EKHBH/X016BB
Indoor unit for air to water heat pump system
4PW62572-1A – 01.2011
Installation manual
30
■
[5-02] Space heating priority status: specifies whether space
heating priority is enabled (1) or disabled (0).
■
[5-03]
Space heating priority temperature: outdoor
temperature below which the domestic hot water will be
heated by the booster heater only, i.e. low outdoor
temperature.
■
[5-04] Set point correction for domestic hot water
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
Domestic hot water set point temperature
T
U
User set point (as set on the user interface)
T
A
Ambient (outdoor) temperature
Space heating priority
Equilibrium temperature (only for EKHTS)
The 'equilibrium temperature' field settings apply to operation of the
backup heater
during space heating.
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. This function reduces the working time of
the backup heater.
■
[5-00] Equilibrium temperature status: the equilibrium
temperature function is enabled (1) (this field setting is fixed
and can not be modified).
■
[5-01] Equilibrium temperature: outdoor temperature below
which operation of the backup heater is allowed.
Space heating priority temperature (only for EKHTS)
Applies only to installations with a domestic hot water tank
(1)
. The
domestic water is heated by heat pump and backup heater. The
'space heating priority temperature' field settings apply to operation
of the 3-way valve and the
backup heater
during domestic hot water
operation.
When the space heating priority function is enabled, it is assured that
the full capacity of the heat pump is used as much as possible for
space heating when the outdoor temperature equals or drops below
the specified space heating priority temperature, i.e. low outdoor
temperature. This is done by allowing the backup heater to assist
during domestic hot water heating. This means the heating up time of
domestic water heating will be kept to a minimum and as much as
possible capacity of the heat pump is used for space heating.
■
[5-02] Space heating priority temperature: outdoor
temperature below which the domestic water heat up time is
reduced to a minimum, as the backup heater will additionally
assist during low domestic hot water tank temperature
situations (this field setting is fixed and can not be modified).
■
[5-03] Space heating priority temperature: outdoor
temperature below which the backup heater is allowed to
assist during domestic hot water heating. This means the
heating up time of domestic water heating will be kept to a
minimum and as much as possible capacity of the heat pump
is used for space heating.
INFORMATION
If the booster heater operation is limited ([4-03]=0)
and the ambient temperature T
A
is lower than the field
setting to which parameter [5-03] is set and [5-02]=1,
then the domestic hot water will not be heated.
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
U
). Refer to field setting [5-03], [7-00] and the
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.
T
A
T
set
T
U
[5-03]
[5-04]
(1) Only applicable for tank without electrical booster heater (EKHTS).
NOTICE
[5-01] Equilibrium temperature and [5-03] Space
heating priority temperature are field settings that are
related to backup heater. So it is obliged to set [5-01]
and [5-03] to the same setting value.
INFORMATION
If the backup heater operation is limited ([4-00]=0) and
the ambient temperature T
A
is lower than the field
setting to which parameter [5-03] is set, then the
domestic hot water will not be heated with the backup
heater.
