Parameter Details - Honeywell R7426B Product Data

R7426A,B,C TEMPERATURE CONTROLLER
Parameter R7426
# Name A B C
C.14 Senstyp x x x Sensor type detection (0: Automatic detection; 1: Manual selection of NTC).
C.15 O1CTRF x x x Control function.
x x x 0
x
C.16 AddHour x x x Adjusts month for winter/summer time change. Minimum: 0 (disabled), Maximum: 12.
C.17 SubHour x x x Adjusts month for summer/winter time change. Minimum: 0 (disabled), Maximum: 12.
C.18 PSTG_H x x x Prestart gradient for heating (in °F/min): 0 (disabled) is minimum, 2 is maximum.
b
C.19 PSTG_C x x x Prestart gradient for cooling (in °F/min): 0 (disabled) is minimum, 2 is maximum.
b
C.20 tvd x x Damper prestart time: Minimum: 0 (normal control), Maximum: 90 minutes.
C.21 Adapt x x x Optimum Start-Self Adaptation speed (in percent): 0 is minimum, 100 is maximum.
C.22 Adr a x x x Serial communication address (value from 0 to 255).
C.23 DefProg x x x Default program initiation (0: No default program; 1: Initiates default program).
C.27 OnDelay x x x On/Off output on delay in minutes (0 to 10 min. with 1 min. resolution).
C.28 TRAMP x x Start-up ramp time in minutes (0 = Off, 0 to 10 min. with 1 min. resolution).
a
Actual Value unchanged during reset to default.

Parameter Details

The following information applies only to controllers that have
the noted parameter (see Tables 13 and 14). Not all
parameters are detailed.
NOTE: All configuration parameters (see Table 14) have to
be set to select the correct control functions required
by the job application and, in some cases, to start
control operation and synchronization of the final
control devices.
Action: Dir/RevO1, O2 or O3 (C.01, C.02, C.03)
The output action of the analog outputs on the R7426C
Con-troller 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 only needed if the actuator does not provide a
direction selector switch, plug or similar.
On the R7426A,B controllers the change of the direction can
be performed by exchange of the wiring connections open-
close (OUT2-OUT1).
Operating Range Selection: Ctrltyp (C.04)
Changing parameter Ctrltyp value from Lo to Hi control range
or vice versa causes the R7426A controller to change all
parameter values to the appropriate default.
For manual parameter reset see How to Reset Parameter
Values to Default Values section.
63-2564—1
Table 14. Configuration Parameters. (Continued)
Economizer Mixed Air or Cooling
2 Summer/Winter Changeover
Description
1 Economizer Energy Recovery
or Heating
b
Controller can overwrite for self-adaptation purposes.
Enable Start-up Routine (C.07)
A start-up routine is provided to prevent start-up problems for
R7426B,C controllers (three outputs). Enable this routine by
setting Startup parameter to On.
After power up reset (initial start) or the controller mode
changes to night, unoccupied or occupied, the outdoor air and
exhaust air dampers (O1) will stay in the closed position (0
percent). After an adjustable time (1 to 10 minutes) of
operation, O1 returns to normal operation.
NOTE: If OAT is below 43°F (6°C), setpoint W1 is raised
temporarily by Xp1 and linearly decreased to its
normal value over an adjustable time period (1 to 10
minutes) by the configuration parameter TRAMP.
If the controller mode changes to Off, output signals O1, O2
and O3 are set to 0 percent. If the Optimum Start Program is
enabled the Start-up Routine is disabled.
Control Function: O1CTRF (C.15)
If parameter O1CTRF is 2 (R7426A only), output O1 action
depends on occupancy input (see Summer/Winter
Changeover Function).
If the parameter is set to 0, output O1 is selected for cooling
(R7426A), or mixed air control is selected (R7426B,C).
If the parameter is set to 1, heating (R7426A) or energy
recovery is selected (R7426B,C).
Time Change: AddHour / SubHour (C.16 / C.17)
These parameters are required to adjust the time for Daylight
Saving Time. The one hour clock change occurs at 2:00 AM
the last Sunday of the month selected.
16
Setting I /
Setting II
Default
0
0 / 1
3
10
0
0
15
50
254
0
3
10