Installation; Installing The Unit - Daikin FWN-Serie Installations- Und Bedienungsanleitung

i
nstallation
The FWN air conditioning and hot-air heating units may be installed either in ho-
rizontal or vertical position. Check that the desired installation complies with
one of the pictures shown in figure 3 in which both possible configurations (AA
or AB) are suitable to work for heating and cooling.
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.
Horizontal or vertical installation
(See figure 3)
AA Inlet and outlet of air are in a straight line
AB Inlet of air is not in a straight line with the outlet of air
Configuration of the unit
The units are always supplied in AA configuration, but the air inlet position may be
changed during the installation.
Description of the kit (See figure 6)
1 Upper closing panel
2
Lower closing panel
3
Pre-sheared element for external air inlet
4
Centrifugal fans
5
Standard heat exchanger
6
Additional heat exchanger (DF)
7
Condensate tank for wall mounting (tube Ø3/8")
8
Condensate tank for ceiling mounting (tube Ø3/8")
9
Heat exchanger hydraulic attachments
10
Condensate discharge attachments
11
Terminal strip
12
Load-bearing structure
It is advisable to install any accessories on the standard equipment before positio-
ning it, referring to the technical sheets.
The sections of the inlet and delivery pipes are rectangular and drilled with holes for
fixing the available accessories. A round pre-sheared element (Ø100 mm) is present
on both side panels of the unit for the direct inlet of fresh air.
If the installation differs from the supply terms, the layout must be changed by di-
smantling the unit as shown in figure 6.
It is possible to orient the exchanger's attachments on the opposite side as
follows:
1 remove the upper and lower closing panels (1+2),
2 remove the condensate tank for the horizontal installation (8),
3 loosen the 4 fixing screws of the motor support, without unscrewing them all
the way (7),
4 remove the heat exchanger (5) by unscrewing the 4 fastening screws, pull it
out and turn it; eliminate the pre-sheared elements on the opposite side pa-
nel, re-insert the heat exchanger and tighten the screws,
5 reassemble the previously listed components,
FWN
Ducted fan units
4PW17549-3N
6 stop the outlet holes of the previously used manifolds with anticondensing
insulating material.

Installing the unit

Fix the standard unit to the ceiling or wall using at least 4 of the 6 slots;
n For horizontal installation (ceiling mounting) it is advisable to use M8 thre-
aded bars, screw anchors suitable for the unit's weight and to arrange for the
positioning of the unit using 2 M8 bolts and a washer the diameter of which
is suitable for inserting the slot and for then fixing the unit.
Before tightening the check nut, adjust the closing of the main nut so that the
unit will slant correctly, i.e. for facilitating the discharging of the condensate
(see figure 4).
The correct slant is achieved by tilting the inlet downwards as compared to
the outlet until a difference in level of about 10 mm is obtained from one end
to the other. Make the hydraulic connections with the heat exchanger and, for
cooling operations, with the condensate discharge. Use one of the 2 drains
of the auxiliary tank, visible on the outside of the unit's side panels (see figu-
re 5): horizontal (tank) and vertical condensate discharge.
n For vertical installations (wall mounting), fix the unit so that water flow out
toward the condensate discharge used. A slant equivalent to a difference in
level between the two side panels of about 5 mm is enough.
The two condensate discharge tubes of the main tank are located inside the
side panels and may be accessed through a membrane type passage that
should be perforated for passing the discharge tube through it.
It is advisable not to remove the aforesaid membrane type passage because
it prevents the sharp edge of the hole on the side panel from damaging the
condensate discharge tube over time.
n To connect the unit to the condensate discharge line, use a flexible rubber
tube and fix it to the chosen discharge tube (Ø3/8") by means of a metal clamp
(use the discharge that is located on the hydraulic attachments side).
To assist the draining of the condensate, slant the discharge tube downwards
by at least 30 mm/m making sure that its entire route is clear and free from
bends or blockages.
n Installation of air filter. For inlet, the filter module may be installed either in
the same line as the outlet (configuration AA) or at 90° as compared to the
unit (configuration AB). In the latter case the front lower closing panel must
be moved by adjusting the 6 screws that fix it to the unit. The panel will then
be installed at the bottom of the unit.
Both ends of the filtering module are drilled to match the holes on the intake
inlet of the unit.
As such, it will be possible to couple the module to the unit and achieve, at
the other end, a positioning of the holes that is identical to that of the intake
inlet of the air handling unit.
The drilled holes at one end of the module are Ø5 mm; this is the part that is
to be coupled directly to the unit.
At the other end the diameter of the holes is 3.5 mm to ensure that the
screws, which will be used for fixing other parts (field supply) will be tight.
The overall dimensions are shown in figure 2.
Installation and operation manual
2