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EKCBX/H008BBV3
Unit for air to water heat pump system
4PW66983-1C – 08.2011
Installation manual
11
8.6.
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 unit water circuit and the floor heating loops after
the mixing station. The control of this mixing station is not done by the
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.
1
Outdoor unit
2
Heat exchanger
3
Pump
4
Shut-off valve
5
Heater kit (optional)
6
Collector zone A (field supply)
7
Collector zone B (field supply)
8
Mixing station (field supply)
FCU1...3
Fan coil unit (optional)
FHL1...3
Floor heating loop (field supply)
C
Control box
T1
Room thermostat for zone A (optional)
T2
Room thermostat for zone B (optional)
NOTICE
■
Configuration A
Make sure that auxiliary contact (A) has sufficient
differential or time delay so as to avoid frequent
changeover between the EBHQ* 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 EBHQ* unit and the boiler. As the outdoor
temperature is measured via the outdoor unit’s 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 EBHQ*
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 depending
on the outdoor 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 unit.
NOTICE
Make sure to configure the DIP switch SS2-3 on the PCB
of the EKCB(H/X)* switch box correctly. Refer to
Room thermostat installation configuration" on
.
For configuration B: Make sure to configure the field
settings [C-02, C-03 and C-04] correctly. Refer to
NOTICE
Make sure that return water to the EBHQ* 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
(a)
valve in the return water flow of
the EBHQ* 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 EBHQ* unit again.
INFORMATION
Manual permission towards the EBHQ* unit on the boiler.
In case only the EBHQ* 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.
INFORMATION
■
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.
■
The hydraulic balance is very important. (outdoor unit
- heater kit (if applicable) - mixing station - FCU1...3)
FHL1
FHL2
FHL3
T1
T2
FCU1
FCU2
FCU3
7
6
B
A
C
4
3
2
8
5
1
