Daikin HXHD125A7V1B Installation Manual page 32

[9] Automatic temperature compensation
If needed, it is possible to adjust some thermistor value of the unit by
a correction value. This can be used as countermeasure for
thermistor tolerances or capacity shortage.
The compensated temperature (= measured temperature plus
compensation value) is then used for controlling the system and will
be displayed in the temperature read-out mode.
■
[9-00] Leaving water temperature compensation value for
heating operation.
■
[9-01] Domestic hot water tank compensation value.
■
[9-02] Thermo ON/OFF admission
By changing this value the operation range for space heating
operation can be modified.
If the ambient temperature becomes higher than (24°C + the
value of [9-02]) no space heating is possible.
Space heating can be requested as long as the ambient
temperature is lower than (20°C + the value of [9-02]).
Example:
[9-02]=–2°C
T
A No space heating operation possible
B Request for space heating possible
C Hysteresis area
T Ambient temperature
■
[9-03] Setting not available
■
[9-04] Setting not available.
[A] Option setup
■
[A-00] Current limitation.
This setting provides the possibility to limit the power
consumption of the indoor unit as follows:
■ [A-00]=0 16.5 A (default)
■ [A-00]=1 13.2 A (±80%)
■ [A-00]=2 10.7 A (±65%)
The indoor unit current is limited, the outdoor unit is slave and
will also reduce its power consumption consequently (if other
indoor units loads correspond). However, transient conditions
with higher power consumption are possible.
■
[A-01] Setting not available
■
[A-02] Temperature difference for leaving and returning water in
heating mode.
The unit is designed to support radiator operation. The advised
leaving water temperature (set by the remote controller) for
radiators is 65°C. In such a case the unit will be controlled to
realize a temperature difference (ΔT) of 10°C, which means that
the returning water to the unit is around 55°C.
Depending on the installed application (radiators, fan coil
units, ...) or situation, it can be required to change the ΔT. This
can be done by changing field setting [A-02].
■
[A-03] See chapter "9.7. Multiple set point control" on page
■
[A-04] See chapter "9.7. Multiple set point control" on page
Installation manual
30
A
24°C–2°C = 22°C
C C
20°C–2°C = 18°C
B
[b] Domestic hot water set points
The reheat mode will prevent the domestic hot water from cooling
down lower than a certain temperature. When enabled the indoor unit
will deliver hot water to the domestic hot water tank if the reheat
minimum value is reached. The domestic water heating will continue
until the reheat maximum temperature is reached. In this way always
a minimum of domestic hot water is available.
■
[b-00] Set point: reheat minimum temperature (see figure
below).
■
[b-01] Set point: reheat maximum temperature (see figure
below).
T
A
D
E
F
G
A Storage operation (if activated)
B Reheat operation (if activated)
C Disinfection operation (if activated)
Field settings
D Disinfection operation temperature [5-00] (e.g. 70°C)
E Hot water storage temperature [b-03] (e.g. 60°C)
F Reheat maximum water temperature [b-01] (e.g. 45°C)
G Reheat minimum water temperature [b-00] (e.g. 35°C)
t Time
T Domestic hot water tank temperature
■
[b-02] Status: defines whether the weather dependent domestic
water heating is turned ON (1) or OFF (0).
If enabled, the storage set point will be set weather dependent.
In case of a higher ambient temperature (e.g. during summer-
time), the cold supply water to the mixing tap (e.g. shower, bath)
will also have a higher temperature. This makes that the
temperature of the hot water from the domestic hot water tank
may be lower to reach the same water mixing temperature from
the shower or bath mixing tap. In this way, with a lower domestic
hot water tank temperature setting the comfort level can be kept
the same but with a lower energy consumption.
T
[b-04]
[b-04]
55°C
A Ambient temperature
T Domestic hot water storage temperature
36.
INFORMATION
36.
The maximum setting temperature for domestic hot water
can be changed with field setting [b-04]. Other settings are
fixed
B C
15°C 25°C
VRVIII system indoor unit
t
A
HXHD125A7V1B
4PW62584-1A – 11.2010