VERDER JEC JRZW Series User manual

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Operation and maintenance manual
JEC_ZW_man rev01-2019_(uk)
JEC HYGIENIC PUMP SOLUTIONS
JEC JRZW SERIES
Hygienic wine processing pump

2
Contents
Thank you for purchasing a JEC Products!
This manual contains installation, operation, disassembly and assembly instructions,
maintenance procedures, troubleshooting and a complete parts list for all JP series
Centrifugal Pumps designed and manufactured by JEC Ltd. South Korea.
READ THIS MANUAL carefully to learn how to service these pumps. Failure to do so could
result in person injury or equipment damage.
Certificates
3-A (3-A Sanitary Standards, Inc.)--------------------------------------------------------------
ATEX (European Explosion proof certification)------------------------------------------------
1935/2004 (EC)------------------------------------------------------------------------------------
CE(Declaration of conformity)-------------------------------------------------------------------
SAFETY
DO’S and DON’TS ---------------------------------------------------------------------------------
INSTALLATION
Installation -----------------------------------------------------------------------------------------
Start Up --------------------------------------------------------------------------------------------
TROUBLESHOOTING
Troubleshooting ----------------------------------------------------------------------------------
MAINTENANCE
Disassembly ---------------------------------------------------------------------------------------
Inspection -----------------------------------------------------------------------------------------
Seal assembly -------------------------------------------------------------------------------------
Pump housing assembly--------------------------------------------------------------------------
Rotor clearance------------------------------------------------------------------------------------
Rotor Timing---------------------------------------------------------------------------------------
Shaft and bearing replacement------------------------------------------------------------------
TECHNICAL INFORMATION
Technical Data ------------------------------------------------------------------------------------
Dimensional Drawing -----------------------------------------------------------------------------
PARTS LIST
Exploded View -------------------------------------------------------------------------------------
Single & Double mechanical seal----------------------------------------------------------------
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SAFETY
DO’S & DON’TS
DO read and understand these instructions before installing or using the pump.
DO use JEC spare parts when replacing a component of the pump.
DO NOT service the pump while it is running.
DO NOT place the pump in an application where the service ratings are exceed.
DO NOT modify the pump. Modifying the pump creates unsafe conditions and voids all
warranties.
SAFETY PRECAUTIONS WHEN INSTALLING PUMP
DO use an authorized electrician when connecting the pump.
DO observe the mechanical limits of the pump (refer to the pump performance sheet).
DO install a throttling valve in the discharge line.
DO NOT install a throttling valve in the suction line.
SAFETY PRECAUTIONS WHEN OPERATING PUMP
Do only qualified personnel should operate this pump.
DO NOT start the pump until all personnel are clear.
DO NOT touch the pump or the lines when pumping hot fluids or when performing Clean In
Place (CIP) procedures.
DO NOT run the pump with BOTH the suction inlet and discharge outlet blocked. Running
the pump with the inlet the blocked will cause serious damage to the pump.
DO NOT check pump rotation with liquid in the pump.
DO NOT run the pump with the front cover removed. The rotors and rotor case could be
damaged or may cause severe injury.
DO NOT operate the pump with removed the safety guard or shroud.
SAFATY PRECAUTIONS WHEN SERVICING PUMP
DO ensure the pump is cool to touch before performing service.
DO relieve all pressure and drain all fluids from pump and connected piping before
performing service.
DO ENSURE POWER TO THE UNIT HAS BEEN UNPLUGGED PRIOR TO
PERFORMING ANY PUMP MAINTENANCE OR CLEANING.
DO exercise caution and wear protective clothing when using lye or acid for cleaning.

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INSTALLATION
INSTALLATION
1. Mounting surface should be flat and level.
2. The suction line should be kept as short as possible and present minimum friction
loss.
3. Suction and discharge lines must be fully supported and installed so that no
expansion or shock forces act on the pump which could lead to distortion.
4. Ensure sufficient clearance around the motor and pump.
START UP
1. Before connecting the suction and discharge pipe work the entire system must be
thoroughly cleaned to prevent damage from welding, grinding and other residues.
2. Before starting, bump the motor to check if the motor fan is rotating clockwise when
seen from the motor back. If the motor fan cannot be seen, look through the pump
case adaptor after takeoff motor shroud. (Bump means to momentarily apply power
to the motor and then immediately remove power).
3. Direction of rotation must only be checked with a completely filed system. Where
double mechanical shaft seals are installed the flush supply must be operational. Any
dry running will result in seal damage.
4. The motor rating plate should be checked to ensure that it is in accordance with the
available electrical supply. It is essential that the full load current is not exceeded to
prevent motor overload.
5. Before start up any safety guards required by local statutory regulations should be
fitted.
Pay attention to circumstances that could indicate pump cavitation;
1. Low pressure in the suction line due to bad suction conditions.
2. Air in the suction inlet line.
3. Pumping temperature is too high.
4. Pump is oversized.

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TROUBLESHOOTING
Problem
Cause
Solution
Pump not turning
Interruption of electrical power
Key sheared or missing.
Coupler or belts are not connected.
Pump shaft or gears sheared.
Wrong rotation.
Relief valve not properly adjusted.
Reset circuit breaker, check
fuses.
Replace.
Replace or adjust.
Replace.
Reverse.
Adjust valve.
Pump not priming
Valve closed in suction lines.
Suction line clogged or restricted.
Air leak in connections or seal.
Pump speed too slow.
Suction line does not remain flooded.
Air lock.
Excessive clearances in pump.
Net inlet pressure low.
Open valve.
Clear suction line.
Repair leak.
Increase sped.
Install foot valve.
Bleed suction line.
Replace out of tolerance parts
Increase suction pressure
Insufficient flow
Speed too low.
Air leak.
Adjust speed as required.
Repair leak.
Noisy operation
Cavitation
Viscous product.
High vapor pressure, high temp.
Leaks in piping or pump.
Dissolved gas in product.
Mechanical noise.
Excessive weight from piping,
Pump body distorted.
Excessive discharge pressure.
Worn bearing.
Worn gears.
Rotor-to-rotor contact.
Increase net inlet pressure.
Slow pump, reduce product.
Reduce temperature.
Repair leaks.
Reduce discharge pressure.
Check tolerances.
Support piping.
Check align and level
Reduce discharge pressure.
Replace bearing.
Replace gears
Time rotors, replace twisted
shafts, replace worn gears.
Pump overloads
Viscosity and pressure of
product higher than expected.
Rotor contact to housing or cover
Reduce pump speed, increase
piping size,
Adjust clearance
Play between gears
Worn gear teeth.
Gear loose on shaft.
Replace gear.
Inspect gear key, keyway and
shaft. If all are undamaged,
retighten the gear retaining nut.
Check for backlash.
If assistance is required, please contact your local sales office with the following information:
1. Operating conditions.
2. Accurate description of default.
3. Model of pump and serial number.
4. If possible installations sketch of pump system.

10
MAINTENANCE
PUMP HOUSING DISASSEMBLY
Prior to removal of pump, the shut-off valves in the suction and discharge pipe work must be
closed. If there is any risk that product many harden, crystallize or freeze in the pump it
should be thoroughly drained and cleaned immediately after use. Similar attention must
apply to the seal flush system. Remove power before servicing to prevent unintended start of
the pump by an authorized electrician.
Loosen and remove the four wrench bolts from
the cover. Remove the cover. If it is stuck, tap on
the cover with a soft hammer.
Remove rotor-retaining bolts. Use a wrench. To
remove rotor-retaining bolts, place the plastic dowel
between the rotors as shown in Figure 2. Turn the
first rotor bolt counter- clockwise. Remove the rotor
bolts and spring washers
The rotors can be removed from the pump housing by
pulling straight together with top and bottom. If it is
stuck tight, alternately tap on the back of the inlet and
outlet ports with soft hammer. Handle the rotors with
care to avoid damage.