ESP 400-200Ltr User manual

©ESP Ltd. Sept 2008
Operation &Installation
Manual
The ESP Ecocent
Model:
ESP 400-200Ltr
ESP 400-250Ltr
ESP 400-300Ltr
Please keep this manual safely and read
it carefully before installation or operation

2 ©ESP Ltd. Sept 2008
Contents
Warning!!!!
READ THIS BEFORE INSTALLING THE
UNIT.
All un-vented water heating systems above 15 litre (this in-
cludes the ESP Hot Water ASHP‟s) MUST be installed to
meet the requirements of the Building Regulations. It is a
legal requirement that the local Building Control Officer be
notified of any proposed installation of un-vented water
heating systems over 15 litre capacity.
Furthermore, it must be fitted by an installer who has suc-
cessfully completed a recognised course in the installation
of un-vented heating systems such as CITB. Failure to prop-
erly fit the unit may affect its efficiency and invalidate any
guarantee.
Safety requirements in the UK call for an expansion space
(internal or external), safety devices to prevent the stored
water exceeding 100°C, and pipework to convey discharged
hot water safely away from the safety devices.
 Preface………………………………………………………………..3
 General Requirements………………………………………………..4
 Specs…………………………………………………………………6
 Function Presentation………………………………………………..8
 Installation…………………………………………………………...9
 Commissioning……………………………………………………...18
 Maintenance…………………………………………………………19
 User Instructions…………………………………………………….22
 Safety Precautions…………………………………………………...24
 Guarantee……………………………………………………………26
 Spare Parts…………………………………………………………...27
 Appendix 1…………………………………………………………..27
 Appendix 2…………………………………………………………..36

3 ©ESP Ltd. Sept 2008
Preface Hot water air source heat pump PLEASE NOTE FOR TRANSPORT AND STORAGE!!!:
Storage
The unit must be stored and/or transported in its shipping container in an
upright position and kept dry. For transport over short distance, and provided
due care is exercised, an inclination angle of up to 60 degree is permitted.
Both during transport and storage, ambient temperatures of - 20 to +70 are
the limits.
Transport using a forklift
When transporting by fork lift, the unit must remain mounted on the pallet.
The lifting height should be kept to a minimum. Due to its top-heaviness, the
unit must be secured against tipping over. To prevent any damage, the unit
must be placed on a level surface!
Manual transportation
For the moving the unit by hand, the wooden pallet can be used for bottom
lifting. Using ropes or carrying straps is permissible with great care being
taken not to damage the unit.
With all manual handling, care must be taken that the max. permissible incli-
nation angle of 60 degree is not exceeded. If transport in an inclined position
cannot be avoided, the unit MUST be left upright for at least 90 mins. in the
planned installation position before being installed. Failure to do this may
cause serious damage to the unit during and following installation.
This manual includes the necessary information about installation, and
maintenance of the Ecocent. Please read this manual carefully before
you install or carry out maintenance on the unit.
When installing the unit , please carry it out strictly according to the man-
ual.
Please do not switch the unit on until you are sure that it has been prop-
erly installed.
The installer should explain to the end user how to operate and maintain
the unit before handing over the unit to the end user. Also, the installer
should advise the end user to read the manual fully before operating the
unit.
The supplier and/or manufacturer of the unit will not be responsible if
someone is injured or the unit is damaged, as a result of installation, op-
eration and/or maintenance that is not in line with this manual. Further,
improper installation, operation and/or maintenance, and failure to main-
tain the unit as per this manual will invalidate any unit warranty or guar-
antee.
The manual may be altered and/or updated in any way at the sole discre-
tion of the supplier and/or ESP without notice.

4 ©ESP Ltd. Sept 2008
1. General Requirements
IMPORTANT : PLEASE READ AND UNDERSTAND THESE INSTRUC-
TIONS BEFORE INSTALLING THE ESP Ecocent (“DHW ASHP” or “unit”).
INCORRECT INSTALLATION WILL INVALIDATE ANY GUARANTEE.
THIS UNIT IS NOT INTENDED FOR USE BY PERSONS (INCLUDING
CHILDREN) WITH REDUCED PHYSICAL, SENSORY OR MENTAL CA-
PABILITIES, OR LACK OF KNOWLEDGE AND EXPERIENCE, UNLESS
THEY HAVE BEEN GIVEN SUPERVISION OR INSTRUCTION CON-
CERNING THE USE OF THE UNIT BY A PERSON RESPONSIBLE FOR
THEIR SAFETY.
THE UNIT MUST BE INSTALLED, COMMISSIONED AND MAIN-
TAINED BY A COMPETENT INSTALLER IN ACCORDANCE WITH
BUILDING REGULATION G3 (ENGLAND AND WALES), TECHNI-
CAL STANDARD P3 (SCOTLAND) OR BUILDING REGULATION P5
(NORTHERN IRELAND) AND THE WATER FITTING REGULA-
TIONS (ENGLAND AND WALES) OR WATER BYELAWS
(SCOTLAND). FOLLOWING INSTALLATION AND COMMISSION-
ING, THE OPERATION OF THE UNIT SHOULD BE EXPLAINED TO
THE USER AND THESE INSTRUCTIONS LEFT WITH THEM FOR
FUTURE REFERENCE.
PLEASE NOTE THAT THERE ARE ESSENTIALLY 2 UNITS COMBINED
INTO ONE IN THE ESP DHW ASHP AND YOU MUST BE SURE TO UN-
DERSTAND BOTH ELEMENTS—THE INDIRECT PRESSURIZED CYLIN-
DER AND THE AIR SOURCE HEAT PUMP.
1.1 COMPONENT CHECK LIST
Before commencing installation check that all the components for your unit
are contained in the package. The following components are supplied as stan-
dard with the unit :
• Factory fitted immersion heater (s) and thermal controls
•Cold Water Combination Valve (comprises Pressure Reducing Valve,
Strainer, and Check Valve)
• Expansion Core Unit (comprises Check Valve and Expansion Valve)
• Temperature/Pressure Relief Valve (set at 90 - 95°C/1 Mpa (7bar))
• Tundish (included in Cold Water Combination Valve pack)
• Factory fitted Indirect Thermostat and Thermal Cut-out
Further detail is provided on the above at Appendix 1 and you should make
sure that you read the Appendix thoroughly before undertaking any installa-
tion or other work on the unit.
1.2 SITING THE UNIT
The unit must be vertically floor mounted. It can be placed anywhere con-
venient provided the discharge pipe(s) from its safety valves can be correctly
installed. Areas that are subject to freezing must be avoided. Ensure that the
floor is of sufficient strength to support the weight of the unit when full with
water. Pipe run lengths should be kept as short as possible for maximum
economy and efficiency. Access to associated controls,immersion heaters
and indirect controls must be possible for servicing and maintenance of the
unit. Please do not install valves or pipework (except discharge pipe) within
50mm (2”) of the T&P relief valve to allow insulation to be fitted. The insu-
lation is important to ensure heat and energy conservation.
IMPORTANT NOTE: DO NOT SITE THE UNIT IN THE SAME ROOM
AS AN OPEN FLUED APPLIANCE OR A ROOM WHERE AN OPEN
FLUED APPLIANCE TAKES ITS COMBUSTION AIR FROM UNLESS
THE MATTER HAS BEEN CAREFULLY CONSIDERED AND ADE-
QUATE DUCTING AND VENTILATION HAS BEEN PROVIDED FOR
THE UNIT (THE DHW ASHP).
.
1. General Requirements Hot water air source heat pump Hot water air source heat pump

5 ©ESP Ltd. Sept 2008
Please be sure to use appropriate lifting equipment when moving the unit.
1.3 WATER SUPPLY
Bare in mind that the mains water supply to the property will be supplying both
the hot and cold water requirements simultaneously. Therefore, it is important
that the maximum water demand be assessed and the water supply checked to
ensure this demand can be met.
NOTE: A high mains water pressure will not always guarantee high flow rates.
Wherever possible the main supply pipe to the unit should be in 22mm. The
minimum mains water supply requirements should be 0.15 MPa (1.5 bar)
working pressure and 20 litres per minute flow-rate. At these values outlet flow
-rates may be poor if several outlets are used simultaneously, the higher the
available pressure and flow-rate the better the system performance will be.
The unit has a design operating pressure of 3 bar which is controlled by the
Cold Water Combination Valve. The Cold Water Combination Valve can be
connected to a maximum mains supply pressure of 1.6 MPa (16 bar). The water
supply must be of wholesome water quality (Fluid Category 1 as defined by the
Water Supply Regulations 1999).
The unit MUST be sited on a level surface, otherwise this could cause prob-
lems with condensate draining from the heat pump section of the unit in to the
condensate drain.
An inline strainer and scale inhibitor (WRAS approved) must be fitted “in line”
on the water supply to the unit. Failure to fit these will invalidate the unit war-
ranty/guarantee. All fittings must be WRAS approved.
1.General Requirements Hot water air source heat pump Hot water air source heat pump 1.General Requirements
1.4 OUTLET/TERMINAL FITTINGS (TAPS, ETC.)
The unit can be used in conjunction with most types of terminal fittings. It is
helpful in many mixer showers to have balanced hot and cold water supplies;
in these instances the balanced cold water supply should be tee‟d off the sup-
ply to the unit immediately after the Cold Water Combination Valve (see Fig-
ures 4 and 5). Branches to cold drinking water outlets should be taken before
the valve.
NOTE: Accessories should have a rated operating pressure of at least 0.8 MPa (8 bar).
1.5 LIMITATIONS
The unit should not be used in any of the following instances:
 Solid fuel boilers or any other boiler in which the energy input is not under
effective thermostatic control, unless additional and appropriate safety
measures are installed.
 Gravity circulation primaries.
 Steam heating plant unless additional and appropriate safety devices are
installed.
 Ascending spray type bidets or any other Class 5 back syphonage risk re-
quiring that a appropriate air gap be employed.
 Water supplies that have either inadequate pressure or where the supply
may be intermittent.
 Situations where it is not possible to safely pipe away any discharge from
the safety valves.
 Areas where the water contains a high proportion of solids, eg. suspended
matter that could block the strainer, unless adequate filtration can be en-
sured.
 Where another appliance in the room is vented by way of an open flu.
 The installation must be carried out in accordance with the relevant re-
quirements of:

6 ©ESP Ltd. Sept 2008
2.1 APPEARANCE
2.2 CHARACTERISTICS
Good looking and efficient
The attractive design allows the unit to be placed in the open in finished
utility spaces and basements; depending on ambient conditions, the cost
of operation can be 25% of that of an electric water heater, and can be
used in locations unsuitable for solar hot water heating.
Environmentally friendly and safer
Produces no harmful emissions locally; there is no combustion of oil,
coal, or natural gas. No carbon monoxide is produced and there is no
open flame.
Easy to operate and multiple heat sources
Contains a timer for start and stop and an adjustment dial for easy setting
of the water temperature; the unit can take heat from a number of sources
- the outside environment, from an attic space, or from hot areas in light
industrial environments.
2.Specs
A) The appropriate Building Regulations: either The Building Regula-
tion (England), The Building Regulations (Scotland) or Building
Regulations (Northern Ireland).
B) The Water Fittings Regulations (England and Wales) or Water Bye
laws (Scotland).
C) Any other applicable Regulations.
Failure to observe any of the above conditions will invalidate the war-
ranty/gurantee.
1.6 HOT WATER AIR SOURCE HEAT PUMP PACKAGE
The unit will be supplied with the fittings detailed in section 1.1 above.
Hot water air source heat pump
1.General Requirements Hot water air source heat pump

7 ©ESP Ltd. Sept 2008
2.3 DIMENSIONS
ESP 400 SERIES—150L/200L/250L/300LD
Unit/mm
2.4 PERFORMANCE PARAMETER
Measuring conditions
Instant heating: Ambient temperature 20/19,Water outlet 55°C
Operating range
(1).Ambient temperature range is 0-40°C
(2). The max water temperature is 60°C
2. Specs
2. Specs Hot water air source heat pump Hot water air source heat pump
Please note - Stabbings may vary by model.
Model ESP400 010-150L(D) 010-200L(D) 010-250L(D) 010-300L(D)
Heating capacity kW 2.6 2.6 2.6 2.6
Water tank capacity L 150 200 250 300
Power input W 810 810 810 810
Running current A 3.7 3.7 3.7 3.7
Power supply V/PH/ 220/1/50 220/1/50 220/1/50 220/1/50
Compressor Number 1 1 1 1
Compressor Rotary Rotary Rotary Rotary
Rated outlet water tempera- °C 55 55 55 55
Max. outlet water tempera- °C 60 60 60 60
Air volume M³/h 450 450 450 450
Air pressure Pa 60 60 60 60
Duct diameter Mm Φ200 Φ200 Φ200 Φ200
Noise dB(A) 49 49 49 49
Water inlet size/outlet size Inch ¾" ¾" ¾" ¾"
Auxiliary electrical heating kW 1.5 1.5 1.5 1.5
Net dimensions mm φ470≠1830 φ560≠1700 φ560≠1950 φ640≠1750
Net weight Kg 63 81 81 88
Shipping weight kg 68 78 86 93

8 ©ESP Ltd. Sept 2008
3.Function presentation
3.1 PLEASE NOTE:
Heating capacity
The unit absorbs energy from the air inlet location ambient conditions. If the
air inlet temperature is low, heating capacity will show variation from standard
conditions.
3 minutes protection
When the unit stops, if you restart the unit or turn on the manual switch, the
unit will not run for 3 minutes. This is built in protection for the compressor.
Heating mode running
If the ambient temperature is too high, to protect the unit, the fan motor will
stop running.
Defrosting
When in heating mode, the unit will defrost automatically. The fan motor will
stop running when the unit is defrosting.
Working condition
The unit should be run at ambient temperatures of 0-40 deg. The unit includes
sophisticated electronic devices - do not fill the heating system with water
from lake, river water or groundwater and be sure to put an inline strainer and
scale inhibitor in the cold water feed - failure to do so will invalidate the war-
ranty/guarantee.
Power off
If the power supply is off, the unit will stop running. If operation is disturbed
by lightning, power grid fluctuations or similar, please turn the power supply
off manually and then power on again to reset.
3.Function presentation Hot water air source heat pump
Hot water air source heat pump
Earthing
The unit MUST be earthed and facility is provided for this in the unit design
- be sure to have the unit properly earthed during installation. You must have
the unit fitted by a suitably qualified installer - we accept no responsibil-
ity for units that are not fitted by fully qualified installers. Also, failure
to have the unit fitted by a suitably qualified installer will invalidate the
warranty/guarantee of the unit.

9 ©ESP Ltd. Sept 2008
4.1 INSTALLATION DIAGRAM
Please note: Circulation of the hot water, solar and heat reclaims is optional.
Please contact Earth Save Products before using the primary coil.
ATTENTION
The one-way safety valve attached with the unit must be installed or it will
cause damage to the unit and can cause injury in certain circumstances.
Ensure that any damage to the unit caused prior to delivery is notified to the
Supplier within 5 days of delivery. Failure to notify the Supplier within this
time period will mean that any claims relating to damage will be rejected.
4.2 PIPE FITTINGS
All pipe connections to the unit are 22mm. The fittings are also threaded
3/4” BSP male should threaded pipe connections be required.
Air ducts must be at least in 6 inch rigid pipe.
4.3 COLD WATER SUPPLY
A 22mm cold water supply is recommended, however, if a 15mm (1/2”) sup-
ply exists which provides sufficient flow (see section 2.3) this may be used.
More flow noise may be experienced from small bore pipes due to the in-
creased water velocity through them.
The Cold Water Combination Valve supplied with the unit incorporates a
full flow isolating valve which will enable the unit to be isolated from the
mains supply for maintenance or servicing. To close the valve the black han-
dle should be turned so that it lies at 90°C to the direction of flow. To open
turn the handle so that it lies parallel to the direction of flow.
An inline filter and an effective scale prevention device must be fitted to the
cold feed.
4.4 COLD WATER COMBINATION VALVE (see Figure 2)
The Cold Water Combination Valve must be sited close to the unit to allow
the safety discharge pipe to run in to the tundish, in line with appropriate
Regulations. The Expansion Valve connection must not be used for any
other purpose.
The Cold Water Combination Valve can be installed as a complete one-piece
unit. The valve incorporates a factory set, non-adjustable Pressure Reducer/
Strainer, an Expansion Valve connection and a single Check Valve. The
valve can be fitted in any orientation to suit the installation, however, ensure
that the Valve is installed with the direction of flow arrows (stamped on the
side of the brass body) pointing towards the unit.
4. Installation 4. Installation
Hot water air source heat pump Hot water air source heat pump

10 ©ESP Ltd. Sept 2008
4 . Installation 4 . Installation
Should you wish to site the Expansion Valve on the Cold Water Combination
Valve this can be done by unscrewing the connection nut beneath the Expan-
sion Valve on the Expansion Core Unit and removing the Expansion Valve.
The connecting nut and blanking plug should then be unscrewed from the Cold
Water Combination Valve and replaced with the Expansion Valve. Note: if the
Expansion Valve is fitted to the Cold Water Combination Valve the Expansion
Core Unit should not be used as the Check Valve within it will prevent free
passage of expanded water to the Expansion Valve. Ensure the discharge from
the Expansion Valve can be correctly installed.
If a balanced pressure cold water supply is required to a thermostatic shower
mixer valve this may be tee‟d off the supply to the unit immediately after the
Cold Water Combination Valve (see Figure 4). Branches to drinking water out-
lets should be taken before the valve to avoid the possibility of warm expanded
water being drawn from the tap.
4.5 EXPANSION CORE UNIT (see Figure 3)
Should a balanced pressure cold water supply be required for other cold water
outlets the Expansion Core Unit supplied should be used. The Core Unit should
be fitted into the pipework between the Cold Water Combination Valve and the
unit (note direction of flow arrows). The cold water balanced draw off connec-
tion should be taken from between the Cold Water Combination Valve and the
Expansion Core Unit (see Figure 5). The Expansion Valve connection on the
Cold Water Combination Valve should remain blanked off using a blanking nut
and seal. Ensure the discharge from the Expansion Valve can be correctly in-
stalled.
Hot water air source heat pumpHot water air source heat pump

11 ©ESP Ltd. Sept 2008
4.6 DRAIN TAP
A draining tap should be installed in the cold water supply to the unit be-
tween the Cold Water Combination Valve (or Expansion Core Unit if being
used) and the heater at as low a level as possible It is recommended that the
outlet point of the drain pipe work be at least 1 metre below the level of the
heater (this can be achieved by attaching a hose pipe to the drain tap outlet
spigot).
4.7 OUTLET PIPEWORK
Ideally the pipework from the unit to the outlet fittings should be in 22mm
pipe with short runs of 15mm pipe to showers and basin taps. Small bore pipe
can also be used to suit some taps, but runs should be of minimum length.
Pipe sizes may vary due to system
4.8 SECONDARY CIRCULATION
If a secondary circulation system is required it should be installed as per Fig-
ure 6. The secondary return pipe should be in 15mm pipe and incorporate a
check valve to prevent backflow. A suitable WRAS approved bronze circula-
tion pump will be required with appropriate unions. On large systems, due to
the increase in system water content, it may be necessary to fit additional ex-
pansion volume to the system by fitting an external expansion vessel to the
secondary circuit. This should be done if the capacity of the secondary circuit
exceeds 10 litres.
Pipe capacities (copper)
15mm o/d = 0.13 litres per metre run (10 litres = 77m)
22mm o/d = 0.38 litres per metre run (10 litres = 26m)
28mm o/d = 0.55 litres per metre run (10 litres = 18m)
Secondary circulation is NOT recommended for units being used on “Off
Peak” electricity tariffs.
4 . Installation 4 . Installation
Hot water air source heat pump Hot water air source heat pump

12 ©ESP Ltd. Sept 2008
4 . Installation 4 . Installation
4.11 DISCHARGE PIPEWORK
It is a requirement of Building Regulations that any discharge from an un-
vented system is conveyed to where it is visible, but will not cause danger to
persons in or about the building. The tundish and discharge pipes should be
fitted in accordance with the requirements and guidance notes of Building
Regulations. Building Regulation G3 Requirements and Guidance section
4.10 are reproduced in the following sections.
Information Sheet No. 33 available from the British Board of Agrément gives
further advice on discharge pipe installation. For discharge pipe arrangements
not covered by G3 Guidance or BBA Info Sheet No.33 advice should be
sought from your local Building Control Officer. Any discharge pipe con-
nected to the pressure relief devices (Expansion Valve and Temperature/ Pres-
sure Relief Valve) must be installed in a continuously downward direction
and in a frost free environment.
The water may drip from the discharge pipe of the pressure relief device and
that this pipe must be left open to the atmosphere. The pressure relief device
is to be operated regularly to remove lime deposits and to verify that it is not
blocked.
Please see figure 7 for typical discharge arrangement.
EXPANSION VESSEL
An appropriately sized expansion vessel must be fitted to the system in which
the unit is incorporated and it should discharge in to the tundish. The Expan-
sion vessel can be fitted to the cold feed in to the unit (see Figures 4 and 6).
G3 REQUIREMENT
“...there shall be precautions...to ensure that the hot water discharged from
safety devices is safely conveyed to where it is visible but will not cause dan-
ger to persons in or about the building.”
Hot water air source heat pump Hot water air source heat pump
4.9 T&P RELIEF VALVE (“TPRV”)
The TPRV is factory fitted and must not be interfered with in any way and/or
removed - under NO circumstances should the installer or end user tamper
with the TPRV or the warranty/guarantee will be invalidated and serious dam-
age may occur. You will find detailed information on this safety device at Ap-
pendix 2.
4.10 WARNINGS
i) Under no circumstances should the factory fitted TPRV be removed other
than by approved, fully trained and experienced fitters. To do so will invali-
date any warranty/guarantee or claim.
ii) The Cold Water Combination Valve, in line strainer and scale inhibiting de-
vice must be fitted to the mains water supply to the unit.
iii) No control or safety valves should be tampered with.
iv) Water may drip from the discharge pipe of the pressure relief device
(Expansion Valve) and this pipe must be left open to atmosphere. The dis-
charge pipe should not be blocked or used for any other purpose.
v) For units with primary coil facilities, please discuss use of the coil, and a
suitable configuration for use, with ESP before proceeding to add a heat
source to the primary coil.

13 ©ESP Ltd. Sept 2008
G3 GUIDANCE SECTION 4.10
The discharge pipe (D1) from the vessel up to and including the tundish is
generally supplied by the manufacturer of the hot water storage system. Where
otherwise, the installation should include the discharge pipe(s) (D1) from the
safety device(s). In either case the tundish should be vertical, located in the
same space as the unvented hot water storage system and be fitted as close as
possible and within 500mm of the safety device e.g. the TPRV.
The discharge pipe (D2) from the tundish should terminate in a safe place
where there is no risk to persons in the vicinity of the discharge, preferably be
of metal and:
a. be at least one pipe size larger than the nominal outlet size of the safety de-
vice unless its total equivalent hydraulic resistance exceeds that of a straight
pipe 9m long i.e. discharge pipes between 9m and 18m equivalent resistance
length should be at least two sizes larger than the nominal outlet size of the
safety device, between 18 and 27m at least 3 sizes larger , and so on. Bends
must be taken into account in calculating the flow resistance. Refer to Dia-
gram 7 and Table 1 below.
An alternative approach for sizing discharge pipes would be to follow BS
6700:1987 Specification for design, installation, testing and maintenance of
services supplying water for domestic use within buildings and their curti-
lages, Appendix E, section E2 and table 21.
b. have a vertical section of pipe at least 300mm long below the tundish before
any elbows or bends in the pipe work.
c. be installed with a continuous fall, and in a frost free environment.
d. have discharges visible at both the tundish and the final point of dicharge,
but where this is not possible or is practically difficult there should be clear
visibility at one or other of these locations.
Examples of acceptable discharge arrangements are:
i. ideally below a fixed grating and above the water seal in a trapped gully.
ii. downward discharges at low level; i.e. up to 100mm above external sur-
faces such as car parks, hard standings, grassed areas etc. are acceptable
providing that where children may play or otherwise come into contact
with discharges a wire cage or similar guard is positioned to prevent con-
tact, whilst maintaining visibility.
iii. discharges at high level; e.g. into a metal hopper and metal down pipe
with the end of the discharge pipe clearly visible (tundish visible or not)
or onto a roof capable of withstanding high temperature discharges of wa-
ter and 3m from any plastics guttering system that would collect such dis-
charges (tundish visible).
iv. where a single pipe serves a number of discharges, such as in blocks of
flats, the number served should be limited to not more than 6 systems so
that any installation discharging can be traced reasonably easily. The sin-
gle common discharge pipe should be at least one pipe size larger than the
largest individual discharge pipe (D2) to be connected. If unvented hot
water storage systems are installed where discharges from safety devices
may not be apparent i.e. in dwellings occupied by blind, infirm or disabled
people, consideration should be given to the installation of an electroni-
cally operated device to warn when discharge takes place.
Note: The discharge will consist of very high temperature water and steam.
Asphalt, roofing felt and non-metallic rainwater goods may be damaged by
such discharges and you must take this in to account when fitting the unit.
Should such damage be caused, ESP will accept no liability for any conse-
quent damage caused.
4 . Installation 4 . Installation
Hot water air source heat pump Hot water air source heat pump

14 ©ESP Ltd. Sept 2008
Table 1 - Sizing of copper discharge pipe (D2) for common T&P relief
valve sizes
4.12 HOW TO CONNECT TO THE HEAT PUMP
As the heat pump is an integral part of the unit, please contact the manufac-
turer for additional information where required.
PLEASE NOTE that only manufacturer approved engineers should carry out
any work on the heat pump. Call the manufacturer for the name of an ap-
proved engineer in your area.
THE FOLLOWING IS FOR REFRIGERANT ENGINEER ONLY:
1) Vacuum and filling Refrigerants.
The unit is supplied pre-gassed. Should a refrigerant fill be required at any
point, please note the following:
When you have finished the connection between the heat pump and the hot
water unit, you must create a vacuum in the hot water unit. See below pic-
tures 6 & 7 below:
A. Unscrew the screw cap of the high pressure valve on the heat pump, and
connect the multiplex manometer to the check valve.
B. Connect the vacuum pump to the multiplex manometer, then open them to
create a vacuum in the hot water unit, making sure the absolute pressure is
less than 70Pa, and lasts for 60 minutes.
C. When you have finished the vacuum test, open the check valve to let the
refrigerant go into the ASHP part of the unit.
4 . Installation 4 . Installation
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15 ©ESP Ltd. Sept 2008
D. When you need to add the refrigerant, please do so as follows:
2) Controller system test
Switch on the power to the unit, check the display of the wire controller-it
will display the water temperature when the unit is on standby mode. If
the wire controller display is showing an incorrect reading or an error
code, please refer to Section 6.9.
3) Debug the cooling system
a) On completing wiring of the unit, please release a little refrigerant from
the low pressure side, or use the vacuum pump to create the vacuum in
the system, until the pressure is below 70Pa.
b) Once the unit is in vacuum, please open the high pressure valve and the
low pressure valve until the pressure is balanced, then check the joints
for leaks.
c) Ducting—Please ENSURE that ducting is safely and appropriately fitted.
IMPORTANT Do not allow any impurities to enter the refrigerant system
4) Insulation treatment
As per the below picture, you must insulate all connecting pipes and you
must use good quality, non flammable, PVC insulating material, of 15mm-
20mm thickness.
(a) To keep the pipes in a tidy state, you may wrap the pipes together after
being separately insulated.
(b) Under no circumstances should you let electric wires come in to con-
tact with the plumbing.
NOTE: With the 400 Series, the ASHP and the cylinder are one unit and
the above should be interpreted accordingly.
4 . Installation 4 . Installation
4.13 INDIRECT THERMAL CUT-OUT AND 2-PORT MOTORISED
VALVE
To comply with Building Regulations and to prevent the unit from overheat-
ing a 2-port motorised valve MUST be fitted to the primary flow to the indi-
rect coil—See Figure 11 below Please note that this diagram may vary from
model to model, but the principle does not.
4.14 WIRING
All electrical wiring MUST be carried out by a competent electrician and be
in accordance with the latest I.E.E. Wiring Regulations. The wiring block
diagram is set out below in Picture 14.
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4.Installation 4. Installation
Great care should be taken to ensure that the unit is properly wired to the
mains electricity and any auxiliary components.
The mains wire connection will be found towards the bottom of the unit. The
power supply MUST be switched.
The 2-port motorised valve MUST be wired in series with the Indirect controls
(for the unit Indirect Thermostat and Thermal Cut-Out) such that the power
supply to the valve is interrupted should either the Thermostat or Thermal Cut-
Out operate. Wiring to external controls is made via the terminal block fitted.
The cable should be routed through the aperture in the terminal cover and se-
cured using cable grips. The Indirect Thermal Cut-out MUST NOT be by-
passed.
4.15 UNIT/SYSTEM CONTROLS
The controls either supplied with the unit or to be purchased from reputable
suppliers, must be properly installed to ensure the safe operation of the unit.
Other controls/zone valves will be necessary to control solar (or other) auxil-
iary requirements.
4.16 IMMERSION HEATER(S)
The unit is supplied with an immersion heater which can be used as an alter-
native and/or complementary heat source to raise the temperature of the wa-
ter in the unit to above 60°C once a week to remove any risk from legionella
bacteria. The immersion heater is located in the side of the unit
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Some things to be considered in positioning the unit:
(1) Waste heat is useful heat (picture 10)
The standard heat exchanger of the hot-water heat pump enables direct connec-
tion to a second stable heat generator, e.g. a solar heating system or a boiler.
(2) Dehumidification in the re-circulating air mode (picture 11)
Dehumidified air in the laundry room supports laundry drying and prevents
moisture-induced damage.
Picture 10
Picture 11
(3) Cooling in the re-circulating air mode (picture 12)
Room air can be extracted from a storage room or a wine cellar, subsequently
cooled and dehumidified in the heat pump and finally re-introduced into the
room. Recreation rooms, boiler rooms or utility rooms are ideal installation
sites. The air ducts leading through warm sections must be insulated to pre-
vent the formation of condensation. All ducting must not restrict airflow.
Therefore, 6 inch
Picture 12
(4) variable change over of intake air
A duct system with integrated bypass flaps can be installed to utilise the cold
air produced by the unit.
Picture 13
4. Installation 4. Installation
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4 . Installation
1. Decide upon the right route to be taken to move the unit;
2. Try to move the unit in its original case;
3. Be sure to have the unit and electrics fitted by qualified tradesmen.
4. Ensure that no building materials or debris are allowed to enter the air ducts
at the top of the unit or any extension thereof. NOTE: Ducting must be 6
inches in size.
Check for obvious signs of damage to the cylinder and controls before under-
taking commissioning work.
Ensure that the Drain Cock at the base of the appliance is closed before
commencing.
1) Open all outlet taps;
2) Turn on mains water supply and allow the unit to fill;
3) Ensure that the hot water system is flushed in accordance with BS 6700;
4) Close taps in turn after having purged the system of air;
5) Check for leaks around the controls and immersion heaters and again
after the unit has heated up;
6) Check that no water is passing to waste through the relief valves;
7) Ensure that the line strainer (situated in the pressure reducing valve) is
clear of installation debris and clean if necessary;
8) Test the operation of the temperature & pressure relief and expansion
valves by lifting/turning the manually operated test lever/cap and
observing that water flows through freely and safely to waste;
9) Turn on electricity (and check for any wiring errors);
10) Check that the discharge pipe is plumbed to Local Regulations so that it
falls continuously and that no taps, valves or other shut off devices are
installed in the pipe;
11) Check that all thermostats are set appropriately;
12) Fill the indirect/solar (primary) circuit (if used). Allow unit to heat up
and check operation of indirect thermostat on motorised valve(s);
13) Check the temperature of the hot water at the nearest outlet and record
in any Log Book provided with the unit (if any);
14) Demonstrate operation to end user, including operation of temperature &
pressure relief valve and what to do if it operates
Hot water air source heat pump 5. Commissioning Hot water air source heat pump
SOME NOTES ON DUCTING
Air ducts to and from the heat pump should be in 6 inch (preferably rigid) pipe.
The outlets should be fitted with a suitable “flap” or “guard” device to prevent
rain, debris, animals and plants entering the ducts.
When servicing the unit, ducting should be checked to make sure that it is
clear and obstruction removed.
Installation points

19 ©ESP Ltd. Sept 2008
5. Commissioning 6. Maintenance
6.1 MAINTENANCE REQUIREMENTS (The Cylinder)
To ensure the continued optimum performance of the unit it should be regu-
larly maintained. This is of particular importance in hard water areas or
where the water supply contains particulate matter. Maintenance should be
carried out by a competent person and any replacement parts used should be
supplier recommended spare parts. It is recommended that maintenance is
carried out every 12 months on the cylinder and includes the checks detailed
in this manual.
In hard water areas consideration should be given to periodically de-scaling
the immersion heater elements. To do this the unit will need to be drained;
6.4 and 6.5 below detail how to drain the unit and remove the immersion
heater(s).
Please check the condition on the magnesium anode on any servicing/
maintenance and fit a new anode, if required.
6.2 CHECK OPERATION OF SAFETY VALVES
Slowly open the Temperature and Pressure Relief Valve by twisting its cap
for a few seconds. Check water is discharged and that it flows freely through
the tundish and discharge pipework. Check valve reseats correctly when re-
leased.
NOTE : The water discharged may be very hot.
Repeat the procedure for the Expansion Relief Valve (located on the Cold
Water Combination Valve or Expansion Valve Core Unit).
6.3 CLEAN THE STRAINER
The in line strainer must be cleaned periodically by a suitably qualified engi-
neer. The engineer should:
i) Wash any particulate matter from the inline strainer under clean running
water.
ii) Refit the inline strainer once totally clean or install a new one.
15) Give this manual along with the completed Log Book (if any) to the end
user to retain for future reference and make the customer aware that peri-
odic checks of the equipment are essential for safety.
PLEASE NOTE that
 you must have the unit fitted and commissioned by a suitably qualified engi-
neer ; and,
 installation instructions must be followed;
Failure to do so will invalidate any unit warranty/guarantee.
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6.4 DRAINING THE UNIT
Switch off the electrical supply to the immersion heater(s) and heat pump. Turn
off the mains water supply to the unit. Attach a hosepipe to the drain cock hav-
ing sufficient length to take water to a suitable discharge point below the level
of the unit, at least one metre below the unit is recommended. Open hot water
tap nearest to the unit to relieve the system pressure. Open drain cock. If water
fails to drain from the unit vent the unit by manually opening the Temperature/
Pressure Relief Valve or “crack a joint” in the unit plumbing to prevent the
creation of a vacuum that may prevent effective draining.
6.5 DESCALING IMMERSION HEATER(S)
Open the cover(s) to the immersion heater housing(s) and disconnect wiring
from immersion heater(s). Remove the thermostat by carefully pulling out-
wards from the immersion heater. Unscrew immersion heater backnut(s) and
remove immersion heater from the unit. Over time the immersion heater gas-
ket may become stuck to the mating surface. To break the seal insert a round
bladed screwdriver into one of the pockets on the immersion heater and gently
lever up and down.
Carefully remove any scale from the surface of the element(s). DO NOT use a
sharp implement as damage to the element surface could be caused. Ensure
sealing surfaces are clean and seals are undamaged, if in doubt fit a new gasket.
Replace immersion heater(s) ensuring (where appropriate for the unit being
worked upon) the lower (right angled) element hangs vertically downwards
towards the base of the unit. It may be helpful to support the immersion heater
using a round bladed screwdriver inserted into one of the thermostat pockets
whilst the backnut is tightened. Replace the thermostat(s) by carefully plugging
the two male spade terminations on the underside of the thermostat head into
the corresponding terminations on the element.
Rewire the immersion heater(s). Close and secure terminal cover(s).
6. Maintenance
6.6 REFILLING SYSTEM
DO NOT switch on the immersion heater(s) or heat pump part of the unit
until the system has been completely refilled.
Close the drain tap. With the hot tap open, turn on mains water supply. When
water flows from the hot tap allow to flow for a short while to purge air and
to flush through any disturbed particles. Close hot tap and then open succes-
sive hot taps in system to purge any air. The electrical supply can now be
switched on.
6.7 LOG BOOK
Please complete any log book supplied with the unit stating what has been
done, the date of the service and the name/contact details of the servicing
engineer.
6.8 MAINTENANCE REQUIREMENTS (For Heat Pump)
Check the water supply and air vent frequently, to avoid lack of water or
air in the water loop. Clean the inline strainer regularly to maintain water
quality and check that the scale inhibitor is still working effectively. Re-
place as appropriate. Lack of water and dirty water can damage the unit.
The heat pump will start the water pump every 72 hours when it is not
running, to avoid freezing.
Keep the unit in a place which is dry and clean, and has good ventilation.
Clean the heat exchanger every 1 or 2 months to maintain a good heat
exchange rate.
Check each part of the unit and the pressure of the system. Replace any
failing part, and recharge the refrigerant if it is necessary.
Check the power supply and the electrical system to ensure that all is in
order. If any part has failed replace it. Check for any unusual smells that
may indicate parts about to fail.
6. Maintenance
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