Setting Up The Space Heating/Cooling System; Multiple Rooms - Two Lwt Zones - Daikin EHFZ03S18DJ3V Installer's Reference Manual

6 | Application guidelines

6.2 Setting up the space heating/cooling system

6.2.1 Multiple rooms – Two LWT zones
Installer reference guide
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NOTICE
Certain types of fan coil units –in this document referred to as "heat pump
convectors"–, are able to receive input of the indoor unit operation mode (cooling or
heating X2M/3 and X2M/4) and/or to send output of the heat pump convector
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 heat pump convector
has such features and the signals meet following requirements:
▪
Output of indoor unit (input to heat pump convector): cooling/heating
signal=230 V (cooling=230 V, heating=0 V).
▪
Input to indoor unit (output of heat pump convector): 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 the
leaving water temperature control on user interface of the unit is turned 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 auto emergency [A.6.C] to 1.
NOTICE
An overpressure bypass valve can be integrated in the system. Keep in mind that this
valve might not be shown on the illustrations.
This unit is designed to deliver water at 2 different temperatures. A typical
installation consists of underfloor heating at a lower temperature and radiators at
a higher water temperature.
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
ERLA03DAV3 + EHFZ03S18DJ3V
Daikin Altherma 3 R F
4P596821-1B – 2021.10