Guspro BB-8416884 Manual

2017_E_TYPE-HL.doc 24-Oct-2017
GUSPRO INC.
CHATHAM, ONTARIO
CANADA
HEAT CLEANING OVENS
OPERATIONS & MAINTENANCE MANUAL
OVENS WITH E BURNERS

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MODEL NUMBER: ____________________
SERIAL #: _________________
MANUFACTURED BY GUSPRO INC.
566 RIVERVIEW DRIVE
CHATHAM, ONTARIO
N7M 5J6
CANADA
TELEPHONE: [phone]
FAX: [phone]
Website: www.guspro.com
Email: [email protected]
C-18004
BB-8416884

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NOTICE
Both the main gas valve and the electric supply should be clearly marked or tagged.
INSTALLATION
This unit shall be installed in accordance with the National Fuel Gas Code ANSI Z223.1,
The National Gas Installation Code CAN/CGA B149.1 or the Propane Installation Code
CAN/CGA-B 149.2, as applicable.
If applicable, the vent line from the gas appliance pressure regulator shall be installed to
the outdoors in accordance with local codes or, in the absence of local codes, with the
National Fuel Gas Code, ANSI Z223.1, Natural gas Installation Code, CAN/CGA-B149.1,
or the Propane Installation Code, CAN/CGA-B149.2, as applicable.
The unit and its individual shut off valves must be disconnected from the gas supply piping
system during any pressure testing of that system at test pressures in excess of 1/2 PSI (3.45
Kpa).
The unit when installed shall be electrically connected and grounded in accordance with
local codes, or in the absence of local codes, with the National Electrical Code,
ANSI/NFPA70, or the Canadian Electrical Code, CSAC22.2, as applicable.
AFTER INSTALLATION
After installation, be sure to maintain adequate combustion and ventilation air. Do not
allow materials or articles to be stacked or piled near or against the oven or burners so as
to block or inhibit air flow. In the case of a through the wall installation, do not allow snow
or ice to build up around the burner covers or the oven relief lid.
NOTICE
The oven manual should be retained for future use. A “C” sized electrical diagram is
contained in the manual. An electrical diagram is placed in the electrical panel.
•The Process Chamber referred to in this manual is also known as the Primary
Chamber.
•The Oxidizer Chamber referred to in this manual is also known as the Afterburner
or Secondary Chamber.
It is recommended that the operator reads Sections 4.2-4.4 prior to powering up the unit!!

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NOTICE - The purchaser shall post in a prominent location, instructions to
be followed in the event the user smells gas.
1) Turn OFF the main fuel supply valve. This will lockout the burners.
2) If the oven is in use, do not shut the electrical power off. This will allow the OTS to
function and prevent any runaway situations.
3) Ventilate area by opening windows and doors (if possible).
4) Contact your local supplier or licensed installer.
5) Notify Guspro Inc.
FOR YOUR SAFETY
Do not store or use gasoline or other flammable
vapours or liquids in the vicinity of this or any
other appliance.
WARNING: Improper installation, adjustment,
alterations, service or maintenance can cause
property damage, injury or death. Read the
installation, operating and maintenance
instructions thoroughly before installing or
servicing this equipment.

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TABLE OF CONTENTS Page
1.0 - GUSPRO HEAT CLEANING OVEN..............................................................1
1.1 Introduction....................................................................................................................1
1.2 Design ............................................................................................................................3
1.2.1 Introduction..............................................................................................................3
1.2.2 Specifications...........................................................................................................3
1.3 Burners...........................................................................................................................5
1.4 Materials of Construction ..............................................................................................5
1.5 Instrumentation and Control..........................................................................................5
1.6 Installation......................................................................................................................6
1.7 Air Permits.....................................................................................................................7
1.8 Local Codes ...................................................................................................................7
1.9 Safety Standards.............................................................................................................8
1.10 Warranty ........................................................................................................................8
2.0 - CONTROL AND SAFETY CONFIGURATION ............................................9
2.1 Introduction....................................................................................................................9
2.2 Main Control Panel........................................................................................................9
2.2.1 Temperature Controllers........................................................................................11
2.2.2 Cycle Timer ...........................................................................................................11
2.2.3 Fault Light..............................................................................................................11
2.2.4 Oxidizer or Process Chamber Faults......................................................................11
2.2.5 Reset Faults............................................................................................................12
2.2.6 OTS Test................................................................................................................12
2.2.7 Stack High Limit Controller [ETC-S]....................................................................12
2.3 Gas Burners..................................................................................................................13
2.3.1 Technical Description............................................................................................13
2.3.2 Process Chamber Burner Configuration...............................................................14
2.3.3 Oxidizer Chamber Burner Configuration .............................................................14
2.4 Flame Safety Controls..................................................................................................15
2.5 Optional Controls.........................................................................................................15
2.6 Chart Recorder.............................................................................................................15
2.7 Core Temperature Controller.......................................................................................15
3.0 - INSTALLATION............................................................................................16
3.1 Permits .........................................................................................................................16
3.2 Purchaser's Requirements Prior to Installation............................................................16
3.3 Electrical Service.........................................................................................................17
3.3.1 Standard Ovens......................................................................................................17
3.3.2 Ovens With Multi-Burner Chambers....................................................................17
3.3.3 Ovens With Circulating Blowers...........................................................................17
3.4 Fuel Supply..................................................................................................................18
3.4.1 Natural Gas Service ...............................................................................................18
3.4.2 Liquefied Propane Gas Service.............................................................................19
3.4.3 Oil Service .............................................................................................................19

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3.5 Water Supply ...............................................................................................................19
3.6 Receiving .....................................................................................................................20
3.7 Storage .........................................................................................................................21
3.8 Installation....................................................................................................................21
3.8.1 Introduction............................................................................................................21
3.8.2 Stack Installation....................................................................................................21
3.8.3 Procedure ...............................................................................................................22
4.0 - OPERATION ..................................................................................................25
4.1 Introduction..................................................................................................................25
4.1.1 Process Chamber....................................................................................................25
4.1.2 High Combustible Loads .......................................................................................25
4.1.3 Oxidizer Chamber..................................................................................................26
4.2 System Checks Prior To Start-Up...............................................................................26
4.3 Initial Start-Up.............................................................................................................27
4.4 Curing Procedure .........................................................................................................30
4.5 Operating Sequence .....................................................................................................31
4.6 Operating Procedure ....................................................................................................34
5.0 - PRECAUTIONS..............................................................................................36
5.1 Loading........................................................................................................................36
5.2 Operation......................................................................................................................36
5.3 Parts..............................................................................................................................37
5.4 Emissions Control........................................................................................................37
6.0 - GENERAL MAINTENANCE........................................................................38
6.1 Introduction..................................................................................................................38
6.2 Gas Burners..................................................................................................................38
6.2.1 Electrode Assembly ...............................................................................................38
6.2.2 Electrode Gap.........................................................................................................38
6.2.3 U.V. Flame Scanner...............................................................................................39
6.2.4 Blower....................................................................................................................39
6.2.5 Blower Motor.........................................................................................................39
6.2.6 Air Flow Switch.....................................................................................................39
6.2.8 Automatic Gas Valve.............................................................................................40
6.2.9 Air Damper ............................................................................................................40
6.3 Door Gaskets and Seals ...............................................................................................40
6.5 Firebrick Soaps ............................................................................................................41
6.6 Lubrication of Loading Cart Wheels ...........................................................................41
6.7 Ash Handling and Disposal .........................................................................................42
6.8 Maintenance Tips.........................................................................................................42
7.0 - OVER TEMPERATURE SUPPRESSION SYSTEM....................................44
7.1 Introduction..................................................................................................................44
7.2 Operation......................................................................................................................44
7.3 Testing..........................................................................................................................45
7.4 Instrument Synchronization.........................................................................................45

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7.5 Adjustments .................................................................................................................46
7.5.1 For Normal Loads..................................................................................................46
8.0 - GENERAL TROUBLE-SHOOTING.............................................................46
8.1 Oven Will Not Start.....................................................................................................46
8.2 Electrical System Check ..............................................................................................47
8.3 Start Oven ....................................................................................................................47
8.4 Process Burner Fails To Purge.....................................................................................47
8.5 Oxidizer Burner Motor Fails To Start..........................................................................48
8.6 Oxidizer Burner Motor Starts But Flame Does Not Ignite..........................................48
8.7 Electrode Arcs But Pilot Does Not Ignite....................................................................48
8.8 Pilot Fires But Will Not Stay Lit .................................................................................49
8.9 Pilot Lights But Main Burner Will Not Fire................................................................49
8.10 Process Burner Motor Runs But The Flame Does Not Ignite .....................................49
8.11 Burner Cycles...............................................................................................................50
9.0 - E-BURNER.....................................................................................................50
9.1 Introduction..................................................................................................................50
9.2 Design ..........................................................................................................................50
9.3 Ignition Sequence.........................................................................................................51
9.4 Maintenance.................................................................................................................51
9.5 Adjustments .................................................................................................................51
9.6 Trouble Shooting .........................................................................................................51
Appendix
Start-up Settings for Omron Temperature Controllers
Omron Temperature Controller Setup
Changing Set Point on Stack High Temperature Safety Controller
Omron Programmable Controller
Manufacturers Literature
Valve Train
Wiring Ladder Diagram

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LIST OF TABLES
Table Page
1.1 Summary of Loads That Can Be Processed ..............................................................2
1.2 Summary of Loads That Cannot Be Processed .........................................................3
1.3 Oven Design Information..........................................................................................4
1.4 Summary of Oxidizer Combustible Ratings..............................................................4
3.1 Minimum Suggested Stack Clearances ...................................................................16
4.1 Firing Sequence .......................................................................................................33
6.1 Summary of Maintenance Tips................................................................................44
9.1 E-Burner Factory Air and Gas Flow Settings..........................................................55
9.2 E-Burner Trouble Shooting Tips.............................................................................55
LIST OF FIGURES
Figure Page
2.1 Main Control Panel with Electric Door Lock Option..............................................10
3.1 Assembly Instructions for Bolt-On Oxidizers.........................................................23
3.2 Stack Assembly for Ovens With Heavy Duty Oxidizers.........................................24
4.1 Placement of Fire-brick Soaps.................................................................................30
9.1 Schematic of E-Burner ............................................................................................53
9.2 E-Burner Sequence of Operation.............................................................................54

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1.0 - GUSPRO HEAT CLEANING OVEN
1.1 Introduction
The Guspro heat-cleaning oven is state-of-the-art technology that enables heat cleaning
of parts coated with grease, oil, paint, carbon, plastics and water scale. Materials that can be heat
cleaned include steel, aluminum, and cast iron.
Applications include:
•Paint or powder coating line fixtures such as hooks, trees, trays and baskets.
•Paint, grease and combustion contaminated automotive engine blocks, heads, cranks,
camshafts, brake parts, transmissions, power boosters and water pumps.
•Epoxy and varnish coated components such as electrical motor armatures, stators and
transformer cores.
•Reclamation of manufactured parts with reject or service damaged coatings.
•Precious metal recovery in photographic film processing, transistors, printed circuit
boards and personal computer board salvage.
•Polymer coated tooling screws, breaker plates, dies and screens.
Parts are protected from distortion by precise temperature controls and backup control and safety
systems. Further, the heat cleaning process has the following advantages:
•Controlled heat cleaning cycles coupled with an absence of direct flame on the parts
prevents distortion and warpage.
•Operations are improved with safe, fast and efficient cleaning.
•Automatic operation ensures minimal operator supervision.
•Automatic over-temperature suppression system automatically injects water mist in case
of a sudden temperature rise, ensuring that high tolerance steel parts, and even most
aluminum parts are safely heat cleaned.
•The typical cycle time is 1.5 - 4.0 hours. Short cleaning cycles limit the exposure time of
parts to temperature, cut down fuel cost and provide fast turn around.
•Models are designed for at least two or three heat cleaning cycles per day, which is the
key to high efficiency and productivity.
•A platform cart is supplied. This ensures both a fast manual or optional lift truck loading
operation.

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•Low labour cost associated with automatic operation plus low fuel usage per cycle
ensures significant annual savings.
•Eliminates use of expensive cleaning chemicals, waste slurry disposal costs and
associated liability.
The burners on the Guspro heat cleaning ovens are sized to ensure that heavy loads are
brought to processing temperature fast. Depending on the oven model and site-specific loads,
the powerful standard refractory-lined oxidizer can process up to 70 pounds of combustibles per
hour once operating temperatures are reached. This amount may vary depending on the BTU
value of the combustible product being processed.
Note: The combustible load and cycle times are limited to the capacity of a given model’s
thermal oxidizer capacity. Extra heavy-duty or 100 pound afterburners are also
available as an option.
Heat passes from underneath the cart rack to heat the parts. This enhances temperature
uniformity in the process chamber while reducing energy consumption and cycle times.
The dry dust generated by the heat cleaning process meets stringent EPAsolid waste
disposal standards (RCRA/SARA) and is easy to dispose of. A simple ash analysis on the dust
residue will determine if the dust requires special handling.
Tables 1.1 and 1.2 offer a summary of the type of automotive or industrial parts that can
and cannot be processed in the Oven.
Table 1.1
Summary of Loads that CAN be processed in the Oven
Parts made of:
•Aluminum
Note: It may be necessary to use slower heat up and cool down rates on some
parts to prevent thermal distortion.
•Iron
•Steel
Coatings made of:
•Straight chain hydrocarbons (glues, adhesives, polymers).
•Epoxy, polyester, powder and wet paints and coatings.

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Table 1.2
Summary of Loads that CAN NOT be processed in the Oven
Parts Made of:
•Metals that melt under 900
o
F (e.g. Zinc and its alloys)
•Magnesium which burns violently when ignited
•Alloy aluminum with a low melting point.
Coatings Made of:
Chlorinated compounds (PVC’s) - (Depends on concentration)
Fluorinated compounds (Teflon)
Note: Guspro Inc. should be consulted before processing loads
1.2 Design
1.2.1 Introduction
Guspro heat cleaning ovens are of the two stage controlled air design. The first stage is
called the Process Chamber, while the second stage is called the Oxidizer Chamber.
A separate burner(s) heats each chamber. The process chamber burner(s) is fires into an
internal or external firebox. The oxidizer burner(s) fire directly into a chamber located on top of
the oven. A temperature control system oversees the operation of both burners. Flue gases are
vented to the atmosphere by a self-supporting refractory lined stack.
1.2.2 Specifications
Table 1.3 lists the usable dimensions, burner models and ratings on standard Guspro
ovens. Guspro heat cleaning ovens are designed with larger oxidizer capacities to quickly and
efficiently burn off volatile particles from the process chamber, while complying with
environmental regulations. A summary of Oxidizer combustible ratings for standard Guspro
oven models is listed in Table 1.4.

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Table 1.3
Oven Design Information
Model
Actual Inside Dim.
(Inches)
Design
Load
Burner Rating
(BTU/hr)
Burner Model
W
D
H
LBS
PROCESS
OXIDIZER
PROCESS
OXIDIZER
GO-484072
54
48
99
3,000
500,000
750,000
E3
E4
GO-484084
54
48
111
3,000
500,000
750,000
E3
E4
GO-606060
66
68
87
4,000
750,000
750,000
E4
E4
GO-607272
66
80
99
4,000
750,000
750,000
E4
E4
GO-607284
66
80
111
4,000
750,000
750,000
E4
E4
GO-727272
78
80
99
5,000
1,000,000
1,000,000
E5
E5
GO-727284
78
80
111
5,000
1,000,000
1,000,000
E5
E5
GO-729672
78
104
99
6,000
1,000,000
1,000,000
E5
E5
GO-7212072
78
128
99
6,000
1,000,000
1,000,000
E5
E5
GO-7212096
78
128
123
6,000
1,000,000
1,000,000
E5
E5
GO-9612096
102
128
123
6,000
1,000,000
1,000,000
E5
E5
Table 1.4
Summary of Oxidizer Combustible Ratings
Oven Model
Oxidizer Rating
(lbs/hr)
GO-484072 to GO-484084
40
GO-606060 to GO-607284
50
GO-727272 to GO-7212096
55
GO-9612096
70
Special models and standard models (GO-
484072 and up) are available with larger
capacity oxidizers.
100
Note: Certain site specific applications may need special custom designed ovens or larger
capacity oxidizer chambers.

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1.3 Burners
Gas burners are equipped with approved ignition and flame safety systems. The burners
may be used with Liquefied Propane Gas (LPG) by a modification to the orifice. Fuel oil fired
ovens are available upon request.
1.4 Materials of Construction
All Guspro ovens are fabricated with hot rolled 7-gauge steel floors and 12-gauge steel
wall and roof backed by a framework of 3" channel, tube and flat iron. All steel work is finished
with two coats of 400 oF heat resistant paint on the outside, while the insides of the steel walls
are coated with chemical resistant Mastic.
The inside of oven walls and doors are insulated with three layers of insulation. The
innermost layer consists of 2" mineral fiber rock board, which is rated at 1200 oF. The next two
layers are made of 1/2" ceramic fiber board, which is rated at 2300 oF.
The wall insulation is anchored to the steel skin with stainless steel pins and clips.
The process chamber doors are equipped with a high temperature ceramic tadpole gasket,
hinges and cam type safety locking latches.
The floors are poured with 3" thick castable refractory. Cart tracks are embedded in the
refractory floor. Removable external cart track extensions are included.
Note: The cart track extensions may be left in place at all times. They do not have to be
removed to close the oven door.
The self-supporting stack is fully lined with a 2300 oF castable refractory. It is designed
to provide natural draft operation, and does not require either an exhaust blower or induced draft
fan.
1.5 Instrumentation and Control
A microprocessor - controlled operating system coordinates the functions of the process
burner, the oxidizer, and the Over Temperature Suppression (OTS) System during a heat
cleaning cycle. After the heat cleaning cycle, the system shuts down to cool.
All oven models have an OTS system included. The ovens come with a separate process
chamber excess temperature backup sensor. This will activate the OTS system by water mist

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injection in case the oven operational temperatures exceed set parameters.
The process burner is controlled by a programmable digital temperature controller, which
can store up to four programs patterns with 16 steps of ramp and soaks. The process burner uses
of a High/Low gas valve which will cycle between high and low fire to maintain set point. This
enables heat cleaning temperature control and fuel efficiency.
An independent digital temperature controller controls the oxidizer system. The oxidizer
temperature controller senses the stack temperature and controls oxidizer temperatures through
the use of a High/Low gas valve control system.
The use of a High/Low gas valve allows for a fast response oxidizer system (FRS). This
system gets the oxidizer to set point temperature quickly and then cycles to low fire to maintain
set point.
The oxidizer chamber also includes an excess airport for excess air combustion of
combustibles. The oxidizer chamber is designed to operate at a set-point temperature of between
1400 oF (760 0C) to 1600 oF (870 0C).
Note: The oxidizer set-point temperature is dependent on regulations set forth by the local air
pollution control authority. This value typically varies between 1400 oF and 1600 oF
over North America.
The oxidizer chamber is designed for a total residence time of 0.50 to 1.00 second
through the refractory lined mixing chamber and stack volume up to the thermocouple port.
Guspro ovens are equipped with a manual reset Excess Temperature Controller (ETC-S)
located in the panel. The ETC-S is used for safety shutdown if the flue gas temperature exceeds
a pre-set limit (1850 oF).
Operating and safety controls required by most provinces, states and local codes are
standard equipment. Special requirements such as Factory Mutual (FM)standards and Industrial
Risk Insurers (IRI)standards are available at extra cost where required by the purchaser or the
insurance underwriter.
1.6 Installation
The Guspro heat-cleaning oven is completely piped, wired and tested at the factory to
reduce installation costs to a minimum.

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1.7 Air Permits
The Guspro heat-cleaning oven is state-of-the-art technology that enables safe and
economical cleaning of automotive and industrial parts, fixtures, paint hooks and racks.
However, operation of the oven will require an air permit from the local Air Pollution Control
Authority.
The process of securing a permit to construct or install process equipment like the Guspro
oven usually requires that the purchaser fill out the applicable local forms and provide
information about the process, the equipment and the location where the equipment is to be used.
Upon request, Guspro Inc. will furnish an appropriate Air Permit support package that
can be used as an application package for submittal to the local authorities. The package
generally requires completion of the Air Quality portions of local forms. Guspro Inc. will supply
supporting technical documentation such as:
•Expected stack emissions.
•Combustion gas flow rates.
•Operating temperatures.
•Heat and mass balances.
•Residence time calculations.
The purchaser must supply the following information:
•Local application forms.
•Owner of the equipment.
•Persons responsible.
•Physical locations (including plot plans where required)
•Any other information required
The purchaser is ultimately responsible for fully completing, signing and submitting the
completed forms along with any necessary filing fees.
1.8 Local Codes
The Guspro Heat Cleaning Oven is designed to comply with most building and safety
codes. If any modifications are requested for compliance with other codes or regulations,
Guspro Inc. will review the requirements. Guspro Inc will then provide a cost estimate for
additional work required to meet these standards.

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1.9 Safety Standards
OSHA standards have not yet been released for this class of equipment. The installed
flame safety systems have a 4.0 second proof of ignition and a 0.8 second flameout response
time.
The Guspro safety systems meet current industry standards. The comprehensive features
of the Guspro safety system also ensure compliance with potential future standards.
1.10 Warranty
Guspro Inc. guarantees its equipment against defects in materials and workmanship,
when operated in accordance with standard operating instructions. The warranty is good for a
period of one year from date of shipment.
During this time period, defective parts will be replaced free of charge. Parts subject to
normal deterioration in use, such as spark electrodes, electric relays, panel light bulbs, gaskets,
fire-box tiles, etc. are not covered by this warranty.
Guspro Inc. makes no guarantee with respect to motors, controls, or other apparatus of
third party manufacture. The respective manufacturers usually guarantee these separately.
Guspro Inc. handles warranty exchange of such parts on behalf of the customer.
Guspro Inc. cannot accept responsibility for damage or injury resulting from oven
operation.
When operated in accordance with manufacturer's instructions, all Guspro ovens are
guaranteed to comply with the EPA particulate emission standard of 11 mg/Rm3(15 mg/dscm @
7% O2). Costs of source tests that may be required by local air pollution agencies are not
included in the base price of the unit.

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2.0 - CONTROL AND SAFETY CONFIGURATION
2.1 Introduction
Figure 2.1 displays a schematic of the main control panel.
2.2 Main Control Panel
The central control panel includes the following features:
•Two 1/8 DIN digital temperature controllers. One controller controls the burner(s) and
the temperature in the process chamber. The other controller controls the burner(s) and
the temperature in the oxidizer chamber via a High/Low fire - modulating actuator.
•A 1/16 DIN controller, which serves as an OTS High Temp controller.
•System-on and burner-on indicating lights.
•Relays and interconnects.
•ETC-S High Temperature. All ovens have a second 1/16 DIN digital temperature
controller. This Factory Mutual (FM) approved controller and is used for system lockout
if the temperature exceeds safety limits. This controller is also used in FM and Industrial
Risk Insurers (IRI)approved ovens.
A brief description of the functionality of each of these elements is presented in the
following sections.

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Figure 2.1 Main Control Panel with Electric Door Lock Option.

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2.2.1 Temperature Controllers
All ovens include digital temperature controllers actuated by a Type K thermocouple(s)
located in the process and oxidizer chambers. Instructions for setting up these controllers are
listed in the Appendix.
The controllers have an adjustable hysteresis for better control. This is set at the factory
and should not be adjusted unless Guspro has been consulted.
The oxidizer burner is fired automatically and remains on high fire until the
microprocessor set point is achieved. It will then cycle high/low fire to maintain the chamber
temperature. The process chamber burner does not fire until the oxidizer chamber reaches 1400
degrees Fahrenheit. The burner will then cycle high/low fire to maintain the process chamber
temperature.
Note: All ovens include an Over Temperature Suppression misting system in the process
chamber. The OTS system is activated by the process and oxidizer chamber
temperature controllers on the main panel.
2.2.2 Cycle Timer
All Guspro ovens are supplied with programmable ramp and soak microprocessor
controllers and may not have a separate cycle timer. The microprocessor controls the cycle time.
2.2.3 Fault Light
Red Fault lights located on the panel will indicate if either the process or oxidizer
chamber burners has faulted out and gone into Reset mode.
2.2.4 Oxidizer or Process Chamber Faults
If the oxidizer chamber faults out on start-up the process chamber burner will not ignite.
If the oxidizer chamber burner faults out during operation, the process chamber burner will shut
down. If the process chamber burner faults out, the oxidizer chamber burner will continue to
run. This ensures maximum environmental protection.

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2.2.5 Reset Faults
The Reset Faults push buttons are located on the flame safety modules. It is used to
resume normal operation after either a Process or Oxidizer fault has been corrected.
2.2.6 OTS Test
The OTS (Over Temperature Suppression) Test push-button is used to verify that the
OTS spray misting system is functioning properly. The OTS system is an integral and highly
important safety feature that ensures that a runaway combustion event that drives up either the
process chamber, the oxidizer chamber or the stack gas temperatures above acceptable limits
does not occur.
Before starting the processing cycle, the operator should open the process chamber doors
and push the OTS Test push-button. The operator should observe and ensure that the misting
nozzles are misting properly.
The OTS misting nozzle must mist to be effective. If the water is injected directly
without misting, it will not have any effect in suppressing over-temperature conditions in the
process chamber. This visual inspection will verify that the misting pin is not broken and that
the nozzles are not plugged. This inspection is very important and should be performed prior to
each start-up.
2.2.7 Stack High Limit Controller [ETC-S]
Some older model ovens include an Excess Temperature Control-System (ETC-S) switch
located in the stack base. If the temperature of the flue gas from the oxidizer chamber exceeds a
preset temperature, the ETC-S opens up the circuit to the system and shuts it down. However, in
1996 the system was changed and is now controlled from the panel with a manual reset
temperature controller. This controller is labeled ETC-S HIGH TEMP.
Note: The power supply to the water solenoid valve is not affected when the oven high
limit control system is tripped. The OTS water mist spray system can continue to operate to
lower the chamber temperature.