Installation and operation manual
6
HXY48TAVJU
VRV System indoor unit
3P616151-1A – 2021.12
Drain pan kit (EKHBDPCA2)
The drain pan is required to drain accumulated condensation from
the indoor unit. It is required during low temperature cooling
operation of the indoor unit and when the leaving water temperature
is <64°F (18°C).
For installation of this option into the indoor unit, refer to the
installation manual delivered with this option kit.
Demand PCB (EKRP1AHTA)
An optional EKRP1AHTA demand PCB can be connected to the
indoor unit. This PCB is needed when an external room thermostat is
installed and provides the communication with the indoor unit.
Refer to the demand PCB installation manual for further details.
Refer to the wiring diagram or connection diagram for connecting this
PCB to the unit and "7.3.5. To connect the electrical wiring on the
indoor unit" on page 15.
4.3.2.
Possible combinations of indoor unit and outdoor unit
5.
Application guidelines
5.1.
Overview: Application guidelines
The purpose of the application guidelines is to give a glance of the
possibilities of the Daikin heat pump system.
This chapter contains applications guidelines for:
Setting up the space heating/cooling system
Setting up an auxiliary heat source for space heating
5.2.
Setting up the space heating/cooling system
The Daikin 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 Daikin
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, Daikin
recommends to follow the setup guidelines below.
5.2.1.
Single room
Under floor heating or heat pump convector – Wired room
thermostat
Setup
A
Main leaving water temperature zone
B
One single room
C
One single room
a
Outdoor VRV
b
VRV Direct Expansion (DX) Indoor unit cassette
c
HXY48
d
Optional EKRUAHTB user interface (main)
e
Refrigerant piping
f
Water piping
g
Floor heating loop
h
Fan coil unit
i
Bypass valve (field supply)
j
User interface (sub)
The under floor heating or heat pump connection is directly
connected to the indoor unit.
The room temperature is controlled by the user interface, which
is used as room thermostat. Possible installations:
User interface (standard equipment) installed in the room and
used as room thermostat
User interface (standard equipment) installed at the indoor
unit and used for control close to the indoor unit + user
interface (optional equipment EKRUAHTB) installed in the
room and used as room thermostat
Benefits
Cost effective
.
You do NOT need an additional external room
thermostat.
High comfort and efficiency
. The smart room thermostat
functionality can decrease or increase the desired leaving water
temperature based on the actual room temperature
(modulation). This results in:
Stable room temperature matching the desired temperature
(higher comfort)
Less ON/OFF cycles (more quiet, higher comfort and higher
efficiency)
Lowest possible leaving water temperature (higher efficiency)
Easy
. You can easily set the desired room temperature via the
user interface:
For your daily needs, you can use preset values and
schedules.
To deviate from your daily needs, you can temporarily
overrule the preset values and schedules.
INFORMATION
For detailed information, refer to the VRV heat pump
combination table in Technical Data. Combinations are
explained depending on the system layout of the VRV heat
pump series.
NOTE
The illustrations in the application guidelines are
meant for reference only, and are NOT to be used as
detailed hydraulic diagrams. The detailed hydraulic
dimensioning and balancing are NOT shown, and are
the responsibility of the installer.
For more information about the configuration settings
to
optimize
heat pump
operation,
see
the
configuration chapter.
C
B
A
d
B
A
d
b
e
c
f
f
i
i
j
a
g
h
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