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2.5.2 Grundfos sensors
- Your controller had 2 specials inputs for analogics sensors
GRUNDFOS (Type VFS Flow sensor or RPS pressure
sensor).
The Flow sensor is used for energy measuring and
supervision, the pressure sensor is used only to supervise the
pressure on the primary circuit.
GDS1 (Grundfos Direct Sensor)
Once the line selected press (►) to enter in the submenu
GDS1.
You will have the choice between Flow or Pressure sensor with
different scales.
To choose the type of the sensor connected press (►) to
highlight the line and select your choice with (+) or (-).
- NC Not used
- RPS 0 4 bar Pressure sensor
- RPS 0 6 bar Pressure sensor
- RPS 0 10 bar Pressure sensor
- VFS 1 12l/min Flow sensor
- VFS 2 40l/min Flow sensor
- VFS 5 100l/min Flow sensor
- VFS 10 200l/min Flow sensor
- VFS 20 400l/min Flow sensor
Sensor type: see type plate on the mounted sensor
- Following your sensor choice you can view the
instantaneous values of the temperature, flow or pressure
measured by the sensor.
With Flow sensensor “VFS”,
With Flow sensensor “RPS”,
GDS2 (Grundfos Direct Sensor)
This input has the same function and possibilities of the GDS1
input,
2.5.3 Impulse Flow meter:
If impulse flow meter is installed (on T6 / PF) select “Yes”, then
you must enter with (+) or (-) the flow meter characteristics in
liter / Impulse.
(Adjustable 1 to 25 L/imp with factory value 10 L/imp)
When you use an impulse flow meter for energy measuring,
you must
Connect a temperature sensor (usually T5) mounted on the
collector return piping, to get the correct calculated energy
values.
Important Note:
You must not connect an impulse flow meter to T6, if a digital
pressure or flow sensor is connected to GDS2!
2.5.4 Temperature Sensor
This submenu allows viewing of the current state of all
temperature sensors connected on the controller; you can
immediately see the actual value measured by the sensor, if it
is in use or not & if the sensor is defective.
By pressing on the on the (►) key, you will acced the
calibration of the sensor.
Careful: Check the real value of the sensors with calibrated
thermometer before adjusting. (Calibration range -3 to +3°C
with factory value 0°C)
2.6 Energy measurment:
The controller has two energy measurement blocks. It is
possible to configure for both blocks the sensors which will be
used for energy calculation.
Energy metering calculation logic:
To calculate the energy the controller needs several elements,
two temperature measurement points “Warm” and “Cold”, the
flow value and the heat transfer fluid properties.
 GDS1---- --- -
GDS1 NC
 GDS1---- --- -
GDS1 VFS 1-12 l/min
Flow x.x l/min
Temp GDS1 xxx°C
 GDS1---- --- -
GDS1 RPS 0 - 4 bar
Pressure x.x bar
Temp GDS1 xxx°C
 T6 --- -
Impulse flow meter no
 T6 --- -
Impulse flow meter Yes
Liter/impulse 10
 Inputs Configuration---- -
Temperature sensors
T1 xxx°C
T2 xxx°C
T3 xxx°C
T4 not used
T5 not used
 T1 --- -
Pt1000
Calibration 0°C
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