Skov DA 50-920 Manual

DA 50-920
Technical User´s Guide

2 Technical User´s Guide
DA 50-920
CONTENTS
1PRODUCT DESCRIPTION 4
2MOUNTING GUIDE 5
2.1 Introduction to the Mounting..............................................................................5
2.1.1 The Appendixes are divided as follows:.......................................................................... 5
2.2 Placement in the House ......................................................................................5
2.2.1 Examples of Placement in the House ..............................................................................6
2.3 General Mounting ................................................................................................7
2.3.1 General Drawings............................................................................................................. 7
2.3.2 Assembling of Ducts.......................................................................................................... 9
2.3.3 Assembling of several Lengths of Duct........................................................................... 9
2.3.4 Assembling of Duct and Funnel Tube........................................................................... 10
2.3.5 Mounting of Supporting Ring (433487) on Duct.......................................................... 10
2.3.6 Roof Flashing with Neoprene Cloth.............................................................................. 11
2.3.7 Roof Flashing with Roofing Felt.................................................................................... 12
2.3.8 Mounting of Bell Mouth on Duct................................................................................... 13
2.3.9 Mounting of Net on Bell Mouth..................................................................................... 13
2.3.10 Mounting of Rain Screen on Net................................................................................... 14
2.3.11 Mounting of Roof Cap on Net........................................................................................ 14
2.3.12 Fastening of Mounting Fitting (433491) on Duct......................................................... 14
2.3.13 Mounting of Adjustment Fitting with Spring on the Bottom Plate............................ 15
2.3.14 Mounting of Intermediate Plate (optional equipment) and Bottom Plate................. 15
2.3.15 Mounting of Recirculation Fan (optional equipment)................................................. 16
2.3.16 Measuring and Mounting of Pull Rod .......................................................................... 17
2.3.17 Mounting of Suspension................................................................................................. 18
2.3.18 Fastening of Air Supply Unit to Pull Rod..................................................................... 18
2.4 Adjustment of DA 50-920 Air Supply Unit .......................................................19
3INSTALLATION GUIDE 20
3.1 Cable Chart for Recirculation Fan....................................................................20
3.2 Wiring Diagram for Recirculation Fan .............................................................21
3.3 Diagram for Rotating Direction of the Recirculation Fan...............................22
4EC DECLARATION OF CONFORMITY 22
5USER’S GUIDE 23
5.1 Cleaning..............................................................................................................23
5.1.1 Dismantle Bottom Plate and Intermediate Plate for Cleaning................................... 23
6MAINTENANCE INSTRUCTIONS 23
6.1 Instructions for taking down the Unit and Recycling.....................................23
7TROUBLE SHOOTING INSTRUCTIONS 24

Technical User´s Guide 3
DA 50-920
8SPARE PARTS 25
9TECHNICAL DATA 27
9.1 Dimensioned Sketch DA 50-650 (in mm).........................................................27
9.2 Dimensioned Sketch DA 50-920 (in mm).........................................................28
9.3 Tensile Force......................................................................................................29
9.4 Air Output...........................................................................................................29
9.5 Technical Data Recirculation Fan ....................................................................29
10 APPENDIX 1 30
10.1 Mounting Guide, Garret.....................................................................................30
11 APPENDIX 2 31
11.1 Mounting Guide, free hanging Roof.................................................................31
12 APPENDIX 3 33
12.1 Mounting Guide, free hanging Ridge...............................................................33
13 APPENDIX 4 35
13.1 Mounting Guide, Roof through Garret.............................................................35
14 APPENDIX 5 38
14.1 Mounting Guide, Ridge through Garret...........................................................38
15 APPENDIX 6 41
15.1 Mounting Guide, Monoblock House.................................................................41
16 APPENDIX 7 42
16.1 Mounting Guide, flat Roof.................................................................................42

4 Technical User´s Guide
DA 50-920
1Product Description
The DA 50 Air Supply Unit is an air inlet, which combines high output with low air velocity in the
area occupied by the birds.
DA 50-650 performs up to 12,250 m3/h at 40 Pa negative pressure.
DA 50-920 performs up to 18,000 m3/h at 40 Pa negative pressure.
The high output is obtained without the use of a fan.
DA 50 has a parallel motion system, which ensures that the air supply unit opens uniformly all the
way around. This ensures a uniform air distribution in the entire house.
The 100 % stepless control ensures that the system can be adjusted to the required air jet range during
the concerned period of the year. Thus, it is possible always to make a combination of negative
pressure and opening, which provides the required relation between output and air velocity.
DA 50 is cast in double shell fibreglass for better insulation.
DA 50-650
A DA 50-650 Roof cap
B DA 50-650 Net
C DA 50-650 Rain screen
D DA 50-650 Bell mouth
E DA 600 Roof duct
F DA 600 Roof sheet
G DA 600 Duct
H DA 50-650 Funnel tube complete
I DA 50-650 Intermediate plate
J DA 50-650 Bottom plate
K DA 50-650 Recirculation fan
DA 50-920
A DA 50-920 Roof cap
B DA 50-920 Net
C DA 50-920 Rain screen
D DA 50-920 Bell mouth
E DA 50-920 Neoprene cloth
F DA 50-920 Duct
G DA 50-920 Supporting ring
H DA 50-920 Funnel tube complete
I DA 50-920 Intermediate plate
J DA 50-920 Bottom plate
K DA 50-920 Recirculation fan

Technical User´s Guide 5
DA 50-920
2Mounting Guide
2.1 Introduction to the Mounting
Check that all ordered parts are present and intact according to the delivery note before you start your
work.
This chapter concerns the general mounting of the DA 50-920 unit, regardless of the type
of building in which it is to be mounted.
As an appendix at the end of the document, you find supplementary mounting guides,
which define the specific mounting conditions depending on the type of building
concerned.
2.1.1 The Appendixes are divided as follows:
Appendix 1, Mounting Guide, Garret
Appendix 2, Mounting Guide, free hanging Roof
Appendix 3, Mounting Guide, free hanging Ridge
Appendix 4, Mounting Guide, Roof through Garret
Appendix 5, Mounting Guide, Ridge through Garret
Appendix 6, Mounting Guide, Monoblock House
Appendix 7, Mounting Guide, flat Roof
2.2 Placement in the House
Place the DA 50-920 units in the house according to the enclosed drawing; however, the placement
depends on purlins, rafters etc. Contact SKOV A/S if there are considerable deviations.
Place the DA 50-920 units evenly distributed with the same spacing in the whole house. The two units
at each end of the house may be placed proportionally farther from the gable to reduce down draught
along the gable.
Check that all DA 50-920 units can be placed freely in relation to other equipment, which may be
mounted later, such as feed lift, water etc., however, as agreed with the building owner.
NB: Note the diameter of the plates for the DA 50-920 units when lifting them past the feed lift, water
etc.
With using Ø920 ducts, it may be an advantage to increase the distance between purlins/rafters where
the DA 50-920 unit is to be placed, and possibly use a stronger purlin/rafter on each side of the unit,
however, as agreed with the building owner. In case of a renovation, however, this is not possible, and
the unit must be placed in the best possible way.
NB: Without affecting the output, the duct can be pressed to a square of c 750 × 750 mm where it
passes purlins/rafters. Use a duct of 1500 mm for this purpose. The duct must be placed so that it is the
middle of the duct, which is placed by the purlins/rafters. Hereafter the duct can be reshaped to
circular form and mounted with the other parts for the unit.
The pull rod must be placed left of the DA 50-920 when you look towards the winch
motor. This also means that you must make sure that the large wire lock of the DA 50-920
funnel tube is to the left.

6 Technical User´s Guide
DA 50-920
IMPORTANT: If an insulated duct is to be mounted, see instruction 603819, which is enclosed with
the insulated duct.
IMPORTANT: If a recirculation fan is mounted, the distance from floor to fan must comply with the
current requirements and standards. According to DS/EN 294, the distance must be minimum 270 cm.
2.2.1 Examples of Placement in the House
Figure 1
Example of a 50 m long house with one winch
motor.
Figure 2
Example of a 100 m long house with two winch
motors.

Technical User´s Guide 7
DA 50-920
2.3 General Mounting
2.3.1 General Drawings

8 Technical User´s Guide
DA 50-920
1. When the funnel tube and one duct are assembled, these parts are to be mounted from the
house up through the hole in the ceiling.
2. Push the supporting ring down over the duct end and fasten it to the duct and the wooden
frame. Remember that roles on the funnel tube must be turned lengthwise of the building. See
section 2.2.1.
3. Mount the splicing sleeve on the duct end.
4. Assemble the next duct and mount it down into the splicing sleeve.
5. Possibly reduce the duct at the top.
6. Press the cloth down over the duct end and fasten it to the roof sheets.
7. Mount the roof cap complete on the duct end.

Technical User´s Guide 9
DA 50-920
2.3.2 Assembling of Ducts
50 mm
750 mm : 522166
1500 mm : 522170
650 mm : 522169
1400 mm : 522170
3,5 mm
PH TORX 25 A2-70
357700
Figure 3
The distance from the edge of the duct to the edge of the strap must be 50 mm.
Assemble by means of the enclosed PH TORX 25 A2-70 screws which are to be placed
according to the marking-out and drilled holes on the strap.
2.3.3 Assembling of several Lengths of Duct
3,5 mm
PH TORX 25 A2-70
357700
Figure 4
Use a splicing sleeve for assembling of the two lengths of duct.
Mount the splicing sleeve 500 mm onto each duct end.
Assemble by means of the enclosed PH TORX 25 A2-70 screws which are to be placed
according to the marking-out and drilled holes on the splicing sleeve.

10 Technical User´s Guide
DA 50-920
2.3.4 Assembling of Duct and Funnel Tube
Figure 5
Place the duct on the outside of the recess plane of the funnel tube.
Drill eight Ø6.5 mm holes as marked out in the funnel tube, i.e. the holes must be drilled from
the inside and out through the duct.
Assemble the funnel tube and the duct by means of eight M6×25 bolts, eight M6 nuts and
sixteen washers.
2.3.5 Mounting of Supporting Ring (433487) on Duct
Figure 6
Place the supporting ring on the outside of the duct.
Drill sixteen Ø6.5 mm holes as marked out in the supporting ring. Assemble the supporting
ring and the duct by means of sixteen M6×25 bolts, sixteen M6 nuts and 32 washers.
NB: Fasten the supporting ring by means of four wood screws down into the wooden frame.
Remember that roles on the funnel tube must be turned lengthwise of the building. See section
2.2.1.

Technical User´s Guide 11
DA 50-920
2.3.6 Roof Flashing with Neoprene Cloth
Y
X
20
0
Cut out an adequate hole in the roofing sheet
With a 20oroof pitch. X= 780 mm. Y= 840 mm
The hole in the neoprene cloth must be approx.
15cm smaller than the diameter of the exhaust
unit. Note that at a roof pitch of 20o, the largest
diameter of the ellipse is 6 cm larger.
Apply a stripe of glue on the roofing sheet.
Apply a stripe of glue on the periphery of the
roofing sheet approx. 15cm above roof.
Pull the cloth into place over the duct and spread
it properly on the roof.
Place the top roofing sheets over the cloth.
Mount various screws for fixation of cloth and
roofing sheets.

12 Technical User´s Guide
DA 50-920
2.3.7 Roof Flashing with Roofing Felt
Begin by fastening small strips of roofing felt to the roof and the duct with a burner.
Finish by fastening a strip of roofing felt all the way around the duct with a burner.

Technical User´s Guide 13
DA 50-920
2.3.8 Mounting of Bell Mouth on Duct
M6x25 mm
(357065)
M6
(352823)
Ø6,4/30x1,5 mm
(419240)
Figure 7
Place the bell mouth down over the duct end.
Drill eight Ø6.5 mm holes as marked out in the bell mouth.
Assemble the bell mouth and the duct by means of eight M6×25 bolts, eight M6 nuts and
sixteen washers.
2.3.9 Mounting of Net on Bell Mouth
Figure 8
Drill eight Ø5.5 mm holes as marked out in the bell mouth.
Assemble the bell mouth and the net by means of eight holders for wire mesh, eight 5×30 mm
screws and eight washers.
NB: The groove in the holder for wire mesh must engage with the wire at the bottom of the
net.

14 Technical User´s Guide
DA 50-920
2.3.10 Mounting of Rain Screen on Net
Figure 9
Drill eight Ø5.5 mm holes in each rain screen as marked out.
Mount the rain screen on the net by means of strips.
2.3.11 Mounting of Roof Cap on Net
Figure 10
Drill eight Ø5.5 mm holes as marked out in the roof cap.
Assemble the roof cap and the net by means of eight holders for wire mesh, eight 5×30 mm
screws and eight washers.
NB: The groove in the holder for wire mesh must engage with the wire at the top of the net.
2.3.12 Fastening of Mounting Fitting (433491) on Duct
Figure 11
Use four mounting fittings per unit. Place the mounting fitting on the outside of the duct.
Drill twelve Ø6.5 mm holes in the duct according to the holes in the mounting fittings.

Technical User´s Guide 15
DA 50-920
Assemble the mounting fitting and the duct by means of twelve M6×25 bolts, twelve M6 nuts
and twelve washers.
NB: Made for mounting on a flat concrete roof.
2.3.13 Mounting of Adjustment Fitting with Spring on the Bottom Plate
Figure 12
Predrill Ø3.5 mm holes at the centre marks in the bottom plate.
Mount the four adjustment fittings with springs on the bottom plate according to the sketch.
2.3.14 Mounting of Intermediate Plate (optional equipment) and Bottom Plate
Figure 13
Mount the intermediate plate (optional equipment) with string and bushes. Place the string up
around the horizontal black fitting.
Mount the bottom plate with wires and bushes.

16 Technical User´s Guide
DA 50-920
2.3.15 Mounting of Recirculation Fan (optional equipment)
2.3.15.1 Mounting of Recirculation Fan on Plate for Recirculation Fan
A
6x30 mm
(352795)
Figure 14
Predrill Ø3.5 mm holes at the centre marks.
Fasten the recirculation fan on the plate by means of four mounting fittings and four 6×30 mm
screws.
NB: The mounting fittings are in the box together with the recirculation fan.
2.3.15.2 Mounting of Contact Box on the Plate for Recirculation Fan
5x20 mm
(352793)
110 mm
Figure 15
Fasten the contact box on the plate by means of two 5×20 mm screws.
NB: It is important to observe the 110 mm measurement! Make sure not to drill/screw through
the plate, as this would allow water to leak into the cavity of the plate.

Technical User´s Guide 17
DA 50-920
NB: The power to the recirculation fan should be supplied by a watertight CE plug in view of
dismantling during cleaning.
2.3.15.3 Suspension of complete Recirculation Fan
(512039)
Figure 16
Mount the suspension for the recirculation fan in the four holes in the bottom plate.
Mount the plastic split pin from below and up through the hole.
Lift up the recirculation fan and mount it in the suspension.
2.3.16 Measuring and Mounting of Pull Rod
200 mm
Figure 17
Measure the pull rod.
Assemble the pull rods by means of a splicing sleeve, and mount an eye joiner at the end
nearest to the winch motor. Mount a DA 50 mounting set for decentralized winch motor in the
eye joiner.
Mount pull rods in the groove of the wheel holder.
NB: When the winch motor is completely closed, the pull rod must extend 200 mm from the
last wheel holder opposite the winch motor.
It is not necessary to use a coil spring. There is a back-pull of 15-25 kg from each air supply
unit.

18 Technical User´s Guide
DA 50-920
2.3.17 Mounting of Suspension
Figure 18
Mount a suspension for the pull rod with a spacing of three metres between each air supply
unit so that the pull rod is horizontal between the DA 50-920 units.
Press the S-hook around the chain so that it does not fall off during operation.
NB: Splicing sleeves are not to move past the suspension during operation. You may move the
suspension accordingly.
2.3.18 Fastening of Air Supply Unit to Pull Rod
Figure 19
Figure 20
The pull rod must be placed to the left of the DA 50-920. See section 2.2.1. This also means
that you must make sure that the large wire lock of the DA 50-920 funnel tube is to the left.
Run the winch motor to completely closed position.
Lift/pull the air supply units up to completely closed position. Tighten the wire with the large
wire lock and clamping sleeves for pull rod and mount it on the pull rod in the direction
towards the winch motor.
In view of later adjustment, only the first unit in each row, closest to the winch motor, should
be connected to the pull rod at first.

Technical User´s Guide 19
DA 50-920
2.4 Adjustment of DA 50-920 Air Supply Unit
The distance from the bottom of the drip nose (point a) of the air supply unit to the edge of the
intermediate plate (point c) must be c 150 mm. (Is delivered prefabricated in correct length).
The distance from the bottom of the drip nose (point a) of the air supply unit to the edge of the bottom
plate (point b) must be c 420 mm +/- 50 mm. The distance must be the same at all four suspension
points.
If the bottom plate does not have the same distance in one or more suspension points, you must loosen
the counternut and adjust the wing nut until there is the same distance at all four suspension points.
Remember to tighten the counter nut again.
SKOV A/S recommend using the following adjustment procedure:
The winch motor must open at slack and have a shift of c 375 mm.
Run the winch motor up and down three or four times so that it ends in a completely closed position.
Now check the following distances of the first air supply unit in each row:
The bottom plate must close completely. Adjust the four corners so that the springs have a pretension/
press of c 0.5 cm on the first unit in each row.
Then run the winch motor to completely open position. The distance between a and b must be c 420
mm +/- 50 mm. If this is not the case, the winch motor should be rewound. If this is OK, run the winch
motor to completely closed position again. Possibly check the pretension of the springs of c 0.5 cm
again.
Hereafter open the system so that there is c 1 cm opening between the air supply unit and the
intermediate plate. Find the shortest distance at the four corners; this must be c 1 cm. Adjust the
remaining three corners to c 1 cm also, possibly use an precision feeler gauge.
If the distance is not the same between the rows, the shortest distance must be used as basis.
Then connect the remaining units to the pull rod.
Now adjust the remaining units to the same distance as achieved for the first units. Remember that all
four corners must have the same distance.
After finishing the adjustment, run the winch motor to completely open position again. The distance
between point a and b must still be within c 420 mm +/- 50 mm.
NB: It is important that all units open evenly at minimum opening.
(It is less important if the units have the same opening at full opening).
Figure 21

20 Technical User´s Guide
DA 50-920
3Installation Guide
3.1 Cable Chart for Recirculation Fan
Figure 22
Level detector and switch may possibly be mounted in the controller/computer on a DIN bar.
A Switch must be used if there are more than three fans. Is not supplied by SKOV A/S.
NB: Power to the recirculation fan should be supplied by means of a watertight CE plug in
view of dismantling during cleaning.