Daikin EKHBX030BA Installation Manual page 9

Field wiring configuration A
L
H Com
EKHB*/auto / Boiler
A
K1A K2A
N
Boiler thermostat Boiler thermostat input
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)
Field wiring configuration B
EKHB* EKRP1HB
X2M
1 2 3 4
KCR
X1 X2
K1A
K1A
C H X Y
Com
EKRTW* Boiler
thermostat input
Boiler thermostat Boiler thermostat input
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
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].
EKHBH/X030BA
Indoor unit for air to water heat pump system
4PW62568-1 – 07.2010
EKHB* Boiler
thermostat input
X2M
1 2 3 4 X Y
K1A K2A
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
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 131°F (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.
Make sure to configure the DIP switch SS2-3 on the
NOTE
PCB of the EKHB* switchbox correctly. Refer to "Room
thermostat installation configuration" on page 23.
For configuration B: Make sure to configure the field
settings [C-02, C-03 and C-04] correctly. Refer to
"Bivalent operation" on page 32.
CAUTION
Make sure that return water to the EKHB* heat exchanger
never exceeds 131°F (55°C).
For this reason, never put the target leaving water
temperature set point on the boiler controller above 131°F
(55°C) and install an aquastat
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 131°F (55°C) and must operate to close the
return water flow to the unit when the measured temperature exceeds 131°F
(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
77°F (25°C).
on the outdoor
(a)
valve in the return water
Installation manual
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