Hotjet MINI 5Ai User manual

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Heat pump installation
HOTJET MINI 5Ai
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Table of contents:
1. Read this first! 3
1.1. Important notes 3...................................................................................................................................................................................................
1.2. What has the heat pump been design for? 3.......................................................................................................................................................
1.3. Legal regulations 3.................................................................................................................................................................................................
1.4.Economical operation conditions 4.........................................................................................................................................................................
2. Use of the heat pump 4
2.1.Usage area 4...........................................................................................................................................................................................................
2.2. Operation principle 4..............................................................................................................................................................................................
3. Content of the delivery 5
3.1. Heat pump 5...........................................................................................................................................................................................................
4. Control box with regulation 5
5. Accessories 5
6. Transport and storage 5
6.1. Transport 6.............................................................................................................................................................................................................
6.2. Storage 6................................................................................................................................................................................................................
7. Installation 6
7.1. Installation location 6..............................................................................................................................................................................................
7.2. Wall installation 6...................................................................................................................................................................................................
7.3. Air intake and exhaust 8.........................................................................................................................................................................................
7.4. Air vents 8...............................................................................................................................................................................................................
7.5. Noise and vibrations 8............................................................................................................................................................................................
7.6. Load bearing capacity of the structure 8...............................................................................................................................................................
7.7.Condensate discharge 8.........................................................................................................................................................................................
7.8. Connection to a heating system 9..........................................................................................................................................................................
7.9. Safety valve 9.........................................................................................................................................................................................................
7.10. Protection against freezing 9................................................................................................................................................................................
8. Electric connection 9
9. Disassembly of the heat pump cover 10
10.Putting the heat pump into operation 10
10.1. Preparation for putting into operation 11..............................................................................................................................................................
10.2. Heating system filling procedure 11.....................................................................................................................................................................
10.3. Putting the heat pump into operation 11...............................................................................................................................................................
11. Regular maintenance 11
11.1. Inspection prior to the heating season 12.............................................................................................................................................................
12.Defects and how to locate them 12
13.Disassembly and liquidation 12
14.Circulation pump parameters 13
15.Parameters of the 3-way valve 13
16.Built-in electric boiler 13
17.Hydraulic integration 14
18.Warranty, Post Warranty Terms and Conditions and Liability for Defect 15
19.EC declaration of conformity to the heat pump 16
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1. Read this first!
Congratulation on your purchase of the Hotjet heat pump. To
maximize the time the heat pump will work for you, you should
familiarize yourself with its manual.
The heat pump is a compact unit designed for heating hot water
and for heating. It is equipped with a frequency converter and
adjusts the heating and cooling power output to immediate
needs.
The heat source is air or brine and the heat collected from it is
transferred to the water in the exchanger.
The heat pump is a product with a long lifespan and it is very
safe.
We wish you a problem-free operation and thermal comfort.
1.1. Important notes
⚠Immediately examine the condition and content of the
delivery as soon as you receive the heat pump from the
given shipping company. You usually have a maximum of
3 days to exercise any warranty claims related to the
transport!
⚠Observe the corresponding legal regulations valid in the
country of the pump installation during the pump
assembly, operation and maintenance.
⚠Starting with a certain volume of the used coolant, the
pump has to be revised for its tightness and possible
coolant leakages (observing the specified procedure) in
the prescribed intervals by a certified technician.
⚠Always turn off electricity prior to connecting the device or
removing any of its panels. Exercise maximal possible
care.
⚠The heat pump can be tilted during its transport and
installation to a maximum gradient of 45°!
⚠Never turn the heat pump on if it is not connected to a
heating circuit filled with water.
⚠The heat pump must never be turned on when its cover
is removed or its safety elements taken out of operation.
⚠Do not put your hands in the air suction and exhaust
openings. You could cut your hand on the evaporator or
get hurt by the ventilator! (for air/water)
⚠Arbitrary handling of the heating circuit connections, heat
pump and electric connections is dangerous and can
result in serious injuries.
⚠The pump can be serviced only by qualified service
workers.
⚠Do not change the device in any way and do not modify
its system.
⚠Do not use the device if it is mechanically damaged, falls
down or is damaged in any other way.
⚠Never cover the heat pump - its air intake and exhaust
have to stay free of obstacles.
⚠Do not install the heat pump at locations that could
become flooded.
⚠You should not install the heat pump near flammable
liquids and vapors.
⚠The pipes and compressor contain a cooling mixture
under a high pressure. That is why they should not be
exposed to high temperatures and rapture hazards, which
can lead to burns or suffocation.
⚠Water that is warmer than 52° C can cause serious burns
or even death from scalding.
⚠No signs, descriptions and warnings placed on the heat
pump must ever be removed or covered and they should
always remain visible. Replace the damaged ones by new
ones.
1.2. What has the heat pump been
design for?
Use the heat pump only for the purposes, for which it has been
produced by the manufacturer.!
It is absolutely necessary to comply with all technical and
operation conditions specified on the corresponding technical
sheets.
The above stated stipulations mean that the corresponding
project documentation has to be observed, including the use of
the prescribed devices!
Do not adopt any changes without consulting the project author.
Any technical changes on the device can be executed only after
obtaining a written consent from HOTJET CZ, s.r.o.
1.3. Legal regulations
A declaration on conformity has been issued for the heat pump.
The declaration includes the standards, with which it complies.
The heat pump has been designed for heating houses and
apartment buildings, hotels and other accommodation facilities,
offices, shops and similar work environments.
The heat pump can be operated by trained laymen, experienced
and knowledgeable persons. Children and persons with limited
physical, sensual and intellectual abilities or persons without the
necessary knowledge and experience should use the pump only
under the supervision of or in accordance with the instructions
issued by a responsible person.
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Children must never play with the heat pump in any way
whatsoever.
1.4.Economical operation conditions
The manner you use your heat pump has a significant impact on
your operation cost. Please pay attention to the following
information.
The heat pump is equipped with an intelligent regulator, correct
configuration of which forms an important condition of an
economical operation. The basis of an economical operation is
formed by operating your heating system at the so-called
equithermal temperature when the heating water temperature
changes based on the outside temperature. The higher the
outside temperature is, the lower the temperature of the heating
water. It is a wrong idea to operate the heat pump with a
constant output temperature of the heating water.
You should maintain as little difference between the source and
heating water temperatures as possible. Temperature increase
by 1°C increase the compressor consumption!
by approximately 2.5%.
The heating system should use as low of a temperature of the
heating water as possible. The heat source should have a
maximal possible temperature.
Operation of the heat pump with floor, wall and ceiling heating
systems or fan coils is more economical, since the operation!
temperature is 30-40 °C.
The heating factor is reduced by dirty heat source and heating
system exchangers since they increase the difference between
the temperatures.
2. Use of the heat pump
2.1.Usage area
The heat pump has been designed for heating water in existing
and new heating systems. Heated heating water can be used
not only for heating, but also for heating process water.
During the summer months, it can also be used for cooling.
The heat pump can be used for drying humid environments.
When using air-water heat pumps for melting, the temperature
of the heating water has to be at least 18 °C.
The first 2 heating seasons in new or renovated structures can
have of up to 50% higher heat consumption requirements, which
have to be covered by a bivalent source.
2.2. Operation principle
In order to work properly, the heat pump needs several main
components: compressor, evaporator, expansion valve,
condenser. There are many more components, however, the
heat pump will not work without the above mentioned ones.
The compressor, driven by electricity, compresses the coolant,
upon which the pressure and temperature increase. The heated
coolant passes through the condenser, where it passes its heat
to the heating water and condensates into a liquid. The liquid
enters the expansion valve where the temperature and pressure
rapidly drop. The coolant flows to the evaporator, where it
evaporates and cools down the heat source - air or water.
Subsequently, it enters the compressor and the cycle is
repeated.
Consumption during operation can be reduced by collecting heat
from a “cold environment” and “transforming” it to a higher
temperature. Energy collected in this manner is free. Operation
expenses are related to the consumption of the compressor and
other electric parts - regulation, circulation pumps, ventilator,
etc... The ratio between the collected and consumed electric
energy is variable. It is called the heating factor (COP) and its
value is, depending on the given conditions, within the following
range: 1.5-6.
During the heating mode, the energy is collected from the
outside environment and transferred to the heating water.
During the cooling mode, the system works in reverse, i.e. heat
is collected from the heating water and discharged to the outside
environment or recuperated and utilized at a location where
heating is required at the given moment.
The picture shows a simplified cooling circuit with a sample
temperature and pressure characteristics of the coolant, heat
source and heating site at various locations of the cooling circuit.
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3. Content of the delivery
•¥ Heat pump in a cardboard box
•¥ Assembly template
•¥ Accompanying documentation
•¥ Accessories pursuant to the given order
3.1. Heat pump
The heat pump is delivered fully filled with the coolant and oil. !
The heat pump block with its internal control box contains the
following main components.

Other components: bleeding and discharging valve,
The cooling circuit of the compact heat pump is hermetically
closed and includes the R410A fluoridated coolant, registered by
the Kyoto Protocol. The coolant GWP is: 2088. The coolant
does not contain Freon (CFC) and it is inflammable.
Coolant can be handled only by appropriately qualified persons
4. Control box with regulation
The control box with regulation is a covered, sheet metal box,
equipped with regulation for the heat pump and heating system
control. A particular diagram of a switchboard connection forms
a part of the delivered heat pump documentation.

5. Accessories
Součásti dodávky tepelného čerpadla může být následující
různé příslušenství:

6. Transport and storage
The heat pump is delivered in a cardboard box on a pallet.
Optional accessories can be delivered packed separately.
position
description
1
Radial ventilator
2
Evaporator
3
Expansion valve
4
Box with the control system
5
Electric cartridge with a pressure and
thermal fuse
6
Circulation pump with a 3-way valve
7
Panel condenser
8
Compressor (DC inverter or ON/OFF)
9
Four-way valve
10
Electronics of the frequency converter
11
Drawn air flange
12
Discharged air flange
13
pGD1 control panel
name
description
exterior equithermal regulation
sensor
Carel TH tune
spatial instrument
pCOWeb
Remote monitoring and control
Air-conditioning and ventilation
system building blocks
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6.1. Transport
Heat pumps are normally sent to their installation addresses
utilizing the services of hauling companies. All trucks that deliver
the heat pumps should be equipped with a hydraulic panel for
easy unloading and with a pallet cart for transporting the pump
along a given flat surface to, for example, a garage.
The cardboard box and the wooden pallet should be recycled or
returned to the manufacturer.
The heat pump should never be stored or installed on its side.
The maximal permitted tilting angle in any direction is 45°. It is
recommended to transport the pump in the upright position.
Not complying with these instructions can result in damages to
the heat pump.
When you receive your heat pump, unpack it, disassemble the
cover panels and make sure no damages have occurred during
the pump transport. Report any discovered damages to the
given hauling company and request their examination. Send a
copy of the report to HOTJET CZ, s. r. o.
Once you receive the pump at the given delivery address, use (if
possible) a pallet cart for transporting the heat pump to its final
location. "
6.2. Storage
⚠Warning: the defect responsibility period starts running 2
months after the pump is put in storage.
When the storage period is longer than 6 months, the cooling
circuit should be inspected prior to putting the pump into
operation by the manufacturer or authorized technician.
⚠If you disconnect the heat pump from the heating system or
electricity, it needs to be stored at temperatures#
that are higher than 0 °C in order to prevent freezing of residual
water in the hydraulic circuit of the heat pump.
7. Installation
7.1. Installation location
Air-water thermal pumps need to be installed inside of a building
- basement, garage, technical room, hallway or apartment.
The installation location has to have a temperature >0 °C year-
round.
It needs to be suspended on a vertical, dry wall where it cannot
be hit by splashing or dripping water.
Make sure the given building structure has a sufficient load
bearing capacity.
Do not install your thermal pump at locations with flammable
substances, pollution sources, dirt and fallen leaves.
Your thermal pump should be installed at a location with a
sufficient space and good ventilation.
You need to remember you will need extra space for connecting
the heating circuit and electric power supply.
7.2. Wall installation

660mm
910mm
5 x ∅9mm
1 2 3
4 5
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• ⚠When installing your heat pump on a wall, use the
supplied template#
and drill 5 holes.
•⚠The depth, bolts and wall plugs should be selected based
on the given wall type
•⚠First of all, prepare all holes and openings, including those
for the air vents, and install air bushings! You can thus prevent
dirt and waste from entering the air-ventilation system of the
heat pump.
•.

 "
•Fasten the upper suspension lath “A” using three bolts 1-3.
•Suspend heat pump “B” on he lath.


There are eyes 1 and 2 at its bottom part for possible anchoring
of your heat pump to the bottom holes in the wall. Anchoring is
MIN 600
MIN 900
660
910
5x
10
450
550
350
125
985
2070
370
650
1700
Vrtací šablona
Otvory vrtat vrtákem
350mm
MIN600
2400
1000
310
2070
Výfuk Sání
1
2
3
A
B
1 2
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•
5mm
1

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not necessary since the heat pump is sufficiently stable due to
its weight.
The heat pump has to be slightly slanted (about a 1% gradient)
with its bottom edge being slightly forward (approximately by 5
mm) in order to direct the condensate from the evaporator
towards the wall.
Make sure the wall is perpendicular and underlay the bottom
anchoring eyes with the necessary number of distance rubber
washers or other material.
7.3. Air intake and exhaust
The heat pump has been primarily designed for being used with
air, which is drawn from the outdoor environment, after which it
is exhausted out again.
The heat pump can be installed in enclosed areas without air
exchange only when appropriate calculations show that the
given space is sufficient with regard to the air volume,
temperature, etc. When the heat pump runs in the heating
mode, such areas will be cooled and dehumidified. In the
cooling mode, the space will be heated.
Installation of the internal unit in areas with a humidity greater
than 50% at temperatures around 20 °C can cause local
condensation at the outer side of the pump cover or in the air
vents due to excessive cooling. In this case, it can be suitable to
install additional external or internal cover insulation at the
condensation location.
It is not possible to ensure a 100% air tightness because of the
excess pressure in the air exhaust parts past the ventilator.
Waste air from buildings for raising livestock or sewerage
systems cannot be drawn into the evaporator since aggressive
vapors (such as ammonia) could damage it.
⚠When the pump is installed in areas with combustion
devices and the air is drawn from the given areas, an air intake
from the outside with a sufficient cross-section has to be
implemented. Some unavoidable leaks can exist at the air
suction locations. They can create dangerous negative
pressures! Consult such an implementation with a project
engineer.
7.4. Air vents
Special air vent hoses are installed for air conduction. They are
insulated in order to eliminate condensation of the air humidity
on its surface as much as possible.
When the installed air vents are made of solid materials (sheet
metal air vents), transfer of the vibrations into the given building
structure has to be eliminated by installing flexible collars (or
similar aids). Moreover, a sufficient thermal and vapor-resistant
insulation of the pipe surfaces has to be implemented.
For air intakes and exhausts, we deliver insulated air hoses with
an internal diameter of 250 mm, which have the same perimeter
as the oval necks for air intake and exhaust.
If other material is used, the given minimal cross-section in the
equivalent of circular pipes with a diameter of 0.25 m has to be
ensured, i.e. 0.049 m2.
Wall bushings can be of any shape, provided the #
minimal cross-section is observed. Rectangular bushings are
then used for adaptation to a circle or oval, to which the
standard connecting hose with a minimal diameter of 250 mm
can be connected.
The wall bushings have to be insulated, thus preventing freezing
of the wall and water condensation. We recommend to use at
least EPDM rubber with a thickness of 20 mm
7.5. Noise and vibrations
Do not install heat pumps on bedroom walls.
Connect the heat pump to the heating system using flexible
hoses or bellows.
The faster the compressor and ventilator rotations, the louder
the noise is.
Resonances can occur at some operation frequencies.
7.6. Load bearing capacity of the
structure
When installing your heat pump on higher floors (i.e. not on the
ground floor), addict or roof, verify that the given building
structure has a sufficient load bearing capacity.
Any installation on a wooden structure should be carefully
assessed#
since it could result in the transmission of vibrations
7.7.Condensate discharge
⚠In order to ensure a proper discharge of the condensate,
the heat pump has to be installed in the vertical position, with a
slightly slanted bottom edge from the wall, as it is described in
Chapter 7.1, Wall Installation. Not complying with these
conditions can lead to uncontrolled leaks of the condensate.
50 l of condensate (or even more) can be created on a daily
basis as a result of the pump operation. If discharge of the
condensate is not addressed, this condensate can cause the
building to become waterlogged.
The heat pump is manufactured with a heated waste basin for
catching the condensate from the evaporator.
The condensate flows through the hose in the bottom of the heat
pump. Extend the hose and connect it to the sewerage system.
The minimal slant of the hose horizontal line is 3%.
Use a hose with a greater diameter for the extension than the
one on the heat pump. Do not reduce the diameter of the output
condensate pipe!
The condensate hose inside of the heat pump is equipped with a
sink trap.
The greatest condensate quantity is discharged when the heat
pump is being melted. It can be up to 3 l of the condensate in
just 3 minutes. This volume has to be taken into consideration
when determining the capacity of additionally installed pumps for
discharging the condensate and catchment reservoirs.
If the condensate discharge passes through an exterior
environment or locations, temperature of which <0 °C, the
condensate discharge in these areas will have to be heated
using a heating cable.
name
description
1
Rectification rubber washers (included in
the delivery)
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⚠Warning: Condensation on the heat pump cover can occur
even at temperatures that are above freezing as a result of
cooling of the air that passes through the heat pump. This
condensate can uncontrollably drip under the heat pump.
7.8. Connection to a heating system

⚠Heat pump Hotjet MINI 5Wi is normally equipped with
internal circulation pump Grundfos UPM3 25-70 or another
circulation pump with similar parameters.
⚠Install a heating filter at the heat pump water inlet. Inspect
and clean it on a regular basis.
The heater connections are furnished with a 3/4” outer thread.
Implement the connections using hoses or bellows in order to
reduce vibration and noise transmission.
In order to ensure tightness of the connections, use flat sealing
and tighten the cap nut on the hose using the appropriate
wrench.
Prior to connecting the heat pump to the heating system, the
system should be flushed and any dirt, sealing residues, etc.
removed. Any dirt in the panel exchanger can cause defects.
Prior to starting the pump, the heating system has to be filled,
bled and pressure tested.
Moreover, you should also thoroughly insulate the pipe elbows
and valves. When cooling is used, the pipe insulation has to be
impervious to vapor.
For heating systems equipped with closable elements, such as
thermostatic heads, a minimal water flow through the heat pump
specified in the corresponding technical sheet has to be
ensured.
For systems with radiators, you need to dismount some of the
thermostatic heads.
The minimal circulation water volume in the heating system has
to be 15-20 l of water per 1 kW of the heat pump power output.
This rule does not apply to across-the-board systems, for which
the water volume can be lower.
A stable flow rate through the heat pump and compliance with
the minimal volume of the circulating water rule can be also
achieved by installing a compensatory reservoir, connected as a
torus.
Lower or no flow through the heat pump can lead to heat pump
operation malfunctions and, in extreme cases, to freezing of the
condenser and destruction of the heat pump
7.9. Safety valve
The safety valve shares the discharge lead with the condensate
waste on the bottom side of the heat pump. If the pressure in the
system is exceeded, water or steam can start leaking.
You must not handle the safety valve during operation.
The safety valve must not be used for draining the system. The
warranty does not apply to valves clogged with dirt from the
heating system.
Should the pressure in the heating system be repeatedly lost, it
could signal a defect of the safety valve.
7.10. Protection against freezing
When the heat pump is completely installed and connected to a
given power supply, the regulation system monitors the
temperature in the heat pump condensate and if it drops low, it
starts the circulation pump, thus allowing the water from the
heating system to heat the circuit to the heat pump.
Installation without service personnel present
This installation method applies to, for example, cottages and
cabins where one cannot detect electricity outages. For these
installations, we recommend to fill the entire system with an
antifreeze mixture (-10 °C).
8. Electric connection
⚠CONNECTING BLOCK. A CABLES CAN DIFFER BASED ON THEIR
DESIGN
1 2 3 4 5
6
position
description
1
Water output from the heat pump to the heating
system
2
Condensate discharge hose and safety valve
lead
3
Heating water output to the hot water heating
system
4
Output from the heating system and drawback
from the hot water heating system
5
Discharge valve
6
Bleeding valves of the panel exchanger and
electric cartridges
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⚠⚠The heat pump is connected based on the electric
diagram, which forms a part of the delivery from the
manufacturer.
⚠⚠Connection of the heat pump to any given building
distribution network is subject to approval by the given
electric energy supplier.
⚠⚠The necessary capacity of the main building circuit
breaker has to be assessed from the perspective of the
selected heat pump and other appliances (such as electric
bivalence).
⚠⚠All electric-installation works have to be conducted
pursuant to the valid standards and regulations.
⚠⚠These works can be conducted only by appropriately
trained workers - authorized persons with the necessary
qualification.
⚠⚠The manufacturer is not responsible for damages
caused by modifications of the heat pump electric
installation.
⚠The control switchboard of the heat pump is not furnished
with a main switch. It is expected that such a main switch
will form a part of the given secured power lead.
⚠In order to connect the heat pump to electricity, the
following elements have to be brought to the installation
location:
⚠Heat pump with the 3 kW bivalent source is connected
using a CYKY 5x2.5 cable and secured by a 16 A circuit
breaker
⚠The heat pump control by HDO signals is implemented
using the same cable that is used for powering it.
⚠The heating circuit control signals (signal from spatial
thermostats, temperature sensors, ...) are sent via a
SYKFY 2x2x0.5 cable or via another suitable equivalent.
⚠Signals for control members (circulation pumps, 3CV, ....)
are sent via a CYSY 3x1 cable or via another suitable
equivalent.
⚠
9. Disassembly of the heat pump
cover
Dismount bolts 1-4

Lift cover A in the direction of the arrows.
Dismount 3 bolts 1-3 on the left side of the cover and 3 bolts on
the right side of the cover.
Slide out panel “B” in the direction of the arrow.

10.Putting the heat pump into operation
•The heat pump can be out into operation by an authorized
technician only.
•In order to ensure long-term, safe and economical operation of
the heat pump, you have to observe the manufacturer’s
technical conditions and to install it in accordance with the
given project.
2
1
position
description
1
System connecting block
2
Bushing for the electric installation
1
2
3
4
A
1
2
3
B
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•The installation company that supplies the heat pump to the
customer is responsible for the installation and for
organizational and overall quality of the work
10.1. Preparation for putting into
operation
Prior to putting the heat pump into operation, you need to
execute and inspect the following steps:!
Installation and assembly of the heat pump have been
executed in accordance with the project and instructions
included in this documentation.
All prescribed heating system tests have been conducted. As
a minimum, they include flushing and pressure and distance
tests.
Prior to putting the device into operation, the heating system
has to be filled and bled. The heat pump filling and bleeding
procedure is described in the following chapter.
The quality of the heating water complies with the
specification of the given national standards (for example, for
the Czech Republic: ČSN%EN%07 74 01, Table 1).
All valves that could reduce the heating water flow rate in the
heating system have to be open.
The air suction and exhaust location has to be free.
Discharge of the condensate has to be ensured.
All weak-current and high-current cables, including MaR
cables, have to be connected.
A revision report for the electric connection of the heat pump
and its accessories has been prepared.
Configuration of the heat pump regulation has to be adjusted
based on the given heating system and in compliance with the
operation instructions.
10.2. Heating system filling procedure
When the heating system is being filled, the heat pump has to
be disconnected from electricity. Fill it slowly, thus allowing the
present air to escape through the corresponding bleeding
valves. The water quality has to comply with the given standard.
It has to be clear, colorless and without any ingredients and
suspended substances, oil and chemical additives. Should its
pH<7 or >9 and should its hardness >3.5mval/l (>1.75 mmol/l;
>9.8 °dH), adjust the water acidity and hardness by suitable
additives.
Filling procedure:
•Inspect and configure the pressure in the expansion container
in accordance with the prescribed static pressure in the
heating system. The expansion container does not form a part
of the heat pump delivery.
•Open the left bleeding valve on the bottom side of the heat
pump. The valve is manual. Close it as soon as water starts
flowing from it. If needed, you can also open the right valve.
•Open the heating system filling valve and monitor the
increasing pressure on the installed manometer. The target
pressure is between 1.0 and 1.5 bar.
•Bleed the heating system by starting the circulation pump. No
noise of the flowing air bubbles should be heard from the
heating system. Increase the system pressure as needed.
•Inspect all filters in the system after the filling procedure is
completed.
Manual startup of the internal circulation pump for bleeding
purposes. The circulation pump has to be set at its maximal
power output (see the circulation pump documentation):!
Menu: !
G. Service ↵F: Manual Mangement !
!
Row:
NO4 Primary pump: Manual operation of the circulation
pump: 1:MAN
0: AUT#
1: MAN#
#
After bleeding, return the parameter to the following value: 0:
AUT (!!!)
10.3. Putting the heat pump into
operation
⚠Warning: When the outdoor temperature is below 10 °C and
the heating water temperature drops below 19 °C, the Mini Air 5i
air-water heat pump can return errors when the pump is being
put into operation due to the low water temperature in the
heating circuit. In this case, you have to increase the water
temperature in the heating system using another heat source,
such as the built-in electric boiler.
11. Regular maintenance
Correct maintenance is very important for ensuring as
economical operation as possible and as long lifespan of the
heat pump as possible. The following points should be used as
a general guideline. Particular maintenance requirements should
be always consulted with the given installation company.
Do not place any objects on the upper cover of the device.
The evaporator should be cleaned at least twice a year and
anytime it is visible dirty. Dirty evaporator reduces the operation
efficiency. Outer surfaces of the heat pump can be washed with
a sponge and warm soapy water. Do not use bleaches,
abrasives or solvents that could damage the device surfaces.
The cleaning agents should not contain acids, sodium or
chlorides. Make sure water does not come into contact with the
electric parts.
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When the temperature is below freezing, regularly inspect your
exterior unit, making sure there is not too much of rime or ice
under the pump. Snowing and heavy winds can clog the
evaporator inlets. Ice and snow have to be removed.
Filters:
The heat pump heating circuit is equipped with filters that can
become clogged. Inspect their cleanliness at least twice a year.
Close the closest valves in front and beyond the filter, remove
the sieve and clean it. Once you reinstall the filters, bleed the
heating system and add water to the heating system.
⚠Warning:
The Mini Air 5Ai heat pump includes a ventilator that can start
running anytime when the heat pump is under power. #
Turn it off, disconnected it from electricity and wait until the
ventilator stops prior to conducting maintenance on the
evaporator part of the heat pump and around the ventilator.
Draining the pump when it is shut down:
Should the heat pump be out of operation for a longer period of
time or should it be disconnected from the power, drain the
water from it. You will thus prevent freezing problems that you
could experience when the power is off.
To drain the heating system, use the valve designated for this
purpose. In order to completely drain the heat pump after it has
been disconnected from power, use the discharge valve on the
bottom side (no. 5).
⚠Warning: Water drained from the heat pump can be hot,
which could represent a burning hazard.
⚠Warning:
If the heat pump does not start and does not heat, consult the
situation with your installation company.
The heat pump cover should be removed only by qualified
workers.
11.1. Inspection prior to the heating
season
A competent service technician should conduct the following
inspection steps:
Inspection of the electric installation:
Inspect the condition of the electric installation connections prior
to the heating season.
Heating system:
The functionality of the heating system has to be inspected prior
to the heating season.
12.Defects and how to locate them
⚠Warning
Any work on the heat pump can be conducted only by
authorized and qualified service technicians.
¥The Mini Air 5i heat pump is a high-quality product that
has been designed exclusively for a service-free operation.
¥ Should a malfunction occur, it is displayed on the heat
pump display or on the remote access website.
¥ Some operation stops and subsequent error
messages are related to reaching the limits of the compressor’s
operation containment. Their occurrence can be change by
appropriate regulation adjustments.
¥ When the service key is displayed, it does not signal a
defect. It is displayed for informative purposes only and it has no
impact on the heat pump operation.
¥ Most defects are related to insufficient heating water
flow caused by the closed circuit, air in the system or
dysfunction of the circulation pump.
¥ A list of the error messages, including their most
common causes, is included in the corresponding chapter of the
regulation manual.
¥ If you are not able to correct a defect yourself, contact
a service technician.
13.Disassembly and liquidation
Liquidation of the device should be entrusted to a professional
cooling company or to the manufacturer. The product includes
certain media (coolant, oil), which have to be liquidated in the
prescribed manner.
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Close all incoming valves and disconnect them from power prior
to disassembling the heat pump.
14.Circulation pump parameters
Grundfos UPM3 25-70 HYBRID circulation pump is integrated in
the heat pump. This circulation pump is not controlled and it is
set at the MAX capacity, thus allowing for conducting bleeding of
the system.
A different operation mode can be set for the pump standard
operation based on the given circulation pump documentation .
15.Parameters of the 3-way valve
A three-way Honeywell valve for switching the hot water heating
is integrated to the heat pump. Its drive has been designed for
230 V and Kvs = 7.7.

Request the corresponding documentation from the valve
manufacturer for more information

16.Built-in electric boiler
An electric boiler with an automatic startup mechanism forms a
built-in part of the heat pump. It is used as a backup source and
power output addition#
in cases when the heat pump is not able to supply a sufficient
volume of heat on its own.
The electric boiler is started if a given required temperature is
not achieved within the specified time.
Model
Grundfos UPM3 25-70 Hybrid
Power supply
1-230V, 50/60Hz
Energy class
A
Maximal power input
52 W
Maximal displacement
7 m
Minimal input pressure
0.5 bar at 95 °C
Range of the liquid
temperatures
+2 °C to 110 °C
Complies with ecodesign
2015
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17.Hydraulic integration
Basic diagram of the heat pump connection to a direct heating circuit. Controlling spatial temperature using a spatial#
thermostat ON/OFF.
Diagram with a compensatory reservoir
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TČ
sánívýfuk
odvod
kondenzátu
a odpad
z pojišťovacího
ventilu
Zásobník ohřevu TV
Topnýokruh
B3
Termostat
(ID9)
TČ
sánívýfuk
odvod
kondenzátu
a odpad
z pojišťovacího
ventilu
Zásobník ohřevu TV
Topnýokruh
B3
Termostat
(ID9)
NO9

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18.Warranty, Post Warranty Terms and Conditions and Liability for Defect
• HOTJET CZ s.r.o. (hereinafter only "HOTJET"), shall be liable for the delivery performance in the quantity,
quality and design according to the purchase contract..
• HOTJET shall be liable for defects demonstrated within the warranty period, which is 24 months for the final
consumer - non-entrepreneur, unless agreed upon otherwise. The warranty period for entrepreneurs is 12
months, unless agreed upon otherwise in writing. Existence of the warranty period for HOTJET products is
subject to fulfillment of the terms and conditions set out in this Warranty Certificate.
• The warranty covers defects in material, function and/or workmanship. The warranty is not applicable to defects
caused by incorrect project, incorrect installation, handling, wiring or incorrect operation, improper electrical
fuses and installation, failure to comply with the specified voltage, unprofessional or inadequate interference
and manipulation, modification or dismantling (in case of subsequent installation the preservation of rights
resulting from the warranty is a subject to completion of all protocols relating to the assembly), misuse, natural
disasters, Force Majeure, violent damage and maintenance neglect. The warranty shall expire also should an
unauthorized person interfere into the product. Normal wear and tear of operating fillings is not covered by the
warranty. Operating fillings are not covered by the warranty. The warranty covers only the Goods supplied by
HOTJET. Responsibility for the product selection and use rests entirely with the buyer. The product must be
used in the manner and for the purpose for which it is intended. The installing company provides the warranty
adequate to the warranty period provided for the delivered equipment. If specific warranty conditions are
applicable to certain types of products and services, these shall be specified in the warranty certificate
accompanying the product, whereat the scope and terms of warranty provided to individual product groups may
vary.
• The warranty period commences as of the so-called authorized commissioning of the heat pump. The
authorized commissioning means the process of control activities and the heat pump starting by an authorized
technician certified by HOTJET, however not later than upon expiry of two months from the date of the goods
take over by the buyer. The buyer means HOTJET’s direct business partner to whom the relevant goods are
sold as to the first in the order. The delivery date and the person, to whom the goods were delivered, are always
written and confirmed in the warranty certificate. The period, during which the buyer cannot use the goods due
to a warranty defect, shall not be included into the warranty period.
• The buyer is entitled and obliged to claim visible defects, quantity and completeness of the goods within 3 days
from the goods take over. Any later claims of this nature will be disregarded. Should a defect appear during the
warranty period, the buyer shall inform HOTJET in writing or by e-mail on the defect occurrence, it shall
describe the defect and indicate how its manifested, furthermore, the buyer shall indicate the manufacturing
number, and send the relevant warranty certificate containing the date of sale, invoice number and place of
installation. The parties have agreed that by the aforementioned claim submission it shall be deemed that the
buyer requires a free of charge removal of the defect – by delivery of the material. Based on the defect
description, consultations and possible technical inspections of the equipment, HOTJET shall decide on the
manner of the claim solution or the claim process commencement. HOTJET has the right to require other
documents, e.g. photographs of the installation place, equipment to which the complaint relates, respectively,
from the buyer.
• In case of a justified claim process according to this warranty certificate, HOTJET shall provide the buyer with
repair materials for putting the product into operable condition. The costs associated with repairs shall not be
paid by HOTJET. Parts and materials to which the claim relates shall be send by the buyer to the HOTJET’s
address without any delay.
• If HOTJET, based on an expert’s opinion on the parts received from the buyer in the claim process, determines
that the claim is unjustified, the buyer shall be obliged to pay to HOTJET all costs associated with the claim
process, as well as the handling fee in the amount EUR 150.
• The warranty under this warranty certificate and the HOTJET’s General Terms and Conditions of Contract, is
provided only outside the territories of the Czech Republic and Slovakia. The warranty for other countries of the
world community shall also be applicable to these goods, i.e. to warranty repairs, in case of which the goods
shall be shipped to the HOTJET’s registered office at the buyer's expense and shipped to the buyer after
repairing also at the buyer’s expense.
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19.EC declaration of conformity to the heat pump
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