Installation manual
9
E(D/B)(H/L)Q011~016BB
Unit for air to water heat pump system
4PW67904-1 – 01.2011
Application 6
Space heating with room thermostat application through floor heating
loops and fan coil units. The floor heating loops and fan coil units
require different operating water temperatures.
The floor heating loops require a lower water temperature in heating
mode compared to fan coil units. To achieve these two set points, a
mixing station is used to adapt the water temperature according to
requirements of the floor heating loops. The fan coil units are directly
connected to the unit water circuit and the floor heating loops after
the mixing station. The control of this mixing station is not done by the
unit.
The operation and configuration of the field water circuit is the
responsibility of the installer.
Daikin only offers a dual set point control function. By this function
two set points can be generated. Depending on the required water
temperature (floor heating loops and/or fan coil units are required)
first set point or second set point can be activated.
1 Unit
2 Heat exchanger
3 Backup heater
4 Pump
5 Shut-off valve
6 Collector zone A (field supply)
7 Collector zone B (field supply)
8 Mixing station (field supply)
T1 Room thermostat for zone A (optional)
T2 Room thermostat for zone B (optional)
FCU1...3 Fan coil unit (optional)
FHL1...3 Floor heating loop (field supply)
Pump operation and space heating
When the room thermostat for the floor heating loop (T1) and the fan
coil units (T2) are connected to the unit, the pump (
4
) will operate
when there is a request for heating from T1 and/or T2. The unit will
start operating to achieve the target leaving water temperature. The
target leaving water temperature depends on which room thermostat
is requesting heating.
When the room temperature of both zones is above the thermostat
set point, the unit and pump will stop operating.
INFORMATION
■
The advantage of the dual set point control is that the
heat pump will/can operate at the lowest required
leaving water temperature when only floor heating is
required. Higher leaving water temperatures are only
required in case fan coil units are operating.
This results in a better performance of the heat pump.
■
The hydraulic balance is very important. (unit - mixing
station - FCU1...3)
FHL1
FHL2
FHL3
T1
T2
FCU1
FCU2
FCU3
8
7
6
B
A
5
4
2
3
1
Set point
Field setting
Thermo status
Zone A
First
UI
ON
OFF
ON
OFF
Zone B
Second
[7-03]
OFF
ON
ON
OFF
Resulting water temperature
UI
[7-03]
[7-03]
—
Result pump operation
ON
ON
ON
OFF
NOTICE
■
Make sure to connect the thermostat wires to the
correct terminals (see
"5. Overview of the unit" on
page 10
).
■
Make sure to configure the field settings [7-02], [7-03]
and [7-04] correctly. Refer to
"Dual set point control"
on page 39
.
■
Make sure to configure the DIP switch SS2-3 on the
PCB of the switch box correctly. Refer to
"10.2. Room
thermostat installation configuration" on page 29
.
■
It is the installers responsibility to make sure no
unwanted situations can occur (e.g. too high water
temperatures towards floor heating loops, etc.)
■
Be aware that the actual water temperature through
the floor heating loops depends on the control and
setting of the mixing station.
INFORMATION
■
The request signals for space heating can be
implemented in two different ways (installer choice).
-
Thermo ON/OFF signal from room thermostat
-
Status signal (active/not active) from the mixing
station
■
Daikin does not offer any type of mixing station. Dual
set point control only provides the possibility to use
two set points.
■
When only zone A request heating, zone B will be fed
with water at a temperature equal to the first set point.
This can lead to unwanted heating of zone B.
■
When only zone B request heating, the mixing station
will be fed with water at a temperature equal to the
second set point.
Depending on the control of the mixing station, the
floor heating loop can still receive water at a
temperature equal to set point of the mixing station.
■
At this type of application heating/cooling selection
always has to be done on the user interface. Refer to
"Dual set point control" on page 39
for more details.
