Honeywell R7426A-B-C Temperature Controller Instruction Manual

R7426A-B-C Temperature Controller

HONEYWELL

MicroniK 200

R7426A,B,C
TEMPERATURE CONTROLLER WITH AND WITHOUT REAL-TIME CLOCK
INSTALLATION & START-UP INSTRUCTIONS

Fig. 1. Temperature Controller
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

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.

Copyright © 2007 Honeywell GmbH All Rights Reserved
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EN1B-0203GE51 R0507C

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 mm2. To 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. Terminal Connection

controller to CPA/SPA potentiometer

R7426A,B,C

T7412B1016

T7412B1057/1008 T7412B1024 T7412C1030/1006 T7412B1040

terminal 2 terminal 4

terminal 4

terminal 4

terminal 4 terminal 5

terminal 6 terminal 5+6

R7426A,B,C 43193982-001

–

–

terminal 2 terminal 1

–

–

terminal 4 terminal 3

–

–

Table 2. Wire Dimensions

wiring run

type of wires

length max. 1.0 mm2 1.5 mm2

from controller to all input and output devices

local standard

100 m

150 m

W303

Fig. 2. Parallel Connection of Compensation Sensor T3

jumper1)

Table 3. Jumper States

state

description

closed

T3 supplied by this controller

W303

open

T3 supplied from another controller

1. 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.

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.

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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. no. name

description

default R7426 actual setting A B C value

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

Lo x x x

setting I or II.

for I

set- operating range

setting*)

pt.

Lo 0…50°C

for ventilation systems (factory preset)

I

Hi1 0…130°C for heating systems

II

Hi2 0…130°C with pump ON/OFF operation

II

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

0 xxx

CPA potentio- CPA/SPA TYP meter range range

sensor / remote setpoint unit type numbers

0 internal

CPA: ±5K

1 953…1053 CPA: ±5K

2 100k…0 CPA: ±5K

3

10…20k

SPA: 15 … 30°C

internal
T7412B1016 (Pt 1000)
T7412B1057 / T7412C1030 (Pt 1000) T7412B1008 / T7412C1006 (NTC 20k) 43193982-001
T7412B1024 (BALCO 500) T7412B1040 (Pt 1000)

4 0…10k CPA: ±5K

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

5 0…100k SPA: 15…30°C 43193982-001

6

0…100k

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 2 … 10 Vdc 1 0 … 10 Vdc

C.07 Startup Enables the start-up routine

OFF

xx

OFF Disabled ON Enabled

C.08 Y1Mode Y1 output mode selects an individual output function for Y1

4 xx

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

0 Synchronous / floating 1 2 stage ON/OFF 2 3 stage binary coded ON/OFF 3 Pulse-width modulation 4 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)

xx

1

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

xx x

2

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

xx x

3

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

xx x

4 Two-position damper control (Y1), heating (Y3) and cooling (Y2)

xx

5 15-stage binary coded ON/OFF for heating (Y1, Y3), and cooling (Y2)

x

Table 4. Configuration parameters R7426A,B,C

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EN1B-0203GE51 R0507C

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

config. par. no. name

description

C.12 T2ext

Enable / Disables the T1 sensor input to be used for both T1 and T2 inputs.
0 T2 installed 1 T1 signal used for T2

C.13 LimTyp

Limitation type determines whether the limit function is low or high.
0 Low limit 1 High limit

C.14 Senstyp C.15 Y1CTRF

Sensor type determines automatic detection or manual selection of NTC sensors.
0 Auto detection 1 NTC sensor type
Controls the action of Y1 or activates the occupancy input for summer/winter changeover.

R7426A

R7426B,C

0 cooling 1 heating 2 summer/winter changeover

0 mixed air damper 1 energy recovery

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

Min. 0 (disables winter/summer time change) Max. 12

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

Min. 0 (disables summer/winter time change) Max. 12

C.18 PSTG_H2) 3) Determines the prestart gradient to reach the comfort setpoint for heating.

Min. 0 (disabled) Max. 2

C.19 PSTG_C2) 3) Determines the prestart gradient to reach the comfort setpoint for cooling.

Min. 0 (disabled) Max. 2

C.20 tvd2)

Determines the damper prestart time before scheduled comfort mode

Min. 0 (normal control) Max. 90

C.21 Adapt2) Optimum Start Self Adaption speed

Min. 0 Max. 100

C.22 Adr1)

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

Min. 0 Max. 255

C.23 DefProg Initiates the default programming.
0 No Default programming 1 Initiates 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)

default setting
I / II
0

R7426 A B C x x x

0/1 x x x

0 xxx

0/1 x x x

3 xxx (March)
10 x x x (Oct.)
0 K/min x x x

0 K/min x x x

15 min

x x

50% x x x

254 x x x

0 xxx

actual value

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

control par. no. name

description

setting I / setting II low high def.

resolution

unit

R7426 ABC

P.01 W1

Main setpoint for input T1

0

50 / 21 / 130 70

0.5

°C x x x

P.02 Wlim

Limit setpoint (low or high) for input T2

5 / 30

50 / 16 / 130 90

1

°C x x x

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

% xxx

P.05 Su

Summer compensation authority

-100 +100 0

1

% xxx

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

xx

P.11 Xph

Heating throttling range for sequence control

1

40 6 0.5 K

xx

P.12 tr11)

Reset time (main control loop)

OFF, 20 sec

20 min

OFF

10/ 0.5

sec/ min

x

x

x

P.13 tr21)

Reset time (cascade control loop)

OFF, 20 sec

20 min

OFF

10/ 0.5

sec/ min

x

x

x

P.14 MINPOS Minimal pos. for air damper actuators

0

50 20 1 %

xx

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

xx

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

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

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

P.26 NOFFS2) Offset of main setpoint in Night mode

0

30 5 0.1

sec

x

°C x x x

°C x x x

K xxx

1. for tr > 2 min resolution = 0.5 min, for tr < 2 min resolution = 10 sec 2) 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

actual value

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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 (Wlim), and submaster temperature (Wcas) are selected for air temperature 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.
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 range

sensor / remote setpoint unit type

CPATYP 0 CPA: ±5 K internal

CPATYP 1 (953…1053)

CPA: ±5 K

T7412B1016 (Pt 1000)

CPATYP 2 (100k…0)

CPA: ±5 K

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

CPATYP 3 (10…20k)

SPA: 15 … 30°C

T7412B1024 (BALCO 500) T7412B1040 (Pt 1000)

CPATYP 4 (0…10k)

CPA: ±5 K

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

CPATYP 5 (0…100k)

SPA: 15…30°C

43193982-001

CPATYP 6 (0…100k)

SPA: 0…50°C or 0…130°C

43193982-001

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).

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

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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 Y1CTRF YxMode

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

1

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

1

with two outputs (Y1, Y3) for

heating and one output for

2

cooling (Y2)

with one output (Y2) for heating and two outputs for 3 cooling (Y1, Y3)

0

0

1

0

n.a.

0

n.a.

0

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

0

0

0

energy recovery, cooling and heating

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

YMode YxMode

provided by
output

function of Y2

1

4 (x=1, 2, and 3)

Y1,Y2,Y3

n.a.

4-stage ON/OFF sequence control 2 heating

4-stage ON/OFF sequence control 3 cooling

15-stage binary

coded ON/OFF sequence control

5

H.

4 (x=1 and 3)
4 (x=1 and 3)

Y1,Y3 Y1,Y3

n.a.

Y1,Y3

according to Y2Mode

two-position damper control

4

n.a.

Y1

individual (cooling and heating)

Y2 and Y3 1)

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.

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 temperature

of sensor type

range

characteristics

Pt 1000

-30….+130°C 1000 at 0°C

BALCO 500 -30….+130°C 500 at 23.3°C

NTC 20k

-30….+85°C / -30….+130°C1)

20k at 25°C

1. NTC sensor is detected automatically if, during powerup, 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).

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.

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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 0.
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 Wlim (P.02)
For high or low limit control, the control parameter Wlim is 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 Wlim determines the control point at which the submaster setpoint (Wcas) maintains 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 Wcas (P.06)
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 Wcas is set to any value other than OFF. 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 Wcas is automatically altered. Cascade control is disabled if the submaster setpoint Wcas is 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.
Reset Span Adjustment Rcas (P.07)
The reset span adjustment Rcas determines the reset effect in Kelvin. The submaster setpoint Wcas is altered if the temperature (T1) deviates by 50% of the throttling range Xp1.
Throttling Range Xp1 / Xp2 (P.08 / P09)
Proportional band (throttling range Xp) adjustment determines the temperature change, required at the main sensor (T1) and

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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

R7426B,C Controller

Main Temp. Seq. Control

Mixed Air Damper

T1 x

x

Energy Recovery

T1 x

x

Heating

T1

x x

Cooling

T1

x

x

R7426B,C Controller

Temperature Cascade Sequence Control

Master

T1 x

x

Submaster

– 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 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 0

Y3 Heating

1/4 Xp1
Damper Y1
CTRPH CTRP1 CTRPC

if Xpc = Off
Y2 Cooling
if Xpc = Off
Xwh / Xwc /Xwd

Xph

Xp1

Xpc

T2

Fig. 3. Temperature sequence control with heating, mixed air dampers, and cooling valve

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 Xh of the heating or cooling coil must be 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 Xp for discharge air control can be calculated by using the following rule-of thumb formula:
Xp = Xh 5

For room temperature control, the following rule-of-thumb

formula can be used:

Xp = Xh or tmaxdischarge air

10

10

The tmax (Xh) of the discharge air for mixed air damper control is the maximum difference between outdoor air (OA)

temperature and return air (RA) temperature.

Xh = RA – OAmin
The often-specified accuracy for room control of ±1 (Xp = 2K) 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:

· Discharge air control

Xp = Xh 4…5

· Room control

Xp = Xh or tmaxdischarge air

8…10

8 … 10

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

0 t

Y

P

P tr

%/s

P =1X0p0 X w %

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

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

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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 Tu 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 Tu is in the range of 0.5 to 5 min, which results in a setting of 1 to 15 min.
Start Point Ystart (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 Wcomp (P.03)
The control parameter Wcomp defines the start point of summer or winter compensation. Above the compensation changeover point (Wcomp) summer compensation and below Wcomp winter compensation is performed.
Summer / Winter Compensation Authority Su / Wi (P.04 / P.05)
These authority settings determine the reset effect (OATComp) 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.

Table 12. Calculation of summer/winter compensation

control schedule

room temp. (T1)
20°C

outdoor air temp.
(T3/Tcomp)
20°C

throttling range (XP)
2°C

22°C

-15°C

2°C

Winter

Aut Wi = T1+ Xp 100% = t Outside Air
(22 – 20) + 2 100% = 12% 35

20°C

20°C

2°C

26°C

35°C

2°C

Summer

Aut Su = T1- Xp 100% = t Outside Air
(26 – 20) – 2 100% = 27% 15

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

NOTE: With P+I control Xp = 0

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.

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Y (%) 100

UNOCCUPIED

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.

OCCUPIED

SOFFS Xph

SOFFS Xpc

T (°C)

CTRPH CTRPC
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 T1CAL, T2CAL and T3CAL.

Return Air Offset RetOffs (P.20)
The control parameter RetOffs is available only on R7426B,C controllers and is used to activate economizer mode (RetOffs OFF) for mixed air damper (Y1CTRF = 0) or energy recovery system control (Y1CTRF = 1).
If the main temperature sensor (T1) is installed in the exhaust air, the control parameter RetOffs should be set to 0. In 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 RetOffs. This will be added to the actual measured room temperature value to simulate exhaust air conditions.
The economizer mode is disabled if the value of the control parameter RetOffs is programmed to OFF or if no outdoor air temperature sensor is connected.

Minimum Position MINPOS (P.14)
The control parameter adjustment MINPOS is available on 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.

Runtimex, x = Y1, Y2, or Y3 (P.21…P.23)
The control parameters Runtimex (x = Y1 for R7426A; 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 Runtimex multiplied by 1.25. 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.
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 TIME*

CONTROLLER MODE OFF NIGHT* STANDBY COMFORT

LOW BATTERY*

Date Off °C % rh min sec K

ENGINEERING UNITS

MoTuWeTh Fr SaSu H1 H2 H3

VALUE

WEEKDAYS / GROUPS HOLIDAY SCHEDULE TYPES
*ON CONTROLLERS WITH REAL-TIME CLOCKS, ONLY.
PUSH BUTTONS

SELECTION OR ESCAPE
PARAMETER / VALUE CONFIRMATION

ADJUSTMENT OR SELECTION

Fig. 6. User interface

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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 SET or SEL button. Pushing the SEL button leads back to standard display mode.

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.

POWER UP

AUTOMATIC DISPLAY

OUTPUT ADJUSTMENT
MODE

AND

FOR APPROX. 1 SEC

OUTPUT

STANDARD

SELECTION

DISPLAY

MODE

MODE

FOR APPROX. 1 SEC
AND
PARAM./CONFIG. SELECTION MODE

PARAM./CONFIG. ADJUSTMENT MODE

OUTPUT FIXING
NO OUTPUT FIXING
AND

RELEASE OF OUTPUT FIXING

FOR APPROX. 1 SEC

CLOCK / SCHEDULE SELECTION

CONTROLLERS WITH REAL-TIME
CLOCKS, ONLY.

Fig. 7. Operating overview

NO PARAMETER VALUE CHANGE

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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
A

ON CONTROLLERS WITH REAL-TIME CLOCK, ONLY

We Date
We

TIME & WEEKDAY
DATE

by the SET button are ignored by the controller and old parameter values will be retained.
B
A
°C
SUBMASTER / LIMIT SETPOINT CTRP2
°C
COMPENSATION TEMPERATURE T3

°C
MAIN TEMPERATURE T1

% rh
HUMIDITY DEVIATION XWrh R7426B,C, ONLY

°C
MAIN SETPOINT CTRP1

%
OUTPUT Y1 *)

°C
LIMITATION / CASCADE TEMPERATURE T2

%
OUTPUT Y2 *)

R7426B,C, ONLY

B

%

OUTPUT Y3 *)

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

OUTPUT TYPE CONTROL RANGE

FLOATING

0…100%

0…10VDC

0…100%

2…10VDC

0…100%

OUTPUT RANGE 0…100%
0…120% –> 0…12V (DIR) -20…100% –> 12…0V (REV)
-25…125% –> 0…12V

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

Fig. 8. Standard display mode

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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 Night1)

OFF – icon Moon – icon

Standby

Halfsun – icon

Comfort

Sun – icon

Freeze Protection Alarm and Freeze protection icon in

Operation2)

addition

Low battery 1) 2) 3)

Battery icon

Optimum Start 1)

Sun icon is flashing 1Hz

1. On controllers with real-time clock, only.

2. Status information is displayed together with actual icon

for the controller mode.

3. In order to improve battery lifetime, low battery detection

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.

°C
°C
FIRST DISPLAYED CONFIGURATION PARAMETER:
FOR R7426C FOR R7426A,B

ACTUAL PARAMETER
VALUE

NOTE: CONTROL OR CONFIGURATION PARAMETERS WHICH ARE NOT AVAILABLE ON THE GIVEN CONTROLLER VERSION ARE SKIPPED.
Fig. 9. Parameter/Configuration Selection Mode

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 + or – button scrolls through the parameter list.
Pushing the 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 SEL button retains the old parameter value. Pushing the 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 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.

TO ADJUST

°C

OR

PARAMETER

VALUE

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 F (fixed).
Pushing the + or – button scrolls through the output list.
Pushing the SET button enters the adjustment mode.
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 + or – button increments or decrements the value
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 SET-button after adjustment activates the
manual override (fixing) of output value. · Pushing the SEL button, causes that the output value is
still determined by the control loop (no fixing).

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· To release the manual override (fixed) of the output, select
the output, enter output adjustment mode and push the + and – button simultaneously.
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

% OUTPUT
SELECTION

% OUTPUT
SELECTION

TO ADJUST

%

OR OUTPUT

VALUE

OUTPUT VALUE ADJUSTMENT

%

OUTPUT

VALUE

ADJUSTMENT

AND

%

AUTOMATIC

DISPLAY

FOR APPROX.

1 SEC

%

%

%

OUTPUT

SELECTION

MANUAL OVERRIDE

NO MANUAL OVERRIDE

RELEASE OF MANUAL OVERRIDE

Fig. 12. Output value adjustment for manual override

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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

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.

· 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
time SMode2)

point 2
time SMode2)

point 3
time SMode2)

point 4
time SMode2)

point 5
time SMode2)

point 6
time SMode2)

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

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

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

day 1. 2. 3. 4.

Jan. H0 H0 H0 H0

Feb. March April May June July August Sept. Oct.

H0

H0

H0

H3

H0

H0

H0

H0

H0

H0

H0

H0

H0

H0

H1

H0

H0

H0

H0

H0

H0

H0

H0

H1

H0

H0

H0

H0

H0

H0

H0

H0

H1

H0

H0

H0

Nov. H0 H0 H0 H0

Dec. H0 H0 H0 H0

H0

H0

H0

H0

H0

H0

H1

H0

H0

H0

H0

H0

H0

H01)

H0

H0

H0

H0

H0

H0

H0

H0

H0

H0

H0

H0

H0

H0

H0

H0

H0

H0

H0

H0

H0

H0

H0

H0

H0

H0

H0

H0

1)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)

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Selecting Clock and Schedules (with RTC, only)

DATE & TIME SELECTION

DATE & TIME ADJUSTMENT

STANDARD SCHEDULE SELECTION

STANDARD SCHEDULE PROGRAMMING

HOLIDAY SCHEDULE SELECTION

HOLIDAY SCHEDULE PROGRAMMING

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.

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 SEL button returns to the selection mode, ignoring adjustments which have not been confirmed by the SET button.
Due to battery change or low battery, the date / time can be invalid and is displayed as –.–. — / –:– on the LCD. In this case the controller behaves like a controller without real-time clock. If the occupancy input is inactive, the controller will be assumed as occupied.

OR

TO ADJUST HOURS

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 + and – button simultaneously.
Pushing the SEL button returns to the selection mode, ignoring adjustments which have not been confirmed by the SET button.

TO SELECT

WEEKDAY,

OR

WEEK GROUPS,

OR HOLIDAY

TYPES

TO ADJUST

OR

SCHEDULE

POINT

Tu

TO ADJUST

OR

SWITCHING

TIME

Tu

TO ADJUST

OR

CONTROLLER

MODE

Tu

TIME ADJUSTMENT

OR

TO ADJUST MINUTES

Fig. 15. Standard schedule programming

Date

OR

TO ADJUST YEAR

DATE ADJUSTMENT

Date

OR

TO ADJUST MONTH

Date

OR

TO ADJUST DAY

Fig. 14. Date and time adjustment mode

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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 + or – button during the first step of the holiday
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 SET button selects the displayed holiday and 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 SET button. To reset a holiday to normal day, day type H0 has to be set for the specific day.
Pushing the SEL button returns to the selection mode, ignoring adjustments which have not been confirmed by the SET button.

Interpreting Error Messages

Different analog input errors can be identified by the controller (Error handling). The defective analog input (T1, T2, T3 or Xwrh) will be displayed in the standard display mode (see Fig. 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

· for CPATYP 3 SPA value = control parameter W1

DISPLAY SHOWN IF NO SENSOR IS CONNECTED DURING POWER-UP

DISPLAY SHOWN AFTER ERROR IDENTIFICATION DURING OPERATION

STANDARD DISPLAY

°C % rh

°C % rh

STANDARD DISPLAY

TO

OR

TOGGLE/DISPLAY PROGRAMMED

HOLIDAY

We

OR

TO ADJUST MONTH

Sa

OR

TO ADJUST DAY

Th

TO ADJUST

OR

DAY TYPE (H0,

H1, H2, OR H3)

We

Fig. 16. Holiday schedule programming

AND AND AND SPACE AND

: MAIN TEMPERATURE SENSOR T1 IS DEFECTIVE : LIMITATION OR CASCADE TEMPERATURE SENSOR T2 IS DEFECTIVE : COMPENSATION TEMPERATURE SENSOR T3 IS DEFECTIVE : ERROR OF HUMIDITY DEVIATION INPUT XWrh
TEMPERATURE DISPLAY IN °C HUMIDITY DEVIATION DISPLAY IN % rh
Fig. 17. Error handling

STANDARD DISPLAY MODE
PARAMETER SELECTION
MODE

A
°C
°C

PUSH SIMULTANEOUSLY
FOR APPROX. 2 SEC
PARAMETER ADJUSTMENT
MODE

B
°C

°C

PARAMETER

°C

SELECTION

MODE

PUSH UNTIL NEEDED VALUE IS
DISPLAYED

B

A

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

Fig. 18. Adjustment example

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NOTES (WITH RTC, ONLY)

day 1. 2. 3. 4. 5.

Jan.

Feb. March April) May June July August Sept. Oct.

Nov. Dec.

31. 1)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
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EN1B-0203GE51 R0507C

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

day1)

point 1 time SMode2)

point 2 time SMode2)

point 3 time SMode2)

point 4 time SMode2)

Mo

Tu

We

Th

Fr

Sa

Su

H1

H2

H3 1)Weekday or holiday type; 2)Programmed controller mode (schedule mode)

Table 17. Weekly schedule and holiday types

point 5 time SMode2)

point 6 time SMode2)

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 EN1B-0203GE51 R0507C

Manufacturing location certified to

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