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.