Grant HPiD6, Aerona3 Series, HPiD16, HPiD10 Installation And Servicing Instructions

UK | DOC 0109 | Rev 2.0 | June 2017

Grant Aerona³

Air to Water High Efficiency Heat Pump Range

Installation and Servicing Instructions

GRANT ENGINEERING (UK) LIMITED

Hopton House, Hopton Industrial Estate, Devizes, Wiltshire, SN10 2EU
Tel: [phone] Fax: [phone]
Email: [e-mail] www.grantuk.com

This manual is accurate at the date of printing but will be superseded and should be disregarded if specifications and/or appearances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 official Conditions of Sale, a copy of which may be obtained on application.
© Grant Engineering (UK) Limited 2017. No part of this manual may be reproduced by any means without prior written consent.

Important Note for Installers

This manual is intended to guide Installers on the installation,
commissioning and servicing of the Grant Aerona³ air source heat
pump.

A separate manual is available to guide users in the operation of the
heat pump.

Special Text Formats

The following special text formats are used in this manual for the
purposes listed below:

Warning of possible human injury as a consequence of not
following the instructions in the warning.

!

WARNING

Caution concerning likely damage to equipment or tools as a
consequence of not following the instructions in the caution.

!

CAUTION

Used for emphasis or information not directly concerned with
the surrounding tex t but of impor tance to the reader.

NOTE

!

Contents

1 Introduction 4

1.1 General 4

1.2 Outputs 4

1.3 Main Components 4

1.4 Planning Permission 4

1.5 DNO Application 4

1.6 Servicing 4

1.7 Important Advice 4

1.8 Product Contents 4

1.9 Installation Accessories 4

1.10 Control Parameters 4

1.11 Heat Pump Components 5

2 Technical Data 6

1.1 Heat Pump Technical Data 6

2.2 Main Supply Cable 6

2.3 Heat Pump Dimensions 7

2.4 Remote Controller Dimensions 8

3 Installation Information 9

3.1 Introduction 9

3.2 Heating System Design Criteria 9

3.3 Regulations 10

3.4 Heat Pump Location 10

3.5 Preparation for Installation 10

3.6 Installing the Heat Pump 12

3.7 Metering for Domestic RHI Installations 12

3.8 Buffer Tanks 12

3.9 Hydraulic Diagrams 13

3.10 Before you Commission 14

3.11 Completion 15

3.12 Installation Checklist 15

4 Sealed Systems 16

4.1 Sealed System Requirements 16

4.2 Filling the Sealed System 17

4.3 Pressure Relief (Safety) Valve Operation 17

5 Domestic Hot Water 18

5.1 Temperature Control 18

5.2 Heat Pump Cylinders 18

5.3 Legionella 19

5.4 Automatic DHW Boost Kit 19

6 Electrical 22

6.1 Wiring Centre 22

6.2 Terminal PCB Input/Output 23

6.3 Power Supply 23

6.4 Tightening Torques 25

6.5 Solar Thermal 25

6.6 Connection of Heating System Controls 25

6.7 Connection of Remote Controller 25

6.8 Wiring Diagrams 25

6.9 System Control Wiring Diagrams 26

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 40
Contact

8.6 ON/OFF Heating Remote Contact 41

8.7 Night Mode 42

8.8 Low Tariff 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 Coastal Installations 47

10 Servicing 48

10.1 General 48

10.2 Air Inlet and Outlet 48

10.3 Condensate Disposal 48

10.4 Heating System Connections 48

10.5 Heat Pump Controls 48

10.6 Refrigerant 48

10.7 Monitor Display Function 49

11 Fault Finding 50

11.1 Error Code Display 50

11.2 Error History Display 50

11.3 Reset Error Code Display 50

11.4 Error Codes 51

11.5 Table of Controller PCB and Terminal 54
PCB Alarms

11.6 Error Codes and PCB Alarm Figures 55
and Tables

12 Spare Parts 58

12.1 Exploded Diagram - HPID6 58

12.2 Spare Parts List - HPID6 59

12.3 Exploded Diagram - HPID10 60

12.4 Spare Parts List - HPID10 61

12.5 Exploded Diagram - HPID16 62

12.6 Spare Parts List - HPID16 63

13 Declaration of Conformity 64

14 Health and Safety Information 65

14.1 General 65

14.2 Refrigerant (410A) 65

15 Disposal and Recycling 65

16 Product Fiches 66

17 Guarantee 72

Appendix A - Parameters List 74

Appendix B - Wiring Diagrams 76

Appendix C - Parameters 78
Record

Contents Page 3

Section 1: IntroductionPage 4

1.1 General

The Grant Aerona³ range consists of three compact, light weight, MCS
approved, monobloc, air-to-water, inverter driven, single-phase air
source heat pumps working with R410A refrigerant.

It is important that these installation and ser vicing instructions are
followed to ensure correct installation and operation. Failure to do so
may result in poor performance.

It is not within the scope of this manual to design the heating system
or provide any advice regarding the layout of the system or any of the
controls required for any individual heating system.

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,
buffers, etc.

These instructions must be left with the product for future
reference.

1.2 Outputs

There are three models in the Aerona³ range as follows:

• HPID6 - 6kW*

• HPID10 - 10kW*

• HPID16 - 16kW*

* at 7°C air and 35°C flow temperature

1.3 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/off times of the
compressor, keeping the water temperature constant during
operation reducing the electricity consumption.

• Compressor - a high-ef ficiency DC twin-rotary compressor to

provide smooth performance and quiet operation.

• Plate heat exchanger (condenser) - the high-efficiency plate

heat exchanger is used to transfer heat to the heating system
primary circuit.

• Fan - a high-ef ficiency DC fan motor is used for smooth and

quiet operation. A single fan is fitted to the 6kW (5 blade) and
10kW (3 blade) units. Two fans (3 blade) are fitted to the 16kW
unit.

• Circulating pump - high-ef ficiency DC pump speed controlled

from the ASHP control PCB.

• Base tray heater - factory fitted 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 off (ΔT of 3k). This cannot be
adjusted or turned off.

• Pressure relief valve - a 3 bar pressure relief valve is factor y

fitted.

• Air purge valve (automatic air vent) - factor y fitted to assist

in the removal of air from the heating primary circuit of the heat
pump.

1.4 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 w w w.planningportal.gov.uk.

1 Introduction

1.5 DNO Application

An application must be made to the Distribution Network Operator
(DNO) before connecting the heat pump(s) to the mains electrical
supply. 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 concerned.

The necessary information required to make this application (J-forms)
can be downloaded from the Grant UK website (ww w.grantuk.com),
completed and then submitted to the correct DNO for the area in
question.

1.6 Servicing

It is recommended (and a requirement of the product guarantee) that
the heat pump should be regularly serviced, at least once a year and
the details entered in the Service Log by the service engineer.

1.7 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 qualified
heating engineer or from Grant UK. Please note that Grant UK
will not be able to offer specific advice about your system unless
we designed it. In this case, we will always refer you to seek the
advice of a qualified 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.

1.8 Product Contents

The Aerona³ comes supplied on a single pallet. The following items
are included:

• 1 x Heat pump

• 1 x Condensate drain elbow

• 4 x Anti-vibration shoes (6kw only)

• 2 x Flexible hoses (6kW: 22mm, 10kW: 28mm, 16kW: 35mm)

• 2 x Isolating valves (6kW: 22mm, 10kW: 28mm, 16kW: 35mm)

• 1 x Remote controller

• 1 x Remote controller cable (length: 8 metres)

• 1 x Installation and servicing instructions

• 1 x User instructions

3

The following are available from Grant UK:

Product code Description

HPIDFOOT/KIT Anti-vibration mounts (2 x 600mm and fixing kit)

HPIDINSU/KIT Through wall insulation kit (22 - 28mm flexible hoses)

1.10 Control Parameters

All parameters are listed sequentially in Appendix A.

Section 1: Introduction Page 5

1.11 Heat Pump Components

Air inlet is located in the left and rear of the unit

Air outlet

Wiring cover

Screw

Air inlet is located in the left and rear of the unit

Air outlet

Wiring cover

Screw

Air inlet is located in the left and rear of the unit

Air outlet

Wiring cover

Screw

Terminal PCB

Auto-air vent

Terminal block

Pump

Compressor

Pressure relief valve

Main PCB

Main PCB

Terminal PCB

Terminal block

Pump

Pressure relief valve

Auto-air vent

Compressor

Terminal PCB

Pressure relief valve

Auto-air vent

Terminal block

Pump

Compressor

Main PCB

Figure 1-1: Main components (external) - 6kW

Figure 1-2: Main components (external) - 10kW

Figure 1-3: Main components (external) - 16kW Figure 1-6: Main components (internal) - 16kW

Figure 1-5: Main components (internal) - 10kW

Figure 1-4: Main components (internal) - 6kW

Section 2: Technical DataPage 6

2.1 Heat Pump Technical Data

Table 2-1: Technical data

Model Unit HPID6 HPID10 HPID16

Heating capacity (BS EN 14511 - air: 7°C / water: 35°C) kW 6.0 10.0 16.0

COP (BS EN 14511 - air: 7°C / water: 35°C) 4.11 4.35 4.10

SCOP (average climate conditions) - 35°C 4.34 4.35 4.19

Heating capacity (BS EN 14511 - air: 7°C / water: 55°C) kW 5.38 9.0 13.3

COP (BS EN 14511 - air: 7°C / water: 55°C) 2.59 2.71 2.67

SCOP - average climate conditions (BS EN 14825 - water: 55°C) 3.15 3.15 3.15

Power supply ~230V 1ph 50Hz

Power input (BS EN 14511 - air: 7°C / water: 35°C) kW 1.46 2.30 3.90

Mechanical protection IPX4

Compressor DC twin rotar y - inverter driven

Pressure (maximum) MPa 4.1

Refrigerant R410A

Mass of R410A kg 1.05 1.72 2.99

Circulating pump m head 10 6 12

Flow rate (minimum) litres/min 5 10 15

Outdoor temperature °C -20 to 43

Inlet water temperature °C 5 to 55

Water pressure (system) MPa (bar) 0.1 to 0.3 (1 to 3 bar)

Sound power level at 1 metre (external) dB(A) 63 67 63

Sound pressure level at 1 metre (external) dB(A) 40 44 40

Water connections BSPF ¾˝ 1˝ 1¼˝

Weight (empty) kg 53 75 121

Weight (full) kg 54 76.8 123

Water content litres 1.0 1.8 2.0

Heat pump casing volume m³ 0.19 0.27 0.48

ErP rating (low temperature: 35°C flow) - heating

A++

ErP rating (low temperature: 55°C flow) - heating

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

HPID6 11.2 16 C

HPID10 17.5 20 C

HPID16 25.3 32 C

2 Technical Data

Section 2: Technical Data Page 7

2.3 Heat Pump Dimensions

327

57

388 54

R3/4(20A)

30015.3 42

825 73

16 659

580

122.5 122.5

43

Return

Flow

86616

850 21

R1(25A)

R1(25A)

25 330 38

480173

155540155

7570

357

Return

Flow

680185

36

356

13 330 13

80 80

241000

1418

205590205

Flow

Return

R1 1/4(32A)

R1 1/4(32A)

Figure 2-5: HPID16 dimensions

Figure 2-4: HPID10 dimensions

Figure 2-3: HPID6 dimensions

Section 2: Technical DataPage 8

2.4 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 2-6: Remote controller dimensions

Section 3: Installation Information Page 9

3.2 Heating System Design Criteria

Before continuing with the installation of the Aerona³ heat pump,
please spend a few minutes confirming 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, 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 buffer be used?

• If yes, what is the capacity of the buffer?

• 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 fired boiler operates with a flow
of 70°C and a return of 50°C, i.e. with a DT of 20°C. A heat pump
operates with a flow 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 fired 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
flow/return temperatures are taken into account in the selection
of the type and size of the heat emitters used.

While underfloor heating is the preferred heat emitter, a combination
of underfloor heating and radiators, or radiators only, works just as
efficiently. It is necessar y, 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 flow temperature.

At all other values of outside air temperature and water flow
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 flow
temperature, and

• decrease with higher water flow temperatures and increase

with lower water flow 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 me eting
the heat load for the propert y below the minimum design air
temperatures.

3.2.2 Heat Emitter Sizing

For guidance on sizing heat emitters, e.g. radiators and/or underfloor
heating, refer to MCS Heat Emitter Guide (MCS 021).

3 Installation Information

3.1 Introduction

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.

NOTE

!

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 filled. 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

flammable gas leakage such as from LPG cylinder around the
heat pump. Leaked flammable gas around the heat pump may
cause a fire.

• If the leaked refrigerant is exposed to fire, poisonous gas may be

produced.

• Connect the heat pump with the flexible 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, fire and leakage of water.

• Never touch electrical components immediately after the power

supply has been turned of f as electrical shock may occur. After
turning off the power, always wait five 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 fire.

• Ensure the wiring lid is fitted 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.

Section 3: Installation InformationPage 10

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

• MCS Installer 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 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

3.4 Heat Pump Location

3.4.1 Selection of position

• Consider a place where the noise and the air discharged will not

affect neighbours.

• Consider a position protected from the wind.

• Consider an area that reflects the minimum spaces

recommended.

• Consider a place that does not obstruct the access to doors or

paths.

• The surfaces of the floor must be solid enough to suppor t 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.

• If the Aerona³ heat pump is to be installed within 1 mile of the

coast, avoid siting facing the sea.

• If the Aerona³ heat pump is to be installed within 15 miles of the

coast, the evaporator must be sprayed with AFC50 and this must
be repeated on each annual service.

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. Provide the indicated space to ensure good airflow.

3. Do not install the heat pump near a source of heat, steam, or
flammable gas.

4. During heating operation, condensate water flows from the heat
pump. Therefore, install the heat pump in a place where the
condensate water flow will not be obstructed.

5. Do not install the heat pump where strong wind blows directly
onto the heat pump or where it is very dusty.

6. Do not install the heat pump where people pass frequently.

7. 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 final 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 ma ximum efficiency 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

The heat pump should be installed on a flat trowelled finished
concrete base 150mm thick. This base should extend at least 150mm
beyond the heat pump on three sides.

To avoid bridging the DPC, leave a gap of at approximately 150mm
between the concrete base and the wall of the house.

The heat pump must be raised up from 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 flow in and out of the heat pump.

Refer to Table 3-1 and Figure 3-2.

Table 3-1: Clearances

Aspect Minimum clearance required (mm)

To p 300

Bottom Approximately 100*

Front 600

Rear 300

Left 100

Right 600

* Height of A/V mounts (product code: HPIDFOOT/KIT)

Section 3: Installation Information Page 11

3.5.3 Condense Disposal

The underside of the heat pump has a condensate outlet (refer to
Figure 3-3) 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 flows from the opening in the
bottom of the heat pump casing running to a suitable gulley or
soakaway.

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 hazard for anyone
walking near the heat pump.
The top of the concrete base must be either level with, or
above, the surrounding ground level.

!

WARNING

Condensate outlet

Figure 3-3: 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/KIT) and fix the
heat pump securely to the mounts.

003 revO mm

Over 600 mm

Over 100 mm

Over 300 mm

Over 600 mm

HPID10

003 revO mm

Over 600 mm

Over 100 mm

Over 300 mm

Over 600 mm

HPID16

003 revO mm

Over 600 mm

Over 100 mm

Over 300 mm

Over 600 mm

HPID6

Figure 3-2: Clearances

Section 3: Installation InformationPage 12

3.6 Installing the Heat Pump

3.6.1 Insulation

The complete water circuit, including all pipework, must be insulated
to prevent heat loss reducing the efficiency of the heat pump and also
to prevent damage due to frozen pipes.

3.6.2 Connecting the Heating System to the Heat Pump

• Water connections must be made in accordance with diagram 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 flushed 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 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.

3.6.3 System Connections

The system connections of the heat pump must be carried out using
the flexible hoses, valves and fittings supplied with the heat pump.

The hydraulic circuit must be completed following the
recommendations below:

1. It is important to install the isolation valves bet ween the heat
pump and the building.

2. The system must have drain cocks in the lowest points.

3. Air vents must be included at the highest points of the system.

4. A system pressure gauge must be installed upstream of the heat
pump.

5. All pipework must be adequately insulated and supported.

6. The presence of solid particles in the water can obstruct the
heat exchanger. Therefore, protect the heat exchanger using a
magnetic filter such as a Grant Mag-One.

7. After system assembly flush and clean the whole system, paying
particular attention to the state of the filter.

8. A new installation must be thoroughly flushed and cleaned before
filling and adding anti-freeze/biocide/inhibitor.

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.

!

WARNING

3.6.4 Remote Controller

For details on how to install the remote controller, refer to Section 7.

For setting, refer to Section 9.

3.7 Metering for Domestic RHI Installations

Some air source heat pump installations may require a heat meter to
be fitted under certain circumstances, for example:

• Where the property is occupied for less than 183 days per year

• If there is a back-up heating system installed

A heat meter must be installed and regular meter readings will have
to be submitted as the RHI payment will be determined from these
readings.

‘Meter Ready’ Installations

Currently, air source heat pump installations that are receiving a
domestic Renewable Heat Incentive (RHI) payment will not usually
require a heat meter to be fitted. The payment is based on the annual
heat demand, as stated on the EPC for the propert y.

However, even though a heat meter is not required for these
domestic installations to receive an RHI, they must be ‘meter ready’
in accordance with MCS requirements. Refer to the MCS Domestic
RHI Metering Guidance Document for full details.

3.8 Buffer Tanks

3.8.1 Buffer Tanks

A buffer tank is NOT required for the Grant Aerona³ HPID6 (6kW) and
HPID10 (10kW) heat pumps.

A buffer tank will be required for the Grant Aerona³ HPID16 (16kW)
heat pump where:

• The overall system volume is less than 100litres
OR

• If the part of the system connected to the heat pump is less than
30 litres during the normal operation of the system

For example:

• When the heating zone valves(s) are closed leaving only the
primary circuit to a cylinder connected to the heat pump

• When the hot water zone valve is closed leaving a heating zone
(or zones) connected to the heat pump

The buffer tank must be large enough to ensure that the volume of
that part of the system will be at least 30 litres.

This buffer tank is simply a vessel required to increase the volume of
the system, to meet the requirements given above. It must be fitted in
the return to the heat pump. Refer to Figure 3-4.

Buffer tanks suitable for this purpose are available. For further
information, please contact Grant UK on [phone].

A buffer tank temperature probe is NOT required as this is not
a thermal store.

NOTE

!

Section 3: Installation Information Page 13

3.9 Hydraulic Diagrams

3.9.1 S-plan type with Buffer (optional)

2

1

2 3

4

5 6

7

8

9

15

Static head of system

10

11

10

11

13

14

12

Figure 3-4: Monovalent system - with optional buffer and S-Plan type controls

The above system diagram is only a concept drawing, not a detailed engineering drawing, and is not intended to describe
complete systems, nor any particular system.

It is the responsibilit y of the system designer, not Grant UK, to determine the necessary components for and configuration of the
particular system being designed including any additional equipment and safety devices to ensure compliance with building and
safety code requirements.

Table 3-5: Key

Key Description

1 Expansion vessel

2 Pressure gauge

3 Pressure relief valve

4 Tundish

5 Removable filling loop

6 Double check valve

7 Automatic air vent

8 Thermostatic radiator valve

9 Automatic bypass

10 Flexible hose

11 Isolation valve

12 Buffer (optional)

13 Motorised 2-port valves

14

Optional additional circulating pump

(refer to Section 8.3.7)

15 Drain point

Optional

Section 3: Installation InformationPage 14

3.10 Before you Commission

3.10.1 Flushing and Corrosion Protection

To avoid the danger of dir t and foreign matter entering the heat pump
the complete heating system should be thoroughly flushed 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 first flushed 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 flushed in accordance with the
guidelines given in BS 7593:2006 ‘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 flushing, a suitable thermal fluid should be used (such as
Sentinel R600) specifically 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 ex ternal section of
the heating system (i.e. the flexible 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, a suitable Biocide (such as Sentinel R700) should also
be used in conjunction with the thermal fluid.

Both the thermal fluid and biocide should be added to the system
water when finally filling the heating system.

Alternatively, Fernox HP5C can be used (or HP15C for greater frost
protection).

This is a suitable thermal fluid that already contains a suitable
biocide.

Full instructions on the correct use of thermal fluids and biocides are
supplied with the products, but further information can be obtained
from either ww w.sentinel-solutions.net or ww w.fernox.com.

Failure to implement the above guidelines by fully flushing the system
and using a suitable thermal fluid and biocide corrosion inhibitor will
invalidate the heat pump product guarantee.

Grant Engineering (UK) Limited strongly recommends that a
Grant MagOne in-line magnetic filter/s (or equivalent*) is fitted
in the heating system pipework. This should be installed and
regularly serviced in accordance with the filter manufacturer’s
instructions.

* As measured by gauss. The MagOne magnetic filter has a gauss
measurement of 12000.

3.10.2 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.

Table 3-6: Antifreeze concentration

% Monoethylene glycol inhibitor 10% 20% 30% 40%

Freezing temperature* -4°C -9°C -15°C -23°C

Correction

factor

Capacity 0,996 0,991 0,983 0,974

Power absorbed 0,990 0,978 0,964 1,008

Pressure drop 1,003 1,010 1,020 1,033
* The temperature values are indicative. Always refer to the temperatures given for the specified product used.
For details of how to access the parameter settings, refer to Section 9.3.

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 Table 3-6 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 3-7.

• Replace the wiring cover and secure in place with the screws

provided.

Terminal PCB

ON

1

OFF

DIP SW. position

2 345

6 7 8

Figure 3-7: Anti-freeze function setting

Dip switch positions:
Up: ON
Down: OFF
Refer to Sections 8.4.1, 8.4.2 and 8.4.3.

NOTE

!

Even with DIP SW1 set to OFF, to prevent the circulating pump
operating for frost protection it will also be necessary to r eset
four of the factory set frost protection contr ol parameters to
the ‘disabled’ setting. Refer to Table 3-8.

NOTE

!

To do this, use the remote controller as follows (refer to Section 9.1
page 46):

First access the Installer level:

1. Press and hold the ‘Menu’ (3) and the ‘-‘ and ‘+’ (6) 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 first two digits of the parameter
number will be blinking.

Then, access the Service level:

1. Use the ‘Up’ and ‘Down’ (8) buttons to change these first two
digits to 99 and then press the ‘+’ button.

Section 3: Installation Information Page 15

3.12 Installation Checklist

Location and positioning

• The vibration damping feet/shoes are fitted (if supplied)

• The heat pump is fixed 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 filter 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

• The low-loss header or buffer tank is installed if the water content

is insufficient (16kW unit only - refer to Section 3.8)

• The water circuit has been thoroughly flushed

• 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 off valves are installed on the inlet/outlet of system

circuit

• The drain valves are installed at the lowest points in the system

• The flexible hoses are installed on the inlet/outlet of system circuit

• The system water content complies with the specification in the

manual

• The DHW immersion heater has been installed in DHW tank for

Legionella prevention

• Suitable water flow rate for operation of the entire heat pump is

achieved as specified 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-off devices protruding from the insulation

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 specified in the manual

• The earth wires are connected securely

2. The second two digits will then blink. Use the ‘Up’ and ‘Down’
buttons to change these two digits to 99 and then press the ‘+’
(6) button.

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 first 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’
(8) button.

3. Press the ‘+’ (6) button and the second two digits (the
parameter code) will blink.

4. Set the parameter code number to 00 using the ‘Up’ or ‘Down’
(8) button.

5. Press ‘Set’ (7) button and 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’ (8) button.

Repeat this process to reset the values of parameters 4310, 4320
and 4330 to 0.

Return to normal operation:

Press and hold the ‘Menu’ (3) and the ‘-‘ and ‘+’ (6) buttons together
for 3 seconds or simply leave the remote controller for 10 minutes.

Do NOT disable the heat pump antifre eze function unless a
suitable concentration of glycol is present in the system water.
Refer to Table 3-6. 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.

NOTE

!

3.11 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.

Ensure that these installation and servicing instructions and the user
instructions are handed over to the householder.

Table 3-8: 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 -

Section 4: Sealed SystemPage 16

4.1 Sealed System Requirements

2

1

2 3

4

5 6

7

8

9

15

Static head of system

10

11

10

11

13

14

12

Figure 4-1: Sealed System heating components

4 Sealed Systems

Table 4-2: Sealed System heating components key

Key Description

1 Expansion vessel

2 Pressure gauge

3 Pressure relief valve

4 Tundish

5 Removable filling loop

6 Double check valve

7 Automatic air vent

8 Thermostatic radiator valve

9 Automatic bypass

10 Flexible hose

11 Isolation valve

12 Buffer (optional)

13 Motorised 2-port valves

14

Optional additional circulating pump

(refer to Section 8.3.7)

15 Drain point

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 filling the system

Expansion vessel

The expansion vessel can be fitted in either the return or flow
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 flexible hose, care must be taken
to ensure that the hose is not twisted.

Ensure that the expansion vessel used is of suf ficient size for
the system volume.
Refer to BS 7074:1:1989 or The Domestic Heating Design
Guide for sizing the required vessel.

NOTE

!

Optional

Section 4: Sealed System Page 17

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 filling loop for the
system.

Safety Valve

The safety valve (provided with the heat pump) is set to operate at 3
bar. It should be fitted in the flow 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 propert y.

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 filling loop arrangement incorporating a double
check valve assembly.
The filling loop must be isolated and disconnected af ter filling the
system.

Heating System

The maximum ‘setpoint’ temperature for the central heating water is
55°C.

An automatic air vent should be fitted to the highest point of the
system.

If thermostatic radiator valves are fitted to all radiators, a system
by-pass must be fitted. The by-pass must be an automatic type and
correctly set when the system is commissioned.

All fittings 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.

Only ever fill or add water to the system when it is cold and the
heat pump is off. Do not overfill.

!

WARNING

The procedure for filling the sealed system is as follows:

1. Check the air charge pressure in the expansion vessel BEFORE
filling 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 filling is completed and then it is closed.

3. Remove the top (6kW) and front right (10kW and 16kW) casing
and loosen the plug on the automatic air vent located inside the
heat pump. Refer to Figure 4-3.

loosen

tighten

Auto air vent

Plug

Figure 4-3: Auto Air Vent

4. Ensure that the flexible filling loop is connected and that the
double check shut off 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 fill point valve.

6. Gradually open the double check valve from the water supply
until water is heard to flow.

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 fill the system until the pressure gauge indicates
between 0.5 and 1.0 bar. Close the fill point valve. The system fill
pressure (cold) should be 0.2 - 0.3 bar greater than the vessel
charge pressure – giving typical system fill 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 fill point and double check valves either side of the
filling loop and disconnect the loop.

13. Check the system for water soundness, rectifying where
necessary.

The air charge pressure may be checked using a t yre
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.

NOTE

!

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 off 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.

The expansion vessel air pressure, system pressure and
operation of the pressure relief valve must be checked on
each service. Refer to Section 10.

NOTE

!

Section 5: Domestic Hot WaterPage 18

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 flow temperature
will target 60°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 but you may want to increase or decrease this
time period. 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 flow 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 flow temperature to
the space heating circuit.

If the motorised valve for space heating is open during DHW demand,
the 60°C flow 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 11 DHW comfort set temperature 50.0 40.0 60.0 0.5°C

I 31 21 Ma ximum 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 Heat Pump 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 efficiently.

Grant UK has developed a 200 litre high-efficiency cylinder (Band A)
for use with a combination heat pump. Other Band B and C cylinders
are available but consideration should be given to system efficiency.

In order to ensure that a minimum of at least 8K temperature
difference is maintained between cylinder flow and return, the correct
Grant UK heat pump 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 differential.

Section 5: Domestic Hot Water Page 19

5.3 Legionella

It is possible to use the heat pump to raise the HW cylinder to around
50 to 55°C.

For protection against Legionella the temperature can be periodically
raised to 60°C using the Grant Automatic DHW Boost Kit 2, available
from Grant UK (product code: HPDHWBK2).

This boost kit also allows the cylinder immersion element to be used
to raise the temperature to 60°C for one hour either daily or weekly to
sterilise the cylinder against Legionella.

For this system to operate, the existing immersion switch must
be left set permanently to ON.

To totally prevent operation of the immersion element, the
existing immersion switch must be set to OFF.

NOTE

!

5.3.1 Legionella Sanitisation Regime

Care must be given to vulnerable people who may be exposed to
potentially life-threatening legionella. This group of people include
the elderly, pregnant women, young children and those with breathing
difficulties.

Care must also be given to households who do not use a lot of water
on a daily basis. While this chart is not exhaustive, it is impor tant that
you discuss any potential issues with the occupants before deciding
on the appropriate regime. It is important that this decision is based
on the welfare of the occupants and not on energy saving measures.

Table 5-2: Legionella group sanitisation regime

Uses less than 50
litres of hot water

per day

Uses more than 50

litres of hot water

per day

Vulnerable Group

Store at 50°C and raise

hot water cylinder to

60°C for 1 hour every

day

Store at 50°C and raise

hot water cylinder to

60°C for 1 hour every

3 days

Non-Vulnerable Group

Store at 50°C and raise

hot water cylinder to

60°C for 1 hour every

week

Store at 50°C and raise

hot water cylinder to

60°C for 1 hour every

2 weeks

If the hot water stored in the cylinder has not been used for a
prolonged period of time (e.g. a few days) and has not been
stored at 60°C, then it is impor tant that the temperature is
raised to at least 60°C for a period of one hour before using the
hot water.

!

WARNING

5.4 Automatic DHW Boost Kit

This system uses both the existing cylinder immersion heater and
cylinder thermostat. This is switched via a contactor operated by a
small timeswitch, both enclosed in a separate unit to be mounted next
to the cylinder. Thus the immersion element can be programmed to
operate for the required period on either a daily or weekly basis.

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
off, via the immersion heater switch, irrespective of the programmer or
cylinder thermostat setting or whether the heat pump is operating.

5.4.1 Installation

The Automatic DHW Boost Kit 2 comes pre-wired within its enclosure,
ready for installation. The connections to the Immersion heater switch,
Immersion heater and cylinder thermostat must be made after it is
installed on site.

When installed, this kit interrupts the electrical supply between the
existing immersion heater switch and immersion heater. Refer to
Figure 5-4 for electrical connection details.

In order to connect and use this kit the existing cylinder thermostat
must have two output terminals; one ‘make on rise’ (normally open)
contact and the other ‘break on rise’(normally closed) contact. If not,
then the cylinder thermostat MUST be replaced with one that does
have two output terminals.

The use of any other type of cylinder thermostat, or any modification
to an existing thermostat, will invalidate the product guarantee and
may result in a potentially dangerous installation.

IMPORTANT
Do not alter the pre-wired connections within the enclosure
and only make the external connections as shown in the wiring
diagrams. See Figure 5-4.

Where a 3-phase supply is present, ensure that BOTH the
immersion switch and heating system controls are taken from
the same phase. If in doubt, contact a qualified electrician.

!

WARNING

Section 5: Domestic Hot WaterPage 20

5.4.2 Setting

To set the timeswitch use the following procedure:

To set the time and day:

1. Press and hold down the ‘clock’ button throughout the ‘time and
day’ setting process.

2. Press ‘h+’ button repeatedly to set hour (24 hour clock).

3. Press ‘m+’ button repeatedly to set minutes.

4.

If you hold down either the ‘h+’ or ‘m+’ buttons for longer than
a second the figures in the display will scroll continuously.

NOTE

!

Press the ‘day’ button repeatedly to scroll through to required day
of week.

5. Release the ‘clock’ button. The clock is now running as indicated
by the flashing colon.

To set switching times:

You can set up to six ON and OFF commands per day, if required, as
follows:

1. Press the ‘timer’ button. The actual time will disappear from the
display. The first ‘ON’ indication will be displayed.

2. Press ‘h+’ button repeatedly to set hour (24 hour clock).

3. Press ‘m+’ button repeatedly to set minutes.

4. Press the ‘day’ button repeatedly to scroll through day options –
each single day, all weekdays, weekend and entire week.

5. Press the ‘timer’ button again. The first ‘OFF’ indication will be
displayed.

6. Repeat steps 2 to 4 (above) to set first OFF time – hours minutes
and day.

7.

Ensure that day (or days) for the OFF set ting match those for
the ON setting.

NOTE

!

Press the ‘timer’ button again. The second ‘ON’ indication will be
displayed.

8. Repeat the above procedure to set second ON and OFF times,
if required.

9. After setting all required ON and OFF times – press the ‘clock’
button to return to current time display.

To check ON/OFF settings

Repeatedly press the ‘timer’ button to scroll through all ON and OFF
settings.

To change an ON or OFF setting

When a setting is showing on the display – press the ‘h+’ ‘m+’ or
‘day’ buttons to alter the setting as required.

To delete an ON/OFF setting period

1. Press the ‘timer’ button until the ‘ON’ setting for the period to be
deleted is displayed.

2. Press the ‘h+’ button repeatedly until ‘- -‘ appears (after 23
hours).

3. Press the ‘m+’ button repeatedly until ‘- -‘ appears (after 59
minutes).

4. Press the ‘timer’ button and the ‘OFF’ setting for the period to be
deleted is displayed.

5. Repeat steps 2 and 3 (above) to delete the ‘OFF’ setting.

6. Press the ‘timer’ button to save the amended command.

7. The deleted ON/OFF period is now available for re-programming
if required.

8. Press the ‘clock’ button to return to the current time display.

To override the timeswitch

If timeswitch is ON - press the ‘override’ button to set timeswitch to
OFF.

If timeswitch is OFF – press the ‘override’ button to set timeswitch to
ON.

The hot water controls must be ‘calling’ for this switch to bring
the immersion on.

NOTE

!

Operation

With the Automatic DHW Boost Kit 2 fitted, the HW cylinder thermostat
should be set to between 50 and 55°C for optimum operation. When
the heat pump raises the cylinder to this temperature the cylinder
thermostat will be ‘satisfied’ and switch to the ‘make on rise’ or
‘normally open’ connection.

The HW zone valve, being no longer fed from the cylinder thermostat,
will close.

The resulting switched live from the normally open contact of the
cylinder thermostat supplies power to terminal 3 on the Boost Kit
timeswitch. See Figure 5-4.

When the timeswitch contact closes, at the pre-set time, the output
from terminal 4 of the timeswitch energises the contactor coil, closing
the contactor contacts and connecting the output from the Immersion
heater switch to the immersion heater.

If, whilst the immersion heater is in operation, hot water is drawn
off and the temperature in the cylinder falls to below the cylinder
thermostat setting, the cylinder thermostat will operate and interrupt
the power supply to the Boost kit and the immersion heater will stop
operating.

In this case the heat pump will receive a HW demand to operate, to
heat the HW cylinder.

If the amount of hot water drawn off is small, the temperature drop
in the cylinder may be minimal and the cylinder thermostat may not
detect it.

In this case the cylinder thermostat will continue to supply power to
the Boost kit. The Immersion heater will continue to operate and no
HW demand will be sent to the heat pump.

IMPORTANT
There must be a demand from the HW channel of the heating/hot
water programmer for the Automatic DHW Boost Kit 2 to operate
when required. When setting the ON periods on the Auto Boost
Kit timeswitch, ensure that they are within a HW ON period on the
programmer.

Two separate power supplies are connected within the HW
boost kit enclosure – one from the immersion heater switch
and the other from the heating controls circuit. Ensure that
BOTH supplies are isolated before commencing any work on
the boost kit relay or switch.

A warning label informing the user of this has been fixed on the
enclosure.

THIS LABEL MUST NOT BE REMOVED FROM THE
ENCLOSURE.

!

WARNING

Section 5: Domestic Hot Water Page 21

Figure 5-4: Boost kit wiring diagram

1

A1

Cylinder

Stat

1 2

C

2234 3 4

1

A2

Immersion

Heater Switch

Immersion

Heater

HW Controls

To HW Valve

E
N

L

E

N

L

Red

Earth connections have been excluded for

clarity. Ensure all earth connections ar e made

prior to energising.

The HW boost pack contains a power relay and

an additional 2-pole isolator and programmable

timer.

NOTE

!

Figure 5-3: Boost kit timeswitch

Day h+

Timer M+

R

MO

TU

WE

TH
FR
SA
SU

TIMER

OFF ON

LCD display

Day button

Timer button

Clock button

Hours adjust button

Minutes adjust button

Override button

Section 6: ElectricalPage 22

6 Electrical

6.1 Wiring Centre

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
responsibilit y of the installer.

!

WARNING

All wiring connections are made to the Terminal PCB (refer to Figure
6-1) and terminal block (refer to Figure 6-3) inside the heat pump.

To access these connections, remove the wiring cover at the right
hand end of the heat pump.

Terminal block

Cable clamp

ON

Reset

SW.

Pump

SW.

OFF

Terminal
PCB

3

4

2

1

Remote

Controller

1

2

3

4

5

6

7

17

18

19

20

21

22

23

Humidity
Sensor

COM
DHW Remote

Contact
ON/OFF

or
EHS Alarm

GND

24VAC

COM

Control

DHW

T.probe

OUTDOOR
T.probe

BUFFER

T.probe

Mix water

T.probe

3-way
mixing
valve

RS485

+

-

Dehumidifier

Alarm

Pump1

Pump2

Neutral

N.C.

Neutral

EHS

Heating
Cooling

mode

output

Phase

Signal

3-way
valve

8

9

10

11

12

13

14

Dual Set
Point
Control

Heating
Cooling
mode

Flow
switch

Night
mode

Low
tariff

RS485
GND

45

46

47

48

49

50

31

32

24

25

26

27

28

29

30

15

16

N

41

42

43

44

51

52

Electric
heater

Figure 6-1: Terminal PCB

Section 6: Electrical Page 23

6.2 Terminal PCB Input/Output

Serial connections

Terminal Function Analogue Input Digital Input

1 - 2 - 3 Remote controller 1=S1, 2=S2, 3=GND

Wire length is

maximum 100m with

1mm² shielded cables

Analogue/Digital INPUTS
Table 6-2: Terminal PCB input/outputs

Terminal Function Analogue Input Digital Input

19 - 18 DHW remote contact

Voltage free contact

12V10mA

20 - 21 Configurable input -ON/OFF remote contact

28 - 29* Night mode - optional

30 - 31* Low tarif f - optional

* Requires external timer
For details of how to access the parameter settings, refer to Section 9.3.

Terminal block

Cable clamp

Connection diagram

Unit side terminal

Power supply

Earth

N

)L( )N(

1 2 3

Earth wire

Power supply cord

)L( )N(

POWER

N

Do Not Use

Do Not Use

L

Figure 6-3: Power supply

6.3 Power Supply

Use a dedicated power supply with a correctly sized circuit breaker.

The final power supply connection must be made from a weatherproof
lockable isolator located outside the building.

The cable should be either armoured or run in a flexible conduit
between the isolator and heat pump.

Section 6: ElectricalPage 24

Cable and circuit breakers should be to EN Standards.

NOTE

!

Table 6-5: Power supply cable and breaker capacity

Model

Power supply cable (mm²)

Breaker

capacity

Maximum Minimum

HPID6 2.5 1.5 16A Class C

HPID10 4.0 2.5 20A Class C

HPID16 6.0 4.0 32A Class C

In the case of long cable runs, selection of correct cable must
be done in accordance with BS 7671 (IET Wiring Regulations)

NOTE

!

Strip ends of connecting cables in accordance with Figure 6-6.

Crimp terminals with insulating sleeves can be used if required
as illustrated in the diagram below for connecting the wires to the
terminal block. Stranded conductors shall not be soldered.

• Use a circuit breaker with a 3 mm clearance of air gap between
the contacts.

• Be sure to FULLY inser t the cable cores into the proper position

of the terminal block.

• Faulty wiring may cause not only abnormal operation but also

damage to PCB board.

• Fasten each terminal screw securely.

• To check the connections are secure, pull the cable slightly.

10 mm 30 mm

Terminal block

Crimp terminal

Stripped wire :10mm

Sleeve

Crimp terminal

Sleeve

PCB(Terminal)

Figure 6-6: Stripping the cables

It is important that the cable is stripped back 10mm.
If shorter, it is possible to clamp down onto the insulation.
If longer, a short circuit may occur.

!

CAUTION

Lockable
isolator

Consumer

unit

Figure 6-4: Heat pump, isolator and consumer unit