Honeywell R7426A SPECIFICATION DATA
MicroniK 200
Fig. 1. Temperature controller
R7426A
TEMPERATURE CONTROLLER
WITH REAL-TIME CLOCK
SPECIFICATION DATA
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
Fig. 2. LC Display
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.
EN0B-0299GE51 R0104
R7426A TEMPERATURE CONTROLLER
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
Temperature
Inputs
Sensor type
1)
CPA/SPA-Input
Control range
Battery
T1 Main temperature sensor
T2 Limit or cascade temperature sensor
T3 Compensation temperature sensor
Automatic identification of sensor type Temperature range Characteristics
Pt 1000
BALCO 500
NTC 20kτ -30....+85C / -30....+130C
1)
CPATYP 0
CPATYP 1 (953...1053 τ) CPA: 5 K
CPATYP 2 (100 kτ...0 τ) CPA: 5 K
0...50°C (LOw range) or 0....+130C (HI range)
Type CR2032 (life time 8 years)
accuracy 0.5 K
excluding
sensor
2)
-30....+130C 1000 τ at 0C
-30....+130C 500 τ at 23.3C
1)
20 kτ at 25C
CPA/SPA range Sensor & CPA/SPA types
CPA: 5 K
internal
T7412B1016 (Pt 1000)
T7412B1057 (Pt 1000)
T7412C1030 (Pt 1000)
T7412B1008 (NTC 20kτ)
T7412C1006 (NTC 20kτ)
CPATYP 3 (10...20 kτ) SPA: 15...30C
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...30C
CPATYP 6 (0...100 kτ) SPA: 0...50C or 0...130C
43193982-001
43193982-001
Digital inputs Mode Potential free contact
Occupancy or summer/winter changeover
1)
input
Freeze protection input freeze protection operation
unoccupied or winter operation
occupied or summer operation
normal operation
open > 40 kτ
closed < 100 τ
open > 40 kτ
closed < 100 τ
Outputs ON/OFF output OFF
ON
TRIAC output
Floating
2 or 3-stage
1)
1)
ON (24 Vac) / OFF (0 Vac)
Pulse-width modulation
1)
0...100%
max. load
450 mA at
24 Vac per
output
based on run time
Ambient limits
Operating temperature
Transport and storage temperature
0...50°C (0...122F
)
-35...+70°C (-31...+158F
)
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
1)
Selectable
2)
same sensor type must be used for T1, T2, and T3
EN0B-0299GE51 R0104 2
2
R7426A TEMPERATURE CONTROLLER
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
Parameter Description
No. Name
Low High Default
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
P.12 tr1
P.13 tr2
Throttling range (cascade or limit control loop)
T2
1)
Reset time (main control loop) T1 OFF, 20 s 20min OFF 10/0.5 sec/min
1)
Reset time (cascade or limit control loop) T2 OFF, 20 s 20min OFF 10/0.5 sec/min
0.5 40 10 0.5 K
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
Values
No. Name
C.04 Ctrltyp
2)
Lo = 0...50°C, Hi1 = 0...130°C, Hi2 = 0...130°C Lo
0 = internal (default), 1 = 5 K (953...1053 τ), 2 = 5 K (100 kτ...0 τ),
C.05 CPATYP
3 = 15 … 30C (10...20 kτ), 4 = 5 K (0...10 kτ),
5 = 15 … 30C (0...100 kτ), 6 = 0...50C or 0...130C (0...100 kτ)
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)
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
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_H3)Prestart gradient for heating: 0 (disabled) = Min. 2 = Max. 0 K/min
C.19 PSTG_C3)Prestart gradient for cooling: 0 (disabled) = Min. 2 = Max. 0 K/min
C.21
C.22
C.23
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
Adapt
Adr
DefProg
Optimum Start Self Adaption speed: 0 = Min. 100 = Max. 50 %
2)
Serial communication address: 0 = Min. 255 = Max. 254
0 = No default programming 1 = Initiates default programming 0
Resolution
A / B
0
4
0 / 1
Unit
Unit
3 EN0B-0299GE51 R0104
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