Daitsu AQUATANK MB 300L User manual

AQUATANK MB 300L
Serie
WITD-AQUATANK MB-300-2
WITD-AQUATANK MB-300-3
Edition
07-23
USER MANUAL

To Users
Thank you for selecting this 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 equipment should be installed, operated or maintained by the qualified servicemen who have had
specic training. During operation, all safety issues covered in the labels, User’s Manual and other literature
should be followed strictly. This equipment 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.
(2) 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 our designated dealer or local service
center for professional support if necessary.
(3) When the product is faulted and cannot be operated, please contact our designated dealer or local service
center as soon as possible by providing the following information..
•Contents of nameplate of product (model, cooling/heating capacity, product No., ex-factory date).
•Malfunction status (specify the situations before and after the error occurs).
(4) 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 without further notice.

Contents
Safety Notices (Please be sure to abide ) ...................................................................1
2. Outline Dimensions................................................................................................... 6
3. Installation Instructions............................................................................................ 7
4. Wiring Diagrams........................................................................................................8
5. Connection of the Waterway System ......................................................................9
6. Safety Considerations............................................................................................. 11
7. Maintenance of the Water Tank.............................................................................. 12
7.1 Water charging and draining...........................................................................................12
7.2 Periodic cleaning for water tank......................................................................................12
7.3 Requirements on water quality ......................................................................................12
7.4 Mg-stick peplacement .....................................................................................................13

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.
NOTE
After receipt of the unit, check it for appearance, unit model compared with your desire
and attachments.
Design and installation work of the unit must be performed by authorized personnel
according to applicable laws and regulations and this Instruction.
After installation work, the unit cannot be energized unless there is not any problem in
check.
Ensure periodical clean and maintenance of the unit after normal operation of the unit
for longer life and reliable operation.
If the supply cord is damaged, it must be replaced by the manufacturer, its service
agent or similarly qualied persons in order to avoid a hazard.
The appliance shall be installed in accordance with national wiring regulations.
This product is a kind of comfort air conditioning, and is not allowed to be installed
where there are corrosive, explosive and inammable substances or smog; otherwise
it would lead to operation failure, shortened service life, five hazard or even severe
injuries. Special air conditions are required for where mentioned above.
Correct Disposure
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 responsibly to promote the
sustainable reuse of material resources. To retuern your 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.

2
WARNING
Once abnormality
likeburning smell occurs,
please cut o󰀨 the power
supply immediately and
then contact with service
center.
If the abnormality still exists,
the unit may be damaged
and electric shock or re
may result.
Don't operate the unit with
wet hand.
Otherwise, it may cause
electric shock.
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.
Special circuit must be
adopted for power supply
to prevent re.
Do not use octopus
multipurpose plug or mobile
terminal board for wire
connection.
Be sure to pull out the
power plug and drain the
indoor unit and when unit
is not in use for a long time.
Never damage the
electric wire or use
the one which is not
specied.
Otherwise, it may
cause overheating or
re.
Before cleaning please cut
o󰀨 the power supply.
Otherwise, it may cause
electric shock or damage.
The power supply must
adopt special circuit with
leakage switch and enough
capacity.
User can not change
power cord socket
without prior consent.
Wiring working
must be done by
professionals. Ensure
good earthing and
don't change earthing
mode of unit.

3
Earthing: the unit must
be earthed reliably ! The
earthing wire should
connect with special device
of buildings.
If not, please ask the
qualied 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.
Keep pressurized spray,
gas holder and so on away
from the unit above 1m .
It may cause re or
explosion.
Unit should be installed
at the place with good
ventilation to save
energy.
When there is not water in
water tank, never power the
unit on to run.
WARNING
Should repair be necessary, contact your nearest authorized service centre. Any
repairs carried out by unqualied personnel may be dangerous. If a stationary appliance
is not tted with a supply cord and a plug, or with other means for disconnection from
the supply mains having a contact separation in all poles that provides full disconnection
under overvoltage category III conditions, the instructions shall state that means for
disconnection must be incorporated in the fixed wiring in accordance with the wiring
rules.
This appliance can be used by children aged from 8 years and above and persons
with reduced physical, sensory or mental capabilities or lack of experience and
knowledge if they have been given supervision or instruction concerning use of the
appliance in a safe way and understand the hazards involved. Children shall not play
with the appliance. Cleaning and user maintenance shall not be made by children
without supervision.
The appliance shall be stored so as to prevent mechanical damage from occurring.

Water Tank
4
NOTE
Before use the appliance, read the owner’s manual rst.
Before installation, please check if the adopted power is accordance with that listed on
nameplate, and check the safety of power.
Before using, please check and confirm if wires and water pipes are connected
correctly to avoid water leakage, electric shock or re etc.
Don’t operate the unit with wet hand, and don’t allow children to operate the unit.
The On/o󰀨 in the instruction is for the operation to on and o󰀨 button of PCB for users;
cut o󰀨 power means to stop supplying power to the unit.
Don’t directly expose the unit under the corrosive ambient with water or dampness.
Don’t operate the unit without water in .
The water in unit and pipeline should be discharged if the unit is not in use, to prevent
the water tank, pipe line and water pump from frost-cracking.
The power cord must be separated with the communication line.
Servicing shall only be performed as recommended by the equipment manufacturer.
If the supply cord is damaged, it must be replaced by the manufacturer, its service
agent or similarly qualied persons in order to avoid a hazard.
If any hot work is to be conducted on the equipment or any associated
parts,appropriate fire extinguishing equipment shall be available to hand. Have a dry
powder or CO2 re extinguisher adjacent to the charging area.
NOTEte
Where electrical components are being changed, they shall be t for the purpose
and to the correct specification. At all times the manufacturer’s maintenance and
service guidelines shall be followed. If in doubt consult the manufacturer’s technical
department for assistance.
Repair and maintenance to electrical components shall include initial safety checks
and component inspection procedures. If a fault exists that could compromise safety,
then no electrical supply shall be connected to the circuit until it is satisfactorily dealt
with. If the fault cannot be corrected immediately but it is necessary to continue
operation, an adequate temporary solution shall be used. This shall be reported to the
owner of the equipment so all parties are advised.
Initial safety checks shall include: that capacitors are discharged: this shall be done
in a safe manner to avoid possibility of sparking; that no live electrical components
and wiring are exposed whiule charging, recovering or purging the system; that there
is continuity of earth bonding.

Water Tank
5
During repairs to sealed components, all electrical supplies shall be disconnected
from the equipment being worked upon prior to any removal of sealed covers, etc. If
it is absolutely necessary to have an electrical supply to equipment during servicing,
then a permanently operating form of leak detection shall be located at the most
critical point to warn of a potentially hazardous situation.
Particular attention shall be paid to the following to ensure that by working on
electrical components, the casing is not altered in such a way that the level of
protection is affected. This shall include damage to cables, excessive number of
connections, terminals not made to original specication, damage to seals, incorrect
tting of glands, etc.
Ensure that apparatus is mounted securely.
Ensure that seals or sealing materials have not degraded such that they no longer
serve the purpose of preventing the ingress of ammable atmospheres. Replacement
parts shall be in accordance with the manufacturer’s specications.
NOTE The use of silicon sealant may inhibit the e󰀨ectiveness of some types of leak
detection equipment.
Intrinsically safe components do not have to be isolated prior to working on them.
Do not apply any permanent inductive or capacitance loads to the circuit without
ensuring that this will not exceed the permissible voltage and current permitted for the
equipment in use.
Intrinsically safe components are the only types that can be worked on while live in
the presence of a ammable atmosphere. The test apparatus shall be at the correct
rating.
Check that cabling will not be subject to wear, corrosion, excessive pressure,
vibration, sharp edges or any other adverse environmental e󰀨ects. The check shall
also take into account the e󰀨ects of ageing or continual vibration from sources such
as compressors or fans.
Under no circumstances shall potential sources of ignition be used in the searching
for or detection of refrigerant leaks. A halide torch (or any other detector using a naked
ame) shall not be used.

6
2. Outline Dimensions
Model WITD-AQUATANK MB-300-2 SXTVD300LC/B-M
Litre 300L 300L
D(mm) 620 620
D1(mm) 530 530
H(mm) 1585 1585
A(mm) 640 640
B(mm) 348 348
DHW Outlet
Water Inlet
(Heat Pump)
Water Outlet
(Heat Pump)
DHW Inlet

7
Model WITD-AQUATANK MB-300-2 WITD-AQUATANK MB-300-3
C(mm) 198 198
E(mm) 117 117
F(mm) 114 114
G(mm) 631 631
I(mm) 283 283
J(mm) 174 174
K(mm) 353 353
L(mm) 789 789
Model WITD-AQUATANK MB-300-2 WITD-AQUATANK MB-300-3
Outline (Diameter×H) (mm) Φ620×1585 Φ620×1585
Package (W×D×H)(mm) 815×920×1745 815×920×1745
Net weight kg 105 105
Gross weight kg 132 132
Joints Dimension
Description Joint pipe thread
Hot water outlet of water tank 3/4″Female BSP
Circulating water inlet/outlet of water tank 3/4″Female BSP
Cooling water inlet of water tank 3/4″Female BSP
Pipe joint 3/4″Female BSP
3. Installation Instructions
The insulated water tank should be installed and keep levelly within 5m and vertically within 3m from the indoor
unit. It can be installed in the room.
Standing water tank must be installed vertically with the bottom on the ground, never suspended. Installation
place must be rm enough and the water tank should be xed on the wall with bolts to avoid vibration, as shown in
the following gure. Weight capacity of water tank during installation should also be considered.
Wall
Water Tank
Fixing Strap
Floor
The minimum clearance from the water tank to combustible surface must be 500mm.
There should be water pipe, hot water joint and oor drain near the water tank in favor of water replenishment,
hot water supply and drainage of water tank.
Connection of inlet/outlet waterway: Connect the safety check valve attached with the unit (with the arrow on it
pointing at the water tank) with the water inlet of water tank with PPR pipe according to the following gure, sealing
with unsintered tape. The other end of the safety check valve should connect with tap water joint. Connect the hot
water pipe and water outlet of water tank with PPR pipe.

8
Tap water
Safety check valve
Notes
(1) For safe use of water, water outlet/inlet of water tank must connect with a certain length of PPR pipe ,L
≥70×R2(cm, R is inside radius of the pipe). Moreover, heat preservation should be conducted and metal
pipe cannot be used. For the rst use, water tank must be full of water before the power is on.
(2) The water may drip from the discharge pipe of the pressure-relief device and that this pipe must be left
open to the atmosphere.
(3) The pressure-relief device is to be operated regularly to remove lime deposits and to verify that it is not
blocked.
(4) The discharge pipe connected to the pressure-relief device is to be installed in a continuously downward
direction and in a frost-free environment.
(5) The appliance is intended to be permanently connected to the water mains and not connected by a hose-
set.
(6) The type of the pressure-relief device is A3J, and this device shall be installed with threaded connection.
(7) The replenishing water pressure in water tank shall be beyond 0.2MPa and below 0.7MPa.
(8) The method of water drainage must be operated strictly abide by the instruction on the label of the water
tank.
4. Wiring Diagrams
(1) Single-phase water tank

9
(2) 3-phase
5. Connection of the Waterway System
(1) If connection between water tank and indoor unit should be through the wall, drill a hole Φ70 for pass of
circulating water pipe. It is unnecessary if the hole is not needed.
(2) Preparation of pipelines: Circulating water outlet/inlet pipe must be hot water pipe, PPR pipe with nominal
out diameter of DN25 and S2.5 series (wall thickness of 4.2mm) being recommended. Cooling water inlet
pipe and hot water outlet pipe of water tank should also be hot water pipe, PPR pipe with nominal out
diameter of DN20 and S2.5 series (wall thickness of 3.4mm) being recommended. If other insulated pipes
are adopted, refer to the above dimensions for out diameter and wall thickness.
(3) Installation of circulating water inlet/outlet pipes: connect the water inlet of the unit with circulating outlet of
water tank and water outlet of unit with circulating inlet of water tank.
(4) Installation of water inlet/outlet pipes of the water tank: safety check valve, lter and cut-o󰀨 valve must be
installed for the water inlet pipe according to the installation sketch of the unit. At least a cut-o󰀨 valve is
needed for the water outlet pipe.
(5) Installation of blow-o󰀨 pipes at the bottom of water tank: connect a piece of PPR pipe with drainage outlet
to oor drain. A cut-o󰀨 valve must be installed in the middle of the drainage pipe and at the place where it is
easy to be operated by the users.
(6) After connection of all waterway pipelines, perform the leakage test firstly. After that, bind up the water
pipes, water temp sensor and wires with wrapping tapes attached with the unit.
(7) Refer to Installation Sketch of the Unit for details.

10
Description Joint pipe thread
Circulating water inlet/outlet of main unit 1″Male BSP
Cooling water inlet of water tank 3/4″Female BSP
Circulating water inlet/outlet of water tank 3/4″Female BSP
Hot water outlet of water tank 3/4″Female BSP
Code Name QTY. Function
01842800004P01 Retaining Plate Sub-Assy 2 Fix the water tank to the wall
70210087 Bolt M6X16 4 /
70110066 Swell Screw M8X60 2 /
0738280101 Relief Valve 1/2 1 /
035033000012 Water Pipe Connector 1 Connect the water pipe and Water inlet pipe sub-assy
06332800003 Nut 1 Install on the 3way connector
75042805 Gasket 2 Sealing function, see below blue circle
030059000120 Water inlet pipe sub-assy 2 /
05332800002 Drainage Pipe(Rubber) 1 The drainage pipe using for the relief valve to drainage the
water
70814016 Pipe Hoop Φ13 1 Fix the drainage pipe
2690280000502 Extruded strip 1 Fix the water tank and avoid the damage appearance of the
water tank
0184280000502P Fixing strap 1 Fix the water tank to the wall
Notes
(a) Distance between indoor unit and water tank should not exceed 5m levelly and 3m vertically. If higher,
please contact with us. Water tank on lower and main unit on higher side is recommended.
(b) Prepare the materials according to the above joints dimension. If cut-o󰀨 valve is installed outside the room,
PPR pipe is recommended to avoid freeze damage.
(c) Waterway pipelines can’t be installed until water heater unit is xed. Do not let dust and other sundries
enter into pipeline system during installation of connection pipes.
(d) After connection of all waterway pipelines, perform leakage test rstly. After that, perform heat preservation
of waterway system; meanwhile, pay more attention to valves and pipe joints. Ensure enough thickness of
insulated cotton. If necessary, install heating device for pipeline to prevent the pipeline from freezing.
(e) Hot water supplied from insulated water tank depends on pressure of water tap, so there must be supply of
tap water.
(f) During using, the cut-o󰀨 valve of cooling water inlet of water tank should be kept normally on.

11
6. Safety Considerations
(1) Pressure relief of the water tank
The water may drip from the discharge pipe of the pressure-relief device and that this pipe must be left open to
the atmosphere.
The pressure-relief device is to be operated regularly to remove lime deposits and to verify that it is not blocked
A discharge pipe connected to the pressure-relief device is to be installed in a continuously downward direction
and in a frost-free environment.
(2) Installation of the water tank safety valve
Pressure of the water tank will gradually increase during heating and a safety valve is required to discharge
some water for pressure relief. If not or installed incorrectly, it would cause the water tank to expand, to be
deformed, to be damaged or even lead to personal injury. The arrow → of the water tank safety valve shall point
toward the water tank. No cut-o󰀨 valve or check valve is required between the safety valve and the water tank, as
the safety valve would fail to work. The safety valve requires the drain hose for installation and should be securely
fastened. The drain hose should be led naturally downward into the oor drain without any convex bow, intertwist
or fold. Extra length of the drain hose inside the oor drain should be cut away in case of poor drainage or water
freeze under low atmospheric temperature.The recommended action pressure for the safety valve is 0.7Mpa, the
same as that for the water tank. Do comply with this requirement for section of the safety valve; otherwise the
water tank would fail to work normally.
The drain pipe should go downwards and be connected with the oor drain. Its outlet should be lower than the
bottom of the water tank. A cuto󰀨 valve is required for the drain pipe and should be installed where it is convenient
for operation.
①
②
①Safety valve
②Filter
Drainage
Installation Mode 1 of the Tap Water Safety Valve (Inlet Water Pressure =0.1~0.5MPa)
①②③
① Safety valve
② Check valve
③Filter
Drainage
Installation Mode 2 of the Tap Water Valve (Inlet Water Pressure<0.1MPa)
The safety valve is bypass installed in the installation mode 2. A check valve is required at the tap water pipe
and installed horizontally with the valve cap vertically upwards and the arrow direction at the valve body the same
as the water ow.

12
①②③
①Safety valve
②Regulator
③Filter
Drainage
Installation Mode 3 of the Tap Water Safety Valve (Inlet Water Pressure>0.5MPa)
A pressure maintaining valve is required in the installation mode 3 to make sure the water tank pressure keep
within 0.3~0.5MPa. The arrow direction of the pressure maintaining valve should be the same as the water ow.
Note: the lter, safety valve, check valve, pressure maintaining valve, cut-o󰀨 valve and hose for installation are
not delivered with the main unit and should be prepared by the client.
7. Maintenance of the Water Tank
7.1 Water charging and draining
(1) Operation process for water charging
•Cut o󰀨 the power supply and open the cut-o󰀨 valve at the water inlet of the tap faucet;
•Open the cut-o󰀨 valve at the hot water drain outlet and valve in user water use site;
•Close the valve in user water use site when water is owing out from user water use site;
•Complete water input operation and reenergize the unit.
(2) Operation process for water draining
•Cut o󰀨 the power supply and close the cut-o󰀨 valve at the water outlet of the tap faucet;
•Open the cut-o󰀨 valve at the hot water drain outlet and valve in user water use site;
•Open the cut-o󰀨 valve on the joint (3-way) pipe;
•Close the drainage cut-o󰀨 valve after draining water on the water tank to complete drainage operation.
7.2 Periodic cleaning for water tank
Please clean the water tank periodically to get good-quality water according to the following steps:
(1) Cut o󰀨 the power supply.
(2) Close the cut-o󰀨 valve at the water inlet of the water tank.
(3) Open the cut-o󰀨 valve at the hot water drain outlet and valve in user water use site.
(4) Open the cut-o󰀨 valve in joint (3-way) connector, and wait for drainage of water inside water tank.
(5) Close the cut-o󰀨 valve in joint (3-way) connector, open the cut-o󰀨 valve at the water inlet of the water tank,
close the cut-o󰀨 valve at the water inlet when water ows from user water use site, then reopen the cut-
o󰀨 valve in joint (3-way) connector, repeat the drainage operation, close the cut-o󰀨 valve in joint (3-way)
connector when water discharged is clean.
(6) Conduct water input for the water tank according to water input operation.
(7) Water tank cleaning completed and energize it.
7.3 Requirements on water quality
Paramete Parametric value Unit
pH( 25°C) 6.8~8.0 /
Cloudy ＜1NTU
Chloride ＜50 mg/L
Fluoride ＜1 mg/L
Iron ＜0.3 mg/L
Sulphate ＜50 mg/L
SiO2＜30 mg/L
Hardness(count CaCO3)＜70 mg/L

13
Paramete Parametric value Unit
Nitrate(count N) ＜10 mg/L
Conductance(25°C) ＜300 μs/cm
Ammonia (count N) ＜0.5 mg/L
Alkalinity(count CaCO3)＜50 mg/L
Suld Cannot be detected mg/L
Oxygen consumption ＜3 mg/L
Natrium ＜150 mg/L
Note: when circulation water fails to meet requirements listed in the table above, please add anti-scale
composition to keep the unit always in normal operation
7.4 Mg-stick peplacement
(1) To improve durability of the water tank, a Mg-Stick is installed inside the water tank. Generally, the Mg-Stick
has a lifespan of two to three years. However, if the quality of water used by the water heater is poor, the
Mg-Stick lifespan will be shortened. For Mg-Stick replacement, perform the following steps:
(2) Before removing the Mg-Stick, drain the water tank by following drainage operations.
(3) Open the cap on the mounting mouth for the Mg-Stick in the water tank.
(4) Use a hex key to unscrew the Mg-Stick component, and then steadily removed the magnesium to prevent it
from falling into the inner container of the water tank.
(5) Install a new Mg-Stick component into the mounting mouth of the Mg-Stick, and then tighten it using a hex
key.
(6) Close the cap, and replenish water by following water replenishment operations.
Note: the Mg-Stick must be replaced by professional maintenance personnel. Please directly contact your local
dealer or authorized service center for survice support.

Eurofred S.A.
Marqués de Sentmenat 97
08029 Barcelona
www.eurofred.es