Daikin EKHWS050B3VJU, EKHWS080B3VJU Installation Manual

INSTALLATION MANUAL

Domestic hot water tank for air to water heat

pump system

EKHWS050B3VJU
EKHWS080B3VJU

Installation manual

Domestic hot water tank for air to water heat pump system

Manuel d'installation

Ballon d'eau chaude domestique pour

système de pompe à chaleur air/eau

Manual de instalación

Depósito de agua caliente sanitaria para

instalaciones con bomba de calor aire-agua

English

Français

Español

12 3 54

1

1x 1x 2x 4x 1x

1

2

73°

3.9 inch

(100 m

6

1x

+

m

)

11.8 inch

(300 mm)

H1

H4

H2

H3

105°

45°

30°

5°

15°

15.7 inch

(400 mm)

62°

8

3/4" FBSP

1

9

2

6

3/4" FBSP

3

1/2" FBSP

7

3/4" FBSP

4

3/4" FBSP

5

0

2

8.7 inch
(220 mm)

(0~40 mm)

4.3 inch

0~1.6 inch

(110 mm)

9

Ø22.8 inch

(580 mm)

Domestic hot water tank

for air to water heat pump system

age

P

C

ONTENTS

EKHWS050B3VJU
EKHWS080B3VJU

Introduction........................................................................................ 1

General information ...................................................................................1

Scope of this manual .................................................................................1

Model identification ....................................................................................1

Accessories .......................................................................................1

Accessories supplied with the domestic hot water tank............................. 1

Safety considerations ........................................................................2

Installation of the EKHWS domestic hot water tank ..........................3

Main components....................................................................................... 4

Outlook diagram......................................................................................... 5

Installation guidelines................................................................................. 5

Installing the domestic hot water tank........................................................ 5

Connecting the water circuits..................................................................... 5

Field wiring................................................................................................. 7

Maintenance......................................................................................8

Troubleshooting .................................................................................9

General guidelines.....................................................................................9

General symptoms..................................................................................... 9

Technical specifications.....................................................................9

Domestic hot water tank specifications...................................................... 9

READ THESE INSTRUCTIONS CAREFULLY BEFORE
INSTALLATION. KEEP THIS MANUAL IN A HANDY
PLACE FOR FUTURE REFERENCE.

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.

ALL ACTIVITIES DESCRIBED IN THIS MANUAL SHALL
BE CARRIED OUT BY A LICENSED TECHNICIAN.

BE SURE TO WEAR ADEQUATE PERSONEL PROTEC­TION EQUIPMENT (PROTECTION GLOVES, SAFETY
GLASSES, ...) WHEN PERFORMING INSTALLATION,
MAINTENANCE OR SERVICE TO THE UNIT.

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 39°F~95°F (4°C~35°C).

The English text is the original instruction. Other languages are
translations of the original instructions.

Installation manual

NTRODUCTION

I

General information

The EKHWS domestic hot water tank with integrated 3 kW electrical
booster heater can be connected to the indoor unit. The domestic hot
water tank is available in 2 sizes: 50 and 80 gallons (200 and
300 litre). These domestic hot water tanks are floor standing models.

Scope of this manual

This installation manual describes the procedure for unpacking,
installing and connecting the EKHWS domestic hot water tank.

Model identification

EK HWS 050 B 3 VJU

Booster heater voltage
VJU = 1P, 208/230 V

Capacity booster heater: 3 kW

Series

Indication of storage capacity in gallons

Hot Water tank Stainless steel

Kit

CCESSORIES

A

Accessories supplied with the domestic hot water tank

See figure 1

1

Thermistor + connection wire (39.4 ft) (=12 m)

2

Contactor - circuit breaker assembly

3

Contactor fixing screw

4

Tapping screw

5

Installation manual

6

3-way valve + motor

EKHWS050+080B3VJU

Domestic hot water tank for air to water heat pump system

4PW56114-1

Installation manual

1

S

AFETY CONSIDERATIONS

The precautions listed here are divided into the following four types.
They all cover very important topics, so be sure to follow them
carefully.

Meanings of

DANGER, WARNING, CAUTION

DANGER

Indicates an imminently hazardous situation which, if not
avoided, will result in death or serious injury.

WARNING

Indicates a potentially hazardous situation which, if not
avoided, could result in death or serious injury.

CAUTION

Indicates a potentially hazardous situation which, if not
avoided, may result in minor or moderate injury. It may also
be used to alert against unsafe practices.

NOTE

Indicates situations that may result in equipment or
property-damage accidents only.

and

NOTE

symbols.

Danger

■

Before touching electric terminal parts, turn off power switch.

■

When service panels are removed, live parts can be easily
touched by accident.

Never leave the unit unattended during installation or servicing
when the service panel is removed.

■

Do not touch water pipes during and immediately after operation
as the pipes may be hot. Your hand may suffer burns. To avoid
injury, give the piping time to return to normal temperature or be
sure to wear proper gloves.

■

Do not touch any switch with wet fingers. Touching a switch with
wet fingers can cause electrical shock.

■

Before touching electrical parts, turn off all applicable power
supply.

Warning

■

Tear apart and throw away plastic packaging bags so that
children will not play with them.

Children playing with plastic bags face danger of death by
suffocation.

■

Safely dispose of packing materials. Packing materials, such as
nails and other metal or wooden parts, may cause stabs or other
injuries.

■

Be aware that the domestic hot water temperature can/will be
higher than the user set point for domestic hot water depending
on the selected values of certain field settings (example 2).
Refer to the field settings in the installation manual of the indoor
unit EKHBH/X or outdoor unit EBLQ, EBHQ, EDLQ, EDHQ.

If this high domestic hot water temperature can be a potential
risk for human injuries, a mixing valve (field supply) shall be
installed at the hot water outlet connection of the domestic hot
water tank. This mixing valve shall secure that the hot water
temperature at the hot water tap never rise above a set
maximum value. This maximum allowable hot water temperature
shall be selected according to local laws and regulations.

Caution

■

Ground the unit.
Grounding resistance should be according to local laws and

regulations.
Do not connect the ground wire to gas or water pipes,

lightning conductor or telephone ground wire.
Incomplete grounding may cause electric shocks.

■

Gas pipe.
Ignition or explosion may occur if the gas leaks.

■

Water pipe.
Hard vinyl tubes are not effective grounds.

■

Lightning conductor or telephone ground wire.
Electric potential may rise abnormally if struck by a lightning
bolt.

■

Install the power wire at least 3.28 ft (1 meter) away from
televisions or radios to prevent image interference or noise.

(Depending on the radio waves, a distance of 3.28 ft (1 meter)
may not be sufficient to eliminate the noise.)

■

Do not rinse the unit. This may cause electric shocks or fire.

■

Do not install the unit in places such as the following:

■

Where there is mist of mineral oil, oil spray or vapour.
Plastic parts may deteriorate, and cause them to fall out or
water to leak.

■

Where corrosive gas, such as sulphurous acid gas, is
produced.
Corrosion of copper pipes or soldered parts may cause the
refrigerant to leak.

■

Where there is machinery which emits electromagnetic
waves.
Electromagnetic waves may disturb the control system, and
cause malfunction of the equipment.

■

Where flammable gases may leak, where carbon fibre or
ignitable dust is suspended in the air or where volatile
flammables, such as thinner or gasoline, are handled.
Such gases may cause a fire.

■

Where the air contains high levels of salt.

■

Where voltage fluctuates a lot, such as that in factories.

■

In vehicles or vessels.

■

Where acidic or alkaline vapour is present.

Installation manual

2

Domestic hot water tank for air to water heat pump system

EKHWS050+080B3VJU

4PW56114-1

I

NSTALLATION OF THE

WATER TANK

CAUTION

■

The total system (indoor and outdoor unit) is designed
for combination with a domestic hot water tank. In
case another tank is being used in combination with
the 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.

■

The equipment is not intended for use in a potentially
explosive atmosphere.

■

Only this tank can be used in combination with the
solar kit option (EKSOLHW*).

■

Domestic hot water quality must be according to "Safe
Drinking water Act (42 U.S.C. 300f)".

■

Do not connect to any heating system or component
previously used with a non potable water heating
appliance.

■

Do not introduce toxic chemicals, such as used for
boiler treatment, into the system.

■

Fill system only with water (EKHBH, EKHBX, EDLQ,
EBLQ) or water with propylene glycol and inhibitor
(only for EDLQ, EBLQ), having a toxicity rating or
Class of 1, as listed in Clinical Toxicology of
Commercial products, 5th edition.

■

If glycol is used, limit the pressure in the system to
30 psi (2.07 bar) by means of an approved pressure
relief valve. Refer to the figure in "Safety devices" on
page 4.

■

It is not allowed to add ethylene glycol to the water
circuit. Adding ethylene glycol might lead to
contamination of the domestic water if a leakage
would occur in the heat exchanger coil.

EKHWS

DOMESTIC HOT

CAUTION

In case of limited consumption of domestic hot water, e.g.
at holiday residences or at houses that are occasionally
not occupied, the domestic hot water tank installation must
be fitted with a shunt pump.

■

The shunt pump can be time-controlled,

■

the shunt pump must operate to circulate the
complete volume of the domestic hot water tank 1.5
times per hour,

■

and the shunt pump must operate, or be programmed
for operation, during 2 uninterrupted hours per day at
least.

2

3

1 Cold water

connection

2 Hot water connection
3 Shunt pump

(field supply)

4 Non-return valve

(field supply)

1

4

In case of very long field water piping between the domestic hot
water tank and the hot water end point (shower, bath, etc.) it can take
more time before the hot water from the domestic hot water tank
reaches the hot water end point.

1 Shower

1

2

2 Recirculation pump

If required connect a recirculation pump in between the hot water end
point and the recirculation hole in the domestic hot water tank.

NOTE

■

A drain device should be installed on the cold water
connection on the domestic hot water tank.

■

It is important that the storage capacity of the
domestic hot water tank meets normal daily
fluctuations in consumption of domestic hot water
without any fall of the water outlet temperature during
use.

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.

EKHWS050+080B3VJU

Domestic hot water tank for air to water heat pump system

4PW56114-1

Installation manual

3

Main components

1 Pressure relief valve

14

5

15

6
7

8

9

F

10

13

NOTE

■

T-piece (field supply)(1) is only necessary if a
pressure relief valve is required on the hot water
side and the temperature and pressure relief

2

1

H

3

4

valve connection (14) is already used for a
temperature and pressure relief valve.

■

Temperature and pressure relief valve connection
(14) shall be used in case a temperature and
pressure relief valve (field supply) is required
according to local laws and regulations.

Safety devices

CAUTION

■

The domestic hot water tank relief valve connections
may not be used for other purpose.

■

Do not install heaters without thermal cut-outs.

■

15

16

Thermal protector — The booster heater in the domestic hot
water tank 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 domestic
hot water tank by pressing the red button (for access, remove
the electrical box lid).

CAUTION

The electrical box lid must only be opened by a
licensed electrician.

Switch off the power supply before opening the
electrical box lid.

11

R

12

C

1

Field supply

2

Hot water connection (H)

3

Pressure relief valve connection

4

Pressure relief valve (field supply)

5

Electrical box

6

Electrical box lid

7

Recirculation hole

8

Thermistor socket

9

Flow inlet connection (F) (from the main unit)

10

Heat exchanger coil

11

Return outlet connection (R) (to the main unit)

12

Cold water connection (C)

13

Threaded thermistor hole for use with the solar kit option. Refer to
the installation manual EKSOLHW*.

14

Temperature and pressure relief valve connection

15

Thermal protectors (Q2L, Q3L)

16

Booster heater

■

Pressure relief valve — A pressure relief valve (field supply) in
accordance with relevant local laws and regulations, and with an
opening pressure of maximum 145 psi (10 bar) must be
connected to the pressure relief valve connection.

■

If a discharge pipe is connected to the pressure relief device it
must be installed in a continuously downward direction and in a
frost-free environment. It must be left open to the atmosphere.

■

If glycol is used, an approved pressure relief valve with an
opening pressure of maximum 30 psi (2.07 bar) (field supply)
must be installed in the inlet of the tank as shown in the figure
below.

1

Flow direction

Installation manual

4

Domestic hot water tank for air to water heat pump system

EKHWS050+080B3VJU

4PW56114-1

Outlook diagram

Installing the domestic hot water tank

Outlook diagram, see figure 2.

1

Hot water and pressure relief valve connection

2

Recirculation hole

3

Flow inlet connection (from the main unit)

4

Return outlet connection (to the main unit)

5

Cold water connection

6

Thermistor socket

7

Threaded thermistor hole for use with solar kit option. See
Installation manual EKSOLHW*.

8

Temperature and pressure relief valve connection

9

Remove the protection tape from the domestic hot water
tank

Domestic hot water tank model H1 H2 H3 H4

EKHWS050B3VJU

EKHWS080B3VJU

(inch) 45.3 24.8 7.9 32.7
(mm) 1150 630 200 830
(inch) 63.0 24.8 7.9 32.7
(mm) 1600 630 200 830

Installation guidelines

Keep in mind the following guidelines when installing the domestic
hot water tank:

■

The installation location is frost-free.

■

Make sure to make the piping in size 1" or more (and reduce to
3/4" at the inlet of the tank) as to have sufficient water volume in
the piping between unit and domestic hot water tank.

■

Locate the domestic hot water tank in a suitable position to
facilitate ease of maintenance; remember access is required to
the electrical box. Refer to the grey-coloured zones indicated in
figure 2.

■

Provide a connection for the pressure relief valve blow-off and
drain.

■

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 laws and regulations.

■

Ta ke care that in the event of a leak, water can not cause any
damage to the installation space and surroundings.

1

Check if all domestic hot water tank accessories (see
"Accessories" on page 1) are enclosed.

2

Place the domestic hot water tank on a level surface.

3

Remove the protection tape from the domestic hot water tank
(See (8) in figure 2).

4

Apply thermal paste to the thermistor and insert the thermistor
as deep as possible in the thermistor socket. Fix using the nut
provided.

Connecting the water circuits

Refer to the chapter "Typical application examples" described in the
installation manual delivered with the indoor unit for details on
connecting the water circuits and the motorised 3-way valve.

EKHWS050+080B3VJU

Domestic hot water tank for air to water heat pump system

4PW56114-1

Connecting the 3-way valve

1

Refer to the figure below before making the connection. Values
between brackets are the conversion from inch to mm.

1.73

1.73

Installation manual

3.03 (77)

14.37 (111)

0.51
(13)

1.50
(38)

2.64
(67)

(44)

(44)

5

2

Installation position.
It is advised to connect the 3-way valve as close as possible to

the unit. It can be installed in accordance with one of the
following four configurations.

1

1

2

NOTE

If the valve is not positioned in this way before mount­ing the motor, the valve will give way to both domestic
water and room heating during operation.

5

When installing in accordance with figure A or figure D, open the
valve motor cover by loosening the screw and change the
jumper so as to change the rotation direction of the valve.

By default the jumper is factory set to apply for installation in
accordance with figure B and figure C.

3

Installation in accordance with

figure A and figure D

Installation in accordance with

figure B and figure C

3

figure A figure B

1

2

3

figure C figure D

1

From indoor unit

2

To domestic hot water tank

3

To room heating

3

Unpack the 3-way valve body and 3-way valve motor.
Ver ify that following accessories are provided with the motor.

2

1

Sleeve

2

Valve motor cover

3

Screw

4 Scale

1

3

1

3

2

4

2

DIR

2P

Y

N

L

Rotation direction of the valve

6

Push the motor on the motor sleeve.
Make sure not to rotate the sleeve during this action, so as to

maintain the valve position as set during step 4.

7

8

Put the scale on the valve as shown below.

Domestic hot

water tank Room heating Room heating

Installation in accordance with

figure B and figure C

9

Make sure to firmly fix the power supply cord onto the 3-way

Installation in accordance with

valve body with a field supplied cable tie like in illustration below.

Domestic hot

water tank

figure A and figure D

4

Install the 3-way valve body in the pipework.

• Make sure the shaft will be positioned in such a way that the
motor can be mounted and replaced.

• Put the sleeve on the valve and turn the valve to the middle
position of the scale plate.
Check that the valve is positioned as in the figure below. It shall
be blocking the outlet connection to the domestic hot water for
50% and the outlet connection to the room heating also for
50%.

Installation in accordance with

figure A and figure B

Installation manual

Installation in accordance with

figure C and figure D

6

10

Perform the wiring in the unit in accordance with the following
figure:

8910

3-way valve

BRN

BLU

BLK

LNY

Refer also to the drawing on page 8.

11

Connect the water inlet and water outlet.

12

Connect the hot and cold water supply tubes.

Domestic hot water tank for air to water heat pump system

EKHWS050+080B3VJU

4PW56114-1

13 Connect the pressure relief valve (field supply, opening pressure

maximum 145 psi (10 bar)) and drain.

CAUTION

If a discharge pipe is connected to the pressure relief
device it must be installed in a continuously downward
direction and in a frost-free environment. It must be left
open to the atmosphere.

2 Make sure to ensure strain relief of the cable by correct use of

the PG nipple and PG nut (mounted on the domestic hot water
tank).

Field wiring

CAUTION

■ A main switch or other means for disconnection,
having a contact separation in all poles, must be
incorporated in the fixed wiring in accordance with
relevant local laws and regulations.

■ All field wiring and components must be installed by a
licensed electrician and must comply with relevant
local laws and regulations.

■ The field wiring must be carried out in accordance
with the wiring diagram supplied with the unit and the
instructions given below.

■ The domestic hot water tank must be grounded via
the indoor unit.

■ Be sure to use a dedicated power supply. Never use a
power supply shared by another appliance.

■ Make sure all field wiring is insulated from the tank
body and heater element or can resist temperatures
to 194°F (90°C).

■ Select the power cable in accordance with relevant
local laws and regulations.

■ Be sure to install the required fuse or circuit breaker.

For cable requirements and specifications, refer to "Field wiring" in
the indoor unit installation manual supplied with the EKHBX unit.

Thermistor cable

The distance between the thermistor cable and power supply cable
must always be at least 2 inch (5 cm) to prevent electromagnetic
interference on the thermistor cable.

DANGER

Switch off all relevant power supply (outdoor unit, backup
heater, booster heater) before changing the connector.

Connections to be made in the domestic hot water tank
electrical box

1 Refer to the wiring diagram sticker in the domestic hot water

tank switch box.

4
3
2
1

Cable entry:

1 Power supply booster heater (X6M)
2 Power supply to EKSOLHW* pump (X8M, grounding, 1-2)
3 Power supply from EKHBH/X or EBLQ, EBHQ, EDLQ, EDHQ

for EKSOLHW* (X8M, grounding, 1-2)

4 Thermal protector (Q3L, 3-4)

The power supply cable towards the booster heater
X4M→X6M and the cable towards the thermal protector
X2M (13-14)→Q3L (4-3) are separated. However, if
allowed according to local laws and regulations, these 2
cables can be combined in 1 cable (5 wires).

Connections to be made in the indoor unit switch box
3 Mount the prewired contactor (K3M), circuit breaker (F2B) and

terminal blocks (X3M, X4M). The contactor must be fixed with
the 2 supplied contactor screws and the terminal blocks must be
fixed with the 2x 2 supplied tapping screws.

4 Plug the connector connected to the contactor K3M in the

socket X13A on the PCB.

5 Plug the thermistor cable connector in the socket X9A on the

PCB.

6 Connect the prewired ground wires of the terminal block X3M

and X4M to the grounding screw.

7 Connect the booster heater power supply and thermal protection

cable (field supply) to terminal X4M ground, 1, 2, and X2M 13,

14.

8 Connect the booster heater power supply cable to the terminal

block X3M.

9 Fix the cables to the cable tie mountings with cable ties to

ensure strain relief.

10 Set DIP switch SS2-2 on the PCB to ON.
11 When routing out cables, make sure that these do not obstruct

mounting of the indoor unit cover.

EKHWS050+080B3VJU

Domestic hot water tank for air to water heat pump system

4PW56114-1

Installation manual

7

Note: only relevant field wiring and not all implemented parts are

A11P

K3M

F2B

X2M

X9A

X3M

X4M

shown.

■ For EXHBH/X units only

■ For EDH, EBH, EDL, EBL units only

X8M

TR1

K1M K2M

TR2

X9A

A1P

X13A

A4P

X2M X4M

K5M

K3M K6M

F2B F3B F1B

K3M

K3M

BRN

L

N Y

X2M

LNY

M3S

BLU

98

BLK

10

X13A

A11P

A11P

X9A

X9A

X2M

X2M

(>50 mm)

X4M

X4M

X3M

X3M

L1 L2

VJU

208/230 V AC

3 kW

X4M

X6M

F2B

F2B

X2M

2

2

4 3
Q3L

The power supply cable towards the booster heater
X4M→X6M and the cable towards the thermal protector
X2M (13-14)→Q3L (4-3) are separated. However, if
allowed according to local laws and regulations, these 2
cables can be combined in 1 cable (5 wires).

>2 inch

>2 inch

(>50 mm)

BRN

L

X2M

LNY

BLU

BLK

N Y

10

98

M3S

X1M

X2M

4

Q3L

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

X3M

X3M

X4M

2

L1 L2

VJU

208/230 V AC

3 kW

2

3

X6M

at regular intervals.

CAUTION

■ Before carrying out any maintenance or repair activity,
always switch off the circuit breaker on the supply
panel, remove the fuses or open the circuit breaker,
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.

The described checks must be executed at least once a year.
1 Domestic hot water tank pressure relief valve (field supply)

and/or temperature and pressure relief valve (field supply)
Check for correct operation of the pressure relief valve and/or

temperature and pressure relief valve on the domestic hot water
tank.

2 Domestic hot water tank booster heater

It is advisable to remove lime buildup on the booster heater to
extend its life span, especially in regions with hard water. To do
so, drain the domestic hot water tank, remove the booster heater
from the domestic hot water tank and immerse in a bucket (or
similar) with lime-removing product for 24 hours.

Installation manual

8

Domestic hot water tank for air to water heat pump system

EKHWS050+080B3VJU

4PW56114-1