Daikin FWB, Installation And Operation Manual

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FWB
Ducted fan coil units
4PW24344-1C Installation and operation manual
7
Read this manual attentively before starting up the unit. Do not throw it
away. Keep it in your files for future reference.
Improper installation or attachment of equipment or accessories
could result in electric chock, short-circuit, leaks, fire or other damage
to the equipment. Be sure only to use accessories made by Daikin
which are specifically designed for the use with the equipment and
have them installed by a professional.
If unsure of installation procedures or use, always contact your Daikin
dealer for advice and information.
B
efore installation
Installation and maintenance should be carried out by technical personnel qualified
for this type of machine, in compliance with current safety regulations.
When receiving the unit please check its state, verifying if any damage occurred
during transport.
Refer to the relevant technical sheets for installation and use of possible
accessories.
Identify model and version of the unit from the indications stated on the carton
package.
U
se and operating limits
Daikin shall not be held liable
- if the unit has been installed by non-qualified personnel,
- if the unit has been used improperly,
- if the unit has been used under conditions that are not permitted,
- if maintenance operations specified in this manual have not been carried out,
- if non original spare parts have been used.
Keep the unit in its packaging until it is ready to be installed, to prevent dust getting
inside.
Air sucked by the unit must always be filtered. Always use the supplied air filter.
If the unit is not used during winter, drain the water from the system to prevent
damage caused by the formation of ice. If antifreeze solutions are used, check the
freezing point.
Do not change the internal wiring or other parts of the unit.
Operating limits are shown here below; all other uses are considered improper:
•
thermal carrier: water/glycol
• water temperature: 5°C~95°C
• maximum operating pressure: 10 bar
• air temperature: –20°C~40°C
• voltage tolerance: ±10%
• ambient air humidity limit: RH < 85 % non-condensing
Selection of location:
Equipment designed for ambient air conditioning and intended for use in civil
comfort applications
•
do not install the unit in rooms where inflammable gases are present
• do not let water spray directly on the unit;
• install the unit on ceilings that bear its weight. Leave enough space all around
for proper operation and maintenance of the unit, taking into account all
installed optional accessories.
• never place the heating unit immediately under an electric plug-socket.
d
escription of the eqUipment
The FWB range of air conditioning and hot-air heating units has been implemented
for conditioning rooms that require the installation of ducted units.
Main components
• Load bearing structure made of galvanized steel sheet of suitable thickness,
duly insulated with noise-proof/anti-condensing material, self-extinguishing
in class 1. The unit is equipped with 4 anti-vibration isolators.
• Fan unit with single, dual or triple fan wheel, dual intake centrifugal type, with
statically and dynamically balanced impellers, coupled directly, equipped
with permanently fit condenser and thermal safety device
• Switch box located at the side of the hydraulic connections in order to reduce
the service space. Electric connection by means of screw terminal strip.
• High efficiency 3, 4 or 6 row heat exchanger, made of copper tube and
aluminium fins secured to the tubes by mechanical expansion. They are fit
with brass manifolds and contain air valves. The heat exchanger, normally
supplied with left-hand attachments, may be turned 180°.
• System for collecting and discharging condensate, extending beyond the
hydraulic connections, enabling collection of condensate from regulating
valves eventually. The off-centre position considerably reduces the required
installation space.
• Air filter made of acrylic material, self-extinguishing in class 1, with filtering
class EU 2. The removable cassette-type filter is positioned on the air
suction inlet and can be pulled out from below like a drawer.
• Straight duct connectors on both the air intake and air outlet.
d
imensions
• Standard unit (See figure 1)
1 Water outlet, 3/4” female gas
2
Water inlet, 3/4” female gas
3 Switch box
4 Power supply cable intake holders
5 Condensate drain connection Ø17 mm
• Air filter (See figure 2)
i
nstallation
The FWB air conditioning and hot-air heating units, the circuit breaker (IL) and/
or the remote control must be installed out of reach of persons who may be
taking a bath or shower.
In normal operation, particularly with the fan at minimum speed and ambientair
with high relative humidity, condensation may form on the air outlet and on
some external parts of the unit. To avoid such issues while always remaining
within the operating limits envisaged for the unit, it is necessary to limit the
(average) temperature of the water inside the heat exchanger. In particular, the
difference between the air dew point (TA,DP) and the average water
temperature(TWM) must NOT exceed 14 °C, according to the following
relationship:
TW>TA,DP-14 °C
Example: in the case of ambient air at 25 °C with 75 % relative humidity, the dew
point value is about 20 °C and, therefore, the average temperature of the water in
the coil must be greater than 20 - 14 = 6 °C in order to avoid condensation
issues. In the event the indoor unit is stopped for a prolonged period, with the
fan stopped and circulation of cold water in the heat exchanger, condensation
may also form on the unit’s exterior. In this case it is advisable to install the
3-way (or 2-way) valve accessory in order to stop the flow of water in the coil
when the fan is stopped.
FWB
Ducted fan coil units
Installation and
operation manual