Air Connections; Channel Fastening; Cannel Air Side Pressure Drops; Air Delivery For Under Machines - Mitsubishi Electric s-MEXT 006-044 Installations, Bedienungs Und Wartungsanleitungen

s-MEXT
2.6

AIR CONNECTIONS

The sizing of the ducts must be defined during the system design stage.
INFORMATION
For the size F3 Over, allow for a channel that can be frontally
inspected at the top, should it become necessary to handle (remove)
the air treatment centrifugal fan.
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
OBLIGATION
Make sure that the weight of the channel is not supported by
the machine support frame
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.
Gaskets
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).
Machine frame
UM_s-MEXT_01_Z_03_19_ML
Anti-vibration joint
F2 F3
910 910
410 800
Gaskets
OBLIGATION
Make sure that the weight of the channel is not supported by
the machine support 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.
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
(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.
3

PRE-COMMISSIONING

3.1

BEFORE STARTING THE MACHINE

Before contacting the Specialist Engineer, who will execute the first commissioning running
test, the Installer must carefully check that the installation complies with the requirements
and specifications set-out during the design stage, making sure:
• that the electrical connection is correct, and that it guarantees compliance with the
current Electromagnetic Compatibility Directive.
• that the cooling connection to the condensing unit is correctly terminated;
23
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 ≅ 0,65 * σ
R, 20 °C; 180
-
-
8.5
(1)
(1)
400
300
0.2
30
20
0.2
100
0
0
R