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8.6. 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 achive 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
2
3
4
1
Outdoor unit
2
Heat exchanger
3
Pump
4
Shut-off valve
5
Heater kit
6
Collector zone A (field supply)
7
Collector zone B (field supply)
8
Mixing station (field supply)
FCU1...3
Fan coil unit (optional)
FHL1...3
Floor heating loop (field supply)
C
Control box
T1
Room thermostat for zone A (optional)
T2
Room thermostat for zone B (optional)
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.
EBHQ006+008BAV3 + EKCBX/H008BAV3
Unit for air to water heat pump system
4PW64602-1B – 09.2010
T1
B
C
7
T2
FCU1
FCU2
5
8
A
6
FHL1
FHL2
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 indoor unit, the pump (3) will
operate when there is a request for heating from T1 and/or T2. The
outdoor unit will start operating to achieve the target leaving water
temperature. The target leaving water temperature depends on which
room thermostat is requesting heating.
Set point
Zone A
First
Zone B
Second
Resulting water temperature
Result pump operation
When the room temperature of both zones is above the thermostat
set point, the outdoor unit and pump will stop operating.
NOTICE
■
Make sure to connect the thermostat wires to the
correct terminals (see
page
■
Make sure to configure the field settings [7-02], [7-03]
and [7-04] correctly. Refer to
on page
■
Make sure to configure the DIP switch SS2-3 on the
PCB of the EBHQ* switch box correctly. Refer to
"13.2. Room thermostat installation configuration" on
page
FCU3
NOTICE
■
The request signals for space heating can be
implemented in two different ways (installer choice).
-
-
■
It is the installers responsibility to make sure no
unwanted situations can occur (e.g. too high water
temperatures towards floor heating loops, etc.)
FHL3
■
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 requests 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 requests 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.
CAUTION
Be aware that the actual water temperature through the
floor heating loops depends on the control and setting of
the mixing station.
Field setting
Thermo status
UI
ON
OFF
[7-03]
OFF
ON
UI
[7-03]
ON
ON
"5. Overview of unit" on
5).
"Dual set point control"
35.
28.
Thermo ON/OFF signal from room thermostat
Status signal (active/not active) from the mixing
station
ON
OFF
ON
OFF
[7-03]
—
ON
OFF
Installation manual
15
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