Grant EvoLink User manual

THESE INSTRUCTIONS SHOULD BE READ IN CONJUNCTION WITH THE
INSTALLATION AND SERVICING INSTRUCTIONS SUPPLIED WITH THE
AERONA³ AND ANY OTHER HEATING APPLIANCES USED.
DWG NO: REV:
EVOLINK_FINAL_ASM_V4.asm
18/05/23
DATE:
JOB TITLE:
XXXXXXXXXXX
DRAWING TITLE:REV DISCRIPTION: REV DATE:
UK | DOC 0200 | Rev 1.2 | February 2024
Grant EvoLink
Hybrid System Hub
Installation Instructions

IMPORTANT NOTE FOR INSTALLERS
These instructions are intended to guide installers on the
installation and commissioning of the Grant EvoLink hybrid
system hub, intended for use with a Grant Aerona³ air source heat
pump and other heating appliance. After installing the unit, leave
these instructions with the user.
SPECIAL TEXT FORMATS
The following special text formats are used in these instructions
for the purposes listed below:
! WARNING !
Warning of possible human injury as a consequence of not
following the instructions in the warning.
! CAUTION !
Caution concerning likely damage to equipment or tools
as a consequence of not following the instructions in the
caution.
! NOTE !
Used for emphasis or information not directly concerned
with the surrounding text but of importance to the reader.
GRANT ENGINEERING (UK) LIMITED
Frankland Road, Blagrove Industrial Estate, Swindon, SN5 8YG
Tel: [phone] Fax: [phone]
Email: [email protected] www.grantuk.com
This manual is accurate at the date of printing but will be superseded and should be disregarded if specications and/or appearances are changed in the interests of continued product
improvement. However, no responsibility of any kind for any injury, death, loss, damage or delay however caused resulting from the use of this manual can be accepted by Grant Engineering
(UK) Limited, the author or others involved in its publication.
All good sold are subject to our o󰀩cial Conditions of Sale, a copy of which may be obtained on application.
© Grant Engineering (UK) Limited. No part of this manual may be reproduced by any means without prior written consent.
! NOTE !
These Instructions are based on the
following EvoLink software revisions:
Main PCB: D14
Interface PCB: D13
Product code Serial number identier
EVOLINK 795
PRODUCT CODES AND SERIAL NUMBERS
COVERED
The serial numbers used on Grant EvoLink consist of a fteen
digit numerical code with the nal three digits being the product
identier.
For example:
100000200218795
This serial number can be found on a label attached to the
underside of the bottom casing panel on the right hand side
(immediately below the User interface screen).
These instructions cover the following product codes and serial
numbers:

Contents Page 3
Contents
1 INTRODUCTION 4
1.1 General 4
1.2 How it works 4
1.3 Touchscreen user interface 4
1.4 Product Contents 4
2 TECHNICAL DATA 5
2.1 EvoLink Technical Data 5
2.2 Dimensions 5
3 INSTALLATION 6
3.1 General 6
3.2 Regulations and Standards 6
3.3 Location 6
3.4 Clearances 6
3.5 Metering 6
3.6 System cleaning 6
3.7 Pipe connections 6
3.8 EvoLink installation 7
3.9 Installation procedure 7
4 ELECTRICAL 8
4.1 General 8
4.2 Electrical connections 8
4.3 Electrical supply 9
4.4 Boiler demand 9
4.5 7-Day immersion programmer (legionella) 9
4.6 Aerona³ air source heat pump 10
4.7 Electricity meter 10
4.8 Outdoor air temperature sensor 10
4.9 System return temperature sensor 11
4.10 Supplementary circulating pump 11
4.11 Heating system controls 11
4.12 System wiring diagrams - switch live 12
demand - heating only boiler
4.13 System wiring diagrams - switch live 13
demand - combi boiler
4.14 System wiring diagrams - volt free 14
switching - heating only boiler
5 EVOLINK OPERATION 15
5.1 Introduction 15
5.2 Operation 16
5.3 Manual override operation 17
5.4 Diagnostic screen 17
5.5 EvoLink parameters 18
6 COMMISSIONING 19
6.1 General 19
6.2 Aerona³ air source heat pump 19
6.3 EvoLink user interface 19
6.4 Parameter settings 20
6.5 Override function 21
6.6 User interface display screen 22
6.7 Grant EvoLink settings 23
6.8 Weather compensation settings 24
7 DECLARATION OF CONFORMITY 25
7.1 EC Declaration of Conformity 25
7.2 UKCA Declaration of Conformity 26
8 HEALTH AND SAFETY 27
INFORMATION
8.1 General 27
8.2 Insulation materials 27
8.3 Sealant and adhesive 27
9 GUARANTEE 28
NOTES 30

Section 1: IntroductionPage 4
1.1 GENERAL
The Grant EvoLink is a unique means of utilising a Grant Aerona³
air source heat pump with an existing wet domestic heating
system, where a heat pump alone would be unable to meet the
design heat demand of the property.
Used in conjunction with the existing gas, oil-red, LPG, electric or
biomass* boiler, the EvoLink allows the end user to benet from
the highly e󰀩cient, low carbon operation of an Aerona³ heat pump
to provide space heating and hot water for a large part of the year,
with the boiler used only as a supplementary heat input to assist
the heat pump during colder periods.
In warmer times, the higher outdoor temperatures reduce the heat
demand of the property allowing this to be met with lower water
ow temperatures in the heating system that may be met by the
heat pump alone or with a contribution from the boiler.
The Grant EvoLink control system both determines the required
ow temperature, using weather compensation, and controls
how it is achieved either with the heat pump alone or with some
contribution from the boiler.
Using the boiler as a supplementary heater in this way, under
the control of the Grant EvoLink, allows the existing heating
system to be retained. However Grant advise that a range of
measures should be considered to reduce dependency on the
boiler and maximise the use of the heat pump. These can be
implemented when the EvoLink is installed, or in stages following
the installation to spread the cost involved.
These measures would include, where applicable, reducing the
building heat loss by improving the building insulation, tting or
improving double glazing, etc. and improving the e󰀩ciency of the
heating system by resizing radiators and pipework such that the
heat demand can be met with a maximum ow temperature of
55°C.
The Grant EvoLink has a maximum output to the system of 32kW
and is suitable for use with boilers of up to 36kW output or, in
the case of Combi boilers, an output to space heating of 36kW.
Where this output exceeds 26kW, the ow and return pipework
between the boiler and the EvoLink should be in 28mm pipe for
anything other than very shortest ow and return pipe lengths.
This is to reduce pressure loss and avoid pipe noise due to an
increased water velocity in the pipework.
The Grant EvoLink is enclosed in a wall mounted casing with a
removable front panel and is designed to be installed internally.
1.2 HOW IT WORKS
The Grant EvoLink control system allows an Aerona³ air-to-water
inverter driven air source heat pump to be used in conjunction
with an existing gas or oil-red domestic heating boiler on an
existing domestic heating system. This includes standard, system
and combi boilers.
Both the heat pump and boiler are controlled by the EvoLink in
response to either a space heating or hot water demand from the
heating system controls.
1.2.1 SPACE HEATING
The EvoLink operates to produce space heating and can be
weather compensated with the compensation curve parameters
set via the touchscreen user interface. Refer to Section 6 –
Commissioning for details on the weather compensation settings.
The Grant EvoLink is supplied with an outdoor air temperature
sensor. This must be connected to the EvoLink control PCB for
the weather compensation function to operate, refer to Section 4 –
Electrical for details on how this must be connected.
Whilst the ‘Heating Setpoint’ (i.e., the maximum water ow
temperature required to meet the heat demand at design
conditions) must be set on the touchscreen user interface, (with
the weather compensation set and enabled), the EvoLink control
will automatically determine the required water ow temperature
to meet the heat demand of the property at the prevailing outdoor
air temperature.
1 Introduction
As the outdoor air temperature changes, so will the heat demand
and thus the required ow water temperature, up to the maximum
‘Heating Setpoint’ value.
The EvoLink control system uses the heat pump and, when
necessary, the boiler to achieve the weather compensated water
ow temperature.
1.2.2 HOT WATER
In response to a hot water demand, the EvoLink control system
will immediately switch to providing the water ow temperature
at the ‘Hot Water Setpoint’ value, as set on the touchscreen user
interface.
Section 6 - Commissioning for details of the heating and hot
water setpoint settings.
Note that there is no weather compensation control for the water
ow temperature when the EvoLink is operating in response to a
hot water demand.
If the EvoLink is operating in response to a heating demand when
a demand for hot water operation occurs, the control system
will immediately stop the heating operation and switch to hot
water operation, i.e., switch from a weather compensated ow
temperature to the xed setpoint set for hot water.
1.3 TOUCHSCREEN USER INTERFACE
The EvoLink touchscreen user interface is factory tted inside the
EvoLink enclosure, visible through an opening in the front casing
panel where the user can easily access it to view the display and,
when necessary, operate the manual override function.
The EvoLink touchscreen user interface is designed to be used to:
• Set the EvoLink operating mode, temperatures, and
parameters.
• Display which demand is present (space heating or hot
water)
• Display whether the heat pump or boiler (or both) are
operating.
• Display the electricity consumed by the heat pump.
• Display the percentage time the heat pump and boiler have
operated for.
• Access the diagnostic features of the EvoLink control system.
• Display real time data including ow, return and outside
temperatures.
For further details on the use of the touch-screen user interface,
refer to section 6 - Commissioning.
1.4 PRODUCT CONTENTS
The Grant EvoLink is supplied already fully assembled in a carton
which is carefully packed with packing materials.
Table 1-1: Product contents
Quantity Item
1 EvoLink unit
1 Wall mounting plate
1 Outdoor temperature sensor
1System return temperature sensor/lead
1 Temperature sensor clip 28mm
1 Installation instructions
* Automatic modulating biomass boilers only.

Section 2: Technical Data Page 5
2.1 EVOLINK TECHNICAL DATA
2 Technical Data
Figure 2-1: EvoLink Dimensions
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DATE:
JOB TITLE:
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DRAWING TITLE:REV DISCRIPTION: REV DATE:
629
11
52
566
82
123
63
123
229
372
425
1 2 3 4 5
(See below for pipe details)
491
276
Table 2-2: EvoLink connections
No. Connection Size
1Boiler ow 22mm
2 Boiler return 22mm
3Heat pump ow 28mm
4 System return 22mm
5System ow 28mm
2.2 DIMENSIONS
Table 2-1: EvoLink technical data
Property Value
Weight - empty 29kg
Weight - full 38kg
Water content 9 litres
Power supply 230V~ 1ph 50Hz
Connections - heating system 28mm copper
Connections - heat pump 28mm copper
Connections - boiler 22mm copper
Circulating pump 7m head

Section 3: InstallationPage 6
3 Installation
3.1 GENERAL
This section gives details of the installation process for the Grant
EvoLink.
These installation instructions must be read in conjunction with:
• The Grant Aerona³ air source heat pump installation
instructions (provided with the unit).
• The installation instructions for the boiler.
Before starting to install the Grant EvoLink, please read the Health
and Safety information given in Section 8 of these installation
instructions.
Similarly, before staring any installation work on the Grant
Aerona³ air source heat pump, please read the Health and
Safety information given in Section 14 of the Aerona³ installation
instructions.
3.2 REGULATIONS AND STANDARDS
The installation of the Grant EvoLink, the Grant Aerona³ air source
heat pump and the existing boiler must be in accordance with the
following recommendations, as applicable:
• Building Regulations for England and Wales, and Building
Standards for Scotland
• Local Bylaws (check with the Local Authority for the area)
• Water Supply (Water Fittings) Regulations 1999
• MCS Installer Standards (if applying for the Renewable Heat
Incentive)
MIS3005-D The heat pump Standard (Design)
MIS3005-I The heat pump Standard (Installation)
MCS020 MCS Planning Standard
The installation should also be in accordance with the latest
edition of the following standards and Codes of Practice:
• BS7671 and amendments
• BS EN 12831
3.3 LOCATION
The Grant EvoLink is enclosed in a wall mounted casing designed
to be installed internally.
The wall onto which the EvoLink is to be xed must be at,
vertical and of a suitable construction rm enough to support the
weight of the unit.
Do NOT install the EvoLink in any of the following locations:
• In damp conditions within the property, e.g. any locations
subject to steam and condensation such as a bathroom.
• In a position subject to heat, e.g. above a boiler, cooker, or
radiator or where it will be in direct sunlight.
• Where it can be reached and tampered with by children.
The EvoLink must be positioned such that there are su󰀩cient
clearances all round it for installation, maintenance and to
allow the front cover to be removed. Refer to subsection 3.4 -
Clearances.
3.4 CLEARANCES
The minimum clearances given below must be used to enable the
EvoLink to be easily commissioned, serviced, and maintained.
Sides: 30mm
Above: 50mm
Below: 300mm
In front: 600mm
3.5 METERING
In order for the EvoLink touchscreen user interface to display the
electrical consumption of the heat pump (in kWh), an electricity
meter must be installed in the electrical supply to the heat pump.
Refer to Section 4.7 for details on the connection of an electricity
meter.
3.6 SYSTEM CLEANING
! CAUTION !
Grant recommends that the existing system be thoroughly
cleaned prior to commencing the installation of the Grant
EvoLink.
For optimum performance, and to avoid the danger of dirt and
foreign matter entering the EvoLink and Aerona³ air source heat
pump, the complete heating system should be thoroughly ushed
out before starting the EvoLink installation.
This should be carried out in accordance with the guidelines given
in BS 7593 ‘Treatment of water in domestic hot water central
heating systems’. This must involve the use of a proprietary
cleaner, such as Sentinel X300 or X400 or Fernox Restorer.
Grant also strongly recommends that a Grant MagOne in-line
magnetic lter (or equivalent*) is tted in the heating system
return pipework when the EvoLink is installed. This should
be installed and regularly serviced in accordance with the
lter manufacturer’s instructions.
*As measured by Gauss. The Grant MagOne magnetic lter has a
Gauss measurement of 12000.
3.7 PIPE CONNECTIONS
The Grant EvoLink is supplied with the following ve pipe
connections protruding vertically downwards through the casing
base panel – refer to Section 2.2 – Dimensions.
These connections are as follows – from left to right (viewed from
the front of the EvoLink):
• Boiler ow connection – 22mm copper
• Boiler return connection – 22mm copper
• heat pump ow connection – 28mm copper
• Heating system return connection – 22mm copper
• Heating system ow connection – 28mm copper

Section 3: Installation Page 7
3.8 EVOLINK INSTALLATION
Remove the Grant EvoLink from its packaging and place it back
panel downwards, on a clean at level oor, and prepare it for
installation as follows:
• Remove the front casing panel with it laying on its back.
Unscrew and remove the three screws on the underside of
the front casing panel and lift the bottom-edge of the front
panel and slide towards the top of the unit and lift it o󰀨.
• Remove the wall xing plate from the packaging.
• Position the wall xing plate on the wall where the EvoLink is
to be installed with the outward facing edge at the top.
To ensure that the nal position of the EvoLink is as required,
position the wall xing plate as follows (Refer to Figure 3-1):
Top edge of wall xing plate:
2mm below the top surface of EvoLink casing (or
14mm from top edge of ange).
End of wall xing plate:
61mm in from side surface of EvoLink casing.
• Connect the ow from the Aerona³ air source heat pump to
the correct pipe connection on the EvoLink. Refer to Section
2.2 and Figure 5-1.
• Connect the return to the heat pump directly to the system
return.
• Fit manual or automatic air vents at the highest point of both
ow and return pipework.
• With the electrical supply still isolated, connect the electrical
supply, heating system controls, and electrical controls
connection to the Aerona³ air source heat pump. Refer to
Section 4 of these instructions.
• Fill and vent the heating system and check for leaks. Refer
to the Aerona³ air source heat pump installation instructions
for details of the requirements for anti-freeze protection and
prevention of biological growth.
• Commission the EvoLink installation as detailed in Section 6
of these instructions.
Figure 3-1: Upper and side dimensions between the EvoLink and
the bracket
14
61
Boiler
Bracket
61
2
• Using a spirit level, check the wall mounting plate is level and
use it as a template to mark the centres of the three xing
holes on the wall.
• Remove the mounting plate from the wall. Drill and t suitable
wall plugs for the type of wall construction concerned then
securely x the wall mounting plate to the wall using three
suitable screws and check again it is level.
• Lift the EvoLink into place on the wall, ensuring that the top
rear of the EvoLink back panel is correctly located into the
wall mounting plate.
It may be necessary to slide the EvoLink to one side or
another on the wall mounting plate, to position it exactly
as required on the wall. There is approx.73mm of lateral
adjustment available.
• Connect the pipework to the ve pipe connections projecting
below the base panel. Refer to Section 3.7 for details.
3.9 INSTALLATION PROCEDURE
• Thoroughly ush the existing heating system and boiler.
• Switch o󰀨 existing heating system and isolate electrical
supply to the controls and boiler.
• Fully drain down the existing heating system.
• Disconnect the boiler from heating system controls.
• Disconnect the ow and return connections from the existing
boiler.
• Install the Grant EvoLink unit on the wall in the chosen
position, having carefully considered the location. Refer to
Section 3.8 - EvoLink installation.
• Connect the ow and return from the existing boiler to the
correct pipe connections on the EvoLink. Refer to Section 2.2
and Figure 5-1.
• Fit a Grant MagOne in-line magnetic lter (or equivalent) in
the heating system return pipework.
• Connect the existing heating system ow and return to the
correct pipe connections on the EvoLink. Refer to Section 2.2
and Figure 5-1.
• Install the Aerona³ air source heat pump in accordance with
the installation instructions supplied with the unit.

Page 8 Section 4: ElectricalPage 8
4 Electrical
! WARNING !
Electric shock may cause serious personal injury or death.
All electrical work must be undertaken by a competent
person.
Failure to observe this legislation could result in an unsafe
installation and will invalidate all guarantees.
All electrical connections made on-site are solely the
responsibility of the installer.
4.1 GENERAL
The Grant EvoLink requires a 230V 50Hz single phase electrical
supply fused at 5 amps.
All the controls and wiring, with the exception of the external
temperature sensor and system return sensor, are contained
within the EvoLink casing. The control PCB is located inside an
electrical enclosure located on the base panel inside the EvoLink
casing.
4.2 ELECTRICAL CONNECTIONS
Most of the electrical connections are made to one of the three
terminal blocks located just below the EvoLink control PCB. The
connections for the electricity meter and supplementary circulating
pump (if tted) are made to terminal blocks mounted directly on
the EvoLink control PCB. Refer to Figure 4-1.
Figure 4-1: EvoLink Control PCB and terminal blocks
Starting with the 7-way Main voltage terminal block to the lower
left of the PCB, and going anticlockwise around the PCB, the
connections are as follows:
1. Mains voltage terminal block – electrical supply and CH, HW
and supplementary demands to the EvoLink.
2. Supplementary heat demand volt-free terminal block.
3. Low voltage terminal block - volt-free connections to
Aerona³ heat pump terminal PCB and temperature sensor
connections
4. Touchscreen user interface connection block - pre-wired to
user interface from factory.
5. Aerona³ heat pump connection block - pre-wired to terminal
block 3 from factory.
6. Electricity meter connection block
7. Outdoor air temperature sensor connection block - pre-wired
to Low voltage terminal block 3 from factory.
8. Boiler demand connection block - pre-wired to terminal block
2 from factory.
9. Supplementary circulating pump connection block.
10. Space heating/hot water/supplementary demand pre-wired to
Mains voltage terminal block 1 from factory.
To access the 3 terminal blocks and control PCB, to make the
electrical connections, proceed as follows:
Remove the front casing panel. To do this, unscrew and remove
the three screws on the underside of the front casing panel and lift
the panel upwards.
The control PCB enclosure is located at the lower front of the
EvoLink on the bottom casing panel.
GRANT
5v Rx Tx 0v
EvoLink PCB
L
N
LN
E
+-
NO1
NO2
C1
C2
SUPP
DMD
HW
DMD
CH
DMD
Brown Green/ /yellow Blue
Red Black
Yellow
Red Red Orange White Orange White Yellow Yellow
Drawing Title: EvoLink PCB connection points (DRAFT)
Drawing Set: EvoLink
Status: Approved
Rev Date: 16/10/23 Drawn By: AC Checked By: PS
Dwg. No. EVO1
Revision: 2.7
This drawing and its content is subject to copyright. Use other than for its original intended purpose must be arranged with an employee of Grant UK Ltd.
Frankland Road, Blagrove Industrial Estate, Swindon, Wiltshire, SN5 8YG, tel; 01380 736920
Scale: 1 : 1
Paper Size: A4
Notes:revision details:
2.7 16/10/23
SUPP Heat
Demand Volt Free
1 2 3
4
5
6
7
8
9
10
Link
SUPP
DMD
HW
DMD
CH
DMD
L E N N
Mains Voltage Terminal Block Low Voltage Terminal Block
DHW
HP DMD VOLT FREE
18
DHW
19
CH
20
CH
21 Outside Air
Temp
Outside Air
Temp
HP Return
Temp
HP Return
Temperature
SUPP Heat
Demand Volt Free
SUPP
DMD
HW
DMD
CH
DMD
L E N N
Mains in 230 V AC

Page 9Section 4: Electrical Page 9
Unscrew and remove the two screws on the lower front of the
PCB enclosure cover. Lift the cover up at least 15mm and remove
it from the enclosure.
4.3 ELECTRICAL SUPPLY
The 230V 50Hz electrical power supply is connected to the 7-way
Mains voltage terminal block, located to the lower left of the PCB.
See Figure 4-1, Item 1.
Route the power supply cable through the left-hand grommet on
the underside of the EvoLink casing and up through the left hand
cable clamp into the control PCB enclosure.
Connect the power supply to the 7-way terminal block as follows:
• Live – Terminal L
• Earth – Terminal E
• Neutral – Terminal N
The terminal identication is shown on a label immediately below
this terminal block.
4.4 BOILER DEMAND
The two terminals marked "Supp Heat Demand" on terminal
block 2 (see Figure 4-1) are connected across the ‘volt free’ boiler
control relay on the EvoLink control PCB. This relay can be used
in either of two di󰀨erent ways, depending on how the existing
boiler operates.
Switched live demand
For a boiler that requires a 230V ‘switched live’ demand – usually
from a heating or hot water 2-port zone valve (i.e. the orange
wire output from the zone valve motor), the relay can be used to
provide a switched live output whenever the EvoLink requires the
boiler to re.
For this application a link MUST be tted by the installer between
terminal L (on Mains voltage terminal block 1) and LEFT HAND
"Supp Heat Demand" terminal on terminal block 2.
The switched live connection on the boiler must be connected
to the RIGHT HAND " Supp Heat Demand" terminal on terminal
block 2. The terminals on terminal block 2 are factory wired to the
'volt free' boiler control relay on the EvoLink PCB so that when
this relay closes there is a switched output to the boiler.
Route the cable from the boiler back to the EvoLink, through the
left hand grommet and left hand cable clamp on the inside of the
EvoLink control PCB enclosure.
Refer to Section 4.12 & 4.13 for switched live wiring diagrams.
Volt free demand
For a boiler that requires a ‘volt free’ contact to close, to create a
demand for heating or hot water, the relay can be used to provide
this ‘volt free’ switching.
Connect the 'volt free' connection from the boiler to the two
terminals on the left hand side of terminal block 2. The terminals
on terminal block 2 are factory wired to the 'volt free' boiler control
relay on the EvoLink PCB so that when this closes, the volt free
switching starts the boiler.
4.5 7-DAY IMMERSION PROGRAMMER
(LEGIONELLA)
A timeswitch is available to purchase from Grant UK (Grant UK
product code: HPIDT205) for the purpose of setting the ON/OFF
times for the Legionella sterilisation Regime.
This system uses the existing cylinder immersion heater which is
switched via the timeswitch (to be mounted next to the cylinder).
The immersion element can be programmed to operate for the
required period on either a daily or weekly basis. Refer to Aerona³
installation instructions Section 5.3 for details on Legionella
sanitisation regimes.
Once set, this system is fully automatic but can be overridden by
the user if required. Also, the user can still switch the immersion
element o󰀨 via the double pole isolation switch incorporated into
the design of the programmer, irrespective of the programmer or
cylinder thermostat setting or whether the heat pump is operating.
4.5.1 INSTALLATION
The Greenbrook T205-C timer comes ready for installation. The
connections to the Immersion heater power supply and Immersion
heater must be made after it is installed on site.
When installed, this programmer interrupts the electrical supply
between the existing immersion heater power supply and
immersion heater. Refer to Aerona³ installation instructions
Section 5.4 for electrical connection details.
This timer incorporates a boost function which can be used to
rise the temperature of the DHW cylinder to the 'HOT WATER
SETPOINT'
! NOTE !
If using the volt free demand option, do NOT t a link
between terminal L (on Mains voltage terminal block 1) and
either of the "Supp Heat Demand" terminals on terminal
block 2.
Route the cable from the boiler back to the EvoLink through the
right hand grommet and right hand cable clamp on the inside of
the EvoLink control PCB enclosure.
Refer to Section 4.14 for volt free switching wiring diagrams.
! WARNING !
Where a 3-phase supply is present, ensure that BOTH
the immersion heater power supply and heating system
controls are taken from the same phase. If in doubt,
contact a qualied electrician.
For more detailed information on the installation of the
Greenbrook T205-C 7-day immersion programmer, please refer to
the instructions supplied with the programmer.
! NOTE !
The Greenbrook T205-C immersion heater timer
incorporates a double pole isolation switch and a 13 Amp
fuse into its design.
4.5.2 SETTING
For detailed information on setting the Greenbrook T205-C 7-day
immersion programmer, please refer to the instructions supplied
with the programmer.

Page 10Page 10
4.6 AERONA³ AIR SOURCE HEAT PUMP
! CAUTION !
The Grant Aerona³ air source heat pump should be
installed in accordance with the installation instructions
supplied with the unit, including connection of the power
supply.
However, please disregard Sections 6.8, 6.9 and 6.10 of the
Aerona³ heat pump instructions and refer instead to the
guidance given in this section for the connection of the
heat pump and heating system controls.
The control connection between the EvoLink and the Aerona³ heat
pump is low voltage so it does not require electrical qualications
to install, but ensure that technical standards for electrical
equipment are followed.
! NOTE !
A Grant heat pump interface box (such as a Grant EP001
wiring centre or EP002 interface) is NOT required when
connecting the Aerona³ heat pump to the EvoLink.
The Aerona³ heat pump remote controller (supplied with
the Aerona³ heat pump) MUST still be connected. Refer to
Section 6 of the Aerona³ heat pump installation instructions
for further details.
The 3-wire control connection from the Aerona³ heat pump is
connected to the terminals on the right hand terminal block – refer
to Figure 4-1 located below the right corner of the EvoLink PCB.
To connect the Aerona³ heat pump to the EvoLink, proceed as
follows:
1. Remove the wiring cover at the righthand end of the heat
pump to access the Terminal PCB. Refer to Section 6.1 of the
Aerona³ heat pump installation instructions for further details.
2. Connect the cable to the terminal block on the Terminal PCB,
as follows:
• Terminal 18 (Common) – Red wire
• Terminal 19 (Hot water) – Yellow wire
• Terminal 20 (Heating) – Blue wire
3. Route the cable from the Aerona³ heat pump back to the
EvoLink, through the right hand grommet and cable clamp in
the EvoLink control PCB enclosure.
4. Connect the cable to the terminal block on the EvoLink as
follows:
• Terminal 20 (Heating) – Blue wire
• Terminal 18 (Common) – Red wire
• Terminal 19 (Hot water) – Yellow wire
• Terminal 21 (Common) – t link to terminal 18
Refer to the wiring diagrams in Sections 4.12 - 4.14 of these
installation instructions.
4.7 ELECTRICITY METER
In order for the EvoLink touchscreen user interface to display the
electrical consumption of the heat pump (in kWh) an electricity
meter must be installed in the electrical supply to the heat pump.
To be suitable for this application, the meter must have a pulsed
output (1 pulse/Wh).
The connection between the EvoLink and the pulsed output
connections on the meter is low voltage so it does not require
electrical qualications to install, but ensure that technical
standards for electrical equipment are followed.
Use 1.0mm² CSA 2-core cable or similar.
This connection is made to the green 2-way terminal block – item
6 on Figure 4-1 (marked as CON18 on the PCB) located at the
top right-hand corner of the PCB.
Connection
Connect the meter to the PCB terminal block as follows:
1. Remove the terminal cover from the electricity meter and
locate the two ‘pulse output’ terminals. These terminals are
marked + and - on the meter.
2. Connect one wire to the + terminal and the other to the -
terminal. Note the colour of the wire to each connection.
3. Route the cable from the meter back to the EvoLink, through
one of the cable clamps on the underside of the EvoLink
casing and up through one of the grommets into the control
PCB enclosure.
4. Connect one wire to the + terminal of the green 2-way
terminal block on the PCB. Check it is the same colour wire
connected to the + terminal at the meter.
5. Connect the other wire to the - terminal of the green 2-way
terminal block on the PCB.
4.8 OUTDOOR AIR TEMPERATURE SENSOR
The outdoor air temperature sensor uses a 10kΩ thermistor to
provide an accurate measurement of the outdoor air temperature.
It is supplied tted inside a small weatherproof enclosure for wall
mounting outside the property.
The outdoor air temperature sensor must be installed and
connected to the control PCB in order for the EvoLink weather
compensation function to operate.
Location
The outdoor air temperature sensor should be located in the close
vicinity of the Aerona³ heat pump in order that the temperatures
sensed by both this sensor and the heat pump air temperature
sensor are the same, or very close in value.
The outdoor air temperature sensor can be mounted directly onto
an external wall, but positioned so that it is not in direct sunlight at
any time.
It should be positioned at a height that prevents accidental
damage or tampering.
In order to prevent heat transmitted through the wall a󰀨ecting the
sensor reading, it may be necessary to t an insulating barrier
between the sensor enclosure and the wall, or plug any cable
conduit passing through the wall with insulation.
Installation
To mount the outdoor air temperature sensor on the wall, proceed
as follows:
1. Unscrew and remove the four screws and remove the front
cover from the sensor enclosure.
2. Position the enclosure against the wall in the required
position (with the cable gland pointing in the required
direction) and mark the position of the two xing holes on the
wall.
3. Remove the enclosure from the wall, drill and x the
enclosure to the wall using suitable xings.
4. Ensure that the cable gland is pointing in the required
direction.
Section 4: Electrical

Page 11Page 11
Connection
The connection between the EvoLink and the outdoor air
temperature sensor is low voltage so it does not require electrical
qualications to install, but ensure that technical standards for
electrical equipment are followed.
A two-core cable is required to connect the sensor to the EvoLink
terminal block. Two cores of a multi core alarm cable can be used
but it must have a minimum external diameter between 3 and 6.5
mm to ensure a watertight seal at the cable gland.
To connect the outdoor air temperature sensor to the EvoLink
proceed as follows:
1. Pass the cable through the gland in the sensor enclosure.
2. Connect to the two wires to the two terminals of the sensor
terminal block. There is no polarity so the wires can be
connected to either terminal.
3. Re-t the cover using the four screws ensuring a weathertight
seal between the cover and enclosure.
4. Route the cable from the outdoor air temperature sensor
back to the EvoLink, through the right hand grommet and
cable clamp on the inside of the EvoLink control PCB
enclosure.
The cable is connected to the two Outside Air Temp Sensor
terminals on the Low voltage terminal block 3 located at the lower
right of the EvoLink control PCB – refer to Figure 4-1.
There is no polarity, so the wires can be connected to either
terminal on both the sensor and terminal block.
4.9 SYSTEM RETURN TEMPERATURE
SENSOR
Location
The system return temperature sensor, supplied with the EvoLink,
should be located on the return pipe from the system BEFORE
the point where it branches o󰀨 to the return connection to the
EvoLink. Refer to Figure 5-1.
The sensor should be secured to the return pipe using the 28mm
spring clip provided with the EvoLink.
The temperature sensor must be in contact with the surface of the
pipe. Pipe insulation should be placed over the sensor to reduce
the e󰀨ects of air currents on the sensor measurement.
Connection
The connection between the EvoLink and the system
return sensor is low voltage, so it does not require electrical
qualications to install, but ensure that technical standards for
electrical equipment are followed.
To connect the system return temperature sensor to the EvoLink
proceed as follows:
1. Route the sensor lead back to the EvoLink, through the right
hand grommet and cable clamp on the inside of the EvoLink
PCB enclosure.
2. Connect the two wires to the two HP Return Sensor terminals
on the Low voltage terminal block 3 located at the lower right
of the EvoLink control PCB - refer to Figure 4-1.
There is no polarity so the wires can be connected to either
terminal on the sensor and terminal block.
The sensor lead provided is 2.5m long. This can be extended if
necessary using a suitable cable, e.g. alarm cable.
Section 4: Electrical
4.10 SUPPLEMENTARY CIRCULATING PUMP
Required when the boiler does not have an integral pump, e.g.
a standard 'heating only' boiler (not a system boiler or Combi
boiler), where the circulating pump is located somewhere else on
the system pipework.
A 230V 50Hz output is available to operate the pump whenever
there is a demand from the 'Supplementary Boiler Demand'
terminals (on terminal block 2) for the boiler to operate.
The supplementary circulating pump is connected to the 2-way
green terminal block – item 9 on Figure 4-1 (marked as CON8 on
the PCB) located at the top left of the EvoLink control PCB.
Connection
Route the cable from the supplementary circulating pump back to
the EvoLink, through the left hand grommet and cable clamp on
the inside of the EvoLink control PCB enclosure.
Connect the power supply as follows:
• Live – Terminal L (the lower of the two terminals on terminal
block – CON8)
• Neutral – Terminal N (the upper of the two terminals on
terminal block – CON8)
• Earth – Terminal Earth (on left-hand terminal on terminal
block – CON20)
The terminal identication is printed on the PCB next to the
terminal blocks.
4.11 HEATING SYSTEM CONTROLS
The heating system controls are connected to the 'CH DMD'
and 'HW DMD' terminals on the Mains voltage terminal block 1,
located to the lower left of the PCB - Refer to Figure 4-1.
Connect the control system outputs as follows:
Space heating demand - to terminal marked CH DMD on the
terminal block. Domestic hot water demand - to terminal marked
HW DMD on the terminal block.
If required, any supplementary demand is made to the 'SUPP
DMD' terminal on the Mains voltage terminal block 1.
Route the cable from the system controls wiring centre, back to
the EvoLink, through the left hand grommet and cable clamp on
the inside of the EvoLink control PCB enclosure.

Page 12Page 12
4.12 SYSTEM WIRING DIAGRAMS - SWITCHED LIVE DEMAND- HEATING ONLY BOILER
Figure 4-2: EvoLink System Wiring Diagram - S-Plan type system - switched live demand - heating only boiler
Section 4: Electrical
Scale: NTS
Paper Size: A3
Project Title: EvoLink S-Plan Wiring Diagram
Switched Live Boiler operation
Drawing Set: EvoLink Wiring Diagrams
Status: Approved
Rev Date: Drawn By: AC Checked By: NS
Dwg. No. EVOWD01
Revision: 3.3
This drawing and its content is subject to copyright. Use other than for its original intended purpose must be arranged with an employee of Grant UK Ltd.
Blagrove Industrial Estate, Swindon, Wiltshire, SN8 5YG, tel; 01380 736920
Notes: Some Neutral and Earth connections
have been excluded for clarity.
Revision Details:
3.3 Approved
Outdoor air
temp sensor
2
Digital
Dual Thermostat
L N C1
CH1CH2CH3
CH4N L
Grant HPIDTM4
DHW Timer
Grey
Black
Blue
Brown
L N E
230V
50HZ
5A
1 2 345 6 78 9 10
Wiring Centre
Frost
Stat
Pipe Stat
(If fitted)
Brown
Blue
Green/Yellow
11 12
2-Port Zone Valve
(DHW)
HW
Motor
Blue
Green/Yellow
Brown
L
N
A1A2RT1RT2 -
Link
Grant NeoStat
Programmable Room
Thermostat
2-Port Zone Valve
(Space Heating)
HTG
Motor
Blue
Green/Yellow
Brown
Orange
Grey Orange
Grey
Supplementary
Heating Appliance
(Boiler)
L N E SL
kWh
+ -
1 2 3 4
Electricity
meter
Optional additional
circulating pump
L N E
Link Link Link
17
18
19
20
21
22
23
24
25
1
2
3
4
5
6
7
8
Link
ASHP Terminals
Hot Water (Yellow)
Common (Red)
Heating (Blue)
L N
ASHP Side Terminal
N1 2 3
Do Not Use
L
E
From
lockable
isolator
15/12/23
15/12/23
N
13 14 15 16
Hot Water
Priority Relay
Link
SUPP
DMD
SUPP
DMD
GRANT
5v Rx Tx 0v
EvoLink PCB
L
N
LN
E
+-
NO1
NO2
C1
C2
SUPP
DMD
HW
DMD
CH
DMD
Link
SUPP
DMD
HW
DMD
CH
DMD
L E N N
Mains Voltage Terminal Block Low Voltage Terminal Block
DHW
HP DMD VOLT FREE
18
DHW
19
CH
20
CH
21 Outside Air
Temp
Outside Air
Temp
HP Return
Temp
HP Return
Temperature
Link
SUPP Heat
Demand Volt Free
SUPP Heat
Demand Volt Free
SUPP
DMD
HW
DMD
CH
DMD
L E N N
Mains in 230 V AC
From
lockable
isolator

Page 13Page 13
4.13 SYSTEM WIRING DIAGRAMS - SWITCHED LIVE DEMAND - COMBI BOILER
Section 4: Electrical
Figure 4-3: EvoLink System Wiring Diagram - S-Plan type system - switched live demand - combi boiler
Scale: NTS
Paper Size: A3
Project Title: EvoLink Wiring Diagram
Combi boiler - Switched live operation
Drawing Set: EvoLink Wiring Diagrams
Status: Approved
Rev Date: 15/12/2023 Drawn By: AC Checked By: NS
Dwg. No. EVOWD04
Revision: 1.9
Revision Details:
1.9 Approved15/12/23
Outdoor air
temp sensor
1 2 345 6 78 9 10
Wiring Centre
Frost
Stat
Pipe Stat
(If fitted) 11 12
Supplementary
Heating Appliance
(Combi Boiler)
L N E SL
Link Link Link
This drawing and its content is subject to copyright. Use other than for its original intended purpose must be arranged with an employee of Grant UK Ltd.
Blagrove Industrial Estate, Swindon, Wiltshire, SN8 5YG, tel; 01380 736920
kWh
+ -
1 2 3 4
Electricity
meter
17
18
19
20
21
22
23
24
25
1
2
3
4
5
6
7
8
ASHP Terminals
Heating
Common
Notes: Some Neutral and Earth connections
have been excluded for clarity.
Optional additional
circulating pump
L N E
SUPP Heat
Demand Volt Free
SUPP Heat
Demand Volt Free
Link
GRANT
5v Rx Tx 0v
EvoLink PCB
L
N
LN
E
+-
NO1
NO2
C1
C2
SUPP
DMD
HW
DMD
CH
DMD
Link
SUPP
DMD
HW
DMD
CH
DMD
L E N N
L E N N
Mains Voltage Terminal Block
Mains in 230 V AC
Low Voltage Terminal Block
DHW
HP DMD VOLT FREE
18
DHW
19
CH
20
CH
21 Outside Air
Temp
Outside Air
Temp
HP Return
Temp
HP Return
Temperature
Link
Brown
Blue
Green/Yellow
L
N
A1A22TR 1TR -
Link
Grant NeoStat
Programmable Room
Thermostat
2-Port Zone Valve
HTG
Motor
Blue
Green/Yellow
Brown
Orange
Grey
ASHP Side Terminal
N1 2 3
Do Not Use
L
E
From
lockable
isolator
L N E
230V
50HZ
5A
SUPP
DMD
HW
DMD
CH
DMD
L N
From
lockable
isolator

Section 4: ElectricalPage 14
Figure 4-4: EvoLink System Wiring Diagram - S-Plan type system - volt free switching - heating only boiler
4.14 SYSTEM WIRING DIAGRAMS - VOLT FREE SWITCHING - HEATING ONLY BOILER
Scale: NTS
Paper Size: A3
Project Title: EvoLink S-Plan Wiring Diagram
Volt-free switching Boiler operation
Drawing Set: EvoLink Wiring Diagrams
Status: Approved
Rev Date: 15/12/2023 Drawn By: AC Checked By: NS
Dwg. No. EVOWD02
Revision: 3.2
Grant UK Ltd.
Notes: Some Neutral and Earth connections
have been excluded for clarity.
Outdoor air
temp sensor
2
Digital
Dual Thermostat
L N C1
CH1CH2CH3
CH4N L
Grant HPIDTM4
DHW Timer
Grey
Black
Blue
Brown
L N E
230V
50HZ
5A
1 2 345 6 78 9 10
Wiring Centre
Frost
Stat
Pipe Stat
(If fitted)
Brown
Blue
Green/Yellow
11 12
2-Port Zone Valve
HW
Motor
Blue
Green/Yellow
Brown
L
N
A1A2RT1RT2 -
Link
Grant NeoStat
Programmable Room
Thermostat
2-Port Zone Valve
(Space Heating)
HTG
Motor
Blue
Green/Yellow
Brown
Orange
Grey Orange
Grey
Supplementary
Heating
Appliance
(Boiler)
L N E
Optional additional
circulating pump
L N E
Link Link Link
Volt Free
connection
for boiler
o o
kWh
+ -
1 2 3 4
Electricity
meter
17
18
19
20
21
22
23
24
25
1
2
3
4
5
6
7
8
Link
ASHP Terminals
Hot Water (Yellow)
Common (Red)
Heating (Blue)
ASHP Side Terminal
N1 2 3
Do Not Use
L
E
From
lockable
isolator
This drawing and its content is subject to copyright. Use other than for its original intended purpose must be arranged with an employee of
Blagrove Industrial Estate, Swindon, Wiltshire, SN8 5YG, tel; 01380 736920
N
GRANT
5v Rx Tx 0v
EvoLink PCB
L
N
LN
E
+-
NO1
NO2
C1
C2
SUPP
DMD
HW
DMD
CH
DMD
Link Link
SUPP
DMD
HW
DMD
CH
DMD
L E N N
Mains Voltage Terminal Block
SUPP Heat
Demand Volt Free
Low Voltage Terminal Block
DHW
HP DMD VOLT FREE
18
DHW
19
CH
20
CH
21 Outside Air
Temp
Outside Air
Temp
HP Return
Temp
HP Return
Temperature
SUPP Heat
Demand Volt Free
SUPP
DMD
HW
DMD
CH
DMD
L E N N
Mains in 230 V AC
Revision Details:
3.2 Approved15/12/23
L N
Hot Water
Priority Relay
From
lockable
isolator

Section 5: EvoLink Operation Page 15
5 EvoLink Operation
5.1 INTRODUCTION
System flow
System return
Boiler
EvoLink
ASHP
System Return temperature sensor
Clipped to system return pipe
EvoLink Flow
temperature sensor
Clipped to EvoLink
Flow pipe
Supplementary (Boiler)
Flow temperature sensor
Clipped to boiler
Flow pipe
Figure 5-1: EvoLink Hydraulic Schematic Diagram

5.2 OPERATION
The EvoLink controls the operation of both the heat pump and the
supplementary heat source (boiler).
Additionally, the EvoLink can be set to operate in either ‘Green’
or ‘Comfort’ mode when meeting either a heating or domestic hot
water demand.
• Comfort Mode
In this mode the priority is to ensure that the required comfort
level is maintained.
If the heat pump is not capable of satisfying the heating load
the boiler will be called in and the EvoLink will mix the boiler
ow with the heat pump ow to maintain the required ow
temperature.
• Green Mode
In this mode the priority is to ensure that the heat pump
supplies as much of the heat energy as possible.
If the heat pump is not capable of satisfying the heating load
the boiler will be called in and the EvoLink will mix the boiler
ow with the heat pump ow to maintain the required ow
temperature. However, if the return temperature starts to rise
to a point where the heat pump will switch o󰀨, the mixing is
reduced to ensure that the heat pump can remain operating
for as long as possible.
5.2.1 SPACE HEATING
• If there is a space heating demand to the EvoLink from
the heating system controls, i.e., the programmer heating
channel and room thermostats(s) are ‘calling’, the EvoLink
will operate to provide space heating.
• The heat pump operates to achieve the weather
compensated HEATING SETPOINT ow temperature (as set
on the EvoLink user interface).
• If the heat pump is unable to achieve a ow temperature
within the TEMP BELOW SP AUTO CH band after the
TIME BELOW SP AUTO CH time period has elapsed (both
values as set on the EvoLink user interface) the EvoLink will
automatically start the boiler to raise the ow temperature to
the required weather compensated value.
• When the boiler ow temperature on the boiler ow pipe (left
hand pipe, refer to Figures 2-1 and 5-1) is 3°C above the
ow temperature on the EvoLink system ow pipe the PWM
mixing pump will start – feeding the boiler ow into the mixing
tank to achieve the required weather compensated ow
temperature.
• As the ambient outside temperature falls, and the heat
demand on the system increases, the required higher
weather compensated ow temperature in the mixing tank
is achieved by using a greater amount of the boiler ow until
the weather compensated ow temperature is achieved.
• This may be at the maximum ow temperature from the
boiler.
• Once started, even when the required weather compensated
ow temperature has been achieved, the boiler will remain in
operation until either,
a) the end of that heating demand, i.e., until the room
thermostat or programmer switches o󰀨.
or
b) when the heating load diminishes and %PWM falls
to below the END SUPP CH PWM setting for longer
than the END SUPP CH TIME setting, when it will be
automatically switched o󰀨.
• When there is a heating demand and the outside air
temperature is below or falls to below the OUTSIDE TEMP
BOILER ONLY setting, the boiler will be automatically
started, along with the EvoLink circulating pump, and
become the ‘lead’ heat source. The heat pump will not
operate as it will be ine󰀩cient for it to do so at this low
outside air temperature.
• If the outside temperature rises to above the OUTSIDE
TEMP BOILER ONLY setting, the boiler, and the EvoLink
circulating pump, will be automatically switched o󰀨 and the
heat pump will start up as lead heat source.
Section 5: EvoLink OperationPage 16
5.2.2 HOT WATER
• If there is a hot water demand to the EvoLink, i.e., if both
the hot water channel of the programmer and the cylinder
thermostat are ‘calling’, the EvoLink will operate to provide
hot water.
• Note that if the EvoLink is operating to provide space
heating when the hot water demand occurs, the EvoLink will
immediately ignore the space heating demand and switch
over to meet the hot water demand.
• The heat pump operates to achieve the HOT WATER
SETPOINT ow temperature (as set on the EvoLink user
interface). Note that this is not weather compensated.
• If the heat pump is unable to achieve a ow temperature
within the TEMP BELOW SP AUTO DHW band after the
TIME BELOW SP AUTO DHW time period has elapsed (both
values as set on the EvoLink user interface), the EvoLink will
automatically start the boiler to raise the ow temperature to
the required HOT WATER SETPOINT level.
• When the boiler ow temperature on the boiler ow pipe (left
hand pipe, refer to Figures 2-1 and 5-1) is 3°C above the
ow temperature on the EvoLink system ow pipe, the PWM
mixing pump will start – feeding the boiler ow into the mixing
tank to achieve the required ow temperature.
• Once started, even when the required Hot Water Setpoint
ow temperature has been achieved, the boiler will remain in
operation until the end of that hot water demand, i.e., until the
cylinder thermostat or programmer switches o󰀨.
• When there is a hot water demand and the outside air
temperature is below, or falls to below, the OUTSIDE TEMP
BOILER ONLY setting, the boiler will be automatically started
along with the EvoLink circulating pump, and become the
‘lead’ heat source. The heat pump will not operate as it will
be ine󰀩cient for it to do so at this low outside air temperature.
• If the outside temperature rises to above the OUTSIDE
TEMP BOILER ONLY setting, the boiler, and the EvoLink
circulating pump, will be automatically switched o󰀨 and the
heat pump will start up as lead heat source.
5.2.3 LEGIONELLA DEMAND COUNT
• This function requires the EvoLink Legionella Interface to be
tted. Refer to Section 4.5.
• It is designed to automatically operate an electric immersion
heater to provide anti-legionella protection after a pre-set
number of hot water demands (up to a maximum of 20) have
occurred.
• However Grant UK recommend the use of a 7-day Immersion
programmer to provide anti-legionella protection. This will
control the timed operation of the cylinder immersion heater
for the required period on either a daily or weekly basis.
Refer to the Aerona³ installation instructions Section 5.3
for details on Legionella sanitation regimes and Section
4.5 of these instructions for details of the 7-day immersion
programmer.
5.2.4 SUPPLEMENTARY DHW TYPE
Although the EvoLink shows this function accessible tapping the
hot water icon, this function remains inoperative. The element is
not operable but the boiler is if required.
5.2.5 BOOST MODE
Although this function can be accessed by tapping the Hot Water
icon on the touchscreen user interface, it is currently inoperable
and not available for use.

Section 5: EvoLink Operation Page 17
5.3 MANUAL OVERRIDE OPERATION
• The Grant EvoLink control system includes a manual
override function, operated via the touch screen user
interface.
• By using this function the EvoLink control can be manually
overridden to force the boiler to operate.
• Operation of the override function to manually start the
boiler, automatically interrupts the demand to the heat pump,
causing it to stop.
• The circulating pump in the EvoLink will automatically start
with the boiler as replacement for the circulating pump in the
heat pump that has stopped.
• The PWM pump will also start to transfer the heated water
within the bu󰀨er/mixing tank from the boiler to the EvoLink
ow pipe.
• Setting the manual override function to OFF will stop the
boiler operation and re-instate the heat demand to the heat
pump allowing it to re-start.
• The circulating pump in the EvoLink will automatically stop
with the boiler.
• The PWM pump may continue to operate if the boiler is
required to assist the heat pump to meet the required
EvoLink ow temperature.
• Refer to Section 6.5 for details of how to use the touch
screen user interface to operate the manual override
function.
5.4 DIAGNOSTIC SCREEN
To access the ‘DIAGNOSTIC SCREEN’, follow the instructions
given in Section 6.3.
This provides TWO useful functions for the installer or service
engineer:
• A display of live data to indicate the current operating status
of the EvoLink.
• The capability to manually operate various functions of the
EvoLink, e.g. the pumps.
The following items on the ‘DIAGNOSTIC SCREEN’ indicate
the current operating status of the EvoLink system:
FLOW TEMP °C
The ow temperature from the EvoLink to the heating system.
SUPP TEMP °C
The ow temperature from the supplementary heating (e.g.
boiler), as measured by the bu󰀨er temperature sensor T2.
RTRN TEMP °C
The return temperature to the EvoLink from the heating system.
OS TEMP °C
Outside ambient air temperature as measured by the outside air
temperature sensor.
WATT MTR Wh
The electrical consumption of the heat pump as measured by the
electricity meter connected to the EvoLink.
CH DEMAND
That there is a CH demand from the space heating controls
connected to the EvoLink. O=O󰀨 and I=On.
DHW DEMAND
That there is a DHW demand from the hot water controls
connected to the EvoLink. O=O󰀨 and I=On.
SUPP DEMAND
That there is a demand for the supplementary heater (e.g. boiler)
from the heat pump. O=O󰀨 and I=On.
The following items on the ‘DIAGNOSTIC SCREEN’ allow the
installer or service engineer to manually override the EvoLink
controls:
IMPORTANT. To use the following the EvoLink MUST be rst
be set to standby.
MIX PUMP
Tap the square icon once to operate the PWM mixing pump to
check pump operation. I=On.
Tap the icon a second time to switch the PWM mixing pump o󰀨.
O=O󰀨
CIR PUMP
Tap the square icon once to operate the Circulating pump to
check pump operation. I=On.
Tap the icon a second time to switch the Circulating pump o󰀨.
O=O󰀨.
SUPP PUMP
Tap the square icon once to operate the Supplementary pump (if
tted) to check pump operation. I=On
Tap the icon a second time to switch the Supplementary pump o󰀨.
O=O󰀨.
HEAT PMP CH
Tap the square icon once to operate the heat pump in the CH
mode. I=On.
Tap the icon a second time to switch the heat pump o󰀨. O=O󰀨.
HEAT PMP HW
Tap the square icon once to operate the heat pump in the DHW
mode. I=On.
Tap the icon a second time to switch the heat pump o󰀨. O=O󰀨.
LEGION OUT
Tap the square icon once to operate the Legionella interface (if
tted). I=On.
Tap the icon a second time to switch the Legionella interface o󰀨.
O=O󰀨.
BOILER VFC
Tap the square icon once to operate the boiler ‘volt free’ contact to
start the boiler. I=On.
Tap the icon a second time to switch the boiler o󰀨. O=O󰀨.
PWM SETTING
With the MIX PUMP set to on (I=On), tap the + or – icons to adjust
the PWM setting for the PWM mixing pump. This can be adjusted
in increments of 10%.
PWM VALUE %
The %PWM value set as above is displayed.
! NOTE !
Any of the above manual settings of the pumps, heat
pump, boiler, etc. will be automatically cancelled when the
EvoLink is switched back to on.

Section 5: EvoLink OperationPage 18
Table 5-1: EvoLink parameters
Ref. Parameter name Range Description Default
1HP MAX TEMP CH 30 to 70°C The maximum heat pump ow temperature in the heating mode as
set on the Aerona³ heat pump (parameter 21 02). 55°C
2 HP MAX TEMP DHW 30 to 70°C The maximum heat pump ow temperature in the hot water (DHW)
mode as set on the Aerona³ heat pump (parameter 31 11). 55°C
3TEMP BELOW SP AUTO CH 1 to 100°C The temperature below the current setpoint in a CH demand where
the EvoLink will be timing whether to call in supplementary heat. 3°C
4TIME BELOW SP AUTO CH 1 to 200 mins
The time which the temperature must be below the setpoint in
a CH demand minus ‘TEMP BELOW SP AUTO CH’ to call in
supplementary heat. It is a pseudo integral timer.
45 mins
5END SUPP CH PWM 1 to 50% PWM
When supplementary heat is active during a CH demand, this is the
PWM pump percentage which will cause the EvoLink to time when
to drop out of supplementary heat.
20%
6END SUPP CH TIME 1 to 60 mins The time which the PWM must be below ‘END SUPP CH PWM’ to
end the call for supplementary heat. It is a pseudo integral timer. 10 mins
7 RET TEMP DELTA END HP 0 to 10°C
If the return temperature reaches ‘HP MAX TEMP CH’ minus this
parameter in ‘COMFORT’ mode, the heat pump demand will end and
will be satised using the supplementary heat until the next demand
2°C
8 RET TEMP DELTA PWM 0 to 10°C
If the return temperature reaches ‘HP MAX TEMP CH’ minus this
parameter in ‘GREEN’ mode, the PWM will be set to zero so that the
heat pump will provide the energy to the load ensuring that the heat
pump will stay on.
4°C
9 TEMP BELOW SP AUTO DHW 1 to 100°C
The temperature below the current setpoint in a DHW demand
where the EvoLink will be timing whether to call in supplementary
heat.
3°C
10 TIME BELOW SP AUTO DHW 1 to 60 mins
The time which the temperature must be below the setpoint in
a DHW demand minus ‘TEMP BELOW SP AUTO CH’ to call in
supplementary heat. It is a pseudo integral timer.
10 mins
11 OVERRIDE MODE
OFF This allows manual selection of the supplementary heat source.
The EvoLink will use the heat pump as its primary heat source. O󰀨
ON The EvoLink will use the supplementary heat source as its primary
heat source.
12 LEGIONELLA DEMAND COUNT 0 to 20
The number of DHW demands before the EvoLink will call in the
immersion heater to bring the hot water cylinder up to the setpoint on
the immersion thermostat.
0 = disabled
0
13 OUTSIDE TEMP BOILER ONLY -30 to 10°C The outside temperature below which the EvoLink will use the
supplementary as the primary heat source. -5°C
14 GREEN/COMFORT MODE
Green
The heat pump is run as much as possible by zeroing the PWM
when the return temperature reaches the ‘HP MAX TEMP CH’ minus
‘RET TEMP DELTA PWM’
Comfort
Comfort
The heat pump will be stopped if the return temperature reaches
‘HP MAX TEMP CH’ minus ‘RET TEMP DELTA END HP’ - leaving
supplementary heat (boiler) only until next heating demand. This will
ensure that the heat pump does not continue to run its circulating
pump without producing heat.
15 W/C TEMP OUTSIDE LOW -10 to 12°C The ow temperature which relates to ‘OUTSIDE TEMPERATURE
LOW’ -3°C
16 W/C TEMP OUTSIDE HIGH 15 to 25°C The ow temperature which relates to ‘OUTSIDE TEMPERATURE
HIGH’ 18°C
17 W/C TEMP FLOW LOW 10 to 30°C The outside air temperature which relates to ‘FLOW
TEMPERATURE LOW’ 30°C
18 W/C TEMP FLOW HIGH 30 to 80°C The outside air temperature which relates to ‘FLOW
TEMPERATURE HIGH’ 70°C
19 ON/OFF box
OFF (shown) The weather compensation curve is not active, the heating setpoint
is xed. O󰀨
ON (shown) The weather compensation curve is active, the heating setpoint will
follow the curve.
20 HEATING SETPOINT 30 to 80°C The xed heating setpoint when the weather compensation is not
active. 45°C
21 HOT WATER SETPOINT 40 to 65°C The setpoint when there is a DHW demand. 50°C
22 BOOST MODE 0-90 (in 30
minutes steps) Inoperative 0
23/24 SUPPLEMENT DHW TYPE Boiler Inoperative Boiler
Element
5.5 EVOLINK PARAMETERS

6 Commissioning
6.1 GENERAL
Before starting to commission the Grant EvoLink, the installation,
including the Aerona³ air source heat pump, must be completed
as detailed in Section 3.9 of these instructions.
! NOTE !
In order to commission the EvoLink installation, the
following information must be used in conjunction with
the Aerona³ installation instructions supplied with the heat
pump.
6.2 AERONA³ AIR SOURCE HEAT PUMP
Switch on the power to the heat pump via the external isolator.
Press and hold the ON/OFF icon on the heat pump remote
controller for three seconds to turn the heat pump on – refer to
Aerona³ installation instructions Section 9.1.
Set the day and time on the heat pump remote controller – refer to
Aerona³ installation instructions Section 9.2.
Access the heat pump parameter settings menu via the heat
pump remote controller – refer to Aerona³ installation instructions
Section 9.3.
Check Aerona³ heat pump settings for weather compensation are
as given in Table 6-2 of these instructions.
6.3 EVOLINK USER INTERFACE
The user interface provides the following features for the User and
Installer:
a) Home screen with animated icons indicating:
• Heating demand
• Hot water demand
• Heat pump operation
• Boiler operation
b) Access to check, adjust and set the operating parameters for
the EvoLink system. Refer to section 5.5, 6.4 and Figures 6-1
& 6-2.
c) Option to manually override the EvoLink control and force the
supplementary heat source (e.g. boiler) to operate. Refer to
Section 6.5.
d) Operating data giving:
• The electricity consumed by the heat pump kWh (Note.
This requires an electricity meter to be connected to the
EvoLink – refer to Section 4 for the electrical connection
details).
• Percentage of time the heat pump has been operating
for (% hours).
• Percentage of time the supplementary heat source (e.g.
boiler) has operated for (% hours).
e) Diagnostics screen – refer to Section 6.6 for further details:
• Flow temperature °C
• Supp temperature °C (e.g. boiler ow temperature)
• Return temperature °C
• Outside temperature °C
• WATT MTR
• CH demand
• DHW demand
• Supp demand
• Mix pump operation
• Circulation pump operation
• Supp pump operation
• Heat pump CH operation
• Legionella output
• Boiler VFC
• PWM Setting
• Pump PWM value %
Section 6: Commissioning Page 19
Heating demand
Hot water demand
Heat pump operation
Boiler operation
Settings
Figure 6-1: User interface home screen
! NOTE !
For the user interface touch screen to be visible, the power
supply to the EvoLink must be switched on.
To access the ‘Operating Data’ screen
Tap the gear wheel (Settings) icon on the home screen. Refer to
Figure 6-1.
The ‘SETTINGS’ screen will appear.
Tap the ‘OPERATING DATA’ option.
The operating data screen will appear.
Tap the ‘Return’ icon to return to the settings screen.

Section 6: CommissioningPage 20
To access the ‘Diagnostic’ screen
Tap the gear wheel (Settings) icon on the home screen. Refer to
Figure 6-1.
The ‘SETTINGS’ screen will appear.
Tap the ‘PASSWORD’ option.
The password screen will appear.
Enter the password (9876) and tap the tick icon.
The ‘SETTINGS’ screen will appear with the live data options.
Use either the ▲ or ▼ icons to scroll through and tap the
‘DIAGNOSTIC SCREEN’ option.
Use either the ▲ or ▼ icons to scroll through and view the
diagnostic screen options.
Refer to Section 5.4 - Diagnostic Screen for details of the
diagnostic functions available.
Tap the ‘Return’ icon to return to the home screen.
6.4 PARAMETER SETTINGS
The EvoLink operating parameters are accessed and set using
the touch screen user interface. Refer to Figure 6-1.
6.4.1 TO SET THE HEATING AND HOT WATER
SETPOINTS
For heating:
Tap the radiator (heating) icon on the home screen.
The ‘HEATING SETPOINT’ screen will appear.
Tap the + or – icons to adjust the setpoint as required.
Tap the tick icon to conrm the setting and tap return icon to
return to the home screen.
For hot water:
Tap the tap icon (hot water) on the home screen.
The ‘HOT WATER SETPOINT’ screen will appear.
Tap the + or – icons to adjust the setpoint as required.
Tap the tick icon to conrm the setting and tap return icon to
return to the home screen.
6.4.2 TO SET THE WEATHER COMPENSATION
PARAMETERS
Tap the gear wheel (Settings) icon on the home screen.
The ‘SETTINGS’ screen will appear.
Tap the ‘PASSWORD’ option.
The password screen will appear.
Enter the password (9876).
To conrm the password tap the tick icon.
The ‘SETTINGS’ screen will appear.
Tap the ‘WEATHER COMP’ option.
The weather compensation screen will appear (graph).
Set the weather compensation parameters as follows:
Temperature Flow High
Tap the Temperature Flow High setting on the weather
compensation screen (upper left value on the graph).
The W/C TEMP FLOW HIGH screen will appear.
Tap the + or – icons to adjust the setpoint as required.
Tap the tick icon to conrm the setting.
The display will return to the weather compensation screen.
Temperature Flow Low
Tap the Temperature Flow Low setting on the weather
compensation screen (lower left-hand value on the graph).
The W/C TEMP FLOW LOW screen will appear.
Tap the + or – icons to adjust the setpoint as required.
Tap the tick icon to conrm the setting.
The display will return to the weather compensation screen.
Temperature Outside Low
Tap the Temperature Outside Low setting on the weather
compensation screen (bottom left value on the graph).
The W/C TEMP OUTSIDE LOW screen will appear.
Tap the + or – icons to adjust the setpoint as required.
Tap the tick icon to conrm the setting.
The display will return to the weather compensation screen.
Temperature Outside High
Tap the Temperature Outside High setting on the weather
compensation screen (bottom right value).
The W/C TEMP OUTSIDE HIGH screen will appear.
Tap the + or – icons to adjust the setpoint as required.
Tap the tick icon to conrm the setting.
The display will return to the weather compensation screen.
When all four weather compensation parameters are correct:
Tap the ON/OFF icon so 'ON' is displayed.
! NOTE !
The EvoLink is supplied with the weather compensation
defaulted to OFF, i.e. OFF shown on the display. In this
setting the weather compensation is NOT operational.
Tap the ‘Return’ icon to return to the ‘SETTINGS’ screen.
6.4.3 PARAMETERS
Tap 'PARAMETERS' and the HP MAX TEMP CH screen will be
displayed.
Set the HP MAX TEMP CH
This should be set to the same value as the heat pump heating
ow temperature setting.
Tap the + or – icons to adjust the HP MAX TEMP CH value as
required.
Tap the tick icon to conrm the setting.
Tap the ► icon to go to the HP MAX TEMP DHW screen.
Set the HP MAX TEMP DHW
This should be set to the same value as the heat pump hot water
ow temperature setting.
Tap the + or – icons to adjust the HP MAX TEMP DHW value as
required.
Tap the tick icon to conrm the setting.
Tap the ► icon to go to the TEMP BELOW SP AUTO screen.
Set the TEMP BELOW SP AUTO CH
Tap the + or – icons to adjust the TEMP BELOW SP AUTO CH
value as required.
Tap the tick icon to conrm the setting.
Tap the ► icon to go to the TIME BELOW SP AUTO CH screen