Application 5 - Daikin EKHBRD011AAV1 Installation Manual

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.
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 12 2 3 12 4
M
5 8
1 Outdoor unit
2 Indoor unit
3 Refrigerant heat
exchanger
4 Water heat exchanger
5 Compressor
6 Pump
7 Shut-off valve
8 Motorised 3-way valve
(field supply)
9 Domestic hot water
tank
10 Collector (field supply)
11 Radiator (field supply)
Installation manual
5
A B
C1
6 7 7 10 13
11
17 15 15
16
9 16 14
12 Electronic expansion
valve
13 By-pass valve (field
supply)
14 Boiler (field supply)
15 Non-return valve
(field supply)
16 Shut-off valve
(field supply)
17 Aquastat valve
(field supply)
C1 Remote controller
A Installation place
B Living room
Field wiring
L
th
EKHBRD*/auto / Boiler
C
K1A K2A
N
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)
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).
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
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
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.
EKHBRD* Boiler
thermostat
A8P
1 2 3 4 5 X Y
K1A K2A
depending on the
(a)
valve in the return water flow of
EKHBRD011~016AAV1+Y1
Indoor unit for air to water heat pump system
4PW54465-1A
outdoor