IWAKI PUMPS MDF-L250 User manual

Read this manual before use of product
IWAKI Magnetic Drive Pump
Model MDF-L
Instruction Manual
T313-2 99/9
( )Country codes
IWAKI CO.,LTD. 6-6 Kanda-Sudacho 2-chome Chiyoda-ku Tokyo 101-8558 Japan
TEL:[phone] FAX:[phone](http://www.iwaki-pumps.co.jp/)
Germany : IWAKI EUROPE GmbH
Italy : IWAKI Italia S.R.L.
Denmark : IWAKI Pumper A/S
France : IWAKI France S.A.
Switzerland: IWAKI (Schweiz) AG
U.K. : IWAKI PUMPS (UK) LTD
Sweden : IWAKI Sverige AB
Finland : IWAKI Suomi Oy
Austria : IWAKI (Austria) GmbH
Norway : IWAKI Norge AS
Holland : IWAKI Holland B.V.
Spain : IWAKI Iberica Pumps,S.A.
Belgium : IWAKI Belgium n.v.
TEL: [phone] FAX:[phone]
TEL: [phone] FAX:[phone]
TEL: [phone] FAX:[phone]
TEL: [phone] FAX:[phone]
TEL: [phone] FAX:[phone]
TEL: [phone] FAX:[phone]
TEL: [phone] FAX:[phone]
TEL: [phone] FAX:[phone]
TEL: [phone] FAX:[phone]
TEL: [phone] FAX:[phone]
TEL: [phone] FAX:[phone]
TEL: [phone] FAX:[phone]
TEL: [phone] FAX:[phone]
Singapore : IWAKI Singapore Pte. Ltd.
Indonesia : IWAKI Singapore (Indonesia Branch)
Malaysia : IWAKIm Sdn. Bhd
Taiwan : IWAKI Pumps Taiwan Co.,Ltd.
Thailand : IWAKI (Thailand) Co.,Ltd.
Hong Kong : IWAKI Pumps Co.,Ltd.
China :
IWAKI Pumps Co.,Ltd. (Shanghai office)
China : IWAKI Pumps Co.,Ltd. (Beijing office)
China :
IWAKI Pumps Co.,Ltd. (Guangzhou office)
Australia : IWAKI Pumps Australia Pty. Ltd.
U.S.A. : IWAKI WALCHEM Corporation
TEL: [phone] FAX:[phone]
TEL: [phone] FAX:[phone]
TEL: [phone] FAX:[phone]
TEL: [phone] FAX:[phone]
TEL: [phone] FAX:[phone]
TEL: [phone] FAX:[phone]
TEL: [phone] FAX:[phone]
TEL: [phone] FAX:[phone]
TEL: [phone] FAX:[phone]
TEL: [phone] FAX:[phone]
TEL: [phone] FAX:[phone]

Thank you for selecting the IWAKI Magnetic Drive Pump type MDF-L. This instruction
manual has been prepared to ensure correct and safe handling of the pump. Please read this
manual carefully and thoroughly prior to operating the pump.
Pay special attention to the "Safety Instruction to Prevent Personal Injuries," "Warning," and
"Caution" messages included in this manual.
This instruction manual should be kept by each end user and within reach of the actual
operator, for quick reference when needed.
Contents
IMPORTANT INSTRUCTIONS ················································ 1~~5
Safety Instructions to Prevent Personal Injuries
OUTLINE OF PRODUCT······················································ 6~~14
1. Before Using Pump ·································· 7
2. Operating Principle ··································· 7
3. Identification Codes ·································· 8
4. Specifications
and Outer Dimensions ····························· 9
5. Names of Parts ······································ 11
PUMP OPERATION ···························································· 15~~30
1. Handling Instructions ····························· 16
2. Installation ·············································· 21
3. Piping ····················································· 22
4. Wiring ····················································· 26
5. Operation Step ······································· 27
MAINTENANCE ··································································· 31~~43
1. Causes of Trouble
and Troubleshooting ································32
2. Maintenance and Inspection ·················· 35
3. Spare Parts ············································ 39
4. Disassembly and Assembly ··················· 40
Please contact the IWAKI sales office or IWAKI dealer for any
inquiries or questions regarding this product.

- 1 -
IMPORTANT INSTRUCTIONS
Important notes and statements for safe operation, preventing physical injury, and property damage,
are included on the body of the product and in the attached instruction manual.
Always Observe These Safety Instructions!
Safety Instruction to Prevent Personal Injuries
Warning Ignoring this message can lead to improper
handling resulting in death or serious injury to the
operator.
Caution Ignoring this message can lead to improper
handling resulting in injury to the operator or
damage to the product.

- 2 -
Caution
Wear
protective gear
Caution
Prohibited
Power off
Caution
Prohibited
Caution
Prohibited
Wear
protective gear
Safety Section
WARNING
•Damaged or deteriorated tools are very dangerous. Use qualified and suitable
tools only.
•Use of protectors: When disassembling, assembling, and conducting maintenance
or when handling a dangerous type of liquid or a liquid of unknown property, be sure
to wear safety gloves, a helmet, and protective shoes. In addition, when handling
wet-end parts, always wear protective goggles, masks, etc.
•To prevent death or injury from a falling pump, make sure the rope or chain used
for lifting the pump is not accidentally cut or disconnected during installation. Make
sure the rope or the chain used to lift the pump has sufficient strength in relation to
the pump load. Also, be sure not to stand underneath a lifted or suspended pump.
•When fixing the pump with rope or chain, be sure to use special bolts (or rings) for
lifting. Never use any other points for lifting the pump.
•Always turn off the power supply prior to servicing the pump. Make special pro-
visions so that no other operator mistakenly turns on the power supply while some-
one is working on the pump. In a noisy or poor visibity environment, display a sign
near the power supply switch to notify others that someone is "WORKING" on the
pump. Power supply mistakenly turned on during maintenance may lead to personal
injury. Each operator must be especially careful of power supply operation.
•To ensure greater safety, check and make sure that there is no one near the
pump when switching on the power supply. The pump is not equipped with an
ON/OFF switch. Connecting the power cable supplies the power to the pump and
starts the operation.
•Run the pump at the specified power supply voltage on the nameplate only.
Otherwise, fire or electric shock may result.
•If the pump operation is stopped due to a power failure or closure of discharge
wire, turn off the power switch at once. After normal conditions return, turn the
switch on again.
•Do not use the pump for anything that it is not designed to do. User’s failure to
observe this instruction exempts IWAKI from any responsibility for personal injury or
damage to the equipment or facility caused by the pump’s misuse.
•When handling a toxic or odorant liquid, ventilate the working area well. In addi-
tion, the operator must wear protector gear (such as a safety mask, safety goggles,
and protective gloves).

WARNING
•Do not allow toxic substances such as lubricants, solvents, or similar sub-
stances to flow into the local sewage system or river systems. Do not drain haz-
ardous liquids such as chemical solutions discharged out of the pump directly onto
the ground. Instead, drain such liquids into some kind of container. Observe the
laws and regulations related to the application, handling, and processing of haz-
ardous substances.
•Do not pass under a raised pump.
Never pass under a raised pump. A serious injury could occur if the pump is acciden-
tally dropped.
•No remodeling!
Remodeling of the pump by the user may result in serious personal injury, electric
shock, or damage to the pump. Do not attempt remodeling as it is very dangerous.
•Cautions when dangerous liquids are transferred.
When the pumps are used to transfer the dangerous liquids mentioned as below, the
pumps always must be checked and watched so that the liquids can not be leaked.
The operation of the pumps leaking the liquids may result in personal injury and/or
explosion, fire accidents.
• Explosive, fire-spreading and inflammable liquids
• Corrosive and stimulus toxic liquids
• Liquids detrimental to health
CAUTION
•Qualified operators only!
The pump operator and pump operation supervisor must not allow any operators who
have little or no knowledge of the pump to run operate the pump. Pump operators
must have a sound knowledge of the pump and its operation.
•For specified application only
The pump is designed and manufactured to the specifications agreed upon by the
user and IWAKI. The use of a pump in any application other than those clearly speci-
fied may result in injury or damage to the pump. Use the pump strictly in accordance
with the pump specifications and application range. If you change any specification,
contact IWAKI or your dealer.
•Ventilate!
Poisoning may result during an operation which involves toxic or odorous liquid.
Ventilate the operating site sufficiently.
- 3 -
Prohibited
No Remodeling
Safety Section
Prohibited
Caution

CAUTION
•Spill-out prevention measures
Appropriate protective measures should be taken against any spill-out accidents
involving the operating liquid as a result of unexpected damage to the pump or the
piping. Never discharge hazardous liquid, including, but not limited to, chemical liq-
uid, over the ground or floor on the pump operating site. Follow local rules and regu-
lations in disposing of hazardous substances.
•Do not operate the pump dry.
Do not run the pump dry (without liquid inside the pump). Heat generated as a result
of abrasion between elements inside the pump during operation without liquid may
damage the inside of the pump. Operating the pump with the suction valve fully
closed will result in dry operation.
•Keep away from heat or flame.
Do not place any open flame or flammable object near the pump.
•Do not stand on the pump.
Do not stand on the pump or use the pump as a step under any circumstances.
Otherwise, you may experience a serious injury.
•Do not touch the pump.
When the pump is used to feed a hot liquid, do not touch the pump or the piping with
your bare hands during and immediately after operation as their surfaces are danger-
ously hot.
•Arrange grounding!
Do not operate the pump without connecting the grounding wire. Otherwise, an elec-
trical shock may result. Make sure the grounding wire is connected with the ground-
ing terminal.
•Install an earth leakage breaker
The operation of a pump without using an earth leakage breaker may cause an elec-
trical shock. Please install an optional leakage breaker in the system.
•Do not install or store the pump in the following places.
• Places where flammable gas, dust or material is used or placed.
• Places where corrosive gas (chlorine gas or the like) is generated.
• Places where the ambient temperature is extremely high (40 °C or higher) or
extremely low, 0 °C or lower.
• Places where the pump is exposed to extreme dust or humidity. (Excluding the out-
door type)
• Places where vibrations occur.
- 4 -
Caution
Grounding
Caution
Prohibited
Prohibited
Prohibited
Electrical
Shock
Safety Section
Prohibited

CAUTION
•Pump start-up
When connecting a power supply to the pump, make sure there is no person around
the pump. The pump has no ON/OFF switch. The pump starts operation when the
power is supplied by connecting the power supply cable.
•Foreign matter
Should foreign matter enter the pump, turn off the power at once and remove the
obstruction. Using the pump with foreign matter inside may cause damage to the
pump or a malfunction.
•Disposal of used pump
Disposal of used or damaged pumps must be done in accordance with local laws and
regulations. (Consult a licensed industrial waste products disposing company.)
•Handling of magnet coupling
The magnet used in the pump has a very high magnetic power. Be careful not to
allow your fingers to be seized by the magnet or to allow the magnet near any elec-
tronic device which may be affected by the magnet's power.
•Suspending pump operation for a prolonged period
When suspending pump operation for a prolonged period, drain the pump and clean
inside the pump. Take appropriate measures to prevent the entrance of foreign mat-
ter into the pump. If the pump is not operated for a period longer than one year,
replace the O ring and inspect inside the pump.
•Countermeasure for static electricity
When low electric conductivity liquid such as ultra-pure water and fluor inactive
liquid(e.g.FluorinertTM) are handled, the static electricity may be generated in pump,
which may cause static discharge and break down. Take countermeasure to avoid
and remove static electricity.
- 5 -
Caution
Caution
Safety Section

OUTLINE OF PRODUCT
1. Before Using Pump ........................... 7
2. Operating Principle ........................... 7
3. Identification Codes .......................... 8
4. Specifications and
Outer Dimensions ................... 9
5. Names of Parts ............................... 11
- 6 -

- 7 -
After unpacking, check the following points to confirm that
the delivered product and its accompanying parts and
elements are exactly what you ordered.
When lifting the pump please follow the procedure
mentioned "2. Installation" of "Pump operation".
[1] Do the model and frequency indicated on the nameplate
conform to your order?
[2] Prior to the installation of the MDF-LMKK pump
(using SiC liner ring and mouth ring), remove the
cardboard pad inserted inside the suction port.
[3] Has the pump unit or any part of it been damaged or
bolts and nuts been loosened during delivery?
[4] The fourth numeral of the MFG. No. shows the year the
product was manufactured.
(e.g.) ×××5×××
"5" shows the product was manufactured in the year
1995.
If you find anything wrong, please refer to the dealer you
placed your order with.
1. Before Using Pump
2. Operating Principle
The MDF-L pump is a magnet-driven centrifugal type
pump developed for various applications.
The impeller inside the pump chamber (front casing) is
rotated by magnetic force to transfer liquid from the suction
side to the discharge side.
The MDF-L type pump features excellent corrosion
resistance, durability, and safety, and serves as a chemical
pump for various processes. Most chemicals can be
handled by the pump.
Iwaki Magnet Pump
MODEL
HEAD (m)
CAPACITY (R/ min)
kW
5 0 Hz rpm
MFG.No.
IWAKI EUROPE GmbH
MADE IN JAPAN
MDF - L
Year:
2P406187
: Flow of liquid
: Direction of impeller rotation
Discharge side
Suction side
Impeller
Front casing

MDF-L Type Series
Shows discharge port diameter
(42 shows 40)
0: 0.37 kW 1: 0.75 kW 2: 1.5 kW 3: 2.2 kW
5: 4 kW 7: 5.5 kW 10: 7.5 kW 15: 11 kW
CF: High density carbon/Alumina ceramics 99.5%
AA: Alumina ceramics 99.5%/Alumina ceramics 99.5%
* SiC/SiC is used in the model 6515.
KK: SiC/SiC
V: FKM E: EPDM A: AFLAS®
FKM, AFLAS®: Fluoro rubber
EPDM: Ethylene propylene rubber
T, V, W: Standard
K, L: For high head applications
No mark: Standard
D, E: Pin-point contacting bearing system
(Standard models for 250, 401, 422, 423 and
425)
H, DH, EH:For up to 100 ˚C model (call it "H" type)
qSeries
wSize of pump:
eMotor output
rMaterial of bearing/spindle
tMaterial of O ring and gasket
yCode of impeller
uConstruction code
- 8 -
3. Identification Codes
Example:
MDF-L 42 5 CF V T - D
qwertyu

- 9 -
4. Specifications and Outer Dimensions
MMStandard specifications
25×25
MDF-L401
Port Diameter
Suction Port ×
Discharge Port
Standard Performance
m-R/ min.
Model Impeller
Code
Rated
speed
(min-1)
Motor
Output
kW
50Hz
K12.2 - 50
T7.3 - 150
V5.6 - 150
W3.0 - 150
K16.8 - 100
T4.5 - 200
V8.3 - 200
W4.8 - 200
K
T
V
W
K
L
T
V
W
T
V
W
T
V
W
K
T
V
W
T
V
W
K
T
V
W
T
V
W
40×40
50×40
50×40
50×40
65×50
80×65
MDF-L250
MDF-L422
MDF-L423
MDF-L505
MDF-L425
MDF-L507
MDF-L657
MDF-L6510
MDF-L6515
20 - 200
18 - 200
14 - 200
10.5 - 200
28.5 - 150
21.5 - 300
19.5 - 300
15 - 300
11.5 - 300
25.5 - 400
21 - 400
12 - 400
17 - 600
12.5 - 600
8.5 - 600
32.5 - 500
29 - 600
19.5 - 600
12.0 - 600
18.5 - 1000
10.5 - 1000
6.5 - 1000
30.5 - 800
26 - 1000
14.8 - 1000
9.5 - 1000
33 - 1000
24.8 - 1000
15 - 1000
2900
0.37
0.75
1.5
2.2
5.5
4
7.5
11
50Hz

ea
b
d
g
fH
j
hWi
L
k
Model
Mass (kg)
250 401 422 423 425 505 507 657 6510 6515
- 10 -
Model
MDF-L250
MDF-L401
MDF-L422
MDF-L423
MDF-L425
W
205
233
251
H
237
275
295
L e
143
250
275
d
95
111
106
c
51
58
65
b
150
170
180
a
110
130
140
k
4-ø12
4-ø14
j
25
40
50
i
25
40
h
88
102
87
g
122
140
f
115
135
155
Model
MDF-L505
MDF-L507
MDF-L657
MDF-L6510
MDF-L6515
W
298
H
340
360
410
L f
180
230
e
285
365
450
d
90
108.5
108
b
280
a
220
k
4-ø14
j
65
80
i
50
65
h
80
100
g
160
180
MMMass
MMOuter dimensions
e d
g
fH
j
h
L
b
a
c
Wi
k

- 11 -
5. Names of Parts
MMNames of Parts
• MDF-L250 and 401
No.
1
2
3
5
7
8
9
11
12
13
15
16
17
No.
18
19
20
21
22
23
24
25
26
Q'ty
1
1
1
1
1
1
2
1
1
1
2
Parts name Material
M8×65, WITH SW, Q'TY5
FERRITE MAGNET+ALUMINUM ALLOY
STNLS STL
FC200
CFRETFE
PTFE
CFRETFE
M8×35, WITH SW, Q'TY1 M8×70, WITH SW, Q'TY5
M8×40, WITH SW, Q'TY3
Model 250 Model 401
Remarks
Front casing
Rear casing
Impeller
Drive magnet unit
Hex. head bolt
Hex. head bolt
Foot support
Cover A
Cover C
Cover B
Magnet capsule
Motor
Cap
Q'ty
Parts name Remarks
Model 401Model 250
JIS B 2401
G 135
Only "H" type
Material KK-EAA-ECF-D
PTFE
V: FKM E: EPDM A: AFLAS
Steel
STNLS STL
High density
carbon
Alumina ceramics 99.5% SiC
®
1
1
1
1
1
1
2
1
1
Liner ring
Impeller thrust
Spindle
Bearing
Mouth ring
Oring
Gasket
Eye bolt
Rear casing cover
JIS B 2401
G 160
Only model 401
16 132
25
911
1
12
22
18
3
17
24
23
19
15
21520
26
87

• MDF-L422, 423 and 425
- 12 -
No.
1
2
3
5
7
8
9
11
12
13
15
No.
18
19
20
21
22
23
24
25
29
Q'ty
1
1
1
5
1
1
1
2
1
1
Parts name Material
M10×40 WITH SW
RARE EARTH MAGNET+FCD450
FC200
CFRETFE
CFRETFE
M10×75 WITH SW
Front casing
Rear casing
Impeller
Drive magnet unit
Hex. socket head bolt
Hex. socket head bolt
Foot support
Cover A
Cover C
Cover B
Magnet capsule
Motor
Cap
Q'ty
Parts name Remarks
JIS B 2401 G 165
Material KK-EAA-ECF-D
PTFE
V: FKM E: EPDM A: AFLAS
Steel
STNLS STL
High density
carbon
Alumina ceramics 99.5% SiC
®
1
1
1
1
1
1
2
1
1
Liner ring
Impeller thrust
Spindle
Bearing
Mouth ring
O ring
Gasket
Eye bolt
Retainer ring AS568-129
80 V, A: FKM E: EPDM
1
O ring
PTFE
16
17
1
1
2
STNLS STL
Remarks
80
29
87
20 5211519
16 925 213 11
1
12
22
23
24
17
3
18

- 13 -
• MDF-L505, 507, 657, 6510 and 6515
No.
1
2
3
5
7
8
9
11
12
13
15
No.
18
19
20
21
22
23
24
25
26
Q'ty
1
1
1
1
1
2
1
1
Parts name Material
M12×50, WITH SW, Q'TY 5
FERRITE+SS400
FC200
CFRETFE
CFRETFE
M12×90, WITH SW, Q'TY 1
Model 505 and 507 Remarks
Front casing
Rear casing
Impeller
Drive magnet unit
Hex. head bolt
Hex. head bolt
Foot support
Cover A
Cover C
Cover B
Magnet capsule
Motor
Cap
Q'ty
Parts name Remarks
JIS B 2401 G 230
Material KKAACF
Alumina ceramics 99.5%
PTFE
V: FKM E: EPDM A: AFLAS
Steel
STNLS STL
High density carbon SiC
®
1
1
1
1
1
1
2
1
1
Liner ring
Rear thrust ring
Spindle
Bearing
Mouth ring
O ring
Gasket
Eye bolt
Rear casing cover
PTFE
16
17
1
1
2
STNLS STL M12×50, WITH SW, Q'TY 5
M12×100, WITH SW, Q'TY 1
Model 657 and 6510 Model 6515
M12×90, WITH SW, Q'TY 6
*Note: In model 6515 AA, Spindle and Bearing made of SiC are used.
Model 505 has a rear casing cover only "H" type.
The larger models above model 507 have a rear casing cover as standard equipment.
In model 6515, Drive magnet made of rare earth magnet is used.
2026
16 9 5 25 2 13 8
7
19 21 15 23
24
17
3
11
1
12
22
18

MMDescription on Main Unit Body and Label
- 14 -
Pump unit (liquid feeding section)
Non-self priming type: Before operating the
pump, feed priming
liquid through the
suction or dischargeside
port.
Motor nameplate
Use only the power voltage specified on the
nameplate. (Follow applicable local power
regulations when used outside of Japan.)
"Arrow" indicator label
The arrow indicates the rotating
direction of the motor.
Always make sure that the motor
runs in the direction the arrow
indicates. (Refer to Preparation
for start-up [6] in the Pump
operation chapter.)
Motor (Driving section)
This motor provides power to the
pump unit.
Base
Setting should be fixed.
Discharge port
Suction port
Drain port
Liquid discharge port
Drain the discharged liquid into a
suitable container and follow the
applicable local regulations in
disposing of the liquid. Never
allow the discharged liquid to run
directly onto the ground.
"Never Operate Dry" indicator label
Operating the pump without liquid will
cause damage inside the pump. Never
operate the pump without liquid.
CAUTION
When cleaning the pump, be careful not to wipe the labels or the pump body
with solvent.
Specifications nameplate
Pump must be operated only under
the specified conditions.

PUMP OPERATION
1. Handling Instructions ...................... 16
2. Installation ....................................... 21
3. Piping .............................................. 22
4. Wiring .............................................. 26
5. Operation Step ............................... 27
- 15 -

[1] Handle the pump carefully.
Strong impacts caused by dropping the pump on the floor or striking it may result in damage or faulty
performance.
[2] Priming water
Be sure to fill the pump unit with feeding liquid as priming water before pump operation.
[3] Do not operate the pump in the following places.
• Places where the temperature falls below 0 ˚C
• Places where corrosive gas or explosive gas is generated
• Places exposed to splashing water
• Places where the ambient temperature is 40 ˚C or above
• Places where the humidity is excessively high. (Permissible humidity: 35~85%RH)
• Places filled with or likely to be filled with explosive or corrosive atmosphere.
• Danger due to dust, fire, earthquake and/or any externally imposed shock.
[4] Keep the pump away from fire.
To prevent fire and explosions, do not place dangerous or inflammable substances near the pump.
[5] If pump is damaged
Do not operate a damaged pump, otherwise there may be electricity leakage or electric shocks.
(Observe all the following instructions
to prevent injuries and accidents.)
- 16 -
1. Handling Instructions
Caution
¡Read the following information prior to installing the pump.
¡Protective wear:
When operating the pump or working near it, with the pump system loaded with chemical liquid,
always wear protective clothing, face guard, goggles, and gloves. Further precautionary
measures must be taken depending upon the type of liquid used.
¡Operating the pump dry (without supplying liquid to it) may cause seizure on wear of the
inside of the pump section.
¡Do not repair the pump beyond the range specified in this instruction manual.
The pump must be repaired by trained and qualified operators only.

[6] No remodeling
Never try to remodel the pump. This may cause a serious accident or damage.
[7] Limitation to disassembly or repair
Users are allowed to disassemble and repair the pump to the degree of the given description in "Disassembly
and Assembly" in this manual.
[8] No dry running operation
Dry operation of the pump (pump operation without liquid inside) may cause damage to the pump internally.
Never operate the pump dry. In the case of MDF-L type, the sliding parts are self-lubricated and self-cooled. If
the pump is operated dry or with the suction-side valve closed, damage may result.
* Countermeasures to be taken in case of dry operation
1. Turn off the power switch of the pump immediately and leave the pump as it is for more than 1 hour.
2. Prime the pump and fill the pump with liquid.
(Note that the pump should be supplied with liquid after leaving the pump empty for more than 1 hour.
Sudden supply of liquid may cause a crack in a part due to quenching effects.)
[9] Dry operation compatible type pump
The dry running operation compatible type pump (with D at the end of the model identification) can endure
continuous dry running operation of not longer than 1 hour. Longer dry running operations, if repeated
frequently, may result in wear of the sliding parts which rapidly affects the normal functioning of the inner part
of the pump. The pump is designed so as not to develop cracks as a result of sudden cooling down with liquid
immediately after dry operation. However, it is recommended that the pump be left as it is for about 20 minutes
before running it with liquid.
* Pumps with E at the end of the model identification or without any symbol cannot endure dry running
operation.
[10] Points to be noted when starting and stopping pump
Pay close attention to the following points to avoid water hammer action when starting and stopping pump
operation. When the discharge-side piping is very long, extra attention is required.
(1) When starting the pump, first prime it. Then, close the discharge valve completely and turn on the power
switch. After starting up the pump, open the discharge valve gradually and set it to the desired operation
level.
(2) When stopping the pump, first close the discharge valve slowly. Turn off the power switch only after
completely closing the discharge valve.
In this procedure, never try to stop the pump quickly using a solenoid
valve, etc. Quick closure may cause water hammer action, and the
excessive pressure will destroy the pump.
- 17 -
Caution

505 "H" type
507/657/6510 Standard
[11] Allowable pressure limit
See the table 1~5 for allowable pressure limits of each model.
See that the discharge pressure does not exceed the allowable pressure limit.
- 18 -
425 Standard
"H" type
MDF-L250
Standard
0.3
0.16
MPa
0 ˚C 90 100
Temperature
MDF-L422/423/425
0.45
0.4
MPa
0 ˚C 100
Temperature
422/423
Standard
"H" type
MDF-L401
Standard
0.3
0.24
MPa
0 ˚C 90 100
Temperature
MDF-L505/507/657/6510
0.5
0.4
0.3
MPa
0 ˚C 70 90 100
Temperature
Table 1
Table 4Table 3
Table 2
NOTE
MDF-L6515
0.6
0.5
MPa
0 ˚C 70 100
Temperature
Standard
Table 5
NOTE
*AFLAS®O ring
Above 10 ˚C
505 Standard