Daikin EKHBX008BB3V3S Installation Manual page 11

Field wiring configuration B
EKHB* EKHB*
X2M X2M
1 2 3 4 1 2 3 4
K1A K1A
H C C H
Com Com
EKRTR* EKRTW*
B Boiler thermostat input
TI
C Cooling demand room thermostat (optional)
H Heating demand room thermostat (optional)
Com Common room thermostat (optional)
K1A Auxiliary relay for activation of boiler unit (field supply)
KCR Permission signal for the auxiliary boiler
Operation
■
Configuration A
When the room thermostat requests heating, either the EKHB*
unit or the boiler starts operating, depending on the position of
the auxiliary contact (A).
■
Configuration B
When the room thermostat requests heating, either the EKHB*
unit or the boiler starts operating, depending on the outdoor
temperature (status of "permission signal for the auxiliary
boiler").
When the permission is given towards the boiler, the space
heating operation by the EKHB* unit will be automatically
switched off.
For more details see field setting [C-02~C-04].
NOTICE
■
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 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 Daikin indoor unit.
NOTICE
Make sure to configure the DIP switch SS2-3 on the PCB
of the EKHB* switch box 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
operation" on page 36.
EKHBX008BB3V3S
Indoor unit for air to water heat pump system
4PW62597-1 – 10.2010
EKRP1HB*
KCR
X1 X2
K1A
X Y
B TI
"8.2. Room
24.
"Bivalent
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
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)
Domestic water heating
Domestic water heating is as described under
page 5.
(1) When the unit is configured for restricted power supply condition mode,
see "Appendix" on page 50.
(a)
valve in the return water flow of
"Application 2" on
Installation manual
8