C 2°C

(26 - 20) - 2

outdoor air

(T3/T

∆

T1 X

t Outside Air

100% 12%⋅=≈

∆∆T1 X

−

t Outside Air

100% 27%⋅=≈

temp.

)

comp

⋅=

100%

throttling

range (XP)

Occupied/Unoccupied Function SOFFS (P.16)

A potential-free contact can be used between terminals 1 and 4 to switch the controller between occupied (contact closed) or unoccupied (contact open) mode.

In occupied mode, the temperature set point W1 is used for the control point calculation. In unoccupied mode, the SOFFS parameter value is added (cooling) to or subtracted (heating) from the calculated control point.

In the case of the R7426A controller, the parameter Y1CTRF must be set to 0 or 1 (≠ Cho) to match the required heating or cooling application.

If the configuration parameter Y1CTRF is set to 2 (summer / winter changeover), the parameter SOFFS is not considered.

In sequence applications of heating and cooling, the SOFFS parameter value is added to the control point for cooling (CTRPC) and subtracted from the control point for heating (CTRPH) (see Fig. 5).

Night Mode Offset NOFFS (P.26: Controller with RTC only)

This control parameter is used to set the night mode offset. During night mode, freeze protection is active and the

occupied / unoccupied function is inactive.

Night Cycle NightLow and NightHigh (P.24 and P.25: with RTC, only)

The control parameters NightLow and NightHigh are used by the night cycle program (controller mode = OFF) to assign unoccupied night low or high limits for the protection of a space and its contents against temperature extremes.

EN1B-0203GE51 R0507C 10

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

Y (%)

100

UNOCCUPIED

OCCUPIED

SOFFS SOFFS

Xph Xpc

CTRPH CTRPC

T ( )

Fig. 5. Night cycle NightLow and NightHigh

The night cycle program automatically cycles between the user selected upper and lower limits and turns on full heating or cooling with forced return air recirculation or full energy recovery whenever the limits are reached. The switching hysteresis is fixed to 1 K.

This function can be disabled for heating and/or cooling by setting

NightLow

and/or

NightHigh

to OFF.

Calibration of Temperature Sensors T1CAL, T2CAL, or T3CAL (P.17...P.19)

The controllers include a calibration setting and are factory calibrated. In case of an offset as a result of long wiring lengths the temperature sensor inputs (T1, T2, and T3) can be adjusted separately by the control parameters

T2CAL

and

T3CAL

T1CAL

Return Air Offset RetOffs (P.20)

The control parameter controllers and is used to activate economizer mode ( ≠ OFF) for mixed air damper ( recovery system control (

If the main temperature sensor (T1) is installed in the exhaust air, the control parameter applications with the main sensor installed in the room and with a constant offset between room and exhaust air conditions, this offset value can be adjusted within 0...5 K by the control parameter actual measured room temperature value to simulate exhaust air conditions.

The economizer mode is disabled if the value of the control parameter

RetOffs

temperature sensor is connected.

RetOffs

is available only on R7426B,C

RetOffs

Y1CTRF

RetOffs

RetOffs.

Y1CTRF

This will be added to the

= 0) or energy

= 1).

should be set to 0. In

is programmed to OFF or if no outdoor air

Minimum Position MINPOS (P.14)

The control parameter adjustment R7426B,C controllers only and determines the minimum open position to which an outdoor air damper actuator can be driven from the controller. In mixed air damper applications it maintains the minimum outdoor air damper setting, even though the temperature input condition calls for a fully closed position.

MINPOS

is available on

If the controller is in OFF mode, the time schedule program overrides the minimum position by the ON/OFF input for plant/system shut off and the damper is driven into the fully closed position at OFF condition together with the heating and cooling valve actuators.

Runtimex, x = Y1, Y2, or Y3 (P.21...P.23)

The control parameters x = Y1, Y2 or Y3 for R7426B) are available only on R7426A, B controllers.

The controller converts the deviation signal to a proportional output pulse which drives the actuators depending on the

Runtimex

parameter value.

An automatic synchronization function ensures correct positioning of the actuators. The run time for synchronization is derived by control parameter

By selection of the output to pwm mode, the pulse-width modulated output is suitable for driving electric heat current valves and is controlled from the heating signal. The total cycle time is set by the control parameter

Runtimex

(x = Y1 for R7426A;

multiplied by 1.25.

Runtimex

OPERATING OVERVIEW

Display and Operation Elements

The MicroniK 200 user interface is described in Fig. 6.

NOTE:

Pushing the + or - button increments/decrements

values or scrolls through the parameter list:

• pushing one time: single step

• pushing without release: automatically inc./dec. or scroll

• after 3 sec pushing without release: fast automatically

increment/decrement or scroll

DISPLAY

FREEZE PROTECTION

*ON CONTROLLERS WITH REAL-TIME CLOCKS, ONLY.

PUSH BUTTONS

SELECTION OR ESCAPE

PARAMETER / VALUE

CONFIRMATION

TIME*

°C

MoTuWe

Th Fr Sa Su H1 H2

Fig. 6. User interface

CONTROLLER MODE

OFF NIGHT* STANDBY

Date

Off

sec

min

HOLIDAY SCHEDULE TYPES*WEEKDAYS / GROUPS*

ADJUSTMENT OR SELECTION

COMFORT

ENGINEERING UNITSLOW BATTERY*

ALUE

11 EN1B-0203GE51 R0507C

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

Changing Operating Modes

Fig. 7 shows the six operating 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 real-time clock the time or the date are displayed. The controller mode is permanently displayed by a corresponding icon (Fig. 6).

Pushing the

and - button simultaneously for approximately 1 sec causes the controller to leave the standard display mode and to enter the parameter/configuration selection mode (Fig. 9). This mode is used for application configuration and to select parameters for adjustment.

Pushing the

SET

button causes the controller to accept the selected parameter or configuration no. and to enter the adjustment mode (Fig. 10), which is used to adjust configuration / parameter values. After adjustment, the controller returns to selection mode by pushing the

SEL

the

button leads back to standard display mode.

SET

SEL

button. Pushing

AUTOMATIC

DISPLAY

POWER UP

Pushing the

SET

and

SEL

button simultaneously for approx. 1 sec causes the controller to leave the standard display mode and to enter the output data selection mode (Fig. 11).

Pushing the

SET

button causes the controller to accept the selected output data no. and to enter the output adjustment mode (Fig. 12). This mode is used for manual override of output values. The return to standard display mode is shown in Fig. 7.

Pushing the

SET

and - button simultaneously for approx. 1 sec causes the controller to leave the standard display mode and to enter the clock / schedule selection mode (Fig.

13) on controllers with real-time clock, only.

OUTPUT

ADJUSTMENT

MODE

OUTPUT

SELECTION

MODE

OUTPUT

FIXING

NO OUTPUT FIXING

RELEASE OF

OUTPUT FIXING

AND

FOR APPROX.

1 SEC

FOR APPROX.

1 SEC

FOR APPROX.

STANDARD

PARAM./CONFIG.

DISPLAY

MODE

AND

CLOCK / SCHEDULE SELECTION

Fig. 7. Operating overview

CONTROLLERS WITH

REAL-TIME

CLOCKS, ONLY.

1 SEC

SELECTION

MODE

PARAM./CONFIG.

ADJUSTMENT

MODE

NO PARAMETER VALUE CHANGE

EN1B-0203GE51 R0507C 12

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

Time Out

After approximately 10 min of inactivity (no button has been pressed: time out), each mode returns automatically to standard display mode. Inputs that have not been confirmed

by the

SET

button are ignored by the controller and old

parameter values will be retained.

ON CONTROLLERS WITH REAL-TIME CLOCK, ONLY

TIME & WEEKDAY

Date

DATE

°C

MAIN TEMPERATURE T1

MAIN SETPOINT CTRP1

LIMITATION / CASCADE TEMPERATURE T2

°C

SUBMASTER / LIMIT SETPOINT CTRP2

COMPENSATION TEMPERATURE T3

HUMIDITY DEVIATION X

Wrh

R7426B,C, ONLY

OUTPUT Y1 *)

OUTPUT Y2 *)

*) THE OUTPUT DATAS (Y1, Y2, AND Y3) ARE DISPLAYED BETWEEN THE FOLLOWING RANGES:

OUTPUT TYPE

FLOATING

0...10VDC

2...10VDC

CONTROL RANGE OUTPUT RANGE

0...100% 0...100%

0...100%

0...120% --> 0...12V (DIR)

-20...100% --> 12...0V (REV)

-25...125% --> 0...12V

Fig. 8. Standard display mode

R7426B,C, ONLY

OUTPUT Y3 *)

*) DURING THE AUTOMATIC SYNCHRONIZATION FOR A CORRECT POSITIONING OF THE ACTUATORS, IS DISPLAYED TOGETHER WITH THE CORRESPONDING OUTPUT NUMBER.

Syn

13 EN1B-0203GE51 R0507C

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

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 table:

Table 13. Icons

controller mode / status display

Off OFF - icon

Night1) Moon - icon

Standby Halfsun - icon

Comfort Sun - icon

Freeze Protection Alarm and Operation

Low battery

1) 2) 3)

Battery icon

Optimum Start 1)

On controllers with real-time clock, only.

Status information is displayed together with actual icon

for the controller mode.

In order to improve battery lifetime, low battery detection

Freeze protection icon in addition

Sun icon is flashing ≈ 1Hz

is performed only once a day and after power up.

If a displayed date is programmed to be a holiday, the corresponding holiday icon is displayed on controllers with real-time clock.

Selecting Parameters

The parameter/configuration selection mode is used to select control and configuration parameters (Fig. 9) for adjustment. The displayed parameter no. corresponds with the number in Table 4 and Table 5. Default programming is indicated by a display of def.

Pushing the Pushing the

or - button scrolls through the parameter list.

SET

button enters the adjustment mode.

Adjusting Configuration / Parameter Values

The adjustment mode is used to adjust configuration and parameter values (Fig. 10). In this mode, the selected parameter no. is displayed and the corresponding value flashes.

Pushing the

or - button increments or decrements the value of the selected parameter. Ranges are shown in Table 4 and Table 5. An adjustment example is shown in Fig. 18.

Pushing the Pushing the

SEL

button retains the old parameter value.

SET

button accepts the parameter value and

returns to parameter/configuration selection mode.

Resetting Param. Values to Default Values

Pushing simultaneously the + and - button during the power up or setting the control parameter

DefProg

control and configuration parameters to defaults (see Table 4 and Table 5). Default programming is indicated by a display of def.

to 1 resets all

°C

FIRST DISPLAYED CONFIGURATION PARAMETER:

NOTE: CONTROL OR CONFIGURATION PARAMETERS WHICH ARE NOT AVAILABLE ON THE GIVEN CONTROLLER VERSION ARE SKIPPED.

FOR R7426C

FOR R7426A,B

CTUAL

PAR AME TER

VALU E

Fig. 9. Parameter/Configuration Selection Mode

TO ADJUST

PARAMETER

VALU E

°C

Fig. 10. Parameter/Configuration Adjustment Mode

Selecting Output Values

The output selection mode is used to select the output no. (see Fig. 11) for manual override adjustment. An activated manual override is indicated by a displayed

Pushing the Pushing the

or - button scrolls through the output list.

SET

button enters the adjustment mode.

F (fixed).

Manually Overriding Output Values

The output adjustment mode is used for manual override adjustment of output values (see Fig. 12). In this mode, the selected output no. is displayed and the actual output value flashes.

Pushing the of the selected output for manual override purpose. The output range is displayed in correspondence with the nominal control range.

To return to output selection mode, three options are available:

• Pushing the manual override (fixing) of output value.

• Pushing the still determined by the control loop (no fixing).

or - button increments or decrements the value

SET

-button after adjustment activates the

SEL

button, causes that the output value is

EN1B-0203GE51 R0507C 14

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

• To release the manual override (fixed) of the output, select

the output, enter output adjustment mode and push the +

button simultaneously.

and

Pushing the

SEL

button leads back to standard display mode.

WITH :

MANUAL OVERRIDE

IS ACTIVE

R7426B

AND

R7426C,

ONLY

WITHOUT :

CONTROL LOOP IS ACTIVE

Fig. 11. Output Selection Mode

% %

TO ADJUST

OUTPUT

VALU E

% %

OUTPUT

SELECTION

OUTPUT

VALU E

ADJUSTMENT

NO MANUAL OVERRIDEMANUAL OVERRIDE

AND

RELEASE OF

MANUAL OVERRIDE

Fig. 12. Output value adjustment for manual override

OUTPUT

SELECTION

OUTPUT

VALU E

DJUSTMENT

AUTOMATIC

DISPLAY

FOR APPROX.

1 SEC

OUTPUT

SELECTION

15 EN1B-0203GE51 R0507C

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

Using the Schedules (with RTC, only)

Two 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 points (S1 ... S6), which can be set for each weekday or weekday group as well as for several holiday types (H1, H2 and H3).

If the comfort or standby mode is taken from the schedule and if the occupancy switch is connected, the controller mode is determined by the occupancy input as follows:

• Occupied (contact closed): Controller mode = Comfort (sun - icon)

• Unoccupied (contact open): Controller mode = Standby (halfsun - icon)

The OFF and night controller modes are not influenced by the occupancy input.

Table 14 shows an example of the weekly schedule programmed with the following default values:

• Mo ... Su from 6:00 till 18:00 = Comfort mode

• Mo ... Su from 18:00 till 6:00 = Night mode

The holiday schedule is used to program each day of the year (01.01 ... 31.12.) as a holiday (day type = H1, H2 or H3) or as

day1)

point 1 point 2 point 3 point 4 point 5 point 6

time SMode2) time SMode2) time SMode2)time SMode2)time SMode2) time SMode

Mo 6:00 comfort --:-- ignore --:-- ignore --:-- ignore --:-- ignore 18:00 night

Tu 6:00 comfort --:-- ignore --:-- ignore --:-- ignore --:-- ignore 18:00 night

We 6:00 comfort --:-- ignore --:-- ignore --:-- ignore --:-- ignore 18:00 night

Th 6:00 comfort --:-- ignore --:-- ignore --:-- ignore --:-- ignore 18:00 night

Fr 6:00 comfort --:-- ignore --:-- ignore --:-- ignore --:-- ignore 18:00 night

Sa 6:00 comfort --:-- ignore --:-- ignore --:-- ignore --:-- ignore 18:00 night

Su 6:00 comfort --:-- ignore --:-- ignore --:-- ignore --:-- ignore 18:00 night

H1 0:00 off --:-- ignore --:-- ignore --:-- ignore --:-- ignore --:-- ignore

H2 0:00 off --:-- ignore --:-- ignore --:-- ignore --:-- ignore --:-- ignore

H3 0:00 off --:-- ignore --:-- ignore --:-- ignore --:-- ignore --:-- ignore

Weekday or holiday type; 2)Programmed controller mode (schedule mode)

Table 14. Example of weekly schedule and holiday types (default)

day Jan. Feb. March April May June July August Sept. Oct. Nov. Dec.

1. H0 H0 H0 H0 H3 H0 H0 H0 H0 H0 H0 H0

2. H0 H0 H0 H0 H0 H0 H1 H0 H0 H0 H0 H0

3. H0 H0 H0 H0 H0 H0 H1 H0 H0 H0 H0 H0

4. H0 H0 H0 H0 H0 H0 H1 H0 H0 H0 H0 H0

28. H0 H0 H0 H0 H0 H0 H1 H0 H0 H0 H0 H0

29. H0 H01) H0 H0 H0 H0 H0 H0 H0 H0 H0 H0

30. H0 H0 H0 H0 H0 H0 H0 H0 H0 H0 H0

31. H0 H0 H0 H0 H0 H0 H0

If the 29th of February is programmed to be a H1 or H2 holiday and the current year is not a leap year, this holiday will be

deleted on March 1.

Table 15. Example of annual schedule (no default)

a normal day (day type = H0 is default). The function is described as follows:

• H0: no holiday - the weekday schedule applies

• H1: free programmable as for a weekday, but only valid for

the current day.

• H2: as H1 function - free programmable, additional holiday type, e.g. last or first day after a longer holiday period.

NOTE:

After day is passed, day type (H1 or H2) is reset at

24:00 to normal.

• H3: free programmable as for a weekday, but is valid every year and repeated annually.

The schedule points of the used holiday types (H1, H2 or H3) must be programmed in the standard schedule. Table 15 shows a programmed example of the holiday schedule (2.7. till 28.7. = holiday type H1 and 1.5. = holiday type H3).

The H1 and H2 holidays will not be influenced if the user changes the actual date. If power supply is interrupted for more than one day, all H1 and H2 holidays within the date of power supply error and the actual date will be deleted.

EN1B-0203GE51 R0507C 16

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

Selecting Clock and Schedules (with RTC, only)

DATE & TIME

SELECTION

STANDARD SCHEDULE SELECTION

HOLIDAY SCHEDULE SELECTION

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.

DATE & TIME

ADJUSTMENT

STANDARD SCHEDULE

PROGRAMMING

HOLIDAY

SCHEDULE

PROGRAMMING

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 automatically and need not be programmed. The 29th of February is adjustable only for leap years.

Pushing the ignoring adjustments which have not been confirmed by the

SET

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

button.

SEL

button returns to the selection mode,

--.--. -- / --:--

on the LCD. In this

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

Pushing the ignoring adjustments which have not been confirmed by the

SET

button.

and - button simultaneously.

SEL

button returns to the selection mode,

TO SELECT

WEEKDAY,

WEEK GROUPS,

OR HOLIDAY

TYPES

TO ADJUST SCHEDULE

POINT

TO ADJUST SWITCHING

TIME

TO ADJUST

TIME ADJUSTMENTDATE ADJUSTMENT

HOURS

TO ADJUST

MINUTES

TO ADJUST

CONTROLLER

MODE

Fig. 15. Standard schedule programming

TO ADJUST

YEAR

TO ADJUST

MONTH

TO ADJUST

DAY

Date

Fig. 14. Date and time adjustment mode

17 EN1B-0203GE51 R0507C

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

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 type = H0 is default).

Pushing the programming (see Fig. 16) toggles between all programmed holidays (≠ H0) and displays them (type and date).

If none of the 365 days of a year is programmed to be a holiday, the actual date is displayed, marked as normal day (H0).

Pushing the enters the adjustment for date and day type.

To program a new holiday, select any holiday, adjust date (and holiday type if necessary) and confirm the changes by pushing the type H0 has to be set for the specific day.

Pushing the ignoring adjustments which have not been confirmed by the

SET

button.

or - button during the first step of the holiday

SET

button selects the displayed holiday and

SET

button. To reset a holiday to normal day, day

SEL

button returns to the selection mode,

TOGGLE/DISPLAY

PROGRAMMED

HOLIDAY

TO ADJUST

MONTH

TO ADJUST

DAY

TO ADJUST DAY TYPE (H0, H1, H2, OR H3)

Fig. 16. Holiday schedule programming

Interpreting Error Messages

Different analog input errors can be identified by the controller (Error handling). The defective analog input (T1, T2, T3 or X

) will be displayed in the standard display mode (see Fig.

wrh

17) after the corresponding value is selected.

NOTE:

For the external CPA/SPA potentiometer input, no

error message is indicated if the potentiometer or wiring is defective. In this case, for control point or setpoint calculation, the following values are used:

• for CPATYP 0, 1 or 2 ⇒ CPA value = 0

• fo r C PAT Y P 3 ⇒ SPA value = control parameter W1

DISPLAY SHOWN IF NO SENSOR

IS CONNECTED DURING POWER-UP

STANDARD

DISPLAY

AND : MAIN TEMPE RATURE SENSOR T1 IS DEFECTIVE

AND

ANDSPACE

STANDARD

DISPLAY

MODE

PARA MET ER

SELECTION

MODE

THIS EXAMPLE DESCRIBES THE ADJUSTMENT OF THE COMPENSATION CHANGEOVER POINT W (P03).

°C %rh °C %rh

: LIMITATION OR CASCADE TEMPERATURE SENSOR T2 IS DEFECTIVE

: COMPENSATION TEMPERATURE SENSOR T3 IS DEFECT IVE

: ERROR OF HUMIDITY DEVIATION INPUT X

Fig. 17. Error handling

PUSH

°C

°C °C

°C

SIMULTANEOUSLY

FOR APPROX.

2 SEC

B A

comp

Fig. 18. Adjustment example

DISPLAY SHOWN AFTER ERROR

IDENTIFICATION DURING OPERATION

Wrh

TEMPERATURE DISPLAY IN °C

HUMIDITY DEVIATION DISPLAY IN % rh

PAR AME TER

ADJUSTMENT

MODE

PARA MET ER

SELECTION

MODE

°C

STANDARD

DISPLAY

PUSH UNTIL

NEEDED

VALU E IS

DISPLAYED

EN1B-0203GE51 R0507C

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

NOTES (WITH RTC, ONLY)

day Jan. Feb. March April) May June July August Sept. Oct. Nov. Dec.

10.

11.

12.

13.

14.

15.

16.

17.

18.

19.

20.

21.

22.

23.

24.

25.

26.

27.

28.

29.

30.

31.

If the 29th of February is programmed to be a H1 or H2 holiday and the current year is not a leap year, this holiday will be

deleted on March 1.

Table 16. Annual schedule

19 EN1B-0203GE51 R0507C

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

day1)

Weekday or holiday type; 2)Programmed controller mode (schedule mode)

point 1 point 2 point 3 point 4 point 5 point 6

time SMode2) time SMode2) time SMode

time SMode2)time SMode2) time SMode

Table 17. Weekly schedule and holiday types

Manufactured for and on behalf of the Environmental 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 Phone: (49) 7031 63701 Fax: (49) 7031 637493 http://europe.hbc.honeywell.com

Subject to change without notice. Printed in Germany Manufacturing location certified to EN1B-0203GE51 R0507C

Honeywell R7426B, R7426C, R7426A User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual