Application 6 - Daikin EKHBHE008BA3V3 Installation Manual

NOTE Configuration A
Make sure that auxiliary contact (A) has sufficient
differential or time delay so as to avoid frequent
changeover between the EKHB* unit and the
boiler. If the auxiliary contact (A) is an outdoor
temperature thermostat, make sure to install the
thermostat in the shade, so that it is not
influenced or turned ON/OFF by the sun.
Configuration B
Make sure that the bivalent hysteresis [C-04] has
sufficient differential to avoid frequent changeover
between the EKHB* unit and the boiler. As the
outdoor temperature is measured via the outdoor
unit, air thermistor make sure to install the
outdoor unit in the shade, so that it is not
influenced by the sun.
Frequent switching may cause corrosion of the
boiler in an early stage. Contact the manufacturer
of the boiler.
During heating operation of the EKHB* unit, the
unit will operate so as to achieve the target
leaving water temperature as set on the user
interface. When weather dependent operation is
active, the water temperature is determined
automatically
temperature.
During heating operation of the boiler, the boiler
will operate so as to achieve the target leaving
water temperature as set on the boiler controller.
Never set the target leaving water temperature set
point on the boiler controller above 55°C.
Make sure to only have 1 expansion vessel in the
water circuit. An expansion vessel is already
premounted in the Daikin indoor unit.
NOTE Make sure to configure the DIP switch SS2-3 on the
PCB of the EKHB* switchbox correctly. Refer to
thermostat installation configuration" on page
For configuration B: Make sure to configure the field
settings [C-02, C-03 and C-04] correctly. Refer to
"Bivalent operation" on page
CAUTION
Make sure that return water to the EKHB* heat exchanger
never exceeds 55°C.
For this reason, never put the target leaving water
temperature set point on the boiler controller above 55°C
and install an aquastat
the EKHB* unit.
Make sure that the non-return valves (field supply) are
correctly installed in the system.
Make sure that the room thermostat (th) is not frequently
turned ON/OFF.
Daikin shall not be held liable for any damage resulting
from failure to observe this rule.
(a) The aquastat valve must be set for 55°C and must operate to close the return
water flow to the unit when the measured temperature exceeds 55°C. When the
temperature drops to a lower level, the aquastat valve must operate to open the
return water flow to the EKHB* unit again.
Manual permission towards the EKHB* unit on the boiler.
In case only the EKHB* unit should operate in space
heating mode, disable the bivalent operation via setting
[C-02].
In case only the boiler should operate in space heating
mode, increase the bivalent ON temperature [C-03] to
25°C.
Installation manual
8
depending on the outdoor
"Room
21.
28.
(a)
valve in the return water flow of

Application 6

Space heating with room thermostat application through floor heating
loops and fan coil units. The floor heating loops and fan coil units
require different operating water temperatures.
The floor heating loops require a lower water temperature in heating
mode compared to fan coil units. To achive these two set points, a
mixing station is used to adapt the water temperature according to
requirements of the floor heating loops. The fan coil units are directly
connected to the indoor unit water circuit and the floor heating loops
after the mixing station. The control of this mixing station is not done
by the indoor unit.
The operation and configuration of the field water circuit is the
responsibility of the installer.
Daikin only offers a dual set point control function. By this function
two set points can be generated. Depending on the required water
temperature (floor heating loops and/or fan coil units are required)
first set point or second set point can be activated.
T1
T2
1 2 3 4 5
8
1 Outdoor unit
2 Indoor unit
3 Heat exchanger
4 Pump
5 Shut-off valve
6 Collector zone A
(field supply)
7 Collector zone B
(field supply)
The advantage of the dual set point control is that the heat
pump will/can operate at the lowest required leaving water
temperature when only floor heating is required. Higher
leaving water temperatures are only required in case fan
coil units are operating.
This results in a better performance of the heat pump.
B
7
FCU1
FCU2
FCU3
A
6
FHL1
9
FHL2
FHL3
8 Shut-off valve
9 Mixing station (field supply)
T1 Room thermostat for zone
A (optional)
T2 Room thermostat for zone
B (optional)
FCU1..3 Fan coil unit (optional)
FHL1...3 Floor heating loop
(field supply)
EKHBH/XE008BA
Indoor unit for air to water heat pump system
4PW56301-1A