Daikin EWYA004D2V3P Installer's Reference Manual page 35

EWAA004~008D + EWYA004~008D
Packaged air-cooled water chillers
and packaged air to water heat pumps
4P688013-1B – 2022.09
b Dedicated Human Comfort Interface (BRC1HHDA used as room thermostat)
c Mixing valve station
d Pressure regulating valve (field supply)
e Safety thermostat (field supply)
f Bizone kit control box (EKMIKPOA)
g Bypass valve
h Hydraulic separator (balancing bottle)
i Direct pump (for additional zone) (e.g. unmixed pump group EKMIKHUA)
INFORMATION
A pressure regulating valve should be implemented before the mixing valve station.
This is to guarantee the correct water flow balance between the main leaving water
temperature zone and the additional leaving water temperature zone in relation to
the required capacity of both water temperature zones.
▪ A bypass valve must be installed to make water recirculation possible when all
shut-off valves are closed. To guarantee reliable operation, provide a minimum
water flow as described in table "To check the water volume and flow rate" in
"8.1 Preparing water piping" [
▪ 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
Unit temperature control:
▪ #: [2.9]
▪ Code: [C‑07]
Number of water temperature zones:
▪ #: [4.4]
▪ Code: [7‑02]
6
|
4
59].
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
thermostat functionality
1 (Dual zone): Main + additional
Application guidelines
Value
= external room
Installer reference guide
35