Daikin EKHBX008BB3V3S Installation Manual page 33

CAUTION
For optional domestic hot water tank EKHTS, the
field setting [4-03] shall be 5.
[4-03]=5, this setting is automatically selected if the
EKHTS tank is connected and SS2-2 is set to ON.
[4-03]=5 activate the applicable logic and field
settings for EKHTS.
INFORMATION
■
Make sure that the domestic hot water set point is
according to your requirements.
Start with a low domestic hot water set point, and only
increase if you feel that the domestic hot water supply
temperature is not sufficient for your requirements
(this depends on your water using pattern).
■
Make sure the domestic water is not heated
unnecessary.
Space heating off temperature
■ [4-02] Space heating off temperature: outdoor temperature
above which space heating is turned off to avoid overheating.
■ [4-06] Backup heater emergency operation: defines whether
backup heater is allowed (1) or not allowed (0) during
emergency operation.
Emergency operation will startup backup heater operation
during certain outdoor malfunctions.
■ [4-07] Backup heater second step: defines whether backup
heater second step is allowed (1) or not allowed (0).
In this way it is possible to limit the backup heater capacity.
INFORMATION
Only for EKHTS: If the storage temperature set point
is higher than 50°C, Daikin advises not to disable the
backup heater second step because it will have a big
impact on the required time for the unit to heat up the
domestic hot water tank.
[5] Equilibrium temperature
(1)
temperature
Equilibrium temperature (only for EKHW*)
The 'equilibrium temperature' field settings apply to operation of the
backup heater.
When the equilibrium temperature function is enabled, operation of
the backup heater is restricted to low outdoor temperatures, i.e. when
the outdoor temperature equals or drops below the specified
equilibrium temperature. When the function is disabled, operation of
the backup heater is possible at all outdoor temperatures. Enabling
this function reduces the working time of the backup heater.
■ [5-00] Equilibrium temperature status: specifies whether the
equilibrium temperature
disabled (0).
■ [5-01] Equilibrium temperature: outdoor temperature below
which operation of the backup heater is allowed.
Space heating priority temperature (only for EKHW*)
Applies only to installations with a domestic hot water tank
'space heating priority temperature' field settings apply to operation
of the 3-way valve and the booster heater in the domestic hot water
tank.
When the space heating priority function is enabled, it is assured that
the full capacity of the heat pump is used for space heating only when
the outdoor temperature equals or drops below the specified space
heating priority temperature, i.e. low outdoor temperature. In this
case the domestic hot water will only be heated by the booster
heater.
(1) When the unit is configured for restricted power supply condition mode,
see "Appendix" on page 50.
(2) Only applicable for tank with built-in electrical booster heater (EKHW*).
EKHBX008BB3V3S
Indoor unit for air to water heat pump system
4PW62597-1 – 10.2010
and space heating priority
function is enabled (1)
(2)
■ [5-02] Space heating priority status: specifies whether space
heating priority is enabled (1) or disabled (0).
■ [5-03] Space
temperature below which the domestic hot water will be
heated by the booster heater only, i.e. low outdoor
temperature.
INFORMATION
If the booster heater operation is limited ([4-03]=0)
and the ambient temperature T
setting to which parameter [5-03] is set and [5-02]=1,
then the domestic hot water will not be heated.
■ [5-04]
Set
temperature: set point correction for the desired domestic hot
water temperature, to be applied at low outdoor temperature
when space heating priority is enabled. The corrected
(higher) set point will make sure that the total heat capacity of
the water in the tank remains approximately unchanged, by
compensating for the colder bottom water layer of the tank
(because the heat exchanger coil is not operational) with a
warmer top layer.
T
set
T
U
T
set
T
U
T
A
WARNING
Be aware that the domestic hot water temperature will be
automatically increased with the value selected in field
setting [5-04] (if the outdoor temperature drops below field
setting [5-03]) compare to the user set point for domestic
hot water (T
operation manual to select preferable set point.
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 the applicable legislation.
or
. The
heating priority temperature:
is lower than the field
A
point correction for domestic
[5-04]
[5-03]
Domestic hot water set point temperature
User set point (as set on the user interface)
Ambient (outdoor) temperature
Space heating priority
). Refer to field setting [5-03], [7-00] and the
U
outdoor
hot water
T
A
Installation manual
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