XLT Ovens XD 9006B Quick start guide

XLT Ovens
PO Box 9090
Wichita, Kansas 67277
US: 888-443-2751 FAX: [phone] INTL: 316-943-2751 WEB: www.xltovens.com
XLT Gas Oven & AVI Hood
Parts & Service Manual
XD 9006B
AEKESWEHE
01/26/2016
For use with the following XLT Gas Oven Versions:
Australia (AE) E
Korea (K) E
Standard (S) E
World (W) E
For use with the following AVI Gas Hood Versions:
Standard (S) E
World (W) E
This appliance is for professional use by qualified personnel. This appliance must be in-
stalled by qualified persons in accordance with the regulations in force. This appliance must be in-
stalled with sufficient ventilation to prevent the occurrence of unacceptable concentrations of sub-
stances harmful to health in the room in which it is installed. This appliance needs an unobstructed
flow of fresh air for satisfactory operation & must be installed in a suitably ventilated room in accor-
dance with current regulations. This appliance should be serviced by qualified personnel at least
every 12 months or sooner if heavy use is expected.
Electronic copies of this manual, Technical Specifications, Installation & Operation Manual, Architectural
Drawings, & a list of International Authorized Distributors are available at: www.xltovens.com
2000887
CAUTION
GAS40066
SAI Global

Technical Support US: 888-443-2751 Technical Support INTL: 316-943-2751
2 WARNING & SAFETY INFORMATION
 Post in a prominent location instructions to be followed in the event you smell gas. This infor-
mation can be obtained by consulting your local gas supplier.
 In the event a gas odor is detected, shut off the gas at the main shutoff valve immediately.
Contact your local Gas Company or supplier.
 Do not restrict the flow of combustion and/or ventilation air to the unit. Provide adequate
clearance for operating, cleaning, maintaining the unit & adequate clearance for operating the
gas shutoff valve when the unit is in the installed position.
 Keep the area free & clear of combustible material. DO NOT SPRAY AEROSOLS IN THE
VICINITY OF THIS APPLIANCE WHILE IT IS IN OPERATION.
 Ovens are certified for installation on combustible floors.
 Electrical schematics are located inside the control box of the oven & and in this manual. Dis-
connect input power to the unit before performing any maintenance.
 This unit requires a ventilation hood. The installation must conform to local codes.
 This unit may be operated with either natural gas or liquid petroleum fuel as designated on the
nameplate label located on the side of the unit.
 This unit must be operated by the same voltage, phase, & frequency of electrical power as des-
ignated on the nameplate label located on the side of the unit.
 Minimum clearances must be maintained from combustible & non-combustible construction
materials.
 Follow all local codes when installing this unit.
 Follow all local codes to electrically ground the unit.
 Appliance is not to be cleaned with high pressure water.
 XLT ovens are certified for use in stacks of up to three (3) units of XLT products. Integration
of other manufacturer’s products into an oven stack is not recommended, & voids any warran-
ties. XLT Ovens assumes no liability for mixed product applications.
 Failure to call XLT Customer Service at 1-888-443-2751 prior to contacting a repair company
voids any & all warranties.
 PLEASE RETAIN THIS MANUAL FOR FUTURE REFERENCE.
SAFETY DEPENDS ON YOU
Improper installation, adjustment, alteration, service or maintenance can
cause property damage, injury, or death. Read the installation, operating and
maintenance instructions thoroughly before installing, using, or servicing this
equipment.
XLT Ovens has spent millions of dollars designing and testing our products as well as de-
veloping Installation & Operation Manuals. These manuals are the most complete and easiest to
understand in the industry. However, they are worthless if they are not followed.
We have witnessed store operators and building owners lose many thousands of dollars in
lost revenue due to incorrect installations. We highly recommend you follow all instructions given
in this manual as well as follow best practices in plumbing, electrical, and HVAC building codes.
FOR YOUR SAFETY
Do not store or use gasoline or other flammable liquids or vapors in
the vicinity of this or any other appliance.
DANGER
DANGER

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Tips give a special instruction that can save time or provide other benefits while installing
or using the product. The tip calls attention to an idea that may not be obvious to first-time
users of the product.
NOTE
Notes indicates an area or subject of special merit, emphasizing either the product’s
capability or common errors in operation or maintenance.
WARNING & SAFETY INFORMATION
TIP
This symbol indicates high voltage. It calls your attention to items or operations
that could be dangerous to you & other persons operating this equipment. Read the
message & follow the instructions carefully.
HIGH
VOLTAGE
Indicates a potentially hazardous situation that, if not avoided, can result in serious
injury or death.
DANGER
Indicates a potentially hazardous situation, that if not avoided, can result in minor
to moderate injury or serious damage to the product. The situation described in the
CAUTION may, if not avoided, lead to serious results. Important safety measures
are described in CAUTION (as well as WARNING), so be sure to observe them.
CAUTION
Definitions & Symbols
A safety instruction (message) includes a “Safety Alert Symbol” & a signal word or phrase
such as DANGER, WARNING or CAUTION. Each signal word has the following meaning:
WARNING
Indicates a potentially hazardous situation, that if not avoided, can result in cuts or
being crushed. It calls your attention to items or operations that could be dangerous
to you & other persons operating this equipment.

Warranty –US and Canada
Rev E Approval Date: 12/01/2015
7761 W Kellogg Drive 67209-2003 - PO Box 9090 67277-0090 - Wichita, Kansas
Voice [phone] - [phone] - Fax [phone]
www.xltovens.com
XLT warrants gas ovens manufactured after April 1, 2009 and all electric ovens manufactured
after April 1, 2011 to be free from any defect in material and workmanship under normal use for five (5)
years from the date of original purchase by the end user, and further warrants main fan blades,
conveyor shafts, and conveyor bearings for ten (10) years. XLT further warrants all ovens to be free
from rust for ten (10) years from the date the equipment is originally purchased. XLT warrants AVI
hoods manufactured after December 1, 2015 to be free from any defect in material and workmanship
under normal use for five (5) years from the date of original purchase by the end user purchaser. In the
event of a part failure, XLT will furnish a replacement part and pay for all labor associated with the
replacement of the part. If upon inspection XLT determines that the part is not defective, all incurred
cost will be the responsibility of the end user purchaser. This warranty is extended to the original end
user purchaser and is not transferable without prior written consent of XLT. Damages are limited to the
original purchase price.
DUTIES OF THE OWNER:
 The owner must inspect the equipment and crates at time of receipt. Damage during shipment is to
be immediately reported to the carrier and also to XLT
 The equipment must be installed and operated in accordance with the written instructions
furnished with the unit
 This warranty shall not excuse the owner from properly maintaining the equipment in accordance
with the written instructions furnished with the unit
 A copy of the “Initial Start-Up Checklist” must be filled out and returned to XLT when the unit is
initially installed, and/or when the unit is removed and installed in another location
 The gas, electric, and HVAC utilities must be connected to the oven and installed by locally licensed
contractors
 Failure to contact XLT Ovens prior to contacting a repair company for warranty work voids any and
all warranties
WHAT IS NOT COVERED:
 Freight damage
 Overtime charges
 Any part that becomes defective because of utility services (power surges, high or low voltages, high
or low gas pressure or volume, contaminated fuel, or improper utility connections)
 Any part that becomes defective because of moisture and/or other contaminants
 Conveyor belts
 Filters
 Exhaust Fans
 Light Bulbs
 Normal maintenance or adjustments
 This warranty shall not apply if the equipment or any part is damaged as a result of accident,
casualty, alteration, misuse, abuse, improper cleaning, improper installation, improper operation,
natural disasters, or man-made disasters
CLAIMS HANDLED AS FOLLOWS:
Should any such defect be discovered, XLT must be notified. Upon notification, XLT will arrange for
necessary repairs to be made by an authorized service agent. Denial of services upon the arrival of an
authorized service agent will release XLT of any and all warranty obligations

Warranty –International
Rev G Approval Date: 12/01/2015
7761 W Kellogg Drive 67209-2003 - PO Box 9090 67277-0090 - Wichita, Kansas
Voice [phone] - [phone] - Fax [phone]
www.xltovens.com
When purchased through an Authorized International Distributor, XLT warrants its products
manufactured after July 1, 2014 to be free from any defect in material and workmanship under normal use. The
Authorized International Distributor will repair XLT products during the warranty period. This warranty is extended
to the original end user purchaser and is not transferable without prior written consent of the Authorized
International Distributor. Damages are limited to the original purchase price. Products purchased by any other
means other than an Authorized International Distributor will have no warranty. This warranty applies to areas
outside the 50 United States of America and Canada.
DUTIES OF THE OWNER:
 The owner must inspect the equipment and crates at time of receipt. Damage during shipment is to be
immediately reported to the carrier and also to the Authorized International Distributor.
 The equipment must be operated in accordance with the written instructions furnished with the unit.
 This warranty is not valid unless equipment is installed, started, and demonstrated under the supervision of
the Authorized International Distributor.
 This warranty shall not excuse the owner from properly maintaining the equipment in accordance with the
written instructions furnished with the unit.
 A copy of the “Initial Start-Up Checklist” must be filled out and returned to the Authorized International
Distributor when the unit is initially installed, and/or when the unit is removed and installed in another
location.
 The gas, electric, and HVAC utilities must be connected to the equipment and installed by locally licensed
contractors.
 The Authorized International Distributor must be contacted for service. Failure to contact the Authorized
International Distributor prior to contacting a repair company for warranty work voids any and all warranties.
WHAT IS COVERED (Subject to local market conditions):
 2 year labor Ovens –Extensions may be available and charges may apply
 5 year labor Hoods –Extensions may be available and charges may apply
 5 year parts –Extensions may be available and charges may apply
 5 years parts and labor on: oven fan blade, structural welds, conveyor shafts, conveyor bearings, rusted
materials in ovens
WHAT IS NOT COVERED (Subject to local market conditions):
 Freight damage
 Any part that becomes defective because of utility services (power surges, high or low voltages, high or low
gas pressure or volume, contaminated fuel, or improper utility connections)
 Any part that becomes defective because of moisture and/or other contaminants
 Conveyor belts
 Filters
 Exhaust fans
 Light bulbs
 Rusted materials in hoods
 Normal maintenance or adjustments
 This warranty shall not apply if the equipment or any part is damaged as a result of accident, casualty,
alteration, misuse, abuse, improper cleaning, use of caustic/acidic chemicals, improper installation, improper
operation, natural disasters, or man-made disasters
CLAIMS HANDLED AS FOLLOWS:
Should any such defect be discovered, the Authorized International Distributor must be notified. Upon
notification, the Authorized International Distributor will arrange for necessary repairs.

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6
XLT Ovens wants you to be totally satisfied with every aspect of owning & using your
oven & hood. Your feedback, both positive & negative, is very important to us as it helps us un-
derstand how to improve our products & our company. Our goal is to provide you with equipment
that we can be proud to build & you can be proud to own.
To receive technical support for the oven or hood you purchased, XLT has qualified cus-
tomer service personnel that can provide assistance on any type of XLT oven or hood equipment
problem you may experience. Customer Service is available 24/7/365 at 888-443-2751 or visit
www.xltovens.com.
GENERAL
Save this Manual
This document is the property of the owner of this equipment.
XLT Ovens reserves the right to make changes in design & specifications, and/or make ad-
ditions to or improvements to its product without imposing any obligations upon itself to install
them in products previously manufactured.
All Right Hand & Left Hand designations in this manual are from the point of view as if
standing directly in front of the glass sandwich door.
Repairs of all appliances & ventilation exhaust hoods should only be performed by
a qualified professional who has read & understands these instructions & is familiar
with proper safety precautions. Read this manual thoroughly before installing or
servicing this equipment.
DANGER
This manual, which contains an illustrated parts breakdown, has been prepared as an aid in
understanding how the unit operates, how to diagnose problems, and order parts for the equipment.
All of the parts, listed in the parts breakdown, are manufactured with the same precision as the
original equipment.
XLT parts and service providers are available worldwide. There are authorized service
providers located in the principle cities of the United States. There are also authorized Distributors
located throughout the world.
The Theory of Operation section describes how the unit operates. An understanding of
normal operation will greatly aid diagnosis and troubleshooting. The Troubleshooting section asks
simple yes or no questions. The next question or statement entirely depends upon the previous an-
swer. It will lead to the solution of a problem in the most efficient way. The illustrated parts sec-
tion identifies the various sub-assemblies and detailed parts which make up the equipment, as well
as the part number. An explanation of how to order parts is included.
This manual is designed to supplement the Installation & Operation Manual provided with
the unit when new. Please refer to it for descriptions, dimensions, weights, electrical requirements,
maintenance schedules, and certifications.

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Warning & Safety Information..................................................................................................... 2
Warranty....................................................................................................................................... 4
General ......................................................................................................................................... 6
Oven Theory of Operation ........................................................................................................... 8
Hood Theory of Operation ......................................................................................................... 14
Oven Troubleshooting................................................................................................................ 17
Hood Troubleshooting................................................................................................................ 18
Oven Service Procedures............................................................................................................ 20
Hood Service Procedures ........................................................................................................... 26
Oven Parts .................................................................................................................................. 29
Hood Parts .................................................................................................................................. 53
Oven Schematics ........................................................................................................................ 57
Hood Schematics........................................................................................................................ 66
TABLE OF CONTENTS
For maintenance procedures, please refer to the XLT Installation & Operation Manual.
Revision History Table
Revision Comments Date
A New Release 12/02/2015
B Added SAI Certification Symbol to Page 1, Added Warning to Page 18, and Updated Hood Schematic On
Pages 66-68, and Added R2 Relay To The Hood Theory of Operations On Page 15 1/26/2016

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8
When the Main Switch (S1) is turned on;
1. The Oven Fan Motor (M1) located in the Back Wall will run.
2. The Fan (M3) located on the Control Panel will run.
3. The Temperature Control (TC) will display both the actual and set-point temperatures.
4. The Conveyor Control (CC) will display the belt time.
5. The burner will ignite.
6. The conveyor belt will move.
The first part of the Theory of Operation explains how electrical power is delivered to the
oven and initial sequences when the main operator switch is turned on. The remainder of the The-
ory of Operation section explains the function of components in alphabetical order. These compo-
nents are also listed on the schematic.
OVEN THEORY OF OPERATION
 Line voltage for Standard Ovens is assumed to be 120 VAC, 60 Hz.
 Line voltage for World & Australian Ovens is assumed to be 230 VAC, 50 Hz.
 Line voltage for Korean Ovens is assumed to be 220 VAC, 60 Hz.
Power originates at the electrical connection on the wall. Line voltage is then carried into
the oven through the power cord to the Terminal Strip (TS). The Neutral line is connected to the
TS, and several jumpers are used to bridge along the TS to make connection points for multiple
neutral lines from all components inside of the control box and Oven Fan Motor (M1). Line 1 is
also connected to the TS. From the other side of the TS, a wire connects to Terminal T11 on the
Cool Down Timer (R1), then continues to the High Limit Switch (S3 World & Australian only),
through the Main Circuit Breaker (CB1), and stops at the Main Switch (S1). Unless the outlet on
the wall has no power, the circuit just described has power at all times.
When S1 is turned on, line voltage will be carried through the switch simultaneously to
four locations via two parallel circuits:
 Terminal T6 of the Cool Down Timer (R1)
 Terminal T5 of the Temperature Control (TC), via a Circuit Breaker (CB3)
 Transformer (XFMR)
 Power Supply (PS)
CAP - The Capacitor is physically mounted inside the Control Box but wired to the externally
mounted Oven Fan Motor (M1). The Oven Fan Motor (M1) is a Permanent Split Capacitor (PSC)
motor. PSC means a capacitor motor in which the starting capacitor and the auxiliary winding re-
main in the circuit for both starting and running. The CAP is a 30.0 uF +/- 6% 370VAC/B 50/60
Hz.
CB - Circuit Breakers are used to protect electrical components. The current value is printed on
the front of all breakers. If a CB is tripped, eliminate the cause and press the front to reset.

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9
OVEN THEORY OF OPERATION
CC - The Conveyor Control is supplied 24 VDC by the Power Supply (PS) via a Circuit Breaker
(CB6 & CB7, optional) to Terminals 4 & 5. The belt time is displayed, and is user-adjusted by
pressing and holding the up or down arrow button switches. See the Specification Sheet for mini-
mum and maximum belt times. The motor speed is calculated based on the time that is entered.
This time is translated to a RPM on the motor shaft depending on the size of the oven, the diameter
of the sprocket, and the gear ratio of the gearbox. Once the motor is running, hall sensor inputs are
fed back into the driver to determine the speed the motor is currently running at. This input goes
into a PID algorithm to adjust the Pulse Width Modulation (PWM) output to control the speed to
match the target speed that was calculated first. This PWM is adjusting the average voltage that
the motor phases are seeing. As the average voltage goes up, the motor will speed up. As the av-
erage voltage drops, the motor speed will also drop. The maximum speed is based on a continuous
18-24V being supplied to the motor. The phasing of the controller is dependent on the hall sensor
signals that are being returned. The controller reads the hall sensor position and from there knows
which phase of the motor receives the 18-24V signal, which phase of the motor is the return and
which phase of the motor is left open. As the motor spins, the hall sensors change, which dictate
which phases are energized.
FLT 1 - Is an inline filter used in world ovens. The filter is placed in series with the Line voltage
being supplied to the oven. The filter is used to reduce Electromagnetic Interference created by our
equipment and back-feeding it into other appliances. EMI filters use capacitors to inhibit direct
current while permitting alternating current. EMI filters also use inductors which redirect high
voltages, and high frequencies by dissipating them to ground.
FS Optical - The Optical Sensor consists of a plastic housing and an flame detector mount with
mirror. The optical sensor utilizes 24VDC which originates at the PS. The positive line is supplied
via the TC1 terminal 1&2 and terminates at the connector for the sensor. The negative line is sup-
plied via the TS #5 and terminates at the connector for the sensor. If the TC1 alarm would activate
and open the circuit, the optical sensor will loose voltage and cause the oven to shut down burner
functionality until alarm is closed. From the connector a brown wire sends a 6.75 μA signal to the
S1 Terminal of the IC. The minimum signal to maintain operation is .7 μA.
When flame is present, the sensor visually looks at the Flicker rate and the UV characteristics of
the flame. If either of these do not appear the sensor will not send current to the IC. The ignition
will continue thru its process until lockout.
IC - The Ignition Control (IC) is powered by 24 VAC from the Transformer (XFMR). Incoming
power will be interrupted by Centrifugal Switch (S2) mounted in the M1. When the IC receives
power, it initiates a pre-purge lighting sequence. A red LED will blink once after about 2-3 sec-
onds to give notification that the lighting sequence has started. After about 30 seconds, two events
occur; 1) a high-voltage electrical signal will be sent to the Spark Igniter (SI) from the Spark Ter-
minal, and 2) a 24 VAC signal will be generated across Terminals V1 & V2. The high voltage
jumps across a gap in the SI creating a spark that can be heard, although the IC only produces this
spark for four (4) seconds. One end of the Rectifier Plug is connected to Terminals V1 & V2
through a Circuit Breaker (CB5). The Rectifier Plug rectifies the 24 VAC to 24 VDC. The other

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10 OVEN THEORY OF OPERATION
end of the Rectifier Plug is connected to Terminals 1 & 5 of the Main Valve (V1-V2). The V1-V2
valve will open, allowing fuel to flow into the burner. When the two simultaneous events occur,
fuel flow and spark, ignition should occur. When flame is sensed by the FS, a DC signal is sent to
Terminal S1 of the IC. The IC uses this DC current to prove ignition. A minimum of .7 µA is re-
quired to maintain operation. If the Burner lights, the LED will not flash. If the Burner fails to
light, the LED will flash three (3) times, repeatedly, and the IC will not attempt to re-light.
M1 –The Main Motor is a Permanent Split Capacitor (PSC), single phase, capacitor run motor and
has an internal Centrifugal Switch (S2). The motor is dual voltage and reversible. The voltage to
power the motor comes from the Cool Down Timer (R1) terminal T9 via CB2, and the motor will
continue to operate for approximately 30 minutes after the main switch is turned off. There are no
user serviceable parts in the motor, and the bearings are permanently lubricated.
M2 - The Conveyor Motor (M2) is a brushless 24 VDC gear motor. The motor receives current
from the Conveyor Control (CC) through three (3) wires; 1) A black or “W” phase, 2) a white or
“V” phase, and 3) a red or “U” phase. They carry between 18 to 24 VDC. Each wire is energized
by the Conveyor Control (CC) in sequence to provide power to the individual stator coils which, in
turn, provide motor rotation.
To determine the rotors position and send this position to the controller, three (3) Hall Ef-
fect switches are utilized. They read the rotational information from a disc mounted on the rotor
assembly. This information is transmitted to the CC by three (3) wires; 1) an orange “U” phase
pole signal output, 2) a green “V” phase pole signal output, and 3) a green/white “W” phase pole
signal output. These are located in a plug that inserts into the CC. There are two (2) additional
wires in this plug; 1) a purple wire which is supply voltage for the pole sensor, and 2) a gray wire
that is ground.
The CC, using an internal logic circuit, energizes the stator coils to provide proper rotation
and sets the energization (phase) timing to obtain the desired belt speed set on the controller.
The motor drives an integral gear box that reduces the motor output speed to give the correct travel
time to the conveyor belt. The integral gear box is sealed and permanently lubricated with grease.
The ratio is 1/200. This motor contains no serviceable parts.
M3 - The Flow Path Pressure Generating (FPPG) fan supplies combustion air for the Burner. It is
wired in parallel with M1 and will continue to operate for 30 minutes after S1 is turned off. A fil-
ter is provided to ensure clean air.
PS - The Power Supply rectifies line voltage to 24 VDC, and supplies power to the Conveyor Con-
trol (CC) and Flame Sense (FS). A 4 amp fuse is used to provide over current protection, which is
mounted on the PS itself. There are no other fuses used anywhere else.
PU - The Pick-Up is physically mounted within the Conveyor Motor (M2) and utilizes hall effect
technology integral to the M2 to monitor the rotation speed. The hall effect signal is transmitted to
the CC, which converts it into linear travel speed of the conveyor.
R1 - R1 is a 30-minute off delay relay which functions as a cool down timer. Applying power to
T6 activates the relay, which sends a voltage signal out from T9. When power is removed from

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11
OVEN THEORY OF OPERATION
T6, voltage continues from T9 for 30 minutes. T9 supplies voltage to the Main Fan Motor (M1)
through a Circuit Breaker (CB2), and also supplies voltage to the FPPG (M3) Fan. M1 and M3 are
the only components that will continue to operate for 30 minutes after S1 is turned off. The off
delay relay is a safety feature to allow the oven to cool down to room temperature, and to eliminate
heat stress on the components of the oven.
R2 - Proving Relay (Australia). This is a relay that proves the Main Motor (M1) has come to a stop
before the motor can be started. This is used to provide combustion air to the burner. Voltage from
the XFMR travels through Proving Relay (R2) to Centrifugal Switch (S2) (which is closed) back
to R2 to activate the relay. Once this happens R2 is held open by a jumper from terminal R2-B to
terminal R2-9 until the S2 is cycled to the off position. If the burner fails to light or has a loss of
flame then the Manual Reset (S4) must be triggered and wait for the main fan motor to come to a
complete stop.
RP - The Rectifier Plug has an integrated full-wave bridge rectifier circuit. It converts 24 VAC
from the Ignition Control (IC) into 22 VDC that is sent to the Multi-Valve (V1-V2).
S1 - The Main Switch is a SPST normally open switch, mounted on the front of the Control Box.
Activating this switch applies voltage to Terminal T6 of the Cool-Down Timer (R1) and to the pri-
mary side of the Transformer (XFMR). When used with the optional XLT Hood System, a remote
switch mounted in the front of the XLT Hood replaces it.
S2 - This Switch is a SPDT centrifugal switch physically mounted inside the Main Motor (M1).
When M1 comes up to full speed, S2 closes and sends a 24 VAC signal to the Ignition Control
(IC) and the Signal Conditioner (SC). It functions as a safety feature to prevent burner operation if
the M1 fails to rotate.
S3 - High Limit Switch (World & Australia). This is a bi-metal, NC, SPST switch physically
mounted in the side panel of the Bake Chamber. It’s purpose is to provide fail safe operation. If
the temperature of S3 exceeds 600°F, it opens and interrupts line voltage to all components except
the Main Motor (M1).
S4 - This momentary switch is a SPST normally closed switch, mounted on the rear of the Control
Box. Activating this switch this switch breaks the supply voltage to Terminal T11 of the Cool-
Down Timer (R1) and cancels the 30 minute cool down cycle. This switch is only used for the
Australian certified ovens to allow the user to reset the Proving Relay (R2) when there is a loss of
flame. After this switch is activated you must wait 5 minutes or until the main fan motor has come
to a complete stop.
SC - The Signal Conditioner is powered by 24 VAC from the Transformer (XFMR) via the Main
Motor Centrifugal Switch (S2) and the Temperature Control (TC) on terminals 1 & 2. Incoming
power will be interrupted by the Main Fan Motor if it stops rotating. The function of the SC is to
convert a 4-20 mA signal from the TC to a 45-250 mA signal and then applies that signal to the
Multi Valve (V3). This in turn modulates the valve to allow an appropriate amount of fuel to con-
trol temperature.

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12 OVEN THEORY OF OPERATION
SI - The Spark Igniter consists of a copper-clad metal mounting plate, and an electrode encapsu-
lated in ceramic insulation. The insulated electrodes has a 1/4” male spade welded to it. This spade
connects to the Spark Terminal on the Ignition Control (IC) via a spark wire. The end of this rod is
positioned near the burner tube in such away so as to create a small gap. When the high-voltage
signal from the IC reaches the gap, it is forced to jump the gap resulting in a spark.
T/C - The thermocouple is a type K. It consists of two different conductors that produce a voltage
proportional to a temperature difference between either end of the pair of conductors. The T/C is
connected to Terminals 9 & 10 of the TC. The millivolt signal is used to display the actual tem-
perature.
TC1/TC2 - The Temperature Control (TC) has line voltage applied to terminal T5, and neutral
voltage applied to terminal T4. There are two displays; one for actual temperature and one for set-
point temperature. Actual temperature is determined by the Thermocouple (T/C), connected to
terminals 9 & 10, with T9 being the negative terminal and T10 being the positive terminal. The
user determines the set-point temperature by pressing and holding the <UP> or <DOWN> arrow
button switches. The TC sends a 4-20 mA (milliamp) signal to the Signal Conditioner (SC) de-
pending upon the relationship between actual temperature and set-point temperature. An alarm
relay exists between terminals 1 & 2, If the actual temperature achieves temperatures above set
temperature the alarm circuit will open and not allow voltage to be supplied out to the FS. The
Maximum Operating Temperature is set at the factory and cannot be field adjusted.
V1-V2 & V3- The Multi-Valve assembly has three (3) Gas Valves. The Main Valves (V1-V2)
operate in series, and are wired in series via the Rectifier Plug. The Rectifier Plug rectifies 24
VAC from the Ignition Control (IC) to 22 VDC. V1-V2 are solenoid valves and are open continu-
ously during burner operation, regardless of either actual or set-point temperature values. V3 is a
modulating valve, and is controlled by a variable electrical signal from the Signal Conditioner
(SC). There are two (2) fuel pressure testing ports; one for incoming pressure, and one for both
high-bias and low-bias pressure. The upper port is used for incoming pressure, while the lower
port is used for high- and low-bias pressure. There are two (2) hex adjusting nuts; an 8mm nut for
adjusting high-bias pressure, and a 5mm nut for adjusting low-bias pressure.
XFMR- The Transformer steps down line voltage to 24 VAC. It supplies power to the Signal
Conditioner (SC), Ignition Control (IC), and the Centrifugal Switch (S2). One terminal on the sec-
ondary side is connected to chassis ground by a green wire. The XFMR is ON whenever the Main
Switch (S1) is on, and is independent of the Cool Down Timer (R1). Note: The XFMR is
equipped with an integrated circuit breaker for standalone protection on Standard ovens only.

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14 HOOD THEORY OF OPERATION (STD w/FS)
The first part of the Theory of Operation explains how electrical power is delivered to the
hood and initial sequences when the HUI switch is turned on. The remainder of the Theory of
Operation section explains the function of components in alphabetical order. These components
are also listed on the schematic.
Power for the hood originates at the building’s electrical service panel. A total of four (4)
circuits are required; circuit (1) is a single phase high voltage circuit for VFD/Fan circuit that con-
nects to TS 1 terminals 1 & 2, and circuit (2, 3, and 4) are single phase low voltage minimum 20A
circuits for each oven that connects Hood Machine Control (HMC) P3 1, 5, and 9 for line side, and
neutral will connect at 3, 7, and 11. Lights piggyback off the top oven power P3 terminal 9 on
HMC.
HUI mounted on the hood controls lighting, VFD activation, Make Up Air (MUA) activa-
tion and oven function. When HUI Light Switch is touched a relay is closed and voltage will go to
lights. When ovens are installed with a hood, the Switch Relocation Cord (SRC) effectively elimi-
nates the main switch located on the oven and transfers control to HUI switches on the hood.
When HUI switches are touched a communication signal is sent to the VFD via ModBus signaling
it to turn on to a set frequency, at the same time when HUI2 is activated a relay will allow line
voltage to be carried through the Switch Relocation Cord (SRC) to the oven activating it. When
HUI2-4 are activated the MUA will turn on. The VFD has a built in power supply that is wired to
terminal 01 this puts the VFD in run mode so whenever a power loss is sensed the VFD will start
back up in run mode once power is restored. The NO switch in the fire alarm system in the build-
ing needs to be connected to TS 1 terminals 9 & 10. When the alarm is activated 24 VDC from
TS1 9 will return from the fire alarm system to TS1 10 then to HMC P8 to turn off lights, cooling
fans, HUI, MUA, shut down ovens and making both relays R1 & R2 switch from NC to NO, caus-
ing the VFD to run at 60 Hz.
CB - Circuit Breakers are used to protect electrical components. If a CB is tripped, eliminate the
cause and press the front to reset.
HUI –Hood User Interface contains the factory settings so that the hood will operate with the cor-
rect hertz when the correct oven size and number of ovens are selected. The factory settings also
contain a selection for a VFD, Non VFD, type of MUA activation, and for a World installation. A
beeping sound and the display will flash if an alarm occurs. An error message will display at top of
screen on HUI. Touching the “I” button will give a brief description of how to correct the error
(see Figure 1). Touching the “Light Bulb” button will turn the light on and off inside the hood.
When any one of the three oven switches on the Hood User Interface (HUI) are touched
(capacitive touch);
1. The Exhaust Fan Motor (M1) located on the roof will run.
2. The ovens associated with the corresponding switches will turn on.

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15
HOOD THEORY OF OPERATION (STD w/FS)
Touching the “Silver Square” buttons will turn each oven on or off and sequence the operation of
the VFD and the MUA circuits. RS485 cable supplies power and communication between the HUI
and HMC.
HMC –The Hood Machine Control is a printed circuit board that has all the relays to control these
functions; oven activation SRC, MUA activation, VFD activation, monitors the air proving
switches, and lighting activation. The HMC receives a continuous 24 VDC power source provided
the CB1 breaker is on. This component also has independent relays to control oven power for fire
suppression. If a signal from the fire system is received the oven(s) and lighting power is discon-
tinued and the VFD will run at full speed. For a World installation, sail switch monitoring is avail-
able just by answering some questions through factory mode programming. The HMC will also
program the PowerFlex 4M VFD each time the CB1 breaker is turned on. ModBus communication
is used to change the frequency the VFD runs at depending on the number of ovens used. Error
messages will appear on the screen to help with troubleshooting. The screen will flash and beep
indicating a error has occurred, the alarm button can cancel this for 2 hours. If error has not been
fixed beeping will return. The HMC has filter cleaning reminders available.
LT1 & LT2 - These are light bulbs at each end of the hood, and should illuminate when the HUI
light button is touched, touch it again and the light turns off.
M1 –The Exhaust Fan Motor is a 3-phase, direct drive motor. In normal operation, it is powered
by the VFD and its RPM will vary as the frequency from the VFD varies. There are no user ser-
viceable parts in the motor, and the bearings are permanently lubricated.
M2 & M3 –The Cooling Fan Motor is a 24 VDC, direct drive motor. In normal operation, it is
powered through HMC. These fans are used to keep the control box for the hood cool. There are
no user serviceable parts in the motor, and the bearings are permanently lubricated.
PLUG 1, 2, & 3 –These are circular electrical plugs on one end of the Switch Relocation Cord
(SRC). The plugs connect to Receptacles 4, 5, & 6 on the back of the hood. The other end of the
SRC plugs into the oven wire harness, and eliminates the operator switch supplied in the oven.
Conversely, when the HUI on the hood is turned off, the corresponding oven is turned off as well.
PS –The Power Supply rectifies line voltage to 24 VDC, and supplies power to the HMC, cooling
fans, and fire suppression
R1 –Is a SPDT relay, which is an electrically operated switch. It uses an electromagnet to operate
a switching mechanism. Voltage is supplied from TS1-9 to Ansul agent box. Once the fire alarm
is activated voltage returns to TS1-10 over to HMC P8. That same voltage continues to R1-1 acti-
vating the coil in the relay, causing the contacts in the relay to switch from NC to NO. This will
switch 24 VDC from terminal 6 to terminal 5 on the VFD causing the M1 to operate at 60 Hz.
R2 –Is a SPDT time delay relay, which is an electrically operated switch. It uses an electromag-
net to operate a switching mechanism. Voltage continues from R1-1 to R2-A2 to activating the
coil in the relay, causing the contacts in the relay to switch from NC to NO after a set time has ex-
pired. This action delays the application of the voltage on terminal (5) on the VFD.

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16 HOOD THEORY OF OPERATION (STD w/FS)
REC 1, 2, & 3 - These are electrical receptacles, which supply line voltage for the ovens. Each
receptacle should have a 20A dedicated breaker supplied from the buildings electrical panel. Line
voltage to each receptacle is supplied via HMC P3. If fire alarm is activated P3 will disrupt line
voltage being supplied to receptacle shutting the oven off.
REC 4, 5, & 6–These are circular electrical receptacles mounted on the back of the hood. The
Switch Relocation Cord (SRC) connects into these. This deactivates the main oven switch located
on the oven and relocates the operation of it to the HUI. This capacitive touch (NO) switch is lo-
cated on the front of the hood and controls the lights.
TS 1 & 2- These are terminal strips, that serve as a connection point for wires.
VFD - The Variable Frequency Drive (VFD) converts the AC supply voltage to DC and then con-
verts the DC to a suitable three-phase frequency source for M1. Incoming power connects to ter-
minals L1 & L2. M1 connects to terminals T1, T2, & T3 through TS1. The HMC sends the com-
mand to the ModBus to set the frequency for the combination of ovens selected. The VFD can re-
ceive a signal from the fire suppression system to command the drive to run at 60 Hz.
A complete manual can be found at www.xltovens.com.
Figure 1
Hidden Button (XLT)
Hood Lights
Alarm Mute
Error Information
Oven Off (Outline)
Oven On (Filled)
Exhaust Fan On
Exhaust Fan Speed
Oven Capacitive Touch Buttons

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17
OVEN TROUBLESHOOTING
1. Verify that the power cord to the oven is connected and/or plugged in if equipped with a plug
and receptacle.
2. Check all circuit breakers on the oven control panel to ensure they have not been tripped.
3. Check to see that the circuit breakers in the building electrical service panel have not been
tripped or turned off.
4. Check the Manual gas valve to verify that it is turned on completely. The handle on the valve
should be parallel with the gas piping when the valve is turned on, and the handle will be per-
pendicular with the gas piping when the valve is turned off. Also remember that anytime the
gas hose has been disconnected it will take time to purge the air from the gas train.
5. Verify that oven is supplied with gas by disengaging and reengaging the quick-disconnect fit-
ting on the gas hose.
6. Check to see that the oven is fully assembled. All of the fingers must be properly installed.
Incorrect or incomplete finger placement can cause a “windy” condition that can cause the
burner not to light.
7. Gas line size and pressure must be adequate to support total BTU requirements with all appli-
ances in store turned on. Refer to the “Oven Gas Requirements” section of this manual.
8. (Australia Only) In the case of the oven not lighting properly. Turn off the oven and press and
hold the manual reset switch on the back of the control box for five seconds. Wait approxi-
mately 30 seconds or until the fan stops spinning and turn the oven back on.
9. (World Installations) If using the Sail Switches check the HUI for error messages relating the
Sail Switch sequencing.
If your oven does not function properly, please verify the following conditions:
If your oven still does not function properly, XLT has qualified customer service personnel
that can provide assistance on any type of XLT oven problem you may experience. Customer Ser-
vice is available 24/7/365 at 888-443-2751, or visit www.xltovens.com.
Mechanical Function

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18 HOOD TROUBLESHOOTING
Initial troubleshooting of the hood:
1. Remove panel covering VFD to check and see if the circuit breaker is tripped.
2. Check the actual frequency of the VFD controller. To access the actual frequency, press
<ESC> button until the Display Mode shows D001.
3. Check to see that the breaker in the service panel is not tripped.
4. Make sure the Switch Relocation Cords (SRC) are properly installed to the oven(s).
5. Check to see that the grease filters are clean & installed properly.
6. Check to see if the exhaust fan is rotating in the correct rotation. To verify fan rotation,
remove the lid on the exhaust fan. Visually inspect rotation in accordance with label on fan
housing.
The VFD has internal diagnostics, and may show the following ERROR codes:
 F004 DC bus voltage fell below min value.
 F005 DC bus voltage fell below max value.
 F007 Motor Overload.
 F008 Heat sink Over Temp.
 F013 Ground Fault.
 F081Comm Loss- RS485 port stopped communicating.
If any of the above error codes are displayed, then follow these steps to clear them.
1. Record error code on HUI.
2. Take the cover off the hood.
3. Cycle power with circuit breaker
If the corrective actions listed above do not correct the problem, then XLT has qualified
customer service personnel that can provide assistance on any type of XLT Oven or AVI Hood
problem you may experience. Customer Service is available at 888-443-2751 24/7/365, or visit
www.xltovens.com.
For repairs or maintenance of the fire suppression system and components, contact the lo-
cal Ansul dealer or XLT for assistance.
Hood Machine Control LED Lights:
1. When the Red LED is lit it indicates an MC error.
2. When the first Green LED is lit it indicates power to MC.
3. When the second Green LED is lit it indicates that the exhaust fan on.
4. When the third Green LED is lit it indicates the MC communication to the
VFD.
Removing the hood VFD cover panel exposes high voltage. Proceed with cau-
tion and read the following the instructions carefully.
HIGH
VOLTAGE

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20
Conveyor Control Programming Procedure
OVEN SERVICE PROCEDURES
Read the entire instruction before programming.
TIP
Configuration Key Functions
< L > = Behind the <L> in XLT is a hidden button. This is used along with the up and down
button to access the programming mode. Use this after each step to advance to the
next parameter when programming.
UP = Increases the setting of the selected parameter.
DOWN = Decrease the setting of the selected parameter.
1. Enter Programming Mode/Program the bake length
 Press the <L> button and both <UP> and <DOWN> button simultaneously to enter
programming mode.
 0055 will appear on screen, this is already set from factory
 Press the <UP> button until the desired belt length is displayed. Belt lengths will read
as follows:
1832 = 0032
2440 = 0040
3240 = 0040
3255 = 0055
3270 = 0070
3855 = 0055
3870 = 0070
2. Program the Total Reduction Value - Press the <UP> button until the desired settings is
reached. All ovens = 300.
3. Set Speed Trimming Value - Press the <DOWN> button until the display shows 0000.
4. Set Fast Bake Limit - Press the <UP> button until the display shows 1:30.
5. Set Slow Bake Limit - Press the <UP> button until the display shows 17:00.
6. Set Conveyor Motor Rotation - Press the <UP> OR <DOWN> buttons until the display shows
1 for right-to-left direction, or 2 for left-to-right belt direction.
7. Set Conveyor Control default to 556 (in/rev).
8. Save and Exit Programming Mode - Press the <L> button two (2) times to save and exit Pro-
gramming Mode.
After leaving Program Mode, 1:30 run time will appear on the display. Press and hold the <UP> or
<DOWN> buttons until desired run time appears.