Viking Professional VGSO100 User manual

Service
Manual
30” Gas
Single Wall Oven
Preferred Service
VGSO100
SMC-0006A
Feb 2012
®
This manual is to be used by qualied appliance technicians only. Viking
does not assume any responsibility for property damage or personal
injury for improper service procedures done by an unqualied person.
This Base Manual covers general and
specic information including, but not
limited to the following models:

Table of Contents
2©2012 Viking Preferred Service
Safety Information ............................................ 3
Warnings ...........................................................4
Electrical Requirements .................................... 4
Manual Shut-Off Valve: .................................... 5
Pressure Regulator: .......................................... 5
Flexible Connections: ....................................... 5
Rigid Connections: ........................................... 5
Model – Serial Number Matrix .........................6
Oven Main Panel ..............................................7
Service Situation Chart .................................... 9
Parts Location – Control Panel ...................... 10
Parts Location – Rear Oven ........................... 11
Parts Location – Top ....................................... 12
Parts Location – Main Oven ........................... 13
Door Removal ................................................. 14
Door Reinstallation ......................................... 14
Component Testing ........................................ 15
Troubleshooting Guide ................................... 16
RTD Sensor .................................................... 17
Cavity Lights ...................................................17
High Limit ........................................................ 18
Cooling Fan Switch ......................................... 18
Convection Fan Motor .................................... 18
Control ............................................................19
Electronic Thermostat ..................................... 19
Selector Switch ............................................... 20
DSI Module ..................................................... 20
Test Procedures – DSI Module ....................... 21
Bake and Broil Solenoids ............................... 22
VGSO100 Oven (Units manufactured before
serial # 072711C00029673 ............................. 23
VGSO100 Oven (Units manufactured after se-
rial # 072711C00029673 ................................ 24

Important Information
©2012 Viking Preferred Service 3
SAVE THESE INSTRUCTIONS
REVIEW ALL SERVICE INFORMATION IN THE APPROPRIATE SERVICE MANUAL AND TECHNICAL SHEETS
BEFORE BEGINNING REPAIRS.
Pride and workmanship go into every product to provide our customers with quality products.
It is possible, however, that during its lifetime, a product may require service. Products should
be serviced only by a qualified service technician that is familiar with the safety procedures
required in the repair and who is equipped with the proper tools, parts, testing instruments, and
the appropriate service manual.
Safety Information
We have provided many important safety
messages in this manual and on the appliance.
Always read and obey all safety messages.
This is the safety alert symbol.
This symbol alerts you to hazards that can kill
or hurt you and others. All safety messages will
be preceded by the safety alert symbol and the
word “DANGER”, “WARNING”, or “CAUTION”.
These words mean:
IMMEDIATE HAZARDS WHICH WILL RESULT IN
SEVERE PERSONAL INJURY OR DEATH.
Hazards or unsafe practices which COULD result in
severe personal injury or death.
Hazards or unsafe practices which COULD result in
minor personal injury or product or property damage.
All safety messages will identify the hazard, tell
you how
to reduce the chance of injury, and tell you
what can
happen if the instructions are not followed.
To avoid risk of serious injury or death, repairs should
not be attempted by unauthorized personnel.
VIKING will not be responsible for any injury or
property damage from improper service procedures.
If performing service on your own product, you must
assume responsibility for any personal injury or
property damage which may result.
Technical support for authorized servicers:
1-800-914-4799
Address your written correspondence to:
Viking Preferred Service
1803 HWY 82 West
Greenwood, MS 38930
!
DANGER!
WARNING!
CAUTION!
WARNING!
CAUTION!

General Information
4©2012 Viking Preferred Service
Warnings
Read and follow all instructions before using
this appliance to prevent the potential risk of
re, electric shock, personal injury, or damage
to the appliance as a result of improper usage
of the appliance. Use appliance only for its
intended purpose as described in this manual.
To ensure proper and safe operation:
appliance must be properly installed and
grounded by a qualied technician. DO
NOT attempt to adjust, repair, service, or
replace any part of your appliance unless it
is specically recommended in this manual.
All other servicing should be referred to a
qualied servicer. Have the installer show you
the location
of the gas shut-off valve and how to shut off in
an emergency.
DANGER!
Fire/explosion hazard.
IF THE INFORMATION IN THIS MANUAL IS
NOT FOLLOWED EXACTLY, A FIRE
OR EXPLOSION MAY RESULT CAUSING
PROPERTY DAMAGE, PERSONAL INJURY,
OR DEATH.
• DO NOT store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
• WHAT TO DO IF YOU SMELL GAS
- Do not try to light any appliance.
- Do not touch any electrical switch.
- Do not use any phone in your building.
- Immediately call your gas supplier from
a neighbor’s phone.
- Follow the gas supplier’s instructions.
- If you cannot reach your gas supplier,
callthefiredepartment.
Installation and service must be performed
by a qualied installer, service agency, or the
gas supplier.
Electrical Requirements
Check your national and local codes
regarding this unit. These ovens require
3-wire, 120 VAC/60 Hz.
WARNING!
Electrical shock hazard.
To avoid the risk of electrical shock,
personal injury or death; verify electri-
cal power is turned off at the breaker
box and gas supply is turned off until the
oven is installed and ready to operate, in-
stallation by an authorized installer only.
WARNING!
Electrical shock hazard.
Disconnect the electric power at the main
fuse breaker before replacing bulb.
Gas Connection
The gas supply (service) line must be the
same size or greater than the inlet line of the
appliance. This oven uses a 1/2” (1.3 cm) ID
NPT (Sch40) inlet. Sealant on all pipe joints
must be resistive to LP gas.
The oven is designed specically for natural
gas or liquid propane (LP) gas. It is shipped
from the factory adjusted for use with natural
or propane (LP) gas. Before beginning
installation verify that the model is compatible
with the intended gas supply.
Gas leak hazard.
To avoid risk of personal injury or death; leak
testing of the appliance must be conducted
according to the manufacturer’s instructions.
Before placing appliance in operation, always
check for gas leaks with soapy water solution.
DO NOT USE AN OPEN FLAME TO
CHECK FOR GAS LEAKS
DANGER!

General Information
©2012 Viking Preferred Service 5
Manual Shut-Off Valve:
This installer-supplied valve must be installed
in the gas service line before the appliance
in the gas stream and in a location where
it can be reached quickly in the event of an
emergency.
In Massachusetts: A “T” handle type manual
valve must be installed in the gas supply line
to the appliance.
IMPORTANT: Any conversion required must be
performed by your dealer or a qualied licensed
plumber or gas service company. Please provide
the service person with this manual before work
begins.
Pressure Regulator:
• All heavy duty, commercial type equipment
must have a pressure regulator on the
incoming service line for safe and efcient
operation, since service pressure may
fluctuate with local demand. External
regulators are not required on this oven
since a regulator is built into each unit at the
factory. Under no condition bypass this built-in
regulator.
• Manifold pressure should be checked with a
manometer, natural gas requires 5.0” W.C.P.
and LP gas requires 10.0” W.C.P. Incoming
line pressure upstream from the regulator
must be 1” W.C.P. higher than the manifold
pressure in order to check the regulator. The
regulator used on these ovens can withstand
a maximum input pressure of 1/2” PSI (14.0”
W.C.P.). If the line pressure is in excess of
1/2” PSI (14.0” W.C.P.), a step down regulator
will be required.
• The appliance must be disconnected from the
gas supply piping system during any pressure
testing of that system.
Flexible Connections:
If the unit is to be installed with flexible
couplings and/or quick-disconnect fittings, the
installer must use a heavy-duty AGA design-
certified flexible connector of at least 1/2” (1.3
cm) ID NPT (with suitable strain reliefs) in
compliance with ANSI Z21.41and Z21.69.
Rigid Connections:
Incoming gas from the service supply is
brought from an intake pipe (not supplied) to
the back center of the unit through the shut-
off valve (not supplied) to the regulator. (See
“Cutout Dimensions” section for gas inlet
location.)
In Canada: CAN 1-6, 10-88 metal connectors
for gas appliances and CAN 1-6.9 M79 quick
disconnect devices for use with gas fuel.
In Massachusetts: This appliance must be
installed with a 36” (3-foot) long flexible gas
connector.
WARNING!
WARNING!
DO NOT use the handl e or oven door to lift
the oven. Remove door before installation to
ensure that it is not used to lift the unit.
NEVER use this applian ce as a space heater
to heat or warm the room. Doing so may
result in carbon monoxide poisoning and
overheating of the oven.
CAUTION!
CAUTION!
Before placing the oven into operation,
always check for gas leaks with a soapy
water solution or other acceptable method.
DO NOT USE AN OPEN FLAME TO CHECK
FOR LEAKS.
DO NOT use the handle or oven door to lift
the oven. DO NOT lift or carry the door by the
handle. Removing the door must be done by
your dealer, a qualified licensed plumber, or
certified gas installer.

General Information
6©2012 Viking Preferred Service
Model – Serial Number Matrix
The model number and serial number are located on the data plate. The data
plate is located on the top left side of the oven cavity under the control panel.
Model Numbers V G S O 1 0 0 S S
Viking Professional Series
Gas
Single
Oven
30" Wide
Stainless
Serial Numbers
02 15 12 C0000264
Month
Day
Year of Manufacture
Serial Number
The model and serial number tag is located on
the inner frame to the lower left behind the door
on older model units.

Operation
©2012 Viking Preferred Service 7
OVEN
OFF OFF
OVEN
LIGHT
BROIL BAKE 200
BROIL
CONV .
BROIL
CONV.
BAKE
CLOCK MIN/SEC
TIMER
SET
BAKE
TIME
ST AR T
TIME
300 500
400
OVEN FUNCTION TEMPERA
TURE
Oven Main Panel
Interior
Oven Light Control The
oven has interior oven
lights that are controlled
by one switch on the
control panel. Push the
switch to turn the interior
oven lights on and off. Oven Function
Selector
Electronic Timing Center The
Electronic Timing Center is used
to program and control all timing
functions.
IMPORTANT–The time-of-day
must be set before any
other program can be used.
Off/On Indicator light
Temperature Control
Each oven has a separate
temperature control dial. The
controls can be set at any
temperature from 200˚ F (93° C)
to 550˚ F (288° C). ALWAYS be
sure the controls are in the “OFF”
position when the ovens
are not in use.
BAKE (Natural Airflow Bake)
Use this setting for baking, roasting, and
preparing casserole dishes.
Convection Bake
Use this setting to bake and roast foods at
the same time with minimal taste transfer.
BROIL (Infrared Broil)
Use this setting for broiling dark meats at
1” thickness or less where rare or medium
doneness is desired.
CONVECTION BROIL (Infrared Convection
Broil)
Use this setting to broil thick cuts of meat.
Convection Dehydrate (CONVECTION
BAKE) Use this function to dehydrate fruits
and vegetables.
Convection Defrost (CONVECTION BAKE)
Use this function to defrost foods.

Operation
8©2012 Viking Preferred Service
The 30” Single Wall Oven models offer the following cooking cycles:
Bake
(Natural Airflow Bake)
Full power heat is radiated from the U-shaped
bake burners in the bottom of the oven cavity and
is circulated with natural airflow. This function is
recommended for single rack baking. Many
cookbooks contain recipes to be cooked
in the conventional manner. Conventional
baking is suitable for dishes that require a high
temperature. Use this setting for baking and
preparing casserole dishes.
natural airflow bake
Convection Bake
convection bake
Heat is radiated from the U-shaped bake burners
in the bottom of the oven cavity. The heated air
is circulated by one motorized fan in the rear of
the oven providing a more even heat distribution.
Multiple rack use is possible for the largest baking
job. When roasting, cool air is quickly replaced—
searing meats on the outside and retaining more
juices and natural flavor on the inside with less
shrinkage. This even circulation of air equalizes
the temperature throughout the oven cavity
and eliminates the hot and cold spots found in
conventional ovens.
Broil (Infrared Broil)
The broil burner at the top of the oven heats the
metal screen until it glows. Heat radiates from the
GourmetGlo™ infrared broiler located at the
top of the oven cavity. The distance between the
foods and the broil elements determines broiling
speed. For “fast” broiling, food may be as close as
2 inches (5 cm) to the broil element or on the top
rack. “Fast” broiling is best for meats where rare
to medium doneness is desired. Use this setting
for broiling small and average cuts of meat.
Convection Broil
(Infrared Convection Broil)
The top element operates at full power. This
function is exactly the same as regular broiling
with the additional benet of air circulation by
the motorized fan in the rear of the oven. Smoke
is reduced since the airflow also reduces peak
temperatures on the food. Use this setting for
broiling thick cuts of meats.
infrared broil
infrared convection broil

Operation
©2012 Viking Preferred Service 9
Service Situation Chart
The chart below is a basic overview of the serviceability and accessibility of components in the oven.

Service Procedures
10 ©2012 Viking Preferred Service
Parts Location – Control Panel

Service Procedures
©2012 Viking Preferred Service 11
Parts Location – Rear Oven

Service Procedures
12 ©2012 Viking Preferred Service
Parts Location – Top
Left Blower Right Blower
High Limit Fan Switch
Left blower was added on units produced
after serial # 072711C00029673

Service Procedures
©2012 Viking Preferred Service 13
Parts Location – Main Oven

Service Procedures
14 ©2012 Viking Preferred Service
Door Removal
In order to remove the oven doors, you will
rst need to locate the hinge locking pins that
were supplied with the packing material. THE
PINS MUST BE IN PLACE in order to remove
the door without damaging the oven door or
frame.
Open door completely and place pin into the
pin hole.
Using a Phillips head screwdriver, remove the
left and right hinge trim and place to the side.
With the pins in place, close the door until
pins stop door.
Lift the door up and then towards you. The
door will come off with the left and right
locking pins holding the door hinges in place.
Place the door on a protective surface.
Door Reinstallation
In order to reinstall the door, grasp rmly from
each side and align the door hinges into the
receivers on both sides of the oven frame.
Allow the hinges to gently drop into place.
Open door to the full 90˚ position and remove
the door pins. Reinstall the hinge trim. Make
sure to return the door pins to a safe place
should the door need to be removed in the
future.

Service Procedures
©2012 Viking Preferred Service 15
Component Testing
The chart shown here is a Temp-to-Resistance Chart
for RTD.
The oven sensor is also know as a P.T.C. (Positive
Temperature Control) device which means that as the
temperature rises, the resistance increases.

Service Procedures
16 ©2012 Viking Preferred Service
Troubleshooting Guide
Below and on the following page are some general guides should a problem be detected. Please
refer to the test procedures in this manual to determine the defective component.

Service Procedures
©2012 Viking Preferred Service 17
RTD Sensor
The oven utilizes an RTD (Resistance
Temperature Detectors) to measure the
temperature in the oven cavity. As the
temperatures rise and fall, the resistance
in the RTD changes. These changes are
interpreted by the Main Control, thus
controlling the bake and broil burners. As the
temperature rises, the resistance increases.
Page 18 shows the ratio of temperature to
resistance.
To access the RTD sensor, locate the sensor
at the upper rear wall of oven cavity. Remove
securing screws and gently pull the sensor
forward. The RTD has a Molex connector
that once disconnected allows testing of the
sensor. With the sensor disconnected and
Volt-Ohm Meter set to Ohms, record the
sensor resistance. At room temperature the
resistance should be approximately 1050
ohms. If the resistance reading is zero ohms
or extremely high, replace the RTD. If the
readings are within range, ohm each wire to
ground. If resistance is present, then the RTD
is grounded and the physical wires must be
checked for a grounded connection. If the
RTD resistance is within range and the wires
are not grounded, the RTD is functional and
should not be replaced.
Note: When reinstalling the sensor, make
sure the wire is pushed completely through
insulation blanket. Failure to get the wires
through the insulation blanket can overheat
the wires resulting in defective wires.
Cavity Lights
The oven utilizes 120 volt Halogen bulbs
to illuminate the oven cavity. The lights are
switched on by depressing the oven light
switch on the control panel.
To access the cavity lights, locate in the oven
cavity. Remove the screws securing the lens.
Remove the bulb from the socket once cool.
With Volt-Ohm Meter set to Ohms, measure
the resistance across the socket terminals
(white/red to white/blue). If resistance is
found, the socket and wiring is good and the
bulb should be replaced. If no resistance
is found, check the wiring for a short or break.
If wiring is good, the problem lies in the
socket

Service Procedures
18 ©2012 Viking Preferred Service
High Limit
The oven is protected by a high temperature
limiter. The limiter is located directly behind
the control panel. To access, slide the wall
oven forward 6” to
8”. Remove the screws securing the top trim
piece, the screws securing the control panel
(two at top and bottom, and screws on side
of control panel). With control panel removed,
limiter will be accessible on the right hand
side. The limiter is normally closed
and will open at 180˚F.
Cooling Fan Switch
The cooling fan is activated by a temperature
switch. The switch is located on the right
hand side by the cooling fan.
To access the switch, remove the oven from
installation. The main top will need to be
removed and the switch will be visible along
the right hand side by the cooling fan. The fan
switch is normally open and closes at 160˚F,
energizing the cooling fan.
Convection Fan Motor
The oven utilizes a 120 VAC convection fan
motor to move air through the cavity. When
the convection fan motor is required, power is
supplied from the thermostat through selector
switch.
To access the convection fan assembly,
remove the oven door, oven racks, and
convection fan cover. The assembly is now
accessible and can be removed from inside
the oven cavity.
The convection fan motor receives L1 power
from the selector switch (CV to 3 closing) and
neutral from the power cord.

Service Procedures
©2012 Viking Preferred Service 19
Control
The operation of the oven is achieved by
input from the control to the thermostat. The
control receives power directly from the line
cord. Power is transferred via a N.C. relay to
the thermostat at P7 black wire.
To access the control, slide the unit out 6 to 8
inches. Remove oven selector and thermostat
knobs, remove screws securing thermostat
and selector bezel, unscrew bezel for oven
light switch, remove button for oven light
switch, remove clock buttons, clock knob,
remove screws securing upper trim piece,
screws securing control panel (two at top and
bottom and two on each side). With the
aid of a flat blade screwdriver, separate the
control panel from the inner control panel.
Remove screws securing control to inner
control panel.
Note: Open oven door, and place oven rack
in highest position, and slide rack out. This
will serve as a support for the control panel
during testing and prevent wires from pulling
loose.
Control should have 120 VAC from terminals
L1 (double black wire) to L2/neutral (double
white wire) and should supply 120 VAC to P7
black of thermostat.
Electronic Thermostat
The thermostat controls the temperature to
the oven based on the input received from
the RTD and thermostat knob based on end
users selection. Once the input is received,
the thermostat will
send 120 VAC via P7 red to the selector
switch to perform the appropriate action.
To access the thermostat, slide the unit out
6 to 8 inches. Remove oven selector and
thermostat knobs, remove screws securing
thermostat and selector bezel, unscrew bezel
for oven light switch, remove clock buttons,
clock knob, remove screws securing upper
trim piece, remove screws securing control
panel (two at top and bottom). Remove
control panel and thermostat is accessible.
Note: Open oven door, and place oven rack
in highest position, and slide rack out. This
will serve as a support for the control panel
during testing and prevent wires from pulling
loose.
The thermostat receives supply power input
at P1, 120 VAC at P7 black, thermostat input
at P6, and oven temperature input at P5. The
thermostat sends output power to the selector
switch via P7 red.

Service Procedures
20 ©2012 Viking Preferred Service
Selector Switch DSI Module
The selector switch controls the cooking
operation. When the end user selects a cooking
operation, the corresponding contacts within the
selector switch close supplying L1 to DSI module,
cycle light, or convection fan motor. Switch
contacts BA to 2, BR to 1, and CV to 3 close for
bake, broil, and convection functions respectfully.
To access the selector switch, slide the unit out 6
to 8 inches. Remove oven selector and thermostat
knobs, remove screws securing thermostat and
selector bezel unscrew bezel for oven light switch,
remove clock buttons, clock knob, remove screws
securing upper trim piece, screws securing control
panel (two at top and bottom and two on each
side). With the aid of a flat blade screwdriver,
separate the control panel from the inner control
panel. Remove two screws securing selector
switch to inner control panel.
Note: Open oven door, and place oven rack in
highest position, and slide rack out. This will serve
as a support for the control panel during testing
and prevent wires from pulling loose.
The selector switch receives L1 from the
thermostat P7 Red. Closed contacts BA to 2
supplies L1 power to DSI module position 6 for
bake. Closed contacts BR to 1 supplies L1 power
to DSI module position 7 for broil. Closed contacts
CV to 3 supplies L1 power to convection fan
motor.
The DSI (Direct Spark Ignition) module provides
spark ignition for the oven burners. When the
oven receives an input from the end user, the
selector switch will send a signal to the DSI
module for the appropriate action. Supply voltage,
ground, and polarity is critical for proper operation
of the DSI module. If voltage is below 100 VAC
the flame will not be reliable. If the voltage is
above 130 VAC damage to the DSI Module can
occur. If polarity is reversed, the DSI Module will
not be able to detect the presence of a flame.
Reversed polarity will also prevent the bake and
broil burner from staying lit. The DSI Module
generates a signicant amount of line noise.
This line noise is minimized by clamping it to
ground. The absence of a ground can lead to the
line noise resetting the cooking operation. The
module receives the 120 VAC signal and two
things occur. First, the 120 VAC is used to spark
the oven igniters. Second, through rectication
the 120 VAC is stepped down to between 8
and 18 volts DC. This voltage is sufcient to
open the gas valve and provide gas flow to the
appropriate oven burner. As the gas flow comes
in contact with the sparking igniter ignition occurs.
A monitoring system will look to ensure a flame
is present. If a flame is not present, the igniter
will spark for four seconds. If a flame is still not
present, the igniter will be delayed to allow the
cavity to clear of gas. Once the gas has had time
to clear, the igniter will be allowed to spark again.
This process will continue until a flame is present.
If the oven fails to ignite after three tries,