Daikin EBHQ006BAV3 Installation Manual page 16

Field wiring configuration A
L
H Com
EKCB(H/X)*/auto / Boiler
A
K1A K2A
N
Boiler Boiler thermostat input
thermostat input
A Auxiliary contact (normal closed)
H Heating demand room thermostat (optional)
K1A Auxiliary relay for activation of EBHQ* unit
(field supply)
K2A Auxiliary relay for activation of boiler (field supply)
Field wiring configuration B
EKCB(H/X)* EKRP1HB
X2M
1 2 3 4
KCR
X1 X2
K1A
K1A
C H X Y
Com
Boiler
EKRTW*
thermostat input
Boiler Boiler thermostat input
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 boiler unit
(field supply)
KCR Permission signal for the auxiliary boiler
Operation
Configuration A
When the room thermostat requests heating, either the EBHQ*
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 EBHQ*
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 EBHQ* unit will be automatically
switched off.
For more details see field setting [C-02~C-04].
Installation manual
14
EKCB(H/X)* Boiler
thermostat input
X2M
1 2 3 4 X Y
K1A K2A
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
"13.2. Room thermostat installation configuration" on
page 28.
For configuration B: Make sure to configure the field
settings [C-02, C-03 and C-04] correctly. Refer to "Bivalent
operation" on page 37.
CAUTION
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
(a)
and install an aquastat
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.
CAUTION
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.
valve in the return water flow of
EBHQ006+008BAV3 + EKCBX/H008BAV3
Unit for air to water heat pump system
4PW64602-1A – 09.2010