Daikin EKHTSU200AA User manual

INSTALLATION MANUAL
EKHTSU200AA
EKHTSU260AA
EKUHWHTA
Domestic hot water tank with UK kit
for air to water heat pump system

2
4
1
3
2x 2x 5x 1x 1x 1x
++
+
+++
13 6 75
241x
+
+
340 mm
11
10
12
12
13
2
1
5
4
6
8
3
9
1
2
7
772
902
1032
H
120
Ø60
1156
778
653
694
443
600
300
5
BC
>250
>250
A
>600
30
D
>30
2x
8
9
6+
+
+
+
+
+
1
2
1
2
5
9
3
5
9
3
76
10
10
4
10 4
(*KHBRD)
2
1
3
4

EKHTSU200+260AA + EKUHWHTA
Domestic hot water tank with UK kit for air to water heat pump system
4PW53247-1B
Installation manual
1
C
ONTENTS
Page
Introduction........................................................................................1
General information.....................................................................1
Scope of this manual...................................................................1
Model identification .....................................................................1
Accessories .......................................................................................2
Accessories supplied with the domestic hot water tank .............2
Accessories supplied with the EKUHWHTA kit for
the domestic hot water tank ........................................................2
Optional equipment.....................................................................2
Overview of the unit...........................................................................2
Main components........................................................................2
Outlook diagram..........................................................................3
Installation of the EKHTSU domestic hot water tank.........................4
Installation guidelines..................................................................4
Installing and commisioning the domestic hot water tank ...........4
Installation of the EKUHWHTA kit on the domestic hot water tank....8
Piping requirements ....................................................................8
Installation procedure of the EKUHWHTA kit ..............................9
Maintenance....................................................................................10
Descaling ..................................................................................10
Draining.....................................................................................10
Troubleshooting ...............................................................................10
General guidelines ....................................................................10
General symptoms .................................................................... 10
Technical specifications ...................................................................11
Domestic hot water tank specifications .....................................11
The English text is the original instruction. Other languages are
translations of the original instructions.
I
NTRODUCTION
General information
Thank you for purchasing this domestic hot water tank.
The domestic hot water tank must be installed by a competent
person and be installed in compliance with instructions as of subject
in this manual, all current legislation, codes of practice and
regulations governing the installation of unvented hot water cylinders
in force at the date of installation.
This installation is subject to building regulation approval, notify
Local Authority of intention to install.
The EKHTSU domestic hot water tank can only be connected to a
EKHBRD indoor unit. The domestic hot water tank is available in two
sizes: approximately 200 and 260 litre. All models can be mounted
on top of the indoor unit. For installation of the domestic hot water
tank on the floor next to the indoor unit, the dedicated EKFMAHTA
connection kit is required.
Scope of this manual
This installation manual describes the procedures for installing and
connecting the EKHTSU domestic hot water tank with the
EKUHWHTA kit.
Model identification
Domestic hot water tank
EKHTSU200AA
EKHTSU260AA
EKUHWHTA
Domestic hot water tank with UK kit for air to water
heat pump system
Installation manual
READ THESE INSTRUCTIONS CAREFULLY BEFORE
INSTALLATION. KEEP THIS MANUAL IN A HANDY
PLACE FOR FUTURE REFERENCE.
PLEASE LEAVE THIS MANUAL WITH THE EKHWSU
DOMESTIC HOT WATER TANK AFTER INSTALLATION.
IMPROPER INSTALLATION OR ATTACHMENT OF
EQUIPMENT OR ACCESSORIES COULD RESULT IN
ELECTRIC SHOCK, SHORT-CIRCUIT, LEAKS, FIRE OR
OTHER DAMAGE TO THE EQUIPMENT. BE SURE ONLY
TO USE ACCESSORIES MADE BY DAIKIN WHICH ARE
SPECIFICALLY DESIGNED FOR USE WITH THE
EQUIPMENT AND HAVE THEM INSTALLED BY A
PROFESSIONAL.
IF UNSURE OF INSTALLATION PROCEDURES OR USE,
ALWAYS CONTACT YOUR DAIKIN DEALER FOR
ADVICE AND INFORMATION.
THE UNIT DESCRIBED IN THIS MANUAL IS DESIGNED
FOR INDOOR INSTALLATION ONLY AND FOR AMBIENT
TEMPERATURES RANGING 5°C~35°C.
EK HTS U200 AA
Series
Identification of type
U = Special version for United Kingdom only
Hot water Tank Stainless steel
European Kit

Installation manual
2
EKHTSU200+260AA + EKUHWHTA
Domestic hot water tank with UK kit for air to water heat pump system
4PW53247-1B
A CCESSORIES
Accessories supplied with the domestic hot water tank
See figure 1.
Accessories supplied with the EKUHWHTA kit for the
domestic hot water tank
Optional equipment
EKFMAHTA
Connection kit for installation of the domestic hot water tank on the
floor next to the indoor unit.
Refer to the installation manual of the kit for more details.
O VERVIEW OF THE UNIT
Main components
1 Flexible hose of heat exchanger coil
2 Hot/cold water flexible hose
3 Clamp
4 Installation manual
5 Unpacking instruction sheet
6 3-way valve assembly (body + motor + clamps + pipe + screws)
7 Knockout hole assembly (grommet + clamps + screws)
1 Pressure reducing valve
2 Expansion relief valve
3
Blind stop + 2 plastic screw-on closing caps for pressure reducing valve
4
Reducing coupler 22 mm - 15 mm
5 Expansion vessel of 18 litres
6 Tundish
7 Elbow/Drain valve 22 mm x 3/4” Male BSP
8 Adaptor 22 mm x 3/4” Female BSP
9 T-piece 22 mm x 22 mm x 22 mm
10 Instruction sheet
1x
1x
1x 1x
1x2x
1x
1
1x
234 5
7610
1x
8
1x
9
The total system (indoor unit and outdoor unit) is designed
for combination with a Daikin domestic hot water tank. In
case another tank is being used in combination with the
Daikin indoor unit, Daikin cannot guarantee neither good
operation nor reliability of the system. For those reasons
Daikin cannot give warranty of the system in such case.
A Hot water out connection (G 3/4" Female)
B Temperature and pressure relief valve
C Recirculation connection (G 1/2" Male)
D Thermistor socket
E Flow inlet connection from the main EKHBRD indoor unit at the
bottom of the tank (quick coupling)
F Heat exchanger coil
G Return outlet connection to the main EKHBRD indoor unit at the
bottom of the tank (quick coupling)
H Cold water in connection (G 3/4" Female)
J Thermistor
K Anode
L Casing
M Knockout holes for water piping
A
H
B
C
D
C
B
K
A
H
F
J
E
G
M
L
E
G

EKHTSU200+260AA + EKUHWHTA
Domestic hot water tank with UK kit for air to water heat pump system
4PW53247-1B
Installation manual
3
Safety devices
■ Thermal protector — The EKHBRD indoor unit is equipped with
a thermal protector. The thermal protector is activated when the
temperature becomes too high. When activated, the protector
has to be reset on the indoor unit by pressing the red button (for
access, remove the decoration panels like indicated in the
manual of the indoor unit).
■ Temperature and pressure relief valve
The temperature and pressure relief valve prevents excessive
water temperature (>95°C) and excessive water pressure
( ≥ 10 bar) in the domestic hot water tank.
■ Expansion relief valve (EKUHWHTA kit)
The pressure relief valve prevents excessive water pressure
( ≥ 8 bar) in the water circuit.
Outlook diagram
■ The domestic hot water tank relief valve connections
may not be used for other purpose.
■ This domestic hot water tank can only be used with an
EKHBRD indoor unit.
Switch off the power supply before opening the
decoration panels of the indoor unit.
NOTE
Refer to "Installation of the EKUHWHTA kit on the
domestic hot water tank" on page 8 for connection of
other safety devices in accordance with relevant local
and national regulations.
11
10
12
12
13
2
1
5
4
6
8
3
9
1
2
7
772
902
1032
H1
120
Ø60
H2
778
694
443
600
300
11
5
3
9
4
10
BC
>250
>250
30
D
>30
A
>600
1 Hot water out connection (G 3/4" Female)
2 Cold water in connection (G 3/4" Female)
3 Hot water out connection at the bottom of the tank (quick coupling)
4 Cold water in connection at the bottom of the tank (quick coupling)
5 Recirculation connection (G 1/2" Male)
6 Flow inlet connection from the main EKHBRD indoor unit (quick coupling)
7 Return outlet connection to the main EKHBRD indoor unit (quick coupling)
8 3-way valve
9 Flow inlet connection from the main EKHBRD indoor unit at the bottom of the tank (quick coupling)
10 Return outlet connection to the main EKHBRD indoor unit at the bottom of the tank (quick coupling)
11 Temperature and pressure relief valve (15 mm Male)
12 Knockout holes for water piping
13 Levelling feet (on EKHBRD unit)
Domestic hot water tank model H1 H2
EKHTSU200AA 2010 mm 1847 mm
EKHTSU260AA 2285 mm 2122 mm

Installation manual
4
EKHTSU200+260AA + EKUHWHTA
Domestic hot water tank with UK kit for air to water heat pump system
4PW53247-1B
I NSTALLATION OF THE EKHTSU DOMESTIC HOT
WATER TANK
If required by relevant local and national regulations, connect a
recirculation pump in between the hot water end point and the
recirculation connection of the domestic hot water tank.
Installation guidelines
Keep in mind the following guidelines when installing the domestic
hot water tank:
■ The installation location is frost-free.
■ Standard installation location of the domestic hot water tank is
on top of the indoor unit.
■ The domestic hot water tank can be floor mounted as well. In
that case, the dedicated EKFMAHTA connection kit for
installation of the domestic hot water tank next to the indoor unit
is required and to be ordered separately.
■ Locate the domestic hot water tank in a suitable position to
facilitate ease of maintenance. Refer to the grey-coloured zones
indicated in the outlook diagram figure and to the installation
manual of the EKHBRD indoor unit.
■ To avoid back siphonage it is advised to install a non-return
valve on the water inlet of the domestic hot water tank in
accordance with local and national regulations.
■ Take care that in the event of a leak, water can not cause any
damage to the installation space and surroundings.
■ If installing an EKHTSU* domestic hot water tank, installing the
kit EKUHWHTA is obligatory. Refer to the UK Building
Regulation G3.
Installing and commisioning the domestic hot water tank
Installing the hot water tank on top of the indoor unit
1 Unpack the domestic hot water tank according to the
instructions mentioned on the unpacking instruction sheet.
2 Check if all domestic hot water tank accessories are enclosed
(see "Accessories" on page 2).
3 Remove front and top plate of the indoor unit.
To take away the front decoration panel, remove the 2 bottom
screws and then unhitch the panel.
Mount the top plate of the indoor unit on the domestic hot water
tank module.
4 Connect the 3-way valve
1 Remove drain plate on top of the
indoor unit before installing the
3-way valve.
2 Installation position.
The 3-way valve must be installed in the indoor unit.
3 Unpack the 3-way valve body and 3-way valve motor.
Verify that following accessories are provided with the motor.
■ Installation shall be done by a licensed technician, the
choice of materials and installation shall comply with
local and national regulations.
■ The equipment is not intended for use in a potentially
explosive atmosphere.
■ Domestic hot water quality must be according to EU
directive 98/83 EC.
■ For safety reasons, it is not allowed to add any kind of
glycol to the water circuit.
■ To avoid stagnation of water, it is important that the
storage capacity of the domestic hot water tank meets
the daily consumption of domestic hot water.
In cases where during longer periods of time there is
no consumption of hot water, the equipment must be
flushed with fresh water before usage.
The disinfection function provided on the equipment is
specified in the operation manual of the indoor unit.
■ It is advised to avoid long runs of piping between the
domestic hot water tank and the hot water end point
(shower, bath, ...) and to avoid dead ends.
■ The installation must be in compliance with local and
national regulations and may require additional
hygienic installation measures.
■ For compliance with UK Building Regulations,
thermostatic mixing valves must be installed.
■ Immediately after installation, the domestic hot water
tank must be flushed with fresh water. This procedure
must be repeated at least once a day the first 5
consecutive days after installation.
If available service space to left and/or right side is
limited, carefully consider all indoor module
installation steps first.
3
4
12
1Recirculation connection
2Hot water connection
3Shower
4Recirculation pump
1 Sleeve
2 Valve motor cover
3 Screw
4 Turn knob
1
2
3
2x
1
1
1
2x
2x
2x
2x
4x
1
3
2
1From indoor unit
2To domestic hot water tank
3To room heating
123 4

EKHTSU200+260AA + EKUHWHTA
Domestic hot water tank with UK kit for air to water heat pump system
4PW53247-1B
Installation manual
5
4Put the sleeve on the valve and turn the valve so that the
sleeve is positioned according to the figure below.
5Install the 3-way valve body in the pipework.
Refer to the figure below before making the connection.
6Push the motor on the sleeve.
Make sure not to rotate the sleeve during this action, so as to
maintain the valve position as set during step 4.
7Put the turn knob on the valve motor cover as shown below.
Make sure that the turn knob is completely pushed in to allow
the turn knob being operated automatically by the unit. If the
turn knob is lifted slightly, manual operation is possible.
8Make sure to firmly fix the power supply cord onto the 3-way
valve body with a field supplied cable tie like in illustration
below.
9Perform the wiring in the indoor unit switch box in accordance
with the following figure: (make sure power supply is
switched off)
Make sure to follow the appropriate wiring routing inside of
the unit (this wiring routing can be found in the installation
manual of the indoor unit).
Refer also to the wiring diagram delivered with the indoor
unit.
5Remove the top front decoration panel of the tank module as
indicated in the figure below.
If the valve is not positioned in this way before mount-
ing the motor, the valve will give way to both domestic
water and room heating during operation.
45
45
°45°
45°
45
45
°45°
1
3
56
A
2
A
8
4
7
Room heating Domestic hot water tank
X2M
345
3-way valve
BLU BLK BRN
NYL
2x

Installation manual
6EKHTSU200+260AA + EKUHWHTA
Domestic hot water tank with UK kit for air to water heat pump system
4PW53247-1B
6Mount the tank module on top of the indoor unit using the lifting
holes.
7Connect the flexible hoses as indicated in figure 4.
■The 2 flexible hoses with quick coupling connections on both
sides must be connected to the coil connection as indicated
in figure 4.
■The 2 flexible hoses with quick coupling connection on one
side and threaded connection coupling on the other side
must be connected to the hot water outlet and cold water
inlet (they have to be routed out from the rear plate (see
figure 4). Depending on the installation location (left or right
side installation), punch the required right or left knockout
holes out of the rear plate. Apply the grommet to the edges of
the knocked out holes to protect the flexible piping.
If the recirculation connection is used, connect a tube with
threaded connection to this hole and guide it through a hole
in the rear plate too.
8Fix the side bottom decoration panels of the domestic hot water
tank to the indoor unit.
9Connect the accessories supplied with the EKUHWHTA kit as
explained in "Installation of the EKUHWHTA kit on the domestic
hot water tank" on page 8.
10 Connect the thermistor wire to the indoor unit switch box. Make
sure power supply is switched off. Refer to the wiring diagram
delivered with the indoor unit.
The distance between the thermistor cable and power supply
cable must always be at least 5 cm to prevent electromagnetic
interference on the thermistor cable.
1Plug the thermistor cable connector in the socket X11A on
the PCB.
2Fix the cables to the cable tie mountings with cable ties to
ensure strain relief.
3When routing out cables, make sure that these do not
obstruct mounting of the indoor unit cover.
Because of the weight of the domestic hot water tank,
it is advised to handle and lift it with two persons.
1Hot water out connection (G 3/4" Female)
2Cold water in connection (G 3/4" Female)
3Hot water out connection at the bottom of the tank (quick
coupling)
4Cold water in connection at the bottom of the tank (quick
coupling)
5Recirculation connection (G 1/2" Male)
6Flow inlet connection from the main EKHBRD indoor unit
(quick coupling)
7Return outlet connection to the main EKHBRD indoor unit
(quick coupling)
83-way valve
9Flow inlet connection from the main EKHBRD indoor unit at
the bottom of the tank (quick coupling)
10 Return outlet connection to the main EKHBRD indoor unit at
the bottom of the tank (quick coupling)
1Decoration panel
2Quick fixation hole
3Fasten with 2 screws
2x
2x
2x
2x
1
1
1
1
2
2
2
2
2
2
2
2
3
3
3
3

EKHTSU200+260AA + EKUHWHTA
Domestic hot water tank with UK kit for air to water heat pump system
4PW53247-1B
Installation manual
7
Note: only relevant field wiring is shown.
11 Reattach the drain plate on the indoor unit.
12 Commisioning
Follow the next steps to fill up the tank:
1Open each hot water tap in turn to expel air from the system
pipe work.
2Open the cold water supply valve. Make sure the decoration
panels of both the domestic hot water tank and the indoor
unit are aligned.
3Close all water taps after all air is expelled.
4Check for leaks.
5Manually operate the temperature and pressure relief valve
to ensure free water flow through the discharge pipe (turn
knob left). Refer to "Main components" on page 2 for location
of the temperature and pressure relief valve.
13 Reattach the temperature
and pressure relief valve
insulation piece, and both
front decoration panels of
the domestic hot water
tank.
14 Reattach the front
decoration panel of the
indoor unit.
Installing the hot water tank by the side of the indoor
unit
Refer to the manual delivered with the kit EKFMAHTA.
The domestic hot water tank coil must be filled with
water at the indoor unit water inlet. This to avoid that
dirt enters the system.
BLU BLK BRN
NYL
3-way
valve
X11A
A3P
X2M
3
4
5
3
4
5
>50 mm
2x
2x
2x
123
1Decoration panel
2Insulation piece
3Pressure relief valve
insulation piece

Installation manual
8EKHTSU200+260AA + EKUHWHTA
Domestic hot water tank with UK kit for air to water heat pump system
4PW53247-1B
INSTALLATION OF THE EKUHWHTA KIT ON THE DOMESTIC HOT WATER TANK
Piping requirements
■Tundish
Install the tundishes in a vertical position within a maximum of
500 mm away from the temperature and pressure relief valve on
the domestic hot water tank and the expansion relief valve
included in the EKUHWHTA kit.
■Tundish pipework
Tundish pipework must be 22 mm metal pipe with a minimum
vertical length of 300 mm below the tundish. Maximum
permitted (equivalent) length of 22 mm pipework is 9 m. Each
bend or elbow is equivalent to 0.8 m of pipework.
All pipework must have a continuous fall.
Sizing of copper discharge pipe D2 for common temperature
relief valve outlet sizes
■All pipework and fittings must be flushed free of all flux and debris prior to the fitting of controls of this kit. Failure to do this may
cause irreparable damage to the controls.
■All cautions as under chapter "Installation of the EKHTSU domestic hot water tank" on page 4 remain of extreme importance and
are equally valid in this chapter.
Fixed grating
Trapped
effluent water
>300 mm ≤500 mm
D2
D1
11
7
7
7
2
7
3
13
8
4
12
6
5
≤500 mm
9
13
10 D1
D2
>300 mm
C
H
5
10
D1
≤500 mm
500 mm
≤500 mm
Valve
outlet
size
Discharge pipe
size D1
Discharge pipe
size D2
from tundish
Maximum
resistance
allowed,
expressed as a
length of straight
pipe (i.e. no
elbows or bends)
Resistance
created by
each elbow
or bend
15 mm 15 mm 22 mm up to 9 m 0.8 m

EKHTSU200+260AA + EKUHWHTA
Domestic hot water tank with UK kit for air to water heat pump system
4PW53247-1B
Installation manual
9
■Requirements to discharges
■Discharge piping, tundish, drain valves, etc. must be
positioned away from any electrical components.
■The discharge pipe away from the tundish must terminate in
a safe, visible position without forming any risk to persons in
the vicinity.
If in any doubt, refer to Building Regulation G3.
Installation procedure of the EKUHWHTA kit
1Locate the domestic hot water tank in a suitable position to
facilitate the installation of water supply, discharge fittings and
pipework. It is therefor recommended to first read through this
whole procedure.
Refer to the figure on the facing page at the start of this chapter
for full understanding of next procedure steps.
Pre-assembly
2Pre-assemble the pressure
reducing valve (part 1 of
this kit, refer to page 2) by
mounting the blind stop and
the 2 black plastic screw-on
closing caps (part 3 of this
kit), so that the pressure
reducing valve is ready for installation.
The black plastic plugs in the pressure reducing valve body are
pressure gauge connections to enable pressure monitoring to
be carried out, should the system develop a fault. It is
recommended that these be accessible (the pressure reducing
valve has two - only one need be accessible).
3Mount the reducing coupler (part 4 of this kit) in between the
pressure reducing valve and the expansion relief valve (part 2 of
this kit) using a length of copper tube Ø22 mm (to the pressure
reducing valve) and a length of copper tube Ø15 mm (to the
expansion relief valve).
4Pre-assemble the adaptor and expansion vessel (parts 8 and 5
of this kit) so that the expansion vessel is ready for installation.
5Remove the insulation piece to get acces to the factory fitted
temperature and pressure relief valve. Manually operate the
temperature and pressure relief valve to ensure free water flow
through discharge pipe. Turn knob left.
Water main in
6Fit the elbow/drain valve (part 7 of this kit) in the cold water
flexible hose coming out of the rear plate.
Pay attention to position the drain valve in such a way that 80%
of the domestic hot water tank can be drained.
7Position both, the pressure reducing valve with integrated non
return valve and line strainer and the expansion relief valve
(parts 1 and 2 of this kit - see also procedure step 2) as high as
possible and connect it to the water mains inlet.
The expansion relief valve must be installed with a horizontal
discharge. If fitted inverted, debris may be deposited on the seat
and cause fouling of the seat when the valve operates. Check
direction of flow arrows.
Fit a length of copper tube Ø22 mm (field supply) in between the
elbow/drain valve (procedure step 6) and the pressure reducing
valve.
Make sure to provide for a connection on this pipe to the
expansion vessel (part 5 of this kit).
8Fit a length of copper tube Ø22 mm (field supply) inbetween the
T-piece (part 9 of this kit) and the pre-assembled expansion
vessel (procedure steps 4 and 7).
Discharge
9Remove the front decoration panels of the domestic hot water
tank. Install the first tundish (part 6 of this kit) in a vertical
position within a maximum of 500 mm away from the
temperature and pressure relief valve. Use the foreseen space
inside the domestic hot water tank module as indicated in the
figure. Use tie-wraps to firmly fix the tundish.
10 Connect a metal discharge pipe Ø15 mm (field supply) from the
temperature and pressure relief valve to the tundish (≤500 mm).
11 Install the second tundish (part 6 of this kit) in a vertical position
within a maximum of 500 mm away from the expansion relief
valve.
12 Connect a metal discharge pipe Ø15 mm (field supply) from the
expansion relief valve to the tundish (≤500 mm).
13 Connect discharge pipes from both tundishes. Refer to
paragraph "Tundish pipework" on page 8.
All pipework must have a continuous fall and be fitted conform to
the requirements of the Building Regulation G3.
After completing the installation
14 After completing the installation, the installer has to fill in the
warning label on the tank with indelible ink. The warning label is
located on the lower front decoration panel inside.
NOTE To access the tundish connected to the
temperature and pressure relief valve, the front
decoration panels need to be removed.
Do not install any valves between the domestic hot
water tank and relief valves/expansion vessel.
Ø22 mm Ø15 mm
Do not remove
Contact the installer.
Should the system develop a fault, switc
contact the installer.
This installation is subject to building regulation approval,
notify Local Authority of intention to install.
Use only manufacturer's recommended spare parts.
Contact your local Daikin dealer.
Installed by
name
address
tel. No.
completion date

Installation manual
10 EKHTSU200+260AA + EKUHWHTA
Domestic hot water tank with UK kit for air to water heat pump system
4PW53247-1B
MAINTENANCE
In order to ensure optimal availability of the unit, a number of checks
and inspections on the unit and the field wiring have to be carried out
at regular intervals.
The described checks must be executed at least once a year by
qualified personnel.
1Checking for leaks
To be able to check for leaks, first remove the front decoration
panel of the indoor unit and then the front panels of the tank
module.
2Temperature and pressure relief valve
Check for correct operation of the temperature and pressure relief
valve. Remove the front decoration panels and insulation piece.
Manually operate the temperature and pressure relief valve to
ensure free water flow through the discharge pipe. Turn knob left.
3Pressure reducing valve with integrated non return valve and
line strainer
Depending on local water conditions, annual inspection of the
integral line strainer, pressure reducing valve cartridge and
seating may be necessary.
- Unscrew the retaining nut of the valve. The complete
operating mechanism, including the strainer can be removed.
- Clean the filter mesh and cartridge under running water.
- Replace the cartridge, ensuring that the strainer is correctly
located and reassemble the unit.
4Expansion relief valve
Check for correct operation of the expansion relief valve.
Manually operate the expansion relief valve to ensure free water
flow through discharge pipe.Turn knob left.
Depending on local water conditions, annual inspection of the
expansion relief valve cartridge and seating may be necessary.
- Unscrew the expansion relief headwork from valve body.
-Clean valve seat face and seating - do not scratch or damage
either seat face or seating.
- Refit in reverse order. Do not over tighten.
Descaling
Depending on the water quality and set temperature, scale can
deposit on the heat exchanger inside the domestic hot water tank
and can restrict heat transfer. For this reason, descaling of the heat
exchanger may be required at certain intervals.
Draining
Follow the next steps to drain the tank:
1Switch off the power supply.
2Turn off the cold water supply valve.
3Open the hot water taps.
4Open the drain valve.
TROUBLESHOOTING
This section provides useful information for diagnosing and
correcting certain troubles which may occur in the unit.
General guidelines
Before starting the trouble shooting procedure, carry out a thorough
visual inspection of the unit and look for obvious defects such as
loose connections or defective wiring.
When a safety device was activated, stop the unit and find out why
the safety device was activated before resetting it. Under no circum-
stances safety devices may be bridged or changed to a value other
than the factory setting. If the cause of the problem cannot be found,
call your local Daikin dealer.
General symptoms
Symptom 1: No water flow from hot taps
Symptom 2: Water from hot taps is cold
Symptom 3: Intermittent water discharge
■Each inspection has to be carried out by a licensed
technician and not by the user.
■Before carrying out any maintenance or repair activity,
always switch off the circuit breaker on the supply
panel, remove the fuses or open the protection
devices of the unit.
■Make sure that before starting any maintenance or
repair activity, also the power supply to the outdoor
unit is switched off.
When using means for descaling, it must be ensured that
the water quality remains compliant with the requirements
of EU directive 98/83/EC.
When carrying out an inspection on the supply panel or on
the switch box of the unit, always make sure that the circuit
breaker of the unit is switched off.
POSSIBLE CAUSES CORRECTIVE ACTION
The main water supply is off. Check that all shut off valves of the
water circuit are completely open.
The strainer is blocked. Turn off the water supply, remove
and clean the strainer (see
"Pressure reducing valve with
integrated non return valve and line
strainer" on page 10 on how to do
this).
The cold water inlet pressure
reducing valve is not fitted properly. Check and refit as required (see "Pressure reducing valve with
integrated non return valve and line
strainer" on page 10 on how to do
this).
POSSIBLE CAUSES CORRECTIVE ACTION
The thermal cut-out located in the
indoor unit has operated
•Check and find the cause of tripping
and then reset button.
•Check if thermistor is correctly
installed in thermistor socket.
Procedure: remove front panel and
insulation, replace or fix the sensor.
The indoor unit (EKHBRD) is not
operating. Check the indoor unit operation. Refer to the manual delivered with
the unit.
If any faults are suspected, contact
your local dealer.
POSSIBLE CAUSES CORRECTIVE ACTION
Thermal control failure (water will be
hot). Contact your local dealer.
The expansion vessel is broken. Replace the expansion vessel.

EKHTSU200+260AA + EKUHWHTA
Domestic hot water tank with UK kit for air to water heat pump system
4PW53247-1B
Installation manual
11
Symptom 4: Continuous water discharge
DIPOSAL REQUIREMENTS
Dismantling of the unit and treatment of parts must be done in
accordance with relevant local and national legislation.
TECHNICAL SPECIFICATIONS
Domestic hot water tank specifications
NOTES
POSSIBLE CAUSES CORRECTIVE ACTION
Cold water inlet pressure. Check the pressure reducing valve.
Replace the pressure reducing valve
if the measured pressure is >2.1 bar.
Temperature and pressure relief
valve. Check and reset button.
The expansion relief valve is not
functioning properly. Check for correct operation of the pressure relief valve by turning the
red knob on the valve counter
clockwise:
• If you do not hear a clacking
sound, contact your local dealer.
• In case the water keeps running
out of the unit, close both the
water inlet and outlet shut-off
valves first and then contact your
local dealer.
EKHTSU200AA EKHTSU260AA
• Storage capacity (l) 200 260
• Material Stainless steel Stainless steel
• Overall dimensions (h x l x w) (mm) 1335 x 600 x 695 1610 x 600 x 695
• Operating pressure (bar) 2.1 2.1
• Maximum primary working
pressure (heating side) (bar) 33
• Expansion vessel pre-charge
pressure (bar) 2.5 2.5
• Preset opening pressure of
expansion relief valve (bar) 88
• Preset opening temperature of
temperature and pressure
relief valve
(°C) 90~95 90~95
• Set opening pressure of
temperature and pressure
relief valve
(bar) 10 10
• Connections Quick coupling/
G3/4” F Quick coupling/ G3/4” F
• Inspection access type G1/2” M
Recirculation
connection
G1/2” M
Recirculation
connection
• Weight
- empty (kg) 70 78
- when full (kg) 265 330
• Mounting On top of
EKHBRD or floor
mounted
On top of
EKHBRD or floor
mounted
• Maximum water supply
pressure (bar) 88
• Supply temperature time(a)
(a) The time it takes to increase the temperature from 15°C to 60°C
- EKHBRD011 (min) 60 70
- EKHBRD014 (min) 50 60
- EKHBRD016 (min) 40 50
• Re-heat time(b)
(b) The time it takes to increase 70% of the contents of the vessel back up to 60°C
- EKHBRD011 (min) 50 60
- EKHBRD014 (min) 40 50
- EKHBRD016 (min) 30 40

4PW53247-1B
Copyright © Daikin