Vertiv Liebert PCW - Page 29

A - 1
Enclosure A - Electrode Humidier
Liebert PCW - UM - 273895 - 04.10.2018
A.1 - Electrode humidier
The operation of immersed electrode humidiers is based on a very simple physical principle. As common drinking water contains a cer-
tain quantity of dissolved mineral salts, and is consequently slightly conductive, applying a voltage to metal electrodes immersed in the
water creates an electric current that heats the water until producing steam (Joule e󰀨ect). The quantity of steam produced is proportional
to the electric current, which is in turn proportional to the level of water.
In order to obtain optimum performance from the humidier it is advisable to read this manual carefully.
Tab. 1 - Humidair specications
For humidier current (FLA) and rated power, refer to electrical features in the Enclosure B.
(*) Unit is factory- set to produce about 70% of the maximum value (see iCOM manual).
A.2 - Installation
The humidier is supplied already mounted within the air conditioner. The only necessary operations are the connections for the supply
water and drain water.
Supply Water.
Only use mains drinking water with:
• Pressure between 0.1 and 0.8MPa (1 and 8 bars), temperature between 1 and 40° C and an instant ow rate no higher than the rated
ow of the ll solenoid valve, the connection is R ¾ (ISO 7/1);
• Hardness no greater than 400 ppm of CaCO
3
(40 ° fH), conductivity range: 75- 1250 μS/cm;
(1)= values depend on the specic conductivity; in general: CR ≈0.65 * σR, 20 ° C; R180 ≈0,93 * σR, 20 ° C
(2) = not less than 200% of the chloride content in mg/l CL-
(3) = not less than 300% of the chloride content in mg/l CL-
There is not reliable relationship between hardness and conductivity of the water
Important:
• Do not treat the water with softeners, this may cause the entrainment of foam, a󰀨ecting the operation of the unit;
• Do not add disinfectants or anticorrosive compounds to the water, as these are potential irritants;
• The use of well water, industrial water or water from cooling circuits and, in general,any potentially chemically or bacteriologically
contaminated water is not recommended.
Connection:
For the supply water connection see the details in Fig1. (point11- 14)
Drain Water.
• This contains the same substances dissolved in the supply water, however in larger quantities;
• It may reach a temperature of 100 ° C;
• It is not toxic and can be drained into the sewerage system, category 3, EN 1717.
HUMIDAIR
MODEL
MAIN POWER
SUPPLIES
(V ± 10%)
SETTING
[kg/h] *
ABSORBED
CURRENT
[A]
POWER
[kW]
MAX.
CYLINDER
WATER
VOLUME
[l]
MAX. SUPPLY WATER
QUANTITY
[l/min.]
MAX. DRAIN WATER
QUANTITY
[l/min.]
KUEC2E 400V / 3ph / 50Hz 3.9...13.0 13.0 9.0 5.5 0.6 10.0
no organic compounds. supply water
characteristics
unit of measure
normal water water with low salt content
min. max min. max.
Hydrogen ions (pH) 7 8.5 7 8.5
Specic conductivity at 20° C(σR, 20 ° C) ) (σR, 20 ° C)) S/cm 350 1250 75 350
Total dissolved solids(cR) mg/l (1) (1) (1) (1)
Dry residue at 180° C(TH) mg/l (1) (1) (1) (1)
Total hardness mg/l CaCO
3
100 (2) 400 50 (2) 160
Temporary hardness mg/l CaCO
3
60 (3) 300 30 (3) 100
Iron + Manganese mg/l Fe+Mn = 0.2 = 0.2
Chlorides ppm Cl- = 30 = 20
Silica mg/l SiO
2
= 20 = 20
Residual chlorine mg/l Cl
2
= 0.2 = 0.2
Calcium sulphate mg/l CaSO
4
= 100 = 60
Metallic Impurities mg/l 0 0 0 0
Solvents, thinners, detergents, lubricants mg/l 0 0 0 0