Appendix E - Smart Flow Sensor; General; Installation - Grant Aerona HPIDR32SMART6 Installation & Operating Instructions Manual

APPENDIX E - SMART FLOW SENSOR

E.1

GENERAL

The Grant Smart Flow sensor is designed to measure the flow
rate within the installed system to determine the power output and
the coefficient of performance (COP). Over time the function will
also show the running SCOP.
E.2

INSTALLATION

The Grant Smart Flow sensor should be installed on the return to
the heat pump after the Grant MagOne magnetic filter.
In order to limit interference to the measurements given to the
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, Smart Flow sensor
should be installed as per A in Figure E-1. Vertically with
increasing flow allows for the discharge of bubbles upwards and
no danger of dirt or sediment deposits within a completely filled
pipeline.
Interference from vortices created by bends can occur, so
ensure correct distances from elbows are adhered to for calming
sections when positioning the smart flow sensor. Refer to Table
E-1.
Ensure isolation valves are
set in a fully open position
and not used control ow.
Return to heat pump
Figure E-1: Smart Flow sensor position A
! NOTE !
Changes in pipe diameter should be treated the same as
bends and have suitable calming sections.
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A
Position B (Refer to Figure E-2) would be suitable when installing
horizontally. Ensure adequate calming sections before and after
the flow sensor to avoid vortices and measurement disturbances.
Refer to Table E-1.
Ensure isolation valves are
set in a fully open position
and not used control ow.
Return to heat pump
Figure E-2: Smart Flow sensor position B
Position C is unsuitable due to being prior to a point of decreasing
flow, misreadings from bubbles formation and possible run empty.
Position D would be unsuitable again from being a point of
decreasing flow, possible run empty and bubble discharge moving
back through the flow sensor.
Refer to Figure E-3 for position C & D.
Ensure isolation valves are
set in a fully open position
and not used control ow.
Return to heat pump
Figure E-3: Smart Flow sensor position C & D
Table E-1: Calming Section measurements
Inlet Section (X1)
Minimum 10x DN
For example, for a pipe diameter of 28mm:
10 x 28mm = 280mm straight pipe before inlet to flow sensor
before any bend or fitting
5 x 28mm = 140mm straight pipe after outlet of flow sensor before
any bend or fitting.
Appendix E: Smart Flow Sensor
Flow direction
B
X2 X1
C
D Flow direction
Outlet Section (X2)
Minimum 5 DN