Connecting Pumps; Connecting 3-Port Mixing Valves; Connecting Relays; Smart Flow Sensor - Grant Aerona HPIDR32SMART6 Installation & Operating Instructions Manual

3.5.2 OUTDOOR WEATHER SENSOR
The Outdoor weather sensor is the only external sensor to be
used with the Grant Aerona Smart Controller. It should:
• Be fixed to the coldest wall in the building, usually a north
wall under the roof.
• Not be exposed to direct solar radiation or rain.
• Be fixed on a minimum height of 2m above the ground and
in a distance of at least 1.5m from windows, chimneys and
other heat sources which could interrupt the temperature
measurement.
• Use a connecting cable with a cross section of at least
0.5mm 2 and length of 25m. Polarity of wires is not important.
To fasten the external sensor to the wall.
1. Remove the front of the sensor housing. (Refer to Figure
3-7).
2. Position the rear part of the housing against the wall, mark
and drill fixing holes.
3. Insert the supplied wall plugs, place the housing back into
position and secure in place with the screws.
Screw holes
Cable 2x0.05mm²
Max. Length 25m
Ø cable 3-6.5mm
Figure 3-7: Outdoor weather sensor
3.5.3 TEMPERATURE SENSOR RESISTANCE
The accuracy of the temperature sensors can be checked by
measuring their resistance at a given temperature. In case of
significant differences between measured resistance value and
values in Table below, the sensor should be replaced. (See Table
3-3)
Table 3-3: Temperature/Resistance chart
Water and Outdoor Weather sensors (10kΩ NTC)
o
Temp ( C)
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
100
110
120
3.6

CONNECTING PUMPS

Electrical connections from the circuit pumps to the controller
should be according to the electrical schematics. Refer to Section
4.
Page 10
Screw
2 pcs
Nom (Ω)
175200
96358
55046
32554
19872
12488
8059
5330
3605
2490
1753
1256
915.4
677,3
508,30
386,60
3.7

CONNECTING 3-PORT MIXING VALVES

The Grant Aerona Smart Controller should only be used with
valve actuators equipped with limit switches and the 3-Port mixing
valves can only be fitted as part of an adjustable circuit. Refer to
Appendix C for further details on 3-Port mixing valves.
A water temperature sensor will also need to be installed after the
mixing valve to measure the mixed water flow temperature for the
circuit.
3.8

CONNECTING RELAYS

Relays for Anti-Legionella, defrost assistance & supplementary
heating from a volumiser, low loss header and a DHW cylinder
can be used in conjunction with the Grant Aerona Smart controller.
They are to be connected via H1 (volumiser or low loss header)
or H2 (DHW Cylinder) as these terminals are assigned to specific
functions within the Smart Controller software.
Grant UK supply the Grant Smart Immersion relay as part of our
installation packs. Refer to Appendix D for further guidance on
wiring specifics for Heating Assistance.
3.9

SMART FLOW SENSOR

The Grant smart flow sensor monitors the return flow rate to the
Aerona heat pump to allow calculation of the COP within the
3
Grant Aerona Smart controller. Refer to Appendix E for installation
and configuration requirements.
! NOTE !
Ensure to refer to Appendix E.2 for information on correct
placement of the flow sensor within the installed system.
The Grant smart flow sensor is not required for Grant Aerona 290
heat pump installations.
3.10

ROOM THERMOSTAT CONNECTION

For optimum operation of the Grant Aerona Smart Controller each
circuit within the system should have an individual thermostat
assigned to it.
The room thermostats connect to the wiring centre and can
utilise the weather compensation function to automatically adjust
the flow temperature within the circuit to provide a consistent
room temperature. The required temperature is set on the room
thermostat of the circuit concerned.
It is possible to use the touchscreen as a room thermostat.
3.10.1 ROOM THERMOSTAT WIRING
The Grant Aerona Smart controller can support multiple wired
room thermostats (including the touchscreen display). Ensure that
the correct polarity of the connections are respected when wiring
the room thermostats/touchscreen display in parallel to the wiring
centre. (Refer to Figure 3-8).
With the connections made you will need to pair and assign the
room thermostats with their own address.
See Appendix A for installation and operation guidance.
! CAUTION !
Maximum length of wires should not exceed 30m. This
length may be longer if the wires used have cross-Section
exceeding 0.5 mm .
2
Section 3: Installation