Setting Up The Space Heating/Cooling System - Daikin EWYA004D2V3P Installer's Reference Manual

6.2 Setting up the space heating/cooling system

EWAA004~008D + EWYA004~008D
Packaged air-cooled water chillers
and packaged air to water heat pumps
4P688013-1B – 2022.09
NOTICE
Certain types of fan coil units are able to receive input of the outdoor unit operation
mode (cooling or heating X2M/3 and X2M/4) and/or to send output of the fan coil
unit thermostatic condition (main zone: X2M/30 and X2M/35; additional zone:
X2M/30 and X2M/35a).
The application guidelines illustrate the possibility of receiving or sending digital
input/output. This functionality can only be used in case the fan coil unit has such
features and the signals meet following requirements:
▪
Output of outdoor unit (input to fan coil unit): cooling/heating signal=230 V
(cooling=230 V, heating=0 V).
▪
Input to outdoor unit (output of fan coil unit): thermostat ON/OFF signal=voltage-
free contact (closed contact=thermo ON, open contact=thermo OFF).
The heat pump system supplies leaving water to heat emitters in one or more
rooms.
Because the system offers a wide flexibility to control the temperature in each
room, you need to answer the following questions first:
▪ How many rooms are heated or cooled by the heat pump system?
▪ Which heat emitter types are used in each room and what is their design leaving
water temperature?
Once the space heating/cooling requirements are clear, we recommend to follow
the setup guidelines below.
NOTICE
If an external room thermostat is used, the external room thermostat will control the
room frost protection. However, the room frost protection is only possible if [C.2]
Space heating/cooling=On.
INFORMATION
In case an external room thermostat is used and room frost protection needs to be
guaranteed in all conditions, then you have to set Emergency [9.5.1] to one of the
following:
▪
Automatic
▪
auto SH reduced/DHW off
NOTICE
A differential pressure bypass valve can be integrated in the system. Keep in mind
that this valve might not be shown on the illustrations.
6 Application guidelines
|
Installer reference guide
25