Grant Aerona 3 HPID6R32 User manual

UK | DOC 0136 | Rev 2.2 | November 2022
Grant Aerona³
Air to Water High E󰀩ciency Heat Pump Range
Installation and Servicing Instructions

GRANT ENGINEERING (UK) LIMITED
Frankland Road, Blagrove Industrial Estate, Swindon, SN5 8YU
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This manual is accurate at the date of printing but will be superseded and should be disregarded if specications and/or appearances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.
IMPORTANT NOTE FOR INSTALLERS
These instructions are intended to guide installers on the
installation, commissioning and servicing of the Grant Aerona³
heat pump. After installing the heat pump, leave these instructions
with the user.
A user handbook is available to guide users in the operation of the
heat pump.
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.
SERVICING
The heat pump should be serviced at least every twelve months
and the details entered in the service Log in the user handbook.
PRODUCT CODES COVERED
These instructions cover the following product codes:
Product code
HPID6R32 - 6kW
HPID10R32 - 10kW
HPID13R32 - 13kW
HPID17R32 - 17kW
Output at 7°C air and 35°C ow temperature
Power Quality Information
HPID6R32 Complies with the Technical requirements of BS EN/IEC 61000-3-2
Complies with the Technical requirements of BS EN/IEC 61000-3-3
HPID10R32 Complies with BS EN/IEC 61000-3-11 & BS EN/IEC 61000-3-12
Complies with the technical requirements of BS EN/IEC 61000-3-2
Complies with the technical requirements of BS EN/IEC 61000-3-3
HPID13R32 Complies with BS EN/IEC 61000-3-11 & BS EN/IEC 61000-3-12
HPID17R32 Complies with BS EN/IEC 61000-3-11 & BS EN/IEC 61000-3-12
IMPORTANT NOTE FOR
INSTALLERS
The data label gives you very
important information about the
installed heat pump. Do not
remove this label from the heat
pump under any circumstances.
The year of manufacture is
contained within the serial number
(SN).
The last two digits of the middle
set of four numbers (eg. 8820)
indicates the year of manufacture.
In this example, the year is 2020.

Contents Page 3
CONTENTS
1 INTRODUCTION 6
1.1 General 6
1.2 Main Components 6
1.3 Planning Permission 6
1.4 DNO Application 6
1.5 Important Advice 7
1.6 Product Contents 7
1.7 Installation Accessories 7
1.8 Control Parameters 7
1.9 Heat Pump Components 8
2 TECHNICAL DATA 9
2.1 Heat Pump Technical Data 9
2.2 Mains Supply Cable 10
2.3 Base Tray Heater 10
2.4 Heat Pump Dimensions 10
2.5 Remote Controller Dimensions 11
3 INSTALLATION INFORMATION 12
3.1 Introduction 12
3.2 Heating System Design Criteria 12
3.3 Regulations 12
3.4 Heat Pump Location 13
3.5 Preparation for Installation 13
3.6 Wall Mounted Installations 14
3.7 Installing the Heat Pump 14
3.8 Metering requirements 15
3.9 Volumiser Tanks 15
3.10 Coastal Installations 15
3.10 Hydraulic Diagrams 15
3.11 Before you Commission 16
3.12 Completion 17
3.13 Installation Checklist 17
4 SEALED SYSTEMS 18
4.1 Sealed System Requirements 18
4.2 Filling the Sealed System 19
4.3 Pressure Relief (Safety) Valve Operation 19
5 DOMESTIC HOT WATER 20
5.1 Temperature Control 20
5.2 Quick Recovery Cylinders 20
5.3 Legionella 21
5.4 Grant 7-Day Immersion Programmer 21
6 ELECTRICAL 23
6.1 Wiring Centre 23
6.2 Terminal PCB Input/Output 24
6.3 Power Supply 24
6.4 Tightening Torques 26
6.5 Solar Thermal 26
6.6 Connection of Heating System Controls 26
6.7 Connection of Remote Controller 26
6.8 Grant Interface Relay Box 26
6.9 Grant EP001 Wiring Centre 26
6.10 Hot Water Priority Relay 26
6.11 Wiring Diagrams 26
6.12 System Control Wiring Diagram 27
7 REMOTE CONTROLLER 28
7.1 Remote Controller 28
7.2 Installation Requirements 28
7.3 Installing the Remote Controller 28
7.4 Connecting the Remote Controller 29
to the Heat Pump
7.5 Buttons 30
7.6 Display Panel 31
8 OPERATION 32
8.1 Heat Pump Operation 32
8.2 Weather Compensation 34
8.3 Water Pump Management 35
8.4 Frost Protection 38
8.5 ON/OFF DHW Production Remote Contact 40
8.6 ON/OFF Heating Remote Contact 41
8.7 Night Mode 42
8.8 Low Tari󰀨 43
9 COMMISSIONING 44
9.1 System Setup 44
9.2 Setting the Day and Time 44
9.3 Access for Parameter Settings 45
9.4 Accessing the Parameter Setting Menu 45
(User level)
9.5 Accessing the Parameter Setting Menu 45
(Installer level)
9.6 Temperature Control - DHW function 45
9.7 Parameters Input/Output 46
9.8 Remote Controller Back Light Display 46
Parameters
9.9 Weather Compensation 47
9.10 Frost Protection Function Setting 47
9.11 Pump Operation and Air Bleeding 47
from Heating System
9.12 Pump Output Setting 47
9.13 Flow Regulator 47
9.14 Balancing the Primary Circuit 48
10 SERVICING 49
10.1 General 49
10.2 Air Inlet and Outlet 49
10.3 Condensate Disposal 49
10.4 Heating System Connections 49
10.5 Heat Pump Controls 49
10.6 Refrigerant 49
10.7 Monitor Display Function 50
11 FAULT FINDING 51
11.1 Error Code Display 51
11.2 Error History Display 51
11.3 Reset Error Code Display 51
11.4 Error Codes 52
11.5 Table of Controller PCB and Terminal 55
PCB Alarms
11.6 Error Codes and PCB Alarm Figures 56
and Tables
12 SPARE PARTS 59
12.1 Exploded Diagram - HPID6R32 59
12.2 Spare Parts List - HPID6R32 60
12.3 Exploded Diagram - HPID10R32 61
12.4 Spare Parts List - HPID10R32 62
12.5 Exploded Diagram - HPID13R32 63
12.6 Spare Parts List - HPID13R32 64
12.7 Exploded Diagram - HPID17R32 65
12.8 Spare Parts List - HPID17R32 66
13 DECLARATIONS OF CONFORMITY 67
13.1 EC Declaration of Conformity - HPID6R32 67
13.2 EC Declaration of Conformity - HPID10R32 68
13.3 EC Declaration of Conformity - HPID13R32 69
13.4 EC Declaration of Conformity - HPID17R32 70
14 HEALTH AND SAFETY 71
INFORMATION
14.1 General 71
14.2 Refrigerant (R32) 71

Page 4 Contents
CONTENTS
15 DISPOSAL AND RECYCLING 71
16 PRODUCT FICHE 72
16.1 Product Fiche - HPID6R32 72
16.2 Product Fiche - HPID10R32 74
16.3 Product Fiche - HPID13R32 76
16.4 Product Fiche - HPID17R32 78
17 GUARANTEE 80
APPENDIX A - 82
INSTALLATION PACK A
CONTROL SYSTEM SCHEMATICS
APPENDIX B - 84
INSTALLATION PACK B
CONTROL SYSTEM SCHEMATICS
APPENDIX C - 86
INSTALLATION PACK C
CONTROL SYSTEM SCHEMATICS
APPENDIX D - PARAMETERS LIST 89
APPENDIX E - WIRING DIAGRAMS 92
APPENDIX F - 95
COMMISSIONING -
PARAMETERS RECORD
NOTES 97

Page 5
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Section 1: IntroductionPage 6
1.1 GENERAL
The Grant Aerona³ range consists of four compact, lightweight,
MCS approved, monobloc, air-to-water, inverter driven, single-
phase air source heat pumps working with R32 refrigerant.
It is important that these installation and servicing instructions are
followed to ensure correct installation and operation. Failure to do
so may result in poor performance.
These instructions do not replace the installation or users manuals
for any additional components used in the design of your system
e.g. cylinders, motorised valves, programmers, solar thermal
devices, bu󰀨ers, etc.
These instructions must be left with the product for future
reference.
1.2 MAIN COMPONENTS
Each model incorporates the following main components:
• DC inverter - this responds rapidly to changing conditions
to provide the necessary output to meet heating demands
by varying the speed and output of the compressor, fan
and circulating pump. This reduces the on/o󰀨 times of the
compressor, keeping the water temperature constant during
operation reducing the electricity consumption.
• Compressor - a high-e󰀩ciency DC twin-rotary compressor to
provide smooth performance and quiet operation.
• Plate heat exchanger (condenser) - the high-e󰀩ciency plate
heat exchanger is used to transfer heat to the heating system
primary circuit.
• Fan - a high-e󰀩ciency DC fan motor is used for smooth and
quiet operation. A single fan is tted to the HPID6R32 (5 blade)
and HPID10R32 (3 blade) units. Two fans (3 blade) are tted to
the HPID13R32 and HPID17R32 units.
• Circulating pump - high-e󰀩ciency DC pump speed controlled
from the ASHP control PCB.
• Base tray heater - factory tted electric heater prevents
condensate in the base of the heat pump from freezing. When
the ambient temperature reaches 2.5°C, the base tray heater
turns on and at 5.5°C turns o󰀨 (ΔT of 3k). This cannot be
adjusted or turned o󰀨. Refer to Section 2.3.
• Pressure relief valve - a 3 bar pressure relief valve is factory
tted.
• Air purge valve (automatic air vent) - factory tted to assist
in the removal of air from the heating primary circuit of the heat
pump.
1.3 PLANNING PERMISSION
The installation of a Grant Aerona³ heat pump on domestic
premises may be considered to be permitted development, not
needing an application for planning permission, provided ALL the
limits and conditions listed on the Planning Portal website are met.
For further information, visit www.planningportal.gov.uk.
1 Introduction
1.4 DNO APPLICATION
Under all circumstances there is a requirement to inform the
Distribution Network Operator (DNO) of the installation of a
heat pump. This will be in the form of either an application or a
notication to the DNO.
Notication is the process whereby if the proposed addition/
alteration is assessed by the installer to be within the existing rating
of the supply equipment and the maximum demand (MD) is ≤32A,
the heat pump can be installed and the DNO notied retrospectively
(i.e. within 28 days). This option is only possible for the Grant
Aerona³ HPID6R32 and HPID10R32 models; and is only available
if certain criteria are met. Please review the process detailed in the
web link below.
For all other units an application must be made to the DNO before
connecting the heat pump(s) to the mains electrical supply.
The time to get permission from the local DNO will vary and can
take up to four weeks, so it is essential to submit the application at
the earliest possible date. Please note that the cost of any required
changes to the electrical supply network may be rechargeable to
the homeowner in question.
Further details on application/notication process can be found at
https://www.energynetworks.org/operating-the-networks/connecting-
to-the-networks/connecting-electric-vehicles-and-heat-pumps
The same forms are used for either notication or application and
for the Grant Aerona³ ASHP can be downloaded from the Grant
UK website (www.grantuk.com). These must be completed by the
installer or electrician and then submitted to the correct DNO for the
area in question.
There are six DNOs operating the electrical distribution network
throughout England, Scotland and Wales and the application must
be made to the DNO covering the area in which the installation is
situated.
To Identify the DNO concerned visit the Energy Networks
Association (ENA) website at www.energynetworks.org/info/
faqs/who-is-my-network-operator.html or use the Meter Point
Administration Number (MPAN) on the electricity meter tted in the
property.

Section 1: Introduction Page 7
1.5 IMPORTANT ADVICE
1. It is essential that the full layout of the system is understood
before the installation of any component is undertaken. If you
are in any doubt, please stop and seek advice from a qualied
heating engineer or from Grant UK. Please note that Grant
UK will not be able to o󰀨er specic advice about your system
unless we designed it. In this case, we will always refer you to
seek the advice of a qualied system designer.
2. The heat pump must be installed and commissioned in
accordance with these installation and servicing instructions.
Deviations of any kind will invalidate the guarantee and
may cause an unsafe situation to occur. Please seek advice
from Grant UK if any of these user, installation and servicing
instructions cannot be followed for whatever reason.
3. The heat pump contains high pressures and high temperatures
during normal working conditions. Care must be taken when
accessing the internal workings of the heat pump.
4. The heat pump contains an electrically driven fan which rotates
at high speed. Disconnect the heat pump from the electrical
supply before removing the top cover.
1.6 PRODUCT CONTENTS
The Aerona³ comes supplied on a single pallet. The following items
are included:
Table 1-1: Product Contents
HPID6R32 HPID10R32 HPID13R32 HPID17R32
Aerona³ heat pump 6kW 1
Aerona³ heat pump 10kW 1
Aerona³ heat pump 13kW 1
Aerona³ heat pump 17kW 1
Condensate drain elbow 1 1 1 1
Anti-vibration shoes 4
¾ʺ BSP x 22 mm exible
hose c/w washer 2
1ʺ BSP x 28 mm exible
hose c/w washer 222
1ʺ nipple 2 2
1ʺ x 1¼ʺ reducing socket 2 2
22 mm isolating valve 2
28 mm isolating valve 222
Remote controller 1 1 1 1
Remote controller cable
(length: 8 metres) 1 1 1 1
DN20 - 42 Flow regulator 1 1 1
DN20 - 70 Flow regulator 1
Installation and servicing
instructions 1 1 1 1
User instructions 1 1 1 1
1.7 INSTALLATION ACCESSORIES
The following are available from Grant UK:
Table 1-2: Installation accessories
Product code Description
HPIDFOOT/KIT2 Anti-vibration mounts (2 x 600mm and xing kit)
HPIDINSU/KIT Through wall insulation kit (22 - 28mm exible hoses)
HPIDSYSLLHKIT Grant System Combined Volumiser/Low Loss Header
HPIDVOL30EXT 30 litre External Volumiser with 3kW backup
Immersion Heater
HPIDR32PACK1 Grant Aerona³ Installation Pack A
HPIDR32PACK2 Grant Aerona³ Installation Pack B
HPIDR32PACK3 Grant Aerona³ Installation Pack C
1.8 CONTROL PARAMETERS
All parameters are listed sequentially in Appendix D.

Page 8 Section 1: Introduction
1.9 HEAT PUMP COMPONENTS
Figure 1-1: Main components - all models
PCB (Main)
PCB (Terminal)
Terminal block
Airpurge valve
Pump
Compressor
Pressure relief valve
High pressure switch
Air inlet is located in the left or in the back
Air inlet is located in the left or in the back
Air inlet is located in the left or in the back
Air outlet
Air outlet
Air outlet
Wiring lid
Screw
HPID6R32
HPID10R32
HPID13R32 & HPID17R32 HPID13R32 HPID17R32
PCB(Terminal)
Airpurge valve
Terminal block
Pump
Compressor
Pressure relief valve
High pressure switch
PCB(Main)
Wiring lid
Screw
PCB(Terminal)
Airpurge valve
Terminal block
Pump
Compressor
Pressure relief valve
High pressure switch
PCB(Main)
Wiring lid
Screw

Section 2: Technical Data Page 9
2.1 HEAT PUMP TECHNICAL DATA
Table 2-1: Technical data
Unit Model
HPID6R32 HPID10R32 HPID13R32 HPID17R32
Heating capacity (BS EN 14511 - air: 7°C / water: 35°C) kW 6.92 11.1 13.6 18.0
COP (BS EN 14511 - air: 7°C / water: 35°C) 4.91 5.28 5.25 4.79
SCOP (average climate conditions) - 35°C 4.61 5.20 5.40 4.54
Heating capacity (BS EN 14511 - air: 7°C / water: 55°C) kW 6.24 10.5 11.4 15.3
COP (BS EN 14511 - air: 7°C / water: 55°C) 3.04 3.12 3.23 3.15
SCOP - average climate conditions (BS EN 14825 - water: 55°C) 3.29 3.47 3.72 3.57
Power supply ~230V 1ph 50Hz
E󰀨ective power input (BS EN 14511 - air: 7°C / water: 35°C) kW 1.41 2.10 2.59 3.77
E󰀨ective power input (BS EN 14511 - air: 7°C / water: 55°C) kW 2.05 3.36 3.53 4.87
Mechanical protection IPX4
Compressor DC twin rotary - inverter driven
Pressure (maximum) MPa 4.2
Refrigerant R32
Mass of R32 kg 0.80 1.55 2.20 2.80
Circulating pump m head 10 6 12 12
Rated air ow (BS EN 14511 - air: 7°C / water: 35°) m³/h 2,082 2,664 4,464 4,464
Rated air ow (BS EN 14511 - air: 7°C / water: 55°) m³/h 2,082 2,664 4,664 4,464
Power input of fan (BS EN 14511 - air: 7°C / water: 35°) kW - - - -
Power input of fan (BS EN 14511 - air: 7°C / water: 55°) kW - - - -
Power input of circulating pump (BS EN 14511 - air: 7°C / water: 35°) kW - - - -
Power input of circulating pump (BS EN 14511 - air: 7°C / water: 55°) kW - - - -
Flow rate (minimum) litres/min 5 10 15 15
Rated ow rate (BS EN 14511 - air: 7°C / water: 35°) litres/min 20.22 32.16 40.68 50.88
Rated ow rate (BS EN 14511 - air: 7°C / water: 55°) litres/min 11.34 19.26 20.76 27.90
Outdoor temperature °C -20 to 43
Maximum inlet water temperature (not operating) °C 70
Water pressure (system) MPa (bar) 0.1 to 0.3 (1 to 3 bar)
Sound power level at 1 metre (external) dB(A) 65.2 64 60.8 61.6
Sound pressure level at 1 metre (external) (Q=1) dB(A) 54.2 53 49.8 50.6
Water connections BSPF ¾˝ 1˝ 1¼˝ 1¼˝
Weight (empty) kg 51 70 99 118
Weight (full) kg 52.8 71.8 101 120
Water content litres 1.8 1.8 2.0 2.0
Heat pump casing volume m³ 0.167 0.247 0.468 0.468
ErP rating (low temperature: 35°C ow) - heating A++ (A+++ from September 2019)
ErP rating (low temperature: 55°C ow) - heating A++ (HPID13R32 will be A+++ from September 2019)
2 Technical Data

Section 2: Technical DataPage 10
2.4 HEAT PUMP DIMENSIONS
Figure 2-1: HPID6R32 heat pump dimensions
2.2 MAINS SUPPLY CABLE
Always assume maximum possible load when considering
cable sizing.
The cable supplying power from the consumer unit to the heat
pump must be connected via an external 2 pole isolator. This allows
the service engineer to isolate the power supply before working on
the heat pump safely.
Refer to Section 6 for connection details.
Table 2-2: Electrical installation requirements
Heat pump
model
Maximum
running current
(A)
MCB
Rating (A) Type
HPID6R32 11.2 16 C
HPID10R32 17.5 20 C
HPID13R32 23.0 32 C
HPID17R32 25.3 32 C
2.3 BASE TRAY HEATER
The factory tted electric heater prevents condensate in the base
of the heat pump from freezing. When the ambient temperature
reaches 2.5°C, the base tray heater turns on and at 5.5°C turns o󰀨
(ΔT of 3k). This cannot be adjusted or turned o󰀨.
Base tray heater specication
V 230V
P 185W
t110°C
A 0.8A
Resistive load
R290 Ω
327
57
388 54
R3/4(20A)
30037.4 42
825 73
675
580 122.5 122.5
43
Circulating water
return port
Circulating water
outgoing port
HPID6R32
882
850 24
R1(25A)
R1(25A)
37 330 38
480173
155540155
75 70
357
Circulating water
return port
Circulating water
outgoing port
HPID10R32
680185
357
80 80
241000 3637 330
1418
205590205
Circulating water
outgoing port
Circulating water
return port
R1 1/4(32A)
R1 1/4(32A)
HPID13R32 and HPID17R32
327
57
388 54
R3/4(20A)
30037.4 42
825 73
675
580 122.5 122.5
43
Circulating water
return port
Circulating water
outgoing port
HPID6R32
882
850 24
R1(25A)
R1(25A)
37 330 38
480173
155540155
75 70
357
Circulating water
return port
Circulating water
outgoing port
HPID10R32
680185
357
80 80
241000 3637 330
1418
205590205
Circulating water
outgoing port
Circulating water
return port
R1 1/4(32A)
R1 1/4(32A)
HPID13R32 and HPID17R32
Figure 2-2: HPID10R32 heat pump dimensions

Page 11
2.5 REMOTE CONTROLLER DIMENSIONS
12
37 37
23 23
18.25
120 16.5
6-4.2×7
120
83.5 18.25
(116)
Knock out hole
Mounting plate Door closed Door open
Figure 2-4: Remote controller dimensions
327
57
388 54
R3/4(20A)
30037.4 42
825 73
675
580 122.5 122.5
43
Circulating water
return port
Circulating water
outgoing port
HPID6R32
882
850 24
R1(25A)
R1(25A)
37 330 38
480173
155540155
75 70
357
Circulating water
return port
Circulating water
outgoing port
HPID10R32
680185
357
80 80
241000 3637 330
1418
205590205
Circulating water
outgoing port
Circulating water
return port
R1 1/4(32A)
R1 1/4(32A)
HPID13R32 and HPID17R32
Figure 2-3: HPID13R32 & HPID17R32 heat pump dimensions
Section 2: Technical Data

Section 3: Installation InformationPage 12
• If yes, what is the capacity of the bu󰀨er?
• Has cavity wall insulation been installed?
• Has loft insulation of 270mm been installed?
• Have all system pipes been lagged correctly?
• Are the existing controls being upgraded?
3.2.1 SYSTEM DESIGN CRITERIA
A typical condensing oil or gas red boiler operates with a ow of
70°C and a return of 50°C, i.e. with a DT of 20°C. A heat pump
operates with a ow of between 30°C and 55°C with a DT of 8°C.
The design of any system in the UK is typically based on the
following parameters:
1. That the outside design air temperature can fall to -3°C or
lower
2. The internal design temperature can be between 18-22°C
depending on the room concerned.
3. The heat pump operates at lower water temperatures than an
oil or gas red appliance.
Designing a new system for use with a heat pump is straight
forward, assuming the insulation properties of the dwelling
meets or exceeds current Building Regulations and the lower
ow/return temperatures are taken into account in the selection
of the type and size of the heat emitters used.
While underoor heating is the preferred heat emitter, a
combination of underoor heating and radiators, or radiators only,
works just as e󰀩ciently. It is necessary, however, to calculate the
size of radiator required accurately – if this is not done, the house
will fail to reach the target temperature and will be costly to rectify
after the installation is complete.
When tested to BS EN 14511, the heat output for an heat pump is
declared at the test conditions of 7°C outside air temperature and
35°C or 55°C water ow temperature.
At all other values of outside air temperature and water ow
temperature the actual heat pump output will vary, e.g. the heat
output will:
• decrease with lower outside air temperatures and increase
with higher outside air temperatures at any given water ow
temperature, and
• decrease with higher water ow temperatures and increase
with lower water ow temperatures at any given outside air
temperature
A back-up boiler can be added to the rated output of the heat pump.
Provided that the heat pump is sized correctly for the system, this
back-up heater will only compensate for any short fall in meeting
the heat load for the property below the minimum design air
temperatures.
3.2.2 HEAT EMITTER SIZING
For guidance on sizing heat emitters, e.g. radiators and/or
underoor heating, refer to MCS Heat Emitter Guide (MCS 021).
3.3 REGULATIONS
Installation of a Grant Aerona³ heat pump must be in accordance
with the following recommendations:
• National Building Regulations, e.g. Approved Document G
• Local Bylaws (Check with the Local Authority for the area)
• Water Supply (Water Fittings) Regulations 1999
3 Installation Information
3.1 INTRODUCTION
! NOTE !
Grant Aerona³ heat pumps should be stored and transported
in an upright position. If not, then the heat pump MUST be
positioned in an upright position for at least four hours
before being operated.
For the heat pump to operate satisfactorily, install it as outlined in
this installation manual.
• The Grant Aerona³ heat pump should only be installed by a
competent person.
• Before installing the heat pump, please read the following
installation information carefully and install the heat pump as
instructed.
• Be sure to follow the safety notices given.
• After completing the installation, check the product operates
correctly. Then, explain to the user about the operation and
maintenance requirements as shown in this manual.
• Be sure to install the heat pump in a suitable location that can
support the heat pump when lled. Installation in an unsuitable
location may cause injury to persons and damage to the heat
pump.
• Do not install in a position where there is any possibility of
ammable gas leakage such as from LPG cylinder around the
heat pump. Leaked ammable gas around the heat pump may
cause a re.
• If the leaked refrigerant is exposed to re, poisonous gas may
be produced.
• Connect the heat pump with the exible hoses and valves
supplied, as described in this installation manual.
• Do not use an extension cable.
• Do not turn on the power until all installation work is complete.
• Only use correct Grant UK parts and accessories to avoid
accidents such as electric shock, re and leakage of water.
• Never touch electrical components immediately after the power
supply has been turned o󰀨 as electrical shock may occur. After
turning o󰀨 the power, always wait ve or more minutes before
touching electrical components.
• Be sure to connect the power supply cable correctly to the
terminal block as overheating can cause a re.
• Ensure the wiring lid is tted following installation to avoid
electric shock at the terminal block.
• Always connect the earth wire to the heat pump.
• Install a correctly rated circuit breaker.
• After installation, the heat pump and heating system must
be commissioned. Hand over all documentation to the end-
user and explain the operating functions and maintenance
according to these instructions.
3.2 HEATING SYSTEM DESIGN CRITERIA
Before continuing with the installation of the Aerona³ heat pump,
please spend a few minutes conrming the suitability of the
heat pump to your system. Failure to do so may result in poor
performance and wasted time:
• Has a room-by-room heat loss calculation been carried out?
• Is this system designed for mono or bivalent?
• If monovalent, what is the total heating capacity?
• If bivalent, what is the load capacity of the heat pump?
• If bivalent, what is/are additional heat source(s)?
• Type of system design? - S-plan, S-plan plus
• Will a bu󰀨er be used?

Section 3: Installation Information Page 13
• MCS Installers Standards (if applying for the Renewable Heat
Incentive)
• MIS 3005 (Requirements for contractors undertaking the
supply, design, installation, set to work commissioning
and handover of microgeneration heat pump systems)
• MCS 020 (MCS Planning Standards)
• MCS 021 (MCS Heat Emitter Guide for Domestic Heat
Pumps)
The installation should also be in accordance with the latest edition
of the following standards and codes of Practice:
• BS 7671 and Amendments
• BS EN 12831
• BS 7593
3.4 HEAT PUMP LOCATION
3.4.1 SELECTION OF POSITION
• Consider a place where the noise and the air discharged will
not a󰀨ect neighbours.
• Consider a position protected from the wind.
• Consider an area that reects the minimum spaces
recommended.
• Consider a place that does not obstruct the access to doors or
paths.
• The surfaces of the oor (or the wall for wall mounted heat
pumps - Refer to Section 3.6) must be solid enough to support
the weight of the heat pump and minimise the transmission of
noise and vibration.
• Take preventive measures so that children cannot reach the
unit.
• Install the heat pump in a place where it will not be inclined
more than 5°.
• When installing the heat pump where it may exposed to strong
wind, brace it securely.
• Aerona³ heat pumps are now suitable for installation in coastal
areas without any special treatment.
Decide the mounting position as follows:
1. Install the heat pump in a location which can withstand the
weight of the heat pump and vibration. Please make sure it is
installed level.
2. Will a Grant external volumiser be tted behind the heat pump?
(Refer to installation instructions supplied with the external
volumiser for more details). The Grant external volumiser is not
suitable for units that have been wall mounted.
3. Provide the indicated space to ensure good airow. (Refer to
Section 3.5.2).
4. Do not install the heat pump near a source of heat, steam or
ammable gas.
5. During heat pump operation, condensate water ows from the
heat pump. Therefore, install the heat pump in a place where
the condensate water ow will not be obstructed.
6. Do not install the heat pump where strong wind blows directly
onto the heat pump or where it is very dusty.
7. Do not install the heat pump where people pass frequently.
8. Install the heat pump in a place where it will be free from
adverse weather conditions as much as possible.
3.4.2 NOISE LEVEL
All heat pumps make a noise. Discuss the potential nuisance factor
with the end-user when considering the nal position of the heat
pump. Take opening windows and doors into account. It is not
essential for the heat pump to be positioned next to a wall of the
house. Behind an out-building may be more suitable so discuss the
options with the end-user.
3.4.3 ORIENTATION
The North face of the building will usually have colder ambient air
than any other side. To ensure maximum e󰀩ciency from the Grant
Aerona³ heat pump, position the heat pump on a warmer side. In
order of preference, site the heat pump on a South face followed by
either South East or South West, then by East or West. Only install
on a North face if there is no other alternative.
3.5 PREPARATION FOR INSTALLATION
3.5.1 BASE
Unless the heat pump is to be wall mounted (refer to Section 3.6 for
further information), it should be installed on a rm at level surface
capable of supporting the weight of the heat pump and minimising
the transmission of noise and vibration, for example:
• A at trowelled concrete base 150mm thick.
• Paving slabs on compacted hard core of a su󰀩cient depth for
the ground condition.
This surface should extend at least 150mm beyond the heat pump
on three sides.
If this surface is level with or above the damp course for the
building, leave a gap of approximately 150mm between the edge of
the base and the wall of the house to avoid bridging the DPC.
The heat pump should NOT be installed on loose or uneven
surfaces such as grass, soil, shingle or gravel.
The heat pump must be raised up from the surface of the base by
approximately 100mm on suitable anti vibration mounts or blocks.
3.5.2 CLEARANCES
The following minimum clearances must be used to enable the
product to be easily commissioned, serviced and maintained and
allow adequate air ow in and out of the heat pump.
Refer to Table 3-1 and Figure 3-1.
Table 3-1: Clearances
Aspect Minimum clearance required (mm)
Top 300
Bottom Approximately 100*
Front 600
Rear 300
Left 100
Right 600
* Height of A/V mounts (product code: HPIDFOOT/KIT)
If the heat pump is to be wall mounted the rear clearance can be
reduced to 150mm. Refer to Section 3.6 for further information on
wall mounting Grant Aerona³ heat pumps.
003revO mm
Over 600 mm
Over 100 mm
Over 300 mm
Over 600 mm
HPID12
Figure 3-1: Clearances (applicable to all models)

Section 3: Installation InformationPage 14
3.7 INSTALLING THE HEAT PUMP
3.7.1 INSULATION
The complete water circuit, including all pipework, must be
insulated to prevent heat loss reducing the e󰀩ciency of the heat
pump and also to prevent damage due to frozen pipes.
3.7.2 CONNECTING THE HEATING SYSTEM TO THE
HEAT PUMP
• Water connections must be made in accordance with diagrams
in this manual and the labels on the heat pump.
• Be careful not to deform the heat pump pipework by using
excessive force when connecting.
• Pipework should be ushed before connecting the heat pump.
• Hold the pipe end downwards when removing burrs.
• Cover the pipe end when inserting it through a wall so that no
dust and dirt can enter.
• The heat pump is only to be used in a sealed heating
system. It must not be used as part of an open-vented
system.
Before continuing the installation of the heat pump, check the
following points:
• The maximum system water pressure is 3 bar.
• Make sure the hose is connected to the pressure relief valve to
avoid any water coming into contact with electrical parts.
• Air vents must be provided at all high points of the system. The
vents should be located at points which are easily accessible
for servicing. An automatic air purge valve is provided inside
the heat pump. Check that the air purge valve can operate.
• Take care that the components installed in the pipework can
withstand the water pressure.
3.7.3 SLEEVING FOR PIPES AND CABLES
All pipes passing through external walls should be individually
sleeved, using either copper or plastic pipe for the sleeve.
The inside diameter of this sleeving should be large enough to
accommodate the insulation on heating system pipes, usually at
least 6mm larger than the outside diameter of the insulation.
It is important that the sleeve is correctly built into the wall structure
using a cement mortar or suitable ller.
The annular gap between the pipe/insulation and the sleeve
should be even all round with at least one end sealed with a mastic
sealant, to prevent the ingress of water or vermin whilst allowing
the pipe to move and maintain the re-resistant properties of the
structure.
Whilst not essential, it is also recommended as good practise to
sleeve any cables passing through external walls, following the
basic requirements as given above. This will make it easier to
remove/replace any cables in future, should it be necessary.
3.7.4 SYSTEM CONNECTIONS
The system connections of the heat pump must be carried out using
the exible hoses, valves and ttings supplied with the heat pump.
The hydraulic circuit must be completed following the
recommendations below:
1. It is important to install the isolation valves between the heat
pump and the building.
2. The ow regulator (supplied with the heat pump) must be
installed on the return to the heat pump. Refer to Figure 4-1
and Section 9.13.
3. The system must have drain cocks in the lowest points.
4. Air vents must be included at the highest points of the system.
5. A system pressure gauge must be installed upstream of the
heat pump.
6. All pipework must be adequately insulated and supported.
7. The presence of solid particles in the water can obstruct the
heat exchanger. Therefore, protect the heat exchanger using a
magnetic lter such as a Grant Mag-One.
3.5.3 CONDENSE DISPOSAL
The underside of the heat pump has a condensate outlet (refer to
Figure 3-2) that allows any condensate to drain from the heat pump.
Provision must be made to safely collect and dispose of the
condensate.
For example, use 40 mm waste pipe to form a condensate disposal
system into which the condensate ows from the opening in the
bottom of the heat pump casing running to a suitable gulley or
soakaway.
! WARNING !
It is essential that the condensate is able to drain away and
not allowed to run onto any adjacent paths or driveways
where, in winter, this will result in icing and a potential haz-
ard for anyone walking near the heat pump.
The top of the concrete base must be either level with, or
above, the surrounding ground level.
Condensate outlet
Figure 3-2: Condensate outlet
3.5.4 VIBRATION
If the vibration from the heat pump is likely to cause a nuisance, use
the anti-vibration mounts (product code: HPIDFOOT/KIT2) and x
the heat pump securely to the mounts. These anti-vibration mounts
are not suitable for units that have been wall mounted.
3.6 WALL MOUNTED INSTALLATIONS
All four sizes of Grant Aerona³ heat pump can be wall mounted at a
safe height, with the top of the unit no more than 2m above ground
level, where no specialist access equipment (such as mobile tower
or sca󰀨olding) is required to provide a safe working place to carry
out servicing or repairs.
Grant UK can supply a suitable mounting bracket for the HPID6R32
and HPID10R32 models (product code: HPIDWALLBRKT2). This
has a maximum Safe Working Load of 90kg and is thus suitable for
both the HPID6R32 and HPID10R32 heat pumps only.
If any other method of wall mounting is used, for example with the
HPID13R32 and HPID17R32 heat pumps, it is the responsibility of
the installer to select a suitable mounting method. Grant UK cannot
take any responsibility for any mounting brackets other than the one
supplied.
In all cases, care should be taken to determine that the condition of
the wall is suitable to carry the load imposed by the heat pump and
ensure that the mounting bracket is rmly secured to the wall, using
suitable xings for the wall construction concerned.
If installed in a position where specialist access equipment, such as
a mobile tower or sca󰀨olding, is required to provide a safe place of
work to carry out servicing or repairs, then the cost and provision
of this equipment is the responsibility of the property owner/user
irrespective of whether the heat pump is deemed to be at fault or
not.

Section 3: Installation Information Page 15
To determine the temperature di󰀨erence between ow and return,
check the ow and return temperatures using the ‘Monitor Display
Function’ on either the remote controller or Terminal PCB. Refer
to Section 10.7 for guidance on how to check the ow and return
water temperatures.
3.10 HYDRAULIC DIAGRAMS
Hydraulic diagrams are available in Figure 4-1 and Appendices A, B
and C at the back of these installation instructions.
8. After system assembly ush and clean the whole system,
paying particular attention to the state of the lter.
9. A new installation must be thoroughly ushed and cleaned
before lling and adding anti-freeze/biocide/inhibitor.
3.7.5 REMOTE CONTROLLER
For details on how to install the remote controller, refer to Section 7.
For setting, refer to Section 9.
! WARNING !
Do not use the heat pump to treat industrial process water,
swimming pool water or domestic drinking water. Install an
intermediate heat exchanger for all of the above cases.
3.8 METERING REQUIREMENTS
The MCS Heat Pump Standard (Installation) MIS3005-I requires
that:
1. A means of recording and displaying the total electricity
consumption of the system shall be installed.
2. The heat pump(s) should be installed so that heat metering
could be added at a future date with minimum cost or
disruption.
A means of making the addition of heat metering possible with
minimum disruption would be to include straight and surface
mounted ow and return pipes near the heat pump and each
incorporate two full bore isolation valves.
Those isolation valves on the ow pipe should be separated by no
less than 175mm.
On the return pipe, those valves should be separated by no less
than 20x the pipe diameter.
For example, the distance between the valves should be 560mm or
more of straight pipe when pipe diameter of 28mm is used.
3.9 VOLUMISER TANKS
A ‘Volumiser’ tank is simply a vessel used to increase the volume
of the system, to meet the system requirements as given below.
It will have only two connections, one inlet and one outlet,
and it must be tted in the ow from the heat pump if the
volumiser contains an immersion element that is to be used as a
supplementary heater.
A weatherproof, insulated 30 litre ‘Volumiser’ tank designed for
external installation and suitable for this purpose, is available from
Grant UK (product code: HPIDVOL30EXT). For further information,
please contact Grant UK on [phone].
Refer to Figure 4-1 and Table 4-1.
System Conditions
A ‘Volumiser’ tank is required for all Grant Aerona³ R32 heat pump
installations, except when the heat pump is connected to a Grant
combined volumiser/low loss header, bu󰀨er or thermal store.
For further information on the Grant combined volumiser/low loss
header, please refer to Grant UK DOC 0184 (supplied with the
volumiser/low loss header).
The water pump, tted in the heat pump, is supplied factory set at
Level 3 (maximum output). It is unlikely that this level of output will
be required, so it is recommended that the pump output is reduced
to either Level 2 (medium output) or Level 1 (minimum output) as
required. This will usually be indicated by achieving a temperature
di󰀨erence between the heat pump ow and return of approximately
8°C when the heating system is operating and up to temperature.
Refer to Section 8.3.6 for guidance on how to change the pump
output level.

Section 3: Installation InformationPage 16
3.11 BEFORE YOU COMMISSION
3.11.1 FLUSHING AND CORROSION PROTECTION
To avoid the danger of dirt and foreign matter entering the heat
pump the complete heating system should be thoroughly ushed
out – both before the heat pump is operated and then again after
the system has been heated and is still hot.
This is especially important where the heat pump is installed as
a replacement for a boiler on an existing system. In this case the
system should be rst ushed hot, before the old boiler is removed
and replaced by the heat pump.
For optimum performance after installation, this heat pump and
the central heating system must be ushed 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.
After ushing, a suitable thermal uid should be used, such as
Grant HPC thermal uid (Grant UK product code: INHIB03),
specically designed for use in air source heat pump installations.
This provides long term protection against corrosion and scale as
well as the risk of the freezing in the external section of the heating
system (i.e. the exible hoses, condenser and circulating pump
within the heat pump casing) in the event of power failure during
winter months.
In order to avoid bacterial growth, due to the lower system
operating temperatures in heat pump systems, a suitable biocide
should be used in conjunction with the thermal uid.
As Grant HPC thermal uid already contains a biocide, no
separate biocide is required.
The thermal uid, and separate biocide when required, should be
added to the system water when nally lling the heating system.
The level of frost protection depends on the percentage
concentration of thermal uid used.
Grant recommends using a thermal uid concentration to give a
MINIMUM level of frost protection of -10°C, and down to lower
temperatures than this where local conditions are more severe.
With Grant HPC uid, to ensure good corrosion protection, a
concentration of 25% by volume is recommended. This provides
antifreeze protection to -12°C. Refer to Table 3-3 below for details
of concentration v antifreeze protection.
Table 3-3: Antifreeze protection levels using Grant HPC uid
% Grant HPC
by volume 20 25 30 35 40 45
Freeze point °C -10 -12 -15 -20 -25 -30
IMPORTANT: Mixtures with a concentration of more than 70%
by volume of Grant HPC in water are NOT recommended
because the physical properties i.e. heat transfer, are no
longer su󰀩cient.
Always follow the manufacturers instructions on the correct use of
thermal uids and biocides.
Failure to implement the guidelines outlined in Section 3.11.1
for fully ushing the system and using a suitable thermal uid to
provide adequate protection against corrosion, scale, bacterial
growth and freezing will invalidate the heat pump product
guarantee.
Table 3-4: Antifreeze concentration
% Monoethylene glycol inhibitor 20% 25% 30% 35% 40% 45%
Freezing temperature* -10°C -12°C -15°C -20°C -25°C -30°C
Correction
factor
Capacity 0.995 0.990 0.985 0.980 0.975 0.970
Power absorbed 0.990 0.989 0.984 0.982 0.975 0.968
Pressure drop 1.051 1.060 1.065 1.071 1.077 1.080
* The temperature values are indicative. Always refer to the temperatures given for the specied product used.
For details of how to access the parameter settings, refer to Section 9.3.
Grant Engineering (UK) Limited strongly recommends that a
Grant Mag One in-line magnetic lter/s (or equivalent*) is tted
in the heating system pipework. This should be installed and
regularly serviced in accordance with the lter manufacturer’s
instructions.
* As measured by gauss. The Mag One magnetic lter has a gauss
measurement of 12000.
3.11.2 ANTI-FREEZE FUNCTION SETTING
This function is factory set to ON, i.e. DIP SW1 is set to ON (up
position).
With the frost protection function set to ON, it will operate as
described in Sections 8.4.1, 8.4.2 and 8.4.3.
This function is not required if ethylene glycol is used in the heating
system water to prevent freezing.
If a suitable concentration of ethylene glycol (heating system
antifreeze) is used in the system water. Refer to Tables 3-2 & 3-3
for suitable antifreeze concentrations or follow the manufacturer’s
instructions supplied with the antifreeze.
If not required, frost protection function can be disabled as follows:
• Remove the wiring cover at the right hand end of the heat
pump. Refer to Figure 6-1.
• Set DIP SW1 to OFF (down position). Refer to Figure 3-6.
• Replace the wiring cover and secure in place with the screws
provided.
Terminal PCB
ON
1
OFF
DIP SW. position
2 3 456 7 8
Figure 3-6: Anti-freeze function setting
! NOTE !
When using thermal uids and biocides, ensure that the
volume of any volumisers, bu󰀨ers and thermal stores
are taken into account, in addition to the heating system
pipework, when determining how much is required to
correctly dose the system.
! NOTE !
Dip switch positions:
Up: ON
Down: OFF
Refer to Sections 8.4.1, 8.4.2 and 8.4.3.

Section 3: Installation Information Page 17
Ensure that these installation and servicing instructions and the
user instructions are handed over to the householder.
3.13 INSTALLATION CHECKLIST
Location and positioning
• The vibration damping feet/shoes are tted (if supplied)
• The heat pump is xed to the surface or mountings that it rests
on
• Maintenance clearances comply with those given in this
manual
• The position of the remote controller complies with the
guidance given in this manual
• All safety requirements have been complied with
Water circuit pipework and appliances
• Water connections have been carried out as per the
information in this manual
• All water connections are tight with no leaks
• The magnetic in-line lter is installed on the primary circuit
return as close to the heat pump as possible but still within
the building and in a position that is easy to access for
maintenance
• The pressure gauge with a suitable scale is installed on the
sealed system pipework or expansion vessel manifold
• The connection pipes are suitably supported so that these do
not weigh on the appliance
• The expansion vessel installed on the heating circuit is suitably
sized
• Volumiser tank is installed unless a bu󰀨er, thermal store or
bu󰀨er cylinder is connected to the heat pump (refer to Section
3.9).
• The water circuit has been thoroughly ushed
• The air vent valves are installed at the highest points on the
system
• There is no air in the system (vent if necessary)
• The shut o󰀨 valves are installed on the inlet/outlet of system
circuit
• The drain valves are installed at the lowest points in the
system
• The exible hoses are installed on the inlet/outlet of system
circuit
• The system water content complies with the specication in the
manual
• The DHW immersion heater has been installed in DHW tank
for Legionella prevention
• Suitable water ow rate for operation of the entire heat pump is
achieved as specied in this manual. Refer to Section 9.12
• All pipes are insulated with suitable vapour barrier material to
prevent formation of condensation and heat loss, with control
and shut-o󰀨 devices protruding from the insulation
• The ow regulator (supplied) is tted on the return pipe to the
heat pump. Refer to Section 9.13 for further information.
Electrical connections
• All electrical connections are secure
• Electrical connections have been carried out correctly
• Voltage is within a tolerance of 10% of the rated voltage for the
heat pump (230V)
• Electrical power supply complies with the data on the rating
plate and as specied in the manual
• The earth wires are connected securely
To do this, use the remote controller as follows (refer to Section
9.1):
First access the Installer level:
1. Press and hold the Menu l and the – or + o buttons together
for 3 seconds to enter the installer level.
2. “InSt” parameter number “00 00” and parameter value “---
-“ will be shown on the display. The rst two digits of the
parameter number will be blinking.
Then, access the Service level:
1. Use the Up or Down q buttons to change these rst two digits
to 99 and then press the + button o.
2. The second two digits will then blink. Use the Up or Down q
buttons to change these two digits to 99 and then press the
Set button p.
3. The parameter value on the display will now be ‘0’.
4. Use the ‘Up’ and ‘Down’ (8) buttons to change the parameter
value to “738” and then press the ‘Set’ (7) button.
Now, reset the value for parameter 4300 to 0 (disabled):
1. The rst two digits of the 4-digit parameter number (the
parameter group number) will blink.
2. Set the parameter group number to 43 using the Up or Down
qbutton.
3. Press the + buttons oand the second two digits (the
parameter code) will blink.
4. Set the parameter code number to 00 using the Up or Down
qbutton.
5. Press Set button pand the parameter value 4300 (1 =
enabled) will be displayed and will blink.
6. Reset the parameter value 4300 to 0 (disabled) using the Up
or Down qbutton.
Repeat this process to reset the values of parameters 4310, 4320
and 4330 to 0.
Return to normal operation:
Press and hold the Menu land the –or +obuttons together for
3 seconds or simply leave the remote controller for 10 minutes.
! NOTE !
Do NOT disable the heat pump antifreeze function unless
a suitable concentration of glycol is present in the system
water. Refer to Tables 3-2 & 3-3. If there are any leaks of
water from the heating system and the system requires
topping up then the concentration of ethylene glycol must
be checked and topped up as required.
Failure to follow this instruction will invalidate the product
guarantee.
3.12 COMPLETION
Please ensure that the heat pump commissioning form (supplied
with the heat pump) is completed in full and that it is signed by the
householder/user.
Leave the copy with the user and retain one copy for your own
records.
Table 3-5: Frost protection parameters
Level Parameter Function description Display and input value Remarks
Group Code Default Min. Max. Unit
S 43 00 Frost protection on room temperature
0=disable 1=enable 1 0 1 -
S 43 10 Frost protection by outside temperature
0=disable 1=enable 1 0 1 -
S 43 20 Frost protection based on outgoing water temperature
0=disable 1=enable 1 0 1 -
S 43 30 DHW storage frost protection
0=disable 1=enable 1 0 1 -

Page 18
4.1 SEALED SYSTEM REQUIREMENTS
4 Sealed Systems
Table 4-1: Key to Figure 4-1
Key Description
1Grant Aerona³ ASHP
2 Flexible hose
3 Isolation valve
4 Flow regulator
5Mag One magnetic lter
6 Volumiser
6a Grant External Volumiser
7 Drain point
8Removable lling loop
9 Double check valve
10 Pressure gauge
11 Expansion vessel
12 Pressure relief valve
13 Tundish
14 Automatic system by-pass
15 Motorised 2-port valve (DHW)
16 Automatic air vent
17 DHW cylinder
18 Motorised 2-port valve (CH)
19 Additional circulating pump
(refer to Section 8.3.7)
20 Thermostatic radiator valve
All Grant Aerona³ heat pumps must be used with sealed systems
complying with the requirements of BS EN 12828, BS EN 12831
and BS EN 14336.
The system must be provided with the following items:
• Diaphragm expansion vessel complying with BS EN 13831
• Pressure gauge
• Pressure relief (safety) valve
• Approved method for lling the system
Expansion vessel
The expansion vessel can be tted in either the return or ow
pipework in any of the recommended positions as shown in Figure
4-1. To reduce the operating temperature of the expansion vessel,
position it below the pipe to which it is connected.
The expansion vessel may be positioned away from the system,
providing the connecting pipe is not less than 13 mm diameter. If
the expansion vessel is connected via a exible hose, care must
be taken to ensure that the hose is not twisted.
! NOTE !
Ensure that the expansion vessel used is of su󰀩cient size
for the system volume.
Refer to BS 7074:1:1989 or The Domestic Heating Design
Guide for sizing the required vessel.
Figure 4-1: Sealed System heating components
Section 4: Sealed Systems
Scale: NTS
Paper Size: A3
Project Title: ASHP with Volumiser
Drawing Set: ASHP Pipe Schematics
Status: Approved
Rev Date: 25/04/22 Drawn By: CG Checked By: PS
Dwg. No. HPPS0001
Revision: 1.4
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.
Hopton House, Hopton Industrial Estate, Devizes, Wiltshire, SN10 2EU, tel; 01380 736920
Item Description
1 Grant Aerona³ ASHP
2 Flexible hose
3 Isolation valve
4 Flow regulator
5 Magnetic lter
6 Volumiser (with no immersion
element)
6a Grant External Volumiser
7 Drain point
8 Removable lling loop
9 Double check valve
10 Pressure gauge
11 Expansion vessel
12 Pressure relief valve
13 Tundish
14 Automatic system bypass
15 Motorized 2-Port valve (DHW)
16 Automatic air vent
17 DHW cylinder
18 Motorized 2-Port valve (SH)
19 Additional circulating pump
20 Thermostatic radiator valve
110
89
7
23
5
3
23
11
20
16
17 18
15
12
13
14
Optional
33
19
4
6
3
23
1
6a
IMPORTANT
If the external volumiser arrangement
is used, (see item 6a below) then
item 6 in the adjacent schematic will
not be required.
Revision Details:
1.4 25/04/22 Approved

Page 19
Pressure Gauge
The pressure gauge must have an operating range of 0 to 4 bar.
It must be located in an accessible place next to the lling loop for
the system.
Safety Valve
The safety valve (provided with the heat pump) is set to operate
at 3 bar. It should be tted in the ow pipework near to the heat
pump.
The pipework between the safety valve and heat pump must be
unrestricted, i.e. no valves. The safety valve should be connected
to a discharge pipe which will allow the discharge to be seen, but
cannot cause injury to persons or damage to property.
Filling Loop
Provision should be made to replace water lost from the
system. This can be done manually (where allowed by the local
water undertaking) using an approved lling loop arrangement
incorporating a double check valve assembly.
The lling loop must be isolated and disconnected after lling the
system.
Heating System
The maximum ‘setpoint’ temperature for the central heating water
is 55°C.
An automatic air vent should be tted to the highest point of the
system.
If thermostatic radiator valves are tted to all radiators, a system
by-pass must be tted. The by-pass must be an automatic type and
correctly set when the system is commissioned.
All ttings used in the system must be able to withstand pressures
up to 3 bar. Radiator valves must comply with the requirements of
BS 2767:1991.
One or more drain taps (to BS 2879) must be used to allow the
system to be completely drained.
4.2 FILLING THE SEALED SYSTEM
Filling of the system must be carried out in a manner approved by
the local Water Undertaking.
! WARNING !
Only ever ll or add water to the system when it is cold and
the heat pump is o󰀨. Do not overll.
The procedure for lling the sealed system is as follows:
1. Check the air charge pressure in the expansion vessel
BEFORE lling the system.
The expansion vessel charge pressure should always be
approximately 0.2 bar lower than the maximum static head of
the system, at the level of the vessel (1 bar = 10.2 metres of
water).
Refer to Figure 4-1.
The charge pressure must not be less than the actual
static head at the point of connection.
2. Check that the small cap (or screw) on all automatic air vents
is open at least one turn. The cap (or screw) remains in this
position until lling is completed and then it is closed.
3. Remove the top (HPID6R32) and front right (HPID10R32,
HPID13R32 and HPID17R32) casing and loosen the plug on
the automatic air vent located inside the heat pump. Refer to
Figure 4-2.
loosen
tighten
Auto air vent
Plug
Figure 4-2: Auto Air Vent
4. Ensure that the exible lling loop is connected and that the
double check shut o󰀨 valve connecting it to the water supply is
closed. A valve is open when the operating lever is in line with
the valve, and closed when it is at right angles to it.
5. Open the ll point valve.
6. Gradually open the double check valve from the water supply
until water is heard to ow.
7. When the needle of the pressure gauge is between 0.5 and
1.0 bar, close the valve.
8. Vent each radiator in turn, starting with the lowest one in the
system, to remove air.
9. Continue to ll the system until the pressure gauge indicates
between 0.5 and 1.0 bar. Close the ll point valve. The system
ll pressure (cold) should be 0.2 - 0.3 bar greater than the
vessel charge pressure – giving typical system ll pressures
of approx 0.5 bar for a bungalow and 1.0 bar for a two storey
house.
Refer to the Domestic Heating Design Guide for further
information if required.
10. Repeat steps 8 and 9 as required until system is full of water
at the correct pressure and vented.
11. Water may be released from the system by manually
operating the safety valve until the system design pressure is
obtained.
12. Close the ll point and double check valves either side of the
lling loop and disconnect the loop.
13. Check the system for water soundness, rectifying where
necessary.
! NOTE !
The air charge pressure may be checked using a tyre
pressure gauge on the expansion vessel Schraeder valve.
The vessel may be re-pressurised, when necessary, using a
suitable pump. When checking the air pressure, the water in
the heating system must be cold and the system pressure
reduced to zero.
4.3 PRESSURE RELIEF (SAFETY) VALVE
OPERATION
Check the operation of the pressure relief (safety) valve as follows:
1. Turning the head of the valve anticlockwise until it clicks. The
click is the safety valve head lifting o󰀨 its seat allowing water
to escape from the system.
2. Check that the water is escaping from the system.
3. Top-up the system pressure, as necessary.
! NOTE !
The expansion vessel air pressure, system pressure and
operation of the pressure relief valve must be checked on
each service. Refer to Section 10
Section 4: Sealed Systems

Page 20
5.1 TEMPERATURE CONTROL
If a DHW demand is made, the heat pump will continue to provide
space heating for a minimum period of 15 minutes (parameter 3122
- refer to Table 5-1). If space heating is already being demanded
and has been on for this minimum period, then the heat pump will
change over to prioritise DHW.
In either case, once DHW is being provided, the ow temperature
will target 55°C, irrespective of the space heating target
temperature. Also note that there is no weather compensation
control when in DHW mode.
The time limit for DHW can be set using parameter 3121. The
default setting is 60 minutes. After this time period has been
reached, the heat pump will default back to the original demand that
was in place prior to the DHW demand or to a stand by state if the
change is demand state occurred during the DHW demand.
If the unit times out on parameter 3121, remember the motorised
valve of the DHW circuit will remain open as it is controlled by
the cylinder thermostat and not the heat pump and will not heat
up to the correct temperature when using the space heating ow
temperature. It is also possible that the cylinder could be robbed of
heat to the space heating circuit if the stored water is hotter than the
ow temperature to the space heating circuit.
If the motorised valve for space heating is open during DHW
demand, the 55°C ow temperature will also enter the space
heating circuit, increasing the recovery time of the cylinder.
To minimise this high temperature period and higher than normal
running costs, ensure that space heating and DHW demand times
to not occur simultaneously.
5 Domestic Hot Water
Table 5-1: DHW and space heating parameters
Level Parameter Function description Display and input value Remarks
Group Code Default Min. Max. Unit
I 31 21 Maximum time for DHW request 60 0 900 1 min
I 31 22 Minimum time for space heating 15 0 900 1 min
For details of how to access the parameter settings, refer to Section 9.3.
5.2 QUICK RECOVERY CYLINDERS
As the water temperature from the heat pump is lower than from
a traditional system using a boiler, a much larger coil is required
inside the cylinder to transfer the heat e󰀩ciently.
Grant UK has developed a range of “Quick Recovery” hot water
cylinders for use with a heat pump.
In order to ensure that a minimum of at least 8K temperature
di󰀨erence is maintained between cylinder ow and return, the
correct Grant UK Quick Recovery cylinder must be selected to
match the heat pump output.
Failure to use the correct cylinder can result in a reduced heat
transfer in the cylinder and a lower temperature di󰀨erential.
Section 5: Domestic Hot Water