nilan Compact P2 User manual

INSTALLATION INSTRUCTIONS
Compact P2 / Compact P2 Polar - AIR9
Gateway
CTS602 HMI BY NILAN
Version 1.00 - 01.09.2022
M24 Compact P2 AIR9 GB

2
Table of contents
General information
Important information .........................................................................................................................................................................4
Safety ............................................................................................................................................................................................................4
Power supply .........................................................................................................................................................................................4
Heat pump domestic hot water ..........................................................................................................................................................4
Heat pump for central heating ...........................................................................................................................................................4
Starting the external unit ....................................................................................................................................................................5
Water quality requirements ......................................................................................................................................................................5
Requirements to quality of water ......................................................................................................................................................5
Introduction ..................................................................................................................................................................................................5
Documentation ......................................................................................................................................................................................5
Unit type ........................................................................................................................................................................................................6
Product description ..............................................................................................................................................................................6
Unit - the indoor unit ............................................................................................................................................................................7
Unit - the outdoor unit ..........................................................................................................................................................................8
Temperature sensor overview ...........................................................................................................................................................9
Dimensional drawing ......................................................................................................................................................................... 10
Piping diagram .................................................................................................................................................................................... 11
Accessories ................................................................................................................................................................................................ 12
Electrical pre-heating element for frost protection of the unit ................................................................................................ 12
CO2 sensor .......................................................................................................................................................................................... 12
Expansion PCB .................................................................................................................................................................................... 12
EM-box ................................................................................................................................................................................................. 12
DTBU damper ..................................................................................................................................................................................... 12
Extension cable HMI control panel .................................................................................................................................................. 13
Cover plate HMI user panel .............................................................................................................................................................. 13
Safety group ....................................................................................................................................................................................... 13
Safety group with scalding protection ........................................................................................................................................... 13
Flexible sound damper ...................................................................................................................................................................... 13
Pollen filter .......................................................................................................................................................................................... 14
Trolley .................................................................................................................................................................................................. 14
SHW hot water tank ........................................................................................................................................................................... 14
Set-up
Mounting .................................................................................................................................................................................................... 15
Transport into the building .............................................................................................................................................................. 15
Positioning the unit ............................................................................................................................................................................ 15
Mounting outdoor unit ............................................................................................................................................................................. 16
Transport into the building outdoor unit ....................................................................................................................................... 16
Sound data AIR9 ................................................................................................................................................................................. 16
Positioning an outdoor unit .............................................................................................................................................................. 17
Fixing an outdoor unit to its supporting surface .......................................................................................................................... 17
Foundation .......................................................................................................................................................................................... 18
Condensate drain ............................................................................................................................................................................... 18
Detaching the front doors from the AIR outdoor unit ................................................................................................................. 19
Electrical installation
Safety ................................................................................................................................................................................................... 20
Connections overview ...................................................................................................................................................................... 20
Electrical connection unit ........................................................................................................................................................................ 21
Power supply ...................................................................................................................................................................................... 21
Compact P2 AIR .................................................................................................................................................................................. 21
Change from 400V to 230V ............................................................................................................................................................. 22
Circulation pump ................................................................................................................................................................................ 23
Connecting a gateway ............................................................................................................................................................................. 23
Connecting to the internet ............................................................................................................................................................... 23
Location on the unit ........................................................................................................................................................................... 23
HMI Control panel ..................................................................................................................................................................................... 24
Moving the control panel .................................................................................................................................................................. 24
Wall bracket ........................................................................................................................................................................................ 24
Electrical connection accessories .......................................................................................................................................................... 25
SHW hot water tank ........................................................................................................................................................................... 25
User selection 1 .................................................................................................................................................................................. 25
Smart Grid ........................................................................................................................................................................................... 26
External electrical pre-heating element ........................................................................................................................................ 27
Mounting an expansion PCB on the CTS602 circuit board ......................................................................................................... 28
User selection 2 .................................................................................................................................................................................. 30
EM-box (damper option) ................................................................................................................................................................... 30
DTBU (damper option) ....................................................................................................................................................................... 31

3
Fire thermostat / external fire automation system ....................................................................................................................31
Joint alarm ............................................................................................................................................................................................32
External heat supply ..........................................................................................................................................................................32
External underfloor heating control ...............................................................................................................................................33
Active cooling function ......................................................................................................................................................................33
Plumbing installation
Condensate drain ......................................................................................................................................................................................34
Important information .......................................................................................................................................................................34
Hot water tank ...........................................................................................................................................................................................35
Connection overview .........................................................................................................................................................................35
Connection ...........................................................................................................................................................................................35
Requirements to quality of water ...................................................................................................................................................36
Hot water circulation .........................................................................................................................................................................36
Supplementary coil ............................................................................................................................................................................36
Softened water ...................................................................................................................................................................................36
Central heating ..........................................................................................................................................................................................37
Water connection overview, indoor unit ........................................................................................................................................37
Connections overview outdoor unit ................................................................................................................................................38
Mounting hoses to the outdoor unit ................................................................................................................................................39
Insulation of hoses from the outdoor unit .....................................................................................................................................40
Check list for the central heating system prior to start-up ........................................................................................................40
Plumbing connections accessories ........................................................................................................................................................41
Safety group ........................................................................................................................................................................................41
Safety group with anti-scald protection ........................................................................................................................................41
Hot water tank ....................................................................................................................................................................................42
Connecting to SHW hot water ..........................................................................................................................................................43
Connection to supplementary coil in SHW hot water tank .........................................................................................................44
Connecting to DHW hot water ..........................................................................................................................................................44
Ventilation installation
Duct system ...............................................................................................................................................................................................45
Legislation ............................................................................................................................................................................................45
Ducts .....................................................................................................................................................................................................45
Ventilation unit ...................................................................................................................................................................................45
Extract air ............................................................................................................................................................................................46
Supply air .............................................................................................................................................................................................46
Roof terminals .....................................................................................................................................................................................46
Installation example ...........................................................................................................................................................................46
Balancing ....................................................................................................................................................................................................47
Important information .......................................................................................................................................................................47
Start-up
Central heating ..........................................................................................................................................................................................48
Filling with water .................................................................................................................................................................................48
Topping up water ................................................................................................................................................................................48
Check the particle filter .....................................................................................................................................................................48
Troubleshooting
Emergency mode .......................................................................................................................................................................................49
Emergency mode domestic hot water ............................................................................................................................................49
Emergency mode central heating ...................................................................................................................................................50
Domestic hot water ..................................................................................................................................................................................51
Errors and solutions domestic hot water .......................................................................................................................................51
Central heating ..........................................................................................................................................................................................52
Problems and solutions central heating .........................................................................................................................................52

4
General information
Important information
Safety
Power supply
Heat pump domestic hot water
The heat pump must undergo suitable service inspections under applicable legislation and regulations to keep it in good condition and
in compliance with safety and environmental requirements.
Responsibility for maintenance of the heat pump rests with the owner/user.
Heat pump for central heating
The heat pump must undergo suitable service inspections under applicable legislation and regulations to keep it in good condition and
in compliance with safety and environmental requirements.
Responsibility for maintenance of the heat pump rests with the owner/user.
WARNING
Do not turn on the power supply for the unit until there is water in the hot water tank and the outdoor unit has been con-
nected up to the unit.
If, during the construction phase, you want to have access to ventilation and domestic hot water, but you do not want to
connect up the outdoor unit, you must uninstall the circulation pump between the indoor and the outdoor units.
CAUTION
Always disconnect the power supply to the unit if an error occurs that cannot be rectified via the control panel.
CAUTION
If an error occurs on electrically conductive parts of the unit, alway contact an authorised electrician to rectify the error.
CAUTION
Always disconnect the power to supply to the unit before opening the unit doors, for instance for installation, inspection,
cleaning and filter change.
CAUTION
Avoid direct contact with the heating system pipes in the heat pump as they can get very hot.
CAUTION
To protect the heat pump against damage, it is equipped with electronic temperature monitoring.
CAUTION
To secure the heat pump against damages, it is fitted with the following safety equipment:
• Expansion systems for central heating and buffertank
• Safety valve for central heating and buffertank
• Low and high pressure switch for compressor

5
Starting the external unit
The AIR outdoor unit is equipped with a compressor heating element, which heats up the compressor prior to starting and in case of
low outdoor temperatures. This facilitates start-up and extends the compressor’s service life.
Water quality requirements
Requirements to quality of water
The hot water tank in the Nilan units is made of steel, which has been given a double enamelling, to ensure an extra long service life. In
addition, the tank is equipped with a sacrificial anode as extra protection. It is important that the sacrificial anode is replaced regularly.
Most units are equipped with an electronic monitoring sacrificial anode, which gives an alarm on the user panel when it is time to re-
place it.
In order for the sacrificial anode to function and protect the tank, it is required that the water quality complies with the following:
• Electrical conductivity (EC): Between 30 mS/m and 150 mS/m (millisiemens pr. m) @ 25 °C
• Chloride must be below 250 mg/L @ 65 °C
If the above criteria are not met, the sacrificial anode will not work as intended, after which the tank will be corroded.
Introduction
Documentation
The following documents will be supplied with the unit:
• Installation instructions
• Software instructions
• User Manual
• Wiring diagram
The instructions can be downloaded from www.nilan.dk.
If you have questions regarding installation and operation of the unit after having read the instructions, please contact your nearest
Nilan dealer. A list of Nilan dealers is available on www.nilan.dk.
From factory, the unit has been tested and is ready for operation.
CAUTION
The compressor heating element must be left on for a minimum of 3 hours before starting the compressor for the first
time.
ATTENTION
The unit must be started up immediately after installation and connection to the duct system.
When the ventilation unit is not in operation, humidity from the rooms will enter the duct system and create condensate
water that can run out of the valves and cause damage to floors and furniture. Condensation may also form in the ven-
tilation unit, which can damage its electronics and fans.

6
Unit type
Product description
Compact P2 AIR is a ventilation unit with heat recovery, that has a built-in heat pump, which is used for the production of domestic hot
water, and which is also able to heat and cool the home by central heating via an air/water heat pump.
Compact P2 is designed for air flows of up to 425 m3/h at 75 Pa external counter-pressure
The unit is primarily used in residential construction such as single-family houses and apartments. It ventilates the home by drawing
out the moist and bad air via valves in e.g. bathrooms, toilet, kitchen and utility room, and introduces fresh outdoor air in via valves in
living rooms such as. living room, bedrooms and family room.
The cold outdoor air is heated via the high-efficiency counterflow heat exchanger by the hot exhaust air. The heat loss that occurs via
heat recovery, the built-in heat pump use to produce domestic hot water. All the energy in the exhaust air is utilized, and you have not
really seen any heat loss that you experience with an ordinary ventilation unit. In case of high hot water consumption, there is a 1.5 kW
electric supplement heater in the hot water tank, which can also be used to heat the water.
In the winter, the built-in heat pump can heat the supply air up to 34 ° C, and thus contribute to heating the home. When the supply air
is heated, at the same time a little heat is deposited in the hot water tank and ensures a constant high hot water temperature.
The heat pump has a reversible cooling circuit, which means that the cooling circuit can be turned and it can cool the supply air in the
summer. Compact P2 can cool the supply air by up to 10 ° C in relation to the outdoor air. Due to the low air exchange, usually 1/2 time
per hour, it will not act as an air conditioning system. However, when cooling, moisture in the supply air is removed, which results in a
lower humidity in the home. The lower humidity means that it is easier to withstand a slightly higher temperature, which therefore pro-
vides good comfort in the home.
When Compact P2 cools the supply air, the energy is deposited in the hot water tank, and it can thus be said that “free” domestic hot
water is produced during those periods.
The energy-efficient and low-noise AIR air/water heat pump heats the home via floor heating or low-temperature radiators. It re-
trieves the energy from outside air and functions at temperatures as low as -22 ºC. The heat pump has an electrical power supply to
help it to function during very cold periods. AIR can cool the home in the summer with passive cooling, either through the underfloor
heating system or fan coils.
The AIR air/water heat pump can also be used to help produce hot water for domestic use, either by pre-heating the water in a buffer
tank, or directly in a Compact P2 hot water tank, if bought with a solar coil.

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Unit - the indoor unit
Compact P2:
1. Duct connections
2. Filter replacement door
3. Control panel (HMI touch panel)
4. Extract air filter
5. Outdoor air filter (if purchased as an accessory, a pollen fil-
ter should be fitted here)
6. Counterflow heat exchanger
7. Heat pump
8. Automation CTS602
9. Fans
10. Pre-heating element for frost protection (Polar version only)
11. 100% bypass damper
12. Electrical connections accessories
13. Gateway for App option
14. 180 litres hot water tank (DHW)
15. 1.5 kW immersion heater (with overheat protection)
16. Electronically monitored sacrificial anode
17. Supplementary coil (SOL version only)
18. Plumbing connections
19. Electrical connections panel
20. Emergency mode (DHW)
21. Condensate drain with water trap
AIR:
22. Safety valve and manometer for the central heating circuit
23. Buffer tank 50 litres
24. Filling tap and particle filter for the central heating circuit
25. Integrated circulation pump for circulation with the outdoor
unit
26. Supplemental electric heating for central heating 2x3kW
27. Expansion vessel for central heating circuit 8 litres

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Unit - the outdoor unit
Front: Closed and open
Rear side: Closed and open
AIR outdoor unit:
1. Fan
2. Evaporator
3. Heat pump
4. Condensate drain with integral heating cable
5. Connections to/from the indoor unit (liquid)
6. Electrical connection cable for AIR heat pump outdoor unit (screw ter-
minal)
7. Communication cable with connector for connection to the indoor unit
(RJ45)
Side: Open
ATTENTION
The illustrations above show an example of an AIR outdoor unit. Different versions of the outdoor unit are available.

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Temperature sensor overview
Temperature sensor in the AIR outdoor unit
T16: Before the condenser (to outdoor unit)
T17: After the condenser (from outdoor
unit)
T20: Outdoor temperature
T23: Evaporator temperature
T35: Pressure pipe temperature
Temperature sensor in the AIR indoor unit
T18: Buffer tank (supply flow)
Temperature sensor in Compact P2
T1: Outdoor air
T2: Supply air
T4: Extract air after the exchanger
T5: Condenser
T6: Evaporator
T10: Extract air
Temperature sensor in the hot water tank
T11: Top of the tank
T12: Bottom of the tank
Temperature sensor outside the unit
T7: Supply air after the after-heating
element (accessory)
T8: Outdoor air before pre-heating el-
ement (accessory)
T9: On the after-heating element (ac-
cessory)

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Dimensional drawing
Indoor unit:
Outdoor unit AIR9:
Connections:
1. Outdoor air
2. Supply air
3. Extract air
4. Discharge air
Weight indoor unit: 268 kg
Weight AIR9 outdoor unit: 155 kg
All measurements are indicated in mm.
Seen from below The bottom seen from above
13
24
204
900
Ø160
204
900
187
610
2153
109
108 108

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Piping diagram
* Everything within the red box is Nilan delivery.
18. Connection 1"
19. Flexible hose 1"
20. Shut-off valve
21. P1 circulation pump 130 mm
23. Supplemental electric heating 2 x 3 kW
24. Temperature sensor T18 buffer tank (flow)
25. Flexible hose 10 mm
26. Automatic air vent valve 3/8"
27. Expansion vessel 8 litre
28. Manometer
29. Safety valve 2.5 bar
30. Shut-off valve with particle filter
31. P2 circulation pump
33. Check valve 3/4"
37. Filling tap 1/2"
50. Temperature sensor T23 evaporator element
51. Temperature sensor T20 outdoor temperature
52. Temperature sensor T17 after condenser
53. Temperature sensor T16 before condenser
TT
PI
TT
TT
TT
TT
TC
P2
P1
50
51
52
53
19
19
18
18
20 20
20 2021
37
24 26
25
28 29
30
31
33
27
23
AIR outdoor unit
supply flow
return flow
1" supply flow
1" return flow
Buffer
tank
AIR indoor unit

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Accessories
Electrical pre-heating element for frost protection of the unit
CO2 sensor
Expansion PCB
EM-box
DTBU damper
If your ventilation unit is not a Polar version with an integral pre-heating element, we recommend that you
purchase an external pre-heating element as frost protection of the ventilation unit.
During prolonged periods of frost, the high efficiency counterflow heat exchanger will ice up. To prevent ice
formation, we recommend that you install an electrical pre-heating element.
The pre-heating element consumes limited energy and it ensures efficient heat recovery without periods of
defrosting the counterflow heat exchanger. You thereby achieve an overall reduction in energy consump-
tion.
If you want to adjust the fan speed level in accordance with the level of use of the dwelling/building (amount
of people), you can retrofit a CO2 sensor. Nilan’s CO2 sensors calibrate automatically.
On the control panel, you select the CO2 level you want. If this level is exceeded, ventilation will automatically
increase.
An expansion PCB extends the functions in the control system so you can control various accessories.
Under “Electrical connection accessories” you will be able to see which accessories require an expansion PCB.
If you want to run the cooker hood via the ventilation unit, in some cases there may be insufficient air for
cooker hood extraction.
If you install an EM-box, you can regulate the extracted air when the cooker hood is in operation, so that less
air is drawn from, for instance, the bathroom and the utility room. This will allow enough air for the cooker
hood to extract sufficiently.
The EM-box is fitted with a metal filter that cleans the air in the cooker hood of grease particles efficiently. It
thereby protects the ventilation unit.
If there is insufficient space for mounting an EM-box in the installation, you can achieve the same effect by
controlling the extract air with a DTBU damper.
You then have to adjust the duct system yourself with a connection to the cooker hood.

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Extension cable HMI control panel
Cover plate HMI user panel
Safety group
Safety group with scalding protection
Flexible sound damper
The control panel for the ventilation unit is connected up with a short wire so it can be installed close to the
unit.
If you place the unit so the control panel is out of sight, for instance in a cupboard or in the loft, you can order
a 15 m extension cable with plug. This allows you to place the control panel where it is visible to the user.
It is important that the control panel is visible so the user can see alarms when, for example, filters need
replacing.
It is possible to move the HMI control panel away from the unit and place it in a more visible place.
A cover plate can be ordered to cover the hole where the control panel was located.
By law, a safety group must be fitted for the cold water connection to the hot water tank.
Nilan offers a safety valve in brass with the following functions:
• Safety valve
• Check valve
• Stop valve
• Drain tab
The control has a software scald protection that ensures that the water in the hot water tank does not gets
too hot.
If you have a large cooling and / or heating need, it may be necessary to deactivate the software scald pro-
tection. The water in the hot water tank can be up to 90 ° C, which is why you need to install a safety group
with scald protection.
If a solar panel is used to heat the domestic hot water via the supplementary coil in the hot water tank, a safe-
ty group with scald protection must be fitted.
To make it esay to service the unit in the future, we recommend that you fit a flexible connection between
the unit and the duct system.
Nilan flexible sound damper absorbs sounds effectively from both the duct system and from roof stacks.

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Pollen filter
Trolley
SHW hot water tank
The ventilation unit comes, as standard, with a plate filter to protect the unit.
If the dwelling is used by anybody with, for instance, pollen allergies, you may benefit from purchasing a pol-
len filter. This should be placed in the outdoor air intake, which will reduce the pollen count in the dwelling.
A Nilan trolley makes it easy to transport the heavy units into the home, without having to carry out heavy
lifting yourself with the risk of injury.
A set consists of two lifting carts that are fastened on each side of the unit while it is standing on the pallet.
Using the two handles, lift the unit off the pallet and drive it to where it is to be used.
The SHW tank is a Nilan-produced 250 liter hot water tank with built-in solar coil and heat pump supplemental
coil that can be connected to all Compact P solutions.
The SHW tank is prepared for mounting a temperature sensor for external solar heat control. The supple-
mental spiral is intended for solar heating systems with solar collectors of approx. 4 m2.
The steel container is with double enamelling to guarantee a perfect water quality. It comes with a 1.5kW in-
sert heating element as well as an electrically monitored magnesium sacrificial anode, both of which are con-
trolled by the CTS automatics.
The solution is ideal for families with a large consumption of hot water.

15
Set-up
Mounting
Transport into the building
The ventilation unit is delivered fully assembled and wrapped on a pallet.
You can lift the unit from the pallet and transport it into the building by using a Nilan lifting dolly. You thereby avoid heavy lifting.
Positioning the unit
Set up the unit so it is level on a firm surface free of vibrations. You need to have easy access to the unit for servicing and filter replace-
ment.
The unit is delivered from the factory fitted with 4 lifting straps, one in each corner.
This gives you the option of lifting the unit inside using a crane, which can be a considerable advan-
tage, if the ground is not suitable for a lifting dolly.
When lifting the unit using the attached straps, these must be at an angle of 45° from vertical.
ATTENTION
When positioning the unit, you should take into account future services and maintenance. We therefore recommend a
minimum of 60 cm of free space in front of the unit.
ATTENTION
The unit must be level to ensure proper drainage from the condensate tray.
ATTENTION
If flashings are fitted above the unit, these must be easily removable.
Near the bottom on the sides and at the back of the unit, the metal
has been punched out so you do not have to cut any holes yourself.
If you detach the metal angle from the base frame at the rear side of
the unit, you will be able to push the unit closer to the wall and
thereby hide connections for water.

16
Mounting outdoor unit
Transport into the building outdoor unit
The AIR outdoor unit is delivered wrapped in foil and fixed on a transport pallet with strapping bands.
If the surface is suitable, we recommend that you use a lifting dolly to move the unit.
Sound data AIR9
The sound propagation from the AIR outdoor unit depends on the location of the unit in relation to the building, as well as its supporting
surface and its surroundings.
Sound power LWA dB(A) 7/6 ºC - 30/35 ºC = 46 db(A) in accordance with EN14511, EN12102 and EN3743/1
Sound pressure LpA dB(A) calculated in accordance with EN13487:2003:
ATTENTION
If you use a crane to lift in AIR, please be aware that the weight is not evenly distributed at the front and at the back.
ATTENTION
The outdoor unit must not be lifted by the doors, which is why these should be removed during transport.
Q = 2 (freestanding) Q = 4 (up against a wall) Q = 8 (in a corner)
Distance in metres 1 2 6 10 21
Location factor 2 38 32 22 18 12
Location factor 4 41 35 26 21 15
Location factor 8 44 38 28 24 18

17
Positioning an outdoor unit
An outdoor unit must always be positioned on a firm, horizontal and vibration free surface. Consider securing it to a fixed base. You
should also take into account the prevailing wind direction during the cold months when heating is required, as the performance of the
heat pump will be reduced if the outdoor unit is exposed to strong winds.
Fixing an outdoor unit to its supporting surface
If you place the outdoor unit in a windy location, e.g. on a roof, you will need to fix it to the supporting surface by using the 6 pre-drilled
holes at the bottom.
If required, you can consider putting up a windbreak. How-
ever, clearance requirements must be met.
Shown below are the horizontal minimum distances to build-
ing parts and sim. that are required for the heat pump to per-
form properly.
If you want to position AIR up against the building, it is impor-
tant that you take into account potential noise from the out-
door unit so it does not become a cause of irritation indoors.
Position AIR so air is supplied from the dwelling. The air gains
added energy from solar heating of the building walls during
the day and from general heat loss from the building. This can
then improve the efficiency of the heat pump.
AIR outdoor unit seen from below: AIR outdoor base plate:
ATTENTION
The illustrations above show an example of an AIR outdoor unit. The outdoor unit is available in different versions. See
the dimensional drawing for details.
Compressor unit
Pre-drilled holes

18
Foundation
The illustrations above show an example of an AIR outdoor unit.
Condensate drain
During operation, condensate water will form in the evaporator of the outdoor unit. It must be able to drain away safely. A 700 mm
hose has been fitted to the condensate tray of the evaporator. You run this to a drain.
The condensate drain must be protected against frost although the 1.5 m heating cable Ø25/4 mm, included, also helps keep the con-
densate drain frost free. The heating cable starts heating at an outdoor temperature < 2 ºC.
ATTENTION
AIR should be placed on a stable surface or a poured foundation.
ATTENTION
The condensate water must be able to drain safely so it does not cause damage to the building.
ATTENTION
The condensate drainage system from the outdoor unit must be dimensioned so that it can drain up to 6 litres/hour.
If the condensate water drains into gravel, you must ensure
that the drainage system reaches the frost-free subsoil.
If the outdoor unit is placed close to the building, the conden-
sate water can simply drain into one of the downpipes. Remem-
ber to install a water trap.
The condensate water can also be led directly to a surface
water drainage system.
150 mm150 mm
Fascine
Pipe for electrical connection
min. 50mm
Drain for condensate water
Foundation
Adjustable
legs

19
Detaching the front doors from the AIR outdoor unit
If you need to access the mechanics, electronics or the plumbing connections in the AIR outdoor unit, you can detach the upper and
lower metal plates at the front.
WARNING
Always disconnect the power supply to the unit before opening the doors to carry out e.g. installation, inspection, clean-
ing or maintenance.
1. The AIR outdoor unit has an upper front plate with slats,
and a lower front plate with a smooth surface.
2. The two front plates have been mounted using keyhole
mounting brackets.
3. Detach the upper front plate by lifting it upwards and off
the screws.
4. Next, tilt the plate away from the outdoor unit and detach
it completely.
5. Detach the lower front plate in the same way by first lift-
ing the cover plate and then tilting it outwards.
6. The AIR outdoor unit is now open, and you can access the
mechanics, the electronics and the plumbing connections.
ATTENTION
The illustrations above show an example of an AIR outdoor unit. Different versions of the outdoor unit are available.

20
Electrical installation
Safety
It is important to check that wires are not damaged or squeezed during connection and use.
Connections overview
1. Power supply socket 230V for Compact P2
2. Grommets (a: Transmission cable between indoor unit and Compact P2, b: Sensor T18 for buffer tank, c: 3-way valve for SHW tank)
3. Screw terminal for controlling heating/cooling (HEAT+COM: heating control. COM+COOL: cooling control)
4. Communication cable for AIR heat pump outdoor unit (RJ45)
5. RJ45 port for T21, T22 and anode in SHW tank
6. Port for supplemental electric heating in SHW tank
7. Power supply cable for supplemental electric heating in buffer tank
8. Electrical connection cable for AIR heat pump indoor unit + Compact
9. Electrical connection cable for AIR heat pump outdoor unit
10. Connection for the user’s internet router via LAN cable
11. Connection of PC via USB cable
12. 8-pin port with the possibility of connecting accessories (the 8-pin plug is delivered with the instruction manuals)
13. Cable glands for external electrical connections that you install in the terminal blocks at the back of the metal plate.
ATTENTION
All work must be carried out by qualified persons and in compliance with existing legislation and regulations.
ATTENTION
It is important that the power is off, if you do work to the electrical components of the unit.
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acb