EKHBH/X008BA
Indoor unit for air to water heat pump system
4PW54185-1B
Installation manual
5
Domestic water heating
When domestic water heating mode is enabled (either manually by
the user, or automatically through a schedule timer) the target
domestic hot water temperature will be achieved by a combination of
the heat exchanger coil and the electrical booster heater.
When the domestic hot water temperature is below the user
configured set point, the 3-way valve will be activated to heat the
domestic hot water by means of the heat pump. In case of large
domestic hot water demand or a high domestic hot water
temperature setting, the booster heater (11) can provide auxiliary
heating.
Application 3
Space heating and cooling application with the room thermostat set
for heating/cooling connected to the indoor unit. Heating is provided
through floor heating loops and fan coil units. Cooling is provided
through the fan coil units only.
Domestic hot water is provided through the domestic hot water tank
which is connected to the indoor unit.
Pump operation and space heating and cooling
According to the season, the customer will select heating or cooling
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 indoor unit (2) will switch to
"heating mode"/"cooling mode". The outdoor unit (1) will start
operating to achieve the target leaving hot/cold water temperature.
In case of cooling mode, the 2-way valve (13) 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 on the
indoor unit.
Domestic water heating
Domestic water heating is as described under
Application 4
Space heating and cooling application without the room thermostat
connected to the indoor unit, but with the heating only room
thermostat (set heating only) controlling the floor heating and the
heating/cooling thermostat (set heating/cooling) 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.
NOTE
The indoor unit can be configured so that at low
outdoor temperatures the domestic hot water is
exclusively heated by the booster heater. This assures
that the full capacity of the heat pump is available for
space heating.
Details on domestic hot water tank configuration for
low outdoor temperatures can be found under
, field settings [5-02] to [5-04].
1
Outdoor unit
10
Domestic hot water tank
(optional)
2
Indoor unit
3
Heat exchanger
11
Booster heater
4
Pump
12
Heat exchanger coil
5
Shut-off valve
13
Motorised 2-way valve
(field supply)
6
Collector (field supply)
7
Shut-off valve
FCU1..3
Fan coil unit (optional)
8
Motorised 3-way valve
(delivered with
domestic hot water
tank)
FHL1..3
Floor heating loop
T
Room thermostat with
heating/cooling switch
(optional
M
M
FHL1
T
FHL2
FHL3
FCU1
FCU2
FCU3
5
4
3
2
1
6
7
8
13
10
11 12
NOTE
Make sure to connect the thermostat wires to the
correct terminals (see
) and to configure the DIP switch
toggle switches correctly (see
installation configuration" on page 21
).
NOTE
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.
M
FCU1
FCU2
FCU3
T4
T5
T6
FHL1
FHL2
FHL3
T
5
4
3
2
1
6
7
13
M
14
6
9
