Installation manual
6
EKHBH/X008BA
Indoor unit for air to water heat pump system
4PW54185-1B
Pump operation
With no thermostat connected to the indoor unit (2), the pump (4) can
be configured to operate either as long as the indoor unit is on, or
until the required water temperature is reached.
Space heating and cooling
According to the season, the customer will select heating or cooling
through the user interface on the indoor unit.
The outdoor unit (1) will operate in heating mode or cooling mode to
achieve the target leaving water temperature.
With the unit in heating mode, the 2-way valve (13) is open. Hot water
is provided to both the fan coil units and the floor heating loops.
With the unit in cooling mode, the 2-way valve (13) is closed to
prevent cold water running through the floor heating loops (FHL).
The ON/OFF setting of the heating/cooling operation is done by the
user interface on the indoor unit.
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.
1
Outdoor unit
14
Motorised 2-way valve for
activation of the room
thermostat (field supply)
2
Indoor unit
3
Heat exchanger
4
Pump
FCU1..3
Fan coil unit with
thermostat (optional)
5
Shut-off valve
6
Collector (field supply)
FHL1..3
Floor heating loop
7
Shut-off valve
T
Heating only room
thermostat (optional)
9
By-pass valve (field
supply)
13
Motorised 2-way valve
to shut off the floor
heating loops during
cooling operation (field
supply)
T4..6
Individual room
thermostat for fan coil
heated/cooled room
(optional)
NOTE
Details on pump configuration can be found under
"Pump operation configuration" on page 22
.
When closing several loops in the system by remotely
controlled valves, it might be required to install a by-pass
valve (9) to avoid the flow switch safety device from being
activated. See also
.
Wiring of the 2-way valve (13) is different for a NC (normal
closed) valve and a NO (normal open) valve! Make sure to
connect to the correct terminal numbers as detailed on the
wiring diagram.
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
