Drop BX-20-201 User manual

Operating Instructions
SYSTEM: BX - 20- 201

DROP appreciates you for the purchase of its
products and they inform you that as much in its
production as in its design they have put all its care.
Detailed reading of this manual will help you in the
system installation and good operation for many
years. Do not forget to give to the end user this
information when making the filtrate system starting,
in problem avoidance and for the correct use of the
systems.
All the systems need of a periodic maintenance,
revisions, consumable replacements, in function of the
qualities of the waters and of the work conditions. A
competent technician should advise the selection of
the system and filtering equipment, as well as its
measurement
design
and
operation
conditions
.
The
INTRODUCTION
measurement
design
and
operation
conditions
.
The
qualities of the waters can vary with the step of the
time and consequently the filters can work in a
different way.
Any suggestion of you, about our products or about
this manual, will be very received and rewarded in its
case.
In case of doubt, consult with your supplier..

General recommendations
INTRODUCTION
• In small facilities, with few filter elements, it is
recommendable to install a sustaining pressure
valve under the filtrate system, with the purpose of
guaranteeing sufficient pressure for the backwash
process of. This valve must go provided with a
control mechanism (electrical
or hydraulic) that manages its total opening during
the filtration process.
• In any case, whenever the installation does not
allow to maintain necessary the sufficient pressure
for the backwash one, it is advisable to place a
manual valve when coming out (of butterfly),
regulated properly to stabilize the pressure.
• With the purpose of eliminating the air that
could arrive at the filter elements, he is
recommendable to place a vent valve in an
advisable place of the system.
•
In
order
to
avoid
the
inverse
flow,
from
the
•
In
order
to
avoid
the
inverse
flow,
from
the
irrigation towards the filtrate, before a
shutdown of the pumping system, the
installation of a retention valve is advisable, in
cases in that the height waters down is greater
than where the
pressure system is located.
• With the purpose of being able to eliminate
the water of the system for operations of
maintenance one is due to have a purge valve.
• The use of satellites filters in the water
takings of the irrigation sectors
eliminates risks of cloggings of emitters.
These cloggings could be caused by the
grain formation by agglutinations of
dissolved substances that precipitate
throughout the conduction. Also risk of
clogging by a possible accidental
breakage of the conduction is run.
• As protection against overpressures
safety valves can be installed in the
system.

FILTERING MEDIA
Media
Data
:
Media
Data
:
Two factors describe the media used in the filter “Uniformity Coefficient” is an
index of the variability of the particle sizes in a sample. Sand particles must be as
uniform as possible for better control of the filtration since only particles large
enough to clog emitters should be retained of the filter. Grading in size from fine to
coarse causes premature clogging of the filter, since even small particles, which
can be tolerated from the emitters are retained from the non-uniform pores of the
media. Uniformity coefficient is expressed by the ratio: (size of the screen opening
which will pass 60% of the filter sand) / (size of the screen opening which will pass
10% of the same filter sand).
“Mean Effective sand Size” is and indicator of the particle size that will be
removed by
the media. It is expressed by the size of the screen opening, which will pass 10%
of the
sand sample.

TECHNICAL FEATURES
•MAX. NOMINAL FLOW: 30 m3/h (CLEAN WATER)
•OPERATING FLOW: 16 m3/h (RIVER WATER)
•OPERATING FLOW: 12 m3/h (CANAL WATER)
•MAX. OPERATING PRESSURE: 8 bar
•MIN. OPERATING PRESSURE: 2-2,5 bar
•TOTAL FILTRATION AREA: 0.40 m2
•TOTAL REQUIRED SILICA SAND: 260 Kg ( 10 BAGS)
•INLET – OUTLET: 3’’ (DN80) flanged
•FLANGES: DIN 2576
•THREADS: BSP
•Coating: Polyester electrostatic painting-oven baked

CONTENTS
A/A DESCRIPTION QUANTITY
1SAND MEDIA FILTERS X2’’-20’’ 2 pcs
2SCREEN FILTER O3’’ (120-mesh) FLANGED 1 pcs
3COLLECTORS 2 pcs
43WAY BACKWASHING VALVES 2’’x2’’ FLANGED 2 pcs
5SOLENOID VALVES 24VAC 2 pcs
6CONTROLLER 2 STATION TYPE T2(AC) & DP 1 pcs
7METAL SUPPORT FOR CONTROLLER 1 pcs
8AIR RELIEF VALVE 1’’ DOUBLE ACTION 1 pcs
11 SEALS 2’’ 4 pcs
12 SEALS 3’’ 1 pcs
13 BOLTS 5/8’’x60 + NUTS 20 pcs
14 METAL FLANGES MALE THREADED 2’’ 4 pcs
15
RAKOR PVC
Φ
63x2’’
2 pcs
15
RAKOR PVC
Φ
63x2’’
2 pcs
16 TEE PVC Φ63 1 pcs
17 ELBOW 90ΟPVC Φ63 1 pcs
18 DRAIN PIPE Φ63 /6atm 1m
19 PRESSURE GAUGE 0-10BAR (GLYCERIN) 2 pcs
20 PLASTIC FILTER 1’’ 1 pcs
21 NIPPLE 2’’ 2 pcs
22 METAL SUPPORT BASE 1 pcs
23
24
25
26

INSTALLATION
Guidelines
• Install the sand media filters X2’’-20’’ according to the design
• Connect the metal flanges to the outlets of each sand media filter.
• Connect the 3’’outlet manifold downstream and place the metal support.
• Connect the two nipples 2’’ to the inlet of each sand media filter.
• Connect the backwash valves 2’’x2”΄flanged in the inlet of each sand media filter
• Connect the metal flanges 2’’ male threaded to each valve of sand media filter.
• Connect the 3’’ inlet manifolds to the backwash valves by using the rubber flanges -
bolts 5/8x60 & nuts contained in this delivery.
UP TO THIS PHASE ALL THE BOLTS & NUTS SHOULD BEUP TO THIS PHASE ALL THE BOLTS & NUTS SHOULD BE
LOOSELOOSE--JOINTEDJOINTED
SO TO REALIZE, IF NECESSARY, ANY MODIFICATIONSSO TO REALIZE, IF NECESSARY, ANY MODIFICATIONS
• Join the 3’’ screen filter to the outlet collector
• As soon as you finish the installation properly and according to the relative designs,
tighten all the bolts & nuts so to secure the system
•
Install
to
the
2
’’
outlet
of
each
backwash
valve
,
the
drainage
assembly
•
Install
to
the
2
’’
outlet
of
each
backwash
valve
,
the
drainage
assembly
• When all the drainage parts are connected cut the Φ63mm PVC pipe in pieces
according to the instructions (design) and connect them to the system
• At the end of the drainage assembly you may install a pipe so to flash the dirty water
into the drain (optional)
• Install the 1’’ air release valves to the upper 1’’ socket of the inlet manifold (air valve
always on the higher part of the system) and the 1’’ plastic filter to the side 1’’socket
• Hydraulic and Electric connections should be realized according to the relative
design
• Place the controller’s support at the inlet manifold
• Input power: 220VAC (owner’s manual attached)
Output : 24VAC
Solenoids: 24VAC

INSTALLATION
1. Assemble on a level flat surface and place filters following design, connecting
water inlet/outlets as the arrows indicate.
2. Put water in the sand filters, filling them half way through.
3. Sand should be softly introduced according to the amount indicated in each filter.
4. Back flush 3 or 4 times : pressure should not be higher than 8 bar. In that way, the
small particles that sometimes come in silica sand will be removed.
5. Headers work with pressure, never at low pressure.
6. Programmer input voltage must be checked.
7. Connect the water inlet to the pressure differential gauge on the programmer itself
marked ‘H’ (or red pipe). The water outlet should be connected to the inlet in the
presostat marked ‘L’ (or black pipe).
WARNING: try not to break the presostat connections by excessive pressing. Use a
second pair of pliers or wrench when tightening.
10. Plug the base the programmer.
11. Adjust the presostat between 0,5 and 0,8 bar (Kg/cm²) .
12. Regulate the backflushing length time (it must be such that allows you to return to
the filtration position, reducing duct loss). When backflushing, check that water is
being flushed out through the drainage outlet, clear at the beginning, then dark and
afterwards clear again.At this moment the backflushing time is over.
13. The time between cleanings starts when the backflushing is over and the successive
filter begins to backwash. It is used to recover pressure in the header and in the
irrigation
network
.
irrigation
network
.
14.The minimum working pressure is 2-2.5 bar(Kg/cm²). Until it doesn’t have the
minimum pressure is usual that water goes out by the drainages.
15. The maximum pressure is 8 bar (Kg/cm²) or special ones for higher pressure.
16. Standard programmer voltage: 220V at 50 or 60 Hertz. Output voltage is 24V
standard.
17. Special programmer voltage: 12V battery DC input and 12V DC output. 12V battery
input and latching output may also be used, making use of bipolarity by 2 wires to
the solenoid (see solenoid part).
18. Programmers have an outlet for a master valve which gives a signal from the
beginning to the end of the backflushing. It may be used for several purposes.
19. Every valve and solenoid discharges water in each cycle, otherwise either check or
clean them.
20.Attention should be paid to the electric connection design.
21. Solenoids may have in their bases a manually controlled opening switch that
cancels automatism. This switch must be set at the vertical (auto) position.
22. Should you have any doubt, please consult your seller.

OPERATION
Filtration
The water enters from the top of the unit through the backwash valve and is being
cleaned as it penetrates into the bed of sand where the solids are trapped and
discharged from the bottom of the filter.
To avoid filter medium (sand) being taken
away, diffusers are fitted at the lower side of the filtration chamber.
Screen filters are installed downstream to the
system to retain any fine particles that may pass
from the sand media filters.
IN CASE OF A VERY BAD QUALITY OFIN CASE OF A VERY BAD QUALITY OF
INCOMING WATER WE SUGGEST TO REDUCEINCOMING WATER WE SUGGEST TO REDUCE
THE FLOW INTHE FILTRATION IN ORDER TOTHE FLOW INTHE FILTRATION IN ORDER TO
ACHIEVE BETTER FILTRATION RESULTSACHIEVE BETTER FILTRATION RESULTS

OPERATION
Backwash:
Upon receiving a command from the controller the backwash valve shuts off supply
and opens drain. Filtrated water from the other media units flows on the reversed
direction and flushes out the entrapped contaminants.

OPERATION
Controller:
The controller’s set-up depends on the local conditions and the quality of the water.
Here by you will find our recommendation, which should be adapted accordingly.
Periodic time: 4h (and/or at least once per day)
Flush time: 120sec
Dwell time: 15sec
PD switch: 70kPa (0,7bar)
IT IS VERY IMPORTANT TO HAVE DOWNSTREAM PRESSUREIT IS VERY IMPORTANT TO HAVE DOWNSTREAM PRESSURE
AT LEASTAT LEAST 22--22,5,5BAR TO ACHIEVE BETTER BACKWASH RESULTBAR TO ACHIEVE BETTER BACKWASH RESULT

MAINTENANCE
Instructions
Replace the sand when the amount of dirt that cannot be backflushed
prevents the proper functioning of the filter (recommended every 2-3
years)
• Open gently the plug at the bottom of the media filter and drain all the water
• Empty the sand from the filter through the bottom manhole
• Rinse thoroughly the inside surface of the filter
• Close the side gate with the cover and tighten properly
Dismantle periodically the screen filters in order to clean the screen
• Open the cover
• Take out the cartridge and rinse it thoroughly with clean water under 13pressure
Repair promptly any damage to the protective coating of the filter
• Clean thorougly the damaged spot with a wire brush
• Apply the protective paint
• Repeat 2-3 times until the spot is covered adequately

PROBLEMS AND SOLUTIONS
The first of all is to detect if the problem is electric or mechanic and if the header is new
or it has been working before. Next we are going to explain the most common difficulties
you can find, with the most appropiate solutions:
1) The cleaning programmer is out of order
• Verify that the electrical tension arrives and it is the correct for the programmer
• Check fuse
• Check input voltage to programmer and output voltage to solenoids (12-24V when they
are activated).
• Fuse may often blow due to excessive consumption, short-circuit or humidity in the
solenoid connection terminal.
• Wrongly programmed programmer, with wrong outputs.
• Clean blocked solenoids due to inside piston or passing jet blocking.
• Batteries with a lower voltage than 12V may cause problems.
2) The solenoid valves doesn’t operate. It can be produced by failure of the
solenoids, if it is so, it is necessary interchange the contact base with other of the outlet.
Look the solenoids part and press attention at the impulse ones because they can suffer
seizure.
3) Water flushing out throught drainage.
• Low pressure (the minimum pressure is 2bar). Install a ball valve or a pressure
sustaining valve to the drain pipe so increase the pressure inside the system during the
bakwashing.
• Install a main valve to the outlet of the system and regulate to close during backwash
so to increase the pressure and have better results.
• Valve blocked by a strange object.
• Solenoid blocked by a strange object, or it is not the right one, or it is not placed in its
position.
• Wrongly assembled latching solenoids.
5) Heavy duty loss
• Short time used for cleaning.
• Blocked solenoids that do not work.
• Too much flow.
• Excessive debris.
• Filtering sand that has become compact and solid (replace).
• Blocked cleaning valves because of a strange object.
• Wrong assembly of cleaning valves.
• Clogged auxiliary feeding filter.
• Clogged outlet screen filters (clean by hand).
• Functioning at low pressure.

PROBLEMS AND SOLUTIONS
6) Losses of silica sand during backwashing.
• Flow is to high. Decrease the flow.
• Quantity of silica sand bigger than it needs. After a few cleanings(3-4) will become in
normal position.
• Install a ball valve at the drain pipe and throttle till the point you don’t have losses or
install a pressure sustaining valve.
7) Bad quality of filtration.
• Too much flow. Decrease.
• Excessive debris. Regulate for more frequent cleanings.
• Low pressure, bad cleaning, increase the pressure in the system.
• Not the appropriate size of the filters. Contact with the technical department.
8) Continuous cleanings.
• Check the controller.
• Check the differential pressure gauge.
• Excessive debris. Increase the flush time.
• Wrong or bud quality of silica sand.
In any case of problem that is not easy to give a solution please contact with the
technical department o the company as soon as possible.
technical department o the company as soon as possible.

COLLECTING SYSTEM
PAY ATTENTION TO THE DIFFUSSERS SLOT OPENING REGARDINGPAY ATTENTION TO THE DIFFUSSERS SLOT OPENING REGARDING
THE TYPE OF SILICA SAND YOU WILL USE. IF YOU WILL USE SILICATHE TYPE OF SILICA SAND YOU WILL USE. IF YOU WILL USE SILICA
SAND TYPE 1.2SAND TYPE 1.2--2.4mm YOU MUST USE DIFFUSERS WITH SLOT2.4mm YOU MUST USE DIFFUSERS WITH SLOT
OPENING 0.5mm. IF YOU WILL USE SILICA SAND TYPE 0.5OPENING 0.5mm. IF YOU WILL USE SILICA SAND TYPE 0.5--0.8mm YOU0.8mm YOU
MUST USE DIFFUSERS WITH SLOT OP[ENING 0.2mm.MUST USE DIFFUSERS WITH SLOT OP[ENING 0.2mm.

CONTROLLER
Please advise the attached documents of this
manual at the end