Frick LaZerWeld II User manual

This manual contains installation, operation, and maintenance
instructions. Read thoroughly before beginning installation. Failure
to follow these instructions may result in personal injury or death,
damage to the unit, or incorrect operation.
LaZerWeld II Plate Heat Exchangers
LZWII-2M, LZWII-4B, LZWII-4E, LZWII-6B,
LZWII-8K, LZWII-8B, and LZWII-12M
Check www.FrickCold.com for the latest version of this publication.
Form 190.210-IOM (SEP 2021)
Installation – Operation – Maintenance
File: Service Manual – Section 190
Replaces: 190.210-IOM (FEB 2020)
Distribution: 3, 3a, 3b, 3c

190.210-IOM (SEP 21)
Page 2
LazerWeld II Plate Heat Exchanger
Installation - Operation - Maintenance
Indicates an imminently hazardous situation that, if not avoided, results in death or serious
injury.
Indicates a potentially hazardous situation or practice that, if not avoided, results in death or
serious injury.
Safety precaution denitions
Indicates a potentially hazardous situation or practice that, if not avoided, results in damage to
equipment and/or minor injury.
Indicates an operating procedure, practice, etc., or portion thereof that is essential to highlight.
WARNING
CAUTION
DANGER
NOTICE
Table of Contents
General Information
Preface..............................................................................3
Safety considerations........................................................3
Warranty conditions.......................................................... 3
Advice...............................................................................3
Environmental compliance ................................................ 3
Unpacking.....................................................................3
Maintenance................................................................. 3
Scrapping .....................................................................3
Main components.............................................................. 4
Nameplate.........................................................................5
Function ............................................................................5
Identifying the plate side................................................... 6
Installation
Before installing ................................................................ 7
Requirements.................................................................... 7
Space ...........................................................................7
Foundation ...................................................................7
Elbow ...........................................................................7
Shut-off valve...............................................................7
Connections in the pressure plate ................................7
Drip tray (optional) ....................................................... 7
Lifting ...............................................................................7
Raising .............................................................................8
Connecting to the system .................................................9
Operation
Starting the unit ..............................................................11
Operating the unit........................................................... 12
Shutting down the unit.................................................... 12
Maintenance
Preventive maintenance guidelines ................................. 13
Monitor the status of your gaskets............................. 13
Design innovations .....................................................13
Fouling and cleaning................................................... 13
Audit schedule ...............................................................13
Backflushing ...................................................................14
Cleaning-in-place ...........................................................14
Reconditioning at an authorized center .......................... 14
Manual cleaning .............................................................. 14
Opening......................................................................14
Manually cleaning opened units .................................16
Deposits removable with water and brush ................. 16
Deposits not removable with water and brush ..........17
Regasketing .................................................................... 17
Clip-on and clip-grip ..................................................17
Adhesive tape............................................................. 18
Glued gaskets............................................................. 18
Closing ............................................................................18
Maximum tightening torque .......................................20
Pressure testing after maintenance.................................20
Storing the LZWII ............................................................ 20
Storage in packing box...............................................20
Taken out of service...................................................21
Installing after long-term storage...............................21

190.210-IOM (SEP 21)
Page 3
LazerWeld II Plate Heat Exchanger
Installation - Operation - Maintenance
General Information
Preface
This manual provides information necessary to install,
operate, and carry out maintenance of the Frick®
LaZerWeld II (LZWII) plate heat exchanger (PHE).
Safety considerations
Use and maintain the LZWII in accordance with Frick
instructions in this manual. Faulty handling of the heat
exchanger may result in serious consequences with inju-
ries to persons or property damage. Frick does not accept
responsibility for any damage or injury resulting from not
following the instructions in this manual.
Use the heat exchanger in accordance with the specied
conguration of material, media types, temperatures, and
pressure for the specic LZWII.
The following models are covered in this manual:
• LZWII-2M
• LZWII-4B
• LZWII-4E
• LZWII-6B
• LZWII-8K
• LZWII-8B
• LZWII-12M
Warranty conditions
The warranty conditions are usually included in the signed
sales contract before the order of the delivered LZWII.
Alternatively, the warranty conditions are included in
the sales offer documentation or with a reference to the
document specifying the valid conditions. If faults occur
during the specied warranty period, always consult your
local Frick Representative for advice.
Report the date when the heat exchanger was put into
operation to the local Frick Representative.
Advice
Consult your local Frick representative for information on
the following:
• New plate pack dimensions if you intend to change the
number of cassettes (twin plates)
• Selection of gasket material if operating temperatures
and pressures are permanently changed, or if another
medium is to be processed in the LZWII
Environmental compliance
Frick endeavours to perform its own operations as cleanly
and efciently as possible, and to take environmental
aspects into consideration when developing, designing,
manufacturing, servicing, and marketing its products.
Unpacking
Packing material consists of wood, plastics, cardboard
boxes and, in some cases, metal straps.
• Wood and cardboard boxes can be reused, recycled, or
used for energy recovery.
• Ensure plastics are recycled or burnt at a licensed
waste incineration plant.
• Send metal straps for material recycling.
Maintenance
• Send all metal parts for material recycling.
• Oil and all non-metal wear parts must be taken care of
in agreement with local regulations.
Scrapping
At end of use, recycle the equipment in accordance with
the relevant, local regulations. Besides the equipment
itself, any hazardous residues from the process liquid must
be considered and dealt with in the correct manner. When
in doubt, or in absence of local regulations, contact the
local Frick sales company.

190.210-IOM (SEP 21)
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LazerWeld II Plate Heat Exchanger
Installation - Operation - Maintenance
Table 1: LZWII main components
Bolt protection Plastic tubes that protect the threads of the tightening bolts.
Carrying bar Carries the plate pack and the pressure plate.
Frame plate Fixed steel plate with a number of port holes for the connection of the piping system. The carrying
and guiding bars are supported by the frame plate.
Guiding bar Keeps the channel plates and the pressure plate in line at their lower end.
Plate pack Heat is transferred from one medium to the other through the plates. The plate pack consists of
semi-welded plates in pairs that form a cassette (twin plate), gaskets, and distance sheets. The mea-
sure of the plate pack is the measurement between the frame plate and pressure plate. Refer to the
submittal drawing for this dimension.
Port holes with stud
bolt connections
Port holes through the frame plate allow the media to enter into or exit from the heat exchanger.
Different types of connections can be used to connect the piping system to the apparatus. Threaded
stud bolts around the port holes secure the connections to the apparatus. The port holes may be
protected against corrosion by metal linings. The LZWII can be equipped with different connection
types. For details, refer to LZWII drawings supplied with product.
Flanged pipe
connection
Illustration of connection type used for LZWII-4B.
Pressure plate Moveable steel plate that can contain a number of port holes for the connection of the piping system.
Covers Used as blind ange or inspection cover at the LZWII port holes.
Supporting column Supports carrying and guiding bars.
Tightening bolts Compress the plate pack between the frame and pressure plate.
Figure 1: LZWII main components
Port hole with stud
bolt connections
Tightening bolts
Frame plate
Distance sheets
Carrying bar
Bolt protection
Supporting column
Pressure plate
Guiding bar
Plate pack
Partition plate
Flanged pipe connection
Main components
The following gure and table details the main
components of the LZWII.

190.210-IOM (SEP 21)
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LazerWeld II Plate Heat Exchanger
Installation - Operation - Maintenance
Nameplate
On the nameplate you can nd the type of unit, manufac-
turing number, and manufacturing year. You can also nd
pressure vessel details in accordance with the applicable
pressure vessel code. The nameplate is most commonly
xed to the frame plate, or the pressure plate.
WARNING
For each unit, the mechanical design pressures and
temperatures are marked on the nameplate. These
must not be exceeded.
The mechanical design pressure and the design tem-
perature as given on the name plate are the values to
which the PHE is approved to the pressure vessel code in
question. The mechanical design temperature may exceed
the maximum operating temperature established for the
gasket material lifetime. If the operating temperatures as
specied on the assembly drawing are to be exceeded,
consult the supplier.
Figure 2: Nameplate
Material No.
FRICK Sales Order No.
Tag No. (Optional)
FOR PARTS, SERVICE AND AFTER MARKET ASSISTANCE
CALL 1-717-762-2121 | www.frickcold.com
Function
The LZWII consists of a set of corrugated metal plates
with port holes for inow and outow of two separate
uids. The plates are arranged as cassettes (twin plates) in
such a way that every second channel is welded, and ev-
ery other channel is gasketed. The heat transfer between
the two uids takes place through the plates. The cas-
sette concept gives rise to two different types of chan-
nel - welded channels used for the aggressive primary
media and gasketed channels used for the non-aggressive
secondary media.
The plate pack is assembled between a frame plate and
a pressure plate and compressed by tightening bolts. The
plates are tted with a gasket that seals the channel and
directs the uids into alternate channels. The plate cor-
rugation promotes uid turbulence and supports the plates
against differential pressure.

190.210-IOM (SEP 21)
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LazerWeld II Plate Heat Exchanger
Installation - Operation - Maintenance
Figure 3: Cassette arrangement forming the plate pack
Identifying the plate side
The A orientation of the cassette is identied by the stamp
with the letter A or the model name, in some cases both,
at the top of the plate. See Figure 4. The separate ring
gaskets always point to the right when the cassette is
oriented as A.
Figure 4: Plate side identication
End cassette II
End single plate
Channel cassettes
End cassette I
End single plate
Gasketed channel
created between
two cassettes
(blue)
Two plates that form
the welded channel
inside the cassette
(red)
Identication stamp Ring gasket

190.210-IOM (SEP 21)
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LazerWeld II Plate Heat Exchanger
Installation
Installation
Before installing
NOTICE
Before start-up, check that all tightening bolts are
rmly tightened and that you use the correct mea-
surements of the plate pack. See LWZWII drawing
and Closing section.
• To avoid water hammer, do not use fast-closing valves.
• Install safety valves according to current pressure ves-
sel regulations.
• If the LZWII surface temperature is expected to be hot
or cold, insulate the heat exchanger.
• Use protective sheets to cover the plate pack.
• For each model, design pressures and temperatures are
marked on the identication plate. These must not be
exceeded.
• Full vacuum conditions apply at start up for refrig-
eration duties to avoid moisture and air in the heat
exchanger.
Requirements
Space
A minimum free space is needed for lifting cassettes in
and out. Refer to the delivered drawing.
Foundation
Install on a at foundation giving enough support to the
frame.
Elbow
To allow easier disconnection of the LZWII, connect an el-
bow to the pressure plate using a ange, directed upwards
or sideways, and with another ange located just outside
the contour of the heat exchanger.
Shut-off valve
In order to open the LZWII, install shut-off valves at all
connections.
Connections in the pressure plate
Ensure the plate pack is tightened to the correct dimen-
sion A before connecting the pipe system. Verify on the
nameplate.
Drip tray (optional)
Depending on the type of uid in the LZWII and the type of
installation, a drip tray (drainage box) may be necessary to
avoid injury to personnel and damage to equipment.
Note: Put the drip tray in place before positioning the LZWII
Figure 5: Shut-off valve and elbow location
Lifting
Use straps when lifting the LZWII. Attach the straps as
illustrated in Figure 6 with a minimum angle of 45°.
Position straps as illustrated in Figure 7 to Figure 10.
Figure 6: Lifting straps
WARNING
Never lift by the connectors or studs.
Shut-off valve
Elbow

190.210-IOM (SEP 21)
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LazerWeld II Plate Heat Exchanger
Installation
Figure 7: Lifting device for LZWII-2M and LZWII-4B
Figure 8: Lifting device for LZWII-6B
Figure 9: Lifting device for LZWII-8K and LZWII-8B
Figure 10: Lifting device for LZWII-12M
Raising
This instruction is valid when raising the LZWII after
delivery. The strap is approved for the weight of the heat
exchanger to be used.
CAUTION
The straps are long enough to rotate the PHE without
obstructions. Pay particular attention to the space
required for the support column.
1. Place two timber posts on the oor.
Figure 11: Timber posts
2. Lift the LZWII off the pallet using straps.
Figure 12: LZWII on pallet

190.210-IOM (SEP 21)
Page 9
LazerWeld II Plate Heat Exchanger
Installation
3. Position the LZWII on the timber posts.
Figure 13: LZWII on timber posts
4. Place straps around one bolt on each side.
Figure 14: Straps
5. Lift the LZWII off the timber posts.
Figure 15: Lifting LZWII with straps
6. Lower the LZWII onto the oor in a horizontal position.
Figure 16: LZWII, horizontal
Connecting to the system
Before connecting any piping, complete the following:
• Ensure that no foreign objects have been left in the
system that connects to the LZWII.
• Remove the sealing blind covers from the port holes.
When connecting the piping system, complete the follow-
ing steps:
1. Ensure the pipes do not subject the LZWII to stress or
strain.
2. Install a strainer or lter with 0.5 mm to 1.0 mm mesh
size to prevent problems with foreign objects in the
piping system.
NOTICE
Frick suggests installing an external secondary media
inlet strainer with a mesh size of between 0.5 mm to
1.0 mm.

190.210-IOM (SEP 21)
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LazerWeld II Plate Heat Exchanger
Installation
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190.210-IOM (SEP 21)
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LazerWeld II Plate Heat Exchanger
Operation
Operation
Starting the unit
During start-up, check that no visible leakages appear
from the plate pack, valves, or piping system.
NOTICE
If several pumps are included in the system, ensure
you know which one to activate rst.
NOTICE
Make adjustments of ow rates slowly in order to
avoid the risk of pressure surge (water hammer).
Water hammer is a short-lasting pressure peak that
can appear during start-up, or shut-down of a sys-
tem, causing liquids to travel along a pipe as a wave
at the speed of sound. This can cause considerable
damage to the equipment.
NOTICE
Charging liquid ammonia into a refrigeration circuit
under vacuum results in low temperatures. Such
temperature levels might be lower than any elasto-
meric materials can seal against.
In applications where the eld side is used for a two-
phase refrigerant, for example cascade CO2/NH3ap-
plications, it is very important to ll the two-phase
refrigerant in gas phase. This to avoid temperature
chocks for the gaskets and to avoid temporary leak-
ages due to the natural fact that the metal is shrink-
ing very fast.
1. Before start-up, check that all tightening bolts are
rmly tightened and that the dimension A is correct.
See the following gure.
Figure 17: LZWII, dimension A
2. Check that the valve is closed between the pump and
the unit controlling the system ow rate.
Figure 18: Valve positions
3. If there is a valve at the exit, make sure it is fully open.
4. Open the air vent and start the pump.
Figure 19: Open the air vent
5. Open the valve slowly.
Figure 20: Open the valve to pump
Valve
Open
Closed
Open

190.210-IOM (SEP 21)
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LazerWeld II Plate Heat Exchanger
Operation
NOTICE
Avoid rapid temperature changes in the LZWII. With
media temperatures over 212°F (100°C), slowly in-
crease the temperature, preferably at least for 1 h.
6. When all air is expelled, close the air vent.
Figure 21: Close the air vent
7. Repeat Steps 1 to 6 for the second media.
Operating the unit
Make adjustments of ow rates slowly in order to protect
the system against sudden and extreme variations of tem-
perature and pressure.
During operation, check that media temperatures and
pressures are within the limits stated on the LZWII drawing
and identication plate.
Shutting down the unit
If several pumps are included in the system, make sure
you know which one to stop rst.
1. Slowly close the valve controlling the ow rate of the
pump you are about to stop.
Figure 22: Close the valve to pump
2. After closing the valve, stop the pump.
3. Repeat Steps 1 to 2 for the other side for the second
media.
4. If the LZWII is shut down for several days or longer,
drain it. Also drain if the process is shut down and the
ambient temperature is below the freezing temperature
of the media. Depending on the media processed, rinse
and dry the heat exchanger cassettes and connections.
Figure 23: Draining the unit
Closed
Closed

190.210-IOM (SEP 21)
Page 13
LazerWeld II Plate Heat Exchanger
Maintenance
Maintenance
The following maintenance schedule provides a general
guideline for servicing the LZW II semi-welded plate heat
exchanger (SWPHE).
Preventive maintenance guidelines
Monitor the status of your gaskets
Monitoring the gasket condition at appropriate intervals is
important because gasket lifetime can vary under different
operating conditions. In many installations, SWPHE may
operate for 10+ years without experiencing leaks. Due to
constant innovation of gasket material and mechanical de-
sign of the plates, it is possible to extend gasket replace-
ment schedules compared to older plate heat exchangers.
Design innovations
Frick RefTight™ plate innovation is a unique, reliable,
and robust sealing system that contributes to the long-
life expectancy of gaskets in refrigeration applications.
The formed ring gasket groove offers full support of the
ring gasket sealing at high pressures and temperatures.
The groove is formed in the pressed plate and positioned
separate from any lazer weld, ensuring optimal sealing of
the ring gasket.
Fouling and cleaning
Depending on the nature of the transfer uids and the ap-
plication, the PHE performance may decline over a period
of time due to fouling. This deterioration in performance is
usually due to the buildup of scale, sediment, or biological
debris on the plates. In refrigerant applications, the main
risk for fouling is on the coolant side, especially if it has
open systems like cooling towers or river water. Closed-
loop coolant systems have less risk of fouling.
There are three general methods to removing fouling:
• Backush the heat exchanger
• Cleaning in place (CIP) by circulation of CIP uid with-
out dismantling the SWPHE
• Mechanical or chemical cleaning by dismantling the
SWPHE
Fouling deteriorates the thermal performance of the
SWPHE. The evaporation temperature decreases and the
condensation temperature increases from startup condi-
tions.
2°F in higher temperature difference (ΔT) between evapo-
ration/condensation and coolant increases the required
energy input to the compressor by approximately 3%.
For example, by cleaning a fouled SWPHE and reducing
the ΔT by 2°F, the energy savings come to 45,000 kWh/
year with a 400 HP motor running 5,000 h/year. With a
cost per kWh of $0.10 the annual savings come to $4,500.
Figure 24: Gasket
Audit schedule
Perform a basic audit on an annual basis to ensure the unit
is operating in a safe and effective manner. Include the
following checks in the audit:
• Check both media pressures on the inlet and the outlet
and record the pressure drops.
• Check for any refrigerant leaks.
• Check the perimeter of the plate pack for refrigerant
permeation levels and note any areas of high perme-
ation or concern.
• Clean the PHE inside or outside as necessary.
On a bi-annual basis, expand the audit to include the fol-
lowing checks:
• Visually inspect the exterior edges of exposed installed
gaskets for degradation or indications of leakage.
• Verify and record the pressure drops through both
chambers of the heat exchanger. Ensure they are within
original operating parameters.
• Verify and record the media temperatures on the inlet
and outlet of both chambers of the heat exchanger. En-
sure they are within the original operating parameters.
• Using the above data, verify the media ow and energy
exchange are within the original design.
• Review the tightening bolts, frame plate, pressure plate,
and overall construction. Check that the A dimension is
within 1% of the nameplate dimension shown.
• Visually inspect that the frame plate, pressure plate
(follower), stud bolts, pipe stubs, tightening bolts, car-
rying bar, guide bar, and fasteners are free of rust and
pitting. Clean as necessary.
At a minimum, dismantle the heat exchanger every 8 years
to 10 years and replace all the port rings and boundary
gaskets.
NOTICE
Audit guidelines adopted by the facility must follow
ANSI/IIAR 6-2019 Standard for Inspection, Test-
ing, and Maintenance of Closed-Circuit Refrigerant
Systems.

190.210-IOM (SEP 21)
Page 14
LazerWeld II Plate Heat Exchanger
Maintenance
To keep the LZWII in good condition, clean the plates, or
cassettes, on a regular basis. The frequency depends on
several factors such as the type of media and tempera-
tures. The style of cleaning required is dependent on the
type and severity of contamination
You can use four methods for cleaning.
• Backush the heat exchanger.
• Cleaning in place by circulation of CIP uid without
dismantling the SWPHE.
• Dismantle the SWPHE onsite and have the plates re-
conditioning at an authorized service center.
• Mechanical or chemical cleaning by dismantling the
SWPHE onsite.
Backflushing
Backflushing is the reversal of flow for a short period of
time. It flushes out matter that accumulates at the PHE
inlet. Backflushing can be designed for a manual process
or an automatic process.
A standard automatic backush design is often set to do
this three times a day for 30 s. By automatically remov-
ing this loose debris on a daily basis, the backush valve
contributes to many years of trouble-free service.
Figure 25: Backushing
Cleaning-in-place
The CIP equipment permits cleaning of the PHE without
opening it. Benets of CIP include:
• Removal of fouling and lime scale deposits.
• Passivation of cleaned surfaces to reduce susceptibility
to corrosion.
• Neutralization of cleaning liquids before draining.
NOTICE
If cleaning in place, use modulating or soft pumps to
avoid high ow rates and pressure shocks.
WARNING
Use appropriate protective equipment, such as safety
boots, safety gloves and eye protection, when using
the cleaning agents.
WARNING
Corrosive cleaning liquids can cause serious injuries
to skin and eyes!
See the specifc CIP equipment instructions for cleaning
procedures.
Frick guarantees that plates (cassettes), gaskets, and ad-
hesive cannot be damaged if the procedures and cleaning
agents specied are used.
If CIP is inappropriate, cleaning must be done manually.
See Manual cleaning.
Reconditioning at an authorized
center
Sometimes it is necessary to send the plate pack out for
reconditioning. The factory authorized facility can clean
the plates or plate pairs and inspect for leaks. This process
still requires disassembling the heat exchanger on site
and then regasketing and reassembly after the refurbished
plates are received back.
The opening and closing procedures are identical for both
manual cleaning on site or reconditioning the plates by a
service center.
Contact your local Frick Industrial Refrigeration sales ofce
to find an appropriate authorized service centers.
Manual cleaning
To perform manual cleaning it is necessary to open the
LZWII and lift out the cassettes to clean them. Only every
second channel is gasketed, accessible, and feasible to
clean.
Note: For manual cleaning of heat exchangers in refrigerant
services, contact your Frick representative.
Opening
NOTICE
Before opening the PHE check the warranty condi-
tions. If in any doubt, contact a Frick sales represen-
tative. See Warranty conditions.
WARNING
If the PHE is hot, wait until it has cooled down to
about 104°F (40°C).
WARNING
If necessary, use appropriate protective equipment,
such as safety boots, safety gloves and eye protec-
tion, depending on type of media in the PHE.

190.210-IOM (SEP 21)
Page 15
LazerWeld II Plate Heat Exchanger
Maintenance
1. Drain the LZWII.
Figure 26: Drain the LZWII
2. Brush the threads of the bolts clean, using a steel wire
brush or the Frick thread cleaner. Lubricate the threads
with a thin layer of grease, such as Gleitmo 800 Lubri-
plate or equivalent.
Figure 27: Brush the threads
3. Inspect the sliding surfaces of the carrying bar and
clean and grease it.
Figure 28: Inspect the carrying bars
4. Mark the cassette assembly on the outside with a
diagonal line.
Figure 29: Cassette assembly
5. Measure and note the dimension A.
Figure 30: Dimension A
NOTICE
Brush the threads of the tightening bolts with a steel-
wire brush and then grease before loosening them.
6. Keep the four bolts in position, according to the follow-
ing gure. Loosen the other bolts and remove them.
Figure 31: Loosen the bolts
Keep the two
bolts closest
below the upper
port holes
Keep the two
bolts closest
above the lower
port holes
Mark
Inspect

190.210-IOM (SEP 21)
Page 16
LazerWeld II Plate Heat Exchanger
Maintenance
7. Open the remaining four bolts alternately and diago-
nally in two steps. See the following gures.
NOTICE
Be careful to ensure that the frame plate and pressure
plate are always in parallel. Skewing of the pressure
plate during opening must not exceed 10 mm (2 turns
each bolt) across the width and 25 mm (5 turns each
bolt) vertically..
a. Loosen the four bolts alternately and diagonally until
the plate package is approximately 5% greater than
the A dimension (1.05A).
Figure 32: Loosen the bolts based on dimension A
b. Loosen the two diagonal pairs of bolts alternately, as
shown in the following gure.
Figure 33: Loosen the diagonal pairs of bolts
8. Open the plate pack by letting the pressure plate glide
on the carrying bar.
CAUTION
To avoid hand injuries from sharp edges, always wear
protective gloves when handling cassettes and
protective sheets.
NOTICE
Number the cassettes before removing them.
Cassettes do not need to be removed if cleaning is
done using only water, or without cleaning agent.
Figure 34: Remove the cassettes
WARNING
The plate pack may still contain a small residual
amount of liquid after draining. Depending on the
type of product and type of installation, special ar-
rangements, such as drainage box, may be necessary
to avoid injury to personnel and damage to equip-
ment.
Manually cleaning opened units
CAUTION
Never use hydrochloric acid with stainless steel
plates. Water of more than 330 ppm Cl may not be
used for the preparation of cleaning solutions. It is
very important that carrying bars and support col-
umns in aluminium are protected against chemicals.
NOTICE
Be careful not to damage the gasket during manual
cleaning.
Deposits removable with water and brush
Note: For manual cleaning of heat exchangers in refriger-
ant services, contact your Frick representative.
WARNING
If necessary, use appropriate protective equipment.
Consider risks like loose particles and what kind of
media has been used in the PHE.
A
A

190.210-IOM (SEP 21)
Page 17
LazerWeld II Plate Heat Exchanger
Maintenance
1. Start cleaning the cassette when the heating surface is
still wet and the cassettes are hanging in the frame.
2. Remove deposits using a soft brush and running water.
Figure 35: Clean with brush and water
3. Rinse with water using a high pressure hose.
Figure 36: Rinse the cassette
Deposits not removable with water and brush
Cassettes must be removed from the PHE during cleaning.
WARNING
Use appropriate protective equipment, such as safety
boots, safety gloves and eye protection, when using
the cleaning agents.
WARNING
Corrosive cleaning liquids can cause serious injuries
to skin and eyes!
1. Brush with cleaning agent.
Figure 37: Brush with cleaning agent
2. Rinse immediately with water.
Figure 38: Rinse the cassette
NOTICE
Long exposure to the cleaning agents can damage
the gasket glue.
Regasketing
These procedures apply to eld gaskets and ring gaskets
afxed to the cassettes using glue free clip-on tabs.
NOTICE
Before removing the old gaskets check how they
are placed and attached. Especially the end cassette
gasket conguration needs attention.
Clip-on and clip-grip
1. Open the LZWII (see Opening)and remove the cassette
that needs a new gasket.
NOTICE
Before opening the LZWII check the warranty condi-
tions. If in any doubt, contact a Frick sales represen-
tative. See Warranty conditions.
2. Remove the old gasket.
3. Ensure that all sealing surfaces are dry, clean, and free
of foreign matter such as fat, grease, or similar.
4. Check the gasket and remove rubber residual before
attaching it.
5. Attach the clip gasket to the cassette. Slip the gasket
prongs under the edge of the plate. Fix the eld gasket
diagonal using tape on the small tabs. Contact your
Frick representative for advice on the gasket placement
of the respective cassette type.

190.210-IOM (SEP 21)
Page 18
LazerWeld II Plate Heat Exchanger
Maintenance
Figure 39: Gaskets
NOTICE
Make sure the two gasket prongs of the clip-on tabs
are in the correct position.
6. Repeat the procedure until all cassettes that need to be
regasketed are done. Close the LZWII. See Closing.
Adhesive tape
The following procedure applies to end cassette gasket
supports and distance rings fastening by means of adhe-
sive tape around the ports and along the sides.
Adhesive tape (GC1) is a simple and secure way to position
gasket. Affix the gasket to the groove using a special tape
gun, which enables you to apply the tape exactly where
required.
1. Open the LZWII (see Opening)and remove the cassette
to be regasketed.
NOTICE
Before opening the LZWII check warranty terms and
conditions. If in doubt, contact your Frick sales rep-
resentative. See Warranty conditions.
2. Remove the old gasket.
3. You do not need to remove any old tape because the
lm is very thin. Ensure that the gasket groove is clean
and dry however.
4. Apply tape using the tape gun.
Figure 40: Regasketing the cassette
5. Attach the gasket to the cassette. The gasket place-
ment of the respective cassette type can be advised by
your Frick representative.
6. Close the heat exchanger, (see Closing).
Glued gaskets
Use glue suggested by Frick. Separate gluing
instructions are delivered together with the glue.
Note: Do not use glued gaskets in refrigerant side of the
heat exchanger.
CAUTION
Other glues than those suggested can contain chlo-
rides that can damage the plates.
CAUTION
Do not use sharp tools when removing the glued
gasket to avoid damage to the plates.
Closing
Follow these instructions to ensure that the LZWII is cor-
rectly closed.
1. Check that all the sealing surfaces are clean.
2. Brush the threads of the bolts clean using a steel wire
brush or thread cleaner. Lubricate the threads with a
thin layer of grease, such as Gleitmo 800 Lubriplate or
equivalent.
Ring gasket
Field gasket
diagonal
Field gasket

190.210-IOM (SEP 21)
Page 19
LazerWeld II Plate Heat Exchanger
Maintenance
Figure 41: Brush the threads
3. Attach gaskets to the cassettes or check that all the
gaskets are correctly attached. Check that all gaskets
are correctly positioned in the grooves.
NOTICE
If the gasket is wrongly positioned, it can rise out
of the gasket groove or be positioned outside the
groove.
4. Insert the cassettes in alternate directions and with
the gaskets turned towards the frame plate or pres-
sure plate as specied on the plate hanging list. Use
the marked line that was done when the LZWII was
opened. See Step 3 in the Opening section.
Figure 42: Inserting the cassettes
5. If the cassettes are correctly assembled, the edges
form a honeycomb pattern. See the following gure.
Figure 43: Honeycomb pattern
6. Press the plate assembly together. Tightening is done
in two steps. See the following substeps. Be careful to
ensure that the frame plate and the pressure plate are
always in parallel.
a. Tighten the two diagonal pairs of bolts alternately
until the plate package measures 1.10A.
Ensure that the frame plate and pressure plate are
always in parallel. Skewing of the pressure plate
during opening must not exceed 10 mm (2 turns a
bolt) across the width and 25 mm (5 turns a bolt)
vertically.
Figure 44: Tightening the plate assembly
b. After that, bolts are tightened alternately and diago-
nally. Check the dimension A during tightening at the
positions of the bolts that are being used.
Figure 45: Tightening the plate assembly
NOTICE
For the nal tightening, alternate between bolts to
reach dimension A.
1.10A
1.10A

190.210-IOM (SEP 21)
Page 20
LazerWeld II Plate Heat Exchanger
Maintenance
Maximum tightening torque
When using a pneumatic tightening device, see Table 2 for
maximum torque. Measure dimension A during tightening.
Table 2: Torque measurement
Bolt
size Approx. rod dia. Bolt with bearing box Bolt with washers
in. N·m ft-lb N·m ft-lb
M24 0.95 - - 450 332
M30 1.18 585 431 900 664
M39 1.54 1300 959 2000 1475
M48 1.89 2100 1549 3300 2434
For manual tightening, the tightening torque has to be
estimated.
If dimension A cannot be reached:
• Check the number of cassettes and the dimension A.
• Check that all the nuts and bearing boxes are running
freely. If not, clean and lubricate, or replace.
• Leave the LZWII between 24 h to 48 h, the longer the
better, for gaskets to relax.
Place the other bolts in position.
• Inspect the washers.
• When fully tightened, ensure the bolts are all equally
tensioned.
Figure 46: Tensioning the bolts
Pressure testing after maintenance
Before start-up of production, whenever cassettes or gas-
kets have been removed, inserted or exchanged, perform
a pressure test to conrm the internal and external sealing
function of the LZWII. During this test, one media side at a
time must be tested with the other side open to the ambi-
ent pressure.
CAUTION
Perform the pressure testing at a pressure equal to
the operating pressure of the actual unit, but never
above the design pressure as stated on the name-
plate.
The required test time is 10 min for each media. Always
check that the local regulations of this procedure are
fullled.
Note: LZWII units for refrigeration applications and units with me-
dia not mixable with water must be dried after hydrostatic
pressure testing. If refrigerants are in the welded channels,
they must be tested with inert gas, such as N2.
Consult the local ofce/representative of the supplier for
advice on the pressure testing procedure.
Storing the LZWII
Frick delivers the LZWII ready to be put into service upon
arrival if nothing else has been agreed. However, keep the
heat exchanger in the packing box until installation.
Regarding storage for longer periods of time, one month
or more, it is necessary to make certain precautions to
avoid unnecessary damage to the LZWII.
NOTICE
Frick and its representatives reserve the right to in-
spect the storage space and/or equipment whenever
necessary until the date of expiry of the warranty
period stipulated in the contract. Notication has to
be given 10 days before the date of inspection.
If there is any uncertainty about the storage of the PHE,
consult your Frick Representative.
Storage in packing box
If the storage environment is known in advance, inform
Frick when ordering the heat exchanger to ensure that it is
correctly prepared for storage before packing.
Indoor storage
Ensure the following when storing indoors:
• Store inside a room with the temperature between 60°F
and 70°F (15°C and 20°C) and humidity around 70%. For
outdoor storage see Outdoor storage.
• To prevent damage to the gaskets, ensure there is no
ozone-producing equipment in the room such as elec-
tric motors or welding equipment.
• To prevent damage to the gaskets, do not store organic
solvents or acids in the room and avoid direct sunlight,
intensive heat radiation or ultraviolet radiation.
• Cover the tightening bolts well with light grease
coating.