ML ELECTRONICS MegaLife ML-RS-Dm30/NaA-M User manual

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Owner's Manual
Original Instructions
Direct Heating & CirculatingAir Source Heat Pump
Water Heater
Models:
0/RS-Dm30/NaA-M
0/RS-Dm40/NaA-M
0/RS-Dm60/NaA-M

To Users
Thank you for selecting RXU 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 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 󳳭󰿦󵰆󵌕󶈐󵸊󵌔
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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.

Contents
1 Safety Notices (Please be sure to abide ) ............................................................... 1
2 Product Type ........................................................................................................... 1
3 Nomenclature.......................................................................................................... 3
4 Operating Principle.................................................................................................. 3
4.1 Operating Principle............................................................................................................3
4.2 System Diagram................................................................................................................3
4.3 Process Descriptions.........................................................................................................4
5 Technical Data Table................................................................................................ 5
6 Capacity Correction Chart ....................................................................................... 7
7 Installation Requirements...................................................................................... 13
7.1 Unit Outline Dimension and Installation Dimension.........................................................13
7.2 Requirements for Heat Exchange and Maintenance Space............................................14
7.3 Installation Notes.............................................................................................................15
7.4 Installation of Water Flow Switch.....................................................................................18
7.5 Requirements for Water Tank Installation .......................................................................19
8 Installation Schematic Diagram............................................................................. 20
9 Installation of Electrical System............................................................................. 24
10 Controller Installation........................................................................................... 28
10.1 Controller Error Code ....................................................................................................28
10.2 Water Heater Main Board DIP Switch Instructions........................................................29
11 Unit Debugging.................................................................................................... 31
11.1 Check Before Startup....................................................................................................31
11.2 Commissioning..............................................................................................................32
12 Guides for System Discharge Operations............................................................ 34
13 Daily Operation and Maintenance ....................................................................... 35
14 Cleaning of System ............................................................................................. 36
14.1 Cleaning of Air Side Heat Exchanger............................................................................36
14.2 Cleaning of Water System.............................................................................................36
15 Unit Drainage Operations in Winter..................................................................... 37
16 Common Malfunction and Solutions.................................................................... 38

Direct Heating & Circulating 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.
Note: 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 above
special places, please adopt special air conditioner with anti-corrosive or anti-explosion
function .
WARNING!
(1) Installation work must be conducted by the appointed maintenance center. Improper
installations might cause water leakage, electric shock, fire and other accidents.
(2) Be sure not to store or use dangerous materials such as flammable, explosive and
poisonous objects near the unit.
(3) Turn off the main power of the water heater immediately upon malfunction (such as
combustion is smelled and so on).
(4) Do not insert your fingers or other objects into the air outlet or air-in grille.
(5) Do not start or stop the unit through the way of inserting or pull out power cord.
(6) Do not refit, repair or move the unit. If it needs to be repaired, please contact dealer or
professional installer.
(7) Earthing device must be set for hot water unit, heating water tank, thermal storage water
tank, water pump and system pipe network.
Note:
(1) Before installation, please check whether the power is consist with that required on the
nameplate, and then check the safety of the power.
(2) Before operation, please check and confirm whether electric wires and water pipes are
connected correctly for preventing water leakage, electric shock, fire hazard and other
accidents.
(3) The power socket must be equipped with earthing wire for ensuring reliable grounding for
unit and preventing electric shock. Do not connect earthing wire to gas pipe, tap water
pipe, lightening conductor or telephone wires.
(4) Do not operate the unit with wet hands. Do not let children play with the unit.

Direct Heating & Circulating Air Source Heat Pump Water Heater
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(5) Turn on or turn off the unit in this instruction manual is turning on or turning off the
controller; Cut off the power indicates stop supplying power to the unit.
(6) Do not expose this unit in damp environment directly.
(7) If the outdoor ambient temperature is low in winter, do not cut off the power after stop
operation. Otherwise, freeze prevention protection will be invalid.
(8) If the unit won’t be used for a long time, please drain the residual water inside unit, water
tank and pipeline through drainage valve.
(9) Please conduct leakage inspection after installation.
2 Product Type
Series name
Model
Heating capacity (kW)
Appearance
Direct Heating & Circulating
Air Source Heat Pump
Water Heater
󳲡󳮡󱲡RS-Dm30/NaA-M
31
󳲡RS-Dm40/NaA-M
40
󳲡RS-Dm60/NaA-M
60
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0/
0/

Direct Heating & Circulating Air Source Heat Pump Water Heater
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3 Nomenclature
RS
-
□
□
□
/
-
1
2
3
4
5
6
7
8
9
10
SN
Description
Options
1
Product code
RS—Export heat pump water heater
2
Heating method
D—Direct heating;C—Circulating heating;S—Static heating;
Dm-Direct heating modular ;
Cm- Circulating modular
3
Functions
Q—Multifunctional;Null for single function
4
Heating capacity code
Nominal heating capacity(Unit:kW)
5
Inverter system
Pd—DC inverter;Null for fixed speed
6
Water tank mode
E—100L;F—150L;G—200L;H—250L;Null in case of no water tank
7
Climate condition
Null for T1;T2-Low temp;T3-High temp
8
Refrigerant
Null for R22;R407c—N;R410A—Na;R134a—Nb;R417A—Ne
9
Design number
A,B,C…or A1,A2…,B1,B2…
10
Power supply
M:380-415V 3N~50Hz
Example:
RS-Dm40/NaA-M means direct heating modular fixed-speed heat pump water
heater, without water tank, heating capacity of 40kW, refrigerant of R410A, rated voltage of
380-415V 3N/50Hz and applicable for T1 climate.
4 Operating Principle
4.1 Operating Principle
Air source heat pump water heater is developed based on the principle of reverse Carnot
cycle. Driven by a small amount of electricity, with refrigerant as the carrier, it can continuously
absorb low grade heat (-26°C~46°C) in the air, and then transform the heat into usable high grade
heat, which will be released into water so as to generate domestic hot water (Default temperature
is 55°C, and maximum temperature is 70°C), which will be carried by the hot water pipes to users.
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0/

Direct Heating & Circulating Air Source Heat Pump Water Heater
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4.2 System Diagram
Notices:
Generally, air source heat pump water heating system is composed of direct recurrent model
water heater and insulating water tank, including auxiliary devices such as connecting pipes, water
pumps, valves and so on.
Air source heat pump water heater mainly consists of compressor, water side heat exchanger,
air side heat exchanger, throttling device, waterway regulating valves and so on.
4.3 Process Descriptions
Water heater is connected with power. Then it starts to work and enter the heating process.
The low temperature and low pressure refrigerant gas is compressed into high temperature and
high pressure gas after being absorbed into compressor. Then it gets into the water side heat
exchanger and exchanges heat with domestic water. The refrigerant after heat exchange
becomes liquid, and enters into air side heat exchanger after its pressure and temperature is
lowered by electronic expansion valves. It will exchange heat with surrounding air inside the air
side heat exchanger, and evaporate into low temperature and low pressure refrigerant gas, and
then back to compressor for the next circulation. Meanwhile, the domestic water which exchanges
heat with refrigerant inside the water side heat exchanger is heated and flows to heat insulating
water tank upon driving of the water pump.

Direct Heating & Circulating Air Source Heat Pump Water Heater
5
5 Technical Data Table
Model
RS-Dm60/NaA-M
Heating capacity
kW
31
40
60
Heating power input
kW
8.1
10
15
Heating current input
A
14.5
19
28
Coefficient of performance
W/W
3.83
4
4
Rated power input
kW
10.5
13
20
Rated current input
A
20
25
35.4
Nominal hot water output
L/h
667
860
1300
Set temperature
°C
Leaving water temperature: default setting is 55°C ; adjustable in
range of 35°C ~70°C (temperature of water leaving from unit)
Water tank temperature: default setting is 46°C ; adjustable in range
of 30°C ~51°C (heat insulating function will be activated if it is lower
than the temperature)
Power
380-415V 3N~50Hz
Compressor
Type
Totally-enclosed vortex compressor
Quantiry
Unit
1
1
1
Refrigrant
Name
R410A
Charge
kg
3.9
4.73
6.5
Heat
exchanger
Air side
Fin heat exchanger
Water side
Tube in tube heat exchanger
Water System
Circulating water
flow
m3/h
5.3
6.9
10.4
Circulating water
pressure drop
kPa
120
150
120
Permissible
maximum
pressure
MPa
0.8
Maximum Inlet
water pressure
MPa
0.4
Minimum Inlet
water pressure
MPa
0.15
Specification of
pipe joint
Direct model
inlet
inch
G 3/4
G 1
G 1-1/4
Cyclic model
inlet
G 1-1/4
G 1-1/4
G 2
Outlet
G 1-1/4
G 1-1/4
G 2
Outline size
Width ×depth
×height
mm
930×800×1605
930×800×1605
1340×800×1605
Package size
Width ×depth
×height
mm
1010×865×1780
1010×865×1780
1420×880×1775
Noise
dB(A)
≤67
≤67
≤67
Unit net weight /Gross weight
kg
238/252
264/286
362/378
Remarks:
①Data in the above table are based on the following test conditions:
0/
RS-Dm40/NaA-M
0/
RS-Dm30/NaA-M
0/

Direct Heating & Circulating Air Source Heat Pump Water Heater
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Outdoor ambient temperature: 20°C DB/15°C WB; Water inlet temperature: 15°C; Water
outlet temperature: 55°C; Voltage: 380V 3N/50Hz.
②Applicable range:ambient temperature of -26°C~46°C.
③The above pressure values all belong to gauge pressure.
④The listed water resistance refers to the water resistance under rated working conditions.
If the ambient temperature and water inlet temperature are different, unit’s hot water
output will be changed accordingly, and the water resistance may be different from the
listed value.
⑤If the specifications are changed due to product improvement, please refer to parameters
on the nameplate.
⑥onsidering system’s reliability and different requirements for water temperature under
different ambient temperature, the highest water temperature is limited, as shown in the
following curve:
⑦Circulating water flow means the rated flow during the heating operation. When selecting
the water pump model, it shall refer to the flow after overcoming the water resistance,
that is, the flow of corresponding delivery lift, rather than the maximum flow labeled in the
nameplate of water pump.