BLUEM

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LABORATORY OVEN
OPERATION & MAINTENANCE MANUAL
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LO-27, -90, -136, -225 LO-430, -850

Model No. 's LO - 27, 90, 136, 225, 430, & 850

•TPS Tharmal Product SOiutions

2821 Old Route 15

New Columbia, PA 17856
570-538-7200 Fax: 570-538-7380
Rev. 11/16/10

MODEL: LO-90-P

Model LO-xx Series Laboratory Oven Page 1

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SECTION Page

INFORMATION

1.0 COMPANY INFORMATION & ASSISTANCE 4

2.0 SAFETY WARNINGS & SYMBOLS 5,6

3.0 PRODUCT SPECIFICATIONS & OVERVIEW

3.1 Overview 7,8

3.2 Conditioning Functions 8
3.3 Control Equipment 8,9
3.4 Operating Parameters and Requirements 9

4.0 DRAWINGS, INFORMATION, and VENDOR INSTRUCTION LISTINGS 10

5.0 INSTALLATION INSTRUCTIONS

5.1 Delivery and Uncrating of Unit 11

5.2 Location and Installation of Unit 11
5.3 Equipment Access & Features 12-15
5.4 Power Supply Specifications and Connection 16-18
5.5 Application of Power 18

SYSTEMS and CONTROL

6.0 AIR CIRCULATION SYSTEM

6.1 System Overview - Models LO-27 thru LO-225 ______________ 19

6.2 Basic Airflow Description - Models LO-27 thru LO-225 20,21
6.3 System Overview - Models LO-430 & LO-850 22
6.4 Basic Airflow Description - Models LO-430 & LO-850 23

7.0 ELECTRIC HEATING SYSTEM & CONTROL _ ____________ 24,25

8.0 TEMPERATURE CONTROLLER

8.1 Controller Features _______________________ 26

8.2 Entering Temperature & Process Cycle Time Setpoints 27
8.3 Cancelation of timing function when the external process cycle timer is used 27
8.4 Controller Adjustments during Oven Operation 28
8.5 Controller Configuration 28

9.0 EXTERNAL PROCESS CYCLE TIMER ___ __________ ___ 29

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10.0 OVERTEMPERATURE PROTECTION 29

11.0 PROFILING TEMPERATURE CONTROLLER (Optional)

11.1 OveNiew __________________________ 30

11.2 FP93 Quick Program Setup Guide __________________ 30,31

12.0 OPTIONAL EQUIPMENT & FEATURES ---------------- 31

CHAMBER OPERATION & MAINTENANCE

13.0 SEQUENCE of OPERATION 32

14.0 PREVENTATIVE MAINTENANCE 33

14.1 Maintenance Checks/ Procedures 33-36

14.2 Preventative Maintenance Schedule/ Log 37
14.3 Troubleshooting Guide 38

SUPPLEMENTAL INSTRUCTIONS

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MODELS LO-225, L0-136, LO-90, LO-27

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111.0 COMPANY INFORMATION & ASSISTANCE II

Congratulations on purchasing a chamber from one of the fine divisions of TPS - Thermal Product Solutions.
You probably already know us as Lunaire Limited. We've changed our name and expanded our vision with
the intent to provide you with more diversified solutions to your thermal product process requirements.

We truly hope that every aspect of chamber design and quality will measure up to your strictest standards.
Your chamber has been designed to operate with the reliability you expect for the demands you impose on
your product and research testing.

Headquartered in New Columbia, Pennsylvania, which is located in the North-central part of the state, TPS
includes the following five divisions that manufacture environmental test chambers and industrial ovens.

Note: Blue M Model LO-xx series Lab Ovens are manufactured by TPS subsidiary Tianyu Equipment
Company located in Chengdu, China.

Tenney Environmental - - - - Lunaire Environmental - - - - Gruenberg Oven - - - - Blue M - - - - Lindberg

Parts and service inquiries for equipment within each division should be directed to TPS by any of the
following methods.

important! Piease have the Modei and Serial Numbers of your unit availabie when contacting us.

Model No. __________ Serial No. __________

Thermal Product Solutions

•TPS Thorm.LI Product Soll.Jti0n$
PO Box 150
White Deer, PA 17887
} Mailing Address

Thermal Product Solutions

2821 Old Route 15 } Physical Address
New Columbia, PA 17856

Phone: 570 - 538 - 7200

Fax - Parts Dept. 570 - 538 - 7385

Fax - Service Dept. 570 - 538 - 7391

Fax - Main: 570 - 538 - 7380

E - Mail Address: service@lunaire.com

Web site: www.thermalproductsolutions.com

Parts Replacement

Your equipment has been designed and manufactured to provide years of reliable service. In the event a
component should fail, it is recommended that only OEM approved parts be used as replacements. Please
contact the Parts Department for component replacement, or repair.

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.0 SAFETY WARNINGS & SYMBOL

You must follow these and all Warning statements listed throughout the manual!

1. Read this entire Operation Manual, as well as the vendor manuals and cut-sheets provided before
operating this equipment! Failure to adhere to any Safety Warning, or failure to follow the proper
operating procedures listed throughout any of the information provided, could cause damage to your
equipment, persona! injury, or death.

2. Obey all "CAUTION", "DANGER", and "WARNING" signs/ labels mounted on the equipment. Do not
remove any of these signs/ labels.

3. Do not use this equipment in any manner not specified in this manual. Improper use may impair the
safety features employed and will void your warranty.

4. Warning! This chamber is NOT designed for use with volatile or explosive materials. Do not
install test articles that may release explosive or flammable vapors in the chamber. Loading of such
materials may result in explosion or fire.

5. Operators and service personnel must be familiar with the location and function of all controls and the
inherent dangers of the equipment before operating or maintaining it.

6. Only qualified service personnel should ever be permitted to perform any service-related procedure on
this equipment!

7. Do not place the unit near combustible materials or hazardous fumes or vapors.

8. Do not install unit in a corrosive environment. A corrosive environment may lead to poor performance
and deterioration of the unit.

9. Make sure the oven is leveled when set up. The floor of the chamber should be leveled with a Spirit
Level to+/- 1/8" (3.175 mm) front to back and side to side. Otherwise, the oven door may swing shut
on personnel if unit is tilted.

10. Do not position the oven in a manner that would make it difficult to operate your main power
disconnect switch.

11. Your power supply line voltage may be too low or too high to property and safely operate your
equipment. Before making the power supply connection to your equipment, you must follow the
specific directions stated under "Power Connection" in the Installation Instructions section. Failing to
perform the directions stated may damage your equipment and void your warranty!

12. The control panel and the machinery compartment contain exposed electrical connections. Keep
panels in place properly where applicable when the unit is in operation. Disconnect and Lock-Out/
Tag-Out all electrical power from the unit at its source before servicing or cleaning.

13. Do not adjust any mechanical components or any electrical components except as directed in this
manual.

14. Never place any test objects directly on the floor of the workspace. It is not designed to support any
weight. The conditioning plenum is located beneath the floor and placement of any objects on it will
cause abnormal operation including overheating of the unit. This may damage the unit. You must place
all test objects on the product shelves supplied.

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15. Do not exceed the temperature rating of your oven.

16. Human exposure to temperature extremes can cause injury. Do not open oven doors until oven
temperature drops below 200 ° F (93 ° C), when applicable. Take appropriate precautions before
opening oven doors and upon handling any chamber contents.

17. Always cool the oven down below 167° F (75° C) before shutting it down. Otherwise, damage to the
circulation motor shaft bearings will result.

18. Do not modify any component on this unit. Use only original equipment manufactured (OEM) parts as
replacement parts. Modifications to any component, or the use of a non-OEM replacement part could
cause damage to your equipment, personal injury, or death.

INTERNATIONAL WARNING / SAFETY SYMBOL DEFINITIONS

Obey all "DANGER", "WARNING", and "CAUTION" labels shown in the manual and mounted on the
equipment. Do not remove any labels mounted on the equipment.

"WARNING OF HAZARDOUS AREA"

"WARNING OF DANGEROUS ELECTRIC VOLTAGE"

"WARNING OF HOT SURFACE"

"EARTH (GROUND) PROTECTIVE CONDUCTOR TERMINAL"

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113.0 PRODUCT SPECIFICATIONS & OVERVIEW I

3.1 Overview

Tianyu Laboratory Ovens are engineered to provide a wide range of temperature conditions with an efficient
airflow management system that provides high level temperature uniformity.

This manual applies to the LO-xx-E / LO-xx-P series of Laboratory Ovens, which are manufactured in six
different sizes to accommodate a diversity of product applications. The number in the model indicates
workspace capacity in liters. The letter "E" indicates a non-profiling type controller is used. Letter "P"
indicates a profiling controller is used.
• Models LO-27, -90, -136, -225 (Conditioning Plenum Mounted Below Workspace)
• Models LO-430, -850 (Conditioning Plenum Mounted Above Workspace)

These ovens are designed for laboratory, mine, research institute, agriculture, hospital, baking, drying,
sterilization, and heat treatment applications.

Temperature Specifications

The following temperature specifications apply to all standard lab ovens.

• Operating temperature range: From + 10° C above ambient to + 260° C, ± 1° C after stabilization
• Temperature Uniformity: ± 3.0° C
■ Temperature Ramp Rate: 4 ° CI Min. (Ambient Temp. to Max. Temp.)

Construction Specifications

Lab Oven Model LO-xx series are constructed with an exterior made of cold rolled steel, and an interior
made of Type SUS304 stainless steel. A baked-on powder-coated enamel finish provides long-lasting
corrosion protection.

Two inches of fiberglass insulation is installed between the workspace and chamber shell to minimize heat
loss. A high quality silicone door seal insures positive sealing and long life. Additional construction
specifications are listed in the charts below.

MODELS LO-27 thru LO-225

MODEL LO-27 LO-90 LO-136 LO-225

Interior W xDxH 11.8 X 11.8 X 11.8 17.7 X 17.7 X 17.7 21.6x17.7x21.6 23.6 X 19.6 X 29.5
Dimensions Inches/ mm 300 X 300 X 300 450 X 450 X 450 550 X 450 X 550 600 X 500 X 750

Cubic Feet 0.95 3.2 4.8 7.8

Exterior W xDxH 19.7 X 19.3 X 30.7 25.6 X 25.2 X 36.6 29.5 X 25.2 X 40.5 31.5x27.1x48.4
Dimensions Inches/ mm 500 X 490 X 780 650 X 640 X 930 750 X 640 X 1030 800 X 690 X 1230

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MODELS LO -430 and LO-850

MODEL LO-430 LO-850

Interior WxDxH 20.5 X 26 X 51.2 31.1 X 28 X 57.1
Dimensions Inches/ mm 520 X 660 X 1300 790 X 710 X 1450

Cubic Feet 15 30

Exterior WxDxH 28.3 X 31.3 X 73.2 39 X 33.3 X 79.1

Dimensions Inches/ mm 720 X 795 X 1860 990 X 845 X 2010

3.2 Conditioning Functions

- - For Models LO-27 thru LO-225, the conditioning plenum is mounted beneath the workspace floor.
- - For Models LO-430 and LO-850, the conditioning plenum is mounted above the workspace.

• Heating of the oven is achieved by recirculating chamber air through an electric stainless steel sheathed
type heater mounted in the conditioning plenum.
• Air circulation is generated by a centrifugal type blower wheel mounted in the conditioning plenum. The
blower wheel is directly driven by an externally mounted motor. Airflow through the workspace is in a
horizontal pattern from right to left.
• Adjustable air intake and exhaust ports enable the removal of process moisture and vapors with the
repiacement of fresh ambient air. Cooling of the oven is enr1anced with both ports fuiiy open.

3.3 Control Equipment

Temperature Control:
Model LO-xx-E Oven Series

Temperature conditions are controlled by a Shanghai Yatai Instrumentation Co. Model YLD-2000
Temperature Controller. The YLD-2000 is a non-profiling type single channel controller that features time
proportioned heat control. A 100 O hm Platinum RTD is used to measure temperature.

Model LO-xx-P Oven Series

Temperature conditions are controlled by a Shimaden Company, Ltd. Model FP93 Program Controller. The
FP93 is a profiling type single channel controller that features up to 40 step programming, with 3 Event
Outputs, 4Digital Inputs, and 4 D igital Outputs. D ata communications is optional using Type RS-232C or
RS-485. A 100 Ohm Platinum RTDis used to measure temperature.

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Overtemperature Protection:

Overtemperature protection is provided with an OTP Controller that features a 3 digit pushbutton dial for
entry of the high temperature limit. This controller will disable power to the heater when an overtemperature
condition is detected. A 100 Ohm Platinum RTD is used to measure temperature.

External Timer:

The Xinling Electrical Company, Lid. Model DH48S-2Z Timer is provided tor extended process cycle timing
when the Model YLD-2000 Temperature Controller is used. The YLD-2000 maximum timing function is 999
minutes (16.65 hours). The DH48S-2Z permits up to 99 hours, 99 minutes to be programmed using plus /
minus pushbuttons with dial type indicators. A red four digit display is employed to indicate elapsed time
(count-up mode).

3.4 Operating Parameters and Requirements

This equipment is designed to operate safely when the following environmental conditions are met:

■ Indoor use only.

■ Within a temperature range of 5 ° C to 30 ° C (max).
■ Maximum relative humidity 90%.

The listed chamber specifications are based on operation at 24 ° C ambient temperature, altitude at sea level,
and a 60 Hz power supply. Chamber operation utilizing a 50 Hz power supply may derate the listed
performance specifications.

Equipment damage, personal injury, or deatl"t may resuit if this equipment is operated or maintained by
untrained personnel. Operators and service personnel must be familiar with the location and function of all
controls and the inherent dangers of the equipment before operating or maintaining it. TPS shall not be liable
for any damages, including incidental and/or consequential damages, regardless of the legal theory
asserted, including negligence and/or strict liability. Observe all safety warnings and operating parameters
listed in this manual, as well as all Caution, Danger, and Warning signs or labels mounted on the equipment
to reduce the risk of equipment damage and personal injury.

Questions? Please consult a TPS Applications Engineer or our Service Dept. for questions, and for
additional information. And thanks for choosing a Blue M Oven!

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4.0 DRAWINGS, INFORMATION, and VENDOR INSTRUCTION LISTINGS

The following drawings are provided:

Electrical Schematics:

■ Model LO-27 XXX

■ iviodei LO-90 XXX

■ Model LO-136 XXX

■ Model LO-225 XXX

• Model LO-430 XXX

• Model LO-850 XXX

Components Layout XXX

Note: Additional drawings may be provided when various options or custom features are employed.

The following information and vendor manuals are provided:

As applicable to the oven model and serial number, the following user manuals and instructions are included
in the Supplemental Instructions section.

Electrical Spare Parts List

Model YLD-2000 Temperature Controiier Manual
Model DH48 Series Timer (Used with YLD-2000 only)
Model FP93 Temperature Controller Manual (Optional)
Overtemperature Controller Manual

Spare Parts Lists:

Electrical spare parts that should be kept on hand at the customer's location are indicated in the Electrical
Spare Parts List, which is provided with this manual. The recommended spare parts are checked in the
corresponding column.

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1 s.o INSTALLATION INSTRUCTIONS

Read this section completely before attempting to install, or operate the equipment.

5.1 Delivery and Uncrating of Unit

Inspect equipment and shipping crate immediately upon receipt. If any damage is apparent, you should
discuss it with the trucking delivery person and contact the transportation company immediately. Make notes
of any damage on the Bill Of Lading. Retain all shipping materials for inspection. Any claims for damage
must start at the receiving point. Check packing slip carefully and make sure all materials have been
received as indicated on the packing ticket. Unless otherwise noted, YOUR ORDER HAS BEEN SHIPPED
COMPLETE.

Chambers and any remote machinery skids or control cabinets should be handled and
transported in an upright position. They must never be carried on their back, front, or any side
unless clearly indicated on the shipping pallet.

Important! Due to the vibration incurred during shipping and handling, it is possible that mechanical
connections could become loose. Check all connections to make sure they are secure.

5.2 Location and Installation of Unit

Your equipment has been fully operated, tested, and balanced in our plant prior to shipment, unless notified
otherwise. Follow the installation requirements below.
• Standard Oven Classification: NFPA 86 Class B ovens are heat utilization equipment operating at
approximately atmospheric pressure wherein there are no flammable volatiles or combustible material
being heated in the oven.

• Do not locate unit in areas of wide ambient temperature variation such as near vents or outdoor
entrances.

• Do not place the unit near combustible materials or hazardous fumes or vapors.
■ Do not install unit in a corrosive environment. A corrosive environment may lead to poor performance
and deterioration of unit.
• Ventilation: The oven should be installed in an area where there is good air ventilation. Allow a
minimum of 127 mm (5 inches) between any wall and any oven side.
• l\4ake sure that there is at least 1.5 m (4 ft. 11 in.) of space in front of the chamber to a!Jo\AJ for opening
the door.

• Do not position the oven in a manner that would make it difficult to operate your main power
disconnect switch.
• Make sure the oven is leveled when set up. The floor of the chamber should be leveled with a Spirit
Level to +/- 1 /8" (3. i 75 mm) front to back and side to side.

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5.3 Equipment Access & Features

Note: These photos apply to Models LO-27 thru LO-225 only. Photos for Models LO-430 and LO-850 will
follow.

._
Process Timer -+--......1

Main Circuit Breaker

FRONT VIEW MODEL LO-90

--­
Note: Your equipment
configuration may be
slightly different from
what is shown.

Exhaust Port
/ I..,,,.

..
TOP VIEW REP-.R V!EW

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ffi

Intake Port
Note: Your equipment

1111111111111
configuration may be

111111111111111111111111111111
Power Supply Cord slightly different from
what is shown.
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REAR VIEW

Power Supply Cord Entry

RTD Sensor Wires

Heater Termin

I I I I I I I I I I l IIIlIIl lllll l l l l

MACHINERY BASE FRONT VIEW

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Note: These photos apply to Models LO-430 and LO-850 only.

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i Exhaust
Port

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MODEL LO-430 - E MODEL LO-850 - P

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Timer Ov�rtemp. Powrr ll�atin� t\lar111

Temp.
&
CONTROL PANEL for LO-430 & LO-850 {"E" Series - Std. Controller}

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Ill
Overt 1•mp.
■
l'owPr Al<1ra

11
llraiin�

Temp.

CONTROL PANEL for LO-430 & LO-850 ("P" Series - Profiling Controller)

- Circ. Motors -

..

Main Power
Terminals
Main Circuit
POWER CABINET - TOP LEFT VIEW - MODEL LO-850-P Breaker

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5.4 Power Supply Specifications and Connection

Model / Supply Specifications Main Disconnect Recommended Rating

Model LO-27: 115VAC, 10.89A, 1PH, 60 HZ 15A

Model LO-90: 115VAC, 13.50A, 1PH, 60 HZ 20A

Model LO-136: 230VAC, 9.16A, 1PH, 60 HZ 15A

Modei LO-225: 230 VAC, •i3.50A, 1PH, 60 HZ 20A

Model LO-430: 230VAC, 31.50A, 1PH, 60HZ 40A

Model LO-850: 230VAC, 48.90A, 1PH, 60HZ 62A

Note: The SCCR Rating (Short Circuit Current Rating) is SKA for all units.

Warning! Before making the power supply connection to your unit, you must perform the following
procedure:

1. Verify the power supply voltage rating established for your chamber (listed above). The voltage rating
is also found on the serial tag on the side of the oven. Note the rated value here:

2. Measure and record the intended voltage source. Note the measured value here: ____

3. Reference the "Line Voltage Min/Max Tables" below. Verify that the power supply voltage source you
measured and recorded is within the minimum and maximum allowable operating voltages for your
chamber voltage rating. If it is not within this operating range, do not make the power connection!
Otherwise, erratic operation and damage may occur to your equipment, which may void your warranty.
If you have any questions, please call the T PS Service Department.

Important! One of the most common causes of

equipment malfunction is low line voltage as the power - 60 HERTZ SUPPLIES
source to the unit . Ordinarily in this condition, the heat LINE VOLTAGE MIN./ MAX. TABLE
output would be reduced and the system's motors
would operate erratically, eventually overheat, and shut Chamber Minimum Maximum
down. You must be certain that your equipment is Voltage Voltage Voltage
connected to a circuit with an adequate voltage and Rating
current source. An oversupply voltage would also cause
erratic operation and eventual shutdown, or damage to 115 104 127
your equipment . 230 207 253

60 Hz Operation outside these

Supply limits can result in damage
to chamber equipment.

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Making the Power Supply Connection to the Chamber:

Amain power disconnect switch is not provided with your chamber. We recommend that a fused disconnect
switch on a separate branch circuit be installed as the power source to your chamber, in accordance with all
national and local electrical codes. Reference your Electrical Schematic for all electrical requirements.

For the standard Model LO-27 thru LO-225 Ovens, the power connection is made via a 6 foot long cordset
(with plug). 120VAC and 230VAC power supply plugs are shown in the photos below. Connect the plug to a
proper receptacle that has the appropriate power supply on a branch circuit of its own. Power input lines are
connected to terminal blocks and are then run to the Main Circuit Breaker located on the right side of the
oven.

For the standard Model LO-430 and LO-850 Ovens, a 120 inch long power supply cord is provided without
�- This cord should be hard wired to a main power disconnect switch that is on a separate branch
circuit.

Warning! High Accessible Current - An Earth connection is essential before connecting the power
supply. Make sure your receptacle is properly grounded in accordance with a!! codes.

Warning! Make sure that all electrical wiring in your supply branch circuit is properly installed in
accordance with all National and Local Electric Codes. Make sure all connections are secure.

NEMA 5-15 NEMA 5-20 NEMA 6-15

OVEN MODEL PLUG USED SPECIFICATIONS

LO-27 E/P NEMA5-15 15A/115V

LO- 90E/P NEMA5-20 20A/115V
LO - 136 E/P NEMA6-15 15A/230V
LO - 225E/P NEMA6-20 20 A/230V

NEMA 6-20

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MAIN CIRCUIT BREAKER

5.5 Application of Powe;

• Before energizing any equipment, make a visual inspection for loose components, electrical connections,
fittings, etc. Shut all operating switches to the "OFF" position before energizing.

• Have trained personnel start and check out the equipment before its first cycle.

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116.0 AIR CIRCULATION SYSTEMS I

6.1 System Overview - Models L0-27 thru L0-225

A high volume horizontal airflow system is employed with an electric heating system to provide maximum
temperature uniformity. Heating and the generation of airflow occurs in the conditioning plenum, which is
located beneath the workspace floor. The plenum is isolated from the workspace to prevent direct heat
radiation to the product. Adjustable air intake and exhaust ports are provided to maintain a constant
exchange of process air with fresh ambient air.

CONDITIONING PLENUM WITH DUCT WALLS REMOVED

Air circulation is generated by a centrifugal type blower wheel, which is driven by an externally mounted
motor mounted in the machinery compartment. An electric stainless steel sheathed tubular heater is used for
heating. Heaters with higher wattage ratings are used in the larger ovens. The exhaust port is located on top
of the oven. The intake port is located at the lower left side of the oven with its opening centered into the
conditioning plenum.

100 Ohm Platinum RTD sensors are used by the main and limit controllers to measure temperature. Both
sensors are mounted in the discharge air along the right duct wall.

Note: The blower housing in the Model L0-225 is located closer to the center than shown in the photo
above

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6.2 Basic Airflow Description - Models L0-27 thru L0-225

Process air is drawn by the circulation blower down into the conditioning plenum from along the left side duct
wall. The air is heated as it flows through the heater bank and is discharged up into the right side duct wall.
Hot air flows into the workspace through perforations over the entire height and depth of the oven. It flows
horizontally across the vvorkspace to condition the product and exits through perforations in the left side duct
wall. Processed air returns to the conditioning plenum and the cycle continues.

A small percentage of recirculating air is exhausted out through the exhaust port, when opened. With the air
intake port also opened, fresh ambient air will mix in with the process air drawn into the conditioning plenum.
Enhanced cooling is achieved with the heating system turned off and both ports fully open .

.- - ___:..· . ----- - �i !
�
�-•,.,;_

Airflow

AIRFLOW Note: The diameter of the

pierced holes is larger than
shown for Models L0-225
thru L0-850.

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• •
• '
• s t'
�

• �1 . I • � • c::

A
Main Cont;oller I OTP RTD
RTD Sensor Sensor

RTD SENSORS

EXHAUST PORT

Warning of Hot Surface! When adjusting the exhaust port opening the operator should always
Ji'\.
grasp the handle either wear cloth or leather gloves, or utilize a tool so that hands do not come in
� direct contact with the metal. At the rated oven operating temperature of + 260° C, the structural
surface of the port will also roughly attain + 260° C. Be extremely careful!

The top of the oven becomes very warm during high temperature operation.

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6.3 System Overview - Models LO-430 & LO-850

A high volume horizontal airflow system is employed with an electric heating system to provide maximum
temperature uniformity. Heating and the generation of airflow occurs in the conditioning plenum, which is
located above the workspace. The plenum is isolated from the workspace to prevent direct heat radiation to
U1e product. Adjustable air intake and exhaust ports are provided to maintain a constant exchange of process
air with fresh ambient air.

CONDITIONING PLENUM

Air circulation is generated by two centrifugal type blower wheels, which are driven by externally mounted
motors mounted at the top of the oven. Electric stainless steel sheathed tubular heaters with expanded
stainless steel heat transfer fins are used for heating. Six heater elements are used in the Model LO-850
Three heater elements are used in the Model LO-430. The air intake port is located on the right side of the
oven while the air exhaust port is located on the left.

100 Ohm Platinum RTD sensors are used by the main and limit controllers to measure temperature. Both
sensors are mounted in the discharge air along the right duct wall.

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G.2 Basic Airflow Description - Models LO-430 & LO-850

Process air is drawn by the circulation blower down into the conditioning plenum from along the left side duct
wall. The air is heated as it flows through the heater bank and is discharged down into the right side duct
wall. Hot air flows into the workspace through perforations over the entire height and depth of the oven. It
fl01,vs horizontally across the workspace to condition the product and exits through perforations in the left side
duct wall. Processed air returns to the conditioning plenum and the cycle continues.

A small percentage of recirculating air is exhausted out through the exhaust port, when opened. With the air
intake port also opened, fresh ambient air will mix in with the process air drawn into the conditioning plenum.
Enhanced cooling is achieved with the heating system turned off and both ports fully open.

MODEL LO-430 MODEL LO-850

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7.0 ELECTRIC HEATING SYSTEM & CONTROL

The Heating system utilizes an electric stainless steel sheathed tubular heater that is mounted in the
conditioning plenum. xx inches of the heater ends are unheated. The unheated sections pass through fully
welded tubular stainless steel sleeves to the outside of the oven shell where the electrical connections are
made. Each heater end is secured and sealed by a compression fitting. These heaters have low watt density
and are supplied in higher wattage ratings with the large ovens.

A time proportioned heat control output of the main temperature controller is used to energize Solid State
Heater Relay SSR, which provides power to the heaters. SSR is mounted in the machinery compartment.
The heat enable contactor must be energized for the SSR to supply controlled power to the heater.

!ntake Port

SHEATHED HEATER (Photo Rotated) - Models L0-27 thru L0-225

SOLID STATE HEATER RELAY

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SHEATHED HEATERS - Model LO-850

Note: The Model L0-430 employs three heaters.

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HEATER TERMINALS - - MODEL LO-850

Model LO-xx Series Laboratory Oven Page 25

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8.0 TEMPERATURE CONTROLLER

8.1 Controller Features

Temperature conditions are controlled by a Shanghai Yatai Instrumentation Co. Model YLD-2000
Temperature Controller. The YLD-2000 is a non-profiling type single channel controller that features a time
proportioned heat control output. This output is used to energize the Solid State Heater Relay SSR, which
supplies power to the heater. An internal process cycle timing function is included. A 100 Ohm Platinum RTD
is used to measure temperature, which is placed in the discharge air on the right side duct wall.

Process Cycle Timing:

Important Note: An external process cycle timer is employed with the Model LO-xx-E series of ovens to
expand the timing range. The Mode! YLD-2000 incorporates a process cycle timing
function with a range from Oto 999 minutes (16.65 hours). The external process cycle
timer has an expanded timing function with a range from 0 to 99 hours, 99 minutes.

We recommended that the external process cycle timer be used for all process
timing. This timer is described in Section 9. For your convenience, the timing
function provided with the Model YLD-2000 is described on the next page.

Important Note: To cancel the timing function provided with the use of the external process cycle timer,
you must follow the procedure listed in Section 8.4.

Process Value OTP Controller

& Function
Pushbutton Dial
Setup Display
OVER TEMP
Setpoint
Value Display 9/ ---1--- Alarm Indicator
ALM
Controller
- Heat Output
'ON' Indicator RUN OUT ON Indicator

Function i"ey

HEAT

CONTROL PANEL

Note: For Models LO-430 and LO850, the YLD-2000 is configured as a distinct separate instrument with all
other control instrumentation spread out across the width of the control panel.

Model LO-xx Series Laboratory Oven Page 26

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8.2 Entering Temperature and Process Cycle Time Setpoints

NOTE: Refer to Section 9 to set the process cycle time with the external process cycle timer.

Note: If '000' is shown in the upper display at any time, this indicates that either the sensor is open or that
the input signal has exceeded the test range.

1. Press the Function Key O to enter the temperature setpoint. "SP" will be shown in the upper display.
The lower display will indicate the temperature setpoint value.

2. Press ihe .& and l'" keys io adjust the setpoint value in the lower display.

Skip Steps 3 & 4 below when using the external process cycle timer.

3. Press the Function Key O again to advance to the process cycle time setup. "ST' will be shown in
the upper display. The lower display will indicate the timed value in minutes.

When the lower display value is zero, the controller timing function is canceled.

Note: If the process cycle timing function is not desired, leave the "ST" value at "0" and press the
Function Key to return to the normal operation mode.

4. Press .A. and• buttons to set the desired process cycle time (in minutes) in the lower display.

5. Press the Function Key O again to store your setpoint(s) and to return to the normal operation mode.
6. Press the Heat Switch on the control panel to the On position to start the heating process. The small red
Heat Switch light will illuminate.

Whenever the controller heat output is turned On, the OUT light on the control panel will illuminate.

7. When oven temperature reaches the setpoint value, the process timing cycle will start. Once the timed
cycled is complete, the heating system will be shut down and the alarm buzzer will sound four times.

The RUN and OUT lights on the control panel will tum Off.

Note: Press the .A. key during timed operation to display remaining (count-up) time in the top display.

8.3 Cancelation of timing function when the external process cycle timer is used

1. Press the Function Key O for at least 4 seconds. "AL" will be shown in the top display and "0" will be
shown in the bottom display.

2. Press the Function Key O several times until "LK" is shown in the top display. "0" will be shown in the
bottom display. Press the .A. key until "18" is shown in the bottom display.

3. Press the Function Key O one time. "AL" will be shown in the top display and "0" will be shown in the
bottom display. Press the .A. key until "20" is shown in the bottom display. Note: If the customer wishes
to recover the timing function, set the bottom display value to "0".
.,,--...
4. Press the Function Key \ ...J for at least 4 seconds to enter the settings and to return to the normal
operating mode.

5. CYCLE POWER to the chamber by turning the Main Circuit Breaker OFF and then back ON.

Model LO-xx Series Laboratory Oven Page 27

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8.4 Controller Adjustments during Oven Operation

• If the temperature setpoint is adjusted during the timing cycle, the timing function will be canceled.
After the adjustment, the timing function will start again with the previously entered value.

• The process cycle time value can be cl1anged during operation. If tile new setup time value is lower
than the previously stored value, the heating system will be shut down immediately and the alarm
buzzer will sound four times.

• If the new setup time value is higher than the previously stored value, the heating process will
continue until the total operating time reaches the new setup time. At this point the heating system
will be shut down and the alarm buzzer will sound four times.

• If you lower the temperature setpoint to a value that is greater than the difference of the actual
temperature minus the AL parameter controller setting, the alarm buzzer will sound continuously until
this difference does not exist. Example: While the oven is operating at the temperature setpoint of
260 ° C and you lower it to 100 ° C, the difference of 160 ° C is greater than the AL parameter setting
of xx° C.

8.5 Controller Configuration

The pre-programmed controller configuration for

your chamber is documented in the Test Report,
which is located in the Supplemental Instructions
Section. Refer to the controller's user manual for
more information.

important! The configuration set-up is mainly

provided for your reference. Not all of the
parameters shovvn apply to your chamber. Changes
to some of the set-up parameters may drastically
affect your chamber performance and void your
warranty. Contact the TPS Service Dept. before
attempting any changes.

REAR OF CONTROL PANEL

Model LO-xx Series Laboratory Oven Page 28

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9.0 EXTERNAL PROCESS CYCLE TIMER

The Xinling Electrical Company, Ltd. Model DH48S-2Z Timer is provided for extended process cycle timing
1,vith the Model LO-xx-E series of ovens. These ovens employ the Model YLD-2000 Temperature Controller
which has a process cycle timing function range of o to 999 minutes (16.65 hours).

The DH48S-2Z permits up to 99 hours, 99 minutes to be programmed using plus/ minus pushbuttons with
dial type indicators. A red four digit display is employed to indicate elapsed time (count-up mode).

Once the timer is set, timing will begin when oven temperature reaches
the process setpoint in the YLD-2000 Temperature Controller. This is
achieved with the high alarm limit output of the YLD-2000, which
closes to trigger the timer. Process cycle (soak) time will count up in
the timer's red display.

VIJ"hen the process cycle time is reached, the timer output contacts wiii
11
--
open to remove power from the heaters.
---
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I
PROCESS CYCLE TIMER

1110.0 OVERTEMPERATURE PROTECTION

Overtemperature protection is provided with an OTP Controller that features a 3 digit pushbutton dial for
entry of the high temperature limit. A 100 Ohm Platinum RTD is used to measure temperature, which is
placed in the discharge air on the right side duct wall.

The output of the OTP is used to energize the Heat Enable Contactor J1 during normal conditions. Contacts
of J1 will close to enable the Solid State Heat Relay to supply and control power to the heater.

The OTP Controller will disable power to the heater by deenergizing J1 when an overtemperature condition
is detected. It will also cause the alarm buzzer to sound. The high limit setpoint should be approximately 10°
C (18° F) above the rated operating temperature of the oven.

Alarm Buzzer

OVERTEMPERATURE CONTROLLER BOARD

Model LO-xx Series Laboratory Oven Page 29

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1
1 11.0 PROFILING TEMPERATURE CONTROLLER (Optional) I
11.1 Overview

For Model LO-xx-P ovens, temperature conditions are controlled by a Shimaden Company, Ltd. Model FP93
Program Controller. The FP93 is a profiling type single channel controller that features up to 40 step
programming, with 3 Event Outputs, 4 Digital Inputs, and 4 Digital Outputs. Data communications is optional
using Type RS-232C or RS-485. A 100 Ohm Platinum RTD is used to measure temperature.

Follow the directions in the controller's Operation Manual (attached separately) for complete setup and
operation.

OVER TEMP

'••··
ALM

HEAT

SHIMADEN FP93 CONTROLLER

11.2 FP93 Quick Program Setup Guide

IMPORTANT NOTE: This procedure references the FP93 Instruction Manual for the 'Figures' listed.

1. Tum on power to the oven.

2. Wait several seconds for the controller to go through its boot-up routine.

The ambient temperature will be shown in the upper display and the current setpoint in the lower
display.

3. Press the GRP (Group) key once. Display will change to the Initial Screen (pattern 1) ("PRoG 1 / SEt''),
(Fig.1-0, pg. 15).

4. Press the @ (Scroll) key once. Display will change to the Start SV Setting Screen (Fig. 1-1, pg. 15).
Enter program starting setpoint using Up/Down Arrow keys, and press Enter key to confirm. (Normally
set around ambient room temperature).

5. Press the@ (Scroll) key once. Display will change to the End Step Setting Screen (Fig. 1-2, pg. 15).
Enter the total number of steps in Profile Ramp, Soak, Cooldown, etc., using Up/Down Arrow keys, and
press Enter key to confirm.

Model LO-xx Series Laboratory Oven Page 30

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5.1 Press the C.<?>

(Scroll) key 3 times. Display will change to the Number of Program Executions
�etting_Screen (Fig. 1-14, pg. 16). Using Up/Down Arrow keys, set PIO Loop Number (Normally
1), and press Enter key to confirm.

5.2 Press the @) (Scroll) key 2 times. Display will change to the Guarantee Soak Zone Setting
Screen (Fig. 1-16, pg. 17). This is a Guaranteed Soak option. If customer profile requires a ramp
rate faster than what the oven can physically heat up to, the customer can enter a value in
degrees using the Up/Down Arrow keys, and press Enter key to confirm.

The controller, while in 'program', will 'Wait' until actual unit temperature is within setting in
degrees before moving to the next step of profile. The default setting is OFF.

6. Press STEP key once. Display will change to the Step SV Setting Screen (Fig. 2-1, pg. 17). Enter the
first step temperature of program using Up/Down Arrow keys, and press Enter to confirm.

7. Press the (Q) (Scroll) key once. Display will change to the Step Time Setting Screen (Fig. 2-2, pg.
17). Enter step time (hours and minutes) using Up/Down Arrow keys, and press Enter to confirm.

8. Press the© (Scroll) key once. Display wi!! change to the PIO No. Setting Screen (Fig. 2-3, pg. 17).
Enter number of Pl D Loops to be used (Normally 1) using Up/Down Arrow keys, and press Enter to
confirm.

9. Press the (Q) (Scroll) key once. Display is returned the Step SV Setting Screen (Fig. 2-1, pg. 17).
Press STEP key once to program Step 2 of profile. Repeat steps 6 thru 9 for all Steps in customer
profile

10. Press GRP (Group) key 2 times. Display should change to the Initial Screen (Fig. 3-0, pg. 17). Press
the (c3) (Scroll) key once. Display should change to the FIX Mode ON/OFF Setting Screen (Fig. 3-1,
pg. 17). Using Up/ Down Arrow keys, turn parameter OFF. Press Enter key to confirm.

11. Press GRP (Group) key 4 times. Display should return to Basic Screen (Fig. 0-0, pg. 15) with ambient
temperature shown in upper display and program start temperature in lower display.

12. To start profile press and hold the Run/Reset key for 3 seconds.

12.0 OPTIONAL EQUIPMENT & FEATURES

The following optional equipment and features may be included.

• Emergency Stop Pushbutton, Y090-A Series: Pull and rotate type with red and green optional colors.
• Large Alarm Light
" Stack Light, ST458 Series
• Profiling Type Controller Model FP93, Shimaden Company, Ltd.

Model LO-xx Series Laboratory Oven Page 31

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13.0 SEQUENCE OF OPERATION

WARNING! This equipment is not designed for use with volatile or explosive materials
unless it is equipped with the solvent venting package and specifically stated in your oven
specifications. Loading of such materials may result in explosion or fire.

Important! Make sure you have read (and understand) this entire manual along with all vendor manuals
enclosed before beginning oven operation.

Important! Make sure the Installation Instructions have been properly followed before operating
the oven. All switches should be in the OFF position before starting the sequence below.

1. Make sure the power supply cord is securely inserted into the proper receptacle and tum on the main
power source to the chamber. Switch the Main Circuit Breaker on the right side of the oven to the ON
position.

The main controller will go through a short boot-up procedure and illuminate the top red LED display
and the bottom green LED display. The RUN light on the control panel will also illuminate. The
circulation blower wi!! start.

2. Load product and make sure the door is securely closed.

3. Enter a process temperature setpoint into the main controller.

4. Select the high limit temperature setpoint with the overtemperature controller using the 3-digit
pushbutton controlier setting. The high limit setpoint should be approximately iO" C (i8 ° F) above the
rated operating temperature of the oven.

5. Enter your process cycle time into the DH48S-2Z Timer.

6. Check for the operation of any other optional equipment in the corresponding Options Section.

7. Press the Heat Switch on the control panel to the closed position.

Heating of the oven will begin. When the process temperature setpoint is reached in the YLD-2000
Temperature Controller, the controller's high alarm limit output will close to trigger the DH48S-2Z
Timer. Timing will begin with the timer in a count-up sequence.

Once the timed setpoint is reached, timer output contacts wi!! open to remove power from the heaters.

8. After your process cycle is complete, take appropriate precautions when removing product from the
oven. Do not open oven doors until oven temperature drops below 200 ° F (93 ° C), when applicable.
Human exposure to temperature extremes can cause injury.

Always cool the oven down below 167 ° F (75 ° C) before shutting it down. Otherwise, damage to the
circulation motor shaft bearings wili resuit.

Important Note! For complete programming and/or operating instructions on any of the controllers,
electrical/ mechanical components, or optional equipment, you must refer to their operating manuals
included with your Tenney Environmental manual.

ivlodei LO-xx Series Laboratory Oven Page 32

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.0 PREVENTATIVE MAINTENANCE & SERVICE

Warning! Only qualified maintenance and electrical personnel should be allowed to perform any
maintenance or repair vvork.

Warning! Turn the main power disconnect switch on the front of the oven to the OFF position and
proceed with your company's Lock-Out / Tag-Out procedure before servicing or cleaning.
The oven's main power disconnect switch is a lockable type.

Frequency of preventative maintenance operations depends upon your particular process application and
frequency of use. Because of this, a hard and fast schedule of maintenance operations is difficult to present.
A set of guidelines suitable for an "average use" oven might not be sufficient for an oven with a high
frequency use. Therefore, the preventative maintenance measures given here are offered as a guide,
allowing you to arrange your own program .

.A. Preventative Maintenance Schedule/ Log chart is provided at the end of this section. The suggested
inspection/ service dates given are for average use.

14.1 Maintenance Checks / Procedures

All interlocks and safety features should be tested periodically for proper operation.

Door Gasket:

Inspect your door gasket(s) for wear (cracks, tears, etc.). lnsoection Period: 3 Months

Door Gasket Replacement:

The door gasket is held in place by compression between the oven frame and the oven liner. Therefore, the
screws surrounding the door frame must all be removed, but only 3 at a time to avoid shifting the entire liner.

Siarting ai the gasket joint iocated at the bottom of the door frame, first remove the screw iocated behind the
gasket (Step 1 ). Then remove the next two screws working to the right as shown (Steps 3 & 4) .

., STEP 2
STEP 1

Model LO-xx Series Laboratory Oven Page 33

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STEP3
\
Using a flat blade screwdriver, pry the inner shell of the oven upward away from the frame as shown in Step
5 to release the gasket. Pull out the gasket as shown in Step6, working to the right.

As you pull out the old gasket, start installing the new gasket. Re-install the first3 screws you removed.

Continue to work counterclockwise around the door frame removing3 screws at a time, pulling out the old
gasket while installing the new gasket behind it. Remember to re-install each set of3 screws before moving
on to each new section. Otherwise alignment problems may develop between the liner and frame.

STEP 5 STEP6

Door Sealing Quality:

Check that the door seals evenly around its perimeter to negate heat loss. Adjust door latches if necessary.
Inspection Period: 3 Months

Model LO-xx Series Laboratory Oven Page34

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Motors / Motor Shaft Seals:

&. Remove All Power From Chamber!

Note: The motors are permanently sealed ball bearing types and require no lubrication.

Check motor shaft seals for deterioration. Inspection Period: 6 Months

Condition�r Blower Whee!:

&,. Remove All Power From Chamber!

Inspect and clean the conditioner blower wheel in the conditioning plenum. Make sure the blower wheel
spins freely and that it is tight on its shafts.
Inspection Period: 6 Months

General Electrical Connections:

&,. Remove All Power From Chamber!

Inspect inside the control panel and the machinery compartment for loose electrical connections, frayed
wires, loose components, or other potential problems.
Inspection Period: 6 Months

Electric Heaters:

&. Remove All Power From Chamber!

Inspect the electric heaters inside the chamber conditioning plenum and look for defects.
Inspection Period: 6 Months

Main Controller Calibration:

The main temperature controller should be checked for temperature indicating accuracy, and for the proper
activation of limit or alarm outputs (when provided). Please reference the controller user manual for more
information.
Inspection Period: 1 Year

Limit Controller Alarm Circuitry:

The Temperature Limit Controller should be checked for indicating accuracy and for proper activation of limit
or alarm outputs. Please reference the controller user manual for more information.
Inspection Period: 6 Months

Model LO-xx Series Laboratory Oven Page 35

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Electrical Supply Voltage:

Measure the power supply voltage to your oven and verify that it is within the ±10% tolerance established for
the nameplate rating of your oven.
Inspection Period: 6 Months

Cleaning:

Important! NEVER use a cleaning solution that contains chloride or flouride ions. These ions are
aggressive and highly corrosive, and will attack stainless steel.

• Thoroughly wash all surfaces with an appropriate cleaning solution.

■ Thoroughly rinse all surfaces.
• When cleaning the conditioning plenum, proper precaution should be taken not to spray beyond the
blower outlet.

Model LO-xx Series Laboratory Oven Page 36

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14.2 Preventative Maintenance Schedule/ Log

Important: For each of the items to be inspected, refer to item description sections for details on
maintenance and service.

PREVENTATIVE MAINTENANCE SCHEDULE / LOG

Inspection Period Actual Date Actual Date Actual Date Actual Date
ITEM TO BE
inspected i inspected I inspected I inspected i
INSPECTED Serviced Serviced Serviced Serviced
Door Gasket 3 Months
Door Sealing Quality 3 Months
Motor Shaft Seal 6 Months
Conditioner Blower 6 Months
Wheel
General Electrical 6 Months
Connections
Electrical Heaters 6 Months
Main Temperature 1 Year
Controller Calibration
Limit Controller Alarm 6 Months
� Operation
Electrical Supply 6 Months
Voltage

Model LO-xx Series Laboratory Oven Page 37

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14.3 Troubleshooting Guide

This section does not propose to be a complete and comprehensive troubleshooting guide for the
serviceman. However, it attempts to help you locate the causes of possible troubles so that you can make
simple repairs or adjustments yourself. The information here should also help you in localizing trouble so that
you can better describe the malfunction when contacting the TPS Ser.:ice Department. Refer to the
appropriate electrical drawing when using these troubleshooting suggestions.

TROUBLESHOOTING GUIDE
Problem Possible Cause Action
Control Power Is Dead Power supply plug not properly Check plug connection and verify
plugged in. correct power input.
Oven main circuit breaker turned Turn circuit breaker ON
OFF.
Internal fuse FU1 blown - 115 V Replace
System
Internal fuse FU1/FU2 blown - Replace
230 V System
Circulation blower doesn't Motor shaft frozen Verify - Rotate by hand carefully -
start Contact TPS Service
Defective motor Verify - Fee! for heat and measure
current - Contact TPS Service
Oven not heating or Overtemperature Controller tripped Check high limit setting
heating slowly
Controller heat output failing to close Verify - Contact TPS Service
Solid State Relay SSR failed open Replace
Heater elements burned out, or open Replace
Open temperature sensor Replace
Heat Switch not turned ON Turn Heat Switch ON
Excessive heat SSR failed in conducting state (usual Replace
fail11r<> morl<>)

Heat output failing to open Verify - Contact TPS Service

Short circuited temperature sensor Replace

Model LO-xx Series Laboratory Oven Page 38

========================== BLUE M

SUPPLEMENTAL INSTRUCTIONS

Model LO-xx Series Laboratory Oven Page 39

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Rated Current: 20A

(Over load, Leakage and Short-Circuit Protect ion)

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Current Rate: 13.04A

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Controller Wiring: lmm 2 (Copper Core)
SSR Wiring: 2 Cores of 0. 3mm 2 (Shield Wire)
Ground Wiring: 4mm 2 (Green & Yellow)
Panel Wiring: 0.3mm2(Copper Core) SIZE
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