Secoh SLL-20 User manual

SECOH Service & Maintenance Manual - 0 - 31.10.07, sie
SERVICE MANUAL
SECOH AIR PUMPS
SLL-20, 30, 40 & 50
EL-60, 80-15, 80-17 & 100
EL-120W, 150 & 200

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Table of contents
1. Prior to maintenance and Service 2
2. Maintenance 2
3. Air filter cleaning / replacement 3
4. Valve box and diaphragm replacement 4
5. Resetting auto stopper 8
6. Magnet replacement 9
7. Diagnosis of failures 10
8. Technical Specification 11
9. Test data (resistance table) 12
10. Spares Kits and replacement parts 12

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•Always disconnect power supply before servicing. Failure to
do so could result in electrical shock, personal injury or
death.
•Do not touch live parts. Touching live parts will result in
electric shock.
1. Prior to maintenance and service
•Prior to maintenance and service, please read this manual carefully.
•Follow the safety instructions!
•Servicing and maintenance as described in this manual should be
carried out by an authorised service facility.
2. Maintenance
Cleaning the air filter
The air filter should be cleaned every 3 to 4 months to insure correct operation.
Occasional checks
Is air blowing out properly?
Is the air pump making abnormal noise or vibrations?
Is the temperature of the air pump not abnormally high?
Is the power cord or plug damaged or discoloured?
ÎIf any irregularity is found, read DIAGNOSIS OF FAILURES.

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3. Filter element cleaning or replacement
a) Undo the truss head screw of the filter
cover.
b) Remove the filter cover, by firmly
pulling it off.
c) Remove the filter element and brush
off any dust particles by hand.
If heavily clogged with dust, wash in a
neutral detergent followed by a
thorough rinsing in water. Allow to dry
in the shade. Note: Do not use
benzene or thinner to clean filter
element as it can be damaged!
d) After cleaning reassemble the filter
element back in place. Make sure to
put the harder side of the filter facing
downwards. Press in the filter cover.
e) Secure the filter cover by the truss
head screw.

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4. Valve box and diaphragm replacement
a) Undo the 4 corner bolts of the overall cover.
b) Remove the overall cover. If it is hard to
remove, insert a screwdriver in the slot
provided.
c) Pull out the bushing.
d) Remove the shock absorber
e) Undo the 4 screws of the holder cover.
Note: It is easier to change one diaphragm at a
time.
f) Insert the magnet support jig in the 4
corners, between the magnet and the core.
Note: The magnet support jig (carton strips)
is included in the service repair kit.

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g) Undo the 4 screws of the valve box.
h) Slide down the hose clamp, pull off the
connecting pipe and remove the valve box.
i) Undo the nut or bolt and remove the
diaphragm (Nut: SLL series & EL-60, 80-15
& 120W. Bolt: EL-80-17, 100, 150 & 200).
j) Set the new diaphragm and fix it by the nut
or bolt (torque, see table at appendix).
k) Insert the magnet supporter jig in the 4
corners between the magnet and the core.
Note: Make sure that the magnet is in the
centre of the solenoids.

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l) Install the new valve box and secure into
position using the 4 corner screws.
m) Replace opposite diaphragm following the
above procedure.
n) Pull out the magnet support jig.
o) Check the magnet is in a central position.
Note: The tolerance of the centring of the
magnet is within +/- 0.5 mm (see dimension “d”
of sketch in appendix).
p) Push on the connecting pipe and refit the
hose clamp.
q) Reset the auto stopper (If necessary)
r) Connect power cord to confirm proper
operation.
Danger: Do not touch live parts. Touching live
parts will result in electric shock!
s) Fasten the holder cover with the screws.

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t) Put the shock absorber back into place.
u) Insert the power cord bushing into the
location notch.
Note: It locates into the inner slot!
v) Replace the overall cover and secure by
using the nuts and bolts.
w) Replace air filter as previously described.
Secure filter cover using the truss head screw.

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5. Reset auto stopper (protective switch)
Function of auto stopper
A running Pump with a broken
diaphragm may cause a major break
down and excessive repair cost. To
prevent this from occurring, EL-
series pumps are equipped with a
protective switch.
If the diaphragm is broken, the
magnet reciprocates with abnormal
amplitude and the projection of the
magnet hits the slider of the auto
stopper. The contact is interrupted
and power is off.
Auto stopper reset
a) Follow the procedure of chapter 4 from a)
to e)
b) Set the slider at the position L1 = L2.
c) Follow the procedure of chapter 4 from r)
to w).

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6. Magnet replacement
a) Follow the procedure of chapter 4 from a) to i).
b) Remove diaphragm and pull out opposite
diaphragm and magnet from other side.
c) Assemble new magnet and diaphragm with
nut or bolt.
d) Insert the diaphragm and the magnet
between the solenoids. The projection should
be upward.
e) Install replacement diaphragm to opposite
side.
f) Follow the procedure of chapter 4 from k) to
w).

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7. Diagnosis of Failures
Problem Cause Action
Pump does not work Power plug is disconnected Plug in and check if
electricity is available
Cord is broken (Internal
wiring damaged) Check electrical continuity with circuit tester
Auto stopper activated Open cover to check for
damage on diaphragm
Excessive noise Valves or diaphragm are
damaged Open cover to check for damage or disconnection
L-Tube is damaged or
disconnected Re-connect or replace L-Tube
Pump is in touch with
surrounding articles. Re-position pump
Discharged air volume
decreases Air filter is clogged Clean or replace air filter
A
ir diffuser or pipe is
clogged Clean air diffuser and check piping
A
bnormal temperature
arises Air filter is clogged Clean or replace air filter
Air diffuser or pipe is
clogged Un-block air diffuser or pipe
Pump sometimes operates
and sometimes not. *
A
ir filter is or diffuser is
clogged Clean or replace air filter or diffuser
*A decrease in airflow (caused by clogged air filter or air diffuser) may lead to an
extraordinary rise in operating temperature. This will activate a thermal protector and
stop the pump. When the temperature reduces, the pump will automatically restart.
If in doubt about any service or maintenance procedures, please consult with
your local distributor.

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8. Technical Specifications
Model
SLL-20 SLL-30 SLL-40 SLL-50
Voltage V As shown in the name plate
Frequency Hz Applied to 50
Optimal Press. bar 0.2 0.2
Open Flow L/min 52 60 68 75
Max Power W As shown in the name plate
Outlet dia. mm OD 19 mm
Weight kg 4.5
Standard accessories L-Joint hose (with hose band)
Model
EL-60 EL-80-15 EL-80-17 EL-100
Voltage V As shown in the name plate
Frequency Hz Applied to 50
Optimal Press. bar 0.2 0.2 0.2 0.2
Open Flow L/min 105 115 120 145
Max Power W As shown in the name plate
Outlet dia. mm OD 19 mm
Weight kg 8.5
Standard accessories L-Joint hose (with hose band)
Model
EL-120W EL-150 EL-200
Voltage V As shown in the name plate
Frequency Hz Applied to 50
Optimal Press. bar 0.25
Open Flow L/min 225 265 310
Max Power W As shown in the name plate
Outlet dia. mm OD 27 mm
Weight kg 16
Standard accessories L-Joint hose (with hose band)

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9. Testing Data
a) Solenoid resistance table
Voltage: 230V, 50Hz
Tolerance: +/- 10%
SLL-20 & 30 models: Solenoids are in series connection
Other models: Solenoids are in parallel connection
Total R Single R
SLL-20 220.0 110.0
SLL-30 162.0 81.0
SLL-40 86.5 173.0
SLL-50 60.8 121.7
EL-60 36.7 73.4
EL-80-15 21.9 43.7
EL-80-17 33.1 66.2
EL-100 20.0 40.0
EL-120W 16.2 64.7
EL-150 16.6 66.2
EL-200 10.0 40.0
10. Spare Part Kits
Only use genuine SECOH replacement parts. Non-standard parts will have a
detrimental effect on overall pump life and performance.
In order to ensure long service and operation, it is recommended diaphragms and
valve boxes are replaced once a year.

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S L L S E R I E S
Contents Required kit
Qty
Kit Name Part No.
Code Parts
included Qty Pos
No SLL20 SLL30 SLL40 SLL50
Diaphragm 2 10
Diaphragm
holder 2 9
Nut 2 24
Valve box &
valve 2 11
Filter element 1 3
Filter cover
packing 1 2
Diaphragm
repair kit K-SLL-D EM-0359025
Tank base
packing 1 17
1 1 1 1
Magnet 1 8
Magnet K-SLL-M
EM-0351008 Nut 2 24
1 1 1 1
E L S E R I E S
Contents Required kit
Qty
Kit name Part No.
Code Parts
included Qty Pos
No EL60
EL80-15 EL80-17 EL100 EL120W EL150 EL200
Diaphragm 2 11
Diaphragm
holder 2 10
Nut 2 23
Valve box &
valve 2 12
Diaphragm
repair kit K-EL-D EM-0377007
Filter element 1 2
1 1 2 2
Magnet 1 9
K-EL60,80-15-M
EM-0374008 Nut 2 23
1 2
Magnet 1 9
MAGNET K-EL80-17,100-M
EM-0405000 Screw 2 23
1 2
S-EL60,80-15,120W
EM-0433004 Auto stopper 1 6 1 2
Auto stopper S-EL80-17,150,200
EM-0434000 Auto stopper 1 6 1 2

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Your local Distributor:
BIBUS (UK) Ltd
Unit 20 Soho Mills
Wooburn Green
Buckinghamshire
HP10 0PF
United Kingdom
Tel: [phone]
Fax: [phone]
Email: [email protected]
Homepage: www.bibus.co.uk