Daikin EWYA004D2V3P Installer's Reference Manual page 37

EWAA004~008D + EWYA004~008D
Packaged air-cooled water chillers
and packaged air to water heat pumps
4P688013-1B – 2022.09
▪ Space heating can be done by:
- The outdoor unit
- An auxiliary boiler (field supply) connected to the system
▪ When the room thermostat requests heating, the outdoor unit or the auxiliary
boiler starts operating depending on the outdoor temperature (status of the
changeover to external heat source). When the permission is given to the
auxiliary boiler, the space heating by the outdoor unit is turned OFF.
▪ Bivalent operation is only possible for space heating.
INFORMATION
▪
During heating operation of the heat pump, the heat pump operates to achieve
the desired temperature set via the user interface. When weather-dependent
operation is active, the water temperature is determined automatically
depending on the outdoor temperature.
▪
During heating operation of the auxiliary boiler, the auxiliary boiler operates to
achieve the desired water temperature set via the auxiliary boiler controller.
Setup
▪ Integrate the auxiliary boiler as follows:
A
A Main leaving water temperature zone
B One single room
a User interface (delivered as accessory)
b Dedicated Human Comfort Interface (BRC1HHDA used as room thermostat)
c Non-return valve (field supply)
d Shut-off valve (field supply)
e Auxiliary boiler (field supply)
f Aquastat valve (field supply)
NOTICE
▪
Make sure the auxiliary boiler and its integration in the system complies with
applicable legislation.
▪
Daikin is NOT responsible for incorrect or unsafe situations in the auxiliary boiler
system.
B
f
d
e
d
c
c
a
6 Application guidelines
|
b
Installer reference guide
37