Multiple Rooms - Two Lwt Zones - Daikin EWYA004D2V3P Installer's Reference Manual

6.2.3 Multiple rooms – Two LWT zones
EWAA004~008D + EWYA004~008D
Packaged air-cooled water chillers
and packaged air to water heat pumps
4P688013-1B – 2022.09
▪ 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
Unit temperature control:
▪ #: [2.9]
▪ Code: [C-07]
Number of water temperature zones:
▪ #: [4.4]
▪ Code: [7-02]
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
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)
Living room (main zone)
Bed rooms (additional zone)
(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.
Setup
Three bizone kit system variations are possible:
1 System without hydraulic separator:
6 Application guidelines
|
Value
0 (Leaving water): Unit operation is
decided based on the leaving water
temperature.
0 (Single zone): Main
Heat emitters: Design temperature
Underfloor heating:
▪ In heating: 35°C
(a)
▪ In cooling : 20°C (only refreshment,
no real cooling allowed)
Fan coil units:
▪ In heating: 45°C
▪ In cooling: 12°C
Installer reference guide
33