Baxi Ambiflo 75 Installation and user guide

Comp No 5132629 - Iss 2 - 7/09
Installation, Servicing & Maintenance Instructions

Ambiflo™ Heat Pump System
7kW to 10.5kW Inclusive
Air to Water Heat Pump
for
Outdoor Installation
Page 1
Safe Manual Handling
General
The following advice should be adhered to, from when first handling the Ambiflo™ Heat Pump Range to
the final stages of installation, and also during maintenance.
Most injuries as a result of inappropriate handling and lifting are to the back, but all other parts of the
body are vulnerable, particularly shoulders, arms and hands. Health & Safety is the responsibility of
EVERYONE.
This Baxi Ambiflo™ Heat Pump unit is not suitable for a one-man lift. Do not attempt to lift this unit
without the appropriate equipment and/or assistance.
Do not handle or lift unless you feel physically able.
Wear appropriate Personal Protection Equipment e.g. protective gloves, safety footwear etc.
Important: These instructions do not replace the separate instructions for individual components and
accessories, which should be read in conjunction with these instructions.
Preparation
Co-ordinate movements - know where, and when, you are both going.
Minimise the number of times needed to move the Ambiflo™ Heat Pump - plan ahead.
Always ensure when handling or lifting the route is clear and unobstructed. If possible avoid steps, wet or
slippery surfaces, unlit areas etc.
Technique
When handling or lifting always use safe techniques - keep your back straight, bend your knees. Don't
twist - move your feet, avoid bending forwards and sideways and keep the load as close to your body as
possible.

Where possible transport the Heat Pump / Ambiflo™ Parts using a sack truck or other suitable lifting
equipment.
Remember
The circumstances of each installation are different. Always assess the risks associated with handling and
lifting according to the individual conditions.
If at any time when installing Ambiflo™ Components you feel that you may have injured yourself STOP.
DO NOT 'work through' the pain - you may cause further injury.
IF IN ANY DOUBT DO NOT HANDLE OR LIFT AMBIFLO™ COMPONENTS -
OBTAIN ADVICE OR ASSISTANCE BEFORE PROCEEDING
CE Marking
This product is CE marked and conforms to the essential requirements of the following Directives:
- Low voltage no. 73/23 EEC, modified 93/68 EEC.
- Electromagnetic Compatibility no. 891336 EEC, modified 92/31 and 93/68 EEC.
Electrical equipment is in accordance with standard EN 60 335-2-40
The following standards and directives should also be considered when installing this unit.
Current Wiring Redulations BS 7671
HVAC TR/30 Guide to good practice - Heat pumps
BS EN 15450: 2007 Heating systems in buildings - Design of heat pump heating systems
EC Regulation No 842/2006 on certain fluorinated greenhouse gases: Supplementary guidance
for stationary refrigeration air conditioning and heat pumps
© Baxi Heating UK Ltd 2009 All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means,
or stored in any retrieval system of any nature (including in any database), in each case whether electronic, mechanical, recording or otherwise,
without the prior written permission of the copyright owner, except for permitted fair dealing under Copyrights, Designs and Patents Act 1988.
Applications for the copyright owner's permission to reproduce or make other use of any part of this publication should be made, giving details of
the proposed use, to the following address:
The Company Secretary, Baxi Heating UK Ltd, The Wyvern Business Park, Stanier Way, Derby, DE21 6BF.
Full acknowledgement of author and source must be given.
WARNING: Any person who does any unauthorised act in relation to a copyright work may be liable to criminal prosecution and civil claims for
damages.

Legislation
Information regarding the refrigerant used in this appliance (R410A)
NOTE: Any work requiring access to the refrigerant circuit must only be carried out by a refrigerant
competent engineer.
R 410 A is a high-pressure refrigerant (+ 50% in relation to R 22 and R 407 C). Compressors approved
for operation with this fluid are filled beforehand with polyalcohol oil.
Contrary to mineral oil, it is very hygroscopic: it absorbs the humidity of the ambient air very quickly.
This can modify its lubricant properties and will lead to serious damage to the compressor. Refrigerant
material can be hazardous.
Contact Baxi Technical Enquiries 0844 871 1568 for further information.
Maintenance Instructions
1. Never add oil to the appliance; the compressor is filled with polyalcohol oil, a special oil which cannot
tolerate the presence of other oils.
2. Instruments used for the following:
- filling,
- pressure measurements,
- emptying under vacuum,
- recovering the fluid,
must be compatible with and only used for R410A fluid.
NOTE: the pressure taps of the refrigerating circuit are 5/16 SAE (112-20- UNF)
3. In the case of a new charge:
- the charge must be undertaken in liquid phase,
- use a balance and a dip pipe type R 410A cylinder,

- charge the weight of R410A as per the value indicated on the unit's identification plate.
4. In case of leakage, do not complete the charge: recover the remaining refrigerant for recycling and
perform a total charge. Recovery, recycling or the destruction of the fluid must be done in compliance
with the laws in force in the country concerned.
5. If the refrigerant circuit is opened, you must:
- avoid the entry of air into the circuit as much as possible,
- replace or install a drier,
- perform the "vacuum operation" at a minimum level of 0.3 mbar (static).
Page 2
In order to reduce the number of fatalities and major accidents attributable to working at height, the
Health and Safety Executive has introduced comprehensive regulations and guidance that should be
followed by all businesses working at height.
We consider in the following paragraphs some of the main features of the regulations and guidance. This
is, however, only a limited summary and it is recommended that all businesses planning on undertaking
air source heat pump heating installations obtain a copy of the regulations and guidance issued by the
Health and Safety Executive and carefully consider the contents.
The regulations and guidance state that you are required to carry out a risk assessment for all work
conducted at height and to put in place arrangements for:
●Eliminating or minimising risks from work at height.
●Safe systems of work for organising and performing work at height.
●Safe systems for selecting suitable work equipment.
●Safe systems for protecting people from the consequences of work at height.
The regulations and guidance highlight a hierarchy for safe work at height:
●Avoid the risk by not working at height if practicable.
●Prevent falls. Where it is not reasonably practicable to avoid work at height, you are required to
take suitable and sufficient steps to prevent the risk of a fall including selecting the most suitable
work equipment (in accordance with the regulations).
●Mitigate the consequences of a fall; where the risk of a person or object falling still remains, take
suitable and sufficient measures to minimise the distance and consequences of any fall.
Collective protection measures, such as guard rails on scaffold, should be given priority over personal
protection measures, such as safety harnesses.
Within the regulations' framework, you are required to:
1) Assess the risk to help you decide how to work safely.
2) Follow the hierarchy for safe work at height (i.e. avoid, prevent and mitigate).

3) Plan and organise your work properly, taking account of weather conditions and the possibility of
emergencies.
4) Make sure those working at height are competent.
5) Make use of appropriate work equipment.
6) Manage the risks from working on or around fragile surfaces and from falling objects.
7) Inspect and maintain the work equipment to be used and inspect the place where the work will be
carried out for both access and egress.
When preparing to install an air source heat pump heating system, it is required that you perform a risk
assessment in relation to work at height and plan how you will organise your work, taking into account
the site, the weather conditions and the experience and competence of colleagues or contractors who may
be working at height with you.
Health & Safety Information
The HSE has published a number of very useful free publications that advise how to undertake risk
assessments.
Two of these that you should obtain are:
Five Steps to Risk Assessment.
A Guide to Risk Assessment Requirements.
The five steps outlined in the HSE leaflet are:
Step 1: Look for the hazards
This will mean looking at the site and identifying significant hazards. For example, avoid fragile surfaces
and hazardous areas where the Heat Pump may be mounted. Do not work on uneven ground and avoid
obstructions where access to the Heat Pump may be required. Always fix ladders and platforms securely
before commencing work.
Step 2: Decide who may be harmed and how.
This might mean considering the particular risks that young workers or trainees might face and thinking
about the residents of the household or visitors who could be hurt by your activities.
Step 3: Evaluate the risks and decide which precautions should be made. You should consider how likely
it is that each hazard will cause harm, decide which precautions you might take and then assess, after
you have taken those precautions, whether the remaining risk will be high, medium or low. Where you
identify remaining risks, you should consider which further action you could take to control the risks so
that harm is unlikely.
Step 4: Record your findings

If you have fewer than five employees you do not need to write anything down, though it is useful to
keep a written record of what you have done. If you employ five or more people you must record the
significant findings of your assessment. You must also tell your employees about your findings. You need
to be able to show that a proper check was made, that you considered who might be affected, that you
dealt with all the obvious significant hazards, that the precautions you propose are reasonable and that the
remaining risk is low.
Step 5: Review your assessment if necessary
Each air source heat pump heating installation may bring its own challenges and present its own
particular hazards. You should therefore be careful not to rely on a "standard" risk assessment for
installing an air source heat pump heating system in a house, but review the particular hazards for each
new situation. The issue of work equipment must be considered, but at the preparation stage you should
consider where scaffold or other access equipment might be positioned and look out for any obvious
obstacles to this, such as a conservatory or porch.
In addition to the risks associated with work at height, you should also consider the risks associated
with moving the air source heat pump into position, using electric drills and using blow lamps or blow
torches for soldering. This is not an exclusive list and so you should consider all aspects of the proposed
installation to assess whether there are additional risks that need to be taken into account.
Page 3
Kit Contents
Your Ambiflo™ Heat Pump pack contains the following items.
Ambiflo™
75 plus
heater pack
Ambiflo™
90 plus
heater pack
Ambiflo™
105 plus
heater pack
Ambiflo™
75 plus
buffer
pack
Ambiflo™
90 plus
buffer
pack
Ambiflo™
105 plus
buffer pack
Code number 5131492 5131493 5131494 5131495 5131533 5131534
Ambiflo™ 75
Ambiflo™ 90
Ambiflo™ 105
Electric heater 5kW*

Water temperature sensor
Connections kit ¾"
Flexible hoses ¾"
Connections kit 1"
Flexible hoses 1"
Direct buffer vessel 100
litres
Balancing valve
Literature pack
* The 5kW Electrical heater is supplied complete with the Aquaset controller, outdoor sensor and water
temperature sensor (fitted).
Fig. 1
1. The Baxi Ambiflo™ system includes a one year parts and labour guarantee. The buffer vessel, where
fitted, comes with a 2 year parts warranty. The cylinder's stainless shell has a 25 year warranty.
2. The labour guarantee is subject to the installation and commissioning of the unit being carried out in
accordance with the manufacturer's instructions.
3. In accordance with building regulations, installation must by carried out by an installer who has
successfully completed the Baxi Ambiflo™ training course.
4. Baxi offer a set up and test service for this product. This can be arranged by telephoning 0844 871
1568 to book the visit. Further details regarding commissioning can be found in the Commissioning
booklet General Information section. We aim to process your request within 7 days of receipt.
IMPORTANT:- The terms of the Baxi Ambiflo™ warranty require the installation is set up and checked
by one of our heateam engineers. This service is chargeable and can be arranged, via the telephone,
directly with heateam. Please have the serial number of the Baxi Ambiflo™ available when booking this
service.
The Baxi Ambiflo™ warranty is predicated on the completion of the following:-

a) Registration of the product with heateam
b) Installation by an individual who has successfully completed the Baxi Ambiflo™ training course
c) Completion of a suitable commissioning document which must be left on site for the end users records
d) Set up and check of the product by heateam or its approved agent
e) Use of a suitable dirt separator and / or use of a magnetic cleaning device on all applications
f) If necessary, provision of safe access by the homeowner or relevant organisation to any parts of the unit
mounted above two metres in accordance with the latest HSE Working at Height regulations
Page 4
ACCESSORIES
Description Part No
Electrical Heater 5kW
Module 5131502
Flexible Hose Kit 1" 5131507
Flexible Hose Kit ¾" 5131504
Current Limiter 5132431
230V Controls Relay
Board 5132432
Buffer 100 Litres 5131537
Buffer 35 Litres 5131503
Guard- Ambiflo™ 75 &
90 5134518
Guard - Ambiflo™ 105 5134519

Wall Mounted Brackets 5134517
Heater Module
Connection Kit ¾" 5131500
Heater Module
Connection Kit 1" 5131508
2 Circuit/1 Mixer
Module 5132426
2 Zone/2 Mixer Module 5132427
Remote Service Control
(WM) 5131497
Room Sensor 5132429
Outdoor Sensor 5131498
Dirt Separator 5133750
Ambilfo™ 75 5131535
Ambilfo™ 90 5131536
Ambilfo™ 105 5131501
CONTENTS
Section
Legislation
Health & Safety
Kit Contents
Accessories/Contents
1.0 Introduction
2.0 General Layout

3.0 System Hydraulics
4.0 Electrical
5.0 Installation
6.0 Technical Data
7.0 Service & Maintenance
This booklet contains information regarding the installation, service and maintenance of the Baxi
Ambiflo™ Heat Pump System. The following system components have their own independent instruction
booklets, which should be referred to as necessary.
1. Commissioning the Ambiflo™ Heat pump and system 2. Baxi Ambiflo™ 5kW Electrical heater
The User's instructions are also in a separate document and should be left with the householder for their
reference.
Fault finding and alarm error codes are contained within the commissioning booklet.
Page 5
1.0 Introduction
1.1 Supply Conditions
1. Please check all items and examine for damage. If damage has occurred please contact your merchant.
1.2 Recommendation
1. Prior to all servicing or other actions on the equipment, installation, commissioning, operation, or
maintenance, the personnel in charge of these operations must become familiar with these instructions
and recommendations provided in the installation manual.
2. The personnel responsible for receiving the unit must conduct a visual inspection in order to identify all
damage to which the unit may have been subjected during transport.
3. The unit must be installed, commissioned, maintained and repaired in accordance with the
manufacturer's instructions. All work must be carried out in compliance with the requirements of all
directives, laws and regulations and in accordance with standard trade practices.
4. The pipework contained in and around this unit contains fluids at high temperatures and pressures.
Under no circumstances should these pipes be used as a step as they may rupture and cause serious
damage or burns.
1.3 General Description
1. The Baxi Ambiflo™ air source heat pump is an outdoor heat only unit, intended for central heating. It
is a one-piece heat pump with closed and pre-charged refrigeration circuit.
2. The Baxi Ambiflo™ is available in a choice of three outputs: 7.5KW, 9.0KW and 10.5KW at typical
outside temperatures at 7°C and radiators at 45°C.

3. Each model is offered as part of System Packs containing heat pump, auxiliary 5KW electric heater,
flexible hoses, programmable room thermostat and outdoor sensor. The systems are purpose designed to
optimise comfort and efficiency. Room and outdoor temperature compensation is used to optimise flow
and return temperatures. The system also intelligently controls any operation of the 5kW electric heater
during defrost or extreme low outdoor temperature. Defrost is achieved efficiently by reverse cycle at the
refrigerator circuit.
4. IMPORTANT: Accurate sizing of the radiators is the responsibility of the installer. Please size
correctly for the lower average system temperature. Please do not oversize as this can lead to overheating
problems.
5. Baxi recommends that a high quality, low energy circulating pump is used in conjunction with this
system.
6. These units are 230V 50Hz single phase appliances. Before carrying out any operation, check that the
voltage indicated on the unit corresponds to the mains voltage.
7. This heat pump is intended solely for the heating of premises.
Page 6
8. A 100 amp incoming fuse to the property is recommended for installation. A current limiter is available
for applications where a 100 amp fuse is not available. Please refer to Section 4.0 for further details.
9. Certain applications may require the use of a relay box. Please refer to the Section 4.0 for further
details.
10. A buffer vessel may also be required. Please refer to Section 3.7 for details.
11. This unit is CE marked. However, a risk assessment MUST be carried out prior to installation
regarding access to the unit. Consideration should be given to safety (moving parts, electrical cable,
pipework, etc.) and security (vandalism, theft) with respect to the household and neighbourhood. Please
refer to Health and Safety Information Section for details of risk assessments.
12. Wall mounting brackets are available for this unit. Please see the accessories list for details.
NOTE: When considering wall mounting as a siting option please refer to the warranty terms and conditions
regarding servicing, maintenance and repair of the unit prior to doing so.
13. Noise level should also be considered when siting the unit. Your Local Authority may enforce a
maximum permissible noise level, measured at neighbouring properties. For information on calculation
maximum or permissible noise levels, please call Baxi on 0844 871 1568.
14. The anti-vibration pads and in-line strainer are supplied inside the heat pump front panel. Please
remove this installation kit prior to commencing work. Please refer to Fig. 2 for access to the kit.
15. A Dirt Separator is available as an accessory for this unit. This must be fitted on any water circuit
where radiators are used. Please refer to Figs. 6 and 7 (Section 3.5 and 3.6) for details. Failure to fit this
filter will affect your warranty.

1.4 Guarding
1. This unit contains electrical components and moving parts.
These components, and the surrounding system pipework, operate at high temperatures. Where young
children or animals are concerned, Baxi recommend a barrier or guard to avoid tampering. The guard
must be of a suitable design and not restrict the air flow through the unit. A risk assessment MUST be
carried out prior to installing the unit.
NOTE: A guard is available from Baxi as an accessory if required.
Part number 5134518 – Guard Ambiflo™ 75 & 90.
Part number 5134519 – Guard Ambiflo™ 105.
2. See Fig. 16 for the orientation of the guard and please refer to the separate instructions for fixing details
and clearances required.
Page 7
2.0 General Layout
2.1 Layout
The Baxi Ambiflo™ air source heat pump unit includes an integral circulation pump (3 speed to optimise
comfort and efficiency), small expansion vessel, pressure gauge and pressure relief valve. An additional
expansion vessel may be required.
1. Sound-proofed hermetic compressor.
2. Plate water heat exchanger.
3. "Plate-Fin" air heat exchanger.
4. Fan.
5. Fan protection grille.
6. Electrical box.
7. Baxi Ambiflo™ Heat Pump control unit.
8. Circulating pump.
9. Expansion tank.
10. Safety valve.
11. Pressure gauge.

12. Heat pump return (Inlet).
13. Heat pump flow (Outlet).
14. Filling / drainage of the water circuit.
15. Air vent.
16. Glands for mains cable inlet.
Fig. 2
Page 8

3.0 System Hydraulics
3.1 System Hydraulics
1. It is essential that the Baxi Ambiflo™ Heat Pump be installed correctly to the relevant system design
(Figs. 3 to 7). The installation must comply with one of the systems shown or the terms and conditions of
the warranty will be invalidated.
2. Please refer to the commissioning instructions supplied with this unit for the parameter settings for the
system diagrams shown.
3. Where radiators are used, the dirt separator must be fitted as shown in the hydraulic system diagrams
(see Figs. 6 and 7 for relevant system). Failure to do this will affect your warranty. Where the Baxi
Ambiflo™ Heat Pump is fitted to an existing system it is essential to power flush the system prior to
installing the unit and fitting the dirt separator.
4. Where Isolation Valves are used on the hydraulic system (Figs. 3 to 7) it is essential that these are full
bore valves to minimise the system resistance.
5. It is important that the internal bore of the pipework used between the Ambiflo™ Heat Pump and the
buffer is at least equal to, or ideally larger than the internal bore of the pipework supplied. This will allow
reduced pump speeds and help to minimise system running costs.
IMPORTANT: We do not recommend use of the Baxi Ambiflo™ with existing conventional radiators unless
it can be demonstrated that the heat output from these radiators at the lower average system temperature can
provide the necessary level of comfort (e.g. 20°C room) under load conditions (0°-3°C outside).
It is very important not to oversize the radiator system for maximum return temperatures of 45°C, as this can
result in room temperatures higher than required. If this is the case, then contact your installer to re-parameter
your maximum system water temperature to compensate.
We do not recommend the use of the Baxi Ambiflo™ for preheating domestic hot water using conventional
cylinders.
The Baxi Ambiflo™ heat pump is designed for average system temperatures between 25°C and 50°C.
Suitable heat emitters include:
- Low temperature panel radiators.
- Skirting radiators.
- Fan convector radiators.
- Underflow arrays.
- Oversize high temperature panel radiators.
Page 9

3.2 Residential System 'Ambiflo™ Heat pump & Heater module' 1 Zone floor
Note:
i) This is a diagrammatical representation of the underfloor air vent position. Please refer to the appropriate
instructions from the manifold supplier for details.
ii) Please refer to the manifold manufacturer? instructions regarding return water temperatures and use
parameter 30 to carry out any necessary adjustments.
iii) Please refer to the manifold manufacturer? instructions regarding flow rate of the underfloor system. Use
the hydraulic pump curve to give the correct value.
Fig. 3
Page 10
3.3 Residential System 'Ambiflo™ Heat pump & Heater module' Variant A - 1 Zone
floor

Note:
i) This is a diagrammatical representation of the underfloor air vent position. Please refer to the appropriate
instructions from the manifold supplier for details.
ii) Please refer to the manifold manufacturer#s instructions regarding return water temperatures and use
parameter 30 to carry out any necessary adjustments.
iii) Please refer to the manifold manufacturer#s instructions regarding flow rate of the underfloor system. Use
the hydraulic pump curve to give the correct value.
Fig. 4
Page 11
3.4 Residential System 'Ambiflo™ Heat pump & Heater module' 2 Zones floor

Note:
i) This is a diagrammatical representation of the underfloor air vent position. Please refer to the appropriate
instructions from the manifold supplier for details.
ii) Please refer to the manifold manufacturer#s instructions regarding return water temperatures and use
parameter 30 to carry out any necessary adjustments.
iii) Please refer to the manifold manufacturer#s instructions regarding flow rate of the underfloor system. Use
the hydraulic pump curve to give the correct value.
Fig. 5
Page 12
3.5 Residential System 'Ambiflo™ Heat pump & Heater module' 1 Zone floor + 1
Zone Radiator

Note:
i) This is a diagrammatical representation of the underfloor air vent position. Please refer to the appropriate
instructions from the manifold supplier for details.
ii) Please refer to the manifold manufacturer#s instructions regarding return water temperatures and use
parameter 30 to carry out any necessary adjustments.
iii) Please refer to the manifold manufacturer#s instructions regarding flow rate of the underfloor system. Use
the hydraulic pump curve to give the correct value.
Fig. 6
Page 13
3.6 Residential System 'Ambiflo™ Heat pump & Heater module' 1 Zone Radiators

Fig. 7
Page 14
3.7 Buffer Vessel
Comparison of 9kW system heat loss against time for various total volumes