Daikin EHVH04SU18CB6W, Operation Manuals

3 Operation

Operation manual

5

EHVH04~26CB6W
Daikin Altherma – Low temperature split
4P449982-1 – 2016.06

3.4

Domestic hot water control

CAUTION

Only for EHVH_SU_CB6W models.

When  using  the  domestic  hot  water  tank  to  produce  hot
water,  do  NOT  turn  OFF  the  heat  pump. 

Reason:

  the

electrical  backup  heater  from  the  space  heating  circuit  is
used during disinfection of the domestic hot water tank.

3.4.1

Reheat mode

In  reheat  mode  ( ),the  DHW  tank  continuously  heats  up  to  the
temperature  shown  on  the  DHW  tank  temperature  home  page
(example: 50°C).

t

60°C

00:00

07:00

50°C

15°C

40°C

14:00

21:00

1

2

3

4

Tt

T

t

DHW tank temperature

t

Time

INFORMATION

There is a risk of space heating capacity shortage/comfort
problem (in case of frequent domestic hot water operation,
frequent  and  long  space  heating  interruption  will  happen)
when  selecting  [6‑0D]=0  ([A.4.1]  Domestic  hot  water
Type=Reheat only).

INFORMATION

When  the  DHW  tank  mode  is  reheat,  the  risk  for  capacity
shortage  and  comfort  problem  is  significant.  In  case  of
frequent  reheat  operation,  space  heating  function  is
regularly interrupted.

3.4.2

Scheduled mode

In  scheduled  mode  ( ),  the  DHW  tank  produces  hot  water
corresponding  to  a  schedule.  The  best  time  to  allow  the  tank  to
produce hot water is at night, because the space heating demand is
lower.

Example: 

t

60°C

00:00

07:00

50°C

15°C

40°C

14:00

21:00

1

2

3

4

5

Tt

T

t

DHW tank temperature

t

Time

3.4.3

Sch reheat mode

In sch reheat mode (   ), the domestic hot water control is
the  same  as  in  scheduled  mode.  However,  when  the  DHW  tank
temperature drops below a preset value (=reheat tank temperature –
hysteresis  value;  example:  35°C),  the  DHW  tank  heats  up  until  it
reaches  the  reheat  set  point  (example:  45°C).  This  ensures  that  a
minimum amount of hot water is available at all times.

Example: 

t

Tt

60°C

00:00

07:00

50°C

45°C

15°C

14:00

21:00

35°C

1

2

4

5

3

T

t

DHW tank temperature

t

Time

60°C

Storage comfort

50°C

Storage eco

45°C

Reheat

35°C

Reheat tank temperature – hysteresis value

3.4.4

Using the DHW tank temperature home
page

Typical DHW tank temperature home pages

Depending on the user profile, the user interface gives you either a
basic  or  a  detailed  home  page.  The  examples  in  the  illustrations
below are in DHW tank mode = Scheduled.

User profile = Basic

User profile = Detailed

15:20

60°C

Storage comfort

Tank

Mon

15:20

60°C

00:00

Mon

Tue

Tank

Storage comfort

To read out and adjust the desired reheat temperature (in
scheduled and reheat mode)

1

Go  to  [7.4.3.3]: 

  >  User  settings  >  Preset  values  >  Tank

temperature > Reheat.

Result: 

You can read out the desired reheat temperature.

2

Press 

 or 

 to adjust.

To read out and overrule the active or next scheduled desired
temperature (in scheduled mode or sch reheat mode)

1

Go to the DHW tank temperature home page (Tank).

Result: 

60°C

 is displayed.

2

Press 

 or 

 to overrule. 

Note: 

If the desired temperature is

weather dependent, you cannot change it on the home page.

3.4.5

Using the DHW tank booster mode

To activate the DHW tank booster mode (user profile = Basic)

1

Go to the DHW tank temperature home page (Tank).

2

Press 

 for more than 5 seconds.

To activate the DHW tank booster mode (user profile = Detailed)

1

Go to the DHW tank temperature home page (Tank).

2

Press 

 to select  .