Installation manual
9
EKHBH/X008BB
Indoor unit for air to water heat pump system
4PW62570-1A – 01.2011
Domestic water heating
(1)
Domestic water heating is as described under
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.
1
Outdoor unit
2
Indoor unit
3
Heat exchanger
4
Backup heater
5
Pump
6
Shut-off valve
7
Collector zone B (field supply)
8
Collector zone A (field supply)
9
Mixing station (field supply)
FCU1...3
Fan coil unit (optional)
FHL1...3
Floor heating loop
T1
Room thermostat for zone A (optional)
T2
Room thermostat for zone B (optional)
NOTICE
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
(a)
valve in the return water flow of
the EKHB* unit.
Make sure that the non-return valves (field supply) are
correctly installed in the system.
Make sure that the room thermostat EKRTR or EKRTW
are 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.
INFORMATION
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.
(1) When the unit is configured for restricted power supply condition mode,
see
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. (Hydrobox -
mixing station - FCU1...3)
FHL1
FHL2
FHL3
T1
T2
FCU1
FCU2
FCU3
9
7
8
B
A
6
4
5
3
2
1
6
