Honeywell R7426A Benutzerhandbuch

EN1B-0203GE51 R0507C 

6 

 

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. 
 

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). 
 

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

), and 

submaster temperature (W

) are selected for air tem-

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 Hi- 
to 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. 

 

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 0 

CPA: 

±5 K 

internal 

CPATYP 1 
(953...1053

Ω) CPA: ±5 K  

T7412B1016 (Pt 1000) 

CPATYP 2 
(100k

Ω...0Ω)  CPA: ±5 K 

T7412B1057 (Pt 1000) 
T7412C1030 (Pt 1000) 
T7412B1008 (NTC 20k

Ω) 

T7412C1006 (NTC 20k

Ω) 

43193982-001 

CPATYP 3 
(10...20k

Ω) 

SPA: 
15 ... 30

°C 

T7412B1024 (BALCO 500) 
T7412B1040 (Pt 1000) 

CPATYP 4 
(0...10k

Ω) 

CPA: 

±5 K 

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

CPATYP 5 
(0...100k

Ω) 

SPA: 
15...30

°C 

43193982-001 

CPATYP 6 
(0...100k

Ω) 

SPA: 0...50

°C 

or 0...130

°C 

43193982-001 

 

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. 

 

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. 
 

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 con-
figuration 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