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R7426A,B,C,D TEMPERATURE AND UNIVERSAL INPUT CONTROLLERS
Two Position Damper Control (R7426B,C)
If parameter OMode is 4, then the R7426B,C damper output
signal O1 operates as a two-position control:
• When the On/Off input signal is On: O1 is 100 percent.
• When the On/Off input signal is Off: O1 is 0 percent.
• For the O2/O3 output sequence, see the Temperature
Sequence Control with Heating, Mixed Air Damper and
Cooling section.
NOTE: The start-up routine must be disabled.
Analog Output (R7426C only)
Three dc output control signals are provided to control
actuators for valves, dampers, or pneumatics (through E/P
transducers).
The full output range is 0 to 12 Vdc. The control range is
common to all outputs and is software configurable to either:
2 to 10 Vdc, or 0 to 10 Vdc.
NOTE: Use the parameter ORange to configure the output.
Adjustments
Control Point / Setpoint Adjustment (CPATYP)
The control or setpoint can be adjusted using an internal or
external potentiometer connected to the CPA/SPA input (see
Technical Data). The CPA/SPA type is selected by the control
parameter CPATYP (see Technical Data).
Temperature Sensor Calibration (I01CAL, I02CAL
and I03CAL)
In case of an offset resulting from long wiring lengths, the
temperature sensor inputs (I01, I02 and I03) can be adjusted
separately using parameters I01CAL, I02CAL and I03CAL.
OPERATING OVERVIEW
Display and Operation Elements
NOTES: Pressing the + or - button modifies values or scrolls
through the parameter list:
—
One press: single step.
—
Pressing and holding: automatically modifies
value or scrolls through list.
—
After 3 seconds of pressing without release:
speed of modification/scrolling increases.
Changing Operating Modes
After power-up, the controller version is displayed (see
Fig. 9) and the controller enters standard display mode (see
Fig. 10). This mode displays selected input/output values.
NOTE: Although the R7426A,B,C have four control modes
(see Fig. 10), the R7426D controller has only Off and
On. (The On icon is the same as the Occupied icon.)
1
WHEN POWER IS APPLIED, THE
DISPLAY FLASHES MODEL CODE:
1
M17458
Fig. 9. Controller Version.
63-2565
R7426A:
R7426B:
R7426C:
R7426D:
8
Parameter Selection/Adjustment
Use this mode for application configuration:
1. Press and hold the + and - buttons to display parameter
selection mode.
2. Press + until the desired parameter is displayed.
3. Press SET to enter adjustment mode.
4. Use + and - to adjust parameter to desired setting.
5. Return the controller to selection mode using either:
a. SET places the parameter value into the EEPROM.
b. SEL discards the change.
To Display Actual Values
In standard display mode, one of six actual values can be
selected and displayed (see Table 7) by pushing SEL.
FREEZE
OFF
NIGHT
PROTECTION
+
Fig. 10. R7426 display.
Resetting Parameter Values to Default
To reset all parameter values to default (see Tables 9 and 10
for default values):
1. Press and hold the + and - buttons prior to and during
power up.
2. When the display starts flashing dEF , release the buttons.
NOTE: R7426D controllers also have the DefProg (C.23)
parameter. Setting DefProg to 1 resets parameter
values to default.
Time out
After approximately 10 minutes of inactivity (no buttons
pressed) the controller automatically returns to standard
display mode. Inputs not yet confirmed by the SET button are
discarded and old parameter values retained.
Table 7. Standard Displays.
Display
I01
I01
CP.1
Main Setpoint CTRP1
I02
I02
CP.2
Limit/Cascade Setpoint CTRP2
I03
I03
%rh
Humidity Deviation Xwrh
O1
Output 1
O2
Output 2
O3
Output 3
CONTROL MODE
UNOCCUPIED
OCCUPIED
M17462
Description
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