Midea MHC-V9W/D2N1 Operating instructions

INSTALLATION & OWNER’S MANUAL
Thank you very much for purchasing our product.
Before use, please carefully read this manual and keep it for future reference.
MHC-V5W/D2N1
MHC-V7W/D2N1
MHC-V9W/D2N1
MHC-V10W/D2N1
MHC-V12W/D2N1
MHC-V14W/D2N1
MHC-V16W/D2N1
MHC-V12W/D2RN1
MHC-V14W/D2RN1
MHC-V16W/D2RN1
Original instructions

Figure 1）Figure 2）
Wiring diagram:12-16kW(3-phase) for examples
5/7/9 kW
10/12/14/16 kW
Please remove the hollow
plate after installation.
Hydraulic System 5/7/9 kW
10/12/14/16 kW

READ THESE INSTRUCTIONS CAREFULLY BEFORE
INSTALLATION. KEEP THIS MANUAL IN A HANDY PLACE
FOR FUTURE REFERENCE.
IMPROPER INSTALLATION OR ATTACHMENT OF
EQUIPMENT OR ACCESSORIES COULD RESULT IN
ELECTRIC SHOCKS, SHORT-CIRCUITS, LEAKS, FIRE OR
OTHER DAMAGE TO THE EQUIPMENT. BE SURE TO
ONLY USE ACCESSORIES MADE BY THE SUPPLIER
WHICH ARE SPECIFICALLY DESIGNED FOR USE WITH
THE EQUIPMENT AND HAVE INSTALLATION DONE BY A
PROFESSIONAL
ALL ACTIVITIES DESCRIBED IN THIS MANUAL SHALL BE
CARRIED OUT BY A LICENSED TECHNICIAN.
BE SURE TO WEAR ADEQUATE PERSONAL
PROTECTION SUCH AS GLOVES AND SAFETY GLASSES
WHEN PERFORMING INSTALLATION, MAINTENANCE
OR SERVICE TO THE UNIT.
IF UNSURE OF INSTALLATION PROCEDURES OR USE,
CONTACT YOUR DEALER FOR GUIDANCE
■ Domestic hot water tank (field supply)
A domestic hot water tank can be connected to the unit(with or
without electrical booster heater is both OK).
There is a heat exchanger in the tank. If the heat exchanger
outside is enameled, the heat exchanger surface must be bigger
than 1.7m2 for matching the 10kW ~16kW unit and the heat
exchanger surface needs to be bigger than 1.4m2 for matching the
5kW~9kW unit.
■ Room thermostat (field supply)
Room thermostat can be connected to the unit(room thermostat
should be kept away from heating source when selecting the
installation place).
■ Solar kit for domestic hot water tank (field supply)
An optional solar kit can be connected to the unit.
■ Remote alarm kit (field supply)
A remote alarm kit can be connect to the unit.
■ Operation range
1. Heat pump capacity
2. Required heating capacity (site dependent)
3. Additional heating capacity provided by backup heater
Capacity/Load
Outdoor temperatureTbivalent
1
2
3
1 INTRODUCTION
1.1 General information
■ These units are used for both heating and cooling applications.
They can be combined with fan coil units, floor heating
applications, low temperature high efficiency radiators, domestic
hot water tanks (field supply) and solar kits (field supply).
■ A wired user interface is supplied with the unit to control the
installation.
■ The unit is delivered with an integrated backup heater for
additional heating capacity during cold outdoor temperatures. The
backup heater also serves as a backup in case of malfunctioning
and for freeze protection of the outside water piping during winter
time. The capacity of backup heater for different units is listed below.
CONTENTS PAGE
1
1 INTRODUCTION.....................................................................1
2 ACCESSORIES......................................................................2
3 SAFETY CONSIDERATIONS.................................................2
4 BEFORE INSTALLATION......................................................3
5 IMPORTANT INFORMATION REGARDING THE
REFRIGERANT USED............................................................4
6 SELECTING INSTALLATION SITE........................................4
7 PRECAUTIONS ON INSTALLATION.....................................5
8 TYPICAL APPLICATION EXAMPLES...................................7
9 OVERVIEW OF THE UNIT.....................................................18
10 START-UP AND CONFIGURATION.....................................35
11 TEST RUN AND FINAL CHECK...........................................49
12 MAINTENANCE AND SERVICE...........................................49
13 TROUBLESHOOTING..........................................................49
14 TECHNICAL SPECIFICATIONS...........................................55
HEATING MODE COOLING MODE
T4
T1
20
46
-5
5 10 25
10
Unit
1-phase 3-phase
10 12 14 16 12 14 165 7
Capacity of
backup heater 4.5kW(optional)
3kW(standard)
3kW
(optional)* 4.5kW
port (CN6) for T1 in the main
control board of hydraulic should connect to the corresponding
port in the backup heater box 9.2.2
Function diagram of hydraulic compartment
9

T4 Outdoor temperature(°C)
T1 Water flow temperature(°C)
DOMESTIC WATER HEATING MODE
T4
T1
30
43
-2
-20
■ No heat pump operation, backup heater or boiler only.
1.2 Scope of this manual
This installation & owner's manual describes the procedures for
installing and connecting all monobloc outdoor unit models.
DANGER
Indicates an imminently hazardous situation which if not
avoided, will result in death or serious injury.
WARNING
Indicates a potentially hazardous situation which if not
avoided, could result in death or serious injury.
CAUTION
Indicates a potentially hazardous situation which, if not
avoided, may result in minor or moderate injury. It is also
used to alert against unsafe practices.
NOTE
Indicates situations that could only result in accidental
equipment or property damage.
■ Before touching electric terminal parts, turn off power switch.
■ When service panels are removed, live parts can be easily
touched by accident.
Never leave the unit unattended during installation or servicing
when the service panel is removed.
■ Do not touch water pipes during and immediately after operation
as the pipes may be hot and could burn your hand. To avoid injury,
give the piping time to return to normal temperature or be sure to
wear protective gloves.
■ Do not touch any switch with wet fingers. Touching a switch with
wet fingers can cause electrical shock.
■ Before touching electrical parts, turn off all applicable power to
the unit.
(*) The models have a freeze prevention function that uses the heat
pump and back up heater to keep the water system safe from
freezing in all conditions. If there is an accidental or intentional
power shutdown, using glycol is recommended (Refer to 9.3
Water pipework Caution: "Use of glycol”).
2 ACCESSORIES
DANGER
WARNING
2
SHAPE
NAME
Outdoor unit installation &
owner’s manual(this book) 1
Water outlet connection pipe
assembly 2
User interface kit(digital
remote controller) 1
Tighten belt for customer
wiring use 3
1
Wire control
owner’s manual 1 1
1
1
Thermistor for domestic hot
water tank or additional
heating source*
1 1
2
3
11retlif epahs-Y
Transit line 1 1
0
9.2.3 Main control board of
hydraulic module .
Thermistor for backup heater
T1 1 0
3 SAFETY CONSIDERATIONS
The precautions listed here are divided into the following types.
They are quite important, so be sure to follow them carefully.
Meanings of DANGER, WARNING, CAUTION and NOTE symbols.
2.1 Accessories supplied with the unit
2.2 Accessories avaliable from supplier
SHAPENAME
water temperature thermistor
Transit line(for T1B)

4 BEFORE INSTALLATION
Before installation
Be sure to confirm the model name and the serial number of the unit.
■ To avoid injury, do not touch the
air inlet or aluminum fins of the unit.
■ Do not use the grips in the fan
grills to avoid damage.
■ The unit is top heavy! Prevent the
unit from falling due to improper
inclination during handling.
CAUTION
■ Ground the unit.
Grounding resistance should be according to local laws and
regulations
Do not connect the ground wire to gas or water pipes,
lightning conductors or telephone ground wires.
Incomplete grounding may cause electric shocks.
a) Gas pipes.
Fire or an explosion might occur if the gas leaks.
b) Water pipes.
Hard vinyl tubes are not effective grounds.
c) Lightning conductors or telephone ground wires.
Electrical threshold may rise abnormally if struck by a lightning bolt.
■ Install the power wire at least 3 feet (1 meter) away from
televisions or radios to prevent interference or noise. (Depending
on the radio waves, a distance of 3 feet (1 meter) may not be
sufficient to eliminate the noise.)
■ Do not wash the unit. This may cause electric shocks or fire. The
appliance must be installed in accordance with national wiring
regulations. If the supply cord is damaged, it must be replaced by
the manufacturer, its service agent or similarly qualified persons in
order to avoid a hazard.
■ Do not install the unit in the following places:
CAUTION
3
Rope
≥1000mm
Make the rope go through the
lifting holes from both the right
and left sides in the wooden
collet
the hook and barycenter of the unit
should be on a line in vertical direction
to prevent improper inclination
Handling
Due to relatively large dimensions and heavy weight, the unit should
only be handled using lifting tools with slings. The slings can be fitted
into foreseen sleeves at the base frame that are made specifically for
this purpose

5 IMPORTANT INFORMATION REGARDING
REFRIGERANT USED
This product contains fluorinated greenhouse gases covered by the
Kyoto Protocol. Do not vent gases into the atmosphere.
Refrigerant type: R410A
GWP(1) value: 2088
(1) GWP = global warming potential
The refrigerant quantity is indicated on the unit name plate
6 SELECTING THE INSTALLATION SITE
Make sure there is enough room to do the installation
WARNING
1 Select an installation site where the following conditions
are satisfied and one that meets with your customer's approval.
- Places that are well-ventilated.
- Places where the unit does not disturb next-door neighbors.
- Safe places which can bear the unit's weight and vibration
and where the unit can be installed at an even level.
- Places where there is no possibility of flammable gas or product
leak.
- The equipment is not intended for use in a potentially explosive
atmosphere.
- Places where servicing space can be well ensured.
- Places where the units' piping and wiring lengths come within the
allowable ranges.
- Places where water leaking from the unit cannot cause damage
to the location (e.g. in case of a blocked drain pipe).
- Places where rain can be avoided as much as possible.
- Do not install the unit in places often used as a work space.
In case of construction work (e.g. grinding etc.) where a lot of dust
is created, the unit must be covered.
- Do not place any objects or equipment on top of the unit (top
plate)
- Do not climb, sit or stand on top of the unit.
- Be sure that sufficient precautions are taken in case of refrigerant
leakage according to relevant local laws and regulations.
2 When installing the unit in a place exposed to strong wind, pay
special attention to the following.
Strong winds of 5 m/sec or more blowing against the unit's air
outlet causes a short circuit (suction of discharge air), and this
may have the following consequences:
- Deterioration of the operational capacity.
- Frequent frost acceleration in heating operation.
- Disruption of operation due to rise of high pressure.
- When a strong wind blows continuously on the front of the unit,
the fan can start rotating very fast until it breaks.
3 Prepare a water drainage channel around the foundation, to drain
waste water from around the unit.
4 If water does not easily drain from the unit, mount the unit on a
foundation of concrete blocks, etc. (the height of the foundation
should be about 100 mm (3.93 in).
5 If you install the unit on a frame, please install a waterproof plate
(about 100 mm) on the underside of the unit to prevent water from
coming in from the low side.
6 When installing the unit in a place frequently exposed to snow,
pay special attention to elevate the foundation as high as possible.
.
■ Set the outlet side at a right angle to the direction of the wind.
Strong wind
Strong wind
Blown air
4
5/7/9 kW
In normal condition,refer to the figures below for installation of the
unit:
The position of barycenter for different unit can be seen in the
picture below.
10-16 kW
In case of strong wind and the wind direction can be foreseen,refer
to the figures below for installation of the unit(any one is OK):
■ Turn the air outlet side toward the building's wall, fence or screen.

5
6.1 Selecting a location in cold climates
Refer to "Handling" in section “4 Before installation”
When operating the unit in cold climates, be sure to
follow the instructions described below.
■ To prevent exposure to wind, install the unit with its suction side
facing the wall.
■ Never install the unit at a site where the suction side may be
exposed directly to wind.
■ To prevent exposure to wind, install a baffle plate on the air
discharge side of the unit.
■ In heavy snowfall areas it is very important to select an installation
site where the snow will not affect the unit. If lateral snowfall is
possible, make sure that the heat exchanger coil is not affected by
the snow (if necessary construct a lateral canopy).
1 Construct a large canopy.
2 Construct a pedestal.
Install the unit high enough off the ground
to prevent it from being buried in snow.
NOTE
If drain holes in the unit are covered by a mounting base or
by floor surface, raise the unit in order to provide a free space
of more than 100 mm under the unit.
NOTE
Unit is top heavy!
Try not to install on the building frame.
NOTE
7 PRECAUTIONS ON INSTALLATION
■ Check the strength and level of the installation ground so that the
unit will not cause any operating vibration or noise after installation.
■ In accordance with the foundation drawing in the figure, fix the unit
securely by means of the foundation bolts. (Prepare four sets each of
Φ10 Expansion bolts, nuts and washers which are readily available on
the market.)
■ It is best to screw in the foundation bolts until their length is
20 mm from the foundation surface.
Concrete
basement
h≥100mm
Φ10
Expansion
bolt
Rubber
shocking
proof mat
Solid
ground
or roofing
≥100mm
≥80mm
760361
1404
Concrete
basement
h≥100mm
Φ10
Expansion
bolt
Rubber
shocking
proof mat
≥100mm
≥80mm
The drain hole is covered by
rubber plug,if one drain hole
is not enough, the big drain
hole can be opened in field.
Solid
ground
or roofing
5/7/9 kW (unit: mm)
10/12/14/16 kW (unit: mm)
drain hole
404 502
1210
6.2 Selecting a location in hot climates
As the outdoor temperature is measured via the outdoor unit air
thermistor, make sure to install the outdoor unit in the shade, or
a canopy should be constructed to avoild direct sunlight. so that
it is not influenced by the sun’s heat, otherwise protection may be
possible to the unit.
Drain hole
The drain hole is covered by
rubber plug,if one drain hole
is not enough, the big drain
hole can be opened in field.
7 If you install the unit on a building frame, please
install a waterproof plate (field supply) (about 100
mm, on the underside of the unit) in order to avoid
drain water dripping. (See the picture in the right).

6
(A) In case of stacked installation
1. In case obstacles exist in front of the outlet side.
2. In case of installing multiple units (2 units or more) in lateral
connection per row.
2. In case obstacles exist in front of the air inlet.
＜1/2 H
H
(B) In case of multiple-row installation (for roof top use, etc.)
1. In case of installing one unit per row.
＜1/2 H
H
5-9kW
Unit A(mm)
1000
1500
10-16kW
7.1 Installation servicing space
5-9kW
Unit A(mm)
2000 500 300 300
2500 1000 300 300
B1(mm) B2(mm) C(mm)
10-16kW
5-9kW
Unit A(mm)
1500 500 150
2000 1000 150
B1(mm) B2(mm)
10-16kW
C(mm)
300
300
B1
B2
B1
B2

7
Unit operation and space heating
NOTE
NOTE
8 TYPICAL APPLICATION EXAMPLES
The application examples given below are for illustration purposes only.
8.1 Application 1
Space heating only application with a room thermostat connected to the unit.
1 outdoor unit
1.1 manometer
1.2 pressure relief valve
1.3 expansion vessel
1.4 plate heat exchanger
1.5 backup heater
1.6 air purge valve
1.7 flow switch
1.8 P_i: Inside circulation pump
2 y-shape filter
3 stop valve (field supply)
4 user interface
5 room thermostat (field supply)
6 drain valve (field supply)
7 fill valve (field supply)
8 buffer tank (field supply)
9 balance tank (field supply)
9.1 air purge valve
9.2 drain valve
10 expansion vessel (field supply)
11 P_o: Outside circulation pump (field supply)
12 collector (field supply)
FHL 1…n floor heating loop
If the volume of balance tank(9) is larger than 30L, the buffer tank(8) is unnecessary, otherwise the buffer tank(8) should be installed and
the total volume of balance tank and buffer tank should larger than 30L. The drain valve (6) should be installed at the lowest positon of
the system. For 5/7/9kW unit, the backup heater (1.5) is not integrated in the outdoor unit. An independent backup heater can be selected
and installed in the door.
When a room thermostat is connected to the unit and when there is a heating request from the room thermostat, the unit will start operating
to achieve the target water flow temperature as set on the user interface. When the room temperature is above the thermostat set point in the
heating mode, the unit will stop operating. The circulation pump (1.8) and (11) will also stop running. The room thermostat is used as a switch
here.
Make sure to connect the thermostat wires to the correct terminals, method B should be selected (see "For room thermostat" in 9.6.6
connection for other components). To correctly configure the ROOM THERMOSTAT in the FOR SERVICEMAN mode see 10.7 Field
settings/ROOM THERMOSTAT.
4
5
.......
11
10
FHL1 FHL2 FHLn
12
1
32 678
9
.......

8
8.2 Application 2
Space heating only application without room thermostat connected to the unit. The temperature in each room is controlled by a valve on each water
circuit. Domestic hot water is provided through the domestic hot water tank that is connected to the unit.
■ Circulation pump operation
With no room thermostat connected to the unit (1) the circulation pump (1.8) and (11) will operate as long as the unit is on for space heating.
The circulation pump (1.8) will operate as long as the unit is on for heating domestic hot water (DHW).
■ Space heating
1) The unit (1) will operate to achieve the target water flow temperature set on the user interface.
■ Domestic water heating
1) When the domestic water heating mode is enabled (either manually by the user, or automatically through scheduling) the target domestic
hot water temperature will be achieved by a combination of the heat exchanger coil and the electrical booster heater (when the booster heater
in the tank is set to YES).
2) When the domestic hot water temperature is below the user configured set point, the 3-way valve will be activated to heat the domestic
water by means of the heat pump. If there is a huge demand for hot water or a high hot water temperature setting, the booster heater (13.1)
can provide auxiliary heating.
1 outdoor unit
1.1 manometer
1.2 pressure relief valve
1.3 expansion vessel
1.4 plate heat exchanger
1.5 backup heater
1.6 air purge valve
1.7 flow switch
1.8 P_i: circulation pump inside the unit
2 y-shape filter
3 stop valve (field supply)
4 user interface
6 drain valve (field supply)
7 fill valve (field supply)
8 buffer tank (field supply)
9 balance tank (field supply)
9.1 air purge valve
9.2 drain valve
10 expansion vessel (field supply)
11 P_o: outside circulation pump (field supply)
12 collector (field supply)
13 domestic hot water tank (field supply)
13.1 booster heater
13.2 heat exchanger coil
13.3 air purge valve
14 T5: temperature sensor
15 hot water tap (field supply)
16 P_d: DHW pump (field supply)
17 non-return valve (field supply)
18 bypass valve (field supply)
19 SV1: 3-way valve (field supply)
FHL 1...n floor heating loop
M1...n motorized valve (field supply)
T1…n room thermostat (field supply)
NOTE
If the volume of balance tank(9) is larger than 30L, the buffer tank(8) is unnecessary, otherwise the buffer tank(8) should be installed and
the total volume of balance tank and buffer tank should larger than 30L. The drain valve (6) should be installed at the lowest positon of
the system. For 5/7/9kW unit, the backup heater (1.5) is not integrated in the outdoor unit. An independent backup heater can be selected
and installed in the door.
2) When the circulation in each space heating loop (FCU1...n) is controlled by remote controlled valves (M1...n), it is important to provide a
bypass valve (18) to ensure that the flow switch safety device is not activated.
The bypass valve should be selected so that at all times the minimum water flow as mentioned in 9.3 Water pipework is guaranteed.
FHL1 FHL2 FHLn
16
14
13.1
13
17
17
15
13.2
T1 Tn
T2
11
10 12
1
4
32 678
9
18
19
13.3

9
Make sure to fit the 3-way valve correctly. For more details, refer to 9.6.6 Connection for other components/For 3-way valve SV1.
8.3 Application 3
CAUTION
The unit can be configured so that at low outdoor temperatures, water is exclusively heated by the booster heater. This assures
that the full capacity of the heat pump is available for space heating.
Details on domestic hot water tank configuration for low outdoor temperatures (T4DHWMIN) can be found in 10.7 Field settings/How to
set the DHW MODE.
NOTE
If the volume of balance tank(9) is larger than 30L, the buffer tank(8) is unnecessary, otherwise the buffer tank(8) should be installed and the total
volume of balance tank and buffer tank should larger than 30L. The drain valve(6) should be installed at the lowest positon of the system.
NOTE
Space cooling and heating application with a room thermostat suitable for heating/cooling changeover when connected to the unit. Heating is
provided through floor heating loops and fan coil units. Cooling is provided through the fan coil units only. Domestic hot water is provided
through the domestic hot water tank which is connected to the unit.
1 outdoor unit
1.1 manometer
1.2 pressure relief valve
1.3 expansion vessel
1.4 plate heat exchanger
1.5 backup heater
1.6 air purge valve
1.7 flow switch
1.8 P_i: circulation pump inside the unit
2 y-shape filter
3 stop valve (field supply)
4 user interface
5 room thermostat (field supply)
6 drain valve (field supply)
7 fill valve (field supply)
8 buffer tank (field supply)
9 balance tank (field supply)
9.1 air purge valve
9.2 drain valve
10 expansion vessel (field supply)
11 P_o: outside circulate pump (field supply)
12 collector (field supply)
13 domestic hot water tank (field supply)
13.1 booster heater
13.2 heat exchanger coil
13.3 air purge valve
14 T5:temperature sensor
15 hot water tap (field supply)
16 P_d: DHW pipe pump (field supply)
17 non-return valve (field supply)
19 SV1: 3-way valve (field supply)
20 SV2: 2-way valve (field supply)
FHL 1...n floor heating loop
FCU 1...n fan coil units
FHL1 FHL2 FHLn
FCUnFCU2FCU1
11
10
12
1
32 678
9
16
14
13.1
13
17
17
15
13.2
12
20
4
19
5
13.3

■ Domestic water heating
10
8.4 Application 4
The ON/OFF setting of the heating/cooling operation cannot be done on the user interface.
Domestic water heating is as described in 8.2 Application 2.
■Pump operation and space heating and cooling
According to the season, the unit will switch to either heating or cooling mode according to the temperature detected by the room thermostat.
When space heating/cooling is requested by the room thermostat (5), the pump will start operating and the unit (1) will switch to heating mode/cooling
mode. The unit (1) will operating to achieve the target cold/hot water leaving temperature.
In the cooling mode. the motorized 2-way valve (20) will close to prevent cold water running through the floor heating loops (FHL).
CAUTION
■ Make sure to connect the thermostat wires are routed to the correct terminals and to configure the ROOM THERMOSTAT in the user interface
correctly (see 10.7 Field settings/ROOM THERMOSTAT). Wiring of the room thermostat should follow method A as described in 9.6.6
connection for other components/For room thermostat.
■ Wiring of the 2-way valve (20) is different for a NC (normal closed) valve and a NO (normal open) valve! Make sure to connect to the
correct terminal numbers as detailed on the wiring diagram.
Space cooling and heating application without a room thermostat connected to the unit , but with heating/cooling thermostat controlling the fan
coil units. Heating is provided through floor heating loops and fan coil units. Cooling is provided through the fan coil units only.
1 outdoor unit
1.1 manometer
1.2 pressure relief valve
1.3 expansion vessel
1.4 plate heat exchanger
1.5 backup heater
1.6 air purge valve
1.7 flow switch
1.8 P_i: circulation pump in the unit
2 y-shape filter
3 stop valve (field supply)
4 user interface
6 drain valve (field supply)
7 fill valve (field supply)
8 buffer tank (field supply)
9 balance tank (field supply)
9.1 air purge valve
9.2 drain valve
10 expansion vessel (field supply)
11 P_o: outside circulate pump (field supply)
12 collector (field supply)
18 bypass valve (field supply)
20 SV2: 2-way valve (field supply)
FHL 1...n floor heating loop
FCU 1...n fan coil units
M1...n motorized valve (field supply)
T1…n room thermostat (field supply)
FHL1 FHL2 FHLn
FCUnFCU2FCU1
T2 TnT1
11
10
12
1
9.1
32 6789.2
9
12
4
18
20
3

11
Pump operation
With no room thermostat connected to the unit (1), the circulation pump (1.8) and (11) will operate as long as the unit is on for space heating.
The pump (1.8) will operate as long as the unit is on for heating domestic hot water.
Space heating and cooling
According to the season, the customer selects cooling or heating through the user interface. The unit (1) will operate in cooling mode or heating
mode to achieve the target water flow temperature. In heating mode, the 2-way valve (20) is open. Hot water is provided to both the fan coil units
and the floor heating loops. In cooling mode, the motorized 2-way valve (20) is closed to prevent cold water running through the floor heating loops
(FHL).
The ON/OFF setting of the heating/cooling operation is done by the user interface.
NOTE
Details on pump configuration can be found in 10.5 setting the pump speed.
NOTE
CAUTION
When closing several loops in the system by remotely controlled valves, it might be required to install a bypass valve (18) to avoid the
flow switch safety device from being activated. See also 8.2 Application 2.
Wiring of the 2-way valve (20) is different for a NC (normal closed) valve and a NO (normal open) valve. The NO valve is unavailable
to this unit. Make sure to connect to the correct terminal numbers as detailed on the wiring diagram.
8.5 Application 5
Space heating with an auxiliary boiler (alternating operation).
Space heating application by either the unit or by an auxiliary boiler connected in the system.
■ The unit controlled contact (also called 'permission signal for the auxiliary boiler") is determined by the outdoor temperature (thermistor
located at the outdoor unit). See 10.7 Field settings/OTHER HEATING SOURCE
■ Bivalent operation is possible for both space heating operation and domestic water heating operation.
■ If the auxiliary boiler only provides heat for space heating, the boiler must be integrated in the piping work and in the field wiring according to
the illustration for application a.
■ If the auxiliary boiler is also providing heat for domestic hot water, the boiler can be integrated in the piping work and in the field wiring
according to the illustration for application b.
■ Application c can be used If the temperature of water from the outdoor unit is not high enough. An additional 3-way valve should be
installed, if ambient temperature is high and thus water from outdoor unit is high enough, The boiler will not work and water will not flow past
the boiler. When ambient temperature is low and and thus water from outdoor unit is not high enough, the boiler will work and the 3-way valve
will open to make water from outdoor unit flow past the boiler and be heated again.
CAUTION
Be sure that the boiler and the integration of the boiler in the system is in accordance with relevant local laws and regulations.
If the volume of balance tank(9) is larger than 30L, the buffer tank(8) is unnecessary, otherwise the buffer tank(8) should be installed and the
total volume of balance tank and buffer tank should larger than 30L.The drain valve (6) should be installed at the lowest positon of the system.
For 5/7/9kW unit, the backup heater (1.5) is not integrated in the outdoor unit. An independent backup heater can be selected and installed in the
door.

Application a
Boiler provide heat for space heating only
12
Application b
Boiler provide heat for space heating and domestic water heating.
FHL1 FHL2 FHLn
12
AHS
4
11
10
1
32 678
9
16
14
13.1
13
17
17
15
13.2 17
23
19
24
13.3
17
FHL1 FHL2 FHLn
AHS
23
.......
11
10
12
1
32 678
9
4
16
14
13.1
13
17
17
15
13.2
17
19 24.1
24
13.3
17

Application c
13
Boiler provide heat for space heating and domestic water heating, but the boiler and outdoor unit are connect in series.
If application c is selected, the control cable connect to the boiler should also connect to the 3-way valve (25), that is to say the 3-way valve(25)
and boiler should work simultaneously.
FHL1 FHL2 FHLn
AHS
.......
11
10
12
1
32 6 7
8
9
16
14
13.1
13
17
17
15
13.2
25
17
23 19
4
24.1
24
13.3
1 outdoor unit
1.1 manometer
1.2 pressure relief valve
1.3 expansion vessel
1.4 plate heat exchanger
1.5 backup heater
1.6 air purge valve
1.7 flow switch
1.8 P_i: circulation pump inside
the unit
2 y-shape filter
3 stop valve (field supply)
4 user interface
6 drain valve(field supply)
7 fill valve(field supply)
8 buffer tank(field supply)
9 balance tank(field supply)
9.1 air purge valve
9.2 drain valve
10 expansion vessel(field supply)
11 P_o: outside circulation pump
(field supply)
12 collector(field supply)
13 domestic hot water tank(field
supply)
13.1 booster heater
13.2 heat exchanger coil
13.3 air purge valve
14 T5:temperature sensor
15 hot water tap(field supply)
16 P_d: DHW pump(field supply)
17 non-return valve(field supply)
19 SV1: 3-way valve(field supply)
23 T1B: temperature sensor(field
supply)
24 mixing station(field supply)
24.1 P_c: mixing pump
25 3-way valve(field supply)
FHL 1...n floor heating loop
AHS additional heating
source(boiler)
NOTE
If the volume of balance tank(9) is larger than 30L, the buffer tank(8) is unnecessary, otherwise the buffer tank(8) should be installed and the
total volume of balance tank and buffer tank should larger than 30L.. The drain valve (6) should be installed at the lowest positon of the system.
For the 5/7/9kW unit, the backup heater (1.5) is not integrated in the outdoor unit. An independent backup heater can be selected and installed
in the door.Temperature sensor T1B must be installed at the outlet of AHS, and connect to the corresponding port in the main control board of
hydraulic module(refer to 9.2.3 Main control board of hydraulic module).
Operation
When heating is required, either the unit or the boiler starts operating, depending on the outdoor temperature (refer to 10.7 field setting/OTHER
HEATING SOURCE).
■ As the outdoor temperature is measured via the outdoor unit air thermistor, make sure to install the outdoor unit in the shade, so that it is not i
influenced by the sun’s heat.
■ Frequent switching can cause corrosion of the boiler at an early stage. Contact the boiler manufacturer.
■ During heating operation of the unit, the unit will operate to achieve the target water flow temperature set on the user interface. When weather
dependent operation is active, the water temperature is determined automatically depending on the outdoor temperature.

14
CAUTION
■ Ensure that return water to the heat exchanger does not exceed 60°C. Never put the target water flow temperature set point on the
user interface above 60°C.
■ Make sure that the non-return valves (field supply) are correctly installed in the system.
■ The supplier will not be held liable for any damage resulting from failure to observe this rule.
■ During heating operation of the boiler, the boiler will operate to achieve the target water flow temperature set on the user interface.
■ Never set the target water flow temperature set point on the user interface above (60°C).
Make sure to correctly configure FOR SERVICEMAN in the user interface. Refer to 10.7 Field settings/Other heating source.
NOTE
8.6 Application
■ Space heating with two room thermostat application through floor heating loops and fan coil units. The floor heating loops and fan coil units
require different operating water temperatures.
■ The floor heating loops require a lower water temperature in heating mode compared to fan coil units. To achieve these two set points, a
mixing station is used to adapt the water temperature according to requirements of the floor heating loops. The fan coil units are directly
connected to the unit water circuit and the floor heating loops are after the mixing station. Control of this mixing station is not done by the unit.
■ The operation and configuration of the field water circuit is the responsibility of the installer.
■ We only offer a dual set point control function. This function allows two set points to be generated. Depending on the required water
temperature (floor heating loops and/or fan coil units are required) the first set point or second set point can be activated. See 10.7 field setting
/ROOM THERMOSTAT.
NOTE
The wiring of room thermostat 5A(for fan coil units) and 5B(for floor eating loops) should follow 'method C' as described in 9.6.6
Connection for other components/For room thermostat, and the thermostat which connect to port 'C' (in the outdoor unit) should be
placed on the zone where floor heating loops is installed(zone B), the other one connect to port 'H' should be placed on the zone
where fan coil units is installed(zone A).
FHL1 FHL2 FHLn
FCUnFCU2FCU1
T2 TnT1
25
T
25
T
11
10
12
1
32 67 8
9
20
18
4
5B
5A
12
24.1
24

15
When the room temperature of both zones is above the thermostat set point, the outdoor unit and pump will stop operating.
The advantage of the dual set point control is that the heat pump will/can operate at the lowest required water flow temperature when only
floor heating is required. Higher water flow temperatures are only required in case fan coil units are operating. This results in better heat pump
performance.
Pump operation and space heating
The pump (1.8) and (11 will operate when there is a request for heating from A and/or B. The outdoor unit will start operating to achieve the
target water flow temperature. The target water leaving temperature depends on which room thermostat is requesting heating.
NOTE
1 outdoor unit
1.1 manometer
1.2 pressure relif valve
1.3 expansion vessel
1.4 plate heat exchanger
1.5 backup heater
1.6 air purge valve
1.7 flow switch
1.8 P_i: circulation pump in the unit
2 y-shape filter
3 stop valve (field supply)
4 user interface
6 drain valve (field supply)
7 fill valve (field supply)
8 buffer tank (field supply)
9 balance tank (field supply)
9.1 air purge valve
9.2 drain valve
10 expansion vessel (field supply)
11 P_o: outside circulation pump (field supply)
12 collector (field supply)
18 bypass valve (field supply)
20 SV2:2-way valve (field supply)
24 mixing station (field supply)
24.1 P_c: mixing pump
FHL 1...n floor heating loop
FCU 1...n fan coil units
M1...n motorized valve (field supply)
T1…n room thermostat (field supply)
NOTE
If the volume of balance tank(9) is larger than 30L, the buffer tank(8) is unnecessary, otherwise the buffer tank(8) should be installed and the
total volume of balance tank and buffer tank should larger than 30L.The drain valve (6) should be installed at the lowest positon of the system.
For the 5/7/9kW unit, the backup heater (1.5) is not integrated in the outdoor unit. An independent backup heater can be selected and installed
in the door.
■ Make sure to correctly configure the room thermostat installation on the user interface. Refer to "10.7 Field settings/ROOM
THERMOSTAT".
■ It is the installers’ responsibility to ensure that no unwanted situations can occur (e.g. extremely high temperature water going towards floor
heating loops, etc.)
■ The supplier does not offer any type of mixing station. Dual set point control only provides the possibility to use two set points.
■ When only zone A requests heating, zone B will be fed with water at a temperature equal to the first set point. This can lead to unwanted
heating in zone B.
■ When only zone B requests heating, the mixing station will be fed with water at a temperature equal to the second set point.Depending on
the control of the mixing station, the floor heating loop can still receive water at a temperature equal to the set point of the mixing station.
■ Be aware that the actual water temperature through the floor heating loops depends on the control and setting of the mixing station.

16
18
FHL1 FHL2 FHLn
FCUnFCU2FCU1
T2 TnT1
11
10
12
1
32 678
9
12
4
26
If the volume of balance tank(9) is larger than 30L, the buffer tank(8) is unnecessary, otherwise the buffer tank(8)
should be installed and the total volume of balance tank and buffer tank should larger than 30L.The drain valve (6)
should be installed at the lowest position of the system. For the 5/7/9kW unit. The backup heater (1.5) is not integrated
in the outdoor unit. An independent backup heater can be selected and installed in the door. The wiring of the 3-way
valve (26) should follow the wiring of 2-way valve SV2 (refer to 9.6.6 Connection for other components/ For 2-way
valve SV2).
8.7 Application 7
Space cooling and heating application without a room thermostat connected to the unit, but the temperature sensor attached in the user
interface is used to control the ON/OFF of the unit. Heating is provided through floor heating loops. Cooling is provided through the fan coil
units. A 3-way valve is used to change the direction of water flow when the operation mode changed.
1 outdoor unit
1.1 manometer
1.2 pressure relif valve
1.3 expansion vessel
1.4 plate heat exchanger
1.5 backup heater
1.6 air purge valve
1.7 flow switch
1.8 P_i: circulate pump in the unit
2 y-shape filter
3 stop valve(field supply)
4 user interface
6 drain valve(field supply)
7 fill valve(field supply)
8 buffer tank(field supply)
9 balance tank(field supply)
9.1 air purge valve
9.2 drain valve
10 expansion vessel(field supply)
11 P_o:outside circulate
pump(field supply)
12 collector(field supply)
18 bypass valve(field supply)
26 3-way valve(field supply)
FHL 1...n floor heating loop
FCU 1...n fan coil units
M1...n motorized valve (field supply)
T1…n room thermostat (field supply)
NOTE
B
inlet A
In normal condition, port A should be opened, while signal sent to the 3-way valve (26), port A will be closed and port B will be opened.
When in cool mode, ON signal will sent from outdoor unit to the 3-way valve (26), the cold water will flow through port inlet to port B, and
port B should connect to the fan coil units. While in heating mode, the hot water will flow through port inlet to port A, and port A should
connect to the floor heating loops. In this way, all the water from the unit will flow through the floor heating loops and thus ensure better
performance of the floor heating.
As the temperature sensor is used to detect the room temperature, the user interface (4) should be placed in the room where floor
heating loops and fan coil units is installed and away from the heating source. Correct configuration should be applied in the user
interface (refer to 10.7 field settings/TEMP. TYPE SETTING). The target room temperature can be set on the main page of user
interface, the target outlet water temperature will be calculated from climate related curves, the unit will turn off when the room
temperature reaches the target temperature.

17
1 outdoor unit
1.1 manometer
1.2 pressure relif valve
1.3 expansion vessel
1.4 plate heat exchanger
1.5 backup heater
1.6 air purge valve
1.7 flow switch
1.8 P_i: circulate pump in the unit
2 y-shape filter
3 stop valve(field supply)
4 user interface
6 drain valve(field supply)
7 fill valve(field supply)
8 buffer tank(field supply)
9 balance tank(field supply)
9.1 air purge valve
9.2 drain valve
10 expansion vessel(field supply)
11 P_o: outside circulate pump(field supply)
12 collector(field supply)
13 domestic hot water tank(optional)
13.1 booster heater
13.2 heat exchanger coil
13.3 air purge valve
14 T5:temperature sensor
15 hot water tap(field supply)
16 P_d: DHW pump(field supply)
17 non-return valve(field supply)
18 bypass valve(field supply)
19 SV1: 3-way valve(field supply)
FHL 1...n floor heating loop
27 Solar energy kit(field supply)
28 P_s: Solar pump(field supply)
The pump (1.8) and (11 will operate when there is a request for heating floor heating loops. The outdoor unit will start operating to achieve the
target water flow temperature. The target water can be set in the user interface.
if solar energy is set avaliable in the user interface(refer to 10.7 Field settings/OTHER HEATING SOURCE ), the heating of domestic hot water
can be done by either the solar energy kit or heat pump. when the solar energy kit turns on, signal will sent to the outdoor unit, then the pump
(28) will operate, the heat pump will stop heating for domestic hot water during solar energy kit operation .
Make sure to wiring the solar energy kit(27) and solar pump(28) correctly, refer to “9.6.6 Connection for other components/For solar energy
kit”. User interface should be correctly configured, refer to “10.7 Field settings/OTHER HEATING SOURCE”.
NOTE
NOTE
If the volume of balance tank(9) is larger than 30L, the buffer tank(8) is unnecessary, otherwise the buffer tank(8) should be installed and the total
volume of balance tank and buffer tank should larger than 30L.The drain valve (6) should be installed at the lowest positon of the system. For
the 5/7/9kW unit, the backup heater (1.5) is not integrated in the outdoor unit. An independent backup heater can be selected and installed in the door.
1
32
8.8 Application 8
Space heating application and domestic hot water heating with a solar energy kit connect to the system, space heating is provided by heat
pump, domestic hot water heating is provided by heat pump and solar energy kit.
13.3
13.3
FHL1 FHL2 FHLn
16
14
13.1
13
17
17
15
13.2
11
10 12
4
678
9
18
19
SP
27 28

9 OVERVIEW OF THE UNIT
9.1 Opening the unit
Door 1 gives access to the compressor compartment and electrical
parts.
Door 2 gives access to the hydraulic compartment and electrical
parts.
Push the grill to the left until it stops. then pull its right edge, the grill
can now be removed. You can also reverse the procedure. Exercise
caution to avoid a possible hand injury.
Parts inside the unit may be hot.
CAUTION
WARNING
Switch off all power — i.e. unit power supply and backup heater
and domestic hot water tank power supply (if applicable) —
before removing doors 1 and 2.
9.2 Main components
9.2.1 Hydraulic compartment
1.Air purge valve
Remaining air in the water circuit will be automatically removed via
the air purge valve.
2.Backup heater
The backup heater consists of an electrical heating element that
will provide additional heating capacity to the water circuit if the heating
1-phase 10~16kW
3-phase 12~16kW
capacity of the unit is insufficient due to low outdoor temperatures.
It also protects the external water piping from freezing.
3.Expansion vessel (1.32 gallons (5 L))
4.Pressure Sensor
5.Refrigerant gas connection
6.Temperature sensors
Four temperature sensors determine the water and refrigerant
temperature at various points in the water circuit.
6.1-T2B; 6.2-T2; 6.3-T1; 6.4-TW_out; 6.5-TW_in
7.Refrigerant liquid connection
8.Manometer
The manometer provides a water pressure readout of the water
circuit
18
1 2
1
2
3
4
5
6.1
6.5
7
8
9
6.3
10
6.4
11
12
13
14
15.3
15.1
15.2
12.1
14.1
6.2
T1
T2
T2B
TW_in
TW_out