Installation manual
7
EKHBH/X016BB
Indoor unit for air to water heat pump system
4PW62572-1A – 01.2011
Space heating and cooling
According to the season, the customer will select heating or cooling
through the user interface on the indoor unit.
) 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 (
) 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 (
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
2
Indoor unit
3
Heat exchanger
4
Backup heater
(1)
5
Pump
6
Shut-off valve
7
Motorised 3-way valve (delivered with domestic hot water
tank)
8
Non-return valve (field supply)
9
Shut-off valve (field supply)
10
Collector (field supply)
11
Boiler (field supply)
12
Aquastat valve (field supply)
13
Domestic hot water tank (optional)
14
Booster heater
(2)
15
Heat exchanger coil
FHL1...3
Floor heating loop
Field wiring configuration A
B
TI
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)
NOTICE
■
When closing several loops in the system by remotely
controlled valves, it might be required to install a by-
pass valve (
) to avoid the flow switch safety device
from being activated. See also
■
Wiring of the 2-way valve (
) 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 the applicable
legislation.
■
Daikin can not be put responsible for incorrect or
unsafe situations in the boiler system.
(1) For tank without electrical booster heater (EKHTS), the backup heater will
be used in domestic water heating mode.
(2) Only applicable for tank with built-in electrical booster heater (EKHW*).
M
FHL1
FHL2
FHL3
8
8
9
9
12
11
6
10
4
5
3
2
1
6
7
13
14 15
1
2
3
4
K1A
K1A
K2A
X Y
K2A
BTI
L
N
EKHB*/auto
/
Boiler
A
EKHB*
X2M
H
Com
