EKHBH/X008BA
Indoor unit for air to water heat pump system
4PW54185-1B
Installation manual
7
Field wiring configuration A
Field wiring configuration B
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].
Boiler
thermostat input
Boiler thermostat input
A
Auxiliary contact (normal closed)
H
Heating demand room thermostat (optional)
K1A
Auxiliary relay for activation of EKHB* unit (field
supply)
K2A
Auxiliary relay for activation of boiler (field supply)
Boiler
thermostat input
Boiler thermostat input
C
Cooling demand room thermostat (optional)
H
Heating demand room thermostat (optional)
Com
Common room thermostat (optional)
K1A
Auxiliary relay for activation of bolier unit
(field supply)
KCR
Permission signal for the auxiliary boiler
1
2
3
4
K1A
K1A
K2A
X Y
K2A
Boiler
thermostat input
L
N
EKHB*/auto
/
Boiler
A
EKHB*
X2M
H
Com
X1 X2
X Y
K1A
KCR
EKRP1HB
Boiler
thermostat input
1
2
3
4
H C
Com
K1A
EKHB*
X2M
EKRTR*
1
2
3
4
C
Com
H
K1A
EKHB*
X2M
EKRTW*
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 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.
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 21
For configuration B: Make sure to configure the field
settings [C-02, C-03 and C-04] correctly. Refer to
"Bivalent operation" on page 29
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
(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 (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.
