MICROWELL HP 2400 COMPACT Premium User manual

Version: 01/2018
HEAT
PUMP
for swimming pool water
heating & cooling
HP 2400 COMPACT Premium
&
HP 3000 COMPACT Premium
jún 2011
Installation and user manual

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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.......................................................................................... 8
3.3 Heat pump dimensions ........................................................................................................... 9
3.4 Description of the basic parts.................................................................................................. 9
3.5 Security and control systems ................................................................................................ 10
3.6 Block wiring diagram of the PCB board................................................................................. 11
4. HEAT PUMP INSTALLATION AND CONNECTION............................................................................ 12
4.1 Positioning............................................................................................................................. 12
4.2 Connection to water filtration circuit.................................................................................... 13
4.3 Needed components for connection to water circuit........................................................... 14
4.4 Electrical connection ............................................................................................................. 16
4.5 Multiple heat pump connection............................................................................................ 16
4.6 Control of the circulation pump............................................................................................ 17
4.7 Separate water circuit ........................................................................................................... 18
4.8 Circulation pump connection ................................................................................................ 18
5. REGULATION.................................................................................................................................. 19

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5.1 Description of the LCD panel................................................................................................. 19
5.2 General heat pump control................................................................................................... 20
5.3 Heat pump operational modes ............................................................................................. 21
5.4 Timer ..................................................................................................................................... 21
5.5 Child lock ............................................................................................................................... 22
5.6 Parameters check.................................................................................................................. 22
5.7 Setting of the operating parameters..................................................................................... 23
6. ACCESSORIES ................................................................................................................................. 24
6.1 Winter module ...................................................................................................................... 24
6.2 Heat exchanger frost protection ........................................................................................... 24
6.3 Condensate tray defrost........................................................................................................ 25
6.4 Protection cover.................................................................................................................... 25
7. HINTS AND TIPS ............................................................................................................................. 25
7.1 Water condensation.............................................................................................................. 25
7.2 Defrosting.............................................................................................................................. 25
7.3 Winterizing ............................................................................................................................ 26
7.4 Heat pump season start ........................................................................................................ 27
7.5 Failure reports ....................................................................................................................... 28
7.6 Troubleshooting –save time and money.............................................................................. 30
8. MAINTANANCE & WARRANTY ...................................................................................................... 31
8.1 Maintanance.......................................................................................................................... 31
8.2 Warranty................................................................................................................................ 32

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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 2400 and up to 120 m3- HP
3000 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.

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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 –one compact piece. Please check section 3.4 Decription 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.

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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 the 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

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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 2000-7-702 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 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.
Do not pressurize the water heat exchanger higher than 0.15MPa (1.5bar). By pressure of 0.2MPa
(2bar) the water heat exchanger gets irreversibly damaged. It is advised to install a security valve
with pressure threshold at 0.15MPa (1.5Bar) before the heat exchanger.
Do not apply or use water of higher temperature than 40°C in water heat exchanger. Water
temperature above 45°C irreversibly damages the water heat exchanger.
2.3 Handling precautions
Leave the 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.

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3. TECHNICAL SPECIFICATION
3.1 Technical data
HP 2400
HP 3000
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)
-5(-15)** +40
-5(-15)** +40
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
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
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)
942/1550/360
942/1550/360
Gross unit dimensions (w/h/d)
1090/1760/465
1090/1760/465
Net/Gross weight (kg)
118/122
120/124
Refrigerant/filling weight (type/kg)
R410A/3.20; 6.7t CO2 ekv.
R410A/3.60; 7.5t 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.
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.

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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
Legend: 1 –Protecting grates of the fan (air outlet) / ventilator cover
2–Cover / metal chassis
3–Control panel
4–Valve for refilling the refrigerant (under the cover)
5–Power supply connection (underneath the cover)
6–Water outlet connection hub
7–Water inlet connection hub
8 –Evaporator (air inlet)
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

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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 5.7 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 5.1 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.

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3.6 Block wiring diagram of the PCB board
FM1
CM
Fan 1
Compressor
4-way
valve
OUT 3 4 5 6 7
PCB board
OUT2
OUT1
CN4
CN6
CN7
CN2
Flow switch
Connector
A, B, C
Transformer
Display
Heat pump power
supply
L
Circulation
pump
connection
230VAC
max. 700W
Sensors
T5
T4
T3
T2
T1
Picture: Power supply connection of the heat pump and
of the auxiliary circulation pump.
Please note that
phases can be marked
by either R,S,T or 1,2,3
(R=1, S=2,T=3).
Pressure switch
Fan 2
FM2
L
N
Fan capacitor 1
Fan capacitor 2
N
1
2
3
4
R
S
T
N
Phase
monitor
N R S T
Power
relay
Legend:
FM –Fan motor (1 and 2)
CM - Compressor
OUT 1 –Power relay
OUT 2 –N/A
OUT 3 –output of 4-way valve L
OUT 4 –output of 4-way valve
OUT 5 - fan L
OUT 6 –circulation pump L
Sensors:
T1 –Evaporator / defrosting
T2 –Inlet water temperature
T3 –Ambient air temperature
T4 –Compressor discharge
temperature
T5 –Outlet water temperature
Connectors for
Split version (not
applicable for
Compact model)
/1,2,3,4/.
Notice: Manufacturer reserves the right to
change electrical wiring without notice.

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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 heat pump should be installed in spaces where it can have
sufficient supply of fresh ambient air. Do not install the heat
pump in closed spaces with limited air access and where
the air cannot circulate sufficiently. The air inlet and outlet
must be completely accessible. The heat pump should have
minimal distances from surrounding objects as shown on picture
on the right. Do not put the heat pump 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 heat pump 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 heat pump is in full heating operation, it generates considerably colder air than ambient
air temperature. It is thus advised not to install the heat pump 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 swimming pool edge and the heat pump should not exceed 30 m.
Please note that the longer interconnecting water piping is, the higher heat loss occurs, i.e.
lower heating output and less efficiency is achieved. Practically this results in longer heating
times and higher electricity bill. It is not advised to install the heat pump very close to
swimming pool water surface.
f) The heat pump 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 heat pump 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 .
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.

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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 compact heat pump into the water
filtration circuit of the swimming pool on page 15.
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

I n s t a l l a t i o n a n d u s e r m a n u a l H P 2 4 0 0 / 3 0 0 0 C o m p a c t
V e r s i o n : 01/ 2 0 1 8 P a g e 14/ 2 8
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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 (HP2400 ) or 8-12 m3/hour (HP3000 ). 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.
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.

HP240 0 / 3 0 0 0 C o m p a c t I n s t a l l a t i o n a n d u s e r m a n u a l
P a g e 15/ 2 8 V e r s i o n : 0 1 / 2 0 1 8
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Scheme: Connection of the compact 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.
WALL (fence, house)
HEAT PUMP
Water outlet
Water inlet
Air suction
Exhaust air
By-pass valves
Skimmer
SWIMMING POOL
TECHNOLOGICAL
CHAMBER
Water supply from water mains
Water discharge
Condensate drain
Filtration tank
Filtration valve
Filtration pump
Bottom outlet
Reversible nozzle
Chlorine dozing machine

I n s t a l l a t i o n a n d u s e r m a n u a l H P 2 4 0 0 / 3 0 0 0 C o m p a c t
V e r s i o n : 01/ 2 0 1 8 P a g e 16/ 2 8
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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 2400
HP 3000
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 Multiple heat pump connection
Sometimes it is necessary to install multiple heat pumps into a single swimming pool in order achieve
requested water temperature. Such installation is particularly advised on public venues where
continuity of operation / service is paramount.
Installation of the multiple heat pumps follows the same procedure as single heat pump described
above. It is only necessary to install the heat pumps in parallel connection. Serial connection would
significantly decrease the heating/cooling capacity and efficiency of heat pumps second in line. It is
advised to insert individual valves into connecting water piping for each single heat pump. This will

HP240 0 / 3 0 0 0 C o m p a c t I n s t a l l a t i o n a n d u s e r m a n u a l
P a g e 17/ 2 8 V e r s i o n : 0 1 / 2 0 1 8
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simplify the particular heat pump by-pass (disconnection) in the case of reinstallation, testing or
service. Please refer to below illustration.
By multiple heat pump connection it is possible have all the heat pumps always on and running
when heating / cooling is required or to have the heat pumps gradually turning on and off so at
certain conditions (e.g. when requested water temperature is few degrees off the current water
temperature) not all the heat pumps would run. Gradual turning on and off is achieved by setting the
different requested water temperatures on multiple heat pumps. For example:
Heat pump 1 30°C
Heat pump 2 28°C
4.6 Control of the circulation pump
Microwell swimming pool heat pump is able to control the circulation pump. In principle should the
heat pump be in need for heating/cooling it will automatically turn the circulation pump on.
In order to enable this control, the circulation pump must be connected to the heat pump electrically
(please refer to section 3.6 Block wiring diagram of the PCB board ). Normally the circulation pump is
controlled by a time control of the filtration. It is thus advised to make the parallel connection
through power relay enabling both sources of regulation (by the heat pump and by the time
control).
Please note that both heat pump (phase R or 1) and the time
control must be powered by the same single phase!
Please be advised that when circulation pump control is enabled and electrically connected with the
heat pump, it is normal to have a situation when both the heat pump and the time control give
command to circulation pump to operate at the same time. It is thus strictly forbidden to power
the heat pump (phase R) and the time control by different phases!
The control is available in three modes:
1. Periodical mode
Heat pump will turn the circulation pump on only when it needs to heat or cool (i.e. requested water
temperature is off the current temperature by at least 2°C).
Periodical mode can be set in manufacturing settings number 07, figure 0. (please refer to section
5.7 Setting of the operating parameters )
Periodical mode is also equipped with sampling, i.e. regular water temperature reading. Practically
this means that as soon as the heat pump reaches requested temperature it turns itself and the
Heat pump number 1
Heat pump number 2
Swimming pool
Filtration
tank
6-way
valve
Circulation
pump
By-pass for
heat pump
Main by-pass

I n s t a l l a t i o n a n d u s e r m a n u a l H P 2 4 0 0 / 3 0 0 0 C o m p a c t
V e r s i o n : 01/ 2 0 1 8 P a g e 18/ 2 8
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circulation pump off. In the case the water temperature will not trigger the heat pump in following
60 minutes, the heat pump will automatically turnt the circulation pump on for a 1 minute time in
order to recirculate water from to the pool into the heat exchanger in order to read the actual
current water temperature.
2. Continous mode
In continuous mode will the heat pump have the circulation pump turned on and running all the
time the heat pump is in operational mode (please refer to section 5.2 General heat pump control
for explanation of operational mode).
Continous mode achieves better water temperature readings but means higher energy
consumption of the system as the circulation pump is always on.
Continous mode can be set in manufacturing settings number 07, figure 1. (please refer to section
5.7 Setting of the operating parameters )
3. microECONOMY+ Mode
microECONOMY+ mode provides optimum water temperature conditioning at lowest cost. Heat
pump will have the circulation pump running only in time when the heat pump needs to heat or
cool the water. Once the requested water temperature is achieved the heat pump goes into sleep
for 30 minutes. After these 30 minutes are passed, the heat pump will have the circulation pump
running for about a minute to receive actual accurate water temperature. Should heating or
cooling be required, the heat pumps starts. Should no action be required, the heat pump goes
into 30 minute sleep again. This 30 minute period can be cancelled by pressing any button on the
controller.
microECONOMY+ mode can be set in manufacturing settings number 07, figure 2. (please refer to
section 5.7 Setting of the operating parameters )
Please note that all heat pump models may not be equipped with microECONOMY+ mode.
4.7 Separate water circuit
In order to save energy it is possible to install the heat pump on a separate water circuit with small
circulation pump. This is appropriate in the case the power consumption of circulation pump for
filtration is considered high or simply if the whole filtration circuit running is not desired when heating
/ cooling is required.
Normally swimming pool circulation pumps with water flow performance between 8-12m3/h consume
up to 1kW of energy.
Such installation must be discussed with your swimming pool supplier, distributor or reseller.
4.8 Circulation pump connection
Manufacturer suggests connection of circulation pump through switching relay. Please refer to below
drawing for more information. Direct connection of the circulation pump is not advised.
HEAT PUMP
Circulation pump
connection
Switching phase 230VAC
Relay 230VAC
Circulation pump power supply
Circulation
pump

HP240 0 / 3 0 0 0 C o m p a c t I n s t a l l a t i o n a n d u s e r m a n u a l
P a g e 19/ 2 8 V e r s i o n : 0 1 / 2 0 1 8
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5. REGULATION
5.1 Description of the LCD panel
Cooling symbol
-Heating symbol (lit
contantly)
-Defrosting (blinking)
AUTO mode symbol
General indication
Screen lock
(displayed when
child lock is applied)
Indication of
manufacturing’s
settings
Current water
temperature
Requested water
temperature
Main power on/off
button.
-Mode change (heating,
cooling, auto mode)
-Operational parameters
setttings
Up / down
selection,
water
temperature
settings
Timer (displayed
when timer is
activated with preset
time-out period)
Timer –heat pump
to turn itself on/off
(displayed when
timer is activated)
Checking of technical
parameters
Forced
defrosting
Water pump modes
indicator
Defrosting (blinking)

I n s t a l l a t i o n a n d u s e r m a n u a l H P 2 4 0 0 / 3 0 0 0 C o m p a c t
V e r s i o n : 01/ 2 0 1 8 P a g e 20/ 2 8
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5.2 General heat pump control
After the installation, the heat pump is to be controlled by digital display only. Directly after
installation with still no power supply to your heat pump, the digital controller will be blank. This
means a complete shut down of the heat pump.
When heat pump receives required power supply, for a moment the display will show all its
indications.
After few moments the heat pump will go into STAND-BY mode. This means that the heat pump is off
but it is connected to the mains at the same time. The display will show the mode of the heat pump
(in below picture a triangle that indicates AUTO mode) and the current water temperature, in below
particular case 30°C.
By pressing the main power on/off button you can turn your heat pump on to OPERATIONAL
mode. The display will show the mode of the heat pump (in below picture a triangle that indicates
AUTO mode), requested or desired water temperature on the left, showing 30°C in below picture, and
current water temperature on the right, showing 30°C.
You are able to set the requested water temperature. By pressing the up and down
buttons the requested water temperature increases or decreases by 1°C. You will see immediate
change of desired temperature on the left. The preset water temperature range is +5°C ~ +40°C.
Note: Some heat pump models require confirmation of requested water temperature if
changed. This is done by pressing the main power on/off button .
By pressing the M button you can change the operational mode of the heat pump. Please refer to
section 5.3 Heat pump operational modes of this Installation and user manual.
By pressing the main power on/off button you can turn your heat pump off.
Picture: Blank display indicates no power supply and
complete shutdown of the heat pump.
Picture: Display showing all its indication for a moment only when
the heat pump receives power supply.
Picture: Stand-by mode.
Picture: Operational mode.