Carel MCmultizone, User Manual

Page: 42 / 52

42
ENG
“MCmultizone” +030221981 - rel. 2.3 - 09.12.2014
cabinet
distribution
maint
enanc
e
14.2 Important rules to be followed
1. The minimum distance between two adjacent heads must never be
less than 100 mm. This is also the minimum distance between the
heads at the end and the side of the duct.
2.
To determine the distance between heads, divide the width of the
duct by the number of heads plus one. If the distance is less than
100mm, more manifolds should be used, and if possible, larger
capacity heads.
3. If the height of the duct (D) is greater than::
D = 2 x H + 100 mm
(where H is the maximum distance in mm reached by the jet sprayed
by the heads to the top of the duct, as in Table 4), then the manifold
can be placed in the centre of the duct with the heads facing
alternately up and down.
4. The minimum height of the duct (M) to be able to install the
distribution manifold with a 90° jet is equal to:
M = H + 180 mm
If this space is not available, then the heads must be installed outside
of the duct with the jet spraying inside (Fig. 14.c) or lower capacity
heads used.
5. The jet of atomised water must never come into contact with
obstacles (wall reinforcement bars) before total evaporation (free
path of evaporation - PL).
6. Never fi t the heads in the opposite direction to the air fl ow.
7.
If the fi lling and washing functions are featured, install the NO
drain solenoid valve supplied as an option at the end of the line.
The drain hose connected downstream of the solenoid valve must
have a diameter that is greater than or equal to diameter of the line
upstream. If this is not installed, fi t an easily accessible ball valve for
cleaning (bleeding) the line when commissioning and restarting
each season.
8. At the end of the air line, an easily accessible ball valve should be
fi tted for cleaning (bleeding) the line when commissioning and
restarting each season.
9.
To control the pressure in the air line, use one of the following devices,
installed at the end of the line:
Pressure gauge (supplied as an option)
Pressure transducer (supplied as an option)
With the devices listed above, depending on the type of cabinet
used, refer to the following:
for ON/OFF cabinets:
•
With a pressure gauge installed at the end of the line, the pressure
drop in the line can be displayed and, if necessary, the pressure
increased to 2.1 bars using the manual pressure regulator located
inside the cabinet.
•
With the pressure transducer, the pressure at the end of the line
can be shown on the controller display and, if necessary, increased
using the manual pressure regulator.
for cabinets with modulating control:
•
With a pressure gauge installed at the end of the line, the pressure
at the end of the line can be read and, if necessary, increased using
the corresponding parameter on the electronic controller.
•
With the pressure transducer, the cabinet automatically controls
the pressure in the installation to the optimum value so as to
compensate for any pressure drop in the line.
14.3 Positioning the humidity probes
If installing humidity and temperature probes:
•
The ambient humidity control probe must be located inside the
return air duct. This sensor can also be positioned in the room being
humidifi ed. Make sure, however, that the place where it is installed is
away from fl ows of air that are hotter or colder than the environment,
or is not in contact with perimeter walls.
•
The temperature probe must follow the same rules as described above
for the humidity probe.
•
The high humidity limit probe should be located downstream of the
atomisation manifold in a position where it cannot be wet by the jet of
atomised water (e.g. after the cooling coil, or after a droplet separator,
or near the fan).
14.4 Manifolds for installation in ducts
Special manifold kits are available for installations in ducts, sized according
to the number of atomising heads required and the dimensions of the
AHU/ducts.