Mareli Systems FGS10MB User manual

DC INVERTER Heat Pump
Mareli Systems
Attention
Thank you for choosing our product, we shall be more than glad to service you. For you to better operate
this product and to prevent accidents due to misuse, please read carefully this user manual before carrying
out any installation or operation, also please pay special attention to the warning, prohibition and atten-
tion instructions. We are continuously supplementing and upgrading this user manual to better service
for you!
Installation Manual&User
Air to Water Heat Pump
FGS10MB / FGS20MB

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Mareli Systems
CONTENTS
Installation Manual
Part 1. Before use 2
1. Atentions 4
2. Installation 4
3. R32 refrigerant introduction 4
4. Heat pump installation and wiring 9
User Manual
Part 2. User interface 21
• Buttons function 21
• Main mask 21
• User menu 23
Part 3.Maintenance and repairing 27
• Error code and repairing 27
• Other problem and repairing 30
Part 1. Before Use
is appliance is not intended for use by persons, including
children, with reduced physical, sensory or mental capabil-
ities, or lack of experience and knowledge, unless they have
been given supervision or instruction concerning use of the
appliance by a person responsible for their safety. Children
should be supervised to ensure that they do not play with the
appliance.
Be sure to read this manual before use.
Be sure to read this manual before use. e installation,
dismantle, maintenance of the unit must be performed by
qualied personnel. It is forbidden to do any changes to the
structure of the unit. Otherwise injury of person or unit
damage might happen.
e power supply to the unit must be grounded.

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Make sure the power supply to the heat pump unit is o
before any operations are done on the unit.
When the power cord gets loose or is damaged, always get a
qualied person to x it.
Keep the unit away from the combustible or corrosive
environment.
Use a dedicated circuit for this unit, otherwise malfunction
may occur. Do not touch the air outlet grill when fan is running.
Water or any kind of liquid is strictly forbidden to be poured
into the product, or may case creepage or breakdown of the
product.
When running the unit, never cover with cloth or any other
material that blocks ventilation on the product which will lead
to low eciency or even non-operation of this unit.
When the power cord gets loose or is damaged, always get a
qualied person to x it.
It is mandatory to use a suitable circuit breaker for the
heat pump and make sure the power supply to the heater
corresponds to the specications. Otherwise the unit might
be damaged.
Warning Caution Prohibited

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Safety precaution
2. Installation instructions
1. Installation should comply with local regulations and requirements.
2. Choose a suitable place for use (please refer to indoor/outdoor unit location selection). e cooling
capacity/heating capacity of the heat pump should match with the size, height, and heat insulation of
the room.
3. Before installation, check the correspondence of neutral line, ground line, A phase, B phase, C phase of
the user power supply as well as the lines of the heat pump.
4. is heat pump complies with the safety and operation standards issued by the country.
5. When the heat pump needs to be installed or moved this must be done by professional refrigeration
installation and maintenance personnel. Heat pumps installed by non-professionals are prone to quality
or safety problems.
6. e user should provide a power supply that satises the installation and use. e allowable range of
voltage that can be used by this product is ±10% of the rated value. If this range is exceeded, it will aect
the normal operation of the heat pump. If necessary, use a voltage stabilizer to avoid property damage.
7. e heat pump must have an independent power supply circuit. e independent circuit should be
equipped with leakage proration and an automatic circuit breaker provided by the user.
8. e heat pump should be installed in accordance with the national wiring regulations.
9. e heat pump must be grounded correctly and reliably, otherwise it may cause electric shock or re.
10. Please do not turn on the power of the heat pump until the piping and wires are connected and checked
3. R32 refrigerant introduction
e heat pump uses environmentally friendly R32 refrigerant. is is a slightly ammable refrigerant. Al-
though it can burn and explode under certain conditions, as long as it is installed in a room of the correct area
and used correctly, there will be no danger of combustion and explosion. Compared with other refrigerants,
R32 is an environment-friendly refrigerant that does not damage the ozone layer, and has low global warming
potential.
R32 HEAT PUMP ROOM AREA REQUIREMENTS FOR SPLIT TYPE HEAT PUMPS
e area of the heat pump installation, operation and storage room should be larger than 4 square meters.
DO NOT INSTALL MONOBLOCK TYPE HEAT PUMPS IN CLOSED ROOMS.
Warning
1. Please read this manual before installation, operation and maintenance.
2. Except as specically recommended by the manufacturer, please do not use any method to speed up the
defrosting process or clean the frosted part.
3. Please do not damage the body of the heat pump and do not expose to ignition.
4. e heat pump should be stored in a room without any re sources (such as gas appliances ignited by an
open ame, electric heaters, etc.).
5. When repairs are required, please contact the nearest aer-sales service centre. When repairing, you
must strictly abide by the operation manual provided by the manufacturer. Repair by non-professionals
is forbidden.
6. Please comply with the relevant national gas laws and regulations.
7. e refrigerant in the system needs to be recovered and removed during maintenance or disposal.
Read the manual
before use

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Repair of sealing elements
1. When repairing closed components, disconnect the power supply to the equipment before opening the
sealed cover. If power supply is necessary during the maintenance process, continuous leak detection
should be performed at the most critical points to avoid potentially dangerous situations.
2. In the following maintenance of electrical components, special care should be taken not to aect the
protection level of the enclosure. Improper maintenance methods may cause: damage to cables, excessive
connections, terminals not installed according to the original regulations, damage to the seal, incorrect
installation of the sealing cover and other dangers. Ensure that the installation of the equipment is safe
and reliable. Ensure that the sealing or sealing material will not lose its function of preventing the entry
of ammable gas due to aging. Replacement parts should meet the manufacturer's specications.
Note: e use of silicon-containing sealants may reduce the detection capabilities of leak detection equip-
ment. Intrinsically safe components do not need to be isolated before operation.
Maintenance of intrinsically safe components
If it is not possible to ensure that the heat pump does not exceed the allowable voltage and current limits during
use, do not use any permanent inductive or capacitive load in the circuit.
Intrinsically safe components are the only components that can continue to work in ammable gases.
Replacement of components should be only done with the parts specied by the manufacturer, other parts
may cause refrigerant leak and re risk.
Cable
Check whether the cable will be aected by wear, corrosion, overpressure, vibration, sharp edges or other
adverse environments. e inspection should also consider the inuence of aging or continuous vibration of
the compressor and fan on the cable.
Leak inspection of R32 refrigerant
Check for refrigerant leakage should be done in an environment where there is no potential ignition source.
Halogen probes (or any other detectors that use open ames) should not be used for detection.
Leak detection method
For systems containing R32 refrigerant, an electronic leak detector can be used for testing. e test should be
calibrated in a refrigerant-free environment. Ensure that the leak detector does not become a potential source
of ignition and is suitable for the refrigerant being tested. e leak detector should be set to the lowest am-
mable concentration of the refrigerant (expressed as a percentage), calibrated with the refrigerant used and
adjusted to the appropriate gas concentration test range (up to 25%).
e uid used to detect leaks is suitable for most refrigerants, but do not use chlorine-containing solvents to
prevent chlorine and refrigerants from reacting and corroding copper pipes.
If a leak is suspected, remove any ignition source from the appliance area.
If welding is required at the location where the leakage occurs, all refrigerants should be recovered, or all re-
frigerants should be isolated away from the leakage point (use shut-o valves). Oxygen-free nitrogen (OFN) is
used to purify the entire system before and during welding.

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Remove refrigerant and vacuum
Maintenance or other operations on the refrigeration circuit should be performed in accordance with normal
procedures. Safety should also be considered and the procedure should be followed:
1. Remove refrigerant;
2. Purify the pipeline with inert gas;
3. Vacuum;
4. Purify the pipeline with inert gas again;
5. Cut and replace the pipe or weld it.
e refrigerant should be recovered into a suitable cylinder. e system should be purged with oxygen-free
nitrogen. is process may need to be repeated several times. Do not use compressed air or oxygen for this
operation.
Procedure before pipe welding:
Procedure of charging refrigerant
As a supplement for the conventional procedures, the following requirements have been added:
1. When using refrigerant charging equipment, avoid mutual contamination between dierent refriger-
ants. e pipeline of refrigerant lling should be as short as possible to reduce the residual amount of
refrigerant;
2. When lling refrigerant, remove all re sources near the unit;
3. Make sure that the refrigerant system is grounded before charging the refrigerant;
4. Aer charging refrigerant, stick label on the system;
5. Avoid excessive charge;
Perform a pressure test with oxygen-free nitrogen before charging refrigerant into the system. Aer charging,
a leak test should be performed before the operation. e leak test should be performed again when leaving
the area.
Scrapping
Before proceeding with this procedure, the technician should be aware of the equipment and all of its char-
acteristics. It is mandatory to recover the refrigerant safe. If it is necessary to re-use the recovered refrigerant,
samples of refrigerant and oil should be analyzed.
1. Before proceeding be aware of the equipment and its operation;
2. Disconnect the power supply;
3. Before proceeding with this procedure make sure that:
If necessary, the equipment of mechanical operation should be convenient to operate the refrigerant storage tank;
All personal protective equipment is available, eective and is used correctly;
e entire recycling process should be done under the guidance of qualied persons; Recycling equipment and
refrigerant storage tanks should meet the corresponding standards.
Maintenance safety
Warning
1. For repairs or scrapping, please contact the nearest or authorized service centre.
2. Repairs performed by unqualied personnel may be dangerous.
3. When charging the heat pump with R32 refrigerant and maintaining it, please strictly observe the manu-
facturer's requirements. is chapter mainly focuses on the special maintenance requirements of R32 re-
frigeration appliances. Please refer to the aer-sales service manual for detailed maintenance operations.
In the purging process, the system is lled with oxygen-free nitrogen to reach the working pressure under the
vacuum state of the system, and then the oxygen-free nitrogen is discharged, and nally the system is evacu-
ated. Repeat this process until all refrigerant in the system is removed. Aer lling the oxygen-free nitrogen
for the last time, exhaust the gas to atmospheric pressure, and then the system is ready for welding. e above
operations are necessary for pipeline welding operations.
Ensure that there is no ignition source near the outlet of the vacuum pump. Ensure good ventilation of the area.

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Qualication requirements for maintenance personnel
1. All operating personnel or refrigeration circuit maintenance personnel should obtain a valid certicate
issued by an evaluation body to determine that they have the qualications for safe handling of refrig-
erants as required.
2. e maintenance and repair of the equipment can only be carried out in accordance with the method
recommended by the equipment manufacturer. If other professionals are required to assist in maintain-
ing and repairing the equipment, it should be carried out under the supervision of personnel qualied
to use ammable refrigerants.
Site inspection
Before repairing heat pumps using R32 refrigerant, safety inspections must be carried out to ensure that the
risk of re is minimized. When servicing the refrigeration system, the following precautions should be ob-
served before handling the system.
Operational procedure
Ensure that the risk from leakage of combustible gases or vapours is minimal during operations.
General operating area
All maintenance personnel and other personnel in the operation area should be aware of the character of the
operation being performed. Avoid working in conned spaces. Work areas should be properly isolated to
ensure safe working conditions without any combustible materials.
Check the presence of refrigerant
Refrigerant monitors should be used in the area before and during operations to ensure that technicians are
aware of the presence of potentially combustible gases. Ensure that the leak detection equipment is suitable for
R32 refrigerant, sparkles, fully sealed and intrinsically safe.
Fire extinguishers must be available in the room.
e applicable re extinguisher should be located close to the cooling system or related components during
hot working operations. e refrigerant injection area should be equipped with dry powder or carbon dioxide
re extinguisher.
No re
Any re sources should not be used when performing work related to exposed pipes containing R32 re-
frigerant. is may cause a re or explosion hazard. All sources of re, must be kept away from the area of
installation, repair, removal and disposal of combustible refrigerants that may be released into the surrounding
environment. Before starting operations, check the environment around the equipment to ensure that there is
no danger of ammability or re. ere should be a "no smoking" sign.
Ventilated area
Ensure that the work area is open or fully ventilated before opening the system or performing thermal pro-
cessing operations. Keep ventilation during operation. Ventilation will safely remove the leaked refrigerant.
Inspection of refrigeration equipment
If the electrical components are replaced, these should be installed in accordance with the purpose of use and
correct operation regulations. Follow the manufacturer's maintenance and repair guidelines. If you have any
questions, please consult the manufacturer's technical department. For installations using R32 refrigerant, the
following inspection items apply:

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1. e lling amount should be determined according to the marked amount on the heat pump’s rating plate.
2. e ventilation equipment should operate normally, and the vents should be unobstructed.
3. If an indirect refrigeration cycle is used, please check whether there is refrigerant in the secondary circuit.
4. e logo or marking on the heat pump should be clearly visible, and the ambiguous signs and symbols
should be corrected;
5. Refrigeration piping or electrical components should not be installed in corrosive environment.
• To avoid electrical shock, make sure to disconnect power supply 1 minute or more before operating.
Even aer 1minute, always measure the voltage at the terminals of main circuit capacitors or electrical
parts. Make sure that voltages are lower than the safety limits.
• Power supply wire line must be sized according to this manual and must be grounded.
• Don’t put in hands to air outlet grill when fan is working.
• Don’t touch wire lines with wet hand, and don’t pull any wire lines of the unit.
• Water or any other kind liquid is forbidden to be poured onto the unit.
• Select correct circuit breaker and leakage protection switch.
• Don’t touch the ns of source side heat exchanger, it may injure your hand.
• If any wire line is loose or damaged, contact qualied person to x the problem.
AIRWATER HEAT PUMP
1. Y-shape lter must be installed in front of water pump.
2. Required water ow – 0.18 m3/h foe every 1kW capacity.
3. Power of the water pump must be matched to the resistance of installation components.
4. DHW utilize national standards urban tap water.
5. Install the temperature sensor on the water tank. Direct contact with water is not allowed.
6. When ambient temperature drops below 0°C, drain the water to prevent freezing (no need to drain
systems with glycol).
7. A 40-70 mesh lter needs to be added before the inlet for the heat pump, and the water ion concen-
tration needs to be less than 280 ppm.
8. Do not connect backup heater power supply directly to the heat pump. Install power contractor for
the backup heater.
9. e installation must comply with above terms and conditions. If there are any deviations, the man-
ufacturer is not responsible for the potential safety risks.

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Important parts in heat pump
4.Heat pump installation and wiring
No.
Component
No.
Component
1
Air fan
16
Plate heat exchanger (condenser)
2
Air outlet panel
17
Four way valve
3
Fan motor
18
Electric box cover plate
4
Side wire mesh
19
Fan motor controller
5
Fan support
20
Controller
6
Middle panel
21
Water pump
7
Cover
22
Suction accumulator
8
Evaporator
23
Compressor
9
Compressor inverter
24
Chassis
10
Water flow switch
25
Automatic air vent
11
Rear wire mesh
26
Electronic expansion valve
12
Rear service panel
27
Filter dryer
13
Pressure gauges
28
Plate heat exchanger (economizer)
14
Right side panel
29
Front service panel
15
Controller box
30
Water flow reversing valve
FGS10MB
11
7
30
12
8
19
4
3
1
2
9
21 10
25
15
20
18
29
14
13
16
27
28
26
22
17
23
6
5
24

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FGS20MB
No.
Component
No.
Component
1
Air fan
16
Plate heat exchanger (condenser)
2
Air outlet panel
17
Four way valve
3
Fan motor
18
Electric box cover plate
4
Side wire mesh
19
Fan motor controller
5
Fan support
20
Controller
6
Middle panel
21
Water pump
7
Cover
22
Suction accumulator
8
Evaporator
23
Compressor
9
Compressor inverter
24
Chassis
10
Water flow switch
25
Automatic air vent
11
Rear wire mesh
26
Electronic expansion valve
12
Rear service panel
27
Filter dryer
13
Pressure gauges
28
Plate heat exchanger (economizer)
14
Right side panel
29
Front service panel
15
Controller box
30
Water flow reversing valve
7
12
4
8
319
911
25
30
20 18
15
13
14
29
10
21
16
27
22
28
26
17
23
6
5
24
1
2

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FGS20MB
FGS10MB
HEAT PUMP SIZE
908.00
1165.10
180.50
263.25
593.25
794.00
463.00 433.00 391.20
1408.00
1152.00
1150.00
612.00 370.00
170.00
514.00 451.20 484.00
810.00

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Heat pump
Controlling center
Room thermostat 3
Room thermostat 4
Floor heating 1 Floor heating 2
Room thermostat 2
Room thermostat 1
P2
OFF
C
C
OFF
C
C
OFF
C
C
OFF
C
C
fan coil 1 fan coil 2
water tank
Heat pump controller
3-way valve
2-way valve
Ball valve
Non-return valve
Filter
Water pump
Temp sensor
Release valve
Expansion tank
Notice:
1. Select the right modes according to
your demand and install it according to
the installation diagram. If only hot water
function required, select heating+hot water
mode, and attach the hot water sensor to
the hot water tank.
2. Fan coil can be controlled by linkage
with the secondary circulation pump . Pas-
sive linkage thermostat shall be installed.
3. is is primary circulation system. When
the control of the temperature by dierent
zones is not needed, use this system.

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Notice:
1. Select the right modes according to
your demand and install it according to
the installation diagram. If only hot water
function required, select heating+hot water
mode, and attach the hot water sensor to
the hot water tank.
2. Two-way valve and BV valve are option-
al for installation. When the control of the
temperature by dierent zones is not need-
ed, install both.
3. Fan coil can be controlled by linkage
with the secondary circulation pump . Pas-
sive linkage thermostat shall be installed.
3-way valve
2-way valve
Ball valve
Non-return valve
Filter
Water pump
Temp sensor
Release valve
Expansion tank
Heat pump
Controlling center
Room thermostat 3
Room thermostat 4
Floor heating 1 Floor heating 2
Room thermostat 2
Room thermostat 1
P2
OFF
C
C
OFF
C
C
OFF
C
C
OFF
C
C
fan coil 1 fan coil 2
BV
0.1-0.6Bar
water tank
Heat pump controller

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Heat pump installation notes
• e heat pump must be installed in open space. Normally is installed on the roof of house.
• e unit should be installed in dry and well-ventilated environment. If the humidity in the environment
is high, electronic components may get corrosion or short circuit.
• Do not install the heat pump in environment with corrosive, volatile, or ammable liquid or gas.
• Although noise levels are low, it is not recommended to install the machine near a bedroom.
• e bottom of the heat pump must be at 200mm or more from the ground. Rain water or snow may enter
inside if the installation is on ground. Heat pump can be installed on concrete basic or steel support.
• Please install a shed for the heat pump, otherwise, rain water can reduce the life of the body and snow
may cover the air outlet.
• Water drainage ditch should be set around the heat pump for condensate water and defrost cycle ice
melting.
• Heat pump should far away from kitchen exhaust. e grease could damage the nned coil and reduce
eciency of the device.
• Heat pump must be installed on at concrete blocks, raised concrete platform or steel bracket.
• Between heat pump and concrete base or bracket, anti-shock pads should be placed.
• Before make concrete base or bracket, please check heat pump dimension
• Before xing heat pump check the direction according to project design.
• Use expansion bolts to x heat pump on concrete basic.
• Circulating water pipe must be ≥DN25 (or PPR32). Pipes must be insulated.
• When install water temperature sensor on pipe (on water tank), make sure the sensor is not in direct
contact with water.
Concrete basic
Anti-shock pad
Steel bracket
Expansion bolt

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2000 500.00
500.00
500.00
500.00
200.00
2000 500.00
Distances to barriers and the ground
Ground
Back
Front

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Connection diagram 220 V (Voltage: 220 V 240 V/50 Hz or 60 Hz/1 Ph)

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Connection diagram 380 V (Voltage: 380 V 420 V/50 Hz or 60 Hz/3 Ph)

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Terminals
PE
L1 L2 L3 N
Power supply 380 - 420 V
PEL3 N
Power supply 220- 240 V
Model Line (mm2)
Max.
Current(A)
FGS10MB 2.5 8.25
FGS20MB 4 14.48
FGS20MBFGS10MB