Metro Therm METROAIR AQUA HPM User manual

HEAT PUMPS
08:965-1609 Manual article no. 714273999
Manual
METROAIR AQUA
HEAT PUMP MODULE
DOMESTIC HOT
WATER HEAT PUMP
08:965-1609
EN

2
METROAIR AQUA HEAT
PUMP MODULE (HPM)
METRO article number: 156002601

3
Table of Contents
1 Transport 6
1.1 Delivery mode 6
1.2 Storage 6
1.3 Transport with forklift 6
1.4 Unloading the heat pump 6
2 Dimensions 7
3 About the product 8
3.1 General 8
3.2 Scope of delivery 8
3.3 Product description 8
3.4 Operation of the METROAIR AQUA 8
3.5 Technical data 9
3.6 Performance data 9
3.7 Refrigerant circuit – description 10
3.8 Requirements for the water circuit 11
3.8.1 Water circuit - diagram 12
3.9 Electrical diagram Optima 172 Control 13
3.10 Fan capacity 14
4 Before Installation and start up 15
4.1 Important safety instructions 15
4.1.1 Cooling system – safety instructions 15
4.1.2 Electrical circuit – safety instructions 15
4.1.3 Water circuit – safety instructions 15
4.1.4 Users 15
5 Installation 16
5.1 Location 16
5.2 Set-up sequence 16
5.3 Water connections 17
5.4 Location of connecting pipes 17
5.5 Connection of condensate drain 17
5.6 Air intake, air exhaust and connections 18

4
6 Commissioning 19
6.1 Leak test 19
6.2Commissioning of the water circuit 19
6.3 Commissioning of the air circuit 19
6.4 Commissioning of the electrical circuit 19
7 Controls and Operations 20
7.1 Control panel Optima 170 20
7.2 Operation 20
7.3 Main Menu 20
7.3.1 Display view (main menu) 22
7.4 Service menu 22
7.4.1 Changing settings in the service menu 22
7.4.2 Service menu points 22
7.5 Table for set points 31
7.6 Table for defrosting 32
7.7 Functional description 32
7.7.1 Controlling Domestic hot water heat pump with Optima 170 33
7.7.2 Performance 33
7.7.3 The function of the heat pump 33
7.7.4 Water heating 34
7.7.5 Fan operation 34
7.7.6 Defrosting 36
7.8 Safety features 36
7.8.1 High pressure switch 36
7.8.2 Safety breakers 36
7.9 Alarms 36
7.9.1 PE: High pressure switch alarm 36
7.9.2 Er6: Atypical evaporator temperatures 36
Table of Contents

5
8 Maintenance 37
8.1 Environmental requirements 37
8.2 Cooling system and fan 37
8.3 Condensation and condensate drain 37
8.4 Water circulation and water tank 37
8.4.1 Pressure relief valve 37
9 Disassembly/decommissioning 38
10 Troubleshooting 39
10.1 The heat pump does not supply hot water 39
11 Warranty provisions 40
12 Declaration of conformity 41
13 Product and installer information 42

6
1 Transport
Immediately upon receipt, examine the Heat Pump Module (HPM) to make sure that it is intact
and undamaged. If not, inform this to the shipping company immediately. All shipments are the
responsibility of the recipient unless otherwise agreed.
1.1 Delivery mode
METROAIR AQUA HPM is delivered without condensate drain tube and the safety equipment for
the water circuit.
1.2 Storage
METROAIR AQUA HPM must be stored and transported upright free of water and within its
packaging.
Transport and storage may take place at temperatures between -10 °C and +50 °C. If the unit
has been transported or stored at sub-zero temperatures leave the unit at room temperatures
for 24 hrs before commissioning.
1.3 Transport with trolley
When transporting the METROAIR AQUA HPM by trolley the unit shall be in its disignated trans-
portation box and transportet upright. The box shall be lifted from the disignated side.
Make sure that the trolley does not damage the cabinet or the various connections.
1.4 Tilting of unit
When carefully and manually transporting the METROAIR AQUA HPM over a short distance to
its final location the unit can be tilted up to 45°. If this limit is exceeded, the METROAIR AQUA
must be left in its normal upright position for at least 1 hour before it is started.

7
2 Dimensions
1 Inlet air Ø 160 mm
2 Outlet air Ø 160 mm
3 Cold water connection Ø15
4 Hot water connection Ø15
5 Circuit board
6 Electrical junction box
7 Condensate drain 3/4” hose connection
8 Condenser
9 Compressor
10 Capacitor
11 Evaporator
12 Fan
13 Thermostatic expansion valve
General arrangement METROAIR AQUA HPM
All dimensions in mm.
1
1
2
2
3
3
4
4
5
5
6
6
A A
B B
C C
D D
990300005 BVVP topmodul dimensions
508
140
134
118,5
575
580
142
145
408
400
41
5
12
11
9
8
10
7
6
4
3
1
2
13

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3 About the product
3.1 General
The heat pump module (HPM) has been designed and produced according to all relevant EU
guidelines (please also refer to the EEC-declaration of conformity).
3.2 Scope of delivery
• Hot water heat pump unit with built-in control.
• External temperature sensors T7 and T8.
• Manual including installation guidelines, operating instructions and technical data.
3.3 Product description
The METROAIR AQUA HPM is a hot water heat pump, ready made for installation. It has
been designed for domestic hot water application but can also be used for e.g. space heating
applications. It consists of cabinet, components for refrigerant, air and water circuits as well as
control panel, and control and monitoring equipment designed for automatic operation.
The application area and operating principles of the heat pump are specified in this manual.
3.4 Operation of the METROAIR AQUA HPM
The control starts the compressor when hot water is needed. The compressor operates until the
water in the water tank (T8) reaches the set temperature. Usually, the METROAIR AQUA HPM
can produce enough hot water to cover the need of a household of 4 persons.
If the METROAIR AQUA HPM is not able to produce enough domestic hot water, an electrical
immersion heater can be installed in the adjacent water tank and activated by the HPM.
This way more domestic hot water can be produced. It is possible to set the temperature to
which the electrical immersion heater should heat the water.The electrical immersion heater
should only be used when there is a need, as it consumes significantly more energy that the
compressor.
Any work carried out on
this unit must only be done by
skilled personnel.
Take all necessary precautions to
avoid accidents.

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Dimensions (LxWxH) mm 580x575x508
Weight kg 30
Air duct connections mm Ø160
Water connections (compression fittings) mm Ø15
Condensate outlet (hose connection) “3/4
Maximum allowed water pressure MPa 1.0
Maximum allowed water temperature in tank °C 90
Allowed flow range external circulation pump
(not included)
I/hr 200-600
Refrigerant/quantity -/kg 134a/0.65
Electrical connections V/Hz 230/50 (L1, N, G)
Fuse size A10 (13)
Max. water temperature (heat pump only) °C 60
Max. water temperature (heat pump and immer-
sion heater)
°C 65
Air flow range (@100 Pa) m3/h 100-330
Temperature range for compressor operation °C -5 – + 35
Sound level 2 m in front om unit at 100% air flow dB(A) 44
COP acc. to EN-16147 class L , 7°C inlet air -2.4
COP acc. to EN-16147 class L , 20°C inlet air -3.3
3.6 Performance data
Performance specified for heating of domestic water from 10°C (cold water) to 52.5°C (domes-
tic water) in a connected water tank of 300 l and extract air temperature 7°C:
3.5 Technical data

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3.7 Refrigerant circuit – description
The cooling system is optimized for extracting the heat from the inlet air. Via the cooling system
the extracted heat is transferred to the water. The process is only possible with the addition of
additional external energy in the compressor. The cooling system is a closed system where the
HCFC-free refrigerant R134a is the energy carrier.
In the evaporator, heat is absorbed from the air and transferred to the refrigerant at low evapo-
ration temperature. Refrigerant in gaseous form is fed to the compressor, in which it is raised up
to a higher pressure and temperature level and transported to the condenser. In the condenser
the refrigerant condense and the heat absorbed in the evaporator plus some of the compressor
energy is transferred to the water.
Finally the high condensing pressure is throttled to the evaporating pressure using an expansion
valve and the refrigerant can again absorb heat from the extract air in the evaporator.
3.7.1 Refrigerant circuit – diagram
3 About the product
Air temp
sensor
(T5)
Evaporating temp
sensor (T6)
Evapo
rator
Filter drier
Compressor
Thermostatic
expansion
valve
HP-switch
Condenser
Cold water
inlet
Hot water
outlet
Solonoid valve
Check-
valve
Fan
Hot water outlet

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3.8 Requirements for the water circuit
The water circuit must be constructed in accordance with local norms and standards. The water
used must be of drinking water quality when charged to the system. Material compatibility in
the whole system must be ensured.
The pipe sizes for on-site installation shall be defined based on the available water pressure
as well as the expected pressure loss in the pipe system. The water circuit shall be designed
according to the drinking water installation regulative in force. Incorrect material combinations
in the water circuit can lead to corrosion damage due to galva-nic corrosion. This requires special
attention when using galvanized components and components that contain copper.
As for all pressurized vessels the heat pump associated water tank has to have an approved
safety valve (pressure setting depending on local rules and regulations) and a non return/
check valve on the cold water inlet. Max. working pressure is 1.0 MPa (10 bar) and max. inlet
temperature is 65°C. Dirt must be avoided in the pipe system (if necessary flush the pipes before
the heat pump is connected)!

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3.8.1 Water circuit - diagram
3 About the product
The HPM heats up the water by the principle of repeatable circulations to reach set point tem-
perature, typically, 5-15 passes to fully heat op a water tank starting with cold water.
Therefore the following should be observed during installation:
- The hot water inlet from the heat pump shall be placed, e.g., 1/3 down from the top to ensure
that hot water is available for use while the heat pumpe heats up the lower 2/3 of the water
tank.
- The heat pump control sensor,T8, shall be located around the how water inlet from the heat
pump. If a higher readyness of hot water is required the sensor location can be lowered.
- Sensor T7 can be used for optional display of temperature in the top of the tank.
- If an optional electrical heater is controlled by the HPM sensor T7 shall be installed ABOVE the
electrical heating element sensor sensor T7 is controling sensor for the electrical heater. It is
recommended to use a safety breaker which will disengage at 80°C.
- A fixed speed pump shall be installed on the cold water return to the HPM. A pump rate
between 200-600 l/h is advisable. Higher pump rates gives better HPM performance but also
consumes more circulation pump power.

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EP
M1
KP
NT
Skal jordforbindes jvt. stærkstrømsreglementet
Must have earth connection
Muss erdung haben
Tilslutning Datalog
Connection Datalog
Anschluss Datalog
MA4-
NT-
EP-
P-
T5-
T6-
T7-
T8-
T9-
T10-
80°C
Føler før køleflade
Sensor before the evaporator
Fühler bevor die kühlfläche
Føler Køleflade
Sensor on the evaporator
Kühlfläche fühler
Føler tank top
Sensor in the top of the tank
Oberer speicher fühler
Føler tank bund
Sensor in the bottom of the tank
Unterer Speicherfühler
Ekstra funktion
Ekstra Funktion
Extra Funktion
Føler start/stop
Sensor start/stop
Fühler start/stop
Tilslutning Datalog
Connection Datalog
Anschluss Datalog
T5-
T6-
T7-
T8-
T9-
T10-
Magnetventil afrimning
Magnetventile Abtau
Solonoid valve Defrost
Nettilslutning 1x230V 50Hz
sikring max. 13 Amp
end main: 1x230V 50Hz
fuse mx. 13 Amp
Netzende: 1x230V 50Hz
sicherung max 13 Amp
El-patron 1,5kW
Electric heating element 1,5kW
Heizstab 1,5kW
Højtrykspressostat
High pressure switch
Hochdruckpressostat
12 12
H1
12 12
H2
12
12
H6
1212
H7
1212
H8
12341234
L4
12341234
L5
12 3 12 3
H3
12 312 3
H5
12341234
L6
T7
T8
VL1
MA4
BU
BN
PE BU
BN
PE
M1
CPE
R
S
CPE
R
S
PE
1 2 1 2
1 2
1 2
1
1
1
1
1
1 1
1
1
1
1
1
11
2 2
2
2
2
2
2
2
2
2
2
2
2 2
3
3
3
3
3
3
3
3
3
4
4
4
4
4
4
5
PE PEPE PEPE PEPE PE
Q1=1,6A Q2=5A
H1
H2
H3
H4
H5
H6
H7
H8
L1
L2
L4
L5
L3 L6
F
F
F
F
F
F
F
N
N
N
N
N
N
1
1
1
1
1
1 1
1
1
1
1
1
11
2 2
2
2
2
2
2
2
2
2
2
2
2 2
3
3
3
3
3
3
3
3
3
4
4
4
4
4
4
5
PE PEPE PEPE PEPE PE
1234 1234
L2
BuBu
-M2
YeYe
1234 1234
L1
12345 12345
L3
T5
T6
M1- EC blæser forsyning
EC fan supply
EC Lüfter strom
M2- EC blæser kontrol
EC fan control
EC Lüfter regeln
T10
T9
Aux relæ
Aux Relay
Aux Relais
PEPE
1122
H4
PEPE
Pumpe
Pump
Pumpe
Included
Excluded
Excluded
Included
Included
Excluded
3.9 Electrical diagram Optima 172 Control

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0,0
50,0
100,0
150,0
200,0
250,0
0 50 100 150 200 250 300 350 400
Pressure [Pa]
Air volume flow [m3/h]
100%
75%
50%
3.10 Fan capacity
It is recommended to keep the external pressure loss below 100 Pa.
3 About the product

15
4.1.1 Cooling system – safety instructions
Before beginning repair and service the skilled service technician must ensure that the refrige-
rant is discharged to a level at which the execution of the work can be done safely and secure.
When opening the heat pump cooling circuit for service and repair special attention much be
paid especially when working with an open flame (soldering, welding etc.) to prevent the out-
break of fire.
4.1.2 Electrical circuit – safety instructions
When connecting the METROAIR AQUA HPM to the power supply, the national rules and norms
must be adhered to. Possible additional requirements posed by the local energy supplier must
also be followed. The heat pump unit is connected to the power supply by L1, N, G and with a
min. 3 mm isolation distance in the breaker.
4.1.3 Water circuit – safety instructions
Only water of drinking water quality must be used. During installation, attention must be paid
to the choice of materials and it must be ensured that chosen materials work together without
problems in the entire circuit.
Special attention must be paid when using galvanised components and components containing
copper!
Safety equipment must be installed to prevent over pressure in the system. Always use a max.
1.0 MPa (10 bar) bar safety valve and a stop valve (approved according to heating and plumb-
ing regulations). All pipe work has to be installed according to plumbing and heating regula-
tions.
4.1.4 Users
The METROAIR AQUA HPM is not intended for use by persons (including children) with reduced
physical, sensory or mental capabilities or lack of experience and knowledge unless they
have been given supervision or instruction concerning use of the appliance in a safe way and
understand the hazards involved.
Children should be supervised to ensure that they do not play with the appliance. Cleaning and
user maintenance shall not be made by children without supervision.
4 Before Installation and start up
When working on the
METROAIR AQUA HPM, the main
power supply must always be
disconnected– pull out the plug!

16
The domestic hot water heat pump must only be installed by trained personel and in accordance
with the local building codes.
5.1 Location
The METROAIR AQUA HPM must only be installed in a frost-free room. The installation location
should comply with the following criteria:
• Room temperature between 5°C and +35°C.
• Drain possibility for condensate drain.
• No abnormal dust concentration in the air.
• A levelled solid shelf or wall brackets cabable of a load of approx. 50 kg.
• It is necessary to ensure that ther is sufficient space around the unit for maintenance and
service.
5.2 Set-up sequence
1. Remove the top packaging.
2. Removed the compressor transportation fixtures (2 pieces, shown by arrows)
3. Lift the METROAIR AQUA HPM from the cardboard base and place it on its final destination,
e.g., a shelf or disignated wall brackets.
4. Ensure that the METROAIR AQUA HPM is levelled with a max. deviation of +/- 1 deg.
5. The unit can be fixed by screws at the designated areas below the unit (see figure) with a
max. penetration length of 40 mm.
5 Installation
1
1
2
2
3
3
4
4
5
5
6
6
A A
B B
C C
D D
990300007 BVVP topmodul hyldeknægte
1
1
2
2
3
3
4
4
5
5
6
6
A A
B B
C C
D D
990300007 BVVP topmodul hyldeknægte
Screws must only be applied in the darkened areas. Max. penetration of 40 mm.
1
1
2
2
3
3
4
4
5
5
6
6
A A
B B
C C
D D
990300009 BVVP topmodul transport beslag
1
1
2
2
3
3
4
4
5
5
6
6
A A
B B
C C
D D
990300009 BVVP topmodul transport beslag

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1
1
2
2
3
3
4
4
5
5
6
6
A A
B B
C C
D D
990300008 BVVP topmodul drain
Water trap. Min. 60 mm
of standing water
Condensate drain, Ø 19 mm
connection (3/4”)
5.3 Water connections
The water connections are located on the left hand side of the HPM heat pump
• Ø15 cold water inlet, lowest connection
• Ø15 hot water outlet, highest connection
The maximum working pressure is 1.0 MPa (10 bar) and the maximum working temperature is
65°C.
A fixed speed circulation shall be installed in order to tranfer the heat from the heat pump to the
water tank. Flow rates between 200-600 l/hr shall be ensured and it is recommended to install
the circulation pump on the HPM water inlet pipe.
Dirt in the pipe work must be avoided. After installation of the external pipes flush if required
before connection of the domestic hot water heat pump.
When installing the pipes please ensure that the pipe connections are not excessively stressed.
Use a pipe wrench to relax torque forces on the pipe connections!
5.4 Connection of condensate drain
While the METROAIR AQUA HPM is running, condensate will form, which is to be discharged
to the sewage drain via the condensate drain pipein the bottom of the unit. The quantity of
condensate depends upon the humidity of the air fed to the METROAIR AQUA.
The condensate connecting branch must be equipped with an air tight water trap and run to a
drain.The water trap must contain a standing water column of at least 60 mm.
5.5 Air intake, air exhaust and connections
The inlet air must not be polluted with aggressive components (ammonia, sulphur, chlorine etc.)
as components parts of the heat pump unit may be damaged. The air also needs to be free of
dust and other particles.
Inlet and outlet ducts must be made of rigid smooth pipes to minimize pressure losses. Please
take into account the fan working pressure and the ducts pressure losses during dimensioning
of the duct system (see technical data).
The two connections to the heat pump are Ø 160 m.
It is advised to install the air ducts near the heat pump, levelled or with a slight slope away from
the air in- and outlet to avoid ingress of condensed water from the duct system to the heat
pump.
When air ducts are connected to the outside of a building, a low resistance non return flap
should be installed to ensure that no cold air is entering the room during winter times when the
heat pump is not operating.
Neglecting to install a drain
trap can lead to water damage
or damage to METROAIR AQUA
HPM. If the drain trap is not in-
stalled correctly the product war-
ranty is not valid.
The METROAIR AQUA HPM
must only be started with the water
circuet filled

18
All air ducts have to be insulated after they have been installed to reduce heat loss and noise
level. Insulation has to be applied to protect against external condensation on the cold exhaust
duct.
It is recommended to mount a flexible connection between the air duct and duct connection
to ease future service of the unit.
It is also recommended to install silencer units in between the heat pump unit and the
ventilation system to avoid potential travel of noise from the unit to the ventilation system.
5.6 Connecting temperature sensors, circulation pump and auxilary electrical
heater
All electrical connections are located in the junction box on the left hand side of the unit.
Undo the junction box cover in order to connect external temperature sensors, pump, and
heating element.
Temperature sensor T8 is the sensor which controls the start/stop of the heat pump. The T8
sensor shall be installed at such height on the water tank that there is sufficent hot back-up
water above the sensor but not so low that the heat pump will start every time hot water is
being used.
It is recommended to install the T8 sensor in the tank at around the same height as the inlet
from the heat pump. i.e., around in the middle of the tank.
If there is no appropiate sensor pocket available on the tank at this height, the sensor can also
installed on the outside of the tank, as long as good tank contact and proper insulation to the
surroundings is ensured.
Temperature sensor T7 is the temperature sensor which controls the auxilary electrical heater. If
no electrical heater is installed T7 is just used for monitoring purposes.
The T7 sensor shall always be installed above the electrical heater and a high temperature safety
braker shall be installed in the electrical circuit.
The power of the auxilary electrial heater must not exceed 1,5 kW. In case a larger heater is
required a reley/contactor setup shall be installed.
Do not drill any holes for
fittings etc. in the unit appart from
those allowed for fixtation.
This could potential damage the
product causing it to be having to
be scrapped.
The METROAIR AQUA HPM
must always be disconnected from
the power before the top cover of
the unit is removed!
When the unit is disconnected from
the power, please wait until the fan
has stopped before dismantling the
top cover!
5 Installation
1
1
2
2
3
3
4
4
5
5
6
6
A A
B B
C C
D D
990300008 BVVP topmodul drain

19
6 Commissioning
6.1 Leak test
After installation it is necessary to check that the entire water installation is tight.This is
accomplished by performing a water leak test.Also check that the drain water trap on the
condense water hose/pipe has a min. height of 60 mm and that the drainage is unobstructed.
6.2 Commissioning of the water circuit
Fill the water tank/system via the cold water connecting branch and deaerate.
6.3 Commissioning of the air circuit
Ensure that the air in- and outlet paths are open and ready for use.
6.4 Commissioning of the electrical circuit
Power up the unit. A counter displays the numbers 1 to 9 followed by display of the controller
model (172) for 3 sec. and the software version for 3 sec. Then the top of water tank
temperature is displayed and the unit engages operation.
The METROAIR AQUA HPM is now ready for use.

20
7 Controls and Operations
7.1 Control panel Optima 172
The METROAIR AQUA HPM is delivered with an Optima 172 control with factory settings so
that the heat pump is ready for operation without additional adjustments. The factory settings
are default settings that should be adjusted in accordance to the operational needs and user
requirements in order to achieve optimal performance and utilisation of the system.
7.2 Operation
The value of the relevant menu item is displayed when the key/key combination below is
pressed. The value can be changed using the arrow keys when the key/key combination is held
down simultaneously.
7.3 Main Menu
P1: Mode
The “Mode” key is pressed and held.Then the setting can be changed using the arrow keys.
With this key it is possible to switch between the functions: Holiday, automatic operation,
constant operation and timer controlled constant operation (Mode 0, 1, 2, 3).
Mode 0: Unit holiday mode. The heat pump is now turned off and only the controller is
active. The heat pump does not start when heating is required but legionella control is active if
selected in E8.
Mode 1: The fan only runs when the domestic water is being heated. At menu point E25 the
desired fan speed is set between 0-100 %.
Mode 2: The fan runs even when the compressor is stopped.
This function is called: Constant extraction from the residence.
At menu point E25 the desired fan speed is set between 0-100 %.
Mode 3: The fan runs for a set period of time, even when the compressor is stopped, before it
returns back to normal operation
At menu point E26 the desired fan speed is set between 0-100 %.
At menu point E17 select whether “Mode 3” is to run until the next manual change (E17 = 0)
or if “Mode 3” is to be active for a specific period of time (E17=1 and E18: 0-10 hours) thereaf-
ter returning to “Mode 1”.
Options: 0-3
Factory setting: 1