MICROWELL HP INVENTOR 2300 SPLIT User manual

Version: 01/2020 (last update: 2020-16-JUNE;CC1032)
HEAT
PUMP
for swimming pool water
heating & cooling
HP 2300 SPLIT INVENTOR
&
HP 2800 SPLIT INVENTOR
Installation and user manual

Installation and user manual HP2300/2800 SPLIT INVENTOR
Version: 01/2020 Page 2
HEAT PUMP MICROWELL HP
Thank you for purchasing Microwell swimming pool heat pump.
Before you use this device, it is necessary to carefully read the entire
Installation and user manual. It is not allowed to commence the heat
pump installation or operation unless full content of this Installation
and user manual is understood and acknowledged. Please keep the
Installation and user manual available in the case of any future
reference is required. Please provide this information also to each
user of the device. Please mind local regulations in your country regarding installation and
usage of this heat pump which are valid in addition to this User manual.
Contents
1. INTRODUCTION ............................................................................................................................... 4
1.1 Product description ................................................................................................................. 4
1.2 Package checking..................................................................................................................... 5
1.3 Waste disposal information .................................................................................................... 5
2. SAFETY MEASURES .......................................................................................................................... 6
2.1 Electrical safety........................................................................................................................ 6
2.2 Usage precautions................................................................................................................... 6
2.3 Handling precautions .............................................................................................................. 7
3. TECHNICAL SPECIFICATION ............................................................................................................. 8
3.1 Technical data.......................................................................................................................... 8
3.2 Swimming pool water parameters.......................................................................................... 9
3.3 Heat pump dimensions ........................................................................................................... 9
3.4 Description of the basic parts.................................................................................................. 9
3.5 Security and control systems ................................................................................................ 11
3.6 Block wiring diagram of the PCB board – Display on condensing unit.................................. 12
3.7 Block wiring diagram of the PCB board – Display on water unit........................................... 13
3.8 Block wiring diagram legend ................................................................................................. 14
4. HEAT PUMP INSTALLATION AND CONNECTION................................................................................ 15
4.1 Positioning............................................................................................................................. 15
4.2 Connection to water filtration circuit.................................................................................... 16
4.3 Needed components for connection to water circuit........................................................... 17
4.4 Electrical connection ............................................................................................................. 19
4.5 Refrigerant circuit connection............................................................................................... 19
4.6 Flaring work........................................................................................................................... 21
4.7 Seaside installation................................................................................................................ 24

HP2300/2800SPLIT INVENTOR Installation and user manual
Page 3Version:01/2020
HEAT PUMP MICROWELL HP
4.8 Multiple heat pump connection............................................................................................ 24
4.9 Control of the circulation pump............................................................................................ 25
4.10 Separate water circuit ........................................................................................................... 26
4.11 Circulation pump connection ................................................................................................ 26
5. REGULATION.................................................................................................................................. 27
5.1 Description of the LCD panel................................................................................................. 27
5.2 General heat pump control................................................................................................... 28
5.3 Heat pump operational modes ............................................................................................. 29
5.4 Clock ...................................................................................................................................... 29
5.5 Timer ..................................................................................................................................... 30
5.6 Child lock ............................................................................................................................... 31
5.7 Parameters check .................................................................................................................. 31
5.8 Setting of the operating parameters..................................................................................... 32
5.9 Phase monitor specification .................................................................................................. 34
6. ACCESSORIES ................................................................................................................................. 36
6.1 Winter module ...................................................................................................................... 36
6.2 Heat exchanger frost protection ........................................................................................... 36
6.3 Condensate tray defrost........................................................................................................ 36
6.4 Protection cover .................................................................................................................... 36
7. HINTS AND TIPS ............................................................................................................................. 37
7.1 Water condensation.............................................................................................................. 37
7.2 Defrosting .............................................................................................................................. 37
7.3 On-Off Contact ...................................................................................................................... 37
7.4 Winterizing ............................................................................................................................ 38
5.1 Heat pump season start ........................................................................................................ 38
5.2 Pool cooling at tropical conditions........................................................................................ 39
5.3 Failure reports ....................................................................................................................... 40
5.4 Troubleshooting – save time and money.............................................................................. 43
8. MAINTANANCE & WARRANTY ...................................................................................................... 44
5.5 Maintanance.......................................................................................................................... 44
5.6 Warranty................................................................................................................................ 45

Installation and user manual HP2300/2800 SPLIT INVENTOR
Version: 01/2020 Page 4
HEAT PUMP MICROWELL HP
1. INTRODUCTION
In your hands you hold probably the most advanced and the most efficient heat pump currently
available on the market. This heat pump provides warm water in your pool at lowest possible cost.
The heat pump is manufactured in tightest accordance with related strict standards and norms, in
order to provide high quality operation and long-term reliability.
This Installation and user manual contains all the necessary information about the installation,
operation and maintenance of the heat pump. Please read this Installation and user manual carefully
before you start to use this product. The manufacturer is not responsible for any personal or property
damage due to the improper installation, use or maintenance that is not in accordance with this User
Manual.
This Installation and user manual is an inseparable part of this product; therefore it must be kept in
good condition and must accompany the heat pump.
1.1 Product description
The heat pump is designed exclusively for swimming pool water heating or cooling and maintaining its
temperature on the requested level. Other appropriate application is water temperature conditioning
for fish tanks, wine ciders or horse cooling facilities. These applications should be discussed with local
installer or distributor. Any other form of application is considered inappropriate.
The heat pump achieves the highest efficiency at 15÷35°C air temperature. At ambient air
temperatures lower than -5°C the efficiency of the device decreases and at the temperatures higher
than +40°C the heat pump can get overheated which may result in its malfunction, damage or failure.
Do not use the product out of the designated operational air temperature range which is stated
in
section 3.1 Technical data
.
This heat pump is designed for swimming pools with up to 80 m3- HP 2300 and up to 120 m3- HP
2800 of pool water volume. For proper operations there must be water flow through the exchanger of
the heat pump (within water filtration circuit) in the range of 8-12 m3/h.
The heat pump enables heat gain from the external air surrounding the swimming pool through the
compression – expansion cycles of the heat-carrying liquid. The air is driven by a fan through the
evaporator where it will deliver its heat to the heat-carrying liquid (the air is being cooled at the same
time). The heat-carrying liquid is then delivered to the spirals of the exchanger by the compressor
which pressurises it and thus heats it up. In these spirals, the heat-carrying liquid delivers its heat to
the swimming pool water. From the exchanger there is a cooled liquid flowing to the expansion valve
or capillary where its pressure decreases and it gets cooled down rapidly at the same time. This
cooled liquid flows to the evaporator again where it gets heated by the flowing air. The whole process
runs fully automatically and is monitored by the pressure and temperature sensors. The same
principle is applied when heat pump operates in cooling mode.
Using simple language, a heat pump is able to extract the heat/cold that is present in ambient
environment and leveraged pass it into the pool water. When heating, higher the ambient air
temperature is, more free energy can the heat pump extract and thus reach higher efficiency. At
favourable conditions you pay around 15% of heat, i.e. 85% of heat is free. Please review below
drawing of different ambient air conditions with subsequent efficiencies.
The heat pump efficiency grows by the increasing surrounding air temperature.
It takes some days to achieve the requested swimming pool water temperature. This time period
depends on heat loss and heat gain balance of your pool.
Example factors of heat losses: poor pool construction, used materials, usage of cover, air – water
temperature relationship, fresh water refilling, filtration, etc.
Example factors of heat gains: intensity of sun, winds, orientation of pool, air – water temperature
relationship, etc.
In order to avoid heat loss when the swimming pool is not being used, it is highly advised to use
pool’s cover.

HP2300/2800SPLIT INVENTOR Installation and user manual
Page 5Version:01/2020
HEAT PUMP MICROWELL HP
Ideal water temperature for external pools is considered at levels from 27° to 32°C. This may change
based on particular demands of the user. When setting the desired air temperature higher than 32°C
please review the material characteristics of your pool parts. High water temperature can damage
these materials and contribute to creation of algea. Manufacturer, distributor and reseller do not bear
responsibility resulting from inappropriate heat pump usage.
1.2 Package checking
The unit was delivered in carton box on a wooden palette. Do not accept the package if it shows
signs of damage. If the package appears intact, please unpack the unit and check the content. It
should include the following:
1. The heat pump – condensing unit, the heat exchanger – indoor unit. Please see section
3.4
Description of the basic parts to see how the heat pump looks like
2. This Installation and user manual
3. Four rubber silent blocks
1.3 Waste disposal information
When using this heat pump in the European countries, the following information must be
followed:
DISPOSAL: Do not dispose this product as unsorted municipal waste. It is prohibited to
dispose this heat pump in domestic / household waste. It is prohibited to dispose this
appliance into forests or natural landscape. This could lead into local soil pollution.
Collection of such waste must be treated individually.
DISPOSAL POSSIBILITIES:
1. The municipality has established a collection system where electronic waste can be disposed.
2. When buying a new product, the retailer or the manufacturer may take back the
old appliance free of charge.
3. Old appliance may contain valuable resources which could be sold to scrap
material dealers.
4. Disposal of packaging materials such as carton box or plastic / bubble foil can be
recycled.

Installation and user manual HP2300/2800 SPLIT INVENTOR
Version: 01/2020 Page 6
HEAT PUMP MICROWELL HP
2. SAFETY MEASURES
It is necessary to follow instructions in this Installation and user manual and local regulations in
your country that regulate the installation and usage of this device. Incorrect, improper or
operations contradictory to this Installation and user manual may lead to an injury or property
damage and will lead to loss of warranty. To prevent injury or property damage the following
instructions must be followed:
2.1 Electrical safety
•The device operates at dangerous electrical current.
•Only authorized person with particular electro-technical qualification can manipulate with unit.
•Danger of electrical shock.
•Do not exceed the required power supply.
•Do not turn the device on that shows signs of possible damage such as broken packaging, broken or
otherwise damaged unit’s chassis or cover, smoke, smell, etc.
•It is necessary to use appropriate Residual current circuit breaker (RCD) for connection of the heat
pump to main power supply.
•Do not manipulate with the device with wet hands.
•Do not clean the device with water.
•Before cleaning the device, switch off the circuit breaker of the unit’s power supply.
•Installation, service or repair must be performed by qualified technician.
•When the device is not intended to be used for a longer time, we recommend switching the circuit
breaker of the unit’s power supply off.
•Unit must be installed in vertical position to avoid condensate water to enter electrical part of the
unit.
•It is forbidden to install the unit close to devices that may cause electrical or frequency disturbance
such as welding machines, motors or rotors, WIFI/WLAN routers or repeaters.
•It is forbidden to alter electrical installation of the device. It is also forbidden to alter any other part
or functionality of the device.
2.2 Usage precautions
Do not cover or block the intake or exhaust opening / ventilator and evaporator covers. It
is forbidden to block or cover the intake or exhaust openings with clothes, towels,
buckets, canoes, trees, etc. Such action would lead to a decrease of needed airflow. That
would result in heat pump inefficiency and underperformance, eventually to heat pump
overeat with subsequent security turning off, malfunction, failure or damage. Especially
during bloom months it is highly advised to keep the evaporator fins clean.
•Do not climb up on or sit on the unit.
•Do not place any objects on the top of the unit (e.g. boxes, flower vases, etc.).
•Do not spray any flammable substances into the equipment; this might lead to fire.
•
Do not clean the equipment with aggressive cleaning agents, this might lead to damage or
deformations.
•When cleaning plastic parts do not use any cleaning agents unsuitable for plastic (household
cleaning agents, solvents, bleaching agents, benzene, diluents, rough cleaning powder, cresol,
chemical agents). Instead, sweep the heat pump cover with a soft cloth or a sponge.
•Never throw or insert any objects into any hose or opening.
•The cover is made of metal. Do not manipulate with lighted cigarette, cigarette ashes, or any other
kind of fire in vicinity to this part.
•Use this device exclusively for the intended purpose, as described in t
he attached instruction
manual. Do not use parts which are not recommended.
•Never block the air opening of the product. Protect the air openings from clogging by particles.
•Do not drink or use the condensate water drained from the unit. Do not return the water back to the

HP2300/2800SPLIT INVENTOR Installation and user manual
Page 7Version:01/2020
HEAT PUMP MICROWELL HP
swimming pool. The water may be contaminated with bacteria.
•Children are not allowed to operate, touch or play with the unit.
•Children are not allowed to manipulate with packaging, plastic / bubble foil. Risk of suffocation!
•Prevent the children from injury or harm caused by any manipulation with the unit, its parts or its
packaging. Small parts like screws may be swallowed and cause harm to health.
•Do not leave the children in the swimming pool / at the swimming pool unattended.
•The positioning of the heat pump must be in accordance with the STN 33 2300-7-702 standard, i.e.
it must be placed at least 3,5 m from the swimming pool´s external border.
•For heating/cooling the swimming pool by the heat pump, the filtration pump must run and the
water must flow through the heat exchanger.
•Never turn on the heat pump if it is without water and if the filtration device is not operating.
•Protect the heat pump from freezing. Eliminate the water from the filtration and from the heat
pump’s water heat exchanger and prepare the product for the winter time.
•At low surrounding ambient temperature level (below 10°C) and high relative air humidity level (e.g.
after rain, during the night, etc.), the evaporator may get iced up. Heat pump will automatically
defreeze itself. Its operations or functionality is not harmed but the efficiency decreases.
•Manufacturer does not bear any responsibility concenring damages caused by inappropriate heat
pump selection, installation or application.
•Do not pressurize the water heat exchanger higher than 0.5MPa (2bar). By pressure of 0.5MPa
(5bar) the water heat exchanger gets irreversibly damaged. It is advised to install a security valve
with pressure threshold at 0.5MPa (5Bar) before the heat exchanger.
•Do not apply or use water of higher temperature than 60
°C in water heat exchanger. Water
temperature above 60°C irreversibly damages the water heat exchanger.
•Manufacturer does not bear any responsibility concerning damages caused by inappropriate heat
pump performance and/or model selection, installation or application. Heat pump is considered
undersized in the case it works usually and in long-term more than 18 hours daily. General warranty
void applies for damages on the device or other damages if the device works usually in long-term
more than 18 hours daily.
•The heat pump must be correctly sized for its application.
•
Refrigerant connection between the water and the condensing unit must comply with local
refrigerant regulations. Typically, the refrigerant circuit must be sealed. Manufacturer does not bear
any responsibility for damages caused by incorrect refrigerant works.
2.3 Handling precautions
•Leave the condensing unit in vertical upright position for at least 2 hours before the installation.
•Transport in lying position or turning the device over may harm the compressor resulting in unit’s
malfunction, failure or damage and will lead to loss of warranty.
•The device must be handled with care and special attention avoiding any mechanical damage.
•It is forbidden to apply any improper mechanical force onto the unit. This may cause mechanical
damage to the device.
•It is forbidden to let the device fall freely onto the ground or any solid surface resulting in hard
impact.
•Please notify your reseller or distributor if you suspect that the unit was delivered damaged. Unit
may seem to work well at start but small damage can make the unit go out-of-order in short time.
In such case the unit must be inspected and approved for further use by your reseller.
•Please notify your reseller or distributor if directly after installation you suspect that unit is not
working in perfect order.
•In the case of device failure resulting from improper handling or mechanical damage (impact, hit,
fall, etc.), the manufacturer reserves the right to evaluate the continuity of warranty.

Installation and user manual HP2300/2800 SPLIT INVENTOR
Version: 01/2020 Page 8
HEAT PUMP MICROWELL HP
3. TECHNICAL SPECIFICATION
3.1 Technical data
HP 2300
HP 2800
Air temperature/water temperature
25°C/10°C
25°C/20°C
25°C/10°C
25°C/20°C
Heating output (kW)
20.01
18.89
26.01
24.55
Power consumption (kW)
3.01
3.10
4.00
4.02
Coefficient of Performance (C.O.P.)
6.5
6.1
6.5
6.1
Recommended swimming pool volume (m3) (with
a cover/without a cover) 80/60 120/80
Energy class
A
A
Operating temperature – air (°C)
0 +55
0 +55
Optional swimming pool water temperature range (°C)
+5+40
+5+40
Air flow (m3/h)
5040
5040
Recommended water flow (m3/h)/pressure loss (kPa)
8-10/5-15
8-12/5-15
Feeding voltage/Protection (V/A)
400 / 20/1C
400 / 20/1C
Power supply (Hz)
50-60
50-60
Current-carrying capacity/max. current (A)
6.5/10
9/14
Coverage/Protection
IP X4/by grounding
IP X4/by grounding
Heat exchanger
Titanium
Titanium
Acoustic pressure level dB (A) 1m/2m/4m/8m
56/50/44/38
56/50/44/38
Water circuit connection (mm/inch, thread)
50/ 6/4“ internal
50/ 6/4“ internal
Refrigerant circuit connection (condensing/water unit)
10mm/18mm
10mm/18mm
Max. length of refrigerant connection horizontally (m)
20
30
Max. length of refrigerant connection vertically (m)
15
15
Max. recommended water pipe length (m)
30
30
Max. operational water pressure
0.15MPa (1.5bar)
0.15MPa (1.5bar)
Net unit dimensions (w/h/d) – condensing unit
942/1250/360
942/1250/360
Gross unit dimensions (w/h/d) – condensing unit
1090/1460/465
1090/1460/465
Net/Gross weight (kg) – condensing unit
102/106
102/106
Net unit dimensions (w/h/d) – water unit without box
970 x 275 x 340
970 x 275 x 340
Gross unit dimensions (w/h/d) – water unit without
b
1095 x 585 x 465
1095 x 585 x 465
Net/Gross weight (kg) – water unit without box
17/25
17/25
Net unit dimensions (w/h/d) – water unit with box
1045 x 370 x 430
1045 x 370 x 430
Gross unit dimensions (w/h/d) – water unit with box
1095 x 585 x 465
1095 x 585 x 465
Net/Gross weight (kg) – water unit with box
37.5/45
37.5/45
Refrigerant/filling weight (type/kg)
R410A 2800g 5.85t CO2
ekv.
R410A/ 3000g 6.26t CO2
ekv.
* The manufacturer reserves the right to change the parameters without notice.
** In the case Winter module, condensate tray antifreeze or heat exchanger frost protection is installed.
The refrigerant circuit is filled with R410A refrigerant that consists of 2 components (R32/R125).
These components are considered as fluorocarbon greenhouse gases. The product contains
fluorocarbon greenhouse gases listed in the Kyoto Protocol:
R410A with the global warning potential (GWP) 1720 (R-32/125 50/50) CH2F2 + CF3CHF2.
Based on EU regulation 842/2006 there is an obligation to perform a refrigerant revision
on your heat pump once a year. Please contact your distributor, reseller or installater.

HP2300/2800SPLIT INVENTOR Installation and user manual
Page 9Version:01/2020
HEAT PUMP MICROWELL HP
3.2 Swimming pool water parameters
The heat pump is designed for heating the swimming pool water. Although the water heat exchanger
is made from the most durable titanium, in order to ensure long term reliability of the heat pump the
pool water must be in accordance with the related sanitary requirements.
The limit values for the heat pump operation are the following:
-pH value ranging from 6.8 to 7.9,
-total chlorine amount not exceeding 3 mg/l,
-salt content 6% wt/wt.
Should you have different values of pH, chlorine or salt please try to apply appropriate agents or
contact your swimming pool builder to resolve the situation. Above mentioned values are
recommended for pools in general.
It is also advised to keep the water hardness on the lower limit of the optimal range, i.e. closely above
8 °N.
3.3 Heat pump dimensions
3.4 Description of the basic parts
CONDENSING UNIT
Note: The
illustrations and
descriptions found in this
Installation and user
manual are
not binding. The manufacturer
reserves the right to make
corrections or changes without
notice.
2
1
3
5
4
6
7
8

Installation and user manual HP2300/2800 SPLIT INVENTOR
Version: 01/2020 Page 10
HEAT PUMP MICROWELL HP
Legend: 1 – Protecting grates of the fan (air outlet) / ventilator cover
2– Cover / metal chassis
3– Control panel (if on condensing unit)
4– Valve for refilling the refrigerant (under the cover)
5– Power supply connection (underneath the cover)
6– Evaporator (air inlet)
7– Refrigerant connection IN (water unit OUT) – liquid (heating mode)*
8 – Refrigerant connection OUT (water unit IN) –gas (heating mode)*
*- in cooling mode applies in reversed order
WATER UNIT – Hydro kit (without box) WATER UNIT – Hydro kit (with box)
Legend:
1 – Heat exchanger body
2– Water inlet connection hub
3– Water outlet connection hub
4– Refrigerant connection OUT (condensing unit IN) – liquid (heating mode)*
5– Refrigerant connection IN (condensing unit OUT) – gas (heating mode)*
6– Wall console to be fixed on a wall
7– Flow switch
8– Temperature sensor water in (T2)
9– Temperature sensor water out (T5)
10 – Electro box
11 – Heat exchanger box
12 – Controller (if on water unit)
13 – A,B,C,D connector for controller (if on water unit)
14 – Electro box on ‘L’ shaped metal plate to be fixed on a wall
*- in cooling mode applies in reversed order
Please note that above pictures may differ from your actual heat pump make.
3
6
1
5
4
7
9
13
14
11
2
4
5
10
8
12

HP2300/2800SPLIT INVENTOR Installation and user manual
Page 11 Version:01/2020
HEAT PUMP MICROWELL HP
3.5 Security and control systems
In order to ensure long term reliability and fully automatic operations of the heat pump, the pump is
pump is equipped with following security systems:
Temperature based control of the heat pump operation:
The heat sensor placed on the heat exchanger, ensures switching off of the heat pump when
the requested water temperature is reached. The normal operating mode gets renewed if the
water temperature in the exchanger drops by 3 °C (manufacturing setting) below the
requested value.
Safety systems:
Water flow sensor (flow switch) placed on the water heat exchanger inlet.
The water flow sensor switches on the heat pump when there is water flowing through the
heat pump exchanger, and switches it off when the water flow stops or is too high or low.
Sensor of the minimal and maximal gas pressure in the refrigerant circuit.
Heat sensor on the refrigerant outlet from the compressor.
Time protection
The unit is equipped with a switching time delaying device with a preset 3 minutes delay
period for protecting the control elements in the circuit and eliminating repeated restarts and
contactor vibrations. This time delay will automatically restart the unit app. 3 minutes after
every single interruption of the heat pump operation. Even if there is only a short interruption
of the power supply, the time protection will get activated so the unit cannot start the
operation earlier than the pressures in the refrigerant circuit of the heat pump get balanced.
Interruption of the power supply during the pause time does not influence the time interval.
Antifreeze protection
If an ambient air temperature is low (e.g. below 7°C), it is normal to have ice creations on the
evaporator of your heat pump. This is freezing condensated water. Your heat pump is
equipped with automatic defrosting.
Manufacturer has preset the conditions when automatic defrosting gets activated in order to
ensure optimal operations and performance of the heat pump. For more information please
refer to section 5.8 Setting of the operating parameters and section 7.2 Defrosting .
If your heat pump freezes up on often basis it is advised to reconsider the efficiency of heat
pump running (heating) in such conditions.
If a failure occurs to any of above systems there will be an error message shown on the display
starting with ‘EE’. Please check
section 7.7 Failure reports of this Installation and user manual.
Warning: Elimination or disabling from operation any of the control or security systems results in
warranty void.

Installation and user manual HP2300/2800 SPLIT INVENTOR
Version: 01/2020 Page 12
HEAT PUMP MICROWELL HP
3.6 Block wiring diagram of the PCB board – Display on condensing
unit
Notice: Manufacturer reserves the right to change electrical wiring without notice.
CIRCULATION
PUMP
max. 2.2A/500W
MAIN POWER
SUPPLY

HP2300/2800SPLIT INVENTOR Installation and user manual
Page 13 Version:01/2020
HEAT PUMP MICROWELL HP
3.7 Block wiring diagram of the PCB board – Display on water unit
Notice: Manufacturer reserves the right to change electrical wiring without notice.
MAIN POWER
SUPPLY
CIRCULATION
PUMP
max.
2.2A/500W

Installation and user manual HP2300/2800 SPLIT INVENTOR
Version: 01/2020 Page 14
HEAT PUMP MICROWELL HP
3.8 Block wiring diagram legend
T1 – Evaporator temperature / defrost sensor
T2 – Inlet water temperature
T3 – Ambient air temperature
T4 – Discharge temperature
T5 – Outlet water temperature
T6 – Suction temperature
T7 – Water heat exchanger pipe temperature
OUT1 – Compressor (RY1)
OUT2 – 4-way valve
OUT3 – Fan
OUT4 – Circulation pump
OUT5 – Compressor body solenoid valve
OUT6 – Heat pump cleaning
OUT7 - Heat 1- Heating element of heat exchanger
OUT8 - Heat 2 – Heating element of compressor body
OUT9 - Heat 3 – Heating element of condensate tray
L(h)N – connection of heat exchanger heating spiral
L(P)N G –connection of circulation pump control, max. 2.2A, max. 500W
A B C D – connection of display
1 2 3 4 5 - connection of water exchanger sensors (alterantive 1234) with T7 inside the unit
L N G – main power supply
Dry contact On/off – contact only, no voltage, no current!
Sensor specification
T1 – Evaporator temperature
5kohm
Copper head
T2 – Inlet water temperature
5kohm
Copper head
T3 – Ambient air temperature
5kohm
Plastic head
T4 – Discharge temperature
50kohm
Copper head
T5 – Outlet water temperature
5kohm
Copper head
T6 – Suction temperature
5kohm
Copper head
T7 – Water heat exchanger pipe
temperature
5kohm
Copper head

HP2300/2800SPLIT INVENTOR Installation and user manual
Page 15 Version:01/2020
HEAT PUMP MICROWELL HP
4. HEAT PUMP INSTALLATION AND CONNECTION
4.1 Positioning
The heat pump is designed for outdoor installation. It must be installed on a stable and levelled base.
The pump can be installed in vertical position only.
a)
The condensing unit should be installed in spaces where it can
have sufficient supply of fresh ambient air. Do not install the
condensing unit in closed spaces with limited air access
and where the air cannot circulate sufficiently. The air
inlet and outlet must be completely accessible. The condensing
unit should have minimal distances from surrounding objects as
shown on picture on the right. Do not put the condensing unit
near bushes or trees either, as these can also influence the air
access. Every single barrier of free air flow reduces the
efficiency of the heat pump and may lead to heat pump’s
malfunction, damage or failure.
b) Although the condensing unit is designed for exterior installation (sunlight, rain, snow) it is
suggested to make a shelter / roof in order to protect its metal parts and thus ensure long term
stability of color, metal chassis, etc.
c) Do not install the device near road networks, as increased concentration of dust gradually
decreases the heat exchange effectiveness.
d)When the condensing unit is in full heating operation, it generates considerably colder air than
ambient air temperature. It is thus advised not to install the condensing unit at places, where
cold air flow could cause any inconvenience (windows, terraces, etc.). Also, do not place the air
outlet against the dominant winds.
e) The distance between the water unit and the condensing unit can be max. 20m horizontally and
max. 15m vertically (condensing unit above water unit). Split heat pump was designed to
provide with water temperature control of a pool and in the meantime provide no visual and/or
acoustic disturbance to a pool user. It is thus advised to install the condensing unit away from
the pool to a place where it will not be ‘seen and/or heard’.
f) The condensing unit must be placed on a flat, stable and levelled surface. The pump housing
must be fixed to this surface with screws and rubber anti-vibration elements (silent blocks).
Rubber anti-vibration elements not only reduce the noise level of the heat pump, but also help
to eliminate the vibrations and thus they contribute to smoother heat pump operations and long
term reliability. Please note that the condensing unit should be installed above the closest
terrain level to allow the condensation water leak out of the heat pump. Please refer to
section
7.1 Water condensation
.
v
g)The surface of the evaporator consists of aluminum fins. The fins are soft and can get
mechanically damaged very easily. Please be careful when manipulating with the unit to avoid
any damage.
h)It is advised to install the condensing unit on a stand 300-500mm above
surrounding ground.Heat pump installed directly on a surrounding ground can by
easily immersed into snow and/or into frozen condensation. This can decrease heat pump’s
efficiency and performance and lead to heat pump malfunction, damage or failure.
Notice: Please discuss particular details of heat pump positioning and connection to the swimming
pool water circuit with your swimming pool builder, distributor or reseller!
Picture: Minimal distances from surrounding
objects.

Installation and user manual HP2300/2800 SPLIT INVENTOR
Version: 01/2020 Page 16
HEAT PUMP MICROWELL HP
4.2 Connection to water filtration circuit
The heat pump must be connected to water circuit (filtration circuit) of the swimming pool in order to
provide desired heating/cooling performance. The water flow through the exchanger of the heat pump
must be in accordance with the designed value (
see chapter 3.1 Technical data ). Normally the heat
pump is connected through a by-pass. It is then possible to adjust the water flow accordingly as
filtration pumps may have different water flow performances.
The by-pass consists of 3 valves connected as shown in the picture below. Water normally flows from
the filtration pump (right side) to the swimming pool (left side) through Valve 1. Heat pump is
connected through Valve 2 (heat pump inlet) and Valve 3 (heat pump outlet).
Complete closure of Valves 2 and 3 with Valve 1 fully open means no water flow through the heat
pump which means no heating or cooling provided by the heat pump.
Complete closure of Valve 1 with Valve 2 and 3 fully open means maximum amount of water flowing
through the heat pump.
Normally the by-pass is set as shown on below picture.
The heat pump is equipped with 2 threads enabling the connection of input and output fitting (d50).
For connection with the filtration circuit use the d50 PVC pipe or 50/38mm adapters (6/4”). Please
refer
to section 3.4 Description of the basic parts in order to make sure which thread is water input
and which water output. It is advised to apply lubricating oil on threads before tightening the
connection.
Please consider using fast connector for the heat pump inlet and outlet in order to make the
disconnection of the heat pump from the rest of the filtration circuit simple (for water draining from
the heat pump before winter time and for service purposes).
The heat pump must be connected to the filtration circuit of the swimming pool behind the filter and
in front of the device for water conditioning (automatic chlorine dozing machine, ozone machine).
For illustration please refer to Scheme: Connection of the split heat pump into the water
filtration circuit of the swimming pool on page 16.
Note:In case of using the automatic chlorine dozing machine in the filtration circuit it is
necessary to install a backward titanium spring in front of it. If this valve is missing, by shutting
down the filtration, the chlorine concentration around the heat pump exchanger may be
increased to critical level and exceed the allowable level (3 ppm) causing damages.
Back to the swimming
pool
From the filtration
pump / swimming
pool
Connection of the by-pass
VALVE 1
VALVE 2
VALVE 3
To the heat pump
From the heat pump

HP2300/2800SPLIT INVENTOR Installation and user manual
Page 17 Version:01/2020
HEAT PUMP MICROWELL HP
4.3 Needed components for connection to water circuit
It is advised to use hose nut with external thread PN16 50 x 6/4” and a pressure hose D50 or PVC
pipe D50. Particular component selection depends on individual condition at your pool. Your seller,
distributor or pool builder may decide on how the actual connection is performed. These
components are not part of heat pump package or delivery.
Sample connection scheme and application example
Important: For proper operations, there must be a water flow through the heat pump
exchanger in range of 8-10 m3/hour (HP2300) or 8-12 m3/hour (HP2800). In
the case of water flow exceeding 12m3/h the heat pump will turn itself off and an
error notice EE5 will pop up. Repeated error notice or repeated exposure of the heat
pump to the water flow higher than 12m3/h will cause irreversible damage to flow
switch with permanent error notice EE5. The heat pump will be turned off. Please
contact your distributor or service department, the flow switch needs to be replaced.
Flow switch will also turn the heat pump off in the case of the water flow lower than
5m3/h. This is set up in order to protect the heat pump against overheating. Exception
is cooling at tropical conditions. Please see 7.6 Pool cooling at tropical conditions.
Picture: Pressure hose
D50
Error code ‚EE5‘ advising of low / high water
flow or damaged flow switch.
Picture: Hose nut with external thread PN16.
G=6/4” D=50mm
Picture: PVC pipe, various
dimesions
Picture: Sample water connection to the heat pump. Flexible hose glued
onto hose nut adapter with external thred that is tightened into the heat
pump exchanger thread. Picture is illustratory.

Installation and user manual HP2300/2800 SPLIT INVENTOR
Version: 01/2020 Page 18
HEAT PUMP MICROWELL HP
Scheme: Connection of the split heat pump into the water filtration circuit of the
swimming pool
Note: The manufacturer supplies the heat pump only. The other parts and components shown in the
picture are not included in heat pump package.
Swimming
pool
Skimmer
Chlorine
dozing
machine
Reversible
nozzle
Bottom
outlet
Filtration
pump
By-pass
valves
Technical chamber
min. 3500mm
Heat pump
AIR unit
min.
500mm
Wall
Condensate
outlet
Heat pump
WATER unit
4 way
valve
Filtration
tank
Gas circuit piping
with sensor cables

HP2300/2800SPLIT INVENTOR Installation and user manual
Page 19 Version:01/2020
HEAT PUMP MICROWELL HP
4.4 Electrical connection
IMPORTANT: The electric connection of the heat pump can only be
performed by an authorized electrician in accordance with local electrical
standards and requirements.
WARNING: The device operates at dangerous electrical current and
voltage.
DANGER: Danger of electric shock!
a) The heat pump must be connected through a single circuit-breaker specified in section 3.1
Technical data
for a particular model. The dimensioning of the power supply must be sufficient
(the suggested cross section of the conductors is 5 x 2,5 mm2). It is important to make sure and it
is nonconditionned requirement of the manufacturer to install the heat pump together with RCD
(Residual Circuit Breaker) with the actuating current up to 30mA. The power supply
characteristics (voltage, phase and frequency) must be in complete compliance with the operating
parameters of the device (please refer
to section 3.1 Technical data ).
b) The electric connection must be performed by an authorized electrician and must be in accordance
with the valid local electro-technical requirements.
c) The electric installation of the heat pump must be grounded appropriately. The grounding
distributor´s impedance must be in compliance with local valid electro-technical requirements.
d) The electro connection of the heat pump must be simple, clear and comprehensible. It is highly
advised to have the connection performed in a way that would allow a third party electrician to
understand the connection at no time. Unnecessary cross connections are not appropriate.
e) It is important to carefully check and measure the electric installation before putting it into live
operation.
f) The suggested protection is stated in the chart below:
Heat pump model
HP 2300
HP 2800
RCD parameters
Current-carrying
capacity
20 A/C 20 A/C
Actuating current
30 mA
30 mA
Circuit breaker characteristic
20 A/C
20 A/C
g) Block wiring diagram is included
in section 3.6 Block wiring diagram of the PCB board .
h) In order to protect the unit from weather anomalies it is recommended to install power surge
protection class 1. B+C+D.
Note: Should above points a) to h) be in contrary with local electrical standards or requirements,
please contact your distributor or reseller.
4.5 Refrigerant circuit connection
Split heat pump requires refrigerant circuit connection in order to operate normally. This is normally
done during installation of the pump as the pump comes with separate (not connected) condensing
and water units refrigerant-wise originally from the factory. Refrigerant circuit must be sealed.
IMPORTANT: Please note that refrigerant connection can be performed by
an authorized person only. The person must have a valid refrigeration licence.

Installation and user manual HP2300/2800 SPLIT INVENTOR
Version: 01/2020 Page 20
HEAT PUMP MICROWELL HP
Condensing unit is pre-precharged with refrigerant R410A from the factory. The amount is
based on order specification regarding length between water and condensing units. Normally the
condensing unit is pre-charged for 10m refrigerant connection by factory according to order by your
distributor or reseller. Should this have not been specified at order with the factory, certain amount of
refrigerant must be added to the system per each meter exceeding 10m of connecting distance.
Please note that it is needed to add 50g of R410A per 1 meter
for exceeding connecting distances between condensing and
water unit.
Piping length and elevation
Heat
pump
model
Pipe size
Factory
pre-
charged
connection
distance
Max.
vertical
distance
(B)
Max.
distance
(A)
Additional
refrigerant
Gas (diameter) Liquid
(diameter)
inch
mm
inch
mm
HP2300
HP2800
3/4 18 3/8 10 10m 15m 20m 50g/m
Refrigerant piping – condensing unit
1. Align the center of the pipings and
sufficiently tighten the flare nut by hand.
Please do so for both gas and liquid pipes.
When heating gas pipe has bigger
diameter and liquid pipe has smaller
diameter. When cooling reversed order
applies.
2. Tighten the flare nuts with torque
wrench until the wrench clicks. Please
make sure that the direction for tightening
follows the arrow on the wrench.
Please review below table for torque force.
Condensing
unit
Water unit
Water unit
Condensing unit
Gas
side
Liquid
side
Torque
wrench
Please use refrigerant copper pipes with
insulation only.