Installation manual
12
0 EKCBX/H008BAV3
Unit for air to water heat pump system
4PW64602-1A – 09.2010
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 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 (9) can provide auxiliary heating.
8.3.
Application 3
Space cooling and heating application with a room thermostat
suitable for heating/cooling changeover connected to the 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 unit.
1
Outdoor unit
2
Heat exchanger
3
Pump
4
Shut-off valve
5
Heater kit
6
Collector (field supply)
7
Motorised 3-way valve (optional)
9
Booster heater
10
Heat exchanger coil
11
Domestic hot water tank
12
Motorised 2-way valve (field supply)
FCU1...3
Fan coil unit (field supply)
FHL1...3
Floor heating loop (field supply)
C
Control box
T
Room thermostat with heating/cooling switch (optional)
I
User interface
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 "8.2. Application 2" on
page 11.
8.4.
Application 4
Space cooling and heating 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
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
CAUTION
It is possible to connect either a 2-wire or a 3-wire 3-way
valve (7). Make sure to fit the 3-way valve correctly. For
more details, refer to "Wiring the 3-way valve" on page 28.
The unit can be configured so that at low outdoor
temperatures the domestic 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 "13.9. Field
settings" on page 31, field settings [5-02] to [5-04].
FHL1
FHL2
FHL3
12
10
9 11
M
FCU1
FCU2
FCU3
6
6
T
M
7
I
C
4
3
2
5
1
CAUTION
Make sure to connect the thermostat wires to the correct
terminals (see "Connection of the thermostat cable" on
page 27) and to configure the DIP switch toggle switches
correctly (see "13.2.
Room thermostat installation
configuration" on page 28).
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.
FHL1
FHL2
FHL3
T
8
T4
T5
T6
13
M
FCU1
FCU2
FCU3
6
6
M
12
I
C
4
3
2
5
1
4PW64602-1A.book Page 12 Thursday, September 23, 2010 10:40 AM
