Daikin FWD04ACTN6V3, Installation And Operation Manual

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FWD
Ducted fan units
4PW17549-3
Installation and operation manual
d
imensions
• Intake module with flat filter class EU 2 (See figure 2)
• Standard unit (See figure 5)
The dimensions mentioned on the left side are related to left-hand
hydraulic attachments and the dimensions mentioned on the right
side are related to right-hand hydraulic attachments.
1 6 fast-coupling slots
2
Condensate discharge - horizontal installation
3
Condensate discharge - vertical installation
4
Hydraulic connections
4 = standard heat exchanger
4 DF = additional heat exchanger
5
Air delivery
6
Air intake
6A = supply terms
6B = changeable during installation
7
Round pre-sheared element (Ø100 mm) for fresh air intake
i
nstallation
The FWD air conditioning and hot-air heating units may be installed
either in horizontal or vertical position. Check that the desired instal-
lation complies with one of the pictures shown in figure 3 in which
both possible configurations (AA or AB) are suitable to work for hea
-
ting 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 posi -
tion 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 be-
fore positioning 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 chan-
ged by dismantling 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 panel,
re-insert the heat exchanger and tighten the screws,
5 reassemble the previously listed components,
6 stop the outlet holes of the previously used manifolds with anticondensing in-
sulating material.
Installing the unit
Fix the standard unit to the ceiling or wall using at least 4 of the 6 slots;
• For horizontal installation (ceiling mounting) it is advisable to use M8
threaded bars, screw anchors suitable for the unit’s weight and to
arrange for the positioning of the unit using 2 M8 bolts and a wa-
sher 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 com-
pared to the outlet until a difference in level of about 10 mm is obtai-
ned from one end to the other. Make the hydraulic connections with
the heat exchanger and, for cooling operations, with the condensa-
te discharge. Use one of the 2 drains of the auxiliary tank, visible on
the outside of the unit’s side panels (see figure 5): horizontal (tank)
and vertical condensate discharge.
• 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.
• 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 me -
tal clamp (use the discharge that is located on the hydraulic at -
tachments 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.
• Installation of air filter. For inlet, the filter module may be installed ei -
ther 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.
2