Honeywell R7426A SPECIFICATION DATA

EN0B-0299GE51 R0104

R7426A

TEMPERATURE CONTROLLER

WITH REAL-TIME CLOCK

SPECIFICATION DATA

Fig. 1. Temperature controller

GENERAL

The R7426A temperature controller covers all space, air or

water flow temperature applications within the selectable

control range of 0...50°C (LOw range) or 0...130°C (HI range)

with optional high or low limit control and outside air

temperature compensation reset of the main setpoint. The

controller can be configured to perform space-discharge air

or supply water temperature cascade control.

FEATURES

 Weekly time schedule with up to six switching points

per day

 Automatic daylight saving time change

 Four different operating modes: Comfort, Standby,

Night, and OFF

 Yearly holiday programming in advance

 Three types of holiday schedules

 Self-adaptive optimum start program for room control

system

 Night cycle program

Order Numbers

Order-No. Controller Description

R7426A2014 Temperature controller with integrated

real-time clock (RTC), Plant/System

ON/OFF output, and one 3-position

floating output. The controller offers the

choice of selectable output signals to

drive solid-state relays or step relays.

MicroniK 200

Fig. 2. LC Display

R7426A TEMPERATURE CONTROLLER

EN0B-0299GE51 R0104 2

TECHNICAL DATA

General

Electronic 8-bit microcontroller, 10-bit A/D converter, EEPROM, and LC

display

Power supply 24 Vac +10...-15%, 50/60 Hz

Power consumption 3 VA + Actuator power requirements

Control range

0...50°C (LOw range) or 0....+130C (HI range)

Battery

Type CR2032 (life time  8 years)

Temperature

T1 Main temperature sensor

Inputs

T2 Limit or cascade temperature sensor

T3 Compensation temperature sensor

accuracy 0.5 K

excluding

sensor

Sensor type

1)

Automatic identification of sensor type Temperature range Characteristics

2)

Pt 1000

-30....+130C 1000 τ at 0C

BALCO 500

-30....+130C 500 τ at 23.3C

NTC 20kτ -30....+85C / -30....+130C

1)

20 kτ at 25C

CPA/SPA-Input

1)

CPA/SPA range Sensor & CPA/SPA types

CPATYP 0

CPA: 5 K

internal

CPATYP 1 (953...1053 τ) CPA: 5 K

T7412B1016 (Pt 1000)

CPATYP 2 (100 kτ...0 τ) CPA: 5 K

T7412B1057 (Pt 1000)

T7412C1030 (Pt 1000)

T7412B1008 (NTC 20kτ)

T7412C1006 (NTC 20kτ)

CPATYP 3 (10...20 kτ) SPA: 15...30C

T7412B1024 (BALCO 500)

T7412B1040 (Pt 1000)

CPATYP 4 (0...10 kτ) CPA: 5 K

HCW 23 (setpoint wheel

printed with +/- 5 K)

CPATYP 5 (0...100 kτ) SPA: 15...30C

43193982-001

CPATYP 6 (0...100 kτ) SPA: 0...50C or 0...130C

43193982-001

Digital inputs Mode Potential free contact

Occupancy or summer/winter changeover

input

1)

unoccupied or winter operation

occupied or summer operation

open > 40 kτ

closed < 100 τ

Freeze protection input freeze protection operation

normal operation

open > 40 kτ

closed < 100 τ

Outputs ON/OFF output OFF

ON

TRIAC output

 Floating

1)

 2 or 3-stage

1)

ON (24 Vac) / OFF (0 Vac)

 Pulse-width modulation

1)

0...100%

based on run time

max. load

450 mA at

24 Vac per

output

Ambient limits

Operating temperature

0...50°C (0...122F

)

Transport and storage temperature

-35...+70°C (-31...+158F

)

Relative humidity 5...95%rh non-condensing

Safety

Protection class II as per EN60730-1

Protection standard IP30 or IP40 (front panel mounting) as per EN60529

Housing

Dimensions (H x W x D) 105 x 152 x 37 mm

Weight 250 g

Mounting Front door, back panel, wall, or rail

Connections Connection terminal terminals max. 1 x 1.5 mm

2

1)

Selectable

2)

same sensor type must be used for T1, T2, and T3

R7426A TEMPERATURE CONTROLLER

3 EN0B-0299GE51 R0104

CONTROL AND CONFIGURATION PARAMETER

The controller includes two groups of settings (A and B) for control and configuration parameters that are automatically

selected during programming. For parameter Ctrltyp = Lo setting A is selected and for parameter Ctrltyp = Hi setting B is

selected.

Control Parameter Setting A / Setting B

No. Name

Parameter Description

Low High Default

Reso-

lution

Unit

P.01 W1 Main setpoint for input T1 0 50/130 21 / 70 0.5 C

P.02 Wlim Limit setpoint (low or high) for input T2 5 / 30 50/130 16 / 90 1 C

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

P.04 Wi W inter compensation authority -350 +350 0 2 %

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

P.06 Wcas Submaster or cascade setpoint OFF, 0 50/130 20/OFF 0.5 C

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

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

P.09 Xp2

Throttling range (cascade or limit control loop)

T2

0.5 40 10 0.5 K

P.12 tr1

1)

Reset time (main control loop) T1 OFF, 20 s 20min OFF 10/0.5 sec/min

P.13 tr2

1)

Reset time (cascade or limit control loop) T2 OFF, 20 s 20min OFF 10/0.5 sec/min

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

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

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

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

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

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

P.24 NightLow Night low limit against temperature extremes OFF, 8 19 / 80 OFF 1 C

P.25 NightHigh Night high limit against temperature extremes OFF, 21 40 OFF 1 C

P.26 NOFFS Offset of main setpoint in Night mode 0 30 5 / 20 0.1 K

Config. Parameter Default

No. Name

Values

A / B

Unit

C.04 Ctrltyp

2)

Lo = 0...50°C, Hi1 = 0...130°C, Hi2 = 0...130°C Lo

C.05 CPATYP

0 = internal (default), 1 = 5 K (953...1053 τ), 2 = 5 K (100 kτ...0 τ),

3 = 15 … 30C (10...20 kτ), 4 = 5 K (0...10 kτ),

5 = 15 … 30C (0...100 kτ), 6 = 0...50C or 0...130C (0...100 kτ)

0

C.08 Y1Mode

0= floating, 1= 2 stage ON/OFF, 2= 3 stage ON/OFF, 3 = pwm, 4 = unconfig.

(safe state is configured prior to controller's start-up)

4

C.12 T2ext 0 = T2 installed 1 = T1 signal used for T2 0

C.13 LimTyp 0 = Low limit 1 = High limit 0 / 1

C.14 Senstyp 0 = Auto detection 1 = NTC sensor type 0

C.15 Y1CTRF

Output Y1 used for: 0 = cooling, 1 = heating

2 = summer/winter changeover

0 / 1

C.16 AddHour Adjusts the month for winter/summer time change: 0 (disabled) = Min. 12 = Max. 3 month

C.17 SubHour Adjusts the month for summer/winter time change: 0 (disabled) = Min. 12 = Max. 10 month

C.18 PSTG_H

3)

Prestart gradient for heating: 0 (disabled) = Min. 2 = Max. 0 K/min

C.19 PSTG_C

3)

Prestart gradient for cooling: 0 (disabled) = Min. 2 = Max. 0 K/min

C.21

Adapt

Optimum Start Self Adaption speed: 0 = Min. 100 = Max. 50 %

C.22

Adr

2)

Serial communication address: 0 = Min. 255 = Max. 254

C.23

DefProg

0 = No default programming 1 = Initiates default programming 0

1)

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

2)

actual value will not be changed during reset to default parameter

3)

can be overwritten by controller for self-adaption purposes, resolution = 0.01 K/min