6 | Application guidelines
Installer reference guide
38
EWAA011~016DA + EWYA009~016DA
Packaged air-cooled water chillers
and packaged air to water heat pumps
4P620242-1 – 2020.06
▪ For each room with fan coil units: The desired room temperature is set via the
remote controller of the fan coil units.
▪ For each room with underfloor heating: The desired room temperature is set via
the external room thermostat (wired or wireless).
▪ The user interface connected to the outdoor unit decides the space operation
mode. Mind that the operation mode on each external room thermostat and
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]
0 (Leaving water): Unit operation is
decided based on the leaving water
temperature.
Number of water temperature zones:
▪ #: [4.4]
▪ Code: [7-02]
0 (Single zone): Main
6.2.3 Multiple rooms – TwoLWT zones
If the heat emitters selected for each room are designed for different leaving water
temperatures, you can use different leaving water temperature zones (maximum
2).
In this document:
▪ Main zone = Zone with the lowest design temperature in heating, and the highest
design temperature in cooling
▪ Additional zone = Zone with the highest design temperature in heating, and the
lowest design temperature in cooling
CAUTION
If there is more than one leaving water zone, ALWAYS install a mixing valve station in
the main zone to decrease (in heating)/increase (in cooling) the leaving water
temperature when the additional zone has demand.
Typical example:
Room (zone) Heat emitters: Design temperature
Living room (main zone) Underfloor heating:
▪ In heating: 35°C
▪ In cooling
(a)
: 20°C (only refreshment,
no real cooling allowed)
Bed rooms (additional zone) Fan coil units:
▪ In heating: 45°C
▪ In cooling: 12°C
(a)
In cooling mode, you can allow the underfloor heating (main zone) to provide refreshment
(no real cooling), or NOT allow it. See setup below.
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