EKHBH/XE008BA
Indoor unit for air to water heat pump system
4PW56301-1A
Installation manual
7
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 7
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
.
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.
Field wiring configuration A
Field wiring configuration B
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].
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
Outdoor unit
11
Heat exchanger coil
2
Indoor unit
12
Domestic hot water tank
(optional)
3
Heat exchanger
4
Pump
15
Boiler (field supply)
5
Shut-off valve
16
Aquastat valve
(field supply)
6
Collector (field supply)
7
Shut-off valve
17
Shut-off valve
(field supply)
8
Motorised 3-way valve
(delivered with the
domestic hot water
tank)
18
Non-return valve
(field supply)
FHL1...3
Floor heating loop
(field supply)
10
Booster heater
M
FHL1
FHL2
FHL3
5
4
3
2
1
8
18
16
17
15
7
6
17
12
10 11
Boiler
thermostat input
Boiler thermostat 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)
Boiler
thermostat input
Boiler 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 bolier unit
(field supply)
KCR
Permission signal for the auxiliary boiler
1
2
3
4
K1A
K1A
K2A
X Y
K2A
Boiler
thermostat input
L
N
EKHB*/auto
/
Boiler
A
EKHB*
X2M
H
Com
X1 X2
X Y
K1A
KCR
EKRP1HB
Boiler
thermostat input
1
2
3
4
H C
Com
K1A
EKHB*
X2M
EKRTR*
1
2
3
4
C
Com
H
K1A
EKHB*
X2M
EKRTW*
