EKCBX/H008BBV3
Unit for air to water heat pump system
4PW66983-1C – 08.2011
Installation manual
27
■
[4-03]=4, then booster heater operation is the same as
setting 2, except that the domestic water heating (heat pump
and booster) will operate according to the scheduled storage
and reheat function. See field settings
■
[4-02] Space heating off temperature: outdoor temperature
above which space heating is turned off, to avoid
overheating.
■
[4-04]
Freeze
protection
function: avoids freezing of the
water piping between home and unit. In case of low ambient
temperatures it will activate the pump and in case of low
water temperatures it will additionally activate the backup
heater (if installed).
Default freeze protection function takes into account freezing
of water piping which is insufficiently insulated.
Basically it means that the pump is activated whenever
ambient temperatures become close to freezing,
independently of the working temperature.
■
Only if EKMBUH is installed
[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.
■
Only if EKMBUH is installed
[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.
[5] Equilibrium temperature and space heating priority
temperature
Equilibrium temperature
— 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 function is enabled (1) or
disabled (0).
■
[5-01] Equilibrium temperature: outdoor temperature below
which operation of the backup heater is allowed.
Space heating priority temperature
—
Applies only to installations
with a domestic hot water tank.
—
The '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.
■
[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.
CAUTION
For optional domestic hot water tank, the field
setting [4-03] shall be 0, 1, 2, 3, or 4.
INFORMATION
■
[4-03]=3 (default), this setting is automatically
selected if the correct and complete wiring
connections between indoor unit and switch
box of the optional domestic hot water tank
are done BEFORE SS2-2 is set to ON.
[4-03]=0~4 activate the applicable logic and
field settings for EKHW*.
■
[4-03]=5, this setting is automatically selected
in case there is incorrect field wiring between
indoor unit and switch box of the optional
domestic hot water tank (for example when
booster heater is not connected). The
required corrective action is described in
"Symptom 9: Field setting [4-03] and relation
to possible wrong tank temperatures" on
page 42
INFORMATION
If the booster heater operation is limited ([4-03]=0)
and the ambient outdoor 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.
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
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]
