Laird OL 4503 Installation instructions

OL 4503 Oil-Air Cooling Unit
Specification and User Manual Version 3.5

2
Laird Thermal Systems.
Prumyslová 497
462 11 Liberec
Czech Republic
Phone: +420 488 575 111
www.lairdthermal.com
Any information furnished by Laird and its agents, whether in specifications, data sheets, product catalogues or otherwise, i
s believed to be (but is not warranted as being) accurate and
reliable, is provided for information only and does not form part of any contract with Laird. All specifications are subject
to change without notice. Laird assumes no responsibility and
disclaims all liability for losses or damages resulting from use of o
r reliance on this information. All Laird products are sold subject to the Laird Terms and Conditions of sale (including Laird’s
limited warranty) in effect from time to time, a copy of which will be furnished upon request.
© Copyright
2018-2021 Laird Thermal Systems, Inc. All rights reserved. Laird™, the Laird Ring Logo, and Laird Thermal Systems™ are trademarks or registered trademarks of Laird Limited
or its subsidiaries.

3
Table of Contents
Revision History.................................................................................................................................... 5
1. About this Manual ......................................................................................................................... 6
1.1 Terms of Guarantee ......................................................................................................................6
1.2 Contact Information.......................................................................................................................7
2. Product Identification ................................................................................................................... 8
2.1 Unit Specifications.........................................................................................................................8
2.2 Identification Plate.........................................................................................................................8
3. Safety Regulations........................................................................................................................ 9
3.1 Hazard classes..............................................................................................................................9
3.2 Safety Symbols .............................................................................................................................9
3.3 Hints for Safe Operation..............................................................................................................10
3.4 Prevent Hazards .........................................................................................................................10
3.5 Hints Regarding the Electrical Equipment ..................................................................................10
3.6 Environmental Issues..................................................................................................................11
3.7 Protective Clothing ......................................................................................................................11
3.8 Safety Equipment........................................................................................................................11
3.9 Safety and Signaling Equipment included in the Unit .................................................................11
3.10 Guards.......................................................................................................................................12
3.11 Caution Labels ..........................................................................................................................13
3.12 In Case of Accidents .................................................................................................................13
3.12.1 First aid at accidents with oil ..............................................................................................13
4. Product Description.................................................................................................................... 14
4.1 Intended Use...............................................................................................................................14
4.2 Use not in Conformance with the Intended Use .........................................................................14
4.3 Unit Components ........................................................................................................................15
4.4 Cooling Circuit.............................................................................................................................15
4.5 Specifications ..............................................................................................................................16
Dimensions and weight .................................................................................................................16
Performance data..........................................................................................................................16
Environmental conditions ..............................................................................................................16
Settings .........................................................................................................................................16
4.6 Setting-up Requirements ............................................................................................................17
Installation Location ......................................................................................................................17
Environmental Conditions .............................................................................................................17
4.7 Infrastructure ...............................................................................................................................17
5. Transport...................................................................................................................................... 18
5.1 Safety Indications for Transportation and Setting-up..................................................................18
5.2 Transportation of the Unit............................................................................................................18
5.3 Unpacking ...................................................................................................................................18
6. Initial Operation........................................................................................................................... 19

4
6.1 Safety Indications Related to Initial Operation............................................................................19
6.2 Setting to Work............................................................................................................................19
6.3 Cooling Circuit Connection and Filling........................................................................................20
6.4 Electrical Connections.................................................................................................................22
6.5 Carrying out Setting to Work.......................................................................................................22
6.6 Daily Start-up ..............................................................................................................................23
6.7 Setting to work after Storage ......................................................................................................23
7. Controlling the Unit..................................................................................................................... 24
7.1 Safety Indications for Controlling the Unit...................................................................................24
7.2 Switching on the Unit ..................................................................................................................24
7.3 Switching off the Unit ..................................................................................................................24
7.4 Settings .......................................................................................................................................25
7.5 Pressure Setting on the Angle-type Safety Valve.......................................................................25
7.6 Setting the Thermostat................................................................................................................26
8. Disruptions .................................................................................................................................. 27
8.1 Disruption in Operation ...............................................................................................................27
8.2 Trouble Shooting.........................................................................................................................27
9. Maintenance and Cleaning............................................................................................................. 28
9.1 Maintenance Schedule................................................................................................................28
9.2 Cleaning of Heat Exchanger .......................................................................................................28
9.3 Refilling of Coolant ......................................................................................................................28
9.4 Cleaning of Unit Casing ..............................................................................................................28
10. Repair ....................................................................................................................................... 29
11. Dismounting, Disposal, Storage............................................................................................ 30
11.1 Temporary Placing out of Operation .........................................................................................30
11.2 Re-packaging of the unit ...........................................................................................................30
11.3 Storing the Unit .........................................................................................................................30
11.4 Disposal ....................................................................................................................................30
11.5 Disposal of Operating Materials................................................................................................31
11.6 Return of the unit to Laird Thermal Systems ............................................................................31
1. Wear Parts and Spare Parts....................................................................................................... 32
Addendum............................................................................................................................................ 34
Performance Chart............................................................................................................................34
Flow Scheme ....................................................................................................................................35
Wiring Diagram .................................................................................................................................36

5
Revision History
REV
DATE
DESCRIPTION
NAME
PAGE
1.0
29-Nov-13
First version
Edom/Pfeiffer
2.0
06-Jul-15
Spare part numbers changed
Dany/Bitenaite
p. 33
3.0
29-jun-17
Updated format
H. Sharef
All
3.1
24-apr-18
Updated safety valve
A. Wolf
p. 25, 34
3.2
07-Jun-19
Pump capacity changed
O.Lundqvist
p.16
3.3
04-Sep-20
Specs. for Shell Diala updated to S4 from S3
A.Olsson
p.16
3.4
25-Feb-2021
Replaced 95205237.00 with 2066.00
A.Kim
p. 34
3.5
7-Jul-2021
Reformated manual to Laird Thermal
Systems Template
M. Maria

6
1. About this Manual
This document is the English translation of the original Operation Manual in German language for the
Oil-Air Cooling Unit OL 4503 (called unit in the following). It is based on German safety regulations. In
your country other regulations may apply.
This Operational Manual addresses the needs of the user of the unit. Its intention is to allow the safe
operation of the unit. Thus, it should be read carefully and be kept in a space accessible for the users
of the unit at any time.
All chapters of this Operation Manual can be read independently and thus can be used for look-up
purposes.
1.1 Terms of Guarantee
General sale and delivery terms of LAIRD apply. The buyer accepts these terms, at the latest when
signing the contract of purchase.
The particular terms of guarantee and duration of guarantee of the unit in question can be taken from
the contract documents as well as from the order confirmation.
Warranty claims and liability are excluded in case of one of the following situations:
Use of the unit in an unintended way
Inaccurate installation, putting into service, operation, repair or maintenance of the product by
people that are not fully authorized
Use of the product despite of defect, wrongly implemented or non-functional safety devices or
protective gear
Unauthorized or forbidden modifications by the user concerning the electrical equipment of the
unit
Unauthorized or forbidden modifications by the user concerning the mechanical structure of the
unit
Unauthorized or forbidden modifications by the user concerning the operating parameters
Use of unauthorized tools
Use of unauthorized operating supplies
Exceedance of mandatory maintenance intervals
Cases of disaster caused by foreign matter influence or act of nature beyond control
NOTE
Any form of unintended use of the unit and any structural change caused by the user without
prior authorization in written form by L
aird Thermal Systems will lead to the termination of
warranty as well the termination of the declaration of conformation and will free
Laird Thermal
Systems from product liability. This concern includes safety devices as well.
In case of authorized changes or when adding optional equipment, it is the sole responsibility of the
customer to assure the accurate implementation of the safety devices required.

7
1.2 Contact Information
If you have questions with respect to this unit please use the contact information given below. Always
communicate the following:
Your name and address
Name of contact at your address
Product data as on identification plate: Type of unit, serial number and year of manufacture
Company contact:
Laird Thermal Systems
Prumyslová 497
462 11 Liberec
Czech Republic
Post: Laird Thermal Systems GmbH

8
2. Product Identification
2.1 Unit Specifications
Manufacturer
Laird Thermal Systems GmbH
Type of product
Oil-air cooler
Type of unit
OL 4503
Article number
1264.00
Table 1: Unit specifications
2.2 Identification Plate
The identification plate is attached to the front side of the unit (see Fig. 1).
Fig. 1: Position of identification plate
1
Identification plate
Fig. 2: Unit specific identification plate
1
Unit type
2
Article number
3
Serial number 4
Electrical specifications
5
Date of manufacture
1
5
2
3
4
1

9
3. Safety Regulations
3.1 Hazard classes
In this document safety instructions are using standardized representation and symbols. Depending
on the probability of their incidence and the severances of consequences three hazard classes are
used.
CAUTION
Reference to noticeable danger for humans or possible damage to property.
Inobservance may lead to reversible injuries or to damage to property.
3.2 Safety Symbols
In this Operation Manual concrete safety instructions are given in order to point out unpreventable
residual risks when operating the unit. These risks include danger for
Human beings
The unit and other equipment
The environment
The safety symbols used in this manual are indicated below. The main reason for their use is to point
the reader to the safety instruction given in the text field beside.
Symbol
Meaning
Warning with respect to general danger or damage to property
Warning with respect to electrical hazard
Table 2: Warning Signs
Symbol
Meaning
This symbol indicates the requirement of wearing safety gloves
This symbol indicates that disconnecting from mains is required.
Table 3: Table 3: Signs giving orders
DANGER
Reference to direct danger for humans.
Inobservance will lead to irreversible injuries or exitus.

10
3.3 Hints for Safe Operation
NOTE
Conduct inspections on a regular time base!
This will ensure that the appropriate measures will be carried out indeed.
The unit is operational save. It was built according to the existing state of technology.
Despite this the unit could cause hazards if it
is used in a way it was not intended for
is used improperly
is operated under unsuitable conditions
3.4 Prevent Hazards
Hazards can be prevented by safety-conscious and anticipatory behavior of staff.
Everybody working with the unit should keep the following in mind:
Make this Operation Manual available for everybody at the operational location of the unit in a
complete and perfectly readable form!
Use the unit exclusively for what it was intended!
The unit must be operational and error free. Check the condition of the unit before working with it
and within a regular time frame!
Make sure that nobody can injure himself by any part of the unit!
Any disruption or recognizable change concerning the unit should be reported to the responsible
person!
Stick to the accident prevention regulations as well as any regional regulations!
3.5 Hints Regarding the Electrical Equipment
When working on electrical installations the following principles should be observed:
Works on the electrical installations may only be accomplished by qualified electrical staff!
When connecting electrical equipment to mains regional regulations must be observed. Be aware
of the information in the wiring diagram!
The unit is powered by electricity. Electrical shock hazard exists, if the electrical installations are
defective or the insulation fails during operation.
When switched off the unit is not disconnected from mains. This is only the case when the mains
plug is pulled.
Any changes regarding the control elements of the unit can have an influence on the safe
operation. All intended changes must be authorized by the manufacturer.
After the implementation of a change the safeguard operations must be verified.
No unauthorized changes on the unit are allowed. All intended changes must be authorized by
the manufacturer.
DANGER
Danger to life through electrical shock when working on the electrical equipment of the unit!
Switch off the unit before starting your work!
Disconnect the unit from mains by pulling the mains plug!
Verify that the installation is dead (volt-free)!
Carry out earthing or short circuiting!

11
3.6 Environmental Issues
Environmentally conscious and anticipatory behavior of staff avoids environmentally hazardous
impacts.
The following principles apply for environmentally conscious behavior:
Environmentally hazardous substances must not get into the ground or the drains. They should
be kept in appropriate containers.
Environmentally hazardous substances must be fed to utilization or disposal according to
regional regulations.
When dealing with operating supplies always keep aware of the safety data sheet of the
corresponding manufacturer.
3.7 Protective Clothing
When doing a job that leads to contact of the skin with the coolant (e.g. filling-up of the coolant
container):
Wear safety gloves made of PVC, neoprene or nitrile rubber
3.8 Safety Equipment
NOTE
The safety equipment listed below must be integrated in the
local control environment by the customer,
unless otherwise noted. These works must be carried out only by trained experts. All required
information can be taken from the wiring diagram shown in the addendum.
Safety equipment must not be modified, removed or taken out of operation. All parts of the safety
equipment must be accessible at all times.
3.9 Safety and Signaling Equipment included in the Unit
The unit is equipped with safety equipment at critical spots (see Fig. 3)
The water throughput is controlled by a flow control device that must be integrated in the
potential-free safety circuit of the device to be cooled.
The maximum temperature of the cooling circuit is controlled by a non-variable thermostat with
an opener contact that must be integrated into the safety circuit of the device to be cooled.
The maximum pump pressure is limited by a safety valve that by-passes the liquid stream when
the pressure pre-set is exceeded.

12
Fig. 3: Safety equipment
3.10 Guards
Direct access to hazardous parts or areas of the unit is restricted by the unit cover. The cover may
only be removed for the purpose of maintenance or repair works and shall be replaced prior to taking
the unit back to operation. The cover is fixed by four screws which can be unscrewed using a metric
AF10 wrench.
Fig. 4: Guards
1
Unit cover
1
Thermostat
2
Flow control device (flow switch)
3 Angle-type safety valve 4 Inspection glass, level indicator
1
1
2
3
4

13
3.11 Caution Labels
Danger spots on the unit are indicated corresponding to German safety regulation BGV A8
"Sicherheits- und Gesundheitsschutzkennzeichnung am Arbeitsplatz".
Caution labels on the unit must be easily readable at all times. Illegible caution labels must be
exchanged without delay.
Fig. 5: Caution labels on the unit
1
Hint for using the correct cap on oil filler
3.12 In Case of Accidents
Should you or another person be injured when working with the unit:
Stay calm!
Render first aid!
Call the company first-aider without exception!
3.12.1 First aid at accidents with oil
The unit employs oil as a coolant in a closed-loop configuration. In case of damage oil can leak from
the circuit and cause hazards.
Long term or repeated contact with skin without appropriate cleaning may obstruct the skin pores
and may lead to irregularities as oil acne or folliculitis.
When exposed to oil always observe the safety data sheet of the manufacturer.
1

14
4. Product Description
4.1 Intended Use
The oil-air cooler OL 4503 is used for the cooling of an oil circuit. Oil circulates between the cooling
unit and the device to be cooled. The oil is recooled by an air-cooled heat exchanger. The maximum
cooling capacity depends on the ambient air temperature (see page 16).
The unit is exclusively intended for use in industrial and commercial environments.
The intended use also includes the observance and following of all hints given in this Operation
Manual.
4.2 Use not in Conformance with the Intended Use
Operation of the unit under improper operational conditions is not allowed, since otherwise the
operation safety cannot be granted.
When using the unit in a way not compliant with the intended use, hazardous situations may occur.
Operation of the unit is not allowed under the following conditions:
The unit is used for a purpose other than the one it is intended for.
The unit or parts of it are damaged, the electrical installation is not correct or the insulation is
broken.
Protective or safety equipment is not functional or defect, improperly installed or missing.
The unit is not working properly.
Controlling devices were modified in a way that is not permitted.
Operational parameters were changed in a way that is not permitted.
Operation in areas exposed to explosion hazards
Operation with cooling media not according to specification
Use of unauthorized tools
Exceedance of the compulsory maintenance intervals
NOTE
The manufacturer is not liable for damage
occurring when using the unit in a way it was not intended for.
When using the unit in a way it was not intended for, the manufacturer’s warranty given by
Laird
Thermal Systems
will expire.

15
4.3 Unit Components
Additional information can be retrieved from the flow scheme shown in the addendum. The unit
consists of the following main components:
Fig. 6: Main components
1
Cooling circuit
2
Coolant container
3
Sheet-metal hood
4.4 Cooling Circuit
In the cooling circuit the coolant (i.e. the oil) is driven by the pump to the device that is to be cooled
and back via the return flow. The heat is dissipated into the ambient air by an air-cooled heat
exchanger. Exceedance of the maximum pump pressure is prevented by a bypass circuit. The oil
temperature is controlled by an electronic thermostat. Oil throughput is controlled by a flow control
device.
Fig. 7: Main components
1
Stop valve
2
Fan
3
Oil drain screw
2
1
3
1
3
2

16
4.5 Specifications
Dimensions and weight
Length:
650 mm
Width:
350 mm
Height:
750 mm
Weight:
49.6 kg (empty)
Coolant capacity:
23 liters (Shell Diala S4-ZXIG)
Table 4: Dimensions and weight
Performance data
Cooling capacity:
4500 Watts at 22.8 K difference between the
oil outlet temperature and the ambient air
temperature
Pump capacity:
> 20 lpm at 4.7 bar
Mains voltage:
230 VAC ±10% 50/60 Hz
Power input:
785 Watts (Pmax; 230 V; 50 Hz)
1058 Watts (Pmax; 230 V; 60 Hz)
Table 5: Performance data
Environmental conditions
Operating temperature:
-10°C ... +40°C
Storage temperature:
-25°C ... +70°C
Relative humidity:
20% … 90%
Table 6: Environmental conditions
Settings
Flow control device
14.0 ± 0.3 lpm
Thermostat
55 ± 3 °C
Maximum pressure
9.0 +0.5/-0.2 bar
Table 7: Settings

17
4.6 Setting-up Requirements
Installation Location
The location must be even.
When choosing the installation location, the following must be kept in mind: the air flow of the
cooling air must not be restricted, forward and back flow connections must be easily accessible
and all tubes must be installed without sharp bends.
Environmental Conditions
CAUTION
Risk of damage through unsuitable environmental conditions.
Damage to property and corrosion damage may result and are not covered by manufacturer’s
liability.
The unit is only authorized for use in indoor environments.
The unit must not be stored or operated in aggressive, humid environments.
The unit must not be stored or operated outdoor.
Pay attention to the environmental conditions as given in the specifications on page 16.
4.7 Infrastructure
The following infrastructure is required for connecting the unit:
Parameter
Rated value
Operating voltage
230 VAC
Table 8: Required infrastructure

18
5. Transport
5.1 Safety Indications for Transportation and Setting-up
CAUTION
Risk of injury by lifting the unit!
The weight of the unit is more than 50 kg.
Do not lift the unit manually!
Always use proper auxiliary means such as a forklift or a jack lift!
5.2 Transportation of the Unit
The unit is delivered wrapped in foil on a transportable pallet. Leave the unit on the pallet until
bringing it into service. Use a forklift or jack lift for transportation to the installation location.
CAUTION
Risk of damage by improper transportation!
Transport the unit in upright position.
Do not tilt the unit or expose it to impacts.
5.3 Unpacking
Remove the foil before setting up the unit!
Inspect the unit regarding:
Damage caused by transportation
Completeness of delivery
Lift the unit with a forklift or jack lift off the transportable pallet.
Dispose of the packaging material in accordance with regional regulations.
NOTE
Laird Thermal Systems
advises to keep the transportable pallet for later transportation of the unit.

19
6. Initial Operation
6.1 Safety Indications Related to Initial Operation
CAUTION
Danger of malfunction caused by faulty connections during initial operation!
Before switching on the unit make sure that
All safety equipment of the unit is implemented and functional
All connections were properly made
Nobody is endangered by the start-up of the unit.
Please follow the rules in chapter Safety Regulations on page 9.
6.2 Setting to Work
Placement
Fig. 8: Minimum clearance for air entrance and air exit
1
Ventilation grid
1) Move the unit to its installation location as mentioned in chapter 4.
2) Place the unit in a way that air entrance and air exit are not obstructed. Wall clearance must not be
less than 0.5 m, otherwise cooling capacity may be restricted.
NOTE
In case of storage of the
unit at temperatures lower than 5°C or higher than 40°C for longer periods
please wait 3 hours prior to initial operation to allow for temperature adjustment.
1
min. 0.5 m
min. 0.5 m
1

20
6.3 Cooling Circuit Connection and Filling
CAUTION
Risk of damage by using improper cooling hoses!
This may lead to damage to persons, damage to the unit or corrosion damage.
When choosing cooling hoses pay attention to sufficient burst strength and compatibility with
coolant!
Only use cooling hoses without any signs of damage!
The cooling hoses are connected to the unit by means of screwed hose nipples.
Oil inlet and oil outlet are indicated with respective symbols.
Fig 9: Labelling of oil inlet and oil outlet
NOTE
When operating the unit make sure only
to use the operation coolant container cap. This cap allows for
pressure equilibrium in the cooling system (breathing). Save the transportation cap for later
transportation purposes (e.g. when sending the unit back for repair).
Oil Inlet
Oil Outlet
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