6 | Application guidelines
Installer reference guide
40
EWAA011~016DA + EWYA009~016DA
Packaged air-cooled water chillers
and packaged air to water heat pumps
4P620242-1 – 2020.06
▪ For the additional zone:
- The fan coil units are directly connected to the outdoor unit – or to the backup
heater, if there is one
- The desired room temperature is set via the remote controller of the fan coil
units.
- The heating or cooling demand signals of each fan coil unit are connected in
parallel to the digital input on the outdoor unit (X2M/35a and X2M/30). The
outdoor unit will only supply the desired additional leaving water temperature
when there is an actual demand.
▪ The user interface connected to the outdoor unit decides the space operation
mode. Mind that the operation mode on each remote controller of the fan coil
units must be set to match the outdoor unit.
Configuration
Setting Value
Unit temperature control:
▪ #: [2.9]
▪ Code: [C-07]
2 (Room thermostat): Unit operation
is decided based on the ambient
temperature of the dedicated Human
Comfort Interface.
Note:
▪ Main room = dedicated Human
Comfort Interface used as room
thermostat functionality
▪ Other rooms = external room
thermostat functionality
Number of water temperature zones:
▪ #: [4.4]
▪ Code: [7-02]
1 (Dual zone): Main + additional
In case of fan coil units:
External room thermostat for the
additional zone:
▪ #: [3.A]
▪ Code: [C-06]
1 (1 contact): When the used
external room thermostat or fan coil
unit can only send a thermo ON/OFF
condition. No separation between
heating or cooling demand.
Shut-off valve output Set to follow the thermo demand of the
main zone.
Shut-off valve If the main zone must be shut off during
cooling mode to prevent condensation
on the floor, set it accordingly.
At the mixing valve station Set the desired main leaving water
temperature for heating and/or cooling.
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