Grant Aerona - Appendix E - Smart Flow Sensor; General; Installation; Electrical

Appendix E: Smart Flow Sensor Page 49
E.1 GENERAL
The Grant Smart Flow sensor is designed to measure the ow
rate within the installed system to determine the power output and
the coe󰀩cient of performance (COP). Over time the function will
also show the running SCOP.
E.2 INSTALLATION
The Grant Smart Flow sensor should be installed in a location that
limits any interference to the measurements given to the Grant
Aerona Smart controller. We recommend the minimum system
pressure to be 1.4 bar to avoid damage from bubble formation
and cavitation. You must take all due care to avoid water
hammers during both installation and normal operation.
! CAUTION !
The sensor in the measuring tube of the Grant Flow sensor
should not be exposed to mechanical loads.
For the optimum measurement accuracy the Grant Aerona Smart
Flow sensor should be installed as per A in Figure E-1. Vertically
with increasing ow allows for the discharge of bubbles upwards
and no danger of dirt or sediment deposits within a completly lled
pipeline.
Position B would be suitable when installing horizontally but
interference from vortices created by bends can occur.
Positon C is unsuitable due to being the top of the circuit and
misreadings from bubbles formation and possible run empty.
Position D would be unsuitable again from possible run empty and
bubble discharge moving back through the ow sensor.
X1
X2
B
B
C
D
B
Flow direction
A
Ensure isolation valves are
set in a fully open position
and not used control ow.
Figure E-1: Smart Flow sensor positioning
Table E-1: Calming Section measurements
Inlet Section (X1) Outlet Section (X2)
Minimum 10x DN Minimum 5 DN
For example, for a pipe diameter of 28mm:
10 x 28mm = 280mm straight pipe before inlet to ow sensor
before any bend or tting
5 x 28mm = 140mm straight pipe after outlet of ow sensor before
any bend or tting.
Appendix E - Smart Flow Sensor
! NOTE !
Changes in pipe diameter should be treated the same as
bends and have suitable calming sections.
The Smart ow sensor should be tted on the return to the
heat pump and be after the Grant Mag One lter, observing the
calming section required for the inlet. When a suitable location
has been determined:
1. Install suitable pipe ttings.
2. Ensure the ow sensor is correctly positioned as shown by
the ow indicator on the outer body.
3. Insert the ow sensor with the O-rings as supplied.
4. Ensure the O-rings are correctly positioned on each end of
the ow sensor before tting the valve union nuts.
! CAUTION !
Avoid over tightening the union nuts and ensure to apply
an equal counter force the union nut by using the hexagon
of the Smart Flow sensor (Maximum torque of 15Nm).
Ensure the electrical connection is pointing upwards or
outwards.
E.3 ELECTRICAL
The Grant Smart Flow sensor is supplied with a pre-wired 5 core
cable and connector.
• Align the connector with the ow sensor, taking note of the
key.
• Insert and secure with the nut. Do not force or overtighten
beyond hand tight.
Refer to Table E-2 and Section 5 pack schematics for wiring
connections.
Table E-2: Smart Flow sensor wire connections
Wire Colour Terminal Connection
Brown (Voltage) +12V (G1 or G4)
White (Not connected) -
Blue (Ground) Terminal 32
Black (Signal) Terminal 31
Grey (Not connected) -
E.4 SENSOR CONFIGURATION
Once installed the Grant Aerona Smart controller will need to be
congured to use the Smart Flow sensor. You will need to access
the ow sensor settings. This is found in service settings (Refer to
Section 8).
Table E-3: Smart Flow Sensor conguration settings
Parameter
Flow Meter Pulse
Specic Heat Capacity 4.180
Time detect(seconds) 120
Time alarm erase(seconds) 30
No ow detection threshold (M
3
/h) 0.1
No ow detection hysteresis (M
3
/h) 0.1
Pulse rate 200
Pulse counting time(seconds) 1
Too often alarm 3