Industrial air curtains
Model IndAC
Industrial air curtain,
model IndAC
Free Industrial ACces
Industrial building doors are often open for long periods of time to facilitate
transport in and out of the building. However, open doors result in a loss of heat to
the outside and the ingress of cold air. This disturbs the climate within the building,
which leads to uncomfortable working conditions for staff. Internal transport does
not want to be hindered by closed doors either, so internal doors between production
halls and storage spaces for instance, are open all day long. If there is a difference
in temperatures between these rooms, air will exchange, leading to draughts.
During loading and unloading the door
remains open, without the indoor climate
being disturbed.
The new Biddle industrial air curtain, model IndAC, is highly suitable to handle these
kinds of situations. Many years of experience in combination with scientific
research, forms the basis for the IndAC, which has a distinct robust appearance.
The IndAC makes the entrance accessible for transport and prevents cold air entering
the building, which results in free access, comfortable working conditions and less
absence due to illness.
Benefits of IndAC
Energy saving solution
•
•
•
•
•
•
Doorways of industrial buildings are usually faced with direct wind attack, or suffer
from under-pressure, resulting in large air volumes being introduced into the working
area. In order to provide optimum screening, a unit with large air volumes is required
in most situations.
•
•
•
•
Free access
No draughts (on workplace)
Low energy consumption
Less absence due to illness
No air leakages
Combines well with overhead door
systems
Various options
Flexible suspension system
Easy to control
Easy to maintain (no filter)
Therefore, Biddle has optimised the discharge pattern for industrial applications.
The air passes through the curved discharge section with minimal resistance. The
patented Double Rectifier ensures that turbulent air from the fans is bundled into a
laminar air stream, discharging in a straight vertical line to the floor. Additionally, the
homogeneous discharge pattern across the door provides optimum heating of cold
outside air, eliminating draughts in the building and preventing expensive energy
being lost to the outside.
The curved design of the discharge section also means that it is easily installed
close to the door, preventing air leakages. The result is a well screened doorway
with a minimum loss of heat.
Combines well with overhead door
systems.
2
Both above and next to the door
IndAC air curtains can be installed directly above or next to the door. Different
installation positions are possible depending on the room layout around the door
(see page 7).
Modular design
The modular design of the IndAC facilitates the installation of multiple devices next
to or above each other, in order to cover any door height or width.
Very easy to mount and clean
The design of the IndAC is such that the various parts are very easy to access,
making it easy to mount, install, maintain and clean. The unit contains a minimum
of ‘internal obstacles’, resulting in a smooth air flow through the unit in which dust
has little chance of collecting.
Pronounced industrial style
Model IndAC can be installed both
horizontally and vertically.
The IndAC is a truly industrial product with a robust and modern design. The colours
are matched to the latest developments within the industry. Thus the casing is
supplied in Blue (RAL 5023), with the external components finished in a ‘metallic’
colour. Other colours are available upon request.
IndAC with electric heating.
3
Technology
When a door is open, the difference between the outside and inside temperature
leads to an exchange of air, resulting in cold air entering and warm heated air flowing
out. An air curtain above or next to the open door provides separation of the two
climates. Whilst developing the IndAC, Biddle has researched the outlet discharge
pattern. The result is the Double Rectifier.
Fan offering air-engineering benefits
Patented Double Rectifier
The IndAC is equipped with radial backward curved fans which homogeneously
distribute the air across the whole discharge opening, producing high efficiency and
comfort levels. Another advantage is the low sound level of the fan.
Patented Double Rectifier
If a conventional industrial air curtain without a rectifier discharges air at the same
rate as a unit with a Double Rectifier, the downward penetration is tangibly less (see
Figure 1). The air stream does not reach the floor, and the open door is not screened
off properly (see Figure 3). Consequences include draught and loss of heat.
Side view
Fig. 3
Industrial air curtain without rectifier
Front view
Fig. 1
Industrial air curtain without rectifier
Fig. 2
IndAC with Double Rectifier
Due to the discharge pattern of an industrial air curtain with a Double Rectifier the
incoming cold air is heated so that it is no longer experienced as draught. The
Double Rectifier has vertical fins mounted on top of the horizontal fins to streamline
the air flow in a better way, resulting in an excellent downward penetration (see
Figure 2). The Double Rectifier, which minimises turbulence in the discharge air
stream and surrounding air, ensures that the air movement generated by the fans,
is directed downward in a deeply penetrating laminar air stream (see Figure 4).
As a consequence the energy consumption is reduced and comfort levels are
increased all year round.
Fig. 4
IndAC with Double Rectifier
4
Selection
An air curtain should be selected so that it has sufficient capacity to heat up the cold
entering air to a comfortable temperature. Additionally, the unit should be able to
screen off the entire doorway. The selection of an appropriate air curtain depends on:
1. Door height or width
2. Situation (building)
1. Door height or width
The door height or width is measured from the bottom or side of the unit. These are
known data, so based on the table at the bottom of this page it is easy to select
your air curtain. It is important for the air curtain to be positioned close to the door
with a minimal gap. In addition, the air curtain should be at least as wide or high as
the door opening, as a too short air curtain will lead to air leakages on the sides or
at the top.
2. Situation (building)
The conditions at a doorway vary continuously, leading to difficulty in determining
the volume and temperature of outside air entering the building. Other aspects such
as multiple open doors in a single room, or the orientation of the building may also
have a large influence on the capacity need. To make selection easier for you, please
use the following guidelines.
• Favourable conditions: no direct wind attack, a sheltered location, internal
(inside) doors.
• Normal conditions:
little direct wind attack, no open doors opposite
one another.
• Normal conditions:
direct wind attack on open door, multiple open doors,
large mechanical extraction rates, location in open
country.
1
2
Conditions
Door height /
width1
Favourable
Normal
Unfavourable
3-4m
IndAC S
IndAC S
IndAC M
4-5m
IndAC S
IndAC M
IndAC L2
5-6m
IndAC M
IndAC L
IndAC L-W3
6-8m
IndAC L
-
-
Mounting height, measured from the bottom or side of the unit.
The L-type will be available by mid-2007.
The above selection table is for indicative purposes only. If in doubt, please contact
Biddle for advice.
5
Various options
Typecode
IndAC S-150-W1-2R
Capacity
S = S(mall)
M = M(edium)
L = L(arge)*
Unit length
150 = 150 cm
200 = 200 cm
Coil type
W1 = Water heating high water temperatures
W2 = Water heating medium water temperatures
W3 = Water heating low water temperatures
E = Electrical heating
A = Ambient, no heating coil
Installation position
0 = Horizontal, above door
1R = Vertical, right side, square to wall
1L = Vertical, left side, square to wall
2R = Vertical, right side, parallel to wall
2L = Vertical, left side, parallel to wall
* The L-type will be available by mid-2007.
Variants
The industrial air curtain is available in two capacities: S(mall) and M(edium). There
are two lengths to choose from; 1.5 and 2.0 metres, and by combining these two
types, any desired discharge width or height, from 3.0m, can be achieved in 0.5m
increments. Both types are supplied with a water heating coil, an electric heating
coil, or without any heating coil (ambient). The IndAC can be positioned horizontally
and vertically (see page 7). Further, the device is available with a Basic, Plus or
Automatic control unit (see page 8).
Type
Unit length1
Coil type
Installation positions
IndAC S
150
W (water)
Horizontal
IndAC M
200
E (electric)
Vertical
A (ambient)
- right or left
- square or parallel
to wall
1
From 3.0m, any combination of the two unit lengths is possible.
Standard delivery and accessories
Model IndAC is delivered with:
• two suspension brackets - for horizontal installation
• two coupling plates - for vertical installation
• wall bracket - for vertical installation
• connection cable to interlink adjoining units
These components are also needed:
• Basic, Plus or Automatic controller
• base plate / plinth - for vertical installation
Options:
• door contact switch
• room thermostat
Flexible suspension system
With horizontal installation, the unit is suspended above the door by using four
threaded rods (M12) and the suspension brackets supplied (see picture alongside).
As a flat surface is essential with vertical installation, it is recommended to place
the IndAC on a base plate. By using the supplied coupling plates and wall bracket it
is easy to fix and secure the unit.
6
Diversity in installation positions
The room layout around a door determines where and how an air curtain can be
best installed. Thanks to a diverse range of installation positions, the IndAC air
curtain can be matched to the possibilities offered by the local situation.
The units should be positioned above or next to the door, covering the full length or
width of the doorway. Depending on the situation, the air curtain is either installed
horizontally above or vertically next to the door (to the left or right or on both sides).
There are a total of five installation positions, which are shown below.
Installation
position
Situation
Explanation
0
Horizontal
- above door opening
1R
Vertical
- right side of door opening
- square to wall
1L
Vertical
- left side of door opening
- square to wall
2R
Vertical
- right side of door opening
- parallel to wall
2L
Vertical
- left side of door opening
- parallel to wall
Horizontal installation (position 0): excellent
to combine with overhead door systems.
Example of vertical installation (position 2R):
to the right and parallel to wall.
Air direction
Inspection side
Wall
Door
Ceiling
7
Control options
Three types of controller are available: Basic, Plus or Automatic. The control panel
allows you to control the climate separation between inside and outside in a simple
and comfortable way.
1. Basic controller (RTRD)
The five-speed controller allows you to match the volume of air to different conditions.
The RTRD-controller has a rotary control switch for five speeds, a neon indicator and
an input for a door contact switch or room thermostat.
Basic controller (RTRD) with neon indicator
and connections for room thermostat and
thermal contacts.
1
2
2. Plus controller (RDP)
The Plus controller has two switches with five speeds:
1 = with open door
2 = heat demand when door closed
This controller is supplied with two rotary control switches. To switch from button
1 to 2, a door contact switch should be connected to the first input. To the second
input, a room thermostat should be connected. The air curtain will not switch off
until the room has reached the desired indoor temperature. On request, this controller
can be delivered with more control options.
3. Automatic controller
In situations where doors must be open frequently and for longer periods of time, it is
difficult to ensure a constant indoor temperature as external conditions can change
continuously throughout the day. This often leads to complaints about draughts or to
high energy consumption needed to keep the temperature comfortable inside.
The control panel has the following
dimensions: 600 x 330 x 205 mm (l x w x d)
The automatic controller is developed to economically create a comfortable indoor
climate in these changing conditions. By means of the air and water controls the air
volume and discharge air temperature are geared automatically to each other. This
controller adjusts the heat demand to different conditions.
The basis of this unit is a five-speed controller, which is coupled to a pre-programmed
control (PLC). This fully automatic controller has connections for input signals, to
which various sensors, such as integrated floor or air temperature sensors, can be
connected. The controller also features output signal connections, so that the desired
discharge temperature of the air stream can be regulated.
8
Electrical connections
Interlinking units and connecting
Basic controller
IndAC 150
fan motors
IndAC 200
thermal contacts
fan motors
fan motors
thermal contacts
fan motors
connection cable delivered by
Biddle
RTRD-five-speed controller
Connecting Plus controller
connection to unit
(see above)
RDP
wired by Biddle
restriction of unit
not wired by Biddle
on / off door contact switch or room thermostat
9
Technical data
Water Heating
General data
unit lenght
door width / -height1
air inlet temperature
electrical supply
max. current motors
max. power motors
tapping voltage
IndAC S-150
W1
Speed
1
air displacement
m3/h 1830
air outlet temperature
ºC
46
heating capacity
kW 19.5
water flow rate
l/h
862
water pressure loss
kPa
1.7
sound pressure level at 5m dB(A) 34
weight
kg
2
2840
41
25.5
1124
2.7
44
m
m
ºC
V/ph/Hz
A
kW
Speed
V
LPHW 90/70°C
3
4
5
3640 4320 5150
39 37 35
29.4 32.3 35.2
1295 1424 1565
3.6 4.2
5
50 54 59
92
W2
1
1830
50
22.2
971
1
34
W1
LPHW 90/70°C W2
Speed
1
2
3
4
5
1
3
air displacement
m /h 2440 3790 4850 5760 6870 2440
air outlet temperature
ºC
48 43 40 38 36 52
heating capacity
kW 27.2 35.7 41.2 45.3 49.9 30.9
water flow rate
l/h 1200 1572 1815 1998 2199 1356
water pressure loss
kPa
3.8 6.3 8.2 9.8 11.7 2.1
sound pressure level at 5m dB(A) 35 45 52 56 61 35
weight
kg
119
S-150
1.5
0.96
0.33
1
95
W1
LPHW 90/70°C
Speed
1
2
3
4
5
3
air displacement
m /h 2750 4160 5230 5790 7410
air outlet temperature
ºC
42 37 35 34 32
heating capacity
kW
25 31.7 35.8 37.7 42.6
water flow rate
l/h 1104 1395 1577 1662 1879
water pressure loss
kPa
2.6 4.1 5.1 5.6 7.1
sound pressure level at 5m dB(A) 40 48 53 57 62
weight
kg
99
W2
1
2750
46
28.7
1258
1.6
40
W1
LPHW 90/70°C W2
Speed
1
2
3
4
5
1
3
air displacement
m /h 3670 5550 6970 7720 9870 3670
air outlet temperature
ºC
43 38 36 35 33 47
heating capacity
kW
35 44.4 50.3 53 60.1 40.3
water flow rate
l/h 1543 1957 2216 2338 2648 1765
water pressure loss
kPa
6.1 9.5 11.9 13.1 16.5 3.5
sound pressure level at 5m dB(A) 41 49 55 58 63 41
weight
kg
128
10
Based on normal circumstances. For selection see page 5.
15
400 / 3 / 50
1.28
1.56
0.44
0.81
2
3
4
145
190
240
2.08
1.08
5
400
2
2840
45
29.3
1282
1.7
44
W3
1
1830
41
16
695
0.6
34
2
2840
37
21.3
923
1
44
LPHW 60/40°C
3
4
5
3640 4320 5150
35 33 32
24.7 27.3 30.1
1071 1183 1304
1.3 1.5 1.8
50 54 59
97
2
3790
47
41.1
1799
3.6
45
LPHW 80/60°C
3
4
5
4850 5760 6870
44 42 40
47.7 52.7 58.2
2090 2309 2551
4.8 5.8
7
52 56 61
124
W3
1
2440
43
23
998
1.3
35
2
3790
39
30.8
1337
2.2
45
LPHW 60/40°C
3
4
5
4850 5760 6870
37 35 34
35.9 39.8 44
1558 1725 1908
2.9 3.5 4.3
52 56 61
126
2
4160
41
36.6
1605
2.6
48
LPHW 80/60°C
3
4
5
5230 5790 7410
38 37 35
41.6 43.9 49.9
1822 1924 2186
3.2 3.6 4.6
53 57 62
102
W3
1
2750
37
20.9
906
0.9
40
2
4160
34
26.7
1158
1.5
48
LPHW 60/40°C
3
4
5
5230 5790 7410
32 31 29
30.3 32 36.3
1314 1388 1576
1.8
2 2.6
53 57 62
104
2
5550
42
51.6
2261
5.6
49
LPHW 80/60°C
3
4
5
6970 7720 9870
40 39 36
58.7 62 70.7
2572 2719 3097
7.1 7.9 10
55 58 63
133
W3
1
3670
39
30.2
1311
2.1
41
2
5550
36
38.9
1689
3.4
49
LPHW 60/40°C
3
4
5
6970 7720 9870
34 33 31
44.3 46.9 53.5
1924 2035 2319
4.3 4.8 6.1
55 58 63
136
IndAC M-200
1
M-150
M-200
1.5
2.0
4.0 - 5.0
LPHW 80/60°C
3
4
5
3640 4320 5150
42 40 38
33.9 37.4 41.2
1485 1639 1807
2.2 2.7 3.2
50 54 59
95
IndAC S-200
IndAC M-150
S-200
2.0
3.0 - 4.0
Technical data
Ambient units
General data
unit length
door width / -height
electrical supply
max. current motors
max. power motors
m
m
V/ph/Hz
A
kW
Speed
V
tapping voltage
IndAC S
Speed
air displacement
m3/h
sound pressure level at 5m dB(A)
weight
kg
1
1830
34
2
2840
44
150
3
3640
50
78
4
4320
54
5
5150
59
1
2440
35
2
3790
45
200
3
4850
52
101
4
5760
56
5
6870
61
1
2750
40
2
4160
48
150
3
5230
53
85
4
5790
57
5
7410
62
1
3670
41
2
5550
49
200
3
6970
55
111
4
7720
58
5
9870
63
IndAC M
Speed
air displacement
m3/h
sound pressure level at 5m dB(A)
weight
kg
S-150
S-200
M-150
M-200
1.5
2.0
1.5
2.0
3.0 - 4.0
4.0 - 5.0
400 / 3 / 50
0.96
1.28
1.56
2.08
0.33
0.44
0.81
1.08
1
2
3
4
5
95
145
190
240
400
Electric Heating
General Data
unit lenght
m
1
door width / -height
m
air inlet temperature
ºC
electrical supply
V/ph/Hz
max. current motors
A
max. cur. cons. (per phase)
A
max. power motors
kW
max. power consumption
kW
Speed
tapping voltage
V
IndAC S
Speed
air displacement
m3/h
air outlet temperature
ºC
heating capacity
kW
sound pressure level at 5m dB(A)
weight
kg
1
0.96
45.2
0.33
31.2
1
95
S-200
2.0
3.0 - 4.0
M-150
1.5
M-200
2.0
4.0 - 5.0
15
400 / 3 / 50
1.28
1.56
60.9
67.8
0.44
0.81
42
46.8
2
3
4
145
190
240
2.08
91.3
1.08
63
5
400
1
1830
27
7.4
34
2
2840
28
12.4
44
150
3
3640
29
17.3
50
119
4
4320
30
22.2
54
5
5150
32
29.6
59
1
2440
27
10
35
2
3790
28
16.6
45
200
3
4850
29
23.3
52
155
4
5760
30
29.9
56
5
6870
32
39.9
61
1
2750
31
14.8
40
2
4160
31
22.2
48
150
3
5230
32
29.6
53
126
4
5790
34
37.1
57
5
7410
33
44.5
62
1
3670
31
20
41
2
5550
31
29.9
49
200
3
6970
32
39.9
55
165
4
7720
34
49.9
58
5
9870
33
59.9
63
IndAC M
Speed
air displacement
m3/h
air outlet temperature
ºC
heating capacity
kW
sound pressure level at 5m dB(A)
weight
kg
S-150
1.5
Based on normal circumstances. For selection see page 5.
11
Explanation of technical data
Heating capacity correction coefficients
The heating capacity of the battery type W1 represented in the tables on page 10
and 11 is based on a water range of 90/70ºC. The heating capacity of battery type
W2 is based on a water range of 80/60ºC and of W3 on 60/40°C. An air inlet
temperature of + 15ºC has been assumed. When other water temperatures and/or
air inlet temperatures are used, the heating capacity is to be multiplied by the
appropriate correction factor given below.
Heating capacity correction factors for battery types W1, W2 and W3
WaterAir inlet temperature
temperature
+ 5ºC
+ 10ºC
+ 15ºC
+ 18ºC
W1 W2
W3
W1 W2 W3 W1
W2 W3 W1 W2
W3
120/100°C
1.74 2.10 3.72 1.64 1.98 3.51 1.54 1.85 3.30 1.48 1.78 3.17
110/90°C
1.56 1.88 3.35 1.46 1.76 3.12 1.37 1.65 2.93 1.31 1.58 2.80
100/80°C
1.38 1.67 2.97 1.28 1.55 2.76 1.19 1.44 2.55 1.13 1.37 2.43
90/70°C
1.19 1.45 2.58 1.10 1.33 2.38
1
1.22 2.17 0.95 1.15 2.05
80/60°C
1.00 1.22 2.18 0.91 1.11 1.98 0.81
1
1.78 0.76 0.93 1.66
70/50°C
0.81 1.00 1.78 0.72 0.89 1.59 0.63 0.78 1.39 0.57 0.71 1.28
60/40°C
0.62 0.78 1.39 0.53 0.67 1.19 0.53 0.56
1
0.39 0.50 0.89
W1
1.44
1.27
1.09
0.91
0.72
0.54
0.36
+ 20ºC
W2 W3
1.74 3.08
1.53 2.72
1.32 2.35
1.11 1.97
0.93 1.68
0.71 1.20
0.50 0.81
To increase the service life of the fans as well as for safety reasons, the maximum discharge air temperature allowed is 65ºC.
Water flow rate
mw
Q
ρw
Cpw
= water flow rate [l/h]
= capacity [kW]
= density of water (=1) [kg/l]
= specific heat of water
(=4.18) [kJ/kg°C]
ΔTw = temperature difference,
water [°C]
When water and room temperatures other than the values represented in the tables
are used, the water flow rate can be roughly calculated using the formula below.
Before doing so, the heating capacity must first be recalculated based on the table
above.
mw =
Q
ρwC pw ΔTw
•
3600 [ l/h]
Waterside pressure loss
Δ pw2 = waterside pressure loss [kPa]
Δ pw1 = waterside pressure loss
according to table values [kPa]
mw1 = water flow rate
table values [l/h]
mw2 = water flow rate calculated
using formula [l/h]
When water temperatures other than the values represented in the tables are used,
the waterside pressure loss can be calculated using the formula below. To do so,
the water volume must first be calculated.
2
( )
m
Δ pw2 = Δ pw1 mw2
w1
[kPa]
Sound
T
T0
V
V0
n
= reverberation value,
deviating room [s]
= reverberation value ref. room [s]
(see table)
= volume, deviating room [m3]
= volume, reference room [m3]
(see table)
= number of units
The sound data represented on pages 10 and 11 were measured at a distance of
5m from the device, in a room with a reverberation time of 0.8 seconds and with a
volume of 2500m3. If a unit is used in a deviating room, or if multiple devices are
used in a single room, the sound pressure level must be recalculated. This can be
done using the below formula below. The relevant table value can be found in the
tables on pages 10 and 11.
(
table value + 10 • log
12
()
T
T0
()
V
-10 • log
V0
+10 • log (n)
) [dB(A)]
Dimensional sketches
Installations position1 horizontal (0) and vertical, square to wall (1R and 1L)
70
290
A
M12 female thread
for suspension /
fixation (4x)
18
Position 0
D
407
18
290
45
G 1" female thread
Supply (1L)
Return (0, 1R)
C
Inspection panel
G 1" female thread
Supply (0, 1R)
Return (1L)
Lead-through electrical
wiring ø22.5
Type
IndAC S-150
IndAC S-200
IndAC M-150
IndAC M-200
A
1500
2000
1500
2000
B
1464
1964
1464
1964
C
104
104
146
146
Coil type
Water
Ambient
Electric
Notes:
• The type without heating element (= ambient) does not have water connections.
1
For explanation of installation positions see page 7.
49
583
Wall
49
Ceiling
Door
B
45
D
956
853
976
13
Dimensional sketches
Installatieposition1 vertical, parallel to wall (2R and 2L)
D
290
407
Door
583
C
Wall
Inspection panel
Lead-through electrical wiring ø22.5
49
Type
IndAC S-150
IndAC S-200
IndAC M-150
IndAC M-200
A
18
45
B
45
18
49
G1” female thread
Supply (2R)
Return (2L)
70
G1” female thread
Supply (2L)
Return (2R)
A
1500
2000
1500
2000
B
1464
1964
1464
1964
C
104
104
146
146
290
Coil type
Water
Ambient
Electric
Notes:
• The type without heating element (= ambient) does not have water connections.
1
For explanation of installation positions see page 7.
14
M12 female thread
for fixation (4x)
D
956
853
976
Dimensional sketches
Horizontal Installation: Suspension Brackets
580
480
50
ø 13
50
290
145
36
Max. 1000
36
145
M12
Vertical installation
Coupling plate
ø1
18
3
72
18
370
40
290
40
Base plate / plinth (accessory)
690
ø1
3
583
75
433
90 °
75
400
290
427
70
20
Notes:
• With horizontal installation, two suspension brackets are supplied as standard.
• With vertical installation, two coupling plates and a wall bracket (not drawn) are supplied as standard. The base plate / plinth is an accessory.
• Threaded rods are not supplied as standard.
15
Specifications
Casing
The casing and the inlet grille are manufactured from zinc-plated sheet steel, extra
strengthened to minimise deformations and vibrations, and have a full-polyester
powder coating. The Double rectifying discharge grille is made of aluminium. The
main casing is supplied in Blue (RAL 5023) and the air inlet and discharge grilles in
the colour titan (Polydrox). Other colours are available at an extra charge.
Motor / fan assembly
The fans are powered and controlled
by the control unit. By connecting a
power cable to the terminal boxes in
the control box and in the IndAC, the
two are connected with each other.
Electrical
connections
16
The standard motor is supplied with thermal contacts, which will break the circuit
of the motor when the maximum permissible motor temperature is exceeded.
LPHW heating battery
The heating battery is manufactured with 1/2” Copper tubes and Aluminium fins.
The water connections are G1” female thread. The test pressure is 9 bars and the
maximum operating pressure is 8 bars at 125ºC. Higher temperatures and pressures
are available upon request.
The IndAC is supplied fully wired.
The connection cable included makes
it easy to interlink multiple units.
Apart from this cable, only the mains
supply cable needs to be connected.
Electric heating battery
Subject to change.
Biddle bv
P.O. Box 15
NL-9288 ZG Kootstertille
The Netherlands
tel. +31 512 33 55 24
fax +31 512 33 55 54
e-mail export@biddle.nl
internet www.biddle.info
The electric heating battery is manufactured with aluminium fins. The battery is
controlled electronically and fitted with overload protection. When the device is
switched off, the fans will continue to rotate until the fins have cooled sufficiently.
INDAC.EX-GB.2006-12-PDF
Control and
operation
The radial backward curved fans are mounted in the casing such that they cause
no vibration. Each fan is driven by a rotor motor on ball bearings. The fan casing
and impellers are manufactured from Aluminium. Motors for water and ambient
units are rated to protection class IP44.
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