EKCBX/H008BBV3
Unit for air to water heat pump system
4PW66983-1C – 08.2011
Installation manual
9
Pump operation and space heating and cooling
According to the season, the customer will select cooling or heating
on the room thermostat (T). This selection is not possible by
operating the user interface.
When space heating/cooling is requested by the room thermostat
(T), the pump will start operating and the unit (1) will switch to
"heating mode"/"cooling mode". The unit (1) will start operating to
achieve the target leaving cold/hot water temperature.
In case of cooling mode, the motorised 2-way valve (12) will close as
to prevent cold water running through the floor heating loops (FHL).
The ON/OFF setting of the heating/cooling operation is done by the
room thermostat and cannot be done by the user interface.
Domestic water heating
Domestic water heating is as described under
8.4.
Application 4
Space heating and cooling application
without a room thermostat
connected to the unit
, but with a
heating only room thermostat
controlling the floor heating
and a heating/cooling thermostat controlling
the fan coil units. Heating is provided through floor heating loops and fan
coil units. Cooling is provided through the fan coil units only.
1
Outdoor unit
2
Heat exchanger
3
Pump
4
Shut-off valve
5
Heater kit (optional)
6
Collector (field supply)
8
By-pass valve (field supply)
12
Motorised 2-way valve to shut off the floor heating loops
during cooling operation (field supply)
13
Motorised 2-way valve for activation of the room thermostat
(field supply)
FCU1...3
Fan coil unit with thermostat (field supply)
FHL1...3
Floor heating loop (field supply)
T4...6
Individual room thermostat for fan coil heated/cooled room
(optional)
T
Heating only room thermostat (optional)
C
Control box
I
User interface
Pump operation
With no thermostat connected to the unit (1), the pump (3) can be
configured to operate either as long as the unit is on, or until the
required water temperature is reached.
Space heating and cooling
According to the season, the customer will select cooling or heating
through the user interface.
The unit (1) will operate in cooling mode or heating mode to achieve
the target leaving water temperature.
With the unit in heating mode, the 2-way valve (12) is open. Hot water
is provided to both the fan coil units and the floor heating loops.
With the unit in cooling mode, the motorised 2-way valve (12) 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.
8.5.
Application 5
Space heating with an auxiliary boiler (alternating operation)
Space heating application by either the Daikin unit or by an auxiliary
boiler connected in the system. The decision whether either the
EBHQ* unit or the boiler will operate can be achieved by an auxiliary
contact or an EKCB* 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 10
The EKCB* 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 unit.
The auxiliary boiler must be integrated in the piping work and in the
field wiring according to the illustrations below.
NOTICE
Make sure to connect the thermostat wires to the correct
terminals (see
"Connection of the thermostat cable" on
) and to configure the DIP switch toggle switches
correctly (see
NOTICE
Wiring of the 2-way valve (12) 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.
FHL1
FHL2
FHL3
T
8
T4
T5
T6
13
M
FCU1
FCU2
FCU3
6
6
M
12
I
C
4
3
2
5
1
INFORMATION
Details on pump configuration can be found under
"12.3. Pump operation configuration" on page 22
NOTICE
When closing several loops in the system by remotely
controlled valves, it might be required to install a by-pass
valve (8) to avoid the flow switch safety device from being
activated. See also
"8.2. Application 2" on page 8
.
NOTICE
Wiring of the 2-way valve (12) 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.
