Vector TEF Manual - page 6
PI Thermostat TEF
V1.3a, 20100504
© Vector Controls GmbH, Switzerland
Page 6/8
Subject to alteration
Temperature Control Mode: On/Off control E2=1
On/Off control can be used to operate fan coil valves, reheat or cooling compressor stages.
Outputs used are D OUT 1 for heating, D OUT 2 for cooling.
Control functions:
•
E3: The hysteresis defines when an output is switched on and off again. The aim is to avoid
unnecessary switching and thus increasing the life span of involved equipment as well as saving energy.
Factory setting is 2 K.
•
E6: Enable 4-pipe system. Using a 4-pipe system, both heating and cooling valves are present. It is not
necessary to switch between heating and cooling mode.
•
E7: Fan control: In 2-pipe mode it is possible to control a fan. The fan will run if heating or cooling is
required, in auto mode it will stop when the measured temperature reaches the setpoint. The fan can be
operated even the setpoint is reached by using the LEFT key to activate fan operation in idle mode.
•
P5: Dead Zone Span. The cooling setpoint W
C
consists of the heating setpoint and the dead zone span.
Changing the cooling setpoint in 2-pipe mode therefore changes as well the heating setpoint. The
factory setting for the dead zone span is 1K.
T Room
Temperature
w
H
Setpoint Heating
H
RC
E3:
Hysteresis
Heating/Cooling
w
C
Setpoint Cooling = W
H
+ X
DZ
X
DZ
P5: Dead Zone Span
Analog Control Mode: Positioner
The positioner mode only operates, if the unit is set to PI control mode (E2 = 0).
While programmed to work as positioner the controller will move the actuator to the setpoint position. The
on/off actuator is positioned based on its opening and closing time. The setpoint can either be a percentage
from 0…100% or a step signal from 0…10. (See parameter P10 for details.)
Temperature Control Mode:
The upper status LED lights up red for heating, green for cooling. The number display shows the room
temperature. The point in the lower right corner of the display will indicate 0.5-degree steps. The setpoint is
displayed for 5 seconds if either UP or DOWN buttons are pressed once.
Analog Mode: Positioner
The lower status LED serves as indication for the analog loop. It lights up green if the input matches the
setpoint and red if the input is off target. Pressing UP or DOWN key will display the setpoint. The setpoint is,
depending on parameter P10, a value either from 0…10 or 0…100. Since the display has only 2 digits, 100 is
indicated as A0.
Heating Cooling
100%
0
W
H
T [K]
H
RC
W
C
X
DZ
Y
H,C
[%]