MegaLife ML-RS-2.4/D270ANbA-K User manual

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Owner's Manual
Original Instructions
Air Source Heat Pump Water Heater
Models:
0/RS-2.4/D270ANbA-K

To Users
Thank you for selecting our product. Please read this instruction manual
carefully before installing and using the product, so as to master and correctly use
the product. In order to guide you to correctly install and use our product and
achieve expected operating effect, we hereby instruct as below:
(1) This appliance 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 by a person responsibility for their safety.
Children should be supervised to ensure that they do not play with the
appliance.
(2) In order to ensure reliability of product, the product may consume some
power under stand-by status for maintaining normal communication of
system and preheating refrigerant and lubricant. If the product is not to be
used for long, cut off the power supply; please energize and preheat the
unit in advance before reusing it.
(3) Please properly select the model according to actual the using
environment, otherwise it may impact the using convenience.
(4) This product has gone through strict inspection and operational test
before leaving the factory. In order to avoid damage due to improper
disassembly and inspection, which may impact the normal operation of
unit, please do not disassemble the unit by yourself. You can contact with
the special maintenance center of our company if necessary.
(5) When the product is faulted and cannot be operated, please contact with
our maintenance center as soon as possible by providing the following
information.
1) Contents of nameplate of product (model, cooling/heating capacity,
product No., ex-factory date).
2) Malfunction status (Specify the situations before and after the error
occurs).
(6) All the illustrations and information in the instruction manual are only for
reference. In order to make the product better, we will continuously
conduct improvement and innovation. We have the right to make

necessary revision to the product from time to time due to the reason of
sales or production, and reserve the right to revise the contents without
further notice.
(7) The final right to interpret for this instruction manual belongs to
Exception Clauses
Manufacturer will bear no responsibilities when personal injury or property loss
is caused by the following reasons:
(1) Damage the product due to improper use or misuse of the product;
(2) Alter, change, maintain or use the product with other equipment without
abiding by the instruction manual of manufacturer;
(3) After verification, the defect of product is directly caused by corrosive gas;
(4) After verification, defects are due to improper operation during
transportation of product;
(5) Operate, repair, maintain the unit without abiding by instruction manual or
related regulations;
(6) After verification, the problem or dispute is caused by the quality
specification or performance of parts and components that produced by
other manufacturers;
(7) The damage is caused by natural calamities, bad using environment or
force majeure.
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Contents
1 Safety Notices (Please be sure to abide).............................1
2 Technical description ...........................................................6
2.1 general description.......................................................................6
2.2 Main parts..................................................................................... 7
2.3 Operating principle .......................................................................9
2.4 Technical specifications..............................................................10
3 Installation.......................................................................... 11
3.1 Important hint...............................................................................11
3.2 Basic Requirement on Installaion Location................................12
3.3 Selection for Water Heater Installation Location........................12
3.4 Installation Space Requirement and Installation Diagram.........13
3.5 Water pipe connection................................................................14
3.6 Unit Installation Diagram............................................................ 15
3.7 Installation Instruction of Wired Controller................................. 15
3.8 Thermal insulation for air outlet..................................................18
3.9 Wired Controller Installation.......................................................19
4 Electrical Installation..........................................................23
4.1 Precautions on Safety................................................................23
4.2 Connection of electric wire.........................................................24
5 Debugging for the complete unit........................................25
6 Method to Supplement or Discharge Refrigerant...............26
6.1 Supplement Refrigerant ............................................................. 26
6.2 Discharge Refrigerant.................................................................26
7 Unit Performance...............................................................27
7.1 Water Heating Capacity..............................................................27
7.2 Operation Performance.............................................................. 27
8 Operation Notices in Winter...............................................28
9 Maintenance......................................................................29
9.1 Water Input and Drainage of Water Tank................................... 29
9.2 Periodic Cleaning for Water Tank...............................................30
9.3 Replacement of magnesium rod ................................................30
9.4 Maintenance of the Unit ............................................................. 31
10 Precautions for Safety Usage..........................................31
11 Malfunction Analysis ........................................................33

Air Source Heat Pump Water Heater
1
1 Safety Notices (Please be sure to abide)
WARNING: If not abide strictly, it may cause severe damage to the unit or
the people.
NOTICE: If not abide strictly, it may cause slight or medium damage to the
unit or the people.
This sign indicates that the operation must be prohibited. Improper
operation may cause severe damage or death to people.
This sign indicates that the items must be observed. Improper operation
may cause damage to people or property.
WARNING!
This product can’t be installed at corrosive, inflammable or explosive
environment or the place with special requirements, such as kitchen. Otherwise, it
will affect the normal operation or shorten the service life of the unit, or even cause
fire hazard or serious injury. As for the special places above, please adopt special
product with anti-corrosive or anti-explosion function.
Air source water heater is a thermal storage water heater. The user shall open
the cold water valve first, then adjusting cold and hot water flow to proper water
temperature gradually to avoid scald injury. If not using the unit in winter in short
time, please ensure that it is energized for the whole 24h, if not unit using the unit
for a long period, discharge water in water tank and pipeline in case the system is
frosted. If you think the discharge operation is inconvenient, please directly contact
our local distributors or authorized service branch, we will appoint special staff to
provide inspection, debug, cleaning and maintenance services.
This manual is the usage and installation manual for unitary air source water
heater. Usage method for displayer shall refer to the attached Displayer Manual.

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Water tank must install TP valve as required, the TP valve provided by user;
Try to use tap water, avoid not using well water or river water;
To guarantee water quality, clean the water tank periodically as required;
Water tank shall be installed in places without rainwater. If not, take
rain-proof measures.
NO.
Safety Notices
Graphic symbol
1
★Once abnormality like burning smell occurs,
please cut off the power supply immediately and
then contact with service center.
If the abnormality still exists, the unit may be
damaged and electric shock or fire may result.
2
★Don't operate water heater with wet hand.
Otherwise, it may cause electric shock.
3
★Before installation, please see if the voltage of
local place accords with that on nameplate of unit
and capacity of power supply, power cord or socket
is suitable for input power of this unit.
4
★Special circuit must be adopted for power supply
to prevent fire.
Do not use octopus multipurpose plug or mobile
terminal board for wire connection.
5
★Be sure to pull out the power plug and drain the
main unit and water tank when water heater is not in
use for a long time.
Otherwise, the accumulated dust may cause
overheating, fire or freeze of water tank or coaxial
heater exchanger in winter.
6
★Never damage the electric wire or use the one
which is not specified.
Otherwise, it may cause overheating or fire.

Air Source Heat Pump Water Heater
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NO.
Safety Notices
Graphic symbol
7
★Before to clean, please cut off the power supply.
Otherwise, an electric shock hazard may be
caused.
8
★The power supply must adopt special circuit with
leakage switch and enough capacity.
9
★This appliance 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 by a person responsible for their safety.
Children should be supervised to ensure that they
do not play with the appliance.
10
★Earthing: the unit must be earthed reliably! The
earthing wire should connect with special device of
buildings.
If not, please ask the qualified personnel to
install. Furthermore, don't connect earth wire to gas
pipe, water pipe, drainage pipe or any other
improper places which professional does not
recognize.
11
★Do not put any foreign matter into the unit,
otherwise it would cause the unit being damaged or
result in danger. Never put your hands at the air
outlet of the unit.
12
★Do not repair the unit by yourself, in case of
electric shocks or fire hazards. Please contact the
0/(OHFWURQLFV appointed service center.
13
★Do not step or place objects on the unit, as they
would be injured or damaged when falling off.
14
★Do not block the air inlet of the unit, otherwise it
would reduce the efficiency of the unit, stop it, or
even result in fire hazards.

Air Source Heat Pump Water Heater
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NO.
Safety Notices
Graphic symbol
15
★Keep the chemical spray, gas tank or others
similar at least 1m away from the unit, otherwise it
would lead to fire hazards or explosion.
16
★To improve durability of the water tank, a
Magnesium rod is installed inside the water tank.
The Magnesium rod has a lifespan of two to three
years, and must be replaced by professional
maintenance personnel if a replacement is required.
17
★If thermal water tank has no water or water is not
full, please do not energize the unit for startup,
otherwise, it might damage the unit or result in fire
hazard.
18
★It is highly recommended to place the unit where
good ventilation is available.
19
★Open the TP valve handle on a regular (about
one month) basis to check whether it is blocked.
Perform sewage disposal by following the guide on
a regular (about once a year) basis.
Notes: The TP valve provided by user.
20
★It is normal that the TP valve drips.

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NO.
Safety Notices
Graphic symbol
21
★The pressure relief opening of the TP valve must
be connected to one end of a securely fixed guide
hose, and the other end is connected to the floor
drain. Ensure that the guide hose is not twisted or
folded.
22
★It is recommended to install horizontally the filter
downstream of the main cut-off valve of the user’s
water pipe. Please note that the direction arrow on
the filter shall indicate the direction the same as the
water flow. When it is required to remove impurity
inside the water circuit, open the end cover of this
filter.
23
★When the filter is installed vertically, the direction
arrow can not be upward and the end cover shall be
placed slantwise downwards.
24
★This marking indicates that this product should
not be disposed with other household wastes
throughout the EU. To prevent possible harm to the
environment or human health from uncontrolled
waste disposal, recycle it possibly to promote the
sustainable reuse of material resources. To return
you used device, please use the return and
collection systems or contact the retailer where the
product was purchased. They can take this product
for environmental safe recycling.
25
★This unit contains fluorinated gas with
greenhouse effect covered by the Kyoto Protocol.
Maintenance and disposal must be carried out by
qualified persons only.
Refrigerant gas R134a, GWP=1430.
26
★The fuse model and rated value are in
accordance with the corresponding controller or the
silk screen attached on the protective tube.

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2 Technical Description
2.1 General Description
(1) High Efficiency and Energy-saving
This unit adopts the adaptive control of the electronic expansion valve, whose
opening angle will be adjusted automatically according to the working condition of
the unit. This unit is using the heat in the air to heat the domestic water. It will
operate at the optimized condition all the time under the condition of ensuring
reliability. The water tank adopts external winding microchannel heat exchanger,
which is contacted with the inner port directly for ensuring high heat-exchanging
efficiency and better pressure-bearing capacity. The high-efficiency heat-conducting
materials are adopted between microchannel heat exchanger and inner port of
water tank for better thermal conductivity.
(2) Reliable and durable
Adopt the special compressor for the heat pump water heater, high
temperature and high pressure resistant. The water tank adopts the advanced
stainless steel inner port, equipping with the anticorrosive design for the super-long
magnesium. The complete unit is with multiple kinds of protection.
(3) Eco-friendly and safe
Adopt eco-friendly R134a refrigerant, no pollution to air and no risk of carbon
monoxide poisoning for ensuring safety.
(4) Convenient for installation
The installation is not limited by the environment, which can be installed at
carbarn, storage room, basement, balcony and so on. Not need person to take care
of it. It’s applicable for family and villa and other places, no circulating waterway
system. It’s very convenient for installation and maintenance.
(5) Deluxe configuration
The unit is equipped with high-class touchable wired controller. There’s
hotwater, save, preset, night and electric heating five kinds of heating mode for free
selection. The setting range for the water temperature is 35℃～70℃. You can
select fast heating, timer ON and OFF, preset, i-know, disinfect and other functions.

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(6) Intelligent defrosting
The unit is with freeze prevention and auto defrosting functions, which can
solve the problem of icing and frost.
(7) High water temperature
The highest heating temperature for the heat pump can be up to 70℃, which
can satisfy the requirement for different places and users.
(8) All-weather operation
This unit can provide hot water all the year round.
2.2 Main Parts
2.2.1 Appearance
Because of the product improvement, the actual product may be different from
the skect map. Please refer to the actual product.
Figure 2-1 Sketch map for the appearance

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2.2.2 Main Parts
1 Compressor
2 Inspiration temperature sensor
3 Refrigerant-affusing nozzle
4 Wiring box
5 Controller
6 Faceplant nog
7 Wire hole
8 Water temperature sensor
9 Magnesium rod
10 Water temperature controller
11 Electric heating component
12 Water temperature sensor
13 Cold water inlet
14 Drain outlet
15 Microchannel heat exchanger
16 Hot water outlet
17 TP valve meatus
18 Condensate drain outlet
19 Fan
20 Fan groupware
21 Evaporator
22 Electronic expansion valve
23 Four-way valve
24 High pressure switch
25 Exhaust temperature sensor
Figure 2-2 Sketch map for main parts

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2.3 Operating Principle
Figure 2-3 Air source water heater operating principle
The air source water heater is driving the compressor by some part of
electricity by using the heat pump principle. Through the thermal circuit, absorb the
heat from the low-grade energy (air) in the surrounding environment, transmit it to
the heat exchanger of water tank and then release it to the water inside the water
tank for heating water.
The heating principle for air source water heater and heat pump air conditioner
is the same. Heat pump air conditioner supplies the absorbed heat from natural
environment to indoor air, while air source will use that heat to heat domestic water.
Air source water heater is a kind of new, high-efficiency, energy-saving and
eco-friendly water heater.

Air Source Heat Pump Water Heater
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2.4 Technical Specifications
Model
0/RS-2.4/D270ANbA-K
Rated Heating Capacity(*)
W
2400
Rated Input Power(*)
W
685
COP(*)
W/W
3.50
Capacity
L
270
Load Profile
-
XL
COPDHW(**)
W/W
2.61
Energy Efficiency Class(**)
-
A
Water Heating Energy Efficiency(**)
-
105%
Annual electricity consumption
(average climate conditions)
kWh
1594
Maximum Input Power
W
1300+1500W (Electric Heater)
Outlet Water Temperature
°C
Default: 55°C , 35°C ~70°C
Power Supply
-
220V-240V ~50Hz
Insulation Level
-
Ⅰ
Protection of Ingression
-
ⅠPX4
Refrigerant
Name
R134a
Charge
kg
1.10
Outline Dimensions
W x D x H
mm
660×667×1958
Package Dimensions
W x D x H
mm
813×813×2100
Gross/Net Weight
kg
See the nameplate
Sound Power Level(***)
dB(A)
60
Operating Range
°C
-7~45
Notes:
(1) (*) Value obtained with the following conditions: Outdoor temperature: 20°C
DB/15°C WB; Water tank temperature (start/end): 15°C /55°C.
(2) (**) Value obtained with an air temperature of 7°C and a water inlet at 10℃,
as per EN16147-2011, (EU) No 814-2013.

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(3) (***) Value obtained indoor placement, with 2m long suction and backflow
conduits, as per EN 12102-2008, (EU) No 814-2013.
(4) The installation of suction and backflow conduits on the heat pump lessens
its performance.
(5) Under RAPID function, electric heater helps to heating water.
(6) Please always see the nameplate for the exact data as this table is subject
to change.
3 Installation
3.1 Important Hint
(1) The air source water heater must be installed by professional person
according to national wiring regulation and this instruction manual.
(2) Although the heat pump can operate when the ambient temperature is
above -7℃，the water heater can only be put indoors and must be installed
at the places where the ambient temperature is above 0℃. If the ambient
air temperature falls lower than 0℃, the condensate water drainage may
be freezing.
(3) If it needs to install and move the air source water heater, please contact
󳳭󰿦󵰆󵌕󶈐
appointed local maintenance center. If the air source water
heater is installed by unappointed unit, 
won’t take the responsibilities
for the malfunction and other problems due to the installation.
(4) If the users use the own prepared installation materials to install the air
source water heater, 󵌕󵌕󵌕󵌕 󰾡
won't take any responsibilities for all the loss
due to leakage of pipeline, drop of unit and poor installation.
(5) The water quality for the air source water heater should comply with the
local sanitation standard for the domestic drinking water. If using the water
in well, ground water or sea water, it will accelerate the consumption of
magnesium rod in water tank and shorten the service life of the unit.
(6) The water passed through the iron-exchange water softener will accelerate
the consumption of magnesium rod of water tank. Therefore, you are not
suggested connecting the water softener to the water inlet of air source
water heater.
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Air Source Heat Pump Water Heater
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3.2 Basic Requirement on Installaion Location
The unit will go into faults when installed in the locations listed below. If
inevitable, please contact the 
appointed service center for further service.
(1) Where there are intense heat sources, steam, inflammable or explosive
gas or volatile substances.
(2) Where there are high-frequency devices, like welding machines, medical
equipments, etc.
(3) Where the environmental PH is high, voltage fluctuation is high, vehicle
and ship are located.
(4) Where there is oil (mechanical oil) in air.
(5) Where there is sulphide gas.
(6) Other special environments.
3.3 Selection for Water Heater Installation Location
(1) Suggest install the unit indoors. But do not make the wind blowing to the
living room.
(2) The noise and air flow generated at the air outlet will not influence your
neighbors, animals and plants.
(3) Good ventilation is available.
(4) It is able to withstand the weight and vibration of the unit and it is available
for safe installation.
(5) It is dry but not subject to direct sunlight or strong wind.
(6) Don’t install it in places with electromagnetic interference.
(7) It agrees with the installation dimensions of the unit and is accessible for
inspection and maintenance.
(8) It is out of touch of the children.
(9) It will not affect the public passages and the city layout.
Notes：
①As unit operation will generate cold air, certain noise will occur, do not
install it in places with frequent activity by the user. Any harmful effect due
to improper installation location,  shall not be liable.
②Due to installation location limit, if this model cannot meet installation
demand, please choose other water heaters of RXU models.
0 /(OHFWURQLFV
0 /(OHFWURQLFV

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3.4 Installation Space Requirement and Installation
Diagram
3.4.1 Main Size
Figure 3-1 Sketch map for main size
Model
A(mm)
B(mm)
C(mm)
D(mm)
0/RS-2.4/D270ANbA-K
1958
984
235.5
620
3.4.2 Installation Requirement
(1) Do not point the air outlet of water heater at the upwind direction.
(2) The water heater should be installed at the places where the ambient
temperature is above 0℃; The distance between hot water outlet and the
hot water using position can’t be too long. Conduct heat treatment
protection for the hot water pipeline to reduce heat loss.
(3) The distance between water heater and surrounding wall or other shelter
objects can’t be too small. The installation space should satisfy the drawing
requirement.

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(4) If install a rain shed for protecting the water heater, please make sure that it
won’t affect the heat radiation and absorption for the heat exchanger.
(5) The water heater should be installed at the solid place uprightly. Fix the
water heater with ground bolt if necessary.
(6) There should be tap water pipe, joint of hot water pipe and floor drain
nearby the water heater for water supply for water tank, hot water supply
and water drainage.
(7) Condensate water drainage: connect the drainage hose to the drainage
hole on the unit according to the drawing tightly and then lead to drainage
hose to proper place for discharge.
3.5 Water Pipe Connection
(1) Pipeline preparation
Adopt the special pipe for the hot water exit pipe of water heater. S2.5 series
PPR pipe with the external diameter of dn20 are suggested. If adopt other similar
insulated pipe materials, you can select it by referring to above external diameter
and the pipe thickness. Aluminium pipe are not suggested to be adopted.
(2) Installation of water inlet pipe and water outlet pipe of water tank
The water inlet pipe must be installed with safe device, strainer and cut-off
valve, and the installation sequence must be the same with the sketch map of unit
installation. A cut-off valve must be installed on the water outlet pipe.
For the convenience of drainage or clean for water tank, you are suggested to
install a three-way valve and a cut-off valve at the water outlet of water tank; if the
water tank is far away from the water using point (hot water pipe is more than 20m)
or the hot water using point is lower than the cold water inlet of water tank,
three-way valve and cut-off valve must be installed.
(3) Installation of drainage pipe
Take out the choke plug of drainage outlet, and then connect the drainage
outlet and the floor drain with pipeline. The position for the connection end for
drainage pipeline and floor drain should be lower than the bottom part of water tank;
otherwise, the water can’t drain completely. A cut-off valve must be installed at the
drainage pipeline, and the cut-off valve must be installed at the position where is
convenient for the operation.

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3.6 Unit Installation Diagram
3.7 Installation Instruction of Wired Controller