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HONEYWELL  
R7426A,B,C  
TEMPERATURE CONTROLLER  
MicroniK 200  
WITH AND WITHOUT REAL-TIME CLOCK  
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 equip-  
ment which can possibly generate electromagnetic  
interference.  
Fig. 1. Temperature Controller  
•
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.  
Contents  
•
•
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.  
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  
•
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  
EN1B-0203GE51 R0507C  
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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  
2
multicore cable end, stranded wires up to 1.5 mm . 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  
W303  
connection by short pull on the wire.  
Table 1. Terminal Connection  
controller to CPA/SPA potentiometer  
Fig. 2. Parallel Connection of Compensation Sensor T3  
T7412B1057/1008 T7412B1024  
T7412C1030/1006 T7412B1040  
R7426A,B,C T7412B1016  
Table 3. Jumper States  
state description  
closed  
terminal 2  
terminal 4  
terminal 4  
terminal 5  
terminal 4  
terminal 4  
1
)
jumper  
W303  
terminal 6  
terminal 5+6  
T3 supplied by this controller  
R7426A,B,C 43193982-001  
-
-
-
-
-
-
T3 supplied from another  
controller  
open  
terminal 2  
terminal 4  
terminal 1  
terminal 3  
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  
Table 2. Wire Dimensions  
type of  
wires  
length max.  
2
wiring run  
2
1.0 mm  
1.5 mm  
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.  
from controller to all  
input and output  
devices  
local  
standard  
100 m  
150 m  
POWER SUPPLY AND GROUNDING  
1
. Refer to job drawings and verify correct supply voltage to  
transformer (230 Vac) and controller (24 Vac).  
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.  
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.  
4. Do not connect the secondary side of the transformer to  
the installation ground.  
EN1B-0203GE51 R0507C  
2
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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  
default  
setting  
R7426  
actual  
value  
description  
A
B
C
C.01 DIR/REVY1 Selects the output action of Y1 to adapt the valve or damper direction  
C.02 DIR/REVY3 Selects the output action of Y3 to adapt the valve or damper direction  
C.03 DIR/REVY2 Selects the output action of Y2 to adapt the valve or damper direction  
Dir  
Dir  
Dir  
x
x
x
Dir Direct acting output signal  
Rev Reverse acting output signal  
Control type selects the setpoint operating range and default parameter  
setting I or II.  
set- operating range  
pt.  
1
)
C.04 Ctrltyp  
Lo  
x
x
x
x
x
for I  
*)  
setting  
Lo 0...50°C  
Hi1 0...130°C  
Hi2 0...130°C  
for ventilation systems (factory preset)  
I
II  
II  
for heating systems  
with pump ON/OFF operation  
C.05 CPATYP  
Selects the Control Point /SetPoint Adjustment type.  
0
x
CPA potentio-  
CPA/SPA  
sensor / remote setpoint unit type  
numbers  
TYP meter range range  
0
1
internal  
953...1053Ω CPA: ±5K  
CPA: ±5K  
internal  
T7412B1016 (Pt 1000)  
T7412B1057 / T7412C1030 (Pt 1000)  
T7412B1008 / T7412C1006 (NTC 20kΩ)  
43193982-001  
2
100kΩ...0Ω CPA: ±5K  
SPA:  
T7412B1024 (BALCO 500)  
T7412B1040 (Pt 1000)  
3
10...20kΩ  
1
5 ... 30°C  
4
5
0...10kΩ  
0...100kΩ  
CPA: ±5K  
SPA: 15...30°C 43193982-001  
HCW 23 (setpt wheel printed with +/- 5 K)  
SPA: 0...50°C  
43193982-001  
or 0...130°C  
6
0...100kΩ  
C.06 YRange  
C.07 Startup  
Selects the output control range for all outputs (Y1, Y2, and Y3)  
1
x
x
0
1
2 ... 10 Vdc  
0 ... 10 Vdc  
Enables the start-up routine  
OFF  
x
OFF Disabled  
ON Enabled  
C.08 Y1Mode  
C.09 Y3Mode  
C.10 Y2Mode  
Y1 output mode selects an individual output function for Y1  
Y3 output mode selects an individual output function for Y3  
Y2 output mode selects an individual output function for Y2  
4
4
4
x
x
x
x
0
1
2
3
4
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)  
Sequence control for heating or cooling (Y1,Y2, Y3);  
or 6-stage ON/OFF  
x
x
x
x
x
1
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)  
Two-position damper control (Y1), heating (Y3) and cooling (Y2)  
15-stage binary coded ON/OFF for heating (Y1, Y3), and cooling (Y2)  
x
x
x
x
x
x
x
x
x
2
3
4
5
Table 4. Configuration parameters R7426A,B,C  
3
EN1B-0203GE51 R0507C  
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R7426A,B,C TEMPERATURE CONTROLLER WITH AND WITHOUT REAL-TIME CLOCK  
config. par.  
default  
setting  
I / II  
R7426  
actual  
value  
description  
no.  
name  
A
B
C
0
x
x
x
x
x
x
x
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  
x
x
C.13 LimTyp  
C.14 Senstyp  
Limitation type determines whether the limit function is low or high.  
0 / 1  
0
0
1
Low limit  
High limit  
Sensor type determines automatic detection or manual selection of NTC  
sensors.  
0
1
Auto detection  
NTC sensor type  
0
/ 1  
x
x
x
C.15 Y1CTRF  
Controls the action of Y1 or activates the occupancy input for summer/winter  
changeover.  
R7426A  
R7426B,C  
0
1
2
cooling  
0
1
mixed air damper  
energy recovery  
heating  
summer/winter changeover  
2
)
3
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
C.16 AddHour Adjusts the month for winter/summer time change.  
Min. 0 (disables winter/summer time change)  
Max. 12  
(March)  
2
)
10  
C.17 SubHour Adjusts the month for summer/winter time change.  
Min. 0 (disables summer/winter time change)  
Max. 12  
(Oct.)  
2
2
) 3)  
) 3)  
0
K/min  
K/min  
5 min  
C.18 PSTG_H  
C.19 PSTG_C  
Determines the prestart gradient to reach the comfort setpoint for heating.  
Min. 0 (disabled)  
Max. 2  
0
Determines the prestart gradient to reach the comfort setpoint for cooling.  
Min. 0 (disabled)  
Max. 2  
2
)
1
C.20 tvd  
Determines the damper prestart time before scheduled comfort mode  
Min. 0 (normal control)  
Max. 90  
2
)
5
0%  
x
x
x
C.21 Adapt  
Optimum Start Self Adaption speed  
Min. 0  
Max. 100  
1
)
254  
C.22 Adr  
Sets the serial communication address, used for service or maintenance.  
Min. 0  
Max. 255  
0
C.23 DefProg  
Initiates the default programming.  
0
1
No Default programming  
Initiates Default programming  
1
)
)
)
actual value will not be changed during reset to default parameter  
on Controllers with Real-Time Clock, only  
2
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)  
EN1B-0203GE51 R0507C  
4
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R7426A,B,C TEMPERATURE CONTROLLER WITH AND WITHOUT REAL-TIME CLOCK  
control par.  
no. name  
setting I / setting II  
R7426  
reso-  
lution  
actual  
value  
description  
unit  
low  
high def.  
A
B
C
5
1
0 / 21 /  
30 70  
P.01 W1  
Main setpoint for input T1  
0
0.5  
1
°C  
°C  
x
x
x
x
x
5
3
/
0
50 / 16 /  
130  
P.02 Wlim  
Limit setpoint (low or high) for input T2  
x
90  
20  
0
P.03 Wcomp  
P.04 Wi  
Compensation changeover point for input T3  
Winter compensation authority  
-5  
-350  
-100  
OFF, 0  
0
40  
1
2
°C  
%
%
°C  
K
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
+350  
+100  
50  
P.05 Su  
Summer compensation authority  
Submaster or cascade setpoint  
0
1
P.06 Wcas  
P.07 Rcas  
P.08 Xp1  
20  
10  
2
0.5  
0.5  
0.5  
Cascade reset span adjustment  
40  
Throttling range (main control loop) for T1  
0.5  
40  
K
Throttling range (cascade or limit control loop)  
for T2  
P.09 Xp2  
0.5  
40  
10  
0.5  
K
x
x
x
P.10 Xpc  
P.11 Xph  
Cooling throttling range for sequence control  
Heating throttling range for sequence control  
OFF, 1  
1
40  
40  
3
6
0.5  
0.5  
K
K
x
x
x
x
1
)
OFF,  
20  
min  
10/  
0.5  
sec/  
min  
P.12 tr1  
P.13 tr2  
Reset time (main control loop)  
OFF  
OFF  
x
x
x
x
x
x
20 sec  
1
)
OFF,  
20  
min  
10/  
0.5  
sec/  
min  
Reset time (cascade control loop)  
20 sec  
P.14 MINPOS  
P.15 Ystart  
P.16 SOFFS  
P.17 T1Cal  
P.18 T2Cal  
P.19 T3Cal  
P.20 RetOffs  
Minimal pos. for air damper actuators  
Start point for mid range shift of output Y1  
Offset of main setpoint in Standby mode  
Calibration of temperature sensor T1  
Calibration of temperature sensor T2  
Calibration of temperature sensor T3  
Return air offset to simulate exhaust air cond.  
0
-20  
0
50  
+20  
10  
20  
0
1
%
K
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
0.5  
0.1  
0.1  
0.1  
0.1  
x
x
x
x
x
2
K
-20  
-20  
-20  
OFF, 0  
6
+20  
+20  
+20  
5
0
K
0
K
0
K
OFF 0.1  
K
P.21 RuntimeY1 Actuator run time for Y1  
P.22 RuntimeY3 Actuator run time for Y3  
P.23 RuntimeY2 Actuator run time for Y2  
180  
180  
180  
19  
60  
60  
1
1
sec  
sec  
sec  
°C  
°C  
K
x
6
6
60  
1
2
)
P.24 NightLow