Earth Save Products SOLIS 11 User manual

Dated 17/09/19 V1.2
ESP-HC-DHW 11DC
ESP-HC-DHW 17DC
Earth Save Products
SOLIS
Air Source Heat Pump
Installation
and User Manual

Dated 17/09/19 V1.2
ESP-HC-DHW 11DC
ESP-HC-DHW 17DC

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WARNING
READ THIS BEFORE INSTALLING THE UNIT.
The installation of all un-vented water heating systems above 15 litres MUST comply with local area
Building Regulations. It is a legal requirement that the local Building Control Officer be notified of any
proposed installation.
UK regulations require an appropriately sized expansion vessel (internal or external) to be incorporated,
safety devices to prevent the stored water exceeding 100°C, and pipe work to convey discharged hot water
safely away from the safety devices.
Furthermore, the installation must be carried out by an engineer who has successfully completed a recognised
course in the installation of un-vented heating systems such as CITB. Failure to fit the unit correctly and in
accordance with regulations may affect its safety, efficiency and WILL invalidate any guarantee.
THE UNIT MUST BE INSTALLED, COMMISSIONED AND MAINTAINED BY A COMPETENT
INSTALLER IN ACCORDANCE WITH BUILDING REGULATION G3 (ENGLAND AND WALES),
TECHNICAL STANDARD P3 (SCOTLAND) OR BUILDING REGULATION P5 (NORTHERN
IRELAND) AND THE WATER FITTING REGULATIONS (ENGLAND AND WALES) OR WATER
BYELAWS (SCOTLAND). FOLLOWING INSTALLATION AND COMMISSIONING, THE
OPERATION OF THE UNIT SHOULD BE EXPLAINED TO THE USER AND THESE INSTRUCTIONS
LEFT WITH THEM FOR FUTURE REFERENCE.

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Models: SOLIS 11 / 17
Contents list
1 General .................................................................................................................................................................... 5
2 System Description ............................................................................................................................................... 5
3 Installation ............................................................................................................................................................... 5
3.1 General points for installation engineer .................................................................................................. 5
3.1-1 Transport and storage .................................................................................................................... 5
3.1-2 Commissioning the installation ..................................................................................................... 6
3.1-3 Sitting the heat pump ..................................................................................................................... 6
3.1-4 Controller .......................................................................................................................................... 6
3.2 Installation design ....................................................................................................................................... 7
3.3 Pipe Connection ......................................................................................................................................... 7
3.4 Electrical Connection ............................................................................................................................... 10
3.4-1 Installation Drawings ..................................................................................................................... 11
3.4-2 Electrical Connection for all Solis Units…………………………………………………………….13
3.5 Commissioning ......................................................................................................................................... 16
3.5-1 Preparations .................................................................................................................................. 16
3.5.2 Pre Start-up Inspection................................................................................................................. 16
3.5.3 Start up and Commissioning ....................................................................................................... 16
4 The Controller ..................................................................................................................................................... 17
4.1 How it Works ............................................................................................................................................. 17
4.2Operating Mode Principle ........................................................................................................................ 17
4.3 Wired controller ......................................................................................................................................... 18
4.3.1 Controller ........................................................................................................................................ 18
4.3.2 Key to Buttons ............................................................................................................................... 18
4.3.3 Icon definition ................................................................................................................................. 18
4.4 Controller operation .................................................................................................................................. 19
4.4.1 Changing the mode ..................................................................................................................... 19
4.4.2 To modify a parameter .................................................................................................................. 19
4.4.3 To Set the Clock ............................................................................................................................ 20
4.4.4 To Set the Timer ............................................................................................................................ 21
4.4.5 Night mode ..................................................................................................................................... 22
4.4.6 Auto mode ...................................................................................................................................... 22
4.4.7 Weather Compensation Curve .................................................................................................... 23
4.5 System Protection and Error Codes ...................................................................................................... 23
4.6 System Adjustable Parameter Table...................................................................................................... 24
4.8 Parameter check ...................................................................................................................................... 26
5 Technical Specification ....................................................................................................................................... 28
5.1 Exploded drawings ................................................................................................................................... 28
5.2 System Schematic .................................................................................................................................... 30
5.3 Dimensions(mm) ...................................................................................................................................... 31
5.4 Specification .............................................................................................................................................. 33
6. Water pump water flow curves ......................................................................................................................... 35
7 Maintenance ......................................................................................................................................................... 36
7.1 Maintenance and Cleaning Guidance ................................................................................................... 36
8 How To Get The Most Out Of Your Heat Pump ............................................................................................... 36
9 Guarantee …………………………………………………………………………………….………………………………..…..36
9.1 Guarantee Terms ……………………………………………………………………………..……………………………….…….…37
10 Environmental Information…………………………………………………………………………………………………….………….37
11 Space Heating and Domestic Hot Water Operation…………………………………………………………..………………38
12 Optional Fittings Packs ..…………………………………………………………………………………………………………….……39
13 Technical Support ……………………………………………………………………………………..……………………………………39

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Installation and Maintenance
Solis Air Source Heat Pumps must be installed and maintained in accordance with
both current regulations and these instructions and by qualified and experienced
technicians. Failure to do so WILL invalidate the warranty. Although the Solis units
can be modified to provide cooling, the MCS accreditation applies to the Solis in
Heating mode only
This manual includes important information about the installation and maintenance of
the ESP Solis Air Source Heat Pump (ASHP) units. Please read this manual carefully
before installing or carrying out maintenance works on the unit. Please note that,
failure to observe the provisions in this manual will invalidate any warranty on the unit
and may lead to loss and/or damage to people and/or property for which ESP will not
be liable. All ESP ASHPs are covered by the warranty contained in the ESP Terms and
conditions of Business a copy of which will have been provided to you prior to your
purchase.
Safety Advice
It is important to take the following precautions when planning your installation, installing and
operating Solis ASHPs: Failure to observe these points could lead to loss or damage to
property and/or injury/death of installers/operators and will invalidate the warranty.
Switch the unit off at the rotary isolation switch before cleaning or maintaining the unit.
All installation and maintenance works must be carried out by a properly qualified technician.
None of the safety or control devices should be modified without the express permission of
Earth Save Products Limited.
Do not pull, detach, twist or otherwise damage the electrical cables coming from the unit
Do not introduce any objects through the grill and into the fan or any other part of the unit.
Important Notice for Antifreeze Protection
1. There must be enough Earth Save Products glycol in the system to avoid damage during cold weather.
Sufficient Glycol must be used to protect the system to -20°C.
2. The power supply must always be connected even when you don't use the heat pump. Our heat pumps
have an automatic antifreeze function that will only operate if power is maintained to the unit.
3. If the unit is to be left for long periods without use, the unit should be completely drained of fluid.
4. ESP Glycol is food grade and non-toxic.

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1 GENERAL
The unit is an air source heat pump for space heating and domestic hot water heater for both
domestic and commercial applications. Solis heat pumps use ambient (outdoor) air as a heat
source to generate heat for your property.
2 SYSTEM DESCRIPTION
The unit is a monobloc (single unit) air to water heat pump, specially designed for the colder
climate and for ease of a ‘no fuss’ installation.
The unit can provide both space heating and domestic hot water heating (via an external tank –
controlled by the Solis control system). Although the unit is also capable of cooling in the
summer, the parameter that allows this must be unlocked prior to delivery. The heat pump is
controlled via an intelligent wired control panel.
The units have a rated output of 11KW (ESP-HC-DHW 11DC) or 17kW (ESP-HC-DHW 17DC)
depending on the model. The material and components have been chosen and designed to
provide a long service life and to withstand harsh outdoor conditions.
Each unit has different installation options:
1) Space heating only.
2) Space heating + DHW (Domestic hot water)
Additionally, both units can be modified by Earth Save Products Limited before delivery to provide
a cooling circuit.
3 INSTALLATION
3.1 General points for installation engineer
3.1-1 Transport and storage
The unit should be transported and stored vertically. Care must be exercised so that the heat
pump is not scratched during transport and installation. And damage to the unit during transport
must be reported to Earth Save Products Limited immediately upon delivery. Any claim for
damage after the delivery documents have been signed will not be entertained.

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3.1-2 Commissioning the installation
The ASHP installation should be inspected before it is commissioned by a suitably qualified
person and must be recorded on the commissioning document then signed by both the installer
and the owner. Further, the installation of an ASHP is a notifiable occurrence under current
building regulations. If the heat pump is replaced, the installation must be re-commissioned.
3.1-3 Sitting the heat pump
The unit is placed (securely fixed through rubber ant-vibration feet) outdoors on a firm base,
preferably a concrete foundation. It should not be positioned in a position where the low running
noise is going to cause a nuisance, for example, next to a bedroom.
The base on which the unit is secured must be both large and strong enough to take the weight of
the unit comfortably and must not subside (see below). The base should also be at least 150mm
above the surrounding ground level and should be checked periodically to ensure that there is no
subsidence of the base or the immediate surrounds. In areas prone to flooding, care should be
taken to ensure that the unit is elevated to avoid flood damage. The base should be positioned to
ensure that the operation of the unit does not inconvenience any neighbours; this can be
achieved by carrying out the calculations required by MCS 020.
The installation site must be well ventilated but not windy.
Large amounts of condensate as well as water from defrosting can be produced. There must be
sufficient drainage at the installation site to ensure the water cannot run onto paths or the like to
avoid ice forming during winter – a drain or a suitable soakaway must be provided. The distance
between the unit and the exterior wall must be at least 350 mm (see above). The free space
above the must be at least one meter to avoid recirculation of cold (exhaust) air. Where multiple
units are sited together, there must be sufficient space left between them for access but certainly
no less than 400mm.
3.1-4 Controller
The unit is equipped with an electronic controller that handles all functions necessary to manage

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heat pump operations. Parameters such as defrost trigger points, pressure and temperature
maximum and minimum, pressure switch behaviour, electrical protection and connection of the
compressor can all be changed. However, changing parameters can be dangerous in the
extreme or simply reduce system efficiency and PARAMETERS SHOULD NOT BE CHANGED
WITHOUT CONSULTING EARTH SAVE PRODUCTS LIMITED. The one exception is the
temperature set point maximum and minimum settings.
The controller can also be used to interrogate the number of starts and the operating time.
The controller is normally set during installation and, under normal operating conditions, the home
owner does not need change any setting whatsoever because the installer will set the unit to run
at maximum efficiency.
3.2 Installation design
ESP Solis units can be installed in several different ways to provide Space Heating (SH),
Domestic Hot Water (DHW – via an external storage vessel) or both. If requested, they can be
modified to provide cooling.
Safety equipment must be installed in accordance with current regulations for all installation
options. The final design of each installation is the responsibility of the installer. The following
shows a generic design:
3.3 Pipe Connection
An expansion vessel must be installed if the heating system is unvented. The size of the
vessel(s) must be determined by the installer on site and take into account the entire volume of
water/glycol mix being heated including the volumes contained in the Solis unit (s), the buffer
tank, the distribution system, emitters and any other system connected to the unit. For this

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reason, they are not included as part of the optional ASHP or buffer fittings pack. Expansion
vessels can, however, be provided by ESP as an additional optional extra.
If, as advised, you are using a buffer tank in the system, you will need to fit a suitably sized water
pump on the water distribution side of the system. This water pump will need to be wired to
receive an appropriate signal from the heating system. Because the pump must be sized
according to the requirements of the distribution system, this item is not provided by ESP as part
of any installation pack but can be provided as an optional extra. There is a water pump within
the Solis unit to provide circulation from the ASHP to the buffer tank or Low Loss Header. This is
controlled directly from the ASHP (even in standby mode) and is one of the reasons that the
ASHP should have power to it at all times.
28mm copper pipe must be used between the ASHP and the buffer tank or Low Loss Header.
The system must be sized so that the total water volume in the heat pump pipe system and buffer
tank must be at least 10 litres per KW of output. It is highly recommended that a suitably sized
buffer tank be installed between the unit and the heating distribution system. Please consult
your installer or ESP when considering this system design point – the right sized buffer tank can
make a significant difference to the economy, life span and efficiency of the unit and the heating
effectiveness.
The final connection to the heat pump flow and return must be made with suitable flexible pipes
to prevent vibration in to the system pipework. Please ensure that two wrenches are employed
to take up the torque created in tightening the fittings to avoid damage to both the fittings and
the heat pump. The flexi pipes are each attached to the ASHP via a 90° female/female fitting so
that the flexi pipes are angled downwards.
These flexible hoses are available from ESP as part of an optional ASHP Installation Pack or
individually
.
The pipe work of the whole system must be flushed and pressure tested before the heat pump is
connected, to ensure that any contaminants are removed and to avoid damage to the ASHP.
Shut-off valves and drain valves must be fitted so that unit can be emptied in the event of
prolonged power failures.

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The heating inlet and outlet hoses must be to the correct tappings as marked on the rear left side
of the unit:
A drain off cock must be connected to the correct tapping on the ASHP as above.
All outdoor pipes must be thermally insulated with external grade waterproof insulation at least a
30 mm thick wall. The insulation must also be vapor resistant. All indoor pipes must be lagged
with insulation with a wall thickness of at least 19mm.
Important: Even though the unit has anti-freeze protection, if the circulation pump fails or
there is a problem with the power supply, there is still a risk of damage due to freezing. The
system must be protected from freezing by using a glycol solution in the water circuits.
The glycol/water should be added into the system from the water loop or via the top of the
buffer tank. The Glycol must be suitable for the whole system which is why ESP can supply the
ideal glycol for the Solis as an optional extra. The following table details the volume of the
glycol/water solution mix:
Inlet Connection
Outlet Connection
Drain Off Cock
Connection