Application 5 - Daikin EKHBHE008BA3V3 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. The decision whether either
the EKHB* indoor unit or the boiler will operate can be achieved by
an auxiliary contact or an EKHB* indoor controlled contact.
The auxiliary contact can e.g. be an outdoor temperature thermostat,
an electricity tariff contact, a manually operated contact, etc. See
"Field wiring configuration A" on page
The EKHB* indoor unit controlled contact (also called 'permission
signal for the auxiliary boiler") is determined by the outdoor
temperature (thermistor located at the outdoor unit). See
configuration B" on page 7.
Bivalent operation is only possible for space heating operation, not
for the domestic 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.
CAUTION
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 2 3 4 5
M
7 16
10 11
1 Outdoor unit
2 Indoor unit
3 Heat exchanger
4 Pump
5 Shut-off valve
6 Collector (field supply)
7 Shut-off valve
8 Motorised 3-way valve
(delivered with the
domestic hot water
tank)
10 Booster heater
EKHBH/XE008BA
Indoor unit for air to water heat pump system
4PW56301-1A
7.
"Field wiring
8 18 17 6
15 17
FHL1
FHL2
12
11 Heat exchanger coil
12 Domestic hot water tank
(optional)
15 Boiler (field supply)
16 Aquastat valve
(field supply)
17 Shut-off valve
(field supply)
18 Non-return valve
(field supply)
FHL1...3 Floor heating loop
(field supply)
Field wiring configuration A
L
EKHB*/auto / Boiler
N
Boiler
thermostat input
A
H
K1A
K2A
Field wiring configuration B
EKHB*
X2M
1 2 3 4
K1A
H C
Com
EKRTR*
Boiler
thermostat input
C
H
Com
K1A
KCR
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.
FHL3
For more details see field setting [C-02~C-04].
H Com
EKHB*
X2M
1 2 3 4
A
K1A
K1A K2A
Boiler thermostat input
Auxiliary contact (normal closed)
Heating demand room thermostat (optional)
Auxiliary relay for activation of EKHB* unit (field
supply)
Auxiliary relay for activation of boiler (field supply)
EKHB* EKRP1HB
X2M
1 2 3 4
KCR
X1 X2
K1A
K1A
C H X Y
Com
EKRTW* Boiler
thermostat input
Boiler thermostat input
Cooling demand room thermostat (optional)
Heating demand room thermostat (optional)
Common room thermostat (optional)
Auxiliary relay for activation of bolier unit
(field supply)
Permission signal for the auxiliary boiler
Boiler
thermostat input
X Y
K2A
Installation manual
7