Installation manual
5
EKHBRD011~0Y17
Indoor unit for air to water heat pump system
4P402191-1B – 2017.09
Application examples with 2 different heat sources
(auxiliary EKHBRD unit)
When using 2 heat sources, it is recommended to use a balancing
bottle as follows:
■
Application 5
Space heating with an auxiliary boiler (alternating operation)
Space heating application by either the Daikin indoor unit or by
an auxiliary boiler connected in the system. An auxiliary contact
decides whether either the EKHBRD* indoor unit or the boiler
will operate. This auxiliary contact can e.g. be an outdoor
temperature thermostat, an electricity tariff contact, a manually
operated contact, etc.
Bivalent operation is only possible for space heating operation,
not
for the domestic hot water heating operation. Domestic hot
water in such an application is always provided by the domestic
hot water tank which is connected to the Daikin indoor unit.
The auxiliary boiler must be integrated in the piping work and in
the field wiring according to the illustrations below.
■
Field wiring
■
Operation
When the room thermostat (th) closes, either the EKHBRD*
unit or the boiler starts operating, depending on the position
of the auxiliary contact (C).
■
Be sure that the boiler and the integration of the
boiler in the system is in accordance with
relevant European and national regulations.
■
Daikin can not be put responsible for incorrect or
unsafe situations in the boiler system.
1
Outdoor unit
12
Shut-off valve
2
Indoor unit
13
Non-return valve
(field supply)
3
Electronic expansion
valve
14
Pump (field supply)
4
Refrigerant heat
exchanger
15
Collector (field supply)
16
By-pass valve
(field supply)
5
Water heat exchanger
6
Pump
17
Shut off valve (field
supply)
7
Motorised 3-way valve
(optional)
18
Radiator (field supply)
8
Domestic hot water
tank (optional)
19
Aquastat valve
(field supply)
9
Compressor
20
Shut-off valve
(field supply)
10
Boiler (field supply)
11
Balancing bottle
(field supply)
C1
Remote controller
A
Installation place
B
Living room
3
3
4
5 6
8
2
1
11
M
9
12
12
7
C1
15
16
13
13
20
20
19
10
A
B
14
17 18
Boiler thermostat
Boiler thermostat
C
Auxiliary contact (normal closed)
th
Heating only room thermostat
K1A
Auxiliary relay for activation of EKHBRD* unit
(field supply)
K2A
Auxiliary relay for activation of boiler (field
supply)
NOTE
■
Make sure that auxiliary contact (C) has
sufficient differential or time delay so as to
avoid frequent changeover between the
EKHBRD* unit and the boiler. If the
auxiliary contact (C) 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.
Frequent switching may cause corrosion
of the boiler in an early stage. Contact the
manufacturer of the boiler.
■
During heating operation of the EKHBRD*
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 80°C.
Make sure that return water to the EKHBRD* heat
exchanger never exceeds 80°C.
For this reason, never put the target leaving water
temperature set point on the boiler controller
above 80°C and install an aquastat
(a)
valve in the
return water flow of the EKHBRD* 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 80°C and must operate to close the
return water flow to the unit when the measured temperature exceeds
80°C. When the temperature drops to a lower level, the aquastat valve
must operate to open the return water flow to the EKHBRD* unit
again.
1
2
3
4
5
K1A
K1A
K2A
X Y
K2A
Boiler
thermostat
L
th
N
EKHBRD*/auto
/
Boiler
C
EKHBRD*
A8P
4PEN402191-1B_2017_09.book Page 5 Friday, October 6, 2017 7:03 PM
