Atwood 33 WEDGEWOOD RV User manual

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Range
Service
Manual
2015

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INTRODUCTION
The 2015 edition of the Atwood Range Service Manual is a resource created to help service technicians identify
Atwood product by serial number, diagnose service problems and efficiently and effectively process warranty
claims.
Each of the manuals within this series offers a general overview of the product as well as more specific product
information. For the range product within this manual, you will find model identification, sequence of operation,
part identification and troubleshooting guides, warranty procedures, flat rate schedules, and replacement part refer-
ence charts.
Due to the rapidly changing personal computer revolution, we have placed troubleshooting information in a variety
of places to make sure that the most accurate information is available. The best place to find the current informa-
tion about Atwood products is our website: www.atwoodmobile.com. At our website brochures may be
downloaded, troubleshooting guides reviewed and the latest information bulletins can be read. In addition, all At-
wood Authorized Service Centers are listed on our site, accessible via an easy-to-use search system.
Service for all Atwood products is handled our of our Elkhart Indiana location. Should you have any questions
regarding our products or the information contained in this manual simply dial our Toll Free 1-866-869-3118.
Be sure to have the Model and Serial Numbers when you call.
Atwood Service Department

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TABLE OF CONTENTS
INTRODUCTION……………………………………………………………….2
TABLE OF CONTENTS………………………………………………………..3
COOKING APPLIANCE TERMINOLOGY………………………………….4
MODEL NUMBER IDENTIFICATION……………………………………….5
GAS COMPONENT IDENTIFICATION PICTORALS…………………...6-7
SEQUENCEOFOPERATION-MODELS33,34,35,20&21…………...…..8
TROUBLE SHOOTING GUIDE……………………………………… 9-10
INSTALLATION (Ranges & Slide-ins)
Cabinetandcountercut-outrequirements…………………………….11
Recessed bi-fold cut-out requirement…………………………………..11
Electronicignitionschematic……………………………………………11
Rangehoodmountinginformation……………………………………..11
PART DIAGRAMSAND PART NUMBERS (Ranges & Slide-ins)
Model 33, RV/CV and RA/CA…………………………………… ... 12-14
Model34, RV/CVandRA/CA………………………………………15-16
Model35,RV/CVandRA/CA………………………………………17-18
Bi-FoldCoversandcut-outrequirements……………………………..19
INSTALLATION (Drop-ins)
Cabinetandcountercut-outrequirements…………………………….20
PART DIAGRAMS AND PART NUMBERS (Drop-ins)
Covers forDVDrop-inModels………………………………………….20
Model DV20 and DV30………………………………………………….21
WARRANTY……………………………………………………………………22
EXTENDED WARRANTY…………………………………………………….23
ATWOOD RETURN GOODS PROGRAM…………………………………..24
WARRANTY SERVICE REPORT……………………………………………25
FLAT RATE SCHEDULE……………………………………………………..26
INFORMATIONNOTICES

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Cooking Appliance Terminology
Terminology
Definition
Terminology
Definition
ANSI
American National Standard for
Recreation Vehicle Cooking Gas
Appliances
Pilot Orifice
A precision drilled thimble shaped
component that meters gas flow
to the pilot.
Burner Electrode
The spark source to light top
burners with piezo/12 VDC
electronic ignition. Replaceable for
33 range series.
Regulator
Device that reduces the high
pressure from the LP bottles to a
lower pressure for the appliances
Calibration
The condition that determines
whether the thermostat is registering
temperatures properly.
Sealed Burner
A burner head attached directly to
the porcelain main top which
prevents spilling to the burner
box.
CSA
Certification Agency
(Canadian Standards Association)
Standby Pilot
The oven pilot that burns
constantly and provides the base
for the oven burner.
Main Burner
Orifice
A precision drilled thimble shaped
component that meters gas flow to
the main burner.
Thermal Bulb
The bulb located in the oven and
connected to the thermostat that
contains thermal fluid and causes
the thermostat to close and open
based on the set cooking
temperature.
Manifold
The constantly pressurized tube or
pipe that supplies gas to the burner
valves.
Thermocouple
Senses pilot flame for the oven
and controls safety valve and
thermostat.
Oven Thermostat
It is the component that regulates
the temperature of the oven at the
desired cooking temperature and
supplies gas for both the standby
and heater pilots.
Yellow Tipping
A burner flame with excessive
yellow tipping can be caused by
improper gas/air mixture caused
by improper alignment, restriction
of the orifice, or blockage of the
venture tube.
Piezo Ignitor
An electro-mechanical device that
can be used to ignite a top burner.

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4, 5

Range & Oven Gas Components
Harper Wyman
Harper Wyman Oven
Control/Thermostat
Harper Wyman Mini
Burner Valve
Safety Pilot Valve
Ranges whose model number
is
R __8-32 have a complete
Harper Wyman range valve
system.
Cooktops whose model
number is R__8-32 to current
model have a complete Harper
Wyman valve system.
Top burners are Harper
Wyman and linear
Lowest temperature on oven
knob is 170 F.
Oven control and safety pilot
valves are also Harper
Wyman.
This safety pilot valve is no
longer available.
Copreci
Mercury Free
Copreci Oven Thermostat
Burner Valve
Orifice Block Pilot Assembly
Ranges whose model number
is R__33 have a Copreci oven
thermostat with Mueller burner
valves for the stove top.
Lowest temperature on oven
knob is 300 F.
Slide-ins whose model number
is C_3have Mueller burner
valves.
Pilot assembly is White
Rodgers.
BSI
Mercury Free
Oven Thermostat
Burner Valve
Pilot Assembly
Ranges with model numbers
R___34
Lowest temperature on oven
knob is 300F
Burner valve also used in
slide-ins(s) with model
numbers C_34 and C_20
Seven Universe
Mercury Free
Oven Thermostat
Burner Valve
Pilot Assembly
Ranges with model numbers
R___35 and R___21.
Lowest temperature on oven
knob is 300°F.
Burner valve also used in
slide-in(s) with model number
C_35 and C_21.

Gas Regulator — Used in all Atwood Ranges, slide-ins and drop-ins.
Seven Universe
Regulates gas pressure to nominal 10”W.C.
ReplacesallpreviousbrandsincludingHarperWyman,
Maxitrol, Oara, and BSI.
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Sequence of Operation—Models 33, 34 and 35
Standard Pressure Regulator—This valve receives up to
13”W.C. gas pressure from regulated LP systems and re-
duces the pressure to 10” W.C. to the manifold.
Manifold—acontinuallypressurizedpipedistributinggas
to top burner valves and oven thermostat.
Oven Thermostat—supplies gas to the oven pilot, and
main burner; regulates oven temperature.
Pilot Assembly—consists of a thermocouple and a pilot
hood where gas passing through the orifice is directed to-
ward the oven burner pilot holes. The user holds the magnet
in initially by pushing the knob in at the “pilot/push/hold”
rotation and manually lighting the pilot. After approxi-
mately 5 seconds, the thermocouple input will hold the
magnetin the open position and the user can release the
knob and adjust to the desired temperature.
Oven Thermostat - senses oven temperature by means of a
thermal bulb located in the upper rear of the oven. The oven
control knob is set to the desired temperature calling for
heat; the fluid expands in the bulb as the temperature rises,
moving the seat in the thermostat from full open to partial
openasthe desired temperature isreached, thus maintaining
the settemperature.The gasis passed fromthe thermostat
to the orifice block in the main burner, entering the burner
and igniting from the pilot.
Oven Burner—The oven burner remains on once the ther-
mostat is turned on. The size of the flame changes to a high
or low flame by the thermostat as regulated by the user set-
ting the knob and the thermostat bulb sensing a satisfied
oventemperature.
Note: The pilot gas line will remain open as long as the
pilotislightedandthethermocouplesensesflame.Ifthe
pilot goes out, the magnet will drop outand shut off gas
flow to the pilot.
Note: Component
appearance may
vary from model to
model.

Atwood Cooking Appliance
Atwood Mobile Products LLC
1120Nor1hMainStreet •Elkhart, IN46514
PHONE: 574·264·2131 FAX: 574·262·2550
INTERNET : http://www atwoodmobile.com
TROUBLE SHOOTING GUIDE
Effective: 8/7/13
Guides are only intended for use on Atwood•products lby service technicians who have successfully completed
Atwood•training. This guide should be used in conjunction with the appropriate Instruction Manual provided with the
product and any applicable Industry Standards. This is not intended to be a complete list. Please direct questions
concerning service of Atwood•products to 866-869-3118 before proceeding.
CAUSE SOLUTION
RANGE PILOT WON'T LIGHT OR STAY LIT
Insufficient gas pressure---------------
Supply valve closed ------------------------- Turn valve on
Blocked pilot orifice -------------------------- Clean pilot orifice with toothpick
Pilot flame cover out of position ----------- Reposition pilot flame cover, and/or remove carbon and/or coating of carbon
BURNER(S) WON’T LIGHT OR STAY LIT
Insufficient gas pressure ---------------- Check for gas leaks, have system pressure checked by qualified gas technician
Incorrect air/gas mixture------------------ Adjust air shutter if applicable
Blocked orifice ------------------------------ Clean with a toothpick
BURNER LIGHT BUT FLAME IS TOO SMALL
Improper gas pressure------------------------- Check for gas leaks, have system pressure checked by qualified LP gas technician.
Improper air/gas mixture --------------- Adjust air shutter if applicable
Problem burner valve -----------------------Replace burner valve
Blocked orifice ------------------------- Clean with toothpick
BURNER FLAME LIFTS OFF BURNER HEAD
Gas pressure too high --------------------------- Have system pressure checked by a qualified LP gas technician
OVEN BURNER LIGHTS, BUT FLAME REMAINS VERY SMALL AND OVEN HEATS VERY
SLOWLY
Improper gas pressure----------------------Check for gas leaks, have system pressure checked by qualified LP gas
technician.
Blocked orifice --------------------------------Clean with alcohol and cotton swab
OVEN BURNER FLAM E LIFTS OFF BURNER AND OVEN CYCLES TOO FREQUENTLY
Gas pressure too high ---------------------- Have system pressure checked by qualified LP gas technician, or
Improper gas mixture
OVEN COOKS UNEVENLY AND/OR FOOD BURNS ON THE BOTTOM
Poor oven ventilation--------------------------Oven too full for proper circulation- must have 1" clearance in all directions.
Ventilation holes in oven bottom (shelf above burner) are covered. Check
the top vent (back of range) it must be clear of obstructions.
Problem thermostat ------------------------- Replace thermostat.
Oven not preheated ---------------------- Oven must be preheated at least 15 minutes.
Thermo bulb out of position-----------------Thermobulb must be in clip on back of oven –thermobulb should not touch
Pans or oven walls.
1. Check for gas leaks and have system pressure checked by
qualified LP gas technician.
2. Check gas supply
3. Set pressure to 11”W.C. with two or more gas appliances
running.

COOKING APPLIANCE - (continued) Effective: 8/7/13
OVEN PILOT OUTAGE
Safety Thermal Bulb out of position -------Re-position the safety thermal bulb.
Problem thermostat ----------------------------Replace thermostat
Blocked oven vent ------------------------------Remove obstruction from vent
Incorrect oven burner gas/air mixture------Readjust air
YELLOW FLAME TIPS
Improper gas-air mixture ---------------------Adjust air shutter if applicable
Low gas pressure ----------------------------Check gas supply
Check for leaks and have the regulator checked
Set pressure to 11" water column
RA Ranges and Cooktops
Improper orifice to burner alignment -------Realign burner head and orifice tube assembly
Replace orifice
Operation and Trouble Shooting Guide –33 Series and UP
TO LIGHT THE PILOT
Turn the oven knob to the pilot position and push in. Light pilot with a lighter.
Hold in for at least 30 seconds until pilot is well established.
PILOT WILL NOT COME ON
Check to see if the gas is turned on.
Is there gas in the tanks?
Check for blockage of the orifice, pilot assembly, or pilot line.
Check for kinks in the pilot line.
PILOT WILL NOT STAY ON
Hold oven knob ,pilot position, for up to 30 seconds.
Check gas supply.
Confirm that thermocouple Is fully inserted Into the thermocouple holder.
Pilot flame out of position. Pilot flame Is not engulfing thermocouple. Pilot assembly needs to be adjusted so that
pilot flame is engulfing thermocouple.
Test thermocouple.
Thermostat knob is bottoming out on manifold cover (face plate). If knob can’t fully engage, the magnet in the
thermostat will not be established. Move manifold out further beyond face plate.
THERMOSTAT CALIBRATION
The ideal temperature variance is 25 degrees (plus or minus). This means that if the thermostat is set at 350
degrees, the temperature will range between 325 and 375. If the temperature exceeds 50 degrees, plus or
minus, check for a kinked capillary tube.
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