nilan Compact P2 User manual

INSTALLATION INSTRUCTIONS
Compact P2 / Compact P2 Polar - GEO
Gateway
CTS602 HMI BY NILAN
Version 1.00 - 01.03.2022
M24 Compact P2 GEO GB

2
Table of contents
General information
Safety ............................................................................................................................................................................................................4
Power supply .........................................................................................................................................................................................4
Heat pump domestic hot water ..........................................................................................................................................................4
Heat pump for central heating ...........................................................................................................................................................4
Water quality requirements ......................................................................................................................................................................5
Requirements to quality of water ......................................................................................................................................................5
Introduction ..................................................................................................................................................................................................5
Documentation ......................................................................................................................................................................................5
Unit type ........................................................................................................................................................................................................6
Product description ..............................................................................................................................................................................6
The unit ...................................................................................................................................................................................................7
Overview of temperature sensors ....................................................................................................................................................8
Dimensional drawing ............................................................................................................................................................................8
Pipe diagram ..........................................................................................................................................................................................9
Accessories ................................................................................................................................................................................................ 10
Electrical pre-heating element for frost protection of the unit ................................................................................................ 10
CO2 sensor .......................................................................................................................................................................................... 10
Expansion PCB .................................................................................................................................................................................... 10
EM-box ................................................................................................................................................................................................. 10
DTBU damper ..................................................................................................................................................................................... 10
Extension cable HMI control panel .................................................................................................................................................. 11
Cover plate HMI user panel .............................................................................................................................................................. 11
Safety group ....................................................................................................................................................................................... 11
Safety group with scalding protection ........................................................................................................................................... 11
Flexible sound damper ...................................................................................................................................................................... 11
Pollen filter .......................................................................................................................................................................................... 12
Trolley .................................................................................................................................................................................................. 12
SHW hot water tank ........................................................................................................................................................................... 12
Set-up
Installation ................................................................................................................................................................................................. 13
Transport into the building .............................................................................................................................................................. 13
Positioning the unit ............................................................................................................................................................................ 13
Ground collector loop ............................................................................................................................................................................... 14
Examples of the laying ...................................................................................................................................................................... 14
Electrical installation
Safety ................................................................................................................................................................................................... 15
Connections overview ...................................................................................................................................................................... 15
Electrical connections unit ...................................................................................................................................................................... 16
Power supply ...................................................................................................................................................................................... 16
GEO3, GEO6 and GEO9 ....................................................................................................................................................................... 16
Change from 400V to 230V ............................................................................................................................................................. 17
Circulation pump ................................................................................................................................................................................ 18
Connecting a gateway ............................................................................................................................................................................. 18
Connecting to the internet ............................................................................................................................................................... 18
Location on the unit ........................................................................................................................................................................... 18
HMI Control panel ..................................................................................................................................................................................... 19
Moving the control panel .................................................................................................................................................................. 19
Wall bracket ........................................................................................................................................................................................ 19
Electrical connections accessories ........................................................................................................................................................ 20
SHW hot water tank ........................................................................................................................................................................... 20
User selection 1 .................................................................................................................................................................................. 20
Smart Grid ........................................................................................................................................................................................... 21
External electrical pre-heating element ........................................................................................................................................ 22
Mounting an expansion PCB on the CTS602 circuit board ......................................................................................................... 23
User selection 2 .................................................................................................................................................................................. 25
EM-box (damper solution) ................................................................................................................................................................ 25
DTBU damper solution ...................................................................................................................................................................... 26
Fire thermostat / external fire automation system .................................................................................................................... 26
Joint alarm ........................................................................................................................................................................................... 27
External heat supply .......................................................................................................................................................................... 27
External underfloor heating control ............................................................................................................................................... 28
Plumbing installation
Condensate drain ..................................................................................................................................................................................... 29
Important information ...................................................................................................................................................................... 29
Hot water tank .......................................................................................................................................................................................... 30

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Connection overview .........................................................................................................................................................................30
Connection ...........................................................................................................................................................................................30
Requirements to quality of water ...................................................................................................................................................31
Hot water circulation .........................................................................................................................................................................31
Supplementary coil ............................................................................................................................................................................31
Softened water ...................................................................................................................................................................................31
Central heating ..........................................................................................................................................................................................32
Connection overview .........................................................................................................................................................................32
The brine circuit ..................................................................................................................................................................................32
Check list for the central heating system prior to start-up ........................................................................................................33
Plumbing connections for accessories ..................................................................................................................................................34
Safety group ........................................................................................................................................................................................34
Safety group with anti-scald protection ........................................................................................................................................34
Passive cooling module .....................................................................................................................................................................35
Passive cooling function ....................................................................................................................................................................36
Domestic hot water tank ...................................................................................................................................................................37
Connecting to SHW hot water ..........................................................................................................................................................38
Connection to supplementary coil in SHW hot water tank .........................................................................................................39
Connecting to DHW hot water ..........................................................................................................................................................39
Ventilation installation
Duct system ...............................................................................................................................................................................................40
Legislation ............................................................................................................................................................................................40
Ducts .....................................................................................................................................................................................................40
Ventilation unit ...................................................................................................................................................................................40
Extract air ............................................................................................................................................................................................41
Supply air .............................................................................................................................................................................................41
Roof terminals .....................................................................................................................................................................................41
Installation example ...........................................................................................................................................................................41
Balancing ....................................................................................................................................................................................................42
Important information .......................................................................................................................................................................42
Start-up
Central heating ..........................................................................................................................................................................................43
Filling with water .................................................................................................................................................................................43
Topping up water ................................................................................................................................................................................43
Check the particle filter .....................................................................................................................................................................43
Troubleshooting
Emergency operation ...............................................................................................................................................................................44
Emergency mode domestic hot water ............................................................................................................................................44
Emergency mode central heating ...................................................................................................................................................45
Domestic hot water ..................................................................................................................................................................................46
Errors and solutions domestic hot water .......................................................................................................................................46
Central heating ..........................................................................................................................................................................................46
Errors and solutions central heating ..............................................................................................................................................46

4
General 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.
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 fitted with the following safety equipment.
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
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
replace 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., to
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.
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.

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Unit type
Product description
Compact P2 is a ventilation unit with heat recovery, that has a built-in heat pump, which is used for the production of domestic hot wa-
ter, and which is also able to heat and cool the home by central heating via a ground source 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 GEOthermal heat pump heats the home via floor heating or lowtemperature radiators. It retrieves
the energy from the earth. The heat pump has an electrical power supply to help it to function during very cold periods. GEO can cool
the home in the summer with passive cooling, either through the underfloor heating system or fan coils.
The GEO ground source 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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The 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
GEO:
22. Safety valve and manometer for the central heating circuit
23. Inverter-controlled DC compressor
24. Filling tap and particle filter for the central heating circuit
25. Integrated circulation pump for the brine circuit
26. Supplemental electric heating for central heating 2kW
27. Expansion vessel for central heating- and brine circuit 2x8
litres

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Overview of temperature sensors
Dimensional drawing
Temperature sensors in the unit
T1: Outdoor air
T2: Supply air
T4: Extract air after heat exchanger
T5: Condenser
T6: Evaporator
T10: Extract air
Temperature sensors in the hot water tank
T11: Top of tank
T12: Bottom of tank
Temperature sensors Brine
T13: Brine supply flow
T14: Brine return flow
Temperature sensors GEO
T16: Before condenser
T17: After condenser
T18: Supply flow central heating
T20: Outdoor temperature
T35: Pressure pipe temperature
Connections:
1. Outdoor air
2. Supply air
3. Extract air
4. Discharge air
Weight: 268 kg.
All listed measurements are in mm.
T5
T6 T4
T11
T1/T20
T2
T12
T10
T17/T18
T16
T13
T14
T35
204
900
Ø160
204
900
187
610
2245
109
108 108
13
24

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Pipe diagram
* Everything within the red box is Nilan delivery.
1. Evaporator
2. Service valve for low pressure
3. Low-pressure pressostat
4. Compressor
5. High-pressure pressostat
6. Condensor
7. Expansion valve
8. Sight glass with humidity indicator
9. Service valve for high pressure
10. Combi filter
11. Connection 1" (Internal thread)
12. Flexible hose 1"
13. Filling tap
14. Shut-off valve
15. Particle filter
16. Safety valve 3,5 bar
17. Manometer (not mounted for central heating circuit)
18. Ball valve
19. Circulation pump 130 mm
20. Brine pressure switch 0,5/1,1 bar
21. Flexible hose 10 mm
22. Expansion vessel 8 L
23. Automatic air vent valve 3/8"
24. Immersion heater 2 kW
25. Temperature sensor T18
26. Safety valve 2,5 bar (not mounted)
27. Connection 3/4" ( thread)
28. Relief valve
36. Circulation pump
40. Temperature sensor T13
41. Temperature sensor T14
42. Temperature sensor T16
43. Temperature sensor T17
46. Outdoor temperature sensor T20
ATTENTION
An overflow valve must be installed point 28 in the floor heating circuit, with a circulation pump with fixed speed. Alter-
natively, remove the individual thermostats, to ensure sufficient flow.
TT
TT
PI
PZAL
TT TT TT
TT
TC
PTL PTL
M
3~
TT
23
22
21
40
20
18
19
18
17
16
11
12
14
13
15
14
13
12
11
18
23
22
21
14
13
14
14
15
41
46
43
42
27 36
28
25 26
27
17
24
10
9
8
7
6
5
4
3
2
1
Central heating
Supply flow
Cooling module
Return flow
GEO heat pump
Ground collectors

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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.