Daikin INTERGAS Altherma NHY2KOMB28AA Installer's Reference Manual page 66

10 Configuration
# Code
[A.4.4.4] [2‑03] Temperature target: fixed value
[A.4.4.5] [2‑04] Duration
Range: 40~60 minutes
T
DHW
[2-03]
T
H
T
U
00.00 01.00 22.00
T Domestic hot water temperature
DHW
T User set point temperature
U
T High set point temperature [2-03]
H
t Time
WARNING
Be aware that the domestic hot water temperature at the
hot water tap will be equal to the value selected in field
setting [2-03] after a disinfection operation.
When the 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.
CAUTION
Be sure that the disinfection function start time [A.4.4.3]
with defined duration [A.4.4.5] is NOT interrupted by
possible domestic hot water demand.
INFORMATION
Disinfection function is restarted in case the domestic hot
water temperature drops 5°C below the disinfection target
temperature within the duration time.
INFORMATION
An AH error occurs if you do the following during
disinfection:
▪ Set the user permission level to Installer.
▪ Go to the DHW tank temperature home page (Tank).
▪ Press to interrupt the disinfection.
Heat source settings
Auto emergency
When the heat pump fails to operate, the gas boiler can serve as an
emergency back-up heater and either automatically or non-
automatically take over the entire heat load.
▪ When auto emergency is set to Automatic and a heat pump
failure occurs, the boiler will automatically take over the heat load.
▪ When auto emergency is set to Manual and a heat pump failure
occurs, the domestic hot water and space heating operations will
stop and need to be recovered manually. The user interface will
then ask the user to confirm whether the boiler can take over the
entire heat load or not.
Installer reference guide
66
Description
[2-04]
23.00 24.00 t
[2-02]
When the heat pump fails, will appear on the user interface. If the
house is unattended for longer periods, we recommend to set
[A.6.C] Emergency to Automatic.
# Code
[A.6.C] N/A Emergency:
▪ 0: Manual
▪ 1: Automatic
INFORMATION
The auto emergency setting can be set in the menu
structure of the user interface only.
INFORMATION
If a heat pump failure occurs and [A.6.C] is set to Manual,
the room frost protection function, the underfloor heating
screed dryout function, and the water pipe antifreeze
function will remain active even if the user does NOT
confirm emergency operation.
Bivalent
Only applicable in case of third-party gas boiler.
About bivalent
The purpose of this function is to determine which heating source
can/will provide the space heating, either the outdoor unit or the
third-party gas boiler.
The switch-over between the outdoor unit and the gas boiler is
based on the following settings:
▪ [C‑03] and [C‑04]
▪ Electricity and gas prices ([7.4.5.1], [7.4.5.2], [7.4.5.3], and [7.4.6])
[C‑03], [C‑04], and T
calc
Based on the settings above, the outdoor unit calculates a value
T , which is variable between [C‑03] and [C‑03]+[C‑04].
calc
3°C
a
b
T [C-03]+[C-04]
[C-03]
calc
T
A
T Outdoor temperature
A
T Bivalent ON temperature (variable). Below this
calc
temperature, the gas boiler will always be ON. T
never go below [C‑03] or above [C‑03]+[C‑04].
3°C Fixed hysteresis to prevent too much switching between
outdoor unit and gas boiler
a Gas boiler active
b Gas boiler inactive
If the outdoor
temperature...
Space heating by
the outdoor unit...
Drops below T Stops
calc
Rises above T +3°C Starts
calc
INFORMATION
The bivalent signal for the third-party gas boiler is located
on X2M/7+8 of the outdoor unit. When it is activated,
contact X2M/7+8 is closed. When it is deactivated,
X2M/7+8 is open.
See also "To connect the bivalent signal for third-party gas
boiler" on page 46.
# Code
N/A [C-03] Range: –25°C~25°C (step: 1°C)
Description
can
calc
Then...
Bivalent signal for
the gas boiler is...
Active
Inactive
Description
EJHA04AAV3 + NHY2KOMB28+32AA
Daikin Altherma H Hybrid
4P556861-1A – 2019.05