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GB.BCHA455.050101
Specifications are subject to alteration without notice.
2.1 General
The humidifier should be installed in wet areas with floor
gulley and should preferably be located upstream of the air
cooler, if there is one.
2.1.1 Humidifier selection
The following recommendations apply to the water quality,
type of installation and control equipment in conjunction with
selecting a humidifier (see also Sections 2.2-2.5):
2.1.2 Symbols used and technical correlation
The chart (right) shows the humidification process with
water having the same temperature as the wet-bulb tem
-
perature t
v
.
The humidifiers should be connected to a cold water supply.
Any change of enthalpy will then be negigible, even though
the water supplied has a slightly lower temperature than the
wet-bulb air temperature.
Degree of humidification b
x
=
BCHA
Instructions for the BASIC
BCHA Humidifier, Sizes 004–055
1. General
The BCHA is an evaporative humidifier designed for oncethrough water or circulated water. The water evaporates
from an unheated contact fill, consisting of an inorganically
impregnated, woven glass fibre of cross-block design.
The contact fill is incombustible and thus is not affected
by high air temperatures or high water temperatures. The
woven glass fibre is also highly water absorbent that allows
complete wetting of the surfaces.
The air flow through the humidifier must be horizontal.
The water distribution system for circulated water
consists
of water spray tubes, pump, drain valve, float valve
and
internal pipework.
The components of the BCHA are easy to reach for cleaning.
They can easily be withdrawn from the inspection door. The
water tray is made of stainless steel; has its drainage line on
the inspection side. If the drain connection at the side of the
unit is left open, it must be fitted with a type BCXZ-1-71-5
water trap.
WARNING!
Do not open the inspection doors on the pressurized
side downstream of the fan. The door may otherwise
fly open and cause personal injury.
1.1 Specification
The version, size, etc. are specified in the delivery documents.
2. Installation
Water consumption due to evaporation, E, can be calculated
as follows:
E= q · 60 · 1.2 · (x2 – x1) l/min, where q = air flow, m3/s
X
max–X1
X2–X
1
Symbols
x1 = inlet air moisture
content
x2 = outlet air moisture
content
x
max
= moisture content at
saturation point
= relative humidity
t = dry-bulb temperature
tv = wet-bulb temperature
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GB.BCHA455.050101
Specifications are subject to alteration without notice.
1,0 10 10 10 10
2 3 4
Ca mg/l
2+
2,5 25 250 2500 25000
Ca(CaCO ) mg/l
3
1,0
2,0
0,5
0,25
0,1
HCO mg/l
3
1,0
0,1
0,01
10
10
2
1,0
10
10
2
10
2
10210
3
10210
4
CO mg/l
3
2-
pH
6 7 8 9
Example
Air flow (q) = 2.4 m3/s
pH-value of cold water = 7.1
Calcium concentration (CA2+) = 100 mg/ml (100 ppm)
Bicarbonate concentration (HCO3) = 100 mg/ml (100 ppm)
Moisture content, unhumidified air (X
1
) = 0.0023 kg/kg
Moisture content, humidified air (X
2
) = 0.0110 kg/kg
The bleed-off factor f
b
= 0.3 can be read from the water quality chart.
Evaporation (E) = 2.4 · 60 · 1.2 · (0.0110 – 0.0023) = 1.50 l/min
Bleed-off (B) = f
b
· E = 0.3 · 1.50 = 0.45 l/min
Total water consumption (T) = E + B = 1.50 + 0.45 = 1.95 l/min
f
b
-Factor
Unusable water
Once through water
(Not circulating)
Water Quality Chart
2.4 Water quality - water consumption
2.4.1 Humidification by circulated water
The total water consumption is the sum of the water eva
porated (E) and the water bleed-off (B). This bleed-off is the
constant draw-off flow that is necessary to keep the concen
tration of minerals in the tray at an acceptable level.
2.3 Electrical connections
Before wiring the humidifer, remove the humidifier casettes
and run the power supply cables through the casing to the
humidifier pump and the solenoid valve. The cables must
not be run above or through the inspection door. A safety
isolating switch for the appropriate rated output and cur
rent tabulated on page 6 (Section 4.1: Electrical data) must
precede the electrical components.
Check that the pump rotates in the correct direction.
2.2 Solenoid valve
Built-in component of humidifiers controlled in two
stages.
2.5 Type of installation
If the air is highly polluted, a fine filter should be included in
the installation. Use in plants in which the air contains cellulose
dust or similar organic pollutants should be avoided.
2.4.2 Water bleed-off factor
The bleed-off factor (f
b
) can be obtained from the water
quality chart below if the water quality is known, see the
example below. If not, an analysis of the water can be made,
however it is often simpler to request analysis data from your
local municipal water authority.
If the water bleed-off factor is more than 2, it is advisable to
use once-through water instead of circulated water. As an
alternative, the water can be treated. However, don't use any
softening agent or any type of lime inhibitor in the water.
Direction of rotation
Check here
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Specifications are subject to alteration without notice.
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4
2
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5
6
2.6 Humidfication by circulated water
2.6.1 Water demand
A certain loss of water arises due to evaporation. To prevent
an increase in the concentration of minerals caused by this
loss, continuous bleed-off must take place and an equal
volume of fresh make-up water must be supplied.
A suitable water bleed-off rate is determined by the pH
value and the concentration of calcium and bicarbonate
in the water. The water bleed-off flow can be determined
by following the description under "Humidifier selection".
The water flow rate required can be set according to the
installation instructions.
2.6.2 Connecting the humidifier to the water system
The water must be of ”drinking quality”. The supply is
controlled by means of a built-in float valve.
Connect the supply pipe (1) to the float valve inlet, size 15
conn. Fit the shut-off valve (4) and a water filter (2) to the
supply pipe if the water contains impurities. The water filter
mesh should not exceed 500 µm. The shut-off valve and the
water filter are not included in the supply. The BCXZ-1-71
water trap is available as an accessory.
The outlet pipe (5) size 32R conn., is located centrally below
the inspection door. It can be fitted with a cleanable type
BCXZ-1-71 water trap (6) and must be run without any
reduction in diameter to a floor gulley.
2.7 Humidification by ”once-through water”
2.7.1 Connecting the humidifier to the mains water
system
Fit a constant-flow valve (3) to the inlet of the distribution
tube, size 15 conn. Then connect the supply pipe (1) to the
constant-flow valve. Fit a solenoid-type or motor-driven
shut-off valve (4) and a water filter (2) to the supply pipe, if
the water contains impurities. The mesh of the water filter
should not exceed 500 µm.
The outlet pipe (5), size 32R conn., is located centrally below
the inspection door. It can be equipped with a type BCXZ1-71 water trap and must be run without any reduction in
diameter, to a floor gulley.
The shut-off valve and the water filter are not included in the
supply. The BCXZ-1-71 water trap is available as an acces
sory. The constant-flow valve controls the supply of fresh
water required at a constant rate. A water softener should
be used if the water is hard.
The arrangement of fittings on the inlet pipe must enable
the removal of the constant-flow valve for cleaning. Required
water pressure upstream of the constant-flow valve = 3 bar,
max. permissible pressure = 11 bar.
2.7.2 Required water flow rate for once-through
water
BCHA 85% Degree of 65% Degree of
Size humidification humidification
Water flow Water flow
required, l/min. required, l/min.
004 2.8 –
006 2.8 –
009 8.0 5.7
014 9.0 7.0
020 11.4 8.8
027 16.0 11.4
035 18.0 13.3
055 23.0 16.0
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GB.BCHA455.050101
Specifications are subject to alteration without notice.
3.5 To clean the humidifier cassettes
Unlatch the locking pins at the top (1)
and bottom (2).
Remove the retaining piece of
the cassettes (3).
Back off the hose couplings (4).
The cassettes can now be
withdrawn (5).
Hose them clean with water.
OBS! Do not confuse the hose
connections when refitting.
2
1
3
4 5
3. Maintenance
3.1 General
Cleaning at regular intervals is necessary to ensure that the
humidifier will operate as intended without malfunctioning.
The interval between cleaning is largely conditional on the
evaporation rate, dust content in the air, water quality and
whether once-through or circulated water is used.
The humidifier should be inspected every third month and
should be cleaned every six months.
3.2 Service under special conditions
Drain and clean the water tray whenever the system is
shut down for an extended period, such as during long
weekends.
If the humidifier is to be out of service for some time, the
humidifier fills should be removed and stored where they
will not sustain damage.
If there is a high concentration of calcium and bicarbonate in
the water or if the dust concentration in the air is high, inspect
the humidifier more often. If circulated water is used, the
bleed-off flow can be increased (see page 2). The frequency
of inspection and the bleed-off rate are conditional on the
installation and should be based on experience.
3.3 When servicing, check the following:
1
The humidifying surface should be equally damp on
both sides. If they are not, clean the water system and
the spray pipes above the humidifier cassettes.
2
Water should be bled-off through the drain valve – if not,
clean the valve and refit it back in its original position. If
softened water is used, very little bleed-off will occur and
the valve may easily become clogged.
3 The humidifier cassettes and water tray should be clean
– if not, clean them.
4 The water trap should be filled with water.
5 There should not be any salt deposits on the front or
back side of the humidifier – if there are, increase the
water bleed-off by 25%.
3.4 Measures prior to major maintenance
Switch off the water pump (circulated water) or turn off the
water supply (once-through water) and let the fans run for
about 30 min. to allow the humidifier to dry. The humidifier
cassettes are relatively fragile when they are wet and should
be handled with care.
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GB.BCHA455.050101
Specifications are subject to alteration without notice.
1
3
4
5
2
3.7 To clean the spray pipe above the humidifier fills
The spray pipe is easy to reach after the cassettes have been
withdrawn from the humidifier. Open the hose clamp (2) and
lift the cover plate with spray pipe (3). Pull the spray pipe (4)
out of the cover plate. Remove the end plugs (5) from the
spray pipe. Use an awl or a similar tool to clean the holes in
the spray pipe and flush the pipe clean with water.
3.6 To clean the water tray
Remove the overfilling protection (1) and clean the bottom
of the water tray.
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GB.BCHA455.050101
Specifications are subject to alteration without notice.
BCHA B H L
L
93
53
42
H
B
Inlopp
ø12
Utlopp
ø40
Voltage Rated output Rated current Voltage Rated output Rated current
Size
Pump motor: 400/230 V, 3-phase Solenoid valve
V W A
009
014–055
230
Y 400
230
Y 400
0.71
0.41
0.88
0.50
120
180
230
230
18
18
0.1
0.1
Degree of protection IP:54, insulation class B
4.1 Electrical data
4. Technical data
Weight, std. Weight, EI 30
W/o water With water W/o water With water
65% 85%
Weight, std. Weight, EI 30
W/o water With water W/o water With water
60 66 68 74
70 80 80 90
94 142 110 158
117 180 137 200
130 211 152 233
163 269 189 295
195 325 225 355
242 417 277 452
004 1039 546 453
006 1259 656 453
009 1459 756 653
014 1759 906 653
020 1946 1026 653
027 2306 1206 653
035 2706 1406 653
055 3206 1656 653
4.2 Dimensions
– – – –
– – – –
88 130 104 146
111 162 131 182
120 188 142 210
138 212 164 238
175 277 205 307
212 347 247 382
Outlet
Inlet
V W A
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