Accessories; Humidifier - Mitsubishi Electric MULTIDENSITY 009 Installations, Bedienungs Und Wartungsanleitungen

MULTIDENSITY
3

ACCESSORIES

3.1

HUMIDIFIER

Upon request, the air-conditioning unit can be fitted with an immersed electrode humidifier:
HUMIDIFIER OPERATING PRINCIPLE
In the immersed electrode humidifier, the current that runs between the electrodes, through
the water contained in the boiler cylinder, generates the heat required to boil the water.
By controlling the level of the water and the concentration of salts inside the steam cylinder
(6) using the fill (7) and drain (8) solenoid valves, the amount of current delivered can be
regulated, and measured using a current transformer (2).
When steam production is required, the humidifier contactor closes (see the wiring diagram)
to supply power to the immersed electrodes.
When the current falls below the set value due to the lowering of the water level, the fill
valve (7) is opened.
The drain valve (8) is activated cyclically, depending on the characteristics of the supply
water, so as to maintain the optimum salt concentration inside the cylinder (6).
The only periodical maintenance operations required are the inspection and cleaning of the
parts in the steam production unit. The operations indicated below should be performed
annually, preferably before shutting down the unit in summer.
STEAM CYLINDER
The steam cylinder requires periodical cleaning to remove the scale deposits that form on
the surface of the electrodes and the flakes that deposit on the filter at the base of the
cylinder.
To remove the cylinder, proceed as follows:
- completely drain the water from the boiler; to do this, see the paragraph "MANUAL
CONTROL" on the Technical Manual for the EVOLUTION+ MULTIDENSITY;
- disconnect the power supply by opening the main switch on the additional rear
electrical panel;
- remove, from the top of the cylinder, the hose that carries the steam to the distributor;
- disconnect the power connections by unscrewing the knobs on the cable ends and
remove the plugs from the level electrodes;
- release the strap that secures the cylinder to the unit;
- slide the cylinder out upwards.
The steam cylinder can be reused several times after cleaning the electrodes: if, however,
the wear on the grills of electrodes is such that these cannot be regenerated, they must be
replaced. The only spare part is the complete cylinder body (with filter included).
UM_MULTIDENSITY_00_Z_09_20_ML
3
4
1 Humidifier interface board:A3;
6
(inside the electrical panel).
2 Current transformer TA1 (inside
the electrical panel) for measuring
the current input of the steam
cylinder.
3 Water fill tank.
4 High water level electrodes in the
7
steam cylinder.
5 Overflow pipe (BEHIND THE
CYLINDER).
8
6 Boiler cylinder (or steam cylinder).
7 Water fill solenoid valve:YV1.
8 Cylinder drain solenoid
valve:YV2.
9 Microprocessor control board: B1
10 Temperature and humidity probe:
BH1.
Position: V-F
OUT Ф32mm
IN 3/4"G Ф6mm
FILL AND DRAIN ASSEMBLIES
To ensure the correct operation of the humidifier, the supply/fill and drain assemblies need
to be inspected periodically.
Proceed as follows:
- completely drain the water from the boiler using the MANUAL CONTROLS;
- disconnect the power supply by opening the main switch on the electrical panel;
- remove the fill pipe from the 3/4 GAS fitting on the fill solenoid valve;
- remove and clean the filter located inside the solenoid valve fitting;
- dismantle the drain assembly (shown in Figure 13), clean the pipes and remove any
flakes of scale from the cup-drain trap.
HUMIDIFIER POWER SUPPLY
Underneath the fill solenoid valve on the steam production unit is the threaded male fitting
(V) for the humidifier water supply. This is already fitted with a plastic hose, diameter 6 mm,
for connection to the building's water supply (see figure, point F).
V: Steam production unit - inlet connection (threaded male fitting 3/4"G);
F: Rubber hose, diameter: Ф 6mm.
To supply the humidifier, use drinking water without any chemical treatment or
demineralisation.
The characteristics of the water that supplies the humidifier must be within the values below:
LIMIT VALUES FOR IMMERSED ELECTRODE
HUMIDIFIER FEED WATER
Mains pressure
Hydrogen ions
Specific conductivity at 20°C
Total dissolved solids
Dry residue at 180°C
Total hardness
Temporary hardness
Iron + Manganese
Chlorides
Silica
Residual chlorine
Calcium sulphate
Metallic impurities
Solvents, diluents, soaps,
lubricants
(1) Values depending on specific conductivity; in general: TDS ≅ 0,93 * σ
0,65 * σ
R
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.
HUMIDIFIER
A rubber or plastic hose should be used, resistant to 100°C, with an inside diameter of 32
mm. Fit a trap in the section of the hose outside of the unit to avoid bad odours and to
prevent water from overflowing from the humidifier pan. During installation, pour water into
the condensate collection pan and the humidifier pan, in order to fill the drain traps outside
and inside the unit with water. Downstream of the drain trap ensure a minimum slope of 1%.
ATTENTION
The water exiting the steam cylinder is very hot. The humidifier
drain hose must not be fastened to electrical cables and must run
down vertically in order to avoid any contact with these cables.
25
English
Normal water
Min
bar 1
pH 7
σ μS/cm 350
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
ORIGINAL INSTRUCTIONS
Max
8
8,5
1250
(1)
(1)
400
300
0,2
30
20
0,2
100
0
0
R
≅
R, 20 °C; 180