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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.
Details on pump configuration can be found under
"13.3. Pump operation configuration" on page
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).
CAUTION
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
CAUTION
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.
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
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
configuration B" on page
14.
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.
EBHQ006+008BAV3 + EKCBX/H008BAV3
Unit for air to water heat pump system
4PW64602-1B – 09.2010
29.
11.
14.
"Field wiring
CAUTION
■
Be sure that the boiler and the integration of the boiler
in the system is in accordance with relevant local laws
and regulations.
■
Always install a 3-way valve, even if no domestic hot
water tank is installed. This to ensure that the freeze
protection function (see
function" on page
active.
1
Motorised 3-way valve
2
Boiler
■
Daikin can not be put responsible for incorrect or
unsafe situations in the boiler system.
C
1
2
3
4
5
1
Outdoor unit
2
Heat exchanger
3
Pump
4
Shut-off valve
5
Heater kit
6
Collector (field supply)
7
Motorised 3-way valve
(delivered with the domestic hot water tank)
9
Booster heater
10
Heat exchanger coil
11
Domestic hot water tank (optional)
14
Boiler (field supply)
15
Aquastat valve (field supply)
16
Shut-off valve (field supply)
17
Non-return valve (field supply)
FHL1...3
Floor heating loop (field supply)
C
Control box
I
User interface
"[4-04] Freeze protection
33) can operate when the boiler is
I
C
1
M
2
FHL1 FHL2 FHL3
I
7
17
16
6
M
14
16
15
9 11 10
FHL1
FHL2
Installation manual
FHL3
13
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