Air Connections; Channel Fastening; Cannel Air Side Pressure Drops; Air Delivery For Under Machines - Mitsubishi Electric w-MEXT 006 Installations, Bedienungs Und Wartungsanleitungen

w-MEXT
2.6

AIR CONNECTIONS

The sizing of the ducts must be defined during the system design stage.
AIR DELIVERY CHANNEL FOR OVER MACHINES
Air delivery channel
Front
panel
Air delivery
channel
fastening frame
Air delivery channel fastening frame
AIR DELIVERY CHANNEL FASTENING (OVER VERSION)
Size F1
510
A mm
410
B mm
2.6.1

CHANNEL FASTENING

Air delivery duct (not supplied).
Fix the air delivery duct to the anti-
vibration joint as shown in the figure
(fastening system not supplied).
Interpose a gasket as shown in the figure
(not supplied)
Anti-vibration joint (not supplied).
The anti-vibration joint prevents the
transmission of vibrations to the ducts.
Machine panel
Upper machine frame.
Secure the anti-vibration
joint to the machine frame
using self-tapping screws
as shown in the figure.
Interpose a gasket as
shown in the figure (not
supplied).
OBLIGATION
Make sure that the weight of the channel is not supported by
the machine support frame
UM_w-MEXT_01_Z_10_20_ML
Anti-vibration joint
F2
910
410
Gaskets
Gaskets
Machine frame
2.6.2

CANNEL AIR SIDE PRESSURE DROPS

The useful nominal and maximum static pressure values of the machine are
indicated in the relevant Technical Bulletin.
Pressure drops in the ducts must be minimal; high values will cause an increase in
electricity consumption of the fans.
2.6.3

AIR DELIVERY FOR UNDER MACHINES

The arrangement of the air delivery system in the raised floor must be defined during the
system design stage.
The useful nominal and maximum static pressure values of the machine are
indicated in the relevant Technical Bulletin.
Pressure drops in the raised floor must be minimal; high values will cause an increase in
electricity consumption of the fans.
2.7

STEAM MODULATING HUMIDIFIER (ACCESSORY)

Submerged electrode steam modulating humidifier with electronic control, with modulating
steam delivery and complete with safety and operation devices
The metal cover above the boiler ensures high safety levels during operation.
UL94 Flame resistant safety standard: V0
The accessory includes the combined air return temperature/humidity probe and the control
card.
Water filling and discharge pipes from the humidifier are not supplied.
It is recommended that a filter and a shut-off tap are installed on the water filling piping.
This humidifier produces unpressurised steam thanks to the electrodes submerged in the
water in the cylinder: they take the electric phase to the water, which works as an electric
heater and overheats. The produced steam is then used to humidify industrial processes or
environments through appropriate distribution systems.
The humidifier's water intake connection is 3/4" G M – ISO 228/1 and it's water discharge
connection is 32 mm M smooth pipe.
2.7.1

CHARACTERISTICS OF THE SUPPLY WATER

The quality of the water used affects the evaporation process. The humidifier can be
supplied with untreated water, provided that it is drinking and non-demineralized water.
Hydrogen ion activities
Specific conductivity at 20 °C
Total dissolved solids
Fixed residue at 180 °C
Total hardness
Temporary hardness
Iron + Manganese
Chlorides
Silica
Residual chlorine
Calcium sulphate
Metal impurities
Solvents, diluents, soaps, lubricants
(1) Values depending on specific conductivity; in general: TDS ≅ 0,93 * σ
0,65 * σ
R
(2) Not lower than 200% of the chloride content in mg/l di Cl
(3) Not lower than 300% of the chloride content in mg/l di Cl
OBLIGATION
Only use with drinking water.
• There is no reliable relationship between water hardness and
conductivity.
• The water must not be treated with softeners! This can cause
corrosion of the electrodes and the formation of foam, with
possible service irregularities.
• Do not add disinfectants or anticorrosive substances to the
water, as they are potential irritants;
• Well and industrial water, or water from the cooling circuits, is
strictly forbidden, as it is potentially polluted (chemically or
bacteriologically) water.
2.8 SUCTION PLENUM WITH DAMPER FOR FREE COOLING
(ACCESSORY)
The optional allows to obtain free-cooling by direct ambient air intake into the room.
The dampers are proportionally managed by the microprocessor control, that regulates the
quantity of the ambient air to put in the room according to the set-point.
The optional is not suitable for installation in seismic areas.
Ducting for ambient air suction has to be provided by the installer.
A rain cover with grille on ambient air intake, provided by the installer, is recommended.
Accessory available only for under and displacement versions.
26
TRANSLATION OF THE ORIGINAL INSTRUCTIONS
English
Min Max
Ph 7
σ Μs/cm 300 1250
R, 20 °C
TDS mg/l (1)
R mg/l (1)
180
TH mg/l CaCO 100 (2)
3
mg/l CaCO 60 (3)
3
mg/l Fe + Mn 0
ppm Cl 0
mg/l SiO 0
2
mg/l Cl - 0
mg/l CaSO 0
4
mg/l 0
mg/l 0
R
R, 20 °C; 180
-
-
8.5
(1)
(1)
400
300
0.2
30
20
0.2
100
0
0
≅