Easily maintained air curtain
Comfort air curtains
Model DoorFlow
Comfort air curtains
Comfortable and inviting
Outside doors of shops and public buildings are often left open for commercial
reasons. An open door arouses the curiosity and makes the building more accessible
to people, which contributes to a customer-friendly approach. When the door is open,
incoming colder outside air will disturb the indoor climate. For customers as well as
for staff, draught feels very unpleasant. Besides, costly warm indoor air can freely
escape to the outside.
The comfort air curtain, model DoorFlow, warms the cold air before entering the building
and prevents the escape of warm air from leaving through the open door. Installing
model DoorFlow above the open door means increased energy efficiency and the
prevention of draught problems. The DoorFlow proves that an open door and a
comfortable inner climate can coexist very well.
Easy maintenance
The DoorFlow above the door entrance
creates a draught-free inner climate.
The comfort air curtain, model DoorFlow, is quite easy to maintain. Because the
DoorFlow has no filters, cleaning and replacing filters belong to the past.
Benefits model DoorFlow
Low water temperatures
• Easy maintenance
• Low water temperature coil
• Good price-quality ratio
• Comfortable inner climate
• High efficiency / energy savings
• Trendy design
• Low noise level
• Automatic room temperature control
• User-friendly
• Fast installation
The DoorFlow can be connected to any CH-installation, because for every situation a
suitable coil is available. The low water temperature coil (4-row) is suitable for water
ranges between 45/35 °C and 70/50 °C. For water ranges of 80/60 °C and 90/70 °C
the common 2-row coil is available.
Trendy design
Because of its trendy look the DoorFlow blends with every interior. The recessed and
cassette model can be integrated discreetly into the ceiling. The unit is finished in
neutral colours. By installing multiple units next to each other in one line, the trendy
design is even more emphasized.
2
High efficiency air curtain
Application
The DoorFlow is highly suitable for use in:
• shops
• supermarkets
• public buildings
With open doors the difference between the indoor and outdoor temperatures
leads to an exchange of air, with precious heat being lost to the outside and colder
outside air flowing in. Installing a DoorFlow air curtain above the open entrance
prevents heat loss to the outside and heats up the cold outdoor air to the desired,
comfortable room temperature.
All Biddle air curtains come with the patented rectifier technology. This technology
ensures that the turbulent air flow from the fans is converted into a laminar air
stream. This makes it possible to reach the floor with much less air whilst the door
opening is properly protected. The comfort and efficiency are much higher compared
with conventional air curtains.
User-friendly
The DoorFlow air curtain comes as a standard with a user-friendly control panel. The
manual setting of the standard controller makes it possible to choose the right fan
speed of the air curtain: low - medium - high. If the DoorFlow is extended with a
room temperature control, the indoor temperature can be controlled manually as
well as automatically by means of the control panel (see page 6).
Biddle rectifier
References
•
•
•
•
•
•
•
Burger King
C&A
Cecil
Esprit
Hema
Jumbo Supermarket
Marc O’Polo
Fast and easy installation
The DoorFlow air curtain is mounted by means of threaded rods and is as a standard
ready to plug in. This makes the unit easy to install. Low voltage cables connect the
control panel “plug and play” to the unit. It is also possible to interlink different units
in a “plug and play” way.
In shops, the air curtain provides for a
comfortable inner climate, while the
door remains open.
3
Additional applications
Air curtains and revolving doors:
the perfect combination
A revolving door in the entrance is an architectural step towards creating a comfortable climate in a shop or a public building. But every time a customer goes through
a revolving door, cold air comes inside. Customers and staff find the draught very
unpleasant. Besides, heating the cold external air costs additional energy.
Tourniquet air curtain
The tourniquet air curtain prevents draughts,
which keeps the interior at a pleasant
temperature.
For this reason Biddle has developed a solution specifically for revolving doors, named
model tourniquet. The striking feature of this model is that it is supplied with a curved
outlet grille, precisely in line with the curve of the revolving door. This protects the
entire door opening. The smooth discharge grille fits nicely into the whole and the air
curtain is invisibly hidden away in the ceiling or upper part of the revolving door. The
result is a perfect, energy-efficient climate separation.
Easy maintenance (no filters)
Air curtains in combination with revolving doors are hard to access, because they
are built into the ceiling. Therefore filters are often not replaced or cleaned. The great
advantage of the tourniquet DoorFlow air curtain is that it does not contain any filters.
This means that maintaining and cleaning filters is a thing of the past.
Custom work
The discharge grille is precisely in line with
the curve of the revolving door.
4
Biddle tourniquet air curtains are suitable for all types of revolving doors. The curve of
doors (radius) and type vary per project, so the discharge grille is custom made. For
further details please contact the sales department at Biddle.
Climate separation during warm outdoor
temperatures
Air curtains are generally used to separate a pleasant warm indoor climate from the
cold outdoor climate. An air curtain is also very effective in the reverse situation,
where the cool indoor climate has to be separated from the hot outdoor (summer)
climate. The ambient model from the DoorFlow range (without heating element) is a
suitable solution for this. It is also possible to switch off the heating of an heated air
curtain.
On hot days, an unheated air curtain can
achieve a cool indoor climate.
Unheated air curtains can also provide the optimum climate separation during hot
summer days. The air curtain blows out relatively cool air at low speed as well,
which provides an additional cooling effect at the entrance on top of the cooling
provided by the air conditioning. Because the air curtain takes in this conditioned air,
this considerably improves the air circulation or refreshment rate, keeping the entire
space pleasantly cool.
Climate separation in cooled spaces
An air curtain above an open door to a cooled space also offers great advantages.
The door can remain open, without the room temperature rising. As well as offering
advantages for processing, storage and transportation, this also promotes sales in
supermarkets, for example. Customers are more likely to go in and out.
To keep the temperature constant, it is important to keep the cooled space closed to
other air inflows and there should preferably not be any other doors.
The ambient DoorFlow air curtain provides
perfect climate separation in a cooled space.
5
Thermostatic control
The water heated units of the DoorFlow come as a standard with an air side speed
controller and can be extended with a water side room temperature controller.
Electrically heated units come as a standard with a room temperature controller.
1. Air side control
The air side control allows the user to regulate the speed of the air curtain using the
controller. Three fan speeds are available: low - medium - high.
2. Water side room temperature control
The control panel can be easily fixed on
the wall.
Electrically heated units come standard with room temperature control. With hot water
heated units, the air side control can be extended with waterside control (3-way
valve). By means of the water control, it is possible to set the room temperature
manually or automatically via the control panel.
Manual setting
The heating can be switched manually to 100 or 50% of the capacity. Besides, it is
possible to switch off the heating (ambient) to make climate separation possible
during warm periods or in cooled spaces (see page 5).
Automatic setting
If the air curtain is controlled automatically, the air curtain itself reads the room
temperature and automatically selects the correct heating level to ensure and maintain
the preset room temperature level. The desired room temperature can be selected
by means of the control panel. The LEDs represent the temperature setting of 18 ºC
to 25 ºC. The heating can be switched off which is shown by the bottom LED. For
instance, if 22 ºC is set, the air curtain automatically selects the correct capacity to
ensure this room temperature is maintained.
Three-way valve
Control of more units
Multiple units (max. 8) can be controlled by one control panel.
More control options
Also a timer, door contact switch and BMS can be connected to the electronic control.
To achieve maximum climate separation with minimum energy consumption, Biddle
recommends selection of the lowest strength at which no draught occurs.
6
Many possibilities
Type code
DF S-100-W-F
DF= DoorFlow
Type
S = Small (200 - 250 cm)
M = Medium (250 - 300 cm)
L = Large (300 - 350 cm)
Unit length (cm)
100-150-200-250
Coil type
W2= Water heating (2-row)
W4= Water heating (4-row)
E = Electric heating
A = Ambient (no heating)
Model
F =Free-hanging
R=Recessed
C = Cassette
T = Tourniquet
The type coding is put together by
selecting 1 of all parts.
The comfort air curtain, model DoorFlow, is available in three types:
1. S (Small): for installation heights of 200 to 250 cm.
2. M (Medium): for installation heights of 250 to 300 cm.
3. L (Large): for installation heights of 300 to 350 cm.
By installing multiple air curtains next to each other, there is a solution for any door
width. All types come in four lengths: 100, 150, 200 and 250 cm. Biddle can deliver
free-hanging, cassette and recessed models. Besides that, the tourniquet model is
perfectly suitable for revolving doors. All of these models feature an electric or hotwater (2- or 4-row) heating coil. An ambient device without heating coil is also a
possibility.
Selection
An air curtain is selected properly if it is able to screen off the entire width and height
of the door opening. The air curtain must be at least as wide as the doorway, to prevent
cold air bypassing the air stream. In addition, the unit must have sufficient capacity to
heat the entering cold outside air to a comfortable temperature level. It is also important
for the distance between the air curtain and the door to be as short as possible.
Type
Installation-
height¹
DF S
200 – 250 cm
Door width² Coil type W (Water)
100 – 150 –
DF M
250 – 300 cm
E (Electric)
200 – 250 cm
DF L
300 – 350 cm
A (Ambient)
¹
²
Models
Free-hanging (F)
Recessed (R)
Cassette (C)
Tourniquet (T)
Measured from floor to bottom of unit.
By banking air curtains, also a door opening wider than 250 cm can be covered.
Standard delivery and accessories
Water heated units come as a standard with an air side speed controller. Electrically
heated units come as a standard with a room temperature controller. The recessed
model (type R) is provided with an outlet duct.
Cassette model
For control and mounting purposes, the following additional accessories are available:
• Controller for one or more units
• Low voltage two plug cables (different lengths)
• Water sided room temperature control (3-way)
• Door contact switch
Colours
The DoorFlow is available in two colours: white (RAL 9016) and aluminium (RAL 9006).
Other RAL-colours are available on request against extra charge.
7
Technical data
Basic data
max. door width
installation height
room temperature
cm
cm
ºC
General selection data
Speed
air volume
heating capacity
sound pressure level at 3 m
m³/h
kW
dB(A)
100
200 - 250
20
150
200 - 250
20
2
985
5.2
44
3
1285
6.1
50
2
1485
8.6
45
3
1925
10.2
52
E3
A
W2 1
W4 1
E3
A
kg
kg
kg
V
kW
l/h
31
30
34
230
6.0
261
33
32
36
230
6.1
265
35
34
37
400
4.7
-
29
28
31
230
-
46
45
51
230
10.0
437
49
48
54
230
10.2
441
53
52
56
400
9.5
-
45
44
48
230
-
kPa
kPa
kW
A
kW
A
0.3
0.1
0.22
0.96
-
0.4
0.2
0.22
0.96
-
0.22
0.96
5.0
8.20
0.22
0.96
-
0.9
0.4
0.33
1.44
-
1.3
0.8
0.33
1.44
-
0.33
1.44
10.0
15.94
0.33
1.44
-
cm
cm
ºC
Speed
air volume
heating capacity
sound pressure level at 3 m
m³/h
kW
dB(A)
1
1545
10.2
40
DF S-200
DF S-250
200
200 - 250
20
250
200 - 250
20
2
1970
12.0
46
3
2570
14.2
53
1
1930
13.0
41
2
2465
15.4
47
3
3215
18.3
54
W2 1
W4 1
E3
A
W2 1
W4 1
E3
A
kg
kg
kg
V
kW
l/h
60
58
66
230
14.0
614
64
62
70
230
14.2
618
69
67
73
400
14.3
-
58
56
62
230
-
76
74
84
230
18.0
791
81
79
89
230
18.3
795
88
86
93
400
14.3
-
73
71
78
230
-
kPa
kPa
kW
A
kW
A
2.0
0.9
0.44
1.92
-
2.9
1.8
0.44
1.92
-
0.44
1.92
15.0
23.66
0.44
1.92
-
3.5
1.8
0.55
2.4
-
5.3
3.5
0.55
2.4
-
0.55
2.4
15.0
24.14
0.55
2.4
-
Installation data
1 The 2-row heating coil (W2) is suitable for the water ranges 80/60 °C and 90/70 °C and the 4-row heating
8
1
1175
7.4
39
W4 1
General selection data
weight model F
model R
model C
electrical supply
max. heating capacity2
max. water volume2
max. water pressure loss2
- incl. three-way valve
- excl. valve
max. power motors
max. current motors (1 phase)
max. power consumption heating
max. current consumption incl. fans (3 phases)
DF S-150
1
760
4.4
37
Basic data
max. door width
installation height
room temperature
DF S-100
W2 1
Installation data
weight model F
model R
model C
electrical supply
max. heating capacity2
max. water volume2
max. water pressure loss2
- incl. three-way valve
- excl. valve
max. power motors
max. current motors (1 phase)
max. power consumption heating
max. current consumption incl. fans (3 phases)
DF S
between 45/35 °C and 70/50 °C. 2 The W2 is based on a water range of 80/60 °C and the W4 on 60/40 °C (water heating).
3 Electric heating: it is possible to choose 0, 50 or 100% of the heating capacity at every speed.
coil (W4) for low water temperatures
Technical data
Basic data
max. door width
installation height
room temperature
cm
cm
ºC
General selection data
Speed
air volume
heating capacity
sound pressure level at 3 m
m³/h
kW
dB(A)
100
250 - 300
20
150
250 - 300
20
2
1195
5.8
47
3
1410
6.5
51
1
1420
8.4
42
2
1720
9.5
47
3
2130
10.8
53
W4 1
E3
A
W2 1
W4 1
E3
A
kg
kg
kg
V
kW
l/h
35
34
38
230
6.3
275
37
36
40
230
6.5
280
39
38
41
400
9.5
-
33
32
35
230
-
51
49
55
230
10.6
463
53
52
58
230
10.8
470
57
56
60
400
14.3
-
49
48
52
230
-
kPa
kPa
kW
A
kW
A
0.3
0.1
0.33
1.44
-
0.5
0.2
0.33
1.44
-
0.33
1.44
10.0
15.94
0.33
1.44
-
1.0
0.5
0.44
1.92
-
1.5
0.9
0.44
1.92
-
0.44
1.92
15.0
23.66
0.44
1.92
-
cm
cm
ºC
General selection data
Speed
air volume
heating capacity
sound pressure level at 3 m
m³/h
kW
dB(A)
1
2040
12.2
45
DF M-200
DF M-250
200
250 - 300
20
250
250 - 300
20
2
2390
13.6
49
3
2825
15.1
54
1
2440
15.3
45
2
2920
17.2
50
3
3555
19.5
55
W2 1
W4 1
E3
A
W2 1
W4 1
E3
A
kg
kg
kg
V
kW
l/h
68
66
74
230
14.8
648
72
70
78
230
15.1
656
77
75
81
400
19.0
-
66
64
70
230
-
84
82
92
230
19.1
839
89
87
97
230
19.5
848
96
94
101
400
23.8
-
81
79
86
230
-
kPa
kPa
kW
A
kW
A
2.2
1.0
0.66
2.88
-
3.3
2.1
0.66
2.88
-
0.66
2.88
20.0
31.86
0.66
2.88
-
4.0
2.0
0.77
3.36
-
6.0
4.0
0.77
3.36
-
0.77
3.36
25.0
39.59
0.77
3.36
-
Installation data
weight model F
model R
model C
electrical supply
max. heating capacity2
max. water volume2
max. water pressure loss2
- incl. three-way valve
- excl. valve
max. power motors
max. current motors (1 phase)
max. power consumption heating
max. current consumption incl. fans (3 phases)
DF M-150
1
1020
5.3
43
Basic data
max. door width
installation height
room temperature
DF M-100
W2 1
Installation data
weight model F
model R
model C
electrical supply
max. heating capacity2
max. water volume2
max. water pressure loss2
- incl. three-way valve
- excl. valve
max. power motors
max. current motors (1 phase)
max. power consumption heating
max. current consumption incl. fans (3 phases)
DF M
1 The 2-row heating coil (W2) is suitable for the water ranges 80/60 °C and 90/70 °C and the 4-row heating
between 45/35 °C and 70/50 °C. 2 The W2 is based on a water range of 80/60 °C and the W4 on 60/40 °C (water heating).
3 Electric heating: it is possible to choose 0, 50 or 100% of the heating capacity at every speed.
coil (W4) for low water temperatures
9
Technical data
Basic data
max. door width
installation height
room temperature
cm
cm
ºC
General selection data
Speed
air volume
heating capacity
sound pressure level at 3 m
m³/h
kW
dB(A)
100
300 - 350
20
150
300 - 350
20
2
1500
6.7
48
3
1875
7.6
54
2
2050
10.6
48
3
2635
12.3
54
E3
A
W2 1
W4 1
E3
A
kg
kg
kg
V
kW
l/h
33
32
36
230
7.3
321
35
33
38
230
7.6
331
37
36
39
400
9.5
-
31
30
33
230
-
47
46
52
230
11.9
521
50
49
55
230
12.3
535
54
53
57
400
14.3
-
46
45
49
230
-
kPa
kPa
kW
A
kW
A
0.5
0.2
0.58
2.52
-
0.6
0.3
0.58
2.52
-
0.58
2.52
10.0
17.02
0.58
2.52
-
1.3
0.6
0.77
3.36
-
1.9
1.1
0.77
3.36
-
0.77
3.36
15.0
25.10
0.77
3.36
-
cm
cm
ºC
Speed
air volume
heating capacity
sound pressure level at 3 m
m³/h
kW
dB(A)
1
2345
13.4
46
DF L-200
DF L-250
200
300 - 350
20
250
300 - 350
20
2
2995
15.7
51
3
3755
18.0
56
1
2755
16.6
45
2
3550
19.5
51
3
4510
22.7
56
W2 1
W4 1
E3
A
W2 1
W4 1
E3
A
kg
kg
kg
V
kW
l/h
63
61
69
230
17.4
762
67
65
73
230
18.0
782
73
71
76
400
19.0
-
62
60
65
230
-
79
76
86
230
21.9
961
84
81
91
230
22.7
984
91
89
95
400
23.8
-
76
74
80
230
-
kPa
kPa
kW
A
kW
A
3.0
1.4
1.15
5.04
-
4.5
2.8
1.15
5.04
-
1.15
5.04
20.0
34.02
1.15
5.04
-
5.1
2.6
1.34
5.88
-
7.9
5.2
1.34
5.88
-
1.34
5.88
25.0
42.11
1.34
5.88
-
Installation data
1 The 2-row heating coil (W2) is suitable for the water ranges 80/60 °C and 90/70 °C and the 4-row heating
10
1
1580
9.0
43
W4 1
General selection data
weight model F
model R
model C
electrical supply
max. heating capacity2
max. water volume2
max. water pressure loss2
- incl. three-way valve
- excl. valve
max. power motors
max. current motors (1 phase)
max. power consumption heating
max. current consumption incl. fans (3 phases)
DF L-150
1
1170
5.8
42
Basic data
max. door width
installation height
room temperature
DF L-100
W2 1
Installation data
weight model F
model R
model C
electrical supply
max. heating capacity2
max. water volume2
max. water pressure loss2
- incl. three-way valve
- excl. valve
max. power motors
max. current motors (1 phase)
max. power consumption heating
max. current consumption incl. fans (3 phases)
DF L
between 45/35 °C and 70/50 °C. 2 The W2 is based on a water range of 80/60 °C and the W4 on 60/40 °C (water heating).
3 Electric heating: it is possible to choose 0, 50 or 100% of the heating capacity at every speed.
coil (W4) for low water temperatures
Explanation of technical data
Coil
type
W2
W4
Water
range
(ºC)
Room temperature
(ºC)
+15 +18 +20 +22
90/70
1.35 1.28 1.23 1.19
80/60
1.12 1.05
70/50
1.58 1.46 1.39 1.31
60/40
1.20 1.08
50/40
1.06 0.94 0.87 0.79
45/35
0.87 0.75 0.68 0.60
1
1
0.95
0.92
mw =water volume [l/h]
Q
=heating capacity [kW]
ρw =density of water at 90 °C
(= 0.984) [kg/l]
Cpw =specific heat of water
(=4.18) [kJ/kg°C]
∆Tw=temperature difference water [°C]
Heating capacity
The maximum heating capacity stated in the tables on page 8, 9 and 10 are based
on a water range of 80/60 °C regarding the 2-row heating coil and 60/40 °C
regarding the 4-row heating coil. If different water or room temperatures are used,
the max. heating capacity may be multiplied by the factors from the table alongside.
Water volume
If different values than the ones stated in the tables on page 8, 9 and 10 are concerned, the water volume may be roughly calculated using the formula below. To do
so, the heating capacity must first be calculated (see table above).
mw =
Q
•
ρw C pw ∆Tw
3600 [ l/h]
Water pressure loss
∆pw =water pressure loss, table
1
values [kPA]
∆pw =water pressure loss [kPA]
2
mw =water volume, table values [l/h]
1
mw =water volume calculated using
2
formula above [l/h]
If different water temperatures are concerned, the water pressure loss may be roughly calculated using the formula below. To do so, the water volume must first be
calculated using the formula above.
∆ pw = ∆pw
2
1
mw
( mw )
2
2
[kPa]
1
Sound
The sound data stated in the tables on page 8, 9 and 10 are based on the direct
field, in situations with open doors and sound-absorbing ceilings. Sound data for
other conditions may be determined by adding the following values to the table
values below. Closed door: + 1 à 2 dB(A), and acoustical “hard” ceiling: + 2 à 3
dB(A). For other distances, or for multiple units next to each other, the values below
should be added to the sound data.
Correction factors in dB(A)
Distance 1.0 m
1.0 m
+4.8
2.0 m
+1.8
3.0 m
0
4.0 m
-2.5 5.0 m
-4.4 1.5 m
+6.2 +3.4 +1.7
-0.8 -2.7 Total unit width
2.0 m
2.5 m
3.0 m
3.5 m
+7.1 +7.6 +8 +8.3
+4.5 +5.3 +6 +6.4
+2.9 +3.8 +4.5 +5
+0.4 +1.4 +2.1 +2.7
-1.5 -0.5 +0.2 +0.8
11
Dimensional sketches
free-hanging model (F)
Threaded rods M81
52
A
52
290
35
Connector
connection
Supply
43.3
Connection G1"
female thread
51
28
70
Return
270
570
Air outlet grille
with rectifier
Type
DF S/M/L
L
A
1000
896
1500
1396
2000
1896
2500
2396
82.5
L
Notes:
• All dimensions are in mm.
1
The 1000, 1500 and 2000 mm versions feature a 4 x M8 internal thread, while the 2500 mm version has a 6 x M8 internal thread.
12
Dimensional sketches
cassette model (C)
Threaded rods M81
A
31.5
26
Connector
connection
31.5
Supply
43.3
43
28
275
641
Connection G1"
female thread
26
Return
Finishing sections are supplied separately
L1
731
L2
270
693
Type
DF S/M/L
L1
L2
A
C
1000
1040
937
958
1500
1540
1437
1458
2000
2040
1937
1958
2500
2540
2437
2458
82.5
196.5
C
Notes:
•All dimensions are in mm.
•Daylight openings (if cover mouldings are used): -for air discharge (L1 + 8) x 701 mm.
1
The 1000, 1500 and 2000 mm versions feature a 4 x M8 internal thread, while the 2500 mm version has a 6 x M8 internal thread.
13
Dimensional sketches
recessed model (R)
Threaded rods M81
52
A
52
35
Connector connection
290
Supply
51
43.3
Connection G1"
female thread
28
70
Free air-intake
above the ceiling
Return
Finishing sections are
supplied separately
270
465
S
Air outlet grille
with rectifier
83
C
119.5
L
L
DF S/M/L
L
A
C
1000
896
960
1500
1396
1460
2000
1896
1960
2500
2396
2460
S
50-115
79.5
Type
Notes:
• All dimensions are in mm.
• Daylight openings (if cover mouldings are used): -for air discharge 92 x (C+8) mm.
• For safety reasons electrical heated and ambient units come with a guard grille.
1
The 1000, 1500 and 2000 mm versions feature a 4 x M8 internal thread, while the 2500 mm version has a 6 x M8 internal thread.
14
Dimensional sketches
tourniquet model (T)
Connector connection
Supply
Connection G1"
female thread
Free air-intake
above the ceiling
Angle
Return
Radius (R)
Notes:
• All dimensions are in mm.
• Two givens are needed for an air curtain to fit around the curve of a revolving door, namely the angle and the radius (R).
• As regards the dimensions of the air curtain, please refer to the dimensioned sketch for the recessed model (R) on page 14.
• The selection of the type depends on the extended length of the revolving door.
15
Specifications
Casing
The casing is made of zinc-plated sheet steel, extra strengthened to minimize vibration
and has an inspection panel in the bottom. The air outlet grille with rectifier is made of
anodised aluminium. The unit is as a standard available in the following colours: white
(RAL 9016) or in aluminium (RAL 9006). Other RAL colours are available on request.
Motor / fan assembly
The air curtain has two or more (depending on type) dual-inlet vibration-free centrifugal
fans. Each fan is driven by a suspended rotor motor on ball bearings. The fan casing
(S and M) and the impeller are made of zinc coated plate steel. The fan casing of
model L is made of plastic. The motors are, as a standard fitted with thermal contacts.
The thermal contacts will break the circuit of the motor when the maximum permissible
motor temperature is exceeded.
Heating coil
The LPHW heating coil is made up of 3/8" copper pipes and aluminium fins. The distance
between the fins is 4.5 mm, which makes the unit easy to maintain. The water supply
connections are G1" female thread. The test pressure is 9 bars and the operating
pressure is max. 8 bars at 125 ºC. The electric heating coil is made up of U-tubeshaped, stainless pipes.
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 14 24
e-mail export@biddle.nl
internet www.biddle.info
DoorFlow.EX-en.2012-10.PDF•12091928
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