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Application 2
Space heating only application without room thermostat connected to
the unit. The temperature in each room is controlled by a valve on
each water circuit. Domestic hot water is provided through the
domestic hot water tank which is connected to the unit.
1
2
3
4
1
Unit
2
Heat exchanger
3
Pump
4
Shut-off valve
5
Collector (field supply)
6
Motorised 3-way valve
(optional)
7
By-pass valve
(field supply)
8
Booster heater
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.
NOTE
Details on pump configuration can be found under
"Pump operation configuration" on page
Space heating
The unit (1) will operate to achieve the target leaving water
temperature as set on the user interface.
When circulation in each space heating loop (FHL1..3) is
controlled by remotely controlled valves (M1..3), it is
important to provide a by-pass valve (7) to avoid the flow
switch safety device from being activated.
The by-pass valve should be selected as such that at all
time the minimum water flow as mentioned under
pipework" on page 14
It is recommended to select a pressure difference
controlled by-pass valve.
E(D/B)(H/L)Q011~016BA6V3+W1
Unit for air to water heat pump system
4PW57621-1A
I
6
5
T1
T2
T3
M
M1
M2
M3
8
9
FHL1
FHL2
FHL3
10
9
Heat exchanger coil
10
Domestic hot water tank
(optional)
FHL1..3
Floor heating loop
(field supply)
T1..3
Individual room
thermostat (field supply)
M1..3
Individual motorised
valve to control loop
FHL1 (field supply)
I
User interface
26.
is guaranteed.
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 (8) can provide auxiliary heating.
It is possible to connect either a 2-wire or a 3-wire 3-way
7
valve (6). Make sure to fit the 3-way valve correctly. For
more details, refer to
The unit can be configured so that at low outdoor
NOTE
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
settings" on page
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
2
1
Unit
2
Heat exchanger
"Water
3
Pump
4
Shut-off valve
5
Collector (field supply)
6
Motorised 3-way valve
(optional)
8
Booster heater
9
Heat exchanger coil
"Wiring the 3-way valve" on page
28, field settings [5-02] to [5-04].
5
I
T
3
4
6
11
FCU1
M
M
8
9
FHL1
10
Domestic hot water tank
11
Motorised 2-way valve
(field supply)
FCU1..3
Fan coil unit (field supply)
FHL1..3
Floor heating loop
(field supply)
T
Room thermostat with
heating/cooling switch
(optional)
I
User interface
23.
"Field
FCU2
FCU3
FHL2
FHL3
10
Installation manual
8
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