Grant UK Aerona3 Installation And Servicing Instructions DOC 0109 Rev 1.1 May 2016

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Grant UK Aerona³
Air to Water High Efficiency Heat Pump Range
Installation and Servicing Instructions

UK | DOC 0109 | Rev 1.1 | May 2016

Special Tex t Formats
The following special text formats are used in this manual 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 tex t but of importance to the reader.

GRANT ENGINEERING (UK) LIMITED
Hopton House, Hopton Industrial Estate, Devizes, Wiltshire, SN10 2EU
Tel: +44 (0)1380 736920 Fax: +44 (0)1380 736991
Email: info@grantuk.com 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This manual is accurate at the date of printing but will be superseded and should be disregarded if specifications and/or appearances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 2016. No part of this manual may be reproduced by any means without prior written consent.

Contents
1

Introduction

1.1
1.2
1.3
1.4
1.5
1.6
1.6
1.7
1.8
1.9

Technical Data

1.1
2.2
2.3
2.4

Heat Pump Technical Data
Main Supply Cable
Heat Pump Dimensions
Remote Controller Dimensions

Installation Information

3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
3.10
3.11
3.12

Introduction
Heating System Design Criteria
Regulations
Heat Pump Location
Preparation for Installation
Installing the Heat Pump
Weather Compensation
Buffer Tanks
Hydraulic Diagrams
Before you Commission
Completion
Installation Checklist

Sealed Systems

4.1
4.2
4.3

General
Outputs
Main Components
Planning Permission
DNO Application
Servicing
Important Advice
Product Contents
Installation Accessories
Heat Pump Components

Sealed System Requirements
Filling the Sealed System
Pressure Relief (Safety)
Valve Operation

Domestic Hot Water

5.1
5.2
5.3
5.4

Temperature Control
Heat Pump Cylinders
Legionella
Automatic DHW Boost Kit

Electrical

6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
6.9

Wiring Centre
Terminal PCB Input/Output
Power Supply
Tightening Torques
Solar Thermal
Connection of Heating System Controls
Connection of Remote Controller
Wiring Diagrams
System Control Wiring Diagrams

Remote Controller

7.1
7.2
7.3
7.4

7.5
7.6

Remote Controller
Installation Requirements
Installing the Remote Controller
Connecting the Remote Controller
to the Heat Pump
Buttons
Display Panel

4
4
4
4
4
4
4
4
4
5

6
6
7
8

9
9
10
10
10
12
13
14
15
16
17
17

18
19
19

20
20
21
21

24
25
25
27
27
27
27
28
30

32
32
32
33
34
35

Operation

8.1
8.2
8.3
8.4

8.5
8.6
8.7

Heat Pump Operation
Water Pump Management
Frost Protection
ON/OFF DHW Production Remote
Contact
ON/OFF Heating Remote Contact
Night Mode
Low Tariff

Commissioning

9.1
9.2
9.3
9.4

9.5

9.6
9.7

9.8
9.9

System Setup
Setting the Day and Time
Access for Parameter Settings
Accessing the Parameter Setting Menu
(User level)
Accessing the Parameter Setting Menu
(Installer level)
Parameters Input/Output
Remote Controller Back Light Display
Parameters
Anti-freeze Function Setting
Pump Operation and Air Bleeding
from Heating System

36
37
40
42
43
44
45

46
46
47
47
47
48
48
49
49

10 Servicing

11 Fault Finding

10.1
10.2
10.3
10.4
10.5
10.6
10.7

11.1
11.2
11.3
11.4
11.5

11.6

General
Air Inlet and Outlet
Condensate Disposal
Heating System Connections
Heat Pump Controls
Refrigerant
Monitor Display Function

Error Code Display
Error History Display
Reset Error Code Display
Error Codes
Table of Controller PCB and Terminal
PCB Alarms
Error Codes and PCB Alarm Figures
and Tables

50
50
50
50
50
50
51

52
52
52
53
56
57

12 Spare Parts

13 Declaration of Conformity

14 Health and Safety Information

12.1
12.2
12.3
12.4
12.5
12.6

Exploded Diagram - HPID6
Spare Parts List - HPID6
Exploded Diagram - HPID10
Spare Parts List - HPID10
Exploded Diagram - HPID16
Spare Parts List - HPID16

14.1 General
14.2 Refrigerant

60
61
62
63
64
65

67
67

15 Disposal and Recycling

16 Guarantee

Appendix A
Contents

70
Page 3

1 Introduction
1.1 General

limits and conditions listed on the Planning Portal website are met.

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

For further information, visit w w w.planningportal.gov.uk.

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

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.

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 lef t with the householder for future
reference.

1.2 Outputs

1.5 DNO Application

The necessary information required to make this application (J-forms)
can be downloaded from the Grant UK website (w w 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.

There are three models in the Aerona³ range as follows:
Product code

Output*

HPID6

6kW

HPID10

10kW

HPID16

16kW

1.7 Important Advice
1.

* 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-efficiency 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-efficiency 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-efficiency DC pump speed controlled from the ASHP
control PCB.
• Anti-freezing heater
Factory fitted electric heater prevents condensate in the base of
the heat pump from freezing.
• Pressure Relief Valve
A 3 bar pressure relief valve is factory fitted.
• Air Purge Valve (Automatic Air Vent)
Factory 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 UK Aerona³ heat pump on domestic
premises may be considered to be permitted development, not
needing an application for planning permission, provided ALL the

Page 4

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.
The heat pump must be installed and commissioned in
accordance with these user, 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.
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.
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
• HPID6: 22mm, HPID10: 28mm, HPID16: 35mm
• 2 x Isolating valves
• HPID6: 22mm, HPID10: 28mm, HPID16: 35mm
• 1 x Remote Controller
• 1 x Remote Controller cable (length: 8 metres)
• 1 x Installation, User and Servicing Instructions

1.9 Installation Accessories
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)

Section 1: Introduction

1.9 Heat Pump Components

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

Pressure relief valve
Auto-air vent
Terminal PCB

Main PCB

Terminal block
Compressor
Pump

Wiring cover
Air outlet

Screw

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

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

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

Auto-air vent

Terminal PCB

Main PCB

Terminal block

Wiring cover

Pressure relief valve

Compressor
Pump

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

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

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

Main PCB
Terminal PCB
Terminal block

Wiring cover

Pressure relief valve
Auto-air vent
Compressor

Screw

Pump

Air outlet

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

Section 1: Introduction

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

Page 5

2 Technical Data
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)

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

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

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

Power supply

230V 1ph 50Hz

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

1.46

Mechanical protection

2.30

3.90

IPX4

Compressor

DC twin rotary - inverter driven

Pressure (ma ximum)

MPa

4.1

Refrigerant

R410A

Mass of R410A

1.05

1.72

2.99

Circulating pump

m head

Flow rate (minimum)

litres/min

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)

Sound pressure level at 1 metre (external)

dB(A)

Water connections

BSPF

¾˝

1˝

1¼˝

121

Weight (empty)
Weight (full)
Water content
Heat pump casing volume
ErP rating (low temperature: 35°C flow) - heating

76.8

123

litres

1.0

1.8

2.0

m³

0.19

0.27

0.48

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
MCB

Maximum
running current
(A)

Rating (A)

Type

HPID6

11.2

HPID10

17.5

HPID16

25.3

Heat pump
model

Page 6

Section 2: Technical Data

2.3 Heat Pump Dimensions
43
327

Circulating water
return port

825

15.3

300

388

659

R3/4(20A)

580

122.5

Circulating water
flow port

Figure 2-3: HPID6 dimensions

357

75 70

155

Circulating water
flow port

540

155

850

330

480

R1(25A)

173

866

R1(25A)

Circulating water
return port

Figure 2-4: HPID10 dimensions
80

Circulating water
flow port

36
330
13

356

1000

680

1418

R1 1/4(32A)

185

R1 1/4(32A)

Circulating water
return port

205

590

205

Figure 2-5: HPID16 dimensions

Section 2: Technical Data

Page 7

2.4 Remote Controller Dimensions
Mounting plate

Door closed

Door open

16.5

(116)

120

18.25

83.5

18.25

6-4.2×7

Knock out hole

Figure 2-6: Remote controller dimensions

Page 8

Section 2: Technical Data

3 Installation Information
3.1 Introduction

3.2 Heating System Design Criteria

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 UK 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 off 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.

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 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 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 meeting
the heat load for the property below the minimum design air
temperatures.
3.2.2 Heat Emit ter Sizing
For guidance on sizing heat emitters, e.g. radiators and/or underfloor
heating, refer to MCS Heat Emitter Guide (MCS 021).

Section 3: Installation Information

Page 9

3.3 Regulations

3.5 Preparation for Installation

Installation of a Grant UK 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)

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.

The installation should also be in accordance with the latest edition of
the following standards and codes of Practice:
•
BS 7671:2008 and Amendments
•
BS EN 12831:2003

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 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.

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)

Top

300

Bottom

Approximately 100*

Front

600

Rear

300

Left

100

Right

600

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

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
UK 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.

Page 10

Section 3: Installation Information

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.

Ov
er 1

Over 300 mm

HPID6

Provision must be made to safely collect and dispose of the
condensate.
For example, use 1½ 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.

00
er 3

0
r 60

e
Ov

Ov
er 6

Ov
er 1

Over 300 mm

HPID10

00
er 3

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.

Ov
er 6

er
Ov

WARNING

m
600

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.

Ov
er 1

Over 300 mm

HPID16

3
ver

0
er 6
Ov

Ov
er 6

Figure 3-2: Clearances

Section 3: Installation Information

Page 11

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 ma ximum 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 between 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 UK MagOne.
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.

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.

NOTE

The hydraulic diagrams do not show the isolation valves, any
expansion vessels, pressure relief valves or filling loops.
More information on these components can be found in Section
3.10
3.6.4 Remote Controller
For details on how to install the remote controller, refer to Section 7.
For setting, refer to Section 9.

Page 12

Section 3: Installation Information

3.7 Weather Compensation
3.7.1 Water Temperature Control Point
The water temperature control point is based on a variable set point
calculated automatically using climatic (weather compensation)
curves as described below.
3.7.2 Heating Climatic Curves
The regulation of the temperature of the outlet water from the heat
pump, in normal winter heating operation, is based on the climatic
curves.
The basic logic is to modulate the temperature of the outlet water
depending on the outdoor air temperature.

Outgoing water
set point
Tm1(45.0°C)

Tm2(30.0°C)

Te1(0.0°C)

Te2(20.0°C)

Outdoor air temperature

Figure 3-4: Climatic curves
Table 3-5: Weather compensation parameters
Level

Parameter
Group

Code

Function description

Display and input value
Default

Min.

Max.

Unit

Ma ximum outgoing water temperature in Heating mode (Tm1)

45.0

23.0

60.0

0.5°C

Minimum outgoing water temperature in Heating mode (Tm2)

30.0

23.0

60.0

0.5°C

Minimum outdoor air temperature corresponding to ma ximum
outgoing water temperature (Te1)

-4

-20.0

50.0

0.5°C

Ma ximum outdoor air temperature corresponding to ma ximum
outgoing water temperature (Te2)

20.0

0.0

40.0

0.5°C

Hysteresis of water set point in heating

8.0

0.5

10.0

0.5°C

Remarks

For details of how to access the parameter settings, refer to Section 9.3.

Section 3: Installation Information

Page 13

3.8 Buf fer Tanks
3.8.1 Buf fer Tanks
If there is insufficient volume of water (<100 litres) in the system a
buffer tank may be required to reduce inefficient heat pump cycling.
This will simply be a vessel to increase the volume of the system.
Buffer tanks are available for this purpose. For further information,
please contact Grant UK on +44 (0)1380 736920.

NOTE

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

Page 14

Section 3: Installation Information

3.9 Hydraulic Diagrams
3.9.1 S-plan type with Buf fer (optional)

Static head of system

9
14
10 11

10 11

5 6

Figure 3-6: 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 responsibility 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 3-7: Key
Key

Description

Expansion vessel

Pressure gauge

Pressure relief valve

Tundish

Removable filling loop

Double check valve

Automatic air vent

Thermostatic radiator valve

Automatic bypass

Flexible hose

Isolation valve

Buffer (optional)

Motorised 2-port valves

Additional circulating pump
(refer to Section 8.2.6)

Drain point

Section 3: Installation Information

Page 15

3.10 Before you Commission
3.10.1 Flushing and Corrosion Protection
To avoid the danger of dirt and foreign matter entering the heat pump
the complete heating system should be thoroughly 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.

3.10.3 Anti-freeze function set ting
This function is factory set to ON - DIP SW1 is set to ON.
This function is not required if ethylene glycol is used in the heating
system to prevent freezing.
To disable the anti-freeze function, remove the wiring lid to access the
PCB Terminal and set DIP SW1 to OFF.

Terminal PCB

DIP SW. position

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’.

ON 1 2 3 4 5 6 7 8
OFF

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 external 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 grow th, 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.

Figure 3-8: Anti-freeze function setting

NOTE

Dip switch positions:
Up:
ON
Down: OFF

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 w w w.sentinel-solutions.net or w w 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 Antifreeze concentration in the system
Refer to Table 3.11.

Table 3-11: Antifreeze concentration

Correction
factor

% Monoethylene glycol inhibitor

10%

20%

30%

40%

Freezing temperature*

-4°C

-9°C

-15°C

-23°C

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.

Page 16

Section 3: Installation Information

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, and return the other copy to Grant UK.
Ensure that these Instructions are handed over to the householder.

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
• 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 the manual
• 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

Section 3: Installation Information

Page 17

4 Sealed Systems
4.1 Sealed System Requirements

Static head of system

9
14
10 11

Figure 4-1: Sealed System heating components

Table 4-2: Sealed System heating components key

Page 18

10 11

Key

Description

Expansion vessel

Pressure gauge

Pressure relief valve

Tundish

Removable filling loop

Double check valve

Automatic air vent

Thermostatic radiator valve

Automatic bypass

Flexible hose

Isolation valve

Buffer (optional)

Motorised 2-port valves

Additional circulating pump
(refer to Section 8.2.6)

Drain point

5 6

All Grant Aerona³ heat pumps must be used with sealed systems
complying with the requirements of BS EN 12828:2003, BS EN
12831:2003 ad BS EN 14336:2004.
The system must be provided with the following items:
•
Diaphragm expansion vessel complying with BS EN 13831:2007
•
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.

NOTE

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.

Section 4: Sealed System

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.

The procedure for filling the sealed system is as follows:
1.

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).

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 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 filling loop arrangement incorporating a double
check valve assembly.
The filling loop must be isolated and disconnected after filling the
system.
Heating System
The ma ximum ‘setpoint’ temperature for the central heating water is
55°C.
An automatic air vent should be fitted to the highest point of the
system.

Auto air vent
Plug
loosen
tighten

Check the air charge pressure in the expansion vessel BEFORE
filling the system.

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.

Remove the front casing and loosen the plug on the automatic
air vent located inside the heat pump. Refer to Figure 4-3.

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.

Open the fill point valve.

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

When the needle of the pressure gauge is between 0.5 and 1.0
bar, close the valve.

Vent each radiator in turn, starting with the lowest one in the
system, to remove air.

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.

Figure 4-3: Auto Air Vent
If thermostatic radiator valves are fitted to all radiators, a system
by-pass must be fitted. The by-pass must be an automatic type.
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.

WARNING

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

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 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.

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 System

Page 19

5 Domestic Hot Water
5.1 Temperature Control

5.2 Heat Pump Cylinders

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.

5.2.1 General
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.

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.

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.
Refer to Appendix A (page 70) for more information.
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.
5.2.2 ErP (Energy Related Product Directive)
If a heat pump and cylinder are used as a ‘combination’, a product
fiche and energy label must be provided to the end user.
Please refer to Appendix A (page 70) for details of the correct product
fiche and label.

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.

Table 5-1: Parameters
Level

Parameter
Group

Code

Function description

Display and input value
Default

Min.

Max.

Unit

Ma ximum time for DHW request

900

1 min

Minimum time for space heating

900

1 min

Remarks

For details of how to access the parameter settings, refer to Section 9.3.

Page 20

Section 5: Domestic Hot Water

5.3 Legionella

5.4 Automatic DHW Boost Kit

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

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.

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.

NOTE

For this system to operate, the existing immersion switch must
be lef t set permanently to ON.
To totally prevent operation of the immersion element, the
existing immersion switch must be set to OFF.
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 important 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.

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 5-3 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 ex ternal connections as shown in the wiring
diagrams. See Figure 5-4.

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

WARNING

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

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 important that the temperature is
raised to at least 60°C for a period of one hour before using the
hot water.

Section 5: Domestic Hot Water

Page 21

5.4.2 Set ting
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.
Note. If you hold down either the ‘h+’ or ‘m+’ buttons for longer than
a second the figures in the display will scroll continuously.
4. Press the d
‘ ay’ 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 d
‘ ay’ 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.
IMPORTANT. Ensure that day (or days) for the OFF setting match
those for the ON setting.
7. 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 set tings
Repeatedly press the ‘timer’ button to scroll through all ON and OFF
settings.
To change an ON or OFF set ting
When a setting is showing on the display – press the ‘h+’ ‘m+’ or
d
‘ ay’ buttons to alter the setting as required.
To delete an ON/OFF set ting 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.

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 5-3.
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.

WARNING

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.

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.

Page 22

Section 5: Domestic Hot Water

TIMER

OFF ON

LCD display

Day

Day button

Timer

Timer button

MO
TU
WE
TH
FR
SA
SU

Hours adjust button

M+

Minutes adjust button

Clock button

Override button

Figure 5-3: Boost kit timeswitch

E
N
L

NOTE

Earth connections have been excluded for
clarity. Ensure all earth connections are made
prior to energising.
The HW boost pack contains a power relay and
an additional 2-pole isolator and programmable
timer.

Immersion
Heater Switch
1
2

Immersion
Heater

A1
A2

4
Red

L
N
E

Section 5: Domestic Hot Water

Cylinder
Stat

To HW Valve
HW Controls

Figure 5-4: Boost kit wiring diagram

Page 23

6 Electrical
6.1 Wiring Centre

WARNING

Electrical 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 unsafe
installation and will invalidate all guarantees.
All electrical connections made on-site are solely the
responsibility of the installer.
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.

Reset Pump
SW. SW.
Remote
Controller

18 COM

19 DHW Remote
Contact
20 ON/OFF
or
21 EHS Alarm

GND 3

ON
OFF

24VAC 4

3-way
mixing
valve

COM 5

22 Dual Set
Point
23 Control

Control 6
7
DHW
T.probe 8

24 Heating
Cooling
25 mode

OUTDOOR 9
T.probe 10

26 Flow

27 switch

Terminal
PCB

BUFFER
T.probe 12

13
Mix water
T.probe 14

RS485

Neutral N

Terminal block

EHS

Cable clamp

41
42

Heating 43
Cooling
mode
output 44

3-way
valve

Phase 51
Signal 52

Night

29 mode
Low

31 tariff

+15

Humidity
Sensor

32 RS485
GND

45 Dehumidifier
46 Electric
heater
47 Alarm
48 Pump1
49 Pump2
50 Neutral
N.C.

Figure 6-1: Terminal PCB

Page 24

Section 6: Electrical

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
ma ximum 100m with
1mm² shielded cables

Terminal

Function

Analogue Input

Digital Input

19 - 18

DHW remote contact

20 - 21

Configurable input -ON/OFF remote contact

28 - 29*

Night mode - optional

30 - 31*

Low tariff - optional

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

Voltage free contact
12V10mA

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

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.

Terminal block
Cable clamp

Connection diagrams
Unit side terminal
L

Earth

N
Earth wire
Power supply cord

Do Not Use

POWER

( L ) ( N)

Do Not Use
(L) (N)

Power supply

Figure 6-3: Power supply

Section 6: Electrical

Page 25

Consumer
unit

Lockable
isolator

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

NOTE

Cable and circuit breakers should be to EN Standards.

10 mm
Table 6-5: Power supply cable and breaker capacity
Power supply cable (mm²)

Stripped wire :10mm

Maximum

Minimum

Breaker
capacity

HPID6

2.5

1.5

16A Class C

HPID10

4.0

2.5

20A Class C

HPID16

6.0

4.0

32A Class C

Model

Terminal block

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 insert the cable cores into the proper position of the
terminal block completely.
Faulty wiring may cause not only abnormal operation but also
damage to PC board.
Fasten each screw securely.
To check the complete insertion, pull the cable slightly.

Page 26

PCB(Terminal)
Crimp terminal

Crimp terminal

In the case of long cable runs, selection of correct cable must
be done in accordance with IET Wiring Regulations (17th
edition)

•

30 mm

Sleeve

Figure 6-6: Stripping the cables

CAUTION

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.

Section 6: Electrical

6.4 Tightening Torques

6.5 Solar Thermal
It may be part of the system design to incorporate solar thermal.

Table 6-7: Tightening torques
Tightening torques
M4 screw

1.2 to 1.8 N m (12 to 18 kgf cm)

M5 screw

2.0 to 3.0 N m (20 to 30 kgf cm)

WARNING

When using crimp type terminals, tighten the terminal screws
to the specified torques, otherwise, overheating may occur and
possibly cause ex tensive damage inside the heat pump.

This is easily done with the use of an additional two-pole relay.
This can, of course be added to both monovalent and bivalent
systems. It is much easier to carry out all these types of systems
based on S-plan type controls only.
Y and W type plans can be used, but the need for additional relays
is not practical. It is much easier to convert Y and W type plans to S
types from the start.

6.6 Connection of Heating System Controls
For information relating to the connection of the heating system
controls, refer to Figure 6-10.

6.7 Connection of Remote Controller
For information relating to the connection of the remote controller,
refer to Section 7.

Section 6: Electrical

Page 27

Page 28

U(R)

V(S)

W(T)

PCB
(MAIN)

10 11

FUSE CF2
250V
T3.15A

R
B
W
W
EXP.V.

:Not available for the model without FUSE CF7

R
W
B

FUSE CF7
250V
T3.15A

Figure 6-8: HPID6 and HPID10 circuit diagram

REACTOR

U V W
（R （S
） （T
） ）

COMPRESSOR

MOTOR PUMP
(FAN)

DEFROST HEATER

4 WAY V.

G/Y

SENSOR(TEMP., OUTGOING)

SENSOR(TEMP., RETURN)

SENSOR(TEMP., SUCTION)

11
BUFFER
T.probe 12

42
Heating 43
Cooling
mode 44
output

EHS

Neutral N

RS485

N.C.

50 Neutral

49 Pump2

48 Pump1

47 Alarm

46 Electric
heater

EEPROM

BL Y

Green
Brown

Red

R
G

Black
White

Colour of wires

RAM CLEAR

Yellow

Orange

Grey

Blue

PCB
(CONTROLLER)

32 RS485
GND

45 Dehumidifier

- 16

+ 15

Low

31 tariff

29 mode

Night

27 switch

26 Flow

24 Heating
Cooling
25 mode

22 Dual Set
Point
23 Control

19 DHW Remote
Contact
20 ON/OFF
or
21 EHS Alarm

Humidity
17
Sensor
18 COM

OUTDOOR 9
T.probe 10

DHW
T.probe 8

Control 6

COM 5

24VAC 4

13
Mix water
T.probe 14

3-way
mixing
valve

GND 3

Remote
Controller

PUMP SW.

Phase 51
3-way
valve Signal 52

PCB
(TERMINAL)

ON
OFF

RESET SW.

FUSE CF1
(250V T10A)

POWER

TRANSFORMER

TERMINAL BLOCK

G/Y

SENSOR(TEMP., DISCHARGE)

SENSOR(TEMP., DEFROST)

SENSOR(TEMP., OUTDOOR)

DIP SW.

6.8 Wiring Diagrams

Section 6: Electrical

Page 29

PUMP

W
B

21 22

DEFROST HEATER

Figure 6-9: HPID16 circuit diagram

4 WAY V.

EXP.V.

H.P.SW.

SENSOR
(TEMP., OUTDOOR)

SENSOR
(TEMP.,DISCHARGE)

SENSOR
(TEMP.,SUCTION)

SENSOR
(TEMP., RETURN)

SENSOR
(TEMP., OUTGOING)

COMPRESSOR

OHR

V
B

FUSE CF2
(250V T5A)

PCB
(MAIN)

FUSE CF7
(250V T3.15A)

REACTOR

3
GR

FUSE CF6
(250V T3.15A)

G/Y

RAM CLEAR

POWER

TRANSFORMER

TERMINAL BLOCK

G/Y

PCB
(CONTROLLER)

SENSOR
(TEMP.,DEFROST)

MOTOR
(FAN)

lower

MOTOR
(FAN)

EEPROM

upper

REACTOR

Red
Green
Brown

R
G
BR

Black

Humidity
Sensor

Night

Low

32 RS485
GND

31 tariff

29 mode

27 switch

26 Flow

24 Heating
Cooling
25 mode

22 Dual Set
Point
23 Control

19 DHW Remote
Contact
20 ON/OFF
or
21 EHS Alarm

18 COM

Blue
Grey

Yellow

Orange

N.C.

50 Neutral

49 Pump2

48 Pump1

47 Alarm

46 Electric
heater

45 Dehumidifier

- 16

+ 15

Colour of wires

Signal 52

Phase 51

Heating 43
Cooling
mode
output 44

White

RS485

Neutral N
EHS

11
BUFFER
T.probe 12

OUTDOOR 9
T.probe 10

7
DHW
T.probe 8

Control 6

COM 5

24VAC 4

Mix water
T.probe 14

3-way
mixing
valve

GND 3

Remote
Controller

PUMP SW.

3-way
valve

PCB
(TERMINAL)

ON
OFF

RESET SW.

FUSE CF1
(250V T10A)

DIP SW.

6.9 System Control Wiring Diagrams

Terminals
18 and 19

Hot water

20 and 21

Heating

Figure 6-10: S-plan system connection diagram

Page 30

Section 6: Electrical

The control system shown in this diagram ensures that there can be no demand for space heating and hot water at the same time.
In order to achieve this type of operation, the programmer MUST NOT have a built-in connection between the live connection
(driving the timer) and the two programmer switches.
The programmer shown in this diagram is an example of one that meets this requirement, as the installer is required to fit links
between the mains live and the programmer swithces for mains voltage systems.
Terminals

17
18
19
20
21
22
23

1
2
3
4
5
6
7

Pipe Stat
(If fitted)

Orange (Blue)

CH ON

HW OFF

COMMON

CH OFF

LINK

1 2 3 4

4 Core ( 3 + E )
Volt free connections
from Heating and Hot
Water Zone Valves to
Terminals 18 - 20 on
ASHP Terminal PCB

Brown
Blue
Green/Yellow

240V
50HZ

10 11 12 13 14 15 16
Orange
Orange
Grey
Grey

Brown
HTG
Motor
Blue
Green/Yellow

2 1 3
Room
Stat

Figure 6-11: S-plan (HW priority) system connection diagram

Section 6: Electrical

Heating

Orange (Yellow)

Link

COMMON

LINK

HW ON

Wiring Centre

L N E

20 and 21

Grey (Red)

Horstmann H21 Series 21

E N L

Hot water

24
25

Frost
Stat

18 and 19

1
Dual Limit &
Cylinder Stat

2-Port Zone Valve

Brown
HW
Motor
Blue
Green/Yellow

2-Port Zone Valve
Page 31

7 Remote Controller
7.1 Remote Controller
The remote controller is used to switch the heat pump on and off,
display room temperature, outdoor temperature, time, to access and
check/adjust remote controller parameters.

•
•

The connection between the heat pump and the remote
controller is low-voltage, so it does not require electrical
qualifications, but do follow technical standards for electrical
equipment in making this installation.
Isolate the main power supply to the heat pump before
connecting the remote controller cable.

7.2 Installation Requirements
Notes for the remote controller installation
• Do not install the remote controller in damp conditions such as in
the bathroom. The remote controller is not waterproof
• Never install above a cooker or boiler or any other combustion
device. This would cause breakdown of electrical parts and
deformation of the outer case
• Do not install in any location subject to steam
• Do not install in any location subject to direct sunlight
• Install the remote controller a convenient position where it is out
of the reach of children
• The remote controller can be installed in the same room as
underfloor heating
• Do not install in any location where industrial chemicals are used
(ammonia, sulphur, chlorine, ethylene compounds, acids, etc.)
• Route the remote controller cable in such a way that is not in
contact with heat
• Do not damage the remote controller cable and use cable
conduit to avoid the damage

7.3 Installing the Remote Controller
1.

Slide the mounting plate downward to remove from the remote
controller (refer to Figure 7-1).

Mounting plate

Figure 7-2: Wiring hidden

When the wiring is exposed
1. Fix the mounting plate to a solid position on the wall with the
two screws provided (refer to Figure 7-3).

Mounting plate

Screw

Figure 7-3: Wiring exposed

•

Remote controller
Mounting plate

Fix the mounting plate to the wall.
When the wiring is hidden
1. Before starting the remote controller installation, pass the
wiring conduit through the inside of the wall (refer to Figure 7-2).
2. Pull out the Remote controller cord, passing it through the
wiring conduit and through the wiring hole in the mounting plate.

Do not over tighten the screws as this can deform or break
the screw hole of the mounting plate.
• Use the wall plugs if the mounting plate is to be fixed by
screws to tile, concrete or mortar.
• The remote controller is connected using the two screw
terminals on the rear of the controller. Refer to Figure 7-5.
Connect the remote controller cable to the terminal on the rear of
the remote controller:
1. Hook the wires under the clamp - locating it onto the four
hooks
• The remote controller has no polarity so wires can be
connected either way round.

Install the remote controller.
Fix the remote controller to the mounting plate by sliding it
downwards.

After installing the remote controller, check the fixing is secure.
If the mounting plate is not stable, tighten the screws further.

Figure 7-1: Removing the mounting plate
2.

Wiring conduit

Remote controller
cord

WARNING

Do not use a power screwdriver. It can damage the screw hole
which can cause contact failure.

Page 32

Section 7: Remote Controller

7.4 Connecting the Remote Controller to the Heat
Pump
1.

2.
3.

4.
5.
Figure 7-4: Remote controller (rear)

Isolate the mains power supply for the heat pump from the power
source.
Do not connect the remote controller cable with the power on.
Remove the wiring cover.
Connect the remote controller cable to terminals 1 and 2 on the
Terminal PCB. The remote controller has no polarity so it does
not matter which wire of the remote controller cable is connected
to + and -. Take care not to let your screwdriver etc. touch any
of the other electronic parts. Do not use a power driver. It can
damage the terminal screw holes.
If shielded wire is used, connect it to terminal 3 (GND) on the
Terminal PCB.
Securely fasten the remote controller cable with the cord
fastening fitting. Leave the display board waterproof cover
removed.

When the wiring is embedded
wires clamp
terminal

Remote controller
Remote controller

Terminal PCB

Hook

Remote
Controller

Remote controller
cable

Y-shaped
terminal

1
2

Shielded cable

G ND 3

Figure 7-6: Connecting the remote controller to the heat pump
An 8 metre cable is supplied with the heat pump.

gaps

hooks

The ma ximum length of the remote controller cable is 100 metres.
Use shielded wire where the length is 30 metres or longer and
connect the shielded wire to terminal 3 (GND) on the Terminal PCB.
Table 7-7: Remote controller cable

Remote controller cord

Distance

Cable (mm²)

Shield

~ 30 metres

Minimum 0.5

Non-shielded

30 ~ 100 metres

Minimum 1.0

Shielded

When the wiring is exposed
wires clamp

Hook

terminal

Y-shaped
terminal
Remote controller
cable

knock out hole

gaps

hooks

knock out hole
Figure 7-5: Connecting remote controller cable

Section 7: Remote Controller

Page 33

7.5 But tons

Door open

Figure 7-8: Remote controller (buttons)
Table 7-9: Remote controller (buttons)
No.

But ton name

ON/OFF

N/A

Timer for low tariff/
night mode
(key lock)

Return

-,+

Description
Push and hold the button for 3 seconds to turn ON and turn OFF the heat pump.
The green LED on the ON/OFF button is lit when the heat pump is ON.
The red LED on the ON/OFF button blinks when an error alarm on the heat pump occurs.
This button is reserved for future products - pressing this button will result in an audible ‘beep’ indicating no function.
Programming: dedicated button for accessing the menu/parameters.
Push and hold the Menu button for 3 seconds to access the user level.
Refer to Sections 8.6 and 8.7 for details of low tariff/night mode operation.
Push the Low tariff/Night button for 3 seconds to lock the button. When Key Lock is active, push 3 seconds to unlock.
When key Lock is active, it is only possible to turn OFF the heat pump with the ON/OFF button.
For low tariff/night mode function, an external timer must be connected.
Return button in parameter programming mode.
Push the Return button for 3 seconds to return to the normal display mode.
For parameter setting, select or return to the parameter group or code.
Push the Menu,–,+ button together for 3 seconds to access the installer level.
During error code display, push – and + button together for 3 seconds to reset display.
Push the Set button:
-During the programming to save the setting.
-Change display : Clock → Room set temperature
Time setting can be set by remote controller only
Push the Set button for 3 seconds to set the current time (day, hour, minutes).
Refer to Section 9 (Commissioning)

Set (confirm)

Up, down

N/A

This button is reserved for future products - pressing this button will result in an audible ‘beep’ indicating no function.

N/A

This button is reserved for future products - pressing this button will result in an audible ‘beep’ indicating no function.

N/A

This button is reserved for future products - pressing this button will result in an audible ‘beep’ indicating no function.

Page 34

For parameter setting, change the parameter group and code numbers.
Please note: this is not to be used for setting the room temperature control.

Section 7: Remote Controller

7.6 Display Panel
For guidance on the operation and setting of the remote controller, refer to Section 9 (Commissioning).
Table 7-11: Back light display
Back light display
ON

Door of remote controller open

OFF

Door of remote controller closed
or
Door of remote controller open but no
operation of buttons for 60 seconds

To adjust the back light operation, refer to Section
9.9.

Figure 7-10: Remote controller (display panel)
Table 7-11: Display panel
No.

Icons

Description

Power is ON, but ON/OFF switch is OFF (the heat pump is stopped)

Indicates current time of day.

Room air temperature, Outdoor temperature

Key lock is active

Display in time band setting
Frost protection is active
Defrost cycle is active
Low tariff mode is enabled*
Night mode is enabled*
When this symbol is lit, heating mode is enabled. When this symbol is flashing, the heat pump is in heating mode, however the
heating is stopped for the production of DHW which has priority
Not available

Heat pump fan is active
System pump is active
Compressor active
Flashing: compressor delay
Indicates DHW demand
On: demand
Not available
Not available
Not available

Not available

Display alarm icon, and indicate error code
Clock, Parameters value

Day of the Week

* For low tariff/night function , an external timer must be connected. Refer to Section 6.

Section 7: Remote Controller

Page 35

8 Operation
8.1 Heat Pump Operation
The heat pump control is based on:
1. Outgoing water temperature (measured by outgoing water
temperature sensor on heat pump)
2. Thermal store temperature
During heating operations, parameter 4100 is set to 1. The control of
the heat pump is based on the outgoing water temperature.
The operation by water temperature can be “outgoing water
temperature” or “thermal store temperature”. If parameter 5111 is
set to “enable” for thermal store temperature sensor. In this case the
operation will be based on thermal store temperature.
Set the parameter correctly for enable/disable of thermal store
(parameter 5111), the main water pump setting (parameter 4200).
Refer to Table 8-1.
Table 8-1: Parameters

Outgoing water
temperature
Thermal store
temperature

Parameter 5111
thermal store
temperature

Parameter 4100
heat pump ON/
OFF

Parameter 4200
main water
pump

0=disable

1=Water set
point

0=always ON
2=detect cycle

0=room set
point

0=always ON
1=thermal store
temperature
2=detect cycle

1=enable

For further information, refer to Section 3.8 (buffer tanks).
8.1.1 Heat Pump controlled based on Outgoing Water
Temperature
Based on the outgoing water temperature setting, the compressor is
controlled and turned ON/OFF.
Start of Operation
When the outgoing water temperature is below the water set point, the
heat pump is turned ON.
Heating : Outgoing water temp ≥ Water set point (parameter
2100~2105) – Hysteresis (parameter 2141)
Compressor Control
The compressor is controlled so that the Outgoing water temperature
can reach the water set point.
When the water setpoint temperature is reached, compressor
is stopped
With the minimum compressor frequency, if the Outgoing water
temperature is in the following conditions, or if the Outgoing water
temperature reaches the water set point to protect heat pump, then
compressor shall be turned OFF.

Heating : Outgoing water temp. ≥ Water set point (parameter
2100~2115) +1°C
Outgoing water temp. ≥ 60.5°C
Compressor OFF→ON control
When the Outgoing water temperature reaches the set point and after
the compressor is turned OFF, or when the conditions below are met,
the compressor shall be turned ON.
However, the compressor is not turned ON during 3 minutes OFF-ON
waiting time.
8.1.2 Heat Pump controlled based on Thermal Store
Temperature
In order to reach the thermal store set point, compressor frequency
shall be controlled so that outgoing water temperature can reach the
ma ximum temperature in Heating mode (60°C) And, the compressor
is turned ON/OFF based on thermal store set point also being
reached.
Start of Operation
When the Outgoing water temperature does not reach the water set
point, heat pump is turned ON.
Compressor Control
The compressor is controlled to reach the ma ximum flow temperature
in Heating mode (60°C).
When the water set point is reached, compressor is stopped
The compressor shall be turned OFF if the thermal store set point
is reached, or if the Outgoing water temperature is in the following
conditions, or the Outgoing water temperature reaches the set point to
protect heat pump.
Heating: thermal store temperature ≥ thermal store set point
(parameter 2161)
Outgoing water temp. ≥ Ma ximum Outgoing water set point (60°C)
+1°C
Outgoing water temp. ≥ 62.5°C
Compressor OFF→ON control
When the thermal store temperature reaches the set point, or when
the conditions below are met after the compressor is turned OFF due
to the set point protecting the heat pump, the compressor is turned
ON.
However, the compressor is not turned ON during 3 minutes OFF-ON
waiting time.
Heating: thermal store temp. ≤ thermal store set point (parameter
2161) – Hysteresis (Parameter 2141)
Outgoing water temp. ≤ Water set point (60°C) – Hysteresis
(parameter 2141)
Outgoing water temp. ≤ 57.5°C

Table 8-2: Parameters
Level

Parameter
Group

Code

Function description

Display and input value
Default

Min.

Max.

Unit

The heat pump turns ON/OFF based on
1=water set point

Type of configuration of main water pump
0=always ON

Terminal 11-12: thermal store temperature probe
0=disable
1=enable

Remarks
To be set to
the following
combinations
parameter 5111=0
→Parameter
4200=0 or 2
parameter 5111=1
→Parameter
4200=0 or1 or 2

For details of how to access the parameter settings, refer to Section 9.3.

Page 36

Section 8: Operation

Based on Water Temperature

Heating mode
Heat pump ON
OFF
Maximum
Compressor (Hz)
minimum
OFF

set temp. + 1
Water set temp. (°C)
set temp. - 1
set temp. - Hysteresis

Water temperature is stable

Heating ON
Figure 8-3: Based on water temperature

8.2 Water Pump Management
8.2.1 Main water pump
Fundamentally, the ON/OFF of the main water pump links to ON/
OFF of the compressor, but the setting ON/OFF of the pump during
compressor OFF states, due to reaching the room set point shall be
set in the following parameters:
• Always ON, apart if any alarms are active or if the heat pump is
in OFF mode
• ON/OFF based on thermal store temperature
• ON/OFF based on detect cycle
If the thermal store temperature probe is enabled, the main water
pump turns ON if the thermal store temperature is lower than outgoing
water set point (fixed or calculated by climatic curve) – hysteresis, in
heating mode. When the thermal store temperature reached the set
point (fixed or calculated by climatic curve), the main pump turns OFF.
8.2.2 Continuous operation “Always ON”
When the heat pump is set to “heating” (i.e. not in standby) the main
water pump will always remain ON.
When the heat pump is set to standby, the pump will remain OFF and
will only be started in the conditions described in paragraph in Section
8.3 (Frost protection).

Comp. OFF
set point + 1°C
× 3min

Comp. OFF → ON

8.2.3 Detect operation “Detect cycle”
In order to minimise energy consumption, the main water pump
can be configured to start only when there is demand from the
temperature controller.
The pump will be activated periodically, for a time set by parameter.
Five seconds before the cycle ends, if the outgoing water temperature
is lower than “water set point – hysteresis”, the compressor will be
activated and the pump will remain ON. When the compressor stops,
the pump will continue running for a time set by parameter, after
which it will be switched OFF and will repeat the detect cycles.
The interval between one detect cycle and the next is set by a
parameter.
Refer to Figure 8-5.

NOTE

The ‘detect cycle’ is allowed only for space Heating. If the heat
pump is working to produce DHW the main water pump has to
run continuously.

Table 8-4: Main water pump parameters
Level

Parameter
Group

Code

Function description

Display and input value
Default

Min.

Max.

Unit

Type of configuration of Main water pump
0=Always ON

Terminal 11-12 : thermal store temperature probe
0=disable
1=enable

Remarks
To be set to
the following
combinations
parameter 5111=0
→Parameter
4200=0 or 2
parameter 5111=1
→Parameter
4200=0 or1 or 2

For details of how to access the parameter settings, refer to Section 9.3.

Section 8: Operation

Page 37

Compressor ON
OFF
(5sec)
Water temp. detect
Main water pump ON
OFF
(3min)

(5min)

(3min)

Delay time
OFF

Time OFF

Time ON

Figure 8-5: Detect cycle
Table 8-6: Detect cycle parameters
Level

Parameter
Group

Code

Display and input value

Function description

Default

Min.

Max.

Unit

Type of configuration of Main water pump
0=always ON
1=ON/OFF based on thermal store temperature
2=ON/OFF based on Detect

Time ON main water pump for detect cycle

1min

Time OFF main water pump

1min

Delay time OFF main water pump from OFF compressor

1min

Terminal 11-12 : thermal store temperature probe
0=disable
1=enable

Remarks

To be set to
the following
combinations
Parameter 5111=0
→Parameter
4200=0 or 2
Parameter 5111=1
→Parameter
4200=0 or1 or 2

For details of how to access the parameter settings, refer to Section 9.3.

8.2.4 Unblock pump function
When the heat pump is stopped for more than 48 hours, the water
pump turns ON for few seconds to prevent seizing up and increases
the life time of the pump.
In the case of the main pump and the additional pump, the down time
after the previous operation stop is counted individually. Furthermore,
the pump operation time can be set individually to prevent seizing.
Level

Parameter
Group

Code

Display and input value

Function description

Default

Min.

Max.

Unit

OFF time for unblock pump function start

240

1hr

Time ON main water pump for unblock pump function

1sec

Remarks

Table 8-7: Unlock pump function parameters
8.2.5 Pump output adjustment function
Adjust the main water pump output so that the required flow rate is
produced in the heating system.
Using the DIP SW on the Terminal PCB, three level settings are
possible.

NOTE

An excessively low flow rate may cause problems including
reduced capacity and poor circulation.

DIP SW.
ON 1 2 3 4 5 6 7 8
OFF
ON 1 2 3 4 5 6 7 8

To select one of the three performance curves, set DIP SW5 and DIP
SW6 as shown in Figure 8-8.
Factory default setting:
DIP SW5 and DIP SW6 set to OFF (level 3)

OFF
ON 1 2 3 4 5 6 7 8
OFF

Level 3
(Maximum)
Level 2
(Medium)
Level 1
(Minimum)

Figure 8-8: Pump output adjustment flow rate - dip switches

Page 38

Section 8: Operation

8.2.6 Additional water pump
Parameter 5148 can be utilised to use an additional water pump.

HPID6

Parameter 4220 can be used to set the desired type of pump
operation as follows:
1. Depending on main water pump setting
2. Depending on main water pump setting but always OFF when
DHW mode is activated
3. Always ON apart from if any alarms are active or if the heat pump
is in OFF mode

(m)
12
11

Level3

10
9

Level2

8
7
6

Level1

5
4

Option 2 is recommended for the majority of applications.

The connection between neutral and terminal 48 (Pump1) is limited to
1 amp, therefore a relay must be installed if an additional water pump
is used. Refer to Figure 8-12.

2
1
0

20(L/min)

Figure 8-9: Pump output adjustment flow rate - HPID6

HPID10

In reference to option 3 above (and parameter 4220 in Table
8-13), ‘OFF’ mode means there is a power supply to the heat
pump but there is no heating or hot water demand.

(m)
8
7
Level3

NOTE

Level2
5

Level1

45 Dehumidifier

Neutral N

46 Electric
heater

47 Alarm

EHS

1
0

230V 50Hz

Terminal PCB

Figure 8-10: Pump output adjustment flow rate - HPID10

48 Pump1

Heating 43
Cooling
mode 44
output

40(L/min)

Additional water pump

49 Pump2

Figure 8-12: Additional water pump

HPID16
(m)
14
Level3

12
10

Level2

Level1

6
4
2
0

50(L/min)

Figure 8-11: Pump output adjustment flow rate - HPID16

CAUTION

The water flow rate must be suf ficient to achieve an 8K
dif ference between the flow and return water temperatures.
Table 8-13: Additional water pump parameters
Level

Parameter
Group

Code

Function description

Display and input value
Default

Min.

Max.

Unit

Terminal 48
0=disable
1=additional water pump

Type of operation of additional water pump
0=disable
1=depending on main water pump setting
2=depending on main water pump setting but always OFF when
the DHW mode is activated
3=always ON, apart from if any alarms are activated or if the
heat pump is in OFF mode

Remarks

For details of how to access the parameter settings, refer to Section 9.3.

Section 8: Operation

Page 39

8.3 Frost Protection
Frost protection can be activated when the heat pump is in OFF
mode.
This is based on either:
•
Outdoor air temperature
•
Outgoing water temperature
8.3.1 Frost Protection based on Outdoor Air Temperature
The frost protection function is always active, even when the heat
pump is not operating (but the mains supply is switched on). The
water pump is activated if the outdoor air temperature (measured
by the heat pump outdoor temperature sensor) is less than the start
temperature - parameter 4311 (default: 4°C). It is deactivated when
the outdoor air temperature reaches ‘outdoor air temperature set point
+ Hysteresis’ - parameter 4311 plus the hysteresis parameter 4312
(default: 7°C).

Water pump deactivation
hysteresis
(3.0°C)

Water pump ON

OFF
(4.0°C)
start temperature

Outdoor air temperature
(HP unit built-in sensor)

Figure 8-14: Frost protection - water pump

Backup heater
hysteresis
(3.0°C)

Backup heater ON

OFF
(4.0°C)
Backup heater
set point

Flow water temperature

Figure 8-15: Frost protection - backup heater

Table 8-16: Frost protection (outdoor air temperature) parameters
Level
I

Parameter
Group

Code

Function description
Start temperature of Frost protection on Outdoor air temperature

Display and input value
Default

Min.

Max.

Unit

4.0

0.0

10.0

0.5°C

Hysteresis of Outdoor air temperature

3.0

0.5

5.0

0.5°C

Backup heater set point during Frost protection

4.0

0.0

10.0

0.5°C

Hysteresis of Flow water temperature

3.0

0.5

5.0

0.5°C

Terminal 46 : DHW Electric heater or Backup heater
0=DHW Electric heater
1=Backup heater

Remarks

For details of how to access the parameter settings, refer to Section 9.3.

Page 40

Section 8: Operation

8.3.2 Frost Protection based on Flow Water Temperature
The frost protection function is always active, even when the heat
pump is not operating (but the mains supply is switched on).
The water pump is activated if the flow water temperature is less than
the start temperature - parameter 4321 (default 4°C) and deactivated
when the flow water temperature reaches ‘flow water temperature set
point (parameter 4321) + hysteresis - parameter 4322 (default 3°C)’

Water pump deactivation
hysteresis
(3.0°C)

Water Pump ON

OFF
(4.0°C)
start temperature

Flow water temperature

Figure 8-17: Frost protection - water pump

Backup heater
hysteresis
(3.0°C)

Backup heater ON

OFF
(4.0°C)
Backup heater
set point

Flow water temperature

Figure 8-18: Frost protection - backup heater

Table 8-19: Frost protection (flow water temperature) parameters
Level
I

Parameter
Group

Code

Function description
Start temperature of Frost protection on Flow water temperature

Display and input value
Default

Min.

Max.

Unit

4.0

0.0

10.0

0.5°C

Hysteresis of Flow water temperature

3.0

0.5

5.0

0.5°C

Backup heater set point during Frost protection

4.0

0.0

10.0

0.5°C

Hysteresis of Flow water temperature

3.0

0.5

5.0

0.5°C

Terminal 46 : DHW Electric heater or Backup heater
0=DHW Electric heater
1=Backup heater

Remarks

For details of how to access the parameter settings, refer to Section 9.3.

Section 8: Operation

Page 41

8.4 ON/OFF DHW Production Remote Contact
The heat pump operation for DHW production is controlled from a
remote contact, e.g. a cylinder thermostat or motorised valve switch.
The remote ON/OFF DHW contact is enabled by parameter
5119. Refer to Table 8-21. The DHW mode cannot be controlled
automatically by the remote controller.
When DHW is turned ON by the remote contact and the heat pump is
ON it will start operation in DHW (comfort) mode.

DHW ON/OFF remote contact

Terminal PCB

Contact OPEN = DHW OFF
Contact CLOSE = DHW ON
(Comfort)

18 COM
19 DHW Remote
Contact

Figure 8-20: ON/OFF DHW production remote contact

NOTE

In order to use DHW function, it is necessary to set parameter
3101=1 and parameter 5119=1.

NOTE

Turn ON both remote controller using ON/OFF but ton, and
DHW ON/OFF remote contact to start heat pump for DHW.
Table 8-21: DHW ON/OFF contact parameters
Level

Parameter
Group

Code

Function description

Display and input value

Remarks

Default

Min.

Max.

Unit

DHW production priority setting
0=DHW is unavailable
1= DHW is available, and priority DHW over space heating
2= DHW is available, and priority space Heating over DHW

Terminal 19-18 : DHW remote contact
0=disable (Remote controller only)
1=enable

For details of how to access the parameter settings, refer to Section 9.3.

Page 42

Section 8: Operation

8.5 ON/OFF Heating Remote Contact
The heat pump operation for heating is controlled from a remote
contact, e.g. an external programmer, motorised valves and/or a
room thermostat.
The ON/OFF heating contact is enabled by parameter 5120. Refer to
Table 8-23.
The heating operation cannot be automatically controlled by the
remote controller.
Heat pump will be turned ON/OFF according to remote contact.
For heating operation, both the remote controller and remote contact
must be ON. If remote contact is turned OFF, then the heating will be
turned OFF as well. Refer to Table 8-23.
If the remote controller is turned OFF, then the heat pump will be
turned OFF.

ON/OFF remote contact

Terminal PCB

Contact OPEN = HP unit OFF
Contact CLOSE = HP unit ON

20 ON/OFF
or
21 EHS Alarm

Figure 8-22: ON/OFF heating remote contact
Table 8-23: Heating ON/OFF contact parameters
Level

Parameter
Group

Code

Function description

Display and input value

Terminal 20-21 : ON/OFF remote contact input
0=disable (Remote controller only)
1=ON/OFF remote contact
2=EHS Alarm input

Remarks

Default

Min.

Max.

Unit

ON/OFF by
Remote controller
0=enable
1= On/Off enable
2= enable

For details of how to access the parameter settings, refer to Section 9.3.

Table 8-24: Remote controller / remote contact operation
Remote controller connected

Heat pump unit status

Remote controller

Remote contact

Heat pump

Heating

→

OFF

→

ON*

OFF

→

OFF

→

OFF

* Heat pump will be on standby or could be operating for DHW production

NOTE

The frost protection is active even when the heat pump is
switched OFF from the ON/OFF (heating) remote contact.

Section 8: Operation

Page 43

8.6 Night Mode
If there is a need to reduce the electricity consumption or noise
produced by the compressor, e.g. in night-time operation, it is
possible to activate the night mode function using an external
contact, e.g. a timeswitch (with volt free contacts) connected between
terminals 28-29 on the PCB terminal.
To enable these terminals, parameter 5128 must be set to 1. Refer to
Table 8-26.
When the night mode function starts, according to the time setting,
the ma ximum frequency will be decreased to the value selected on
parameter 4111 in the ON time by time band setting (refer to Table
8-26). Otherwise it will operate in normal mode.

Night mode contact

Terminal PCB
28
29

Contact OPEN = Night mode OFF
Contact CLOSE = Night mode ON

Night
mode

Figure 8-25: Night mode

NOTE

Parameter 5128 (night mode) and parameter 5130 (low tarif f are
automatically synchronized to same value.
If parameter 5128 is changed to 1 (enable), then parameter
5130 will be also changed to 1 (enable).
With parameters 5128 and 5130 both set to 1 (enable), the night
mode and low tarif f function will operate independently of each
other.

NOTE

During night mode with night mode contact ON, if parameter
5128 is changed to 0, the heat pump will continue to operate in
night mode.
During night mode by the remote controller but ton, if
parameter 5128 is changed to 1, the heat pump will follow the
signal of ON/OFF by night mode contact.

Table 8-26: Night mode parameters
Level

Parameter
Group

Code

Function description

Terminal 28-29 : Night mode
0=disable (Remote controller only)
1=enable

Ma ximum frequency of Night mode

Display and input value
Default

Min.

Max.

Unit

100

Remarks
Parameter 5128
and parameter
5130 are
synchronized in
same value

For details of how to access the parameter settings, refer to Section 9.3.

Page 44

Section 8: Operation

8.7 Low Tarif f
The purpose of this function is to heat any thermal stores and DHW
cylinders at a time when electricity rates are inexpensive.
This can be achieved by using an external contact, e.g. a timeswitch
(with volt free contacts) connected between terminals 30-31 on the
PCB terminal.
To enable these terminals, parameter 5130 must be set to 1. Refer to
Table 8-28.
When low tariff function is activated the heating set point (calculated
by the climatic curve) increases for heating (parameter 2151) by the
low tariff differential water set point (refer to Table 8-28).

Low tariff contact

Terminal PCB
30
31

Contact OPEN = Low tariff OFF
Contact CLOSE = Low tariff ON

Low
tariff

Figure 8-27: Low tariff mode

NOTE

Parameter 5128 (night mode) and parameter 5130 (low tarif f)
are automatically synchronized to same value.
If parameter 5128 is changed to 1 (enable), then parameter
5130 will be also changed to 1 (enable).

NOTE

During low tarif f with low tarif f contact ON, if parameter 5130
is changed to 0, the heat pump will continue to operate in low
tarif f.
During low tarif f by the remote controller but ton, if parameter
5128 is changed to 1, the heat pump will follow the signal of
ON/OFF by low tarif f contact.

Table 8-28: Low tariff mode parameters
Level

Parameter
Group

Code

Function description

Terminal 30-31 : Low tariff
0=disable (Remote controller only)
1=enable

Low tariff deferential water set point for Heating

Display and input value
Default

Min.

Max.

Unit

5.0

0.0

60.0

0.5°C

Remarks
Parameter 5128
and parameter
5130 are
synchronized in
same value

For details of how to access the parameter settings, refer to Section 9.3.

Section 8: Operation

Page 45

9 Commissioning
9.1 System Setup
The numbers in Figure 9-1 will be used for the system setup in this
section.

Door open

Figure 9-1: Remote controller buttons
3.
9.1.1 Turning the Heat Pump On and Of f
Press ON/OFF switch j for three seconds to turn the heat pump on
or off. The green LED of ON/OFF switch is lit when the system is ON.

When the day of the week is set, 12:00 blinks; set the current
time by pressing the - or + button.

The heat pump will start in response to a demand for either heating or
DHW.

NOTE

The heat pump may take up to seven minutes af ter the demand
as the heat pump will run the circulating pump and check the
water temperature in the system before starting.

When the - or + buttons o is pressed, the time changes in one
minute increments; when the - or + buttons o is pressed and
held, it changes in ten minute increments.
Press the Set button p to save the time setting. Then the display
reverts to normal operation.

9.2 Set ting the Day and Time
1.
2.

Press the Set button p for three seconds.
The day ‘Mon’ indicator will blink.
Select the day by pressing the - or + buttons o and press set
button p to save the setting.
The day display stops blinking.
The accuracy of the clock is ±30 second/month.
If there is a power cut, the day and time setting is maintained for
approximately 24 hours. If the power cut continues over 24 hours, the
day and time must be reset.
After installation and before setting the time or when the heat pump is
reset after a power cut (lasting over 24 hours), the ‘12:00’ and ‘Mon’
will blink, indicating that the time must be reset.

Page 46

Section 9: Commissioning

9.3 Access for Parameter Set tings
The parameters are accessed and set using the remote controller.
There are two levels of access for parameter settings.
Access levels:
• U – End user level (accessible to user only)
• I – Installer Level (accessible to user and installer)

9.5 Accessing the Parameter Set ting Menu (Installer
level)
In the INSTALLER level more parameters can be accessed than in the
USER level. The procedure for accessing, checking and setting the
parameters is as follows:
1.

Press the Menu l and the – and + o buttons on the remote
controller simultaneously for three seconds to enter the installer
level.

9.4 Accessing the Parameter Set ting Menu (User
level)

“InSt” parameter number “0000” and parameter value “----“ will
be shown on the display.

The procedure for accessing, checking and setting the parameters is
as follows:

The first two digits of the 4-digit parameter number (the
parameter group number) will blink.

Press the Menu button l on the remote controller for three
seconds to enter the user level.

Set the parameter group number, as required, using the Up or
Down q buttons.

Parameter number “0000” and parameter value “----“ will be
shown on the display.

Press the – and + o buttons to switch to the parameter code
and the second two digits will blink.

The first two digits of the 4-digit parameter number (the
parameter group number) will blink.

Set the parameter code number, as required, using the Up or
Down q buttons.

Set the parameter group number, as required, using the Up or
Down q buttons.

Press Set p and the parameter value will be displayed and will
blink.

Press the – or + buttons o to switch to the parameter code and
the second two digits will blink.

Set the parameter to the required value using the Up or Down q
buttons.

Set the parameter code number, as required, using the Up or
Down q buttons.

Press the Return n or Set p button. The parameter code
number will blink to allow setting of another parameter, if
required.

Press Set p and the parameter value will be displayed.

Refer to Sections 9.4 and 9.5 for how to access the above levels as
there is a different procedure for each level.

For ‘read-only’ items the number displayed remains on (not
blinking) and pressing the Set button p does not affect the
display.
8.

If an invalid parameter (not accessible to the user) is entered and
the Set button p pressed “----“ is displayed. Press the Return
button n to return to the parameter number.

If the parameter value can be adjusted it will blink.

10. Set the parameter to the required value using the Up or Down q
buttons.
11. Press the Return n or Set p button. The parameter code
number will blink to allow setting of another parameter, if
required.
12. To return to normal operation, press and hold the Menu button l
for three seconds, or simply leave the remote controller for ten
minutes.

Section 9: Commissioning

10. To return to normal operation, press and hold the Menu l and
the – and + o buttons simultaneously for three seconds, or
simply leave the remote controller for ten minutes.
Master Reset (reset ting all parameters to their defaults)
All parameters can be reset to their original defaults. The procedure is
as follows:
1.

Press the Menu l and the – and + o buttons on the remote
controller simultaneously for three seconds to enter the installer
level.

Press and hold the low tariff/night mode (key lock) m button for
ten seconds. All parameters will now be reset.

To return to normal operation, press and hold the Menu l and
the – and + o buttons simultaneously for three seconds, or
simply leave the remote controller for ten minutes.

Page 47

9.6 Parameters Input/Output
The following parameter settings must be checked on commissioning.
Table 9-2: Parameters input/output
Level

Parameter

Function description

Display and input value

Group

Code

Default

Min.

Max.

Unit

Terminal 19-18 : DHW remote contact
0=disable (Remote controller only)
1=enable

Terminal 20-21 : ON/OFF remote contact (CH)
Alarm input
0=disable
1=ON/OFF remote contact

Terminal 28-29 : Night mode*
0=disable
1=enable
Refer to Section 8.6.

Terminal 30-31 : Low tariff*
0=disable
1=enable
Refer to Section 8.7.

Terminal 46 : DHW Electric heater or Backup heater
0=DHW Electric heater
1=Backup heater

Remarks

ON/OFF by
Remote controller
0=enable
1=ON/disable
OFF/enable
2=enable

Parameter 5128
and Parameter
5130 are
synchronised in
same value

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

9.7 Remote Controller Back Light Display Parameters
The following parameters can be changed to adjust the back light
display.
Table 9-3: Back light display parameters
Level

Parameter
Group

Code

Function description
Back light display at door open
0=OFF
1=ON

Display and input value
Default

Min.

Max.

Unit

Time to turn off the back light display

300

10 sec

Time to back to normal display screen

120

300

10 sec

Remarks

For details of how to access the parameter settings, refer to Section 9.3.

Page 48

Section 9: Commissioning

9.8 Anti-freeze Function Set ting

Pump SW.

Refer to Section 3.10.2 and 3.10.3.

9.9 Pump Operation and Air Bleeding from Heating
System
The circulating pump can be operated to aid removal of the air from
the heating system.
To operate this function access the Terminal PCB.
Check DIP SW4 is set to ‘OFF’.

Display

NOTE

Dip switch positions:
Up: ON / Down: OFF

Figure 9-4: Water loading and air bleeding in the hydraulic circuit

Press the Pump SW. Refer to Figure 9-4.
Wait for a few seconds. The pump will start and each of the six outer
digital segments on the right-hand digit of the display on the terminal
PCB will light up sequentially during pump operation.
The pump stops automatically after 10 minutes of operation. If all the
air could not be released from the water circuit, press Pump SW again
(after the pump has stopped) to operate the pump for another 10
minutes.
If you want to stop the pump before it stops automatically, press
Pump SW again.

Section 9: Commissioning

Page 49

10 Servicing
10.1 General

10.3 Condensate Disposal

Grant UK Aerona³ Heat Pumps require only the minimum of routine
servicing and maintenance.

Check that the condensate drain hole in the bottom of the heat pump
is not blocked.

This should be carried out on an annual basis and consist of the
following:

10.4 Heating System Connections

Heat pump - check:
• Visual condition of the heat pump
• Any debris/obstructions for the evaporator fins – remove if found
• The fan outlet is not obstructed - remove if found
• Condensate drain opening is clear
• Flexible hose condition
• Pipe insulation condition
• Remote controller settings
• That no refrigerant is leaking
Heating system - check:
• Expansion vessel pressure
• Operation of pressure relief valve
• Heating system pressure – top up if necessary
• Correct concentration of corrosion/antifreeze protection
• Heating and hot water controls settings
• Any leaks on system
• For any sign of leakage from the refrigerant circuit - refer to
Section 10.6.
• Magnetic filter is cleaned

Check the condition of the flexible hoses. Replace if damaged or
leaking.

10.5 Heat Pump Controls
Check that settings on the remote controller are as set when
commissioned. Refer to settings given in the relevant sections of these
instructions. Reset to commissioned settings if necessary.

10.6 Refrigerant
Under no circumstances should the refrigerant be vented from the
charging points on the refrigerant circuit of the heat pump.
If any work is required to be carried out on the refrigerant circuit, it
MUST be undertaken by an F-gas registered refrigeration engineer
On no account should any such work be carried out by unqualified
personnel.

Master Reset (reset ting all parameters to their defaults)
All parameters can be reset to their original defaults. The procedure is
as follows:
1.

Press the Menu l and the – and + o buttons on the remote
controller simultaneously for three seconds to enter the installer
level.

Press and hold the low tariff/night mode (key lock) m button for
ten seconds. All parameters will now be reset.

To return to normal operation, press and hold the Menu l and
the – and + o buttons simultaneously for three seconds, or
simply leave the remote controller for ten minutes.

10.2 Air Inlet and Outlet
The air inlet grille and evaporator must be checked and leaves or
any other debris removed from the space between the grille and the
evaporator fins.

CAUTION

Take care not to damage or distort the Aluminium fins of the
evaporator when removing any debris.
Ensure that both the air inlet to the evaporator and the discharge from
the fan outlet are unobstructed. Any foliage, plants, etc. near the heat
pump must not be allowed to grow over the heat pump.
Under no circumstances should anything be stacked on or against
the heat pump.
Refer to Section 3.5.2 for the required clearances around the heat
pump.

Page 50

Section 10: Servicing

10.7 Monitor Display Function
The heat pump operating conditions, as listed in Table 10-3, can be
displayed and checked on either the remote controller or Terminal
PCB.

Door open

Figure 10-1: Remote controller buttons
Display on Remote controller
1. Press Return n button for three seconds to enter monitor mode
and display the user level value of parameter group 01. A 2
digit code number of parameter group 01 (default value is 00)
will be displayed on the left of remote controller screen. The
corresponding parameter value will displayed on the right of the
screen (default value is ----. )
2. Press the Up or Down q buttons to change the code number
and then press the Set p button to display the parameter value.
Only code numbers from 00 to 09 can be displayed.
3. To return to normal display, press and hold the Return n button
for three seconds or simply do nothing and leave it for about ten
minutes.
Display on Terminal PCB display
• Set the DIP SW4 on the Terminal PCB to ‘ON’ (up) to display the
monitor number and monitor data alternately.
• Push the Pump SW. of the Terminal PCB to switch the display
number alternately.
• To return to normal display, set the DIP SW4 to ‘OFF’ (down).

Terminal PCB

Pump SW.

DIP SW4 = ON
ON
OFF
number

moniter data
alternately

Pump SW.
change number

Figure 10-2: Display on Terminal PCB display

Table 10-3: Monitor display
Terminal
PCB

Remote controller

Number

Parameter

Display and input value

Function description
Default

Minimum

Maximum

Unit

Circulating water return temperature

-20

100

1°C

Compressor operating frequency

200

1Hz

Discharge temperature

-20

150

1°C

Current consumption value

9900

100W

Fan control number of rotation

1000

10rpm

Defrost temperature

-20

100

1°C

Outdoor air temperature

-20

100

1°C

Water pump control number of rotation

9900

100rpm

Suction temperature

-20

100

1°C

Circulating water flow temperature

-20

100

1°C

Section 10: Servicing

Page 51

11 Fault Finding
11.1 Error Code Display
In the event that a fault is detected, a red LED on the ON/OFF switch
of the remote controller will flash and a warning icon and error code
will be displayed on LCD screen and also on the Terminal PCB
display.

LED(red)

Remote controller

Terminal PCB
Reset SW.

Warning icon
and error code

Pump SW.

Display

Figure 11-1: Error code display

11.2 Error History Display

11.3 Reset Error Code Display

The previous 10 error codes can be displayed on Terminal PCB
display.

Auto
Once it returns to normal condition, the error will automatically be
reset.

Procedure to display on Terminal PCB display:
1. Press Pump SW and Reset SW on Terminal PCB at the same
time for five seconds and the error history order and error code
will be displayed alternately. The first one is the latest error code.
2. Press Pump SW to go through the history order up to the 10th
error code and then go back to the latest error code.
3. When there is no error history, ‘--’ will be displayed.
If no operation is carried out for five minutes or both the Pump SW and
Reset SW are pressed together for five seconds, the display returns to
normal display.

When the heat pump stops, it may not possible to reset automatically.
In this case, reset manually.
Manual
To reset, press – and + button at the same time for three seconds, or
press Reset SW on the Terminal PCB.
Refer to Figure 11-2.
It is possible to reset by turning the mains power supply switch OFF
→ ON, although this is not recommended.

Deletion of the error history:
During error code display, press Reset SW for ten seconds to delete
the error history.

Remote controller

Terminal PCB
Reset SW.

3seconds

Figure 11-2: Resetting error code display

Page 52

Section 11: Fault Finding

11.4 Error Codes
Error
code

Method of check

Check the power supply

Confirm the power supply

Fuse CF1
HPID6: 250V 15A
HPID10: 250V 25A
HPID16: 250V 30A

Check the electric continuity of Fuse CF1
by tester

If CF1 is blown, Main PCB should be
replaced

Fuse CF3
(250V 3A)

Check the electric continuity of Fuse CF3
by tester

If CF3 is blown, Main PCB should be
replaced

Fuse CF4
HPID6: 250V 3A
HPID10: 250V 3A

Check the electric continuity of
Fuse CF4 by tester

If CF4 is blown, Main PCB should be
replaced

Main PCB

Other than described above

Main PCB should be replaced

If the same error code appears again,
Main PCB or Pump should be replaced
If other error codes appear, Fan motor
should be replaced

Fuse CF6
HPID16: 250V 3A

Operate without lead wire for Fan motor
Check the electric continuity of Fuse by
tester

Pump

Operate without lead wire for
Pump

If the same error code appears again,
Main PCB or Fan motor should be
replaced
If other error codes appear, Pump should
be replaced

Reactor

Check the resistance by tester
(0.1Ω at 20°C)

If the reactor is faulty, is should be
replaced.

Main PCB

Check the voltage of Fan motor by tester
Check the voltage of Pump by tester

If the voltage is abnormal, PCB (Main
should be replaced

Power supply

Confirm the power supply

Check the resistance by tester

If the sensor is faulty, it should be
replaced

Gas leakage

Check the service valve and refrigerant
circuit (pipe)

Collect refrigerant once, then recharge
with prescribed mass

Unreasonable
operation under/
overload

Check the place of installation (blockage
of air inlet & outlet)
Check the excess gas

Protective action
against excess

Drop of power
voltage

Check the power voltage
(230V)

Confirm the power supply voltage
(230V)

Current DC
current detection

Main PCB

Operate without the junction connector of
Compressor lead wire

If the same error code appears again,
Main PCB should be replaced

Momentary stop
of power
(In case of
lightning)

Restart operation

Compressor

Other than described above

Compressor should be replaced

Main PCB

Main PCB should be replaced

Unreasonable
operation under/
overload

Check the place of installation (blockage
of air inlet & outlet)
Check the excess gas

Current AC current
detection

Power
OFF

Figure
11-4,
11-6
Figure
11-13

Auto

Ensure the installation position to avoid
blockage of air inlet & outlet
If excess gas is observed, collect all
refrigerant once, then recharge with
prescribed mass

Manual

Ensure the installation position to
avoid blockage of air inlet & outlet
If excess gas is observed, collect all
refrigerant once, then recharge with
prescribed mass

Drop of power
voltage

Check the power voltage
(230V)

Confirm the power supply voltage
(230V)

Momentary stop
of power (In case
of lightning)

Restart operation

Section 11: Fault Finding

Figure
11-4

If CF7 is blown,it should be replaced

Check the power supply

Protective action
against excess

Figure
11-3

If CF6 is blown,it should be replaced

Sensor, Temp.
Discharge

CT disconnection

Error
reset

Fuse CF7
HPID10: 250V 3A
HPID16: 250V 3A
DC voltage error

Discharge
temperature error

Figure/
table

Power supply

Fan motor

Troubleshooting

Manual

Page 53

Error
code

Method of check

Abnormal
revolution of
compressor

Troubleshooting

Figure/
table

Error
reset

Ensure the installation position to avoid
blockage of air inlet & outlet

Unreasonable
operation under/
overload

Check the place of installation (blockage
of air inlet & outlet )
Check the excess gas

Drop of power
voltage

Check the power voltage
(230V)

Confirm the power supply voltage
(230V)

Fuse CF6
HPID6: 250V 15A
HPID10 : 250V
25A

Check the electric continuity
Fuse CF6 by tester

If CF6 is blown, Main PCB should be
replaced

Clogged the water
Pump and/or
water circuit

Check the Pump and water circuit

Remove the blockage, then restart
operation

Drop of power
voltage

Check the power voltage
(230V) during operation

Confirm the power supply voltage
(230V)

Momentary stop
of power
(In case of
lightning)

Restart operation

Compressor or
Main PCB

Other than described above

Compressor should be replaced

If excess gas is observed, collect all
refrigerant once, then recharge with
prescribed mass

Figure
11-5
Manual

Suction
temperature
sensor error

Sensor, Temp.
Suction

Check the resistance by tester

If the sensor is faulty, it should be
replaced

Figure
11-14

Defrost tem
sensor error

Sensor, Temp.
Defrost

Check the resistance by tester

If the sensor is faulty, it should be
replaced

Figure
11-14

Discharge temp.
sensor error

Sensor, Temp.
Discharge

Check the resistance by tester
(*1)

If the sensor is faulty, it should be
replaced

Figure
11-13

Check the electric continuity
Fuse CF7 by tester

If CF7 is blown, Fan motor and CF7
should be replaced
If CF7 is not blown, check the voltage of
Fan motor
If the voltage is normal, Fan motor should
be replaced
If the voltage is abnormal, Main PCB
should be replaced

Figure
11-4

Auto

Sensor, Temp.
Outdoor

Check the resistance by tester

If the sensor is faulty, it should be
replaced

Figure
11-12

Auto

Fuse CF6
(HPID16: 250V
T3.15A)

Check the electric continuity of Fuse CF6
by tester

If CF6 is blown, it should be replaced

Fuse CF7
(HPID10: 250V
T3.15A)

Check the electric continuity of Fuse CF7
by tester

If CF7 is blown, it should be replaced

Check the voltage of Fan motor by tester

If the voltage is normal, Fan motor should
be replaced
If the voltage is normal, Main PCB should
be replaced

Fuse CF7
(250V T3.15A)
C1

Upper fan motor
error
(HPID16)

Fan motor (*2)
Main PCB

Outdoor temp.
sensor error

Lower Fan motor
error
(HPID16)
Fan motor error
(HPID6 and
HPID10)

Fan motor
Main PCB

Auto

Figure
11-4
Manual

Rise of
temperature
(above 110°C) of
Main PCB

Mis-installation

Check the place of installation (blockage
of air inlet & outlet)

Ensure the installation position to avoid
blockage of air inlet & outlet

Sensor, Temp.
Main PCB

Main PCB should be replaced

Main PCB sensor
error

Sensor, Temp.
Main PCB

Main PCB should be replaced

Auto

Main PCB error

Main PCB

Main PCB should be replaced

Power
OFF

Mis wiring or rare
contact [Main
PCB - Controller
PCB connecting
cable]

Check the wiring connection and rare
contact

After correcting mis wiring, restart
operation
-

Auto

Controller PCB

Other than described above

Controller PCB should be replaced

Main PCB

Other than described above

Main PCB should be replaced

Earth wire

Check if earth wire is properly installed

Controller PCB
serial error

(*1) In case of detecting open circuit of the discharge temperature sensor, error display appears 10 minutes after start operating.
In case of detecting short circuit of the discharge temperature sensor, error display appears immediately.
(*2) When checking fan motor and/or pump, turn OFF the power supply completely and check at their terminal or connector.

Page 54

Section 11: Fault Finding

Error
code

Method of check
Turn off the power supply, wait for about
3 minutes, then power up again

Troubleshooting

If the same error code appears,
Main PCB should be replaced

Main PCB error

Main PCB

Outgoing water
temp. sensor error

Sensor, Temp.
Outgoing water

Check the resistance by tester

If the sensor is faulty, it should be
replaced

Return water
temp. sensor error

Sensor, Temp.
Return water

Check the resistance by tester

If the sensor is faulty, it should be
replaced

High pressure
switch is operating
(HPID16)

Outside air
recirculation
Clogged water
circuit

Check loose cable connections and
contacts of reactor

Check temperature difference of
Outgoing/Return water (see Monitor
display function)
Large difference means flow rate is too
low

Pump (*2)

Pump error

High pressure
switch error
(HPID16)

Compressor
overheat
protection relay
operation
(HPID16)

Water not getting warm

Make sure the position doesn’t block the
air inlet and outlet
Remove the blockage, then restart
operation

Figure/
table

Error
reset

Power
OFF

Figure
11-15

Check the voltage of Pump

If the voltage is normal, Pump should be
replaced
If the voltage is abnormal, Main PCB
should be replaced

Clogged the water
Pump and/or
water circuit

Check the pump and water circuit

Remove the blockage, then restart
operation

High pressure
switch

Check loose cable connections and
contacts

If the same error code appears, high
pressure switch should be replaced

Compressor
overheat
protection relay

Check the resistance by tester

If the compressor overheat protection
relay is blown, it should be replaced

Figure
11-10

Gas leakage

Check the service valve and refrigerant
circuit (pipe)

Correct refrigerant once, then recharge
with prescribed mass

Fuse CF2
0639U : 250V T3.15A
1039U : 250V T3.15A
1639U : 250V T5A

Check the electric continuity of Fuse CF1
by tester

If CF2 is blown,it should be replaced and
check the resistance of 4way valve and
the resistance of Defrost heater by tester

Figure
11-9

4way valve

Check the resistance of 4way valve by
tester

If 4way valve is blown,it should be
replaced

Figure
11-7

Defrost heater

Check the resistance of Defrost heater
by tester

If Defrost heater is blown,it should be
replaced

Figure
11-8

Short cycle
(insufficient air
circulation)

Check the blockage of air inlet & outlet

Ensure the installation position to avoid
blockage of air inlet & outlet

Sensor,Temp.
Outgoing water
and Return water

Check the resistance by tester

If any of these sensors is faulty, it should
be replaced

Gas leakage

Check the service valve and refrigerant
circuit (pipe)

After fixing the leakage point,collect
the refrigerant once,then recharge with
prescribed mass

Clogged water
circuit

Check temperature difference of
Outgoing/Return water (see Monitor
display function)
Large difference means flow rate is too
low

Remove the blockage,then restart
operation

Main PCB

Section 11: Fault Finding

Auto

Figure
11-6

Manual

Power
OFF

Manual

Figure
11-15

Page 55

11.5 Table of Controller PCB and Terminal PCB Alarms
Error
code

Method of check

Troubleshooting

Figure/
table

Error
reset

Power
OFF

EEPROM error

PCB(Controller)
and
PCB(EEPROM)

PCB(Controller) and PCB(EEPROM)
should be replaced

DHW temperature
sensor error

Sensor,
temperature
DHW tank

Check the resistance by tester

If the sensor is faulty, it should be
replaced

Figure
11-14

Outdoor
temperature
sensor error

Sensor,
temperature
outdoor

Check the resistance by tester

If the sensor is faulty, it should be
replaced

Figure
11-16

Thermal store
temperature
sensor error

Sensor,
temperature
thermal store

Check the resistance by tester

If the sensor is faulty, it should be
replaced

Figure
11-14

Mix water
temperature
sensor error

Sensor,
temperature
Mix water

Check the resistance by tester

If the sensor is faulty, it should be
replaced

Figure
11-14

Humidity sensor
error

Sensor, Humidity

Check the resistance by tester

If the sensor is faulty, it should be
replaced

Figure
11-11

Incorrect remote
controller wiring or
DIP SW setting

Check loose cable connections and
contacts
Check DIP SW setting

Loose interface
connection cable
or contacts

Rear side of remote controller

Remote controller

Other than described above

Remote controller should be replaced

Controller PCB

Other than described above

Controller PCB should be replaced

Incorrect remote
controller wiring
Loose interface
connection cable
or contacts

Check loose cable connections and
contacts

After having corrected the wiring, restart
operation

Controller PCB

Other than described above

Controller PCB should be replaced

Incorrect main
PCB wiring
Loose interface
connection cable
or contacts

Check loose cable connections and
contacts

After having corrected the wiring, restart
operation

Main PCB

Other than described above

Main PCB should be replaced

Controller PCB

Other than described above

Controller PCB should be replaced

Check lead wires are connected to the
connectors properly

Connect the connectors to both Terminal
PCB and Controller PCB steadily

Ensure that there is no disconnection for
the lead wires

Lead wires should be replaced

740

Remote controller
communication
error

Main PCB
communication
error

After having corrected the wiring and DIP
SW setting, restart operation
-

Terminal PCB cannot be
operated

Lead wire of
Terminal PCB

Terminal PCB does not
display anything

Terminal PCB

Other than described above

Terminal PCB should be replaced

Controller PCB

Other than described above

Controller PCB should be replaced

Page 56

Auto

Section 11: Fault Finding

11.6 Error Codes and PCB Alarm Figures and Tables
[HPID6 and HPID10]

[HPID16]
Fuse CF3
(250V 3A)

Main
PCB

Fuse CF1
(250V T30A)

Main
PCB

0Ω
Fuse CF4
(250V 3A)

Fuse CF1
HPID6 : 250V 15A
HPID10 : 250V 25A

Fuse CF3
(250V 3A)

0Ω

Figure 11-3: Continuity of current Fuse on the Main PCB
[HPID6 and HPID10]
Fan motor (HPID6 and HPID10)
Measure voltage between the connector pins of connector 18 .
Connector 18 shall be checked during heating operation.
Measure voltage as follows without taking off the connector 18 .

Fuse CF7
(250V T3.15A)

LOWER Fan motor (HPID16)
Measure voltage between the connector pins of connector 11 .
Connector 11 shall be checked during heating operation.
Measure voltage as follows without taking off the connector 11 .
UPPER Fan motor (HPID16)
Measure voltage between the connector pins of connector 14 .
Connector 14 shall be checked during heating operation.
Measure voltage as follows without taking off the connector 14 .
Between red
and black , approx. DC200~370V
Between yellow
and black , approx. DC3~7V Main PCB is normal
Between white
and black , approx. DC15V

[HPID16]

LOWER:
Fuse CF6
UPPER:
Fuse CF7
(250V T3.15A)

Fan motor

0Ω

Main
PCB
Main
PCB

Fan motor
BL Y W B R

Figure 11-4: Voltage of Fan motor on the Main PCB

Fuse CF6
HPID6: 250V 15A
HPID10: 250V 25A

Main
PCB

Figure 11-5: Continuity of current Fuse on the Main PCB

Section 11: Fault Finding

Page 57

Pump (HPID6 and HPID10)
Measure voltage between the connector pins of connector 17 .
Connector 17 shall be checked during heating operation.
Measure voltage as follows without taking off the connector 17 .
Pump (HPID16)
Measure voltage between the connector pins of connector 13 .
Connector 13 shall be checked during heating operation.
Measure voltage as follows without taking off the connector 13 .
Between white
and black
Between brown
and black
Between red
and black ,approx. DC15V

Main PCB is normal
[HPID16]

[HPID6 and HPID10]
Pump

Pump

W
B
R
BR
BL

17
Main
PCB
Fuse CF2
(250V T3.15A)

Main
PCB

Fuse CF2
(250V T5A)

0Ω

Figure 11-6: Voltage of pump on the Main PCB
Take off the connector and check the resistance 4way valve coil.
[HPID16]

[HPID6 and HPID10]

4way valve coil

Main
(PCB

10
Main
PCB

OHR

4-way valve coil

Figure 11-7: Resistance of the 4way valve coil
[HPID16]

[HPID6 and HPID10]
Defrost heater

11
Main
PCB

Main

260~300Ω

9 PCB

Figure 11-8: Resistance of the defrost heater

[0639U,1039U]
PCB
(Main)

0Ω

Figure 11-10: Resistance of the compressor overheat protection
relay

Humidity
Sensor
18 COM

[1639U]

PCB
(Main)

0.147~9.80V

Fuse CF2
0639U : 250V T3.15A
1039U : 250V T3.15A
Fuse CF2
(250V T5A)
Figure 11-9: Continuity of current fuse on the Main PCB

Page 58

Figure 11-11: Voltage of humidity sensor

Section 11: Fault Finding

Table 11-12: Sensor, temperature outdoor (heat pump)
Temperature (°C)

Resistance (kΩ)

Table 11-15: Sensor, temperature flow and return circulating water
(heat pump)
Temperature (°C)

Resistance (kΩ)

7.0

4.9

8.2

3.5

6.7

2.5

5.5

4.6

3.8

3.2

Table 11-13: Sensor, temperature discharge (heat pump)

Table 11-16: Sensor, temperature outdoor (Terminal PCB)
Temperature (°C)

Resistance (kΩ)

-20

107

-15

-10

59
44

Temperature (°C)

Resistance (kΩ)

-5

100

6.4

8.0

6.5

5.3

4.3

3.6

Table 11-14: Sensor, temperature defrost/suction (heat pump)
Sensor temperature DHW tank/thermal store/mix water (Terminal
PCB)
Temperature (°C)

Resistance (kΩ)

8.3

6.9

5.7

4.8

4.1

3.4

Section 11: Fault Finding

Page 59

Page 60

42 F
55
58
60

11
A

57
24

12.1 Exploded Diagram - HPID6

12 Spare Parts

Section 12: Spare Parts

12.2 Spare Parts List - HPID6
Item

Description

Product code

Outlet grille

HPID927368

Front panel assembly

HPID885766

Right side panel

HPID883774

Left side panel assembly

HPID883741

Top panel

HPID884558

Propeller fan

HPID922330

Motor

HPID937022

Bracket (motor)

HPID937023

Sensor (temperature outdoor)

HPID883780

Bottom panel assembly (without heater)

HPID883759

Wiring lid assembly

HPID937262

Condenser assembly

HPID883743

Coil (expansion valve)

HPID937196

Expansion valve

HPID922928

Sensor (temperature defrost)

HPID937014

Heat exchanger assembly

HPID883744

Pump assembly

HPID885394

Compressor

HPID937199

Vibration proof rubber

HPID883782

Sensor (temperature discharge/suction)

HPID937013

Sensor (temperature water)

HPID937193

Reactor

HPID927200

Terminal block

HPID885263

Terminal PCB

HPID885254

Main PCB

HPID885392

Rubber hose (for relief valve)

HPID883784

Sound proof material 1

HPID883791

Sound proof material 2

HPID883792

Sound proof material 3

HPID883793

Sound proof material 4

HPID883794

Sound proof material 5

HPID883795

Outdoor themistor holder

HPID937016

Coil - 4-way valve

HPID883796

Relief valve

HPID883798

Air purge valve

HPID885266

4-way valve

HPID927359

Circulating water flow port assembly

HPID884560

Circulating water return port assembly

HPID883778

Rubber hose 1

HPID883786

Rubber hose 8

HPID884561

Rubber hose 3

HPID885396

Rubber hose 4

HPID885397

Rubber hose 6

HPID883790

O-ring (P3)

HPID807209

O-ring (P4)

HPID807207

O-ring (P12.5)

HPID808972

O-ring (P14)

HPID910164

Section 12: Spare Parts

Item

Description

Product code

Quick fastener (for sensor temperature
water)

HPID883848

Quick fastener (12.7)

HPID790706

Hose band A

HPID937221

Hose band B

HPID927535

Hose band C

HPID934914

Drain plug

HPID885519

Circulating water connection coupling

HPID885395

Case of PCB

HPID883847

Case of PCB (cover)

HPID885393

Defrost heater

HPID884211

Defrost heater holder 1

HPID884212

Defrost heater holder 2

HPID884213

Power transformer

HPID885264

Controller PCB

HPID885765

Fin guard

HPID885782

Page 61

Page 62

13
E

C H
12

17 23

52
57

60
30

49 33

12.3 Exploded Diagram - HPID10

Section 12: Spare Parts

12.4 Spare Parts List - HPID10
Item

Description

Product code

Item

Description

Product code

Outlet grille

HPID938106

Air purge valve

HPID885266

Front panel assembly (left)

HPID885767

O-ring (P3)

HPID807209

Front panel assembly (right)

HPID885768

O-ring (P4)

HPID807207

Top panel assembly

HPID885504

O-ring (P6)

HPID807205

Propeller fan

HPID934945

O-ring (P12.5)

HPID808972

Motor

HPID885510

O-ring (P14)

HPID910164

Bracket (motor)

HPID934947

O-ring (P16)

HPID807213

Wiring lid

HPID885507

O-ring (P22)

HPID922856

Back panel assembly

HPID885769

Quick fastener

HPID761569

Bottom panel assembly (without heater)

HPID885506

Quick fastener (12.7)

HPID790706

Condenser assembly

HPID883634

Quick fastener (16A)

HPID963516

Expansion valve

HPID885511

Quick fastener (16B)

HPID884148

Coil (expansion valve)

HPID884119

Quick fastener (sensor temperature water)

HPID883848

4-way valve

HPID938113

Terminal PCB

HPID885254

Coil (4-way valve)

HPID883796

Controller PCB

HPID885765

Sensor (temperature discharge and suction)

HPID937013

Power transformer

HPID885264

Sensor (temperature circulating water)

HPID885265

Defrost heater

HPID885508

Sensor (temperature defrost)

HPID937014

Defrost heater holder 1

HPID884163

Sensor (temperature outdoor)

HPID883780

Defrost heater holder 2

HPID884132

Outdoor thermistor holder

HPID937016

Fin guard

HPID885781

Heat exchanger assembly

HPID885509

Pump assembly

HPID885512

Circulating water pipe assembly

HPID885513

Circulating water return port

HPID885514

Bypass pipe assembly

HPID885515

Drain plug

HPID885519

Hose coupling 1 assembly (pump inlet)

HPID885516

Hose coupling 2 assembly (pump outlet)

HPID885271

Hose coupling 3 (heat exchanger)

HPID885272

Rubber hose (pump inlet water)

HPID885273

Rubber hose (pump outlet water)

HPID885517

Rubber hose (for relief valve)

HPID885520

Hose band

HPID937221

Compressor

HPID934944

Vibration proof rubber

HPID934959

Reactor

HPID885259

Terminal block

HPID885263

Case of PCB (cover)

HPID885393

Main PCB

HPID885501

Case of PCB

HPID883847

Sound proof material 1

HPID883882

Sound proof material 2

HPID883883

Sound proof material 3

HPID883884

Sound proof material 4

HPID883885

Sound proof material 5

HPID884582

Sound proof material 6

HPID885518

Relief valve

HPID883798

Section 12: Spare Parts

Page 63

Page 64

24
K

R 42

K
L

36 41
R

34 46
28

12.5 Exploded Diagram - HPID16

Section 12: Spare Parts

12.6 Spare Parts List - HPID16
Item

Description

Product code

Item

Description

Product code

Front panel assembly (left)

HPID885255

O-ring (P14)

HPID910164

Outlet grille

HPID938106

O-ring (P16)

HPID807213

Front panel assembly (right)

HPID885770

O-ring (P22)

HPID922856

Top panel assembly

HPID884552

Sound proof material 1

HPID884142

Back panel assembly (right)

HPID885257

Sound proof material 2

HPID884143

Wiring lid

HPID884129

Sound proof material 3

HPID885276

Back panel (left)

HPID884126

Sound proof material 4

HPID885277

Bottom panel assembly (without heater)

HPID885258

Drain elbow

HPID881618

Reactor

HPID885259

Controller PCB

HPID885765

Motor

HPID885260

Terminal PCB

HPID885254

Bracket (motor)

HPID885261

Power transformer

HPID885264

Propeller fan

HPID938112

Defrost heater

HPID884130

Main PCB assembly

HPID885252

Defrost heater holder 1

HPID884131

Terminal block

HPID885263

Defrost heater holder 2

HPID884132

Coil (4-way valve)

HPID883796

Rubber hose

HPID885275

Coil (expansion valve)

HPID884119

Hose band

HPID934914

Sensor (temperature defrost)

HPID937014

Fin guard - back

HPID885779

Sensor (temperature discharge and suction)

HPID884139

Fin guard - side

HPID885780

Sensor (temperature outdoor)

HPID884140

Sensor (temperature water)

HPID885265

Compressor

HPID884116

Vibration proof rubber

HPID884135

Condenser assembly

HPID884136

4-way valve

HPID884117

High pressure switch

HPID884120

Expansion valve

HPID884118

Circulating water pipe assembly

HPID885267

Pump assembly

HPID885268

Heat exchanger assembly

HPID885262

Drain plug

HPID885519

Relief valve

HPID883798

Air purge valve

HPID885266

Quick fastener (12.7)

HPID790706

Quick fastener (16A)

HPID963516

Quick fastener (16B)

HPID884148

Quick fastener (sensor temperature water)

HPID883848

Circulating water return port

HPID885269

Hose coupling 1 assembly (pump input)

HPID885270

Hose coupling 2 (pump outlet)

HPID885271

Hose coupling 3 (heat exchanger)

HPID885272

Rubber hose (pump input)

HPID885273

Rubber hose (pump outlet)

HPID885274

Rubber hose (relief valve)

HPID934970

Hose band

HPID937221

O-ring (P3)

HPID807209

O-ring (P4)

HPID807207

O-ring (P12.5)

HPID808972

Section 12: Spare Parts

Page 65

13 EC Declaration of Conformity
This declaration is made under the sole responsibility of the following Manufacturer.
The Manufacturer declares that the following Products conform to the requirements of EU Directives, Regulations and Harmonized Standards as
below stated.
The Technical Construction Files are retained at the following Manufacturer’s location.
Product:
Model:

Air to Water Heat Pump
GRANT AERONA³ HPID6
GRANT AERONA³ HPID10
GRANT AERONA³ HPID16

Low Voltage Directive:
2014/35/EU
Machinery Directive:
2006/42/EC
EN 60335-2-40 : 2003, +All: 2004, +Al2: 2005, +Al: 2006, +A2: 2009, +Al3: 2012
EN 60335-1 : 2012, +All: 2014
EN 62233 : 2008
EMC Directive:
2014/30/EU
EN 61000-6-1 : 2007
EN 61000-6-3 : 2007, +A1:2001
Ecodesign Directive:
2009/125/EC [Space heaters and combination heaters: 811/2013; 813/2013]
EN 14511-3 : 2013
EN 14825 : 2013
EN 12102 : 2013
EN 16147 : 2011
BS EN ISO 3743-1 : 2010
RoHS Directive:
2011/65/EU
EN 50581 : 2012
Place of issue:

United Kingdom

Date of issue:

22nd March 2016

Authorised Signatory:

Neil Sawers - Technical Manager

Page 66

Section 13: EC Declaration of Conformity

14 Health and Safety Information
14.1 General

14.2 Refrigerant (R410A)

Under the Consumer Protection Act 1987 and Section 6 of the Health
and Safety at Work Act 1974, we are required to provide information
on substances hazardous to health (COSHH Regulations 1988).

The refrigerant is hermetically sealed within the heat pump.

Adhesives, sealants and paints used in the manufacture of the
product are cured and present no known hazards when used in the
manner for which they are intended.

WARNING

Isolate the heat pump from the electricity supply before removing any covers.

Work involving the refrigerant must only be performed by a qualified
F-Gas Engineer or an authorised dealer with a refrigerant handling
certificate.
Under no circumstances should the refrigerant be vented or
otherwise released to the atmosphere.
14.2.1 First Aid Measures
Inhalation
In low concentrations may cause narcotic effects. Symptoms may
include dizziness, headache, nausea and loss of co-ordination.
In high concentrations may cause asphy xiation. Symptoms may
include loss of mobility/consciousness. Victim may not be aware of
asphy xiation.
Remove victim to uncontaminated area wearing self contained
breathing apparatus. Keep victim warm and rested. Seek urgent
medical advice.
Apply artificial respiration if breathing stopped.
Skin/eye contact
In case of frostbite spray with water for at least 15 minutes. Apply a
sterile dressing.
Immediately flush eyes thoroughly with water for at least 15 minutes.
Remove contaminated clothing. Drench affected area with water for
at least 15 minutes.
Obtain medical assistance
Ingestion
Ingestion is not considered a potential route of exposure.

15 Disposal and Recycling
General
Grant UK air source heat pumps incorporate components
manufactured from a variety of different materials. However, most of
these materials cannot be recycled as they are contaminated by the
refrigerant and oil used in the heat pump.
Disassembly
This product may only be disassembled by a suitably qualified
(F-gas) refrigeration engineer.
Under no circumstances should the refrigerant be released into the
atmosphere.

Section 14: Health and Safety Information

Recycling
In order for the heat pump to be recycled or disposed of it must be
taken to a suitably licensed waste facility. You will need to contact a
qualified refrigeration engineer to do this for you.
Disposal
The refrigerant will be removed and returned to the refrigerant
manufacturer for recycling or disposal.
The complete heat pump unit, including the compressor and the oil
contained within it, must be disposed of at a licensed waste facility,
as it still remains contaminated by the refrigerant.

Page 67

16 Guarantee
You are now the proud owner of an Air Source Heat Pump from Grant
Engineering (UK) Limited which has been designed to give years of
reliable, trouble free, operation.
Grant Engineering (UK) Limited guarantees the manufacture of the
heat pump including all electrical and mechanical components for a
period of twelve months from the date of installation4, provided that
the air source heat pump has been installed in full accordance with
the installation and servicing instructions issued.
This will be extended to a total period of two years if the air source
heat pump is registered with Grant Engineering (UK) Limited within
thirty days of installation4 and it is serviced at twelve monthly
intervals3. See main Terms and Conditions below.
Registering the product with Grant Engineering (UK) Limited
Please register your air source heat pump with Grant Engineering
(UK) Limited within thirty days of installation. To do so visit w w w.
grantuk.com and follow the links to the ‘Homeowners Zone’, where
you can register your boiler for a further twelve months guarantee
(giving two years from the date of installation). This does not affect
your statutory rights1.
If a fault or defect occurs within the manufacturer’s guarantee
period
If your air source heat pump should fail within the guarantee period,
you must contact Grant Engineering (UK) Limited, who will arrange
for the repair under the terms of the guarantee, providing that the
heat pump has been correctly installed, commissioned and serviced
(if the appliance has been installed for more than twelve months) by
a competent person and the fault is not due to tampering, system
water contamination, misuse, trapped air or the failure of any external
components not supplied by Grant Engineering (UK) Limited, e.g.
pipework, etc.
This two year guarantee only applies if the air source heat pump is
registered with Grant Engineering (UK) Limited within thirty days of
installation4 and is serviced after twelve months3.
In the first instance
Contact your installer or commissioning engineer to ensure that
the fault does not lie with the system components or any incorrect
setting of the system controls that falls outside of the manufacturer’s
guarantee otherwise a service charge could result. Grant Engineering
(UK) Limited will not be liable for any charges arising from this
process.
If a fault covered by the manufacturer’s guarantee is found
Ask your installer to contact Grant Engineering (UK) Limited Service
Department on +44 (0)1380 736920 who will arrange for a competent
service engineer to attend to the fault.
Remember - before you contact Grant Engineering (UK) Limited:
Ensure the air source heat pump has been installed,
commissioned and serviced by a competent person in
accordance with the installation and servicing instructions.
• Ensure the problem is not being caused by the heating system or
its controls.

•

Page 68

Free of charge repairs
During the two year guarantee period no charge for parts or
labour will be made, provided that the air source heat pump has
been installed and commissioned correctly in accordance with the
manufacturer’s installation and servicing instructions, it was registered
with Grant Engineering (UK) Limited within thirty days of installation4
and, for air source heat pumps over twelve months old, details of
annual service is available3.
The following documents must be made available to Grant
Engineering (UK) Limited on request:
• Proof of purchase
• Commissioning Report Form
• Service documents
• System Design Criteria
Chargeable repairs
A charge may be made (if necessary following testing of parts) if the
cause of the breakdown is due to any fault(s) caused by the plumbing
or heating system, e.g. contamination of parts due to system
contamination, sludge, scale, debris or trapped air. See ‘Extent of
manufacturer’s guarantee’ below.
Ex tent of manufacturer’s guarantee:
The manufacturer’s guarantee does not cover the following:
• If the air source heat pump has been installed for over two years.
• If the air source heat pump has not been installed,
commissioned, or serviced by a competent person in
accordance with the installation and servicing instructions.
• The serial number has been removed or made illegible.
• Fault(s) due to accidental damage, tampering, unauthorised
adjustment, neglect, misuse or operating the air source heat
pump contrary to the manufacturer’s installation and servicing
instructions.
• Damage due to external causes such as bad weather conditions
(flood, storms, lightning), fire, explosion, accident or theft.
• Fault(s) due to incorrectly sized expansion vessel(s), incorrect
vessel charge pressure or inadequate expansion on the system.
• Fault(s) caused by external electrics and external components
not supplied by Grant Engineering (UK) Limited.
• Air source heat pump servicing, de-scaling or flushing.
• Checking and replenishing system pressure.
• Electrical cables and plugs, external controls not supplied by
Grant Engineering (UK) Limited.
• Heating system components, such as radiators, pipes, fittings,
pumps and valves not supplied by Grant Engineering (UK)
Limited.
• Instances where the heat pump has been un-installed and reinstalled in another location.
• Use of spare parts not authorised by Grant Engineering (UK)
Limited.
• Consumable items including, but not limited to, antifreeze and
biocide inhibitor.

Section 15: Guarantee

Terms of manufacturer’s guarantee:
• The Company shall mean Grant Engineering (UK) Limited.
• The heat pump must be installed by a competent installer and in
full accordance with the relevant Codes of Practice, Regulations
and Legislation in force at the time of installation.
• The heat pump is guaranteed for two years from the date of
installation4, providing that after twelve months the annual
service has been completed3 and the heat pump registered with
the Company within thirty days of the installation date4. Any work
undertaken must be authorised by the Company and carried out
by a competent service engineer.
• The internal heat exchanger of the heat pump is also covered
by a two year parts and labour guarantee from the date of
installation4. This is subject to the following:
• The heat pump is operated correctly, in accordance with the
installation and servicing instructions.
• Proof is provided that the system has been flushed or
chemically cleaned where appropriate (refer to BS 7593)
and that the required quantity of a suitable corrosion
inhibitor added.
• Proof of annual servicing (including the checking of any
expansion vessels and pressure relief valves) must be
provided if and when requested by the Company.
IMPORTANT
Grant Engineering (UK) Limited strongly recommends that a
Grant MagOne in-line magnetic filter/s (or equivalent5) is fitted
in the heating system pipework. This should be installed and
regularly serviced in accordance with the filter manufacturer’s
instructions.
• This guarantee does not cover breakdowns caused by incorrect
installation, neglect, misuse, accident or failure to operate the
heat pump in accordance with the manufacturer’s installation and
servicing instructions.
• The heat pump is registered with the Company within thirty days
of installation. Failure to do so does not affect your statutory
rights1.
• The balance of the guarantee is transferable providing the
installation is serviced prior to the dwelling’s new owners taking
up residence. Grant Engineering (UK) Limited must be informed
of the new owner’s details.
• The Company will endeavour to provide prompt service in
the unlikely event of a problem occurring, but cannot be held
responsible for any consequences of delay however caused.
• This guarantee applies to Grant Engineering (UK) Limited
air source heat pumps purchased and installed on the UK
mainland, Isle of Wight, Channel Islands and Scottish Isles only2.
Provision of in-guarantee cover elsewhere in the UK is subject to
agreement with the Company.
• All claims under this guarantee must be made to the Company
prior to any work being undertaken. Invoices for call out/repair
work by any third party will not be accepted unless previously
authorised by the Company.
• Proof of purchase and date of installation, commissioning and
service documents must be provided on request.
• If a replacement heat pump is supplied under the guarantee (due
to a manufacturing fault) the product guarantee continues from
the installation date of the original heat pump, and not from the
installation date of the replacement4.
• The replacement of a heat pump under this guarantee does not
include any consequential costs.

Section 15: Guarantee

Foot notes:
1. Your statutory rights entitle you to a one year guarantee period
only.
2. The UK mainland consists of England, Scotland and Wales only.
Please note that for the purposes of this definition, Northern
Ireland, Isle of Man and Scilly Isles are not considered part of the
UK mainland.
3. We recommend that your air source heat pump is serviced every
twelve months (even when the guarantee has expired) to prolong
the lifespan and ensure it is operating safely and efficiently.
4. The guarantee period will commence from the date of installation,
unless the installation date is more than six months from the date
of purchase, in which case the guarantee period will commence
six months from the date of purchase.
5. As measured by gauss. The MagOne magnetic filter has a Gauss
measurement of 12000.

Version 1.0

Page 69

Appendix A
ErP product fiche and energy label
While it is the manufacturer’s responsibility to issue their products with the required energy labels, it is the installer’s responsibility to issue a
‘combination’ product fiche and energy label to the end user/householder, i.e. when a heat pump and cylinder are installed together.
All ‘combination’ product fiches and energy labels can be downloaded from w w w.grantuk.com. Refer to the table below to ensure you are
issuing the correct product fiche and energy label.

Heat pump model

HPID6

HPID10

HPID16

Page 70

Cylinder model

Combination
Product fiche

Energy label

HPMONOA/IND200

HPID6 and HPMONOA/IND200 product fiche

HPID6 and HPMONOA/IND200 energy label

HPMONO/IND125

HPID6 and HPMONO/IND125 product fiche

HPID6 and HPMONO/IND125 energy label

HPMONO/IND150

HPID6 and HPMONO/IND150 product fiche

HPID6 and HPMONO/IND150 energy label

HPMONO/IND170

HPID6 and HPMONO/IND170 product fiche

HPID6 and HPMONO/IND170 energy label

HPMONO/IND200

HPID6 and HPMONO/IND200 product fiche

HPID6 and HPMONO/IND200 energy label

HPMONO/IND250

HPID6 and HPMONO/IND250 product fiche

HPID6 and HPMONO/IND250 energy label

HPMONO/IND300

HPID6 and HPMONO/IND300 product fiche

HPID6 and HPMONO/IND300 energy label

HPMONO/IND400

HPID6 and HPMONO/IND400 product fiche

HPID6 and HPMONO/IND400 energy label

HPDUO/IND170

HPID6 and HPDUO/IND170 product fiche

HPID6 and HPDUO/IND170 energy label

HPDUO/IND200

HPID6 and HPDUO/IND200 product fiche

HPID6 and HPDUO/IND200 energy label

HPDUO/IND250

HPID6 and HPDUO/IND250 product fiche

HPID6 and HPDUO/IND250 energy label

HPDUO/IND300

HPID6 and HPDUO/IND300 product fiche

HPID6 and HPDUO/IND300 energy label

HPDUO/IND400

HPID6 and HPDUO/IND400 product fiche

HPID6 and HPDUO/IND400 energy label

HPMONOA/IND200

HPID10 and HPMONOA/IND200 product fiche

HPID10 and HPMONOA/IND200 energy label

HPMONO/IND125

HPID10 and HPMONO/IND125 product fiche

HPID10 and HPMONO/IND125 energy label

HPMONO/IND150

HPID10 and HPMONO/IND150 product fiche

HPID10 and HPMONO/IND150 energy label

HPMONO/IND170

HPID10 and HPMONO/IND170 product fiche

HPID10 and HPMONO/IND170 energy label

HPMONO/IND200

HPID10 and HPMONO/IND200 product fiche

HPID10 and HPMONO/IND200 energy label

HPMONO/IND250

HPID10 and HPMONO/IND250 product fiche

HPID10 and HPMONO/IND250 energy label

HPMONO/IND300

HPID10 and HPMONO/IND300 product fiche

HPID10 and HPMONO/IND300 energy label

HPMONO/IND400

HPID10 and HPMONO/IND400 product fiche

HPID10 and HPMONO/IND400 energy label

HPDUO/IND170

HPID10 and HPDUO/IND170 product fiche

HPID10 and HPDUO/IND170 energy label

HPDUO/IND200

HPID10 and HPDUO/IND200 product fiche

HPID10 and HPDUO/IND200 energy label

HPDUO/IND250

HPID10 and HPDUO/IND250 product fiche

HPID10 and HPDUO/IND250 energy label

HPDUO/IND300

HPID10 and HPDUO/IND300 product fiche

HPID10 and HPDUO/IND300 energy label

HPDUO/IND400

HPID10 and HPDUO/IND400 product fiche

HPID10 and HPDUO/IND400 energy label

HPMONOA/IND200

HPID16 and HPMONOA/IND200 product fiche

HPID16 and HPMONOA/IND200 energy label

HPMONO/IND125

HPID16 and HPMONO/IND125 product fiche

HPID16 and HPMONO/IND125 energy label

HPMONO/IND150

HPID16 and HPMONO/IND150 product fiche

HPID16 and HPMONO/IND150 energy label

HPMONO/IND170

HPID16 and HPMONO/IND170 product fiche

HPID16 and HPMONO/IND170 energy label

HPMONO/IND200

HPID16 and HPMONO/IND200 product fiche

HPID16 and HPMONO/IND200 energy label

HPMONO/IND250

HPID16 and HPMONO/IND250 product fiche

HPID16 and HPMONO/IND250 energy label

HPMONO/IND300

HPID16 and HPMONO/IND300 product fiche

HPID16 and HPMONO/IND300 energy label

HPMONO/IND400

HPID16 and HPMONO/IND400 product fiche

HPID16 and HPMONO/IND400 energy label

HPDUO/IND170

HPID16 and HPDUO/IND170 product fiche

HPID16 and HPDUO/IND170 energy label

HPDUO/IND200

HPID16 and HPDUO/IND200 product fiche

HPID16 and HPDUO/IND200 energy label

HPDUO/IND250

HPID16 and HPDUO/IND250 product fiche

HPID16 and HPDUO/IND250 energy label

HPDUO/IND300

HPID16 and HPDUO/IND300 product fiche

HPID16 and HPDUO/IND300 energy label

HPDUO/IND400

HPID16 and HPDUO/IND400 product fiche

HPID16 and HPDUO/IND400 energy label

Appendix A

Notes

Page 71

GRANT ENGINEERING (UK) LIMITED
Hopton House, Hopton Industrial Estate, Devizes, Wiltshire, SN10 2EU
Tel: +44 (0)1380 736920 Fax: +44 (0)1380 736991
Email: info@grantuk.com www.grantuk.com

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