Sterling 682.88107.00 User Manual
Upright Hot Oil
Temperature Control Units
Part Number: 682.88107.00
Bulletin Number: SC1-660.3
Effective: 10/22/2009
Write Down Your Serial Numbers Here For Future Reference:
_________________________ _________________________
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We are committed to a continuing program of product improvement.
Specifications, appearance, and dimensions described in this manual are subject to change without notice.
DCN No. ____________
© Copyright 2009
Shipping Info
Unpacking and Inspection
You should inspect your portable hot oil tcu for possible shipping damage.
Thoroughly check the equipment for any damage that might have occurred in transit, such as
broken or loose wiring and components, loose hardware and mounting screws, etc.
In the Event of Shipping Damage
According to the contract terms and conditions of the Carrier, the responsibility of the
Shipper ends at the time and place of shipment.
Notify the transportation company’s local agent if you discover damage.
Hold the damaged goods and packing material for the examining agent’s inspection. Do not
return any goods before the transportation company’s inspection and authorization.
File a claim with the transportation company. Substantiate the claim by referring to the
agent’s report. A certified copy of our invoice is available upon request. The original Bill of
Lading is attached to our original invoice. If the shipment was prepaid, write us for a
receipted transportation bill.
Advise customer service regarding your wish for assistance and to obtain an RMA (return
material authorization) number.
If the Shipment is Not Complete
Check the packing list as back-ordered items are noted on the packing list. You should have:
; Portable Hot Oil TCU
; Bill of lading
; Packing list
; Operating and Installation packet
; Electrical schematic and panel layout drawings
; Component instruction manuals
Re-inspect the container and packing material to see if you missed any smaller items during
unpacking.
If the Shipment is Not Correct
If the shipment is not what you ordered please contact the parts and service department
immediately at (262) 641-8610. Have the order number and item number available. Hold the
items until you receive shipping instructions.
Returns
Do not return any damaged or incorrect items until you receive shipping instructions from the
shipping department.
Upright Portable Hot Oil TCUs Chapter 1: Safety ii
Table of Contents
CHAPTER 1: SAFETY ................................................................ 5
1-1 How to Use This Manual.............................................................................................5
Safety Symbols Used in this Manual.....................................................................5
1-2 Warnings and Precautions..........................................................................................6
1-3 Responsibility..............................................................................................................7
General Responsibility...........................................................................................7
Operator Responsibility.........................................................................................8
Maintenance Responsibility...................................................................................9
Reporting a Safety Defect .....................................................................................9
CHAPTER 2: FUNCTIONAL DESCRIPTION............................ 10
2-1 Models Covered in This Manual................................................................................10
2-2 General Description...................................................................................................10
2-3 Standard Features.....................................................................................................10
Mechanical Features...........................................................................................10
Electrical Features...............................................................................................11
Controller Features..............................................................................................11
2-4 Options......................................................................................................................11
2-5 Feature Descriptions.................................................................................................12
Immersion Heaters..............................................................................................12
Heater Tank.........................................................................................................12
Pump...................................................................................................................12
Ful-Flo Valve .......................................................................................................12
Connection Lines.................................................................................................13
Electrical System Controls...................................................................................13
Electrical Panel and System Components ..........................................................13
Air Purge .............................................................................................................14
Pressure Switch ..................................................................................................14
Safety Thermostat...............................................................................................14
Reservoir Tank....................................................................................................14
Cooling (Optional) ...............................................................................................15
2-6 Safety Devices and Interlocks...................................................................................15
CHAPTER 3: INSTALLATION ................................................... 17
3-1 Uncrating the Equipment...........................................................................................17
3-2 Rigging and Placing the TCU....................................................................................17
Installation Location Considerations....................................................................17
3-3 Electrical Connections...............................................................................................18
3-4 Setup Procedures......................................................................................................19
Connecting Piping ...............................................................................................19
Connecting Process Piping .................................................................................20
3-5 Initial Start-up............................................................................................................22
Starting the Hot Oil TCU......................................................................................22
CHAPTER 4: OPERATION ....................................................... 24
Upright Portable Hot Oil TCUs Chapter 1: Safety iii
Start-up......................................................................................................................24
4-1
4-2 Controller Description & Operation............................................................................24
Identifying Control Panel Switches......................................................................25
Identifying System Status Board Indicators.........................................................26
Status Indicator Lights.........................................................................................27
Mode Indicator Lights..........................................................................................27
Fault Indicator Lights...........................................................................................27
4-3 Returning Fluid to the Tank.......................................................................................28
4-4 Shutting Down the Hot Oil TCU.................................................................................28
CHAPTER 5: MAINTENANCE .................................................. 30
5-1 Maintenance Schedule..............................................................................................30
5-2 Preventative Maintenance.........................................................................................31
Routine Servicing................................................................................................31
Draining the Unit for Storage...............................................................................31
Preventative Pump Maintenance.........................................................................31
5-3 Corrective Maintenance ............................................................................................32
Pumps and Seals ................................................................................................32
Maintaining the Pump..........................................................................................33
Thrust Bearing Adjustment..................................................................................35
Installation of Carbon Graphite Bushings............................................................35
CHAPTER 6: TROUBLESHOOTING ......................................... 36
6-1 Introduction................................................................................................................36
CHAPTER 7: APPENDIX .......................................................... 39
7-1 Optional Components................................................................................................39
7-2 Technical Specifications............................................................................................40
Annex B Information............................................................................................40
7-3 Drawings and Diagrams............................................................................................42
7-4 Spare Parts List.........................................................................................................45
7-5 Returned Material Policy...........................................................................................48
Credit Returns .....................................................................................................48
Warranty Returns ................................................................................................48
7-6 Safety Tag Information..............................................................................................48
TCU Safety Tags.................................................................................................48
7-7 TCU Identification (Serial Number) Tag....................................................................49
7-8 Technical Assistance.................................................................................................49
Parts Department ................................................................................................49
Service Department.............................................................................................49
Sales Department................................................................................................49
Contract Department...........................................................................................49
Upright Portable Hot Oil TCUs Chapter 1: Safety iv
Chapter 1: Safety
1-1 How to Use This Manual
Use this manual as a guide and reference for installing, operating, and maintaining your
portable hot oil temperature control unit (TCU). The purpose is to assist you in applying
efficient, proven techniques that enhance equipment productivity.
This manual covers only light corrective maintenance. No other maintenance should be
undertaken without first contacting a service engineer.
The Functional Description section outlines models covered, standard features, and safety
features. Additional sections within the manual provide instructions for installation, preoperational procedures, operation, preventive maintenance, and corrective maintenance.
The Installation chapter includes required data for receiving, unpacking, inspecting, and setup
of the portable hot oil TCU. We can also provide the assistance of a factory-trained
technician to help train your operator(s) for a nominal charge. This section includes
instructions, checks, and adjustments that should be followed before commencing with
operation of the portable hot oil TCU. These instructions are intended to supplement
standard shop procedures performed at shift, daily, and weekly intervals.
The Operation chapter includes a description of electrical and mechanical controls, in
addition to information for operating the portable hot oil TCU safely and efficiently.
The Maintenance chapter is intended to serve as a source of detailed assembly and
disassembly instructions for those areas of the equipment requiring service. Preventive
maintenance sections are included to ensure that your portable hot oil TCU provides
excellent, long service.
The Troubleshooting chapter serves as a guide for identification of most common problems.
Potential problems are listed, along with possible causes and related solutions.
The Appendix contains technical specifications, drawings, schematics, parts lists, and
available options. A spare parts list with part numbers specific to your machine is provided
with your shipping paperwork package. Refer to this section for a listing of spare parts for
purchase. Have your serial number and model number ready when ordering.
Safety Symbols Used in this Manual
The following safety alert symbols are used to alert you to potential personal injury hazards.
Obey all safety messages that follow these symbols to avoid possible injury or death.
DANGER! DANGER indicates an imminently hazardous situation that, if not avoided,
will result in death or serious injury.
WARNING! WARNING indicates a potentially hazardous situation or practice that, if
not avoided, could result in death or serious injury.
Caution! CAUTION indicates a potentially hazardous situation or practice that, if
not avoided, may result in minor or moderate injury or in property damage.
Upright Portable Hot Oil TCUs Chapter 1: Safety 5
1-2 Warnings and Precautions
Our equipment is designed to provide safe and reliable operation when installed and operated
within design specifications, following national and local safety codes. This may include, but
is not limited to OSHA, NEC, CSA, SPI, and any other local, national and international
regulations.
To avoid possible personal injury or equipment damage when installing, operating, or
maintaining this equipment, use good judgment and follow these safe practices:
; Read and follow these operation and installation instructions when installing,
operating, and maintaining this equipment. If these instructions become damaged or
unreadable, additional copies are available from the manufacturer.
; Follow all SAFETY CODES.
; Wear SAFETY GLASSES and WORK GLOVES.
; Work only with approved tools and devices.
; Disconnect and/or lock out power before servicing or maintaining the equipment.
; Use care when LOADING, UNLOADING, RIGGING, or MOVING this
equipment.
; Operate this equipment within design specifications.
; OPEN, TAG, and LOCK ALL DISCONNECTS before working on equipment.
You should remove the fuses and carry them with you.
; Make sure the equipment and components are properly GROUNDED before you
switch on power.
; When welding or brazing in or around this equipment, make sure VENTILATION is
ADEQUATE. PROTECT adjacent materials from flame or sparks by shielding with
sheet metal. An approved FIRE EXTINGUISHER should be close at hand and
ready for use if needed.
; Do not restore power until you remove all tools, test equipment, etc., and the
equipment and related components are fully reassembled.
; Only PROPERLY TRAINED personnel familiar with the information in this
manual should work on this equipment.
We have long recognized the importance of safety and have designed and manufactured our
equipment with operator safety as a prime consideration. We expect you, as a user, to abide
by the foregoing recommendations in order to make operator safety a reality.
Upright Portable Hot Oil TCUs Chapter 1: Safety 6
1-3 Responsibility
These machines are constructed for maximum operator safety when used under standard
operating conditions and when recommended instructions are followed in the maintenance
and operation of the machine.
All personnel engaged in the use of the machine should become familiar with its operation as
described in this manual.
Proper operation of the machine promotes safety for the operator and all workers in its
vicinity.
Each individual must take responsibility for observing the prescribed safety rules as outlined.
All warning and danger signs must be observed and obeyed. All actual or potential danger
areas must be reported to your immediate supervisor.
General Responsibility
No mater who you are, safety is important. Owners, operators and maintenance personnel
must realize that every day, safety is a vital part of their jobs.
If your main concern is loss of productivity, remember that production is always affected in a
negative way following an accident. The following are some of the ways that accidents can
affect your production:
• Loss of a skilled operator (temporarily or permanently)
• Breakdown of shop morale
• Costly damage to equipment
• Downtime
An effective safety program is responsible and economically sound.
Organize a safety committee or group, and hold regular meetings. Promote this group from
the management level. Through this group, the safety program can be continually reviewed,
maintained, and improved. Keep minutes or a record of the meetings.
Hold daily equipment inspections in addition to regular maintenance checks. You will keep
your equipment safe for production and exhibit your commitment to safety.
Please read and use this manual as a guide to equipment safety. This manual contains safety
warnings throughout, specific to each function and point of operation.
Upright Portable Hot Oil TCUs Chapter 1: Safety 7
Operator Responsibility
The operator’s responsibility does not end with efficient production. The operator usually has
the most daily contact with the equipment and intimately knows its capabilities and
limitations.
Plant and personnel safety is sometimes forgotten in the desire to meet incentive rates, or
through a casual attitude toward machinery formed over a period of months or years. Your
employer probably has established a set of safety rules in your workplace. Those rules, this
manual, or any other safety information will not keep you from being injured while operating
your equipment.
Learn and always use safe operation procedures. Cooperate with co-workers to promote safe
practices. Immediately report any potentially dangerous situation to your supervisor or
appropriate person.
REMEMBER:
• NEVER place your hands or any part of your body in any dangerous location.
• NEVER operate, service, or adjust the temperature control unit without appropriate
training and first reading and understanding this manual.
• Before you start the temperature control unit check the following:
• Remove all tools from the tcu;
• Be sure no objects (tools, nuts, bolts, clamps, bars) are laying in the
TCUs operating area;
• If your TCU has been inoperative or unattended, check all settings before starting the
unit.
• At the beginning of your shift and after breaks, verify that the controls and other
auxiliary equipment are functioning properly.
• Keep all safety guards in place and in good repair. NEVER attempt to bypass, modify,
or remove safety guards. Such alteration is not only unsafe, but will void the warranty
on your equipment.
• When changing control settings to perform a different mode of operation, be sure
selector switches are correctly positioned. Locking selector switches should only be
adjusted by authorized personnel and the keys removed after setting.
• Report the following occurrences IMMEDIATELY:
• unsafe operation or condition
• unusual temperature control unit action
• leakage
• improper maintenance
• NEVER stand or sit where you could slip or stumble into the
temperature control unit while working on it.
• DO NOT wear loose clothing or jewelry, which can be caught while working on a tcu.
In addition, cover or tie back long hair.
Upright Portable Hot Oil TCUs Chapter 1: Safety 8
• Clean the tcu and surrounding area DAILY, and inspect the machine for loose, missing
or broken parts.
• Shut off power to the tcu when it is not in use. Turn the switch to the OFF position, or
unplug it from the power source.
Maintenance Responsibility
Proper maintenance is essential to safety. If you are a maintenance worker, you must make
safety a priority to effectively repair and maintain equipment.
Before removing, adjusting, or replacing parts on a machine, remember to turn off all electric
supplies and all accessory equipment at the machine, and disconnect and lockout electrical
power. Attach warning tags to the disconnect switch.
When you need to perform maintenance or repair work on equipment above floor level, use a
solid platform or a hydraulic elevator. If there is a permanently installed catwalk on your
equipment, use it. The work platform should have secure footing and a place for tools and
parts. DO NOT climb on equipment, machines, or work from ladders.
If you need to repair a large component, use appropriate handling equipment. Before you use
handling equipment (portable “A” frames, electric boom trucks, fork trucks, overhead cranes)
be sure the load does not exceed the capacity of the handling equipment or cause it to become
unstable.
Carefully test the condition of lifting cables, chains, ropes, slings, and hooks before using
them to lift a load.
Be sure that all non-current carrying parts are correctly connected to earth ground with an
electrical conductor that complies with current codes. Install in accordance with national and
local codes.
When you have completed the repair or maintenance procedure, check your work and remove
your tools, rigging, and handling equipment.
Do not restore power to the equipment until all persons are clear of the area. DO NOT start
and run the machine until you are sure all parts are functioning correctly.
BEFORE you turn the machine over to the operator for production, verify all equipment
enclosure panels, guards and safety devices are in place and functioning properly.
Reporting a Safety Defect
If you believe that your equipment has a defect that could cause injury, you should
immediately discontinue its use and inform the manufacturer.
The principle factors that can result in injury are failure to follow proper operating procedures
(i.e. lockout/tagout), or failure to maintain a clean and safe working environment.
Upright Portable Hot Oil TCUs Chapter 1: Safety 9
Chapter 2: Functional Description
2-1 Models Covered in This Manual
This manual provides operation, installation, and maintenance instructions for portable hot oil
temperature control units. Model numbers are listed on the serial tag. Make sure you know
the model and serial number of your equipment before contacting the manufacturer for parts
or service.
Your portable hot oil temperature control unit circulates thermal transfer-type oil through
your process and precisely, automatically, and reliably maintains it at a temperature you can
select. Portable hot oil temperature control units are sized to meet the specific requirements
stated by the Customer at the time of purchase.
2-2 General Description
The operating range of your temperature control unit is from 100°F to 550°F (38°C to
288°C). The unit is best suited for use with a specially formulated Heat Transfer Fluid. A
recommended list of commercially available heat transfer fluids can be obtained through
Customer Service.
Rapid recirculation of the relatively small amount of fluid provides a close and uniform
temperature relationship between the TO PROCESS and FROM PROCESS lines. This does,
of course, depend on the configuration of your process, and any restrictions within the mold.
This recirculation, combined with the immersion heater and optional cooling capability, gives
fast and accurate response to bring the fluid up to temperature, or to changes in the settings
when needed.
Performance is assured through matching the unique controllers to the high temperature
system. The two systems are fully integrated to achieve accurate control, along with efficient
use of water and electricity.
2-3 Standard Features
Mechanical Features
• Dual stage immersion heater with IEC contactors
• 550°F (288ºC) maximum operating temperature {400°F (244°C) maximum operating
temperature for 6 kW heaters}
• Manual bypass
• Pressure switch for low pump pressure shut-down
• To Process pressure gauge
• Independent safety thermostat
• Y strainer on From Process line
• Automatic venting sequence
• Positive displacement pumps capable of reversing to evacuate the process
• Easily removable panels for quick access to internal components
• 1 year warranty on parts and labor (Labor at factory)
Upright Portable Hot Oil TCUs Chapter 2: Functional Description 10
Electrical Features
• Non-fused lockable rotary disconnect
• Branch circuit fusing
• NEMA 12 electrical enclosure
• UL listed subpanel
Controller Features
• M2B+ microprocessor controller with fuzzy logic; includes diagnostic features with
indicator and warning status lights
• System status graphic display
• Low level alarm for reservoir
• Audible alarm
• 5 year warranty on controller
2-4 Options
Options marked with “*” indicate options that can be factory installed or retrofitted in the
field.
• Drain valve
• Hour meter; measures total pump run time hours
• General fault visual alarm
• Autovent sequence; deducts available
• Low level alarm; deducts available
• High level indicator light
• Manual bypass; deducts available
• M2B+ microprocessor controller options include:
• 4-20 mA remote set point and retransmission
• SPI protocol, RS-485
• General protocols, types RS-232, -485
• Remote sensor; 10 Ft. (3m)
• Heat exchanger options of 3.9 sq. ft. (0.3627 sq. m) and 6.7 sq. ft. (0.6231 sq. m)
• Remote controller
• Lexan cover
• Optional operating voltages of 208/3/60, 230/3/60, 575 /3/60, 380 /3/50, and 415/3/50
Upright Portable Hot Oil TCUs Chapter 2: Functional Description 11
2-5 Feature Descriptions
Immersion Heaters
The fluid is heated by the specially designed three-phase low watt density electrical
immersion heater, and regulated by the controller. The standard heater has a steel sheath for
low watt density and good heat transfer.
These models can be supplied with 6, 12, 18, or 24 kW low watt density immersion heaters,
depending upon the heating needs of the process. The 18 and 24 kW models are built to
provide full or partial heat as required by the process and determined by the controller, to
provide more precise control.
Heater Tank
The Upright features a single pass heater tank. The tank is designed to maintain an optimum
balance of fluid velocity versus watt density, and turbulence for excellent heat transfer, and
minimal pressure drop. The high fluid velocity will greatly prolong the life of the heater and
fluid.
Pump
The pump is a mechanical seal, positive displacement pump. It features a nearly maintenance
free design, and was selected after extensive testing to provide superior performance,
flexibility, and low maintenance. It is well suited for use with a variety of commercially
available heat transfer fluids. The pump has only two internal moving parts, and a specially
designed seal to give years of trouble free service, even at high temperatures. The only
routine maintenance required is the monthly greasing and occasional head space adjustment;
see Section 5-3 on Page 40 for more information.
The pump is capable of running in either direction. Thus, the pump reverse feature can be
used to draw fluids back from the process. It is not necessary to install a service air line to
purge lines before changing molds. Since the pump is capable of achieving extremely high
pressures, it is necessary to regulate the pressure through use of a regulating bypass line (FulFlo valve). Because the pump is a positive displacement pump, it will supply the process with
rated flow at or below the rated pressure.
The flow is constant until the pressure reaches the rated pressure. The pressure however is a
function of frictional losses through the process that it is attached to. Systems with large
process connections, ports, and piping will operate at low pressures. While systems with
small process connections, ports, and piping will operate at higher pressures. Once pressure
requirements exceed the rated pressure, the Ful-Flow valve will open and bypass the
necessary fluid to prevent high pressures.
Ful-Flo Valve
A regulating bypass line featuring a Ful-Flo valve is standard in all units. This is a safety
device to prevent excessive pressure in the event that the delivery line is obstructed. Each
Ful-Flo valve is factory preset to limit system pressure as specified by the customer. It must
not be tampered with in any way.
In the event of an obstruction in the line, the Ful-Flo valve will open and divert fluid from the
delivery TO PROCESS line to the return FROM PROCESS line. A constant flow of fluid is
maintained through the heater tank to prevent damage to the heating elements and fluid.
Upright Portable Hot Oil TCUs Chapter 2: Functional Description 12
Connection Lines
Connections for TO PROCESS and FROM PROCESS lines are 1" NPT (25.4 mm). Water
connections for COOLING WATER SUPPLY and COOLING WATER DRAIN are ¾” NPT
(19.1 mm); see Section 3-4 on Page 20 for more information. The customer is responsible for
conversions to metric standards.
The manufacturer stocks many lengths of flexible metal hose; the part number is 572-16969.
State the length of hose you want when ordering.
WARNING! Component failure may result in high-temperature oil spray, causing serious injury or
death. Make sure hoses, valves, and other components installed in your process can
withstand maximum temperature and pressure of the Upright unit; check unit
nameplate for specific capacities. All components must be carefully inspected for
condition before installing. Make sure you have factory components if you have any
doubt.
Electrical System Controls
The electrical controls of your Upright unit are specially engineered for reliability, safety, and
simplicity of operation. Switch functions are clearly labeled. Your Upright unit has a system
status board so you can evaluate the status and performance of the unit at a glance. Pilot
lights are provided to indicate key unit functions.
An audible alarm is standard with your unit. The alarm will sound in the event of the
following conditions:
• motor overload
• safety thermostat trip (over temperature)
• low fluid pressure
• low fluid level
• high fluid level (optional)
Push the ALARM SILENCE button to silence the alarm. See Section 4-2 on Page 25 for
more information on control functions.
Electrical Panel and System Components
The pump motor and immersion heater operate on three-phase, 50/60 cycle, nominal voltage
with the control circuit at 115 V single phase. The control circuit voltage is provided by a
single phase machine tool transformer with primary fuse protection and a grounded
secondary. A main power disconnect is included for ease of service. The electrical panel is
UL listed and complies with N.F.P.A. 79 provisions.
All components are IEC rated for long life and reduced maintenance. The heater elements are
branch fused, and protected from contactor welding by a separate primary voltage contactor.
The pump motor is controlled by a full voltage magnetic reversing starter, with fused branch
circuit overcurrent and thermal overload protection. Many additional features are available as
options.
A NEMA 12 enclosure is standard, with NEMA 4 available as an option.
Upright Portable Hot Oil TCUs Chapter 2: Functional Description 13
Air Purge
Upon initial start-up and mold/process change-out, you’ll need to purge all air and water from
the system. The Upright unit has appropriate valving to ensure complete purging. Procedures
are covered in Section 3-5 on Page 23.
WARNING! Failure to purge the system of air before heating may result in serious injury or critical
system and equipment damage. Make sure you properly purge the system of air before
starting the heater cycle.
Pressure Switch
A pressure switch is built into each unit to guard against heater damage. This feature prevents
the heater elements from being energized unless the pump is running and fluid is in the
system. After a preset time, the pump shuts down if the fluid pressure is not re-established.
The pressure switch is preset at the factory; do not tamper with it.
Safety Thermostat
The safety thermostat is a J-thermocouple sensing, adjustable fail-safe device located in the
heater tank. This is to guard against the unlikely event of “runaway” heating. If over-heating
does occur, the safety thermostat shuts down the heater outputs and sounds an audible alarm.
A red pilot light on the status board also illuminates. The unit continues to pump fluid
through the system to prevent heater damage. Auxiliary factory installed alarms such as
beacons and klaxons are available as options.
All controller functions are locked out until the main supply power is disconnected. Resetting
the alarm condition is initiated by depressing the red pump stop button. The reset button is
located inside the electrical enclosure, mounted on the left wall of the enclosure. It is
imperative that a qualified maintenance technician determine and correct the cause of the
fault before resuming operation.
Reservoir Tank
A reservoir tank with sight gauge is standard; usable capacity is seven (7) gallons (26.5
liters). The tank permits thermal expansion of the heat transfer fluid, and provides makeup
fluid.
WARNING! The reservoir tank may cause serious injury if it ruptures from not being properly
vented. Make sure that the reservoir tank is always properly vented to prevent tank
rupture.
The reservoir tank drain is extended beyond the base of the unit for ease of draining. Optional
ball valves are available to further simplify draining
.
Upright Portable Hot Oil TCUs Chapter 2: Functional Description 14
Cooling (Optional)
The manufacturer-designed shell and tube heat exchanger is provided as optional equipment
in this unit. The design features U-tube construction and copper-nickel tubes for durability
and optimal heat transfer.
The modular construction (unique to our units) allows the tube bundle to be easily removed
for periodic cleaning. Additionally, check valves are installed on the water supply and drain
lines to prevent water from back flowing into the heat exchanger from a closed drain or into
the water supply piping.
The controller automatically regulates cooling by opening and closing the cooling solenoid.
This allows the proper amount of cooling water to pass through the tubes of the heat
exchanger and out the drain. A water supply of 75 psi (517.1 kPa/5.2 bars) maximum is
required for connection to the heat exchanger.
2-6 Safety Devices and Interlocks
This section includes information on safety devices and procedures that are inherent to the
portable hot oil tcu. This manual is not intended to supersede or alter safety standards
established by the user of this equipment. Instead, the material contained in this section is
recommended to supplement these procedures in order to provide a safer working
environment.
At the completion of this section, the operator and maintenance personnel will be able to do
the following:
• Identify and locate specific safety devices.
• Understand the proper use of the safety devices provided.
• Describe the function of the safety device.
Safety Circuit Standards
Safety circuits used in industrial systems protect the operator and maintenance personnel
from dangerous energy. They also provide a means of locking out or isolating the energy for
servicing equipment.
Various agencies have contributed to the establishment of safety standards that apply to the
design and manufacture of automated equipment. The Occupational Safety and Health
Administration (OSHA) and the Joint Industrial council (JIC) are just a few of the
organizations that have joined with the plastics industry to develop safety standards.
Every effort has been made to incorporate these standards into the design of the portable hot
oil tcu; however, it is the responsibility of the personnel operating and maintaining the
equipment to familiarize themselves with the safety procedures and the proper use of any
safety devices.
Upright Portable Hot Oil TCUs Chapter 2: Functional Description 15
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