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

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
%Glycol 10 20 30 40 50
AmbientTemp ‐3 ‐8 ‐14 ‐22 ‐33
HeatingCapacityFluctuation .991 .982 .972 .961 .946
PowerInputFluctuation .996 .992 .986 .976 .966
WaterFlowFluctuation 1.013 1.040 1.074 1.121 1.178
WaterDropFluctuation 1.070 1.129 1.181 1.263 1.308

Note: if the glycol/water mix is too concentrated, the water flow and water pump will be affected and the efficiency
of the unit will be decreased. The above table is for reference only and you should use a glycol/water solution that is
suited to local conditions. Using an incompatible Glycol may invalidate your warranty.

You must fit a filter or Y-strainer in-line on the return pipe
between the buffer tank (or Low Loss Header) and the
ASHP. This is normally fitted in an external location
(outside the property) and must have a full flow lever valve
either side of the strainer to minimise glycol loss during
maintenance. Due to the mix of metals in the Solis it is
both advisable and preferable to install a Spirotrap ® (or similar) rather than
the minimum standard Y strainer. Failure to fit a good quality strainer in the
return flow to the unit will invalidate the warranty on the unit. This filter must be cleaned as
part of the annual maintenance cycle.
ESP Strongly recommend the use of a flow setter in the return pipework from the buffer to the
Solis ASHP. This will allow the system flow rate to be optimised for the individual project to
increase efficiency.
Automatic bleed valves (air vents) must be fitted at all high points in the system. The Solis will
shut down if air is in the system because the water flow switch will recognize air in the system
as no water flow and a system alarm/protection code will appear on the unit controller (code EF
or P6).
A suitable strainer, flexible hoses, flow setter, lever valves and swing-check valves can
be supplied as part of the optional fittings pack.
3.4 Electrical Connection
There are three electrical connections to be made to the Solis ASHP.
Electrical installation must be carried out by a qualified
electrician and in accordance with current regulations.
Under no circumstances should power be connected to the unit
if the controller is disconnected.
Failure to do so may be hazardous, may lead to prosecution
and will invalidate an
y
warrant
y
.

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3.4-1 Installation Drawings
Undo the 4 retaining screws and retain for re fitting, remove the access panel to the right side of the unit
and place the panel in a safe place where it cannot be damaged and is protected from being scratched.
All three wires should be fed through the two glands at the rear of the unit, taking care not
to damage the gromets so that the waterproof seal is not damaged:
The 240V connection, controller and Zero volt ‘call’ signal from the circulation control
system (normally a wiring centre) should be connected as follows:
Apertures for wires
Rear left hand of Solis ASHP

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Solis 17kW:
Solis 11kW:
Zero Volt connection from
circulation control system
Controller Connection Plug
Mains Voltage Connection Block
Controller Connection
Plug
Zero Volt connection
from circulation
control system
Mains Voltage Connection
Bloc
k

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3.4-2 Electrical Connections for all Solis Units.
Zero Volt ‘Call’
The unit is shipped with a link wire in the zero-volt connector block. This should be
removed and a 2 core wire should be run from the circulation system controller (normally a
wiring centre), through the wiring gland at the rear of the unit and connected to this
connection block.
Controller
The controller should be disconnected at the plug shown above, the cable routed from
the desired position, though the wiring gland and re-connected to the plug. The cable is 3
core and can be run a maximum of 100m.
Power should never be applied to the unit if the controller is disconnected
240V Mains Connection
The Solis unit must be connected to its own Type C MCB
(32Amp for the 17kW and 20Amp for the 11kW) on the consumer
unit via a rotary isolation switch installed in accordance with current
regulations. The cable from the rotary isolation switch should be
routed through the electrical gland on the rear of the unit and
connected to the main voltage connection block shown above.
Typical rotary
Isoation Switch

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Wiring Diagram SOLIS 11
For options to control a 3-way valve for DHW production.
See DHW Appendix.

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Wiring Diagram SOLIS 17
For options to control a 3-way valve for DHW
p
roduction. See DHW A
pp
endix.

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3.5 Commissioning
3.5-1 Compressor Delay
To safeguard the Solis 17kW compressor, the compressor heater will run for a defined period of time
before the compressor starts for the first time. If the ambient temperature is below 10°C but above 5°C,
it will run for 3 mins, if it is between 5°C and 0°C, it will run for 5 mins and if the ambient temperature is
below 0°C, it will run for 10 minutes. This delay does not apply to the Solis 11kW model.
Filling and Venting
The entire system should be filled, flushed, refilled and pressure tested before connection to the Solis
unit. Only when all debris has been removed, any leaks corrected and the system thoroughly purged of
air should the Solis be connected to the rest of the system, the system topped up and any air purged..
Pre Start-up Inspection
Mechanical Inspection:
a. Check the cabinet and internal pipes for signs of damage during transportation.
b. Check that the Fan can rotate freely.
Electric System Inspection:
a. Check the power supply (voltage/frequency) matches the rating label and specification.
b. Check all electrical connections for loose or damaged wires.
Pipe Inspection
a. Check that flow directions on all valves and other directional fittings is correct.
b. Check that all pipes have been properly insulated.
3.5.3 Start up and Commissioning
After the system has been inspected and any faults corrected, the unit can be set-to-work:
Switch on the isolator to turn on the power to the heat pump.
The circulation pumps will start immediately.
After 30 seconds, the fan motor will start.
After another 10 seconds, compressor starts (see above for delay for compressor heater to
run).
Air may be released as the water/glycol mix is heated and further bleeding may be necessary. If
bubbling sounds can be heard from the heat pump, the circulation pump or emitter system, the
entire system will need to be bled again and the system topped up as necessary to achieve the
required pressure.
Check the inlet/outlet temperature differential when flow temperature has been achieved and
adjust the flow setter as appropriate.
Adjust the parameters according to maximise efficiency and in accordance with the design.
The ambient temperature parameter value (parameter P09) can be set to a value between -
20°C and 30°C. The factory setting is 0°C. On commissioning, this should be set to the design
ambient temperature for the locale.

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4 THE CONTROLLER
4.1 How it works
Start-up / Shut-down Sequence
When there is a ‘call’ for heat from the Solis, the water circulation pump starts followed by the fan
(30 seconds later) then, after a further 10 seconds, the compressor. (see above for set-to-work
delay).
When the heat pump switches off, the compressor stops first, followed by the fan 5 seconds later
then the water circulation pump shuts down 30 seconds after the compressor.
When the compressor shuts down, it has a minimum interval of 3 minutes before it will start again.
During a defrost cycle, the compressor stop/start interval is based on the defrost parameters
During defrost, the water circulation pump runs continuously.
Compressor Operation
Once started, the minimum run time for the compressor is 15 mins.
4.2 Operating Mode Principle
1) Space Heating Mode
The temperature can be set to a value between 10°C and 55°C, the factory setting is 45°C. This
should be set to the design flow temperature calculated by your heating designer.
2) Domestic Hot Water Mode
The DHW temperature can be set to any value between 10°C and 50°C. If a storage temperature
of greater than 60°C is desired, Earth Save Products Limited can advise on how to control this
through the unit using an auxiliary electrical heater controlled by the Solis. The default factory
setting is 50°C. Please note that the Solis unit will need to be altered before dispatch to enable
DHW production and requires an external storage vessel. A full explanation can be found in the
Solis Domestic Hot Water Appendix available from Earth Save Products Ltd.
3) Defrost Cycle
Solis heat pumps are fitted with an intelligent defrost cycle controlled automatically by the
microprocessors. A number of parameters are taken into account before defrost begins and
ends. The parameters set by the factory should not be changed without consulting your design
Engineer or Earth Save Products Limited. The defrost time will vary depending upon the working
conditions of the Solis unit. The length of, and interval between, defrosts cycles will vary.

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4.3 Wired controller
4.3.1 Controller
6 Keys are used to navigate the controller:
4.3.2 Key to buttons (above)
(1) Clock: Used to change the clock and timer
(3) Down key: used to reduce a parameter value or navigate down the menu
(4) Up key：used to increase a parameter value or navigate up the menu
(6) Confirm key: used to confirm a parameter value or setting
(8) Mode key: Used to change mode
(10) On/Off key: Used to Turn the heat pump on or off
4.3.3 Icon definition
Item Icon meanin
g
Item Icon meanin
g
Item Icon meanin
g
5 Not Used 7 Not Used 9Not used
11 Timer period 12 GH water pump or fan motor 13 DHW
14
Sterilization 15 Auto mode 16 Room heatin
g
17 Coolin
g
18 Service icon 19 Lock icon/Off b
y
Remote

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20 Temp 21 Indicatin
g
temp location 22 Temp unit
23 Defrost icon 24 Anti-freeze 25 Water pump
26 E-heater 27 Not Used 28 Compressor icon
29 Week displa
y
30 Time displa
y
31 Timer on icon
32 Timer off icon
4.4 Controller Operation
4.4.1 Changing the mode:
In Standby or On mode, press M, then press M again to cycle through the 7 modes:
AC AUTO (15), COOLING (17), HEATING (16), DOMESTIC HOT WATER( 13), AC AUTO (15) &
HOT WATER (13) TOGETHER, COOLING (17) & DOMESTIC HOT WATER TOGETHER( 13),
HEATING (16) AND DOMESTIC HOT WATER TOGETHER (13), COOLING AUTO (14).
Notes:
In heating plus DHW mode, DHW will be prioritized to comply with building regulations. See Appendix.
In DHW mode, the unit will not supply heating. See Appendix.
The Pasteurization cycle is automatic independent of any mode selected.
Cooling Mode is only available if the Solis Unit is modified before delivery.
4.4.2 To Modify a parameter:
The only parameter that should be changed is the set point temperature for space heating or
DHW production (if enabled). Changing any other parameter can decrease the unit’s efficiency
and, in extremis, prove dangerous. When contemplating changing parameters, the operator
should consult the heating engineer who installed the unit.
Modifying the parameters
When in running mode, the unit will use the factory set default values or the last changes made to
parameters.
To change the temperature set point:
In On or Standby modes, press the M and keys together until the control beeps. The current
operation mode will flash and by pressing the M key, you select the required parameter by cycling
through the modes in the following order: cooling, heating, DHW. When the required mode is
flashing, press the , and the value flash. Use the ▲ or ▼ to select the required value then
press key to confirm change and press to exit. If the key is not pressed within 15
seconds, the new value will not be saved and the unit will revert back to the previously saved value.
The default settings are in the table below. Please note that the cooling function is not available
unless enabled by Earth Save Products prior to delivery. For further details of the DHW function, see
the relevant appendix.