Temperature Control System WHS HE
Installation and Operating Instructions
15
EN
EN
Sensor operating mode 3: Constant room temperature control with minimum supply air temperature limit
1. Set DIP switches (Pos.
û
) 1 and 4 to Position A and DIP switches 2, 3 and 5 to Position B.
2. Turn the MIN potentiometer (Pos.
ô
) clockwise to the end position.
LED Y1 (Pos.
á
) should light up and the actuator should open the three-way valve.
3. Turn the MIN potentiometer (Pos.
ô
) counter clockwise to the end position.
LED Y2 (Pos.
é
) should light up and the actuator should close the three-way valve.
– After the test
Set the desired control mode via the Dip switches (Pos.
û
) to the correct position (see SS-953).
For constant room temperature control with minimum limit, set the cascade factor CF (Pos.
ê
) and the MIN pot (Pos.
ô
)
to the desired minimum supply air temperature.
For supply air temperature and constant room temperature control, CF (Pos.
ê
) should be set to 1 to ensure stable
regulation.
3�2 Temperature control
The WHSH control system controls the flow temperature to the warm water heater battery with the help of a three
point-valve-actuator. It is controlled by a pulse/break signal in proportion to the control deviation. If the temperature
being controlled approaches the preset setpoint, then the run time of the actuator will reduce and the break time will
increase accordingly.
Three control functions are possible for the temperature control:
1. Constant supply air temperature control with a duct temperature sensor (TFK)
2. Constant room temperature control with an external room temperature sensor (TFR)
3. Constant room temperature control with a minimum supply air temperature limit.
With external room temperature sensor (TFR) and additional duct temperature sensor (TFK).
All three control circuits have an anti-freeze temperature sensor (TFK) behind the WHR
(see wiring diagram SS-953 on page 17 and system diagram on page 2, Fig.1).
Sensor operating mode 3: Constant room temperature control with minimum
supply air temperature limit
Setpoint
Cascade
factor see
manual
91592
Minimum limiter
for duct/supply
air temperature
duct sensor
Frost pro-
tection
TFK duct
sensor
Limiter
TFR room sen-
sor and setpoint
setting
Installation in r
oom
Both TFK and TFR included in delivery
dir
ectly behind the
heating element
(heated side)
Mounted
in supply air duct on
heated side
Installation
+Main
Fig� 20
â
ê
ô
û
áé
ó
ú
â
Setpoint temperature for operation with constant supply air temperature
ê
CF = Cascade factor setting
ô
MIN = Minimum limit
û
Setting/selection of control mode via Dip switches
á
Actuator operating display Y1
é
Actuator operating display Y2
ó
Anti-freeze: LED alarm and reset button
ú
Operating display
