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SERVICE MANUAL

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1. 30 Controller Settings 30 Burner Adjustments tetas 36 Flame Sense Location hehe 39 Flame Sense Current Test 39 F25119 Rev B February 2009 2 of 64 8 BXAGP GAS RACK OVEN Combustion Analysis nhe 39 Drart Inducer Test wit Lay te hs Ba Be Se hel Saeed beeneupIlte Else Ld 40 Hood Vent Draft Pressure Test eects 43 Door ACJUSIMENE IUE Oaths reat REN LONE Rd 43 Door Switch Adjustment 44 Rack Position Switch Adjustment 0 44 Rack Position hm m 44 Rack Height Adjustment pa eens 45 Actuator L brication ee ee ee dig ele he lg SEI eed ee 46 Air and Angle Shutter 0 47 ELECTRICAL OPERATION esege eenen e raeno E TA EE AANE 51 Component Function 0 51 Oven Sequence of Operation 2 52 Burner Sequence of Operation
2. 54 Component Location 55 Wiring Diagrams eia ee eee ete epe eel dee esed 56 OVEN TROUBLESHOOTING herren 61 IGNITION MODULE TROUBLESHOOTING err 63 BURNER TROUBLESHOOTING herr 64 HOBART 2009 Page of 64 25119 Rev B February 2009 8 GAS RACK OVEN GENERAL GENERAL INTRODUCTION General HBA1G BXA1G ovens hold one single rack and HBA2G BXA2G amp BXA2GP ovens hold two single racks or one double rack Oven features Powered rack lift with high temperature bearings and a clutch rotating system designed to stop the rack in the event of a jam without damage to the rotation motor or losing rack alignment Digital programmable controller with optional backup control flush flooring and field reversible bake chamber door All of the information illustrations and specifications contained in this manual are based on the latest product information available at the time of printing Heating The rack oven reaches baking temperatures of 350 F in approximately 20 minutes however a 30 minute preheat is recommended to fully heat the steam generator Steaming System Standard on all rack ovens is a self contained
3. 4 ed Hun c CE 4 Operation dae hd wl ee fie ew d e ardet 4 Cleah zc oue te Fe 4 LUDVICATION 4 Control an ote eb be e ote ee Lb LU eos 4 TOOS eee dere fete pee Dub nt Ced tee eee dub oe gelato ee equ beet 4 HBA1 amp BXA1 Gas Rack Oven Specifications Single Point Venting 5 HBA1 8 BXA1 Gas Rack Oven Specifications Dual Point Venting 7 HBA2 8 2 Gas Rack Oven Specifications Single Point Venting 9 REMOVAL AND REPLACEMENT OF PARTS 11 Steam Panel ERIS wee ae ee ea 11 Rack Rotator Assembly s seein ide kaati ioraa a a oa a a a eee eens 11 Rotator Motor 13 ACLUAIOE punere ais s EEE RAEE E EE Ep E NEL IUBE C E LENS 14 Convection Blower Motor eden 15 wed e Or c da cd 16 Gas Manifold Orifices hen 17 EE Re Date Robe Tae
4. Monitors current to circulation motor Overload OL2 Monitors current to rotator and rack lift motors optional Draft Inducer Motor M3 When energized drives fan to generate draft required for proper burner operation and exhausts combustion products into hood vent Temperature Monitors air temperature in the oven cavity and sends signal to control board Vent Motor M2 When energized operates oven cavity vent Vent Position Switch Allows controller to monitor the oven cavity vent open or closed Rack Position Switch 1 Allows Rack Position Relay to be energized when rack is in load unload position Rack Position Switch 22 Signals rack position to control Switch is operated when the rack is in position for rack removal Centered in door opening Page 51 of 64 F25119 Rev B February 2009 8 BXAGP GAS RACK OVEN ELECTRICAL OPERATION Rack Position Relay CR3 When energized switches power from LS1 to LS2 Has a latching circuit Back Up Relay CR2 If open closes vent on power up when back up controls are used Hood Vent Relay CR1 CR1 Powers roof mounted vent motor and allows ignition module to be reset after a lock out Rack Lift Switch 1 LS1 Allows rack to be raised and rack to turn Rack Lift Switch 2 LS2 All
5. SP Gr 1 52 NATURAL GAS LIQUIFIED PROPANE GAS kCAL HR 75 600 75 600 12 7 25 4 30 5 35 6 1 25 3 50 3 00 3 50 NOTE Pressure not to exceed 35 6 cm W C or 3 5 kPa ELECTRICAL Single supply connection provided 380V 3ph 50Hz 400V 3ph 50Hz or 415V 3ph 50Hz 6 A circuit required 1 kVa Transformer supplied for control and operation voltage of 110V This is a multifunction transformer so output voltage should be verified before operation Oven fan 1 1kW operates 380 415V 3ph 50 Hz 2 4 2 2A HOOD VENT 25 4 cm DIA Connection collar Customer is to supply duct and ventilator fan per federal and or local codes Chamber vent steam and combustion exhaust are discharged into the hood An air proving switch is factory installed and integrated with burner system operation If proper ventilation is not provided burner will not operate Oven provides a relay to activate a customer supplied and powered contactor relay so that when oven is powered up external fan will operate The hood requires a minimum of 25 5 m min for safe operation For fan calculation purposes you should assume 0 15 kPa resistance through the hood Grease filters optional may be installed in the hood instead of standard baffle F25119 Rev B February 2009 8 GAS RACK OVEN GENERAL 10681 1 82 282 48 66
6. 39 CIRCULATION BLOWER PRINTED CIRCUIT VENT MOTOR 5 WATER SOLENOID 10 LIGHTS VENT POSITION 3 INPUT DOOR INPUT 5 SENSOR i T POSITION 52 INPUT SSLIFT CAPACITOR IS INTERNAL TO THE LIFT MOTOR HOBART BAKERY SYSTEMS DERIVED FROM DRAWING NO 01 101505 REV Al 2348 Page 57 of 64 F25119 Rev February 2009 8 GAS RACK OVEN ELECTRICAL OPERATION SCHEMATIC WITHOUT BACKUP CONTROLS EARLY MODELS ONLY OVEN CONDITION FOR SCHEMATIC AS SHOWN OVEN ON DOOR OPEN LIFT IN LOADING POSITION CAVITY VENT CLOSED HOOD VENT OUTPUT SEE DATA PLATE CONNECTOR LEGEND gt lt lt og 14 180 r 2 xx of pins this connector pl yy Pin 8 position zz connector name 11 5 HP OR 2 tph HOODPRESSURE 30 HOBART BAKERY SYSTEMS DERIVED FROM DRAWING NO 01 101506 REV J F25119 Rev B February 2009 58 of 64 8 BXAGP GAS RACK OVEN ELECTRICAL OPERATION OVEN CONDITION FOR SCHEMATIC AS SHOWN OVEN ON DOOR OPEN LIFT IN LOADING POSITION CAVITY VENT CLOSED PUT e ay INPUT 208 240V 50 60 ipn 420V 50 8Q0A ph 208 240 50 60 1 on 3 ph 380V 50 60 3 ph
7. SUPPORT MOTOR DURING REMOVAL 10 Reverse the procedure to install Page 22 of 64 8 GAS RACK OVEN REMOVAL AND REPLACEMENT OF PARTS 11 Check proper operation HBA2 amp BXA2 Early Models Only 1 Disconnect lead wires from motor 2 Remove cover and insulation from draft inducer exhaust duct 3 Disconnect vacuum line from fitting on draft inducer housing 4 Remove screws from housing mounting brackets VACUUM LINE EXHAUST DUCT CENTER OF FAN BLADE 7 Remove screws securing draft inducer motor from housing and remove motor from rear side lt FRONT BRACKET LEFT REAR CORNER OF HOUSING DRAFT INDUCER EXHAUST _ 8 9 1 Manipulate housing assembly to access opening on bottom of housing Loosen draft inducer fan set screw and pull fan blade from draft inducer motor shaft NOTE When installing align center of fan blade with inside edge of exhaust duct Page 23 of 64 gt 2 S Reverse procedure to install Check for proper operation PRESSURE SWITCHES 4 WARNING Disconnect the electrical power to the machine and follow lockout tagout procedures There may be multiple circuits Be sure all circuits are disconnected Open control compartment door to gain access draft inducer vacuum switch and hood vent pressure switch Disconnect l
8. gy 25 0 JON 5 404 wo 922 5 SV9 De 5592 v Tvonmloa1a3 9 6 S tu 6 mmu a de 9 194 0729 D wzo GN M31VM e 0 05 1NIOd 319NIS 12 31713 319NIS 5 3 1 0311915 18 03215 408 3003 NMOHS ONILNSA LNIOd SVS 8 10 of 64 F25119 Rev B February 2009 8 GAS RACK OVEN REMOVAL AND REPLACEMENT OF PARTS REMOVAL AND REPLACEMENT OF PARTS STEAM PANEL Jp AWARNING WARNING Disconnect the Sa S electrical power to the machine and NN v SS follow lockout tagout procedures 2 MS j AS There may be multiple circuits Be s sure all circuits are disconnected Mj NOTE Hand tighten only do not use power tools when installing panel screws 1 Remove screws securing steam panel to baking compartment rear wall through access holes ACCESS SCREWS BAKING COMPARTMENT REAR WALL 2 Remove screws securing steam panel to left baking compartment wall Page 11 of 64 STEAM PANEL REMOVE SCREWS
9. BAKING COMPARTMENT LEFT WALL 3 Remove screws securing steam panel to baking compartment ceiling left rear corner Reverse the procedure to install BAKING COMPARTMENT CEILING STEAM PANEL 4 Reverse the procedure to install RACK ROTATOR ASSEMBLY age WARNING Disconnect the electrical power to the machine and mS 2 follow lockout tagout procedures Ys There may be multiple circuits Be 7 sure all circuits are disconnected Removal 1 Remove rack carrier A Support rack carrier B Loosen set screws C Remove snap ring from end of shaft D Lower carrier to remove Remove rotator and lift assembly cover 3 Remove actuator for rack up and down switches F25119 Rev B February 2009 8 BXAGP GAS RACK OVEN REMOVAL AND REPLACEMENT OF PARTS 4 Disconnect lead wires from rack pointer switches capacitor and rotator motor RACK POINTER SWITCHES 5 rack rotator assembly which will include the rack lift shaft from rack lift assembly NOTE Removal of actuator housing bolt may be necessary for rack rotator assembly removal ACTUATOR HOUSING 7602 Disassembly 1 Loosen set screw and remove rack pointer from shaft 2 Loosen set screws securing the set collar to rotator shaft 3 Remove the split ring from groove in rotator shaft NOTE Remove split ring from shaft as you are removing shaft
10. 0 31 Min 0 23 204 4 W C W C C 7 9 mm W C 5 8 mm W C 0 08 kPa HBA1G BXA1G DUAL POINT VENTING 0 15 W C Cold 400 F 204 4 C 3 8 mm W C 0 04 kPa 4 f minimum reading is not obtained check the draft inducer motor and fan F25119 Rev B February 2009 Page 42 of 64 8 GAS RACK SERVICE PROCEDURES AND ADJUSTMENTS HOOD VENT DRAFT PRESSURE TEST 1 Access the component panel area 2 Verify operation of roof mounted ventilator NOTE Verify plenum or grease filters installed A Remove vacuum line near hood exhaust pressure switch and connect incline manometer or equivalent HOOD VENT PRESSURE SWITCH 1 Single 8 Duel point venting ovens minimum reading should be STANDARD GREASE HOOD 0 0 4 W C 0 6 W C 10 2 15 2 0 10 0 15 0 6 W C 15 2 0 15 NOTE Standard hood reading of 0 3 W C 7 6 mm W C or 0 8 kPa is acceptable if air volume is verified as noted in specifications B Disconnect manometer and reconnect vacuum line onto hood exhaust pressure switch NOTE If vacuum requirements are not met the customer supplied hood vent stack must be modified to meet the above stated requirements and tested until minimum vacuum is met 3 diverter is installed dual point venting 0 4 W C 10 2 mm W C 0 10 kPa co
11. Descriptions This selects either 12 hour AM PM or 24 hours real time display Press the Set for A 12 hour AM PM bake time UP button to switch between Set for 24 24 hour the two types of displays This selects the elapsed time from the Temperature setback time last timed bake to when the oven will in minutes lower the oven set temperature to the value set in P18 This selects the oven set temperature that the oven will change to when the Set 300 F range 50 to temperature setback time has been 300 exceeded P17 Select 1 for lights on continuously when oven is on or select 0 for automatic operation lights will turn off automatically Set for 0 after 30 minutes of no user activity door not opened or closed no buttons pushed Select 1 for Restricted operator mode When a program is selected by the operator the Bake Timer Minutes Set P20 Clock operation Set for 180 range 10 to 180 Setback temperature Lights mode 0 auto operation 1 continuously ON window will display the total bake time of all steps in the program Standard operation only displays the minutes in the selected step When a program is selected and the Start button is pressed the operator cannot make changes to the Set for 0 Restricted operator mode Bake Time remaining or the Oven Set when P20 is changed P7 0 Standard Temp If set for steam steam is settina must be a 21 1 Restricted Operation pro
12. SERVICE MANUAL This service manual includes information from Technical Service Bulletins 1247 1258 1303 1315 amp 1317 These S E V I documents are obsolete and should be destroyed RACK OVEN GAS HBA1G ML 132358 BXA1G ML 132359 HBA2G ML 132280 BXA2G ML 132281 BXA2GP ML 132282 20002 HBA2G MODEL SHOWN NOTICE This Manual is prepared for the use of trained Hobart Service Technicians and should not be used by those not properly qualified If you have attended a Hobart Service School for this product you may be qualified to perform all the procedures described in this manual This manual is not intended to be all encompassing If you have not attended a Hobart Service School for this product you should read in its entirety the repair procedure you wish to perform 10 determine if you have the necessary tools instruments and skills required to perform the procedure Procedures for which you do not have the necessary tools instruments skills should be performed by a trained Hobart Service Technician Reproduction or other use of this Manual without the express written consent of Hobart is prohibited A product of HOBART TROY OHIO 45374 F25119 Rev B February 2009 8 BXAGP GAS RACK OVEN TABLE OF CONTENTS GENERAL E 4 agere
13. 2 Rack centered in door NOTE In some instances when the door is opened the rack may be centered in door CR3 will energize Rack will stay centered in door and then lower 14 15 NO E Rack position switch 2 contacts close Input signals control board that rack is centered in door for the first time since stop button was pushed and door was opened Rack position switch 1 N O contacts close 1 energized thru rack position switch 1 contacts Latching circuit keeps energized if rack would coast past pointer 2 contacts open and rotator motor M4 de energized 3 contacts close and lift motor is energized thru LS2 N C contacts lowering the rack 4 Asthe rack starts to lower LS1 N O contacts open and LS1 N C contacts close When rack is completely lowered LS2 N C contacts open and LS2 N O contacts close Lift motor is de energized Remove rack Shut door and oven will continue to maintain set temperature preheat mode The rack lift will remain in load unload position and not rotate BURNER SEQUENCE OF OPERATION Power 24 to ignition module L1 and A4 lit 24VAC output from control A8 lit to ignition module terminal W and one side of the draft inducer pressure switch Draft inducer motor energized from ignition module terminal F2 115VAC B Inducer pressure switch closes 1 Power to terminal PS Pre Purge cycle
14. If voltage is OK replace gas valve If not replace ignition module HOT SURFACE IGNITOR DE ENERGIZED WHEN If problem persists replace ignition module BURNER ARE LIT YES Check flame sense for damage or short to ground and location N e Check manifold pressure adjust as needed SYSTEM RUNS UNTIL Controll CALL FOR HEAT ENDS PCBs Draft inducer pressure switch malfunction YES e Hood pressure switch malfunction High limit switch malfunction Burner cross over tubes need adjustment NO CALL FOR HEAT ENDS NO Check for proper controller operation SYSTEM SHUTS OFF Remove 1 lead at ignition module If gas valve closes recheck temperature YES controller and wiring If not replace gas valve Check manifold pressure and supply pressure adjust as needed TROUBLESHOOTING ENDS REPEAT PROCEDURE UNTIL TROUBLE FREE OPERATION IS OBTAINED F25119 Rev B February 2009 Printed in U S A
15. Unfortunately new hole locations in bakery floor may be too close to existing holes and make it impossible to drill new holes and adjust door NOTE You may get some movement by adjusting the leveling bolts F25119 Rev B February 2009 8 GAS RACK SERVICE PROCEDURES AND ADJUSTMENTS Adjustment 1 Adjust door hinge inward or outward until door has an air tight seal against door gasket NOTE Remove a door handle spacer if catch is too tight to release from strike If door gasket does not Seal up to 2 spacer can be added If spacers used then ensure interior door handle assembly functions properly DOOR HINGE ADJUSTMENT DOOR ADJUSTED DOOR ADJUSTED AWAY TOWARDS FROM GASKET GASKET 1 0404 DOOR SWITCH ADJUSTMENT Check 1 With door closed door switches are operated 2 When door is unlatched and opened approximately 3 inches at handle side burner should not light and rack should stop in load unload position and lower 3 When closing door door switch actuator must mate with actuator guide on top of door This will raise collar and door switches will return to un operated positions Adjustment 1 Close oven door Bottom of door switch rod should mate with rod guide on top of door to raise door switch actuator Access door switches on top of oven With oven door closed door switch collar should not operate door switches 4 Loosen the do
16. pull heat exchanger to rear of compartment to free front of heat exchanger 11 HBA1G amp BXA1G OVENS T TRANSITION TES CHAMBER 4 ih n LEVELING POST 12 HBA1G amp BXA1G oven remove screws securing heat exchanger tube sections from oven Early modes only have more than 3 Screws Page 19 of 64 HEAT EXCHANGER FLUE STACK REMOVE BOLTS FROM EACH HEAT EXCHANGER TUBE SECTIONS 13 Replace heat exchanger tubes and flue sections as needed NOTE To aid installation of new flue remove draft inducer box and the four exhaust stack retainers REMOVE 14 Reverse the procedure to install F25119 Rev B February 2009 8 BXAGP GAS RACK OVEN REMOVAL AND REPLACEMENT OF PARTS IGNITION MODULE Disconnect the electrical power to the machine and follow lockout tagout procedures There may be multiple circuits Be sure all circuits are disconnected 1 Open the control compartment door to gain access to ignition module Remove control box cover Disconnect lead wires from the ignition module Note Wire locations or refer to wiring diagram 4 Remove screws securing ignition module to oven 5 Reverse the procedure to install 23 Mn CONTROLLER ky A WARNING Disconnect the electrical power to the machine and y mes is follow lockout tagout procedures ASA There
17. spherical cast steam system providing excellent steaming conditions LOCATION Refer to the Installation Instructions for specific location requirements OPERATION Refer to the Operation Manual for specific operating instructions CLEANING Refer to the Operation Manual for specific cleaning instructions LUBRICATION Circulation motor upper and lower bearings rotator chain and lift motor spherical bearing lubricate with high temperature grease every 6 months Lift actuator F25119 Rev B February 2009 Page 4 of Oven has high temperature self lubricating composite bearings on power rack lift shaft no lubrication required CONTROL LOCATION CONTROL PANEL 7 7 j gt w y Hi BURNER ASSEMBLY CONTROLS INSIDE HEAT EXCHANGER COMPARTMENT TOOLS Standard set of hand tools e Oven pressure panel feeler gauge Part No 01 1M5689 1 Do not discard feeler gauge Multi Meter that measures 200 micro amps Grainger No 6MRO9 e Clamp meter No 11541069 Grainger No 1ND81 Temperature tester thermocouple type with 10 probe Manometer U tube Part No TL 84908 or equivalent Grounding kit Part No TL 84919 Jeweler s screw driver set Sears No 00930448000 or equivalent e Combustion analyzer w printer BACHARACH Insight Model 24 8251 or equivalent Order from Bakery Support BACHARACH gas leak detector Or
18. 1 2 NPT 30 75 PSI required 14 PSI max 9 regulator during flow cold water required customer to install in line filter shut off valve and line strainer Q DRAIN 6 1 4 front or 7 rear connection A F F See notes Route to air gap drain Do not slope drain upwards Plug the drain connection that is not in use Rear Drain 1 2 NPTF Front Drain 1 2 NPTF 9 GAS Natural Gas N G 3 4 NPT W C N G N G rated 1025 BTU CU FT SP GR 1 00 Liquified Propane Gas L P G 3 4 W C L P G L P G rated 2440 BTU CU FT SP GR 1 52 NOTE Line pressure must be measured as flow pressure NATURALGAS LIQUIFIED PROPANE GAS BTUIHR 5 0 10 0 12 0 14 0 ELECTRICAL Two supplies required 120 60 1 20 AMP dedicated circuit required VOLTAGE FULL LOAD AMPS 6 8 AMPS 208 240 60 3 4 2 4 4 AMPS 460 60 3 2 1 VENT 8 DIA connection collar Customer to supply duct and ventilator fan per state and local codes Air proving switch factory installed amp integrated with burner system operation Oven provided rely with max 6 amp 1 3 H P 120V output for fan operation If larger use oven relay to control additional separately powered contactor relay for hood fan Chamber vents are factory ducted to this integral hood 600 CFM required 0 4 W C static pressure drop through standard Type 2 hood steam amp heat 690 CFM required 0 6 W C static pressure drop through optio
19. 8 Rotate door such that top of door is at the bottom and install door onto door hinges REMOVE SCREWS _ 2 PLACES TOTAL 9 Use bar from center bottom to install door onto door hinges NOTE Tighten door jamb hinge if left loose to aid installation of door assembly 10 Adjust the door as outlined under DOOR ADJUSTMENT in SERVICE PROCEDURE AND ADJUSTMENTS 11 Install door sweep onto door assembly at bottom of door COVER PLATE F25119 Rev February 2009 Page 28 of 64 8 GAS RACK SERVICE PROCEDURES AND ADJUSTMENTS SERVICE PROCEDURES AND ADJUSTMENTS WARNING Certain procedures in this section require electrical test or measurements while power is applied to the machine Exercise extreme caution at all times If test points are not easily accessible disconnect power and follow lockout tagout procedures attach test equipment and reapply power to test CONTROLLER INPUT OUTPUT STATUS DIAGNOSTIC Turn oven on 2 Check controller input output status indicator LED s on back of controller for proper input output operation during various stages of operation NOTE Use oven sequence of operation in conjunction with diagram CONTROL N 1 INPUT OUTPUT oa9 5 STATUS LIGHTS DAR A4 BURNER POWER INPUT BURNER POWER OUTPUT A9 INTERIOR A5 HOOD RELAY A1 MAIN POWER LIGHTS O
20. BTU Hr W C BTU Hr W C BTU Hr W C 0 180 000 3 5 180 000 10 0 300 000 300 000 sea level 3000 158 400 2 7 158 400 7 7 300 000 300 000 144 000 144 000 280 000 280 000 ORIFICE DIA MUST CHANGE 6500 FT ABOVE SEA LEVEL Orifice 55 Orifice 66 Orifice 52 Orifice 60 129 600 129 600 252 000 252 000 115 200 115 200 224 000 224 000 1 103000 sr 24 2000 ss 8 Turn gas valve off and disconnect manometer Page 37 of 64 25119 Rev B February 2009 9 8 GAS RACK SERVICE PROCEDURES AND ADJUSTMENTS If manifold pressure was unattainable light burner and all other gas equipment on the supply line and check gas supply line flow pressure HBA1G amp BXA1G GAS SUPPLY LINE FLOW PRESSURE NATURAL GAS PROPANE GAS BTU HR 180 000 180 000 5 0 14 0 12 0 14 0 kCAL HR 45 400 45 400 cm W C 12 7 25 4 30 5 35 6 MjHR 1 25 2 50 3 00 3 50 2 amp 2 GAS SUPPLY LINE FLOW PRESSURE NATURAL GAS BTU HR 5 0 14 0 6 0 14 0 12 7 35 6 15 3 35 6 370 317 1 25 3 50 1 50 3 50 2 50 3 50 10 gas set controller to call for heat and check operation of oven CROSS OVER TUBE ADJUSTMENT 1 Remove gas manifold as outlined under GAS MANIFOLD ORIFICES Remove burner rack enclosure front panel Remove screw securing hot surface ignitor t
21. C Cold 5 6 mm W C 0 06 kPa 0 16 W C dd 4 1 mm W C 0 04 kPa 0 46 11 7 mm W C 0 11 kPa 0 32 W C 400 F 204 4 8 13 0 08 41 of 64 MANUFACTURED JULY 2005 PRESENT Natural Gas Propane minimum readings minimum readings 0 22 W C 5 6 mm W C 0 06 kPa 0 16 W C 4 1 mm W C 0 04 kPa 0 46 W C 11 7 mm W C 0 11 kPa 0 32 W C 8 13 mm W C 0 08 kPa F25119 Rev B February 2009 8 GAS RACK SERVICE PROCEDURES AND ADJUSTMENTS Min 0 30 Min 0 23 Min 0 30 W C 7 6 mm W C Min 0 23 HBA2G BXA2G MANUFACTURED PRE MARCH 2005 Oven minimum readings minimum readings Min 0 20 W C Min 0 20 W C cn 5 1 mm W C 5 1 mm W C 0 05 kPa 0 05 kPa Min 0 14 W C Min 0 14 W C 3 6mm W C 3 6 mm W C 0 04 kPa 0 04 kPa Oven minimum readings minimum readings Temp 300k Btu h 350k Btu h 300k Btu h 350k Btu h 75 600 88 200 75 600 88 200 kCAL HR kCAL HR kCAL HR kCAL HR 317 Mj HR 370 Mj HR 317 Mj HR 370 Mj HR 0 35 W C 0 35 W C Cold W C 8 9 mm W C W C 8 9 mm W C 0 10 kPa 0 10 kPa Vertical Draft Motor Oven 300k Btu h Temp 75 600 kCAL HR 317 X MIS ees Min 0 36 W C Cold 10 9 mm W C 9 1 mm W C 0 11 kPa 0 09 kPa 400 F Min
22. Y WS pi L3 Q ONY N33M138 Q3193NNOO SH31N3A 38 OL HOLIMS 38166384 LSNVHXS 310 SNOILO3NNOO NI 318V71 33S N31N3A 2 H2V3 75 NOLLOSNNOO OLNI SHIM 8 9 SYAILNIA OL LINGNOD jus svo 1v201 NMOHS 1NIOd VNOLLVN OL SNOLLO3NNOO 147110 400 310 2 41925 OL LON NMOHS 1 LNIOd SVS LAVH Page 8 of 64 F25119 Rev B February 2009 8 GAS RACK OVEN GENERAL 2 8 2 5 SPECIFICATIONS SINGLE POINT VENTING WATER 1 2 NPT 30 75 PSI cold water required customer to install in line filter shut off valve and line strainer Q DRAIN 2 3 4 front or 5 1 2 rear connection A F F See notes Route to air gap drain Do not slope drain upwards Plug the drain connection that is not in use Kit provided to extend drain to either side of oven Rear Drain 3 4 NPTF Front Drain 3 8 NPTF 9 GAS Natural Gas N G 1 1 4 NPT W C N G N G rate
23. begins 15 seconds Ignition module energizes hot surface ignitor 24 terminal S1 for 4 second heat up time Gas valve energized MV1 two seconds after start of hot surface ignitor cycle Top burner lights and flame spreads to all burners Flame sensor rod is engulfed in flame and a current is rectified between the flame and ground thru the sensor Ignition module requires a steady 1 0 microamp to verify flame presence NOTE Ignition module makes three attempts to achieve ignition 30 seconds inter purge between each attempt If after the three tries for ignition and the burner has not lit there will be an additional 15 seconds purge time After which the ignition module will enter a lock out condition The ignition module utilizes a 3 blink code of the LED for this problem The ignition module will have to be reset by removing power from the ignition module To do this open the door or cycle the main circuit breaker 110VAC to the oven 8 When set temperature is met control removes heat output to ignition module terminal W A lgnition module A8 not lit is de energized 1 Gas valve de energized 2 Draft inducer motor M3 de energized 30 seconds after gas valve de energized B Inducer pressure switch N O contacts open F25119 Rev B February 2009 54 of 64 8 GAS RACK OVEN ELECTRICAL OPERATION COMPONENT LOCATION HBA1G HBA1G HBA2G amp BXA2G COMPO
24. minutes and press start keypad 1 Timer must be set and started within 30 seconds of pushing On Off keypad NOTE If timer is not started in 30 seconds oven will Page 34 of 64 shut down immediately 8 GAS RACK OVEN SERVICE PROCEDURES AND ADJUSTMENTS 2 Oven will start as described in Auto On sequence 3 Oven will operate normally until timer shows 0 00 and no keypads are pressed Oven will shutdown in 15 minutes P17 KOSHER OPERATION MODE The Kosher Mode can only be ordered from the factory and has a key operated manual reset Kosher Lockout Mode automatically locks out controller lock out mode if Kosher parameters are not maintained NOTE Kosher Reset Keys are shipped with the oven located inside the controller box at bottom of box Keys should be provided to facilities approved authority at oven start up 1 Toenable Kosher Enable Mode A Oven controller off B Press and hold the Airflow Delay Arrow keypad while pressing the Power On Off keypad for 3 seconds NOTE A flashing 0 in the Bake Timer Display indicates controller is in the Bakery Mode non Kosher Mode C Press the Bake Timer Up Arrow until display reads 1 enabling Kosher Enable Mode D Press the Power On Off keypad to exit 2 Once oven temperature reaches 200 F 93 C controller will enter Kosher Active Mode and have the following operating characteristics A minimum set
25. of oven in service entrance box 1 Open control compartment door and remove component box cover Disconnect high limit switch lead wires Remove screws securing high limit switch to component box or service entrance box SERVICE HIGH LIMIT ENTRANCE BOX CAPILLARY TUBE TO TOP OF OVEN HIGH LIMIT THERMOSTAT Page 21 of 64 4 Access high limit probe at top of oven 5 Remove screws securing probe cover 6 Remove high limit probe fitting from oven and pull high limit out To install 1 Install high limit in component box 2 Connect lead wires to high limit 3 Route high limit capillary tube to top of oven 4 Mark 12 from end of probe 5 Insert male compression fitting onto high limit probe 6 Install female fitting into center probe location 7 Insert 12 of high limit probe into oven Ensure that high limit probe goes through both inner and outer walls of oven NOTE Remove vent lid to aid in feeling for high limit probe protruding down through oven 8 Install first set of 3 spacers into high limit fitting 9 Pack seal gasket material around probe into high limit fitting 10 Insert second set of 3 spacers into high limit fitting 11 Tighten male compression fitting against second set of spacers to secure high limit probe FEMALE SEAL SECOND SET OF 3 SPACERS FIRST SET COMPRESSION 3 SPACERS FITTING
26. to the machine and follow lockout tagout procedures SIS There may be multiple circuits Be 47 S sure all circuits are disconnected 1 Remove screws securing vent motor cover from vent motor box THERMOSTAT BACK UP SYSTEM ONLY hy AWARNING WARNING Disconnect the Se electrical power to the machine and gt follow lockout tagout procedures D There may be multiple circuits Be 22 sure all circuits are disconnected 1 Open control compartment door to gain access to backup thermostat Remove component panel cover Remove screws securing back up system panel from control box 4 Disconnect lead wires from backup thermostat Remove screws securing thermostat from backup system panel VENT SWITCH COMPONENT PANEL BACKUP THERMOSTAT 6 Access the thermostat bulb at top of the oven 7 Remove screws securing probe cover from oven 8 Remove compression fitting and remove thermostat bulb 2 Disconnect lead wires from vent switch 3 Remove screws securing vent switch from vent bracket 4 Reverse procedure to install Page 25 of 64 PROBE COVER m THERMOSTAT BULB BACK UP CONTROLS F25119 Rev B February 2009 8 GAS RACK OVEN REMOVAL AND REPLACEMENT OF PARTS To install 1 Install backup thermostat in component panel Connect lead wires to high limit Route thermostat capillary tub
27. towards thrush washer before the shaft is beyond the support bracket 8 Install clutch disk DRIVE SPROCKET 9 Install set collar with counter bore edge towards clutch and slide split ring onto shaft A Position set collar so set screw can be secured onto flat of rack lift shaft 10 Install split ring into groove of rotator shaft Page 13 of 64 EY BY RING ANTI ROTATION PIN 11 Insert rotator shaft through female half of spherical bearing in lift arm 12 Apply high temperature grease to drive chain 13 Lower rotator assembly Rotator shaft will align with bearings in rotator shaft housing NOTE Anti rotation pin on rotator assembly must mate with anti rotation slot in lift arm 14 If removed earlier install actuator housing screw and actuator for rack up and down switches 15 Install rack pointer onto rotator shaft 16 Install rack carrier 17 Adjust rack pointer as outlined under RACK POINTER ADJUSTMENT in SERVICE PROCEDURES AND ADJUSTMENTS 18 Adjust rack height as outlined under RACK HEIGHT ADJUSTMENT in SERVICE PROCEDURES AND ADJUSTMENTS 19 Check for proper operation ROTATOR MOTOR WARNING Disconnect the amp electrical power to the machine and follow lockout tagout procedures 27 ns S There may be multiple circuits Be 27 lt sure all circuits are disconnected Removal 1 Block the rack rotator assembly in a position to access the
28. yy Pin position a ROLL OUT SWITCH ZZ connector name gt NOT ON EVERY OVEN INDUCER T E MOTOR gt 4 FROM CONTROLLER 13 1 ae 4 3 2 if TO GND CONTROLLER 24 wil 8 wis CR1 ps 55 INDUCER qus HOOD VENT IGN 52 4 25 28 CONTROL 12 SENSO RESET RELAY COIL SHOWN ON 16 YE 24VAC 81 SCHEMATIC M 24 IGNITOR 9169 LIFTER RACK VENT DOOR SWITCHS amp COMPONENTS WIRING DIAGRAMS 25 NC Upper lift 12 Door SPDT 40 ies 9 O 33 Door DPOT 5 switch 2 NO 4 NC 12 ei us 4 3 RACK POSITION RELAY LIFTER MOTOR CAPACITOR WIRE 53 RED WIRE 23 WIRE 20 BLACK WIRE 25 WHITE WHITE WIRES SHAFT ROTATION VIEWED FROM TOP OF OVEN SHAFT CLOCKWISE SHAFT COUNTERCLOCKWISE ROTATOR MOTOR ROTATOR MOTOR RED WIRE 20 RED WIRE 53 BLACK WIRE 53 BLACK WIRE 20 WHITE WHITE WIRES WHITE WHITE WIRES F25119 Rev B February 2009 Page 60 of 64 8 GAS RACK OVEN TROUBLESHOOTING TROUBLESHOOTING 82 Facilities main circuit breaker open Oven completely inoperative No display on control Oven does not operate Display lit or display flashing and oven cavity lights on Oven does not operate Display shows Shdn shutdown in the bake timer display and flashes the Oven Temp disp
29. 173 C Test with oven at desired operating temperature for 15 minutes D wheels drag then oven floor or racks do not meet manufactured specifications F25119 Rev B February 2009 ACTUATOR LUBRICATION 1 Access actuator on top of oven 2 There are two places to apply high temperature grease A Remove actuator housing cover 1 Apply high temperature grease in actuator gear box GREASE ACTUATOR GEARBOX 1 2 Install actuator housing cover B Remove motor and gearbox assembly from actuator 1 Apply high temperature grease in top of actuator housing E GREASE ACTUATOR HOUSING amp 8701 2 Install motor and gearbox assembly 3 Check for proper operation Page 46 of 64 STATIONARY SIDE STATIONARY SIDE HBAG BXAG amp BXAGP GAS RACK OVEN SERVICE PROCEDURES AND ADJUSTMENTS AIR AND ANGLE SHUTTER ADJUSTMENTS HBA1G amp BXA1G RACK OVENS SHUTTER ANGLE SETTING 19 51 z 16 19 4 22 AS ss SHUTTER 2527 ADJUSTMENT SCREWS 3 28 VN FACTORY SETTINGS gt GAUGE FOR STANDARD OVENS 25 8 49 lt SHUTTER ANGLE 29 8 5 119 5 wb 3 E 27 GAUGE FOR IPE VA ork lt giie o SHUTTER d AIR VOLUME d 33 gt i38 TOP VIEW 8 25 PRESSURE PANEL FRONT VIEW PRESSURE PANEL Al 1505 HBA2 amp BXA2 RACK OVENS S
30. 2 Verify proper operation F25119 Rev B February 2009 A When in Set Back Mode the damper should not open Advanced Energy Saving Mode Operation 1 Auto On Time will start the oven automatically at the set time chosen to a preset set temperature P2 default 375 F A Oven will not start up unless 1 Loading door is closed 2 Hood system is operating gas units only Typical hood systems are wired to turn on automatically when oven powers on Controller will set timer for 60 minutes and start timer When timer times out showing 0 00 and buzzer sounds the oven is ready to use The operator may change the desired temperature or time Set Back Function P17 amp P18 A Set Back time P17 is set to 15 minutes 1 Time shows 0 00 and no other keypads are pushed for 15 minutes controller will automatically set temperature to 2509 P18 Oven will beep twice Vent damper should remain closed while in Set Back Mode Exit Set Back Mode 1 Settemperature to required bake temperature 2 Settimer for 12 00 minutes Press start 3 When buzzer sounds oven is ready for use Auto off Time shuts down the oven automatically at the preset time A B If time is remaining on timer counting down oven will not shut down Once timer shows 0 00 the oven will shut down in 15 minutes P17 Operator can start oven while in Auto off Time by pressing the On Off keypad set timer to a minimum of 30
31. 440V AB0V 50 80 3 ph UNEINPUT NEUT INPUT NEUT lt lt yy yyzz 14 180 Xx of pins this connector yy Pin position wA 2 12 connector CIRCULATION 1 BLOWER MOTOR STD 80 32 UNITS 4 1 5 OR 2 HP 1ph 32 80 ET GAS DVENS ONLY Act HOOD PRESSURE 2HE T 20 Bo cat m T 31 Se HEAT TO HEATER CIRCUIT LIFTER ROTATOR PCE GND 120V M INPUT INTERIOR LIGHTS me 4 CIRCULATION CIRCULATION y BLOWER MOTOR BLOWER t 15 MBU WATER E TT 9 SOLENOID 2 3 0 VENT WATER MOTOR SOLENOID 10 auFT LIGHTS POSITION INPUT E SLIFT DOOR INPUT SENSOR FOSITION 52 INPUT SIFT SALIFT CAPACITOR 15 INTERNAL THE LIFT MOTOR HOBART BAKERY SYSTEMS DERIIVED FROM DRAWING NO 01 101506 REV L 59 of 64 25119 Rev B February 2009 8 BXAGP GAS RACK OVEN ELECTRICAL OPERATION HEATING CIRCUIT BURNER 4 2HEAT 30 120 vacs CONNECTOR LEGEND Z 4 1HEAT 2 ii lt lt xx yyzz eg 14 18U lt 32 24 xx of pins this connector BREAKER ROLL OUT eet a SWITCH
32. 7 97 2 GAUGE FOR COSTCO OVENS ONLY lt 5 lt SHUTTER ANGLE 36 41463 41 5 o Sa 8 z GAUGE FOR a te 8 17440 gt AIR VOLUME 411 44 3 27744 90 97 TOP VIEW 4518 dla PRESSURE PANEL FRONT VIEW PRESSURE PANEL F25119 Rev B February 2009 Page 48 of 64 8 GAS RACK SERVICE PROCEDURES AND ADJUSTMENTS STATIONARY SIDE HBA2G amp BXA2G RACK OVENS SHUTTER ANGLE TOP VIE _ SETTING PRESSURE PANEL 907 97 7 50 75 ___8 47 EN SHUTTER ADJUSTMENT 56 47 SCREWS 56 l 50 gt 4B HHCY A FACTORY SETTINGS ON 50 2 53 0 OVENS BUILT BEFORE 44 E lt EN SEPTEMBER 6 2005 m Hlc x SHUTTER ANGLE 47 44 NO 4 1 5 11 35 amp A 8 35 5 35 11 485 35 35 GAUGES FOR 41 45 ___5 4 35 SHUTTER FRONT VIEW AINE PRESSURE PANEL 9017 General Information 1 Factory settings are used for a starting point on a new oven Once an oven has been started up and has baked satisfactorily there is no need to return to factory settings The illustrations show factory settings for air volume and shutter angles These settings will be applicable for most situations If these settings are adjusted record the settings and place in the control panel area
33. 7747 12 Install probe cover 13 Check oven for proper operation F25119 Rev B February 2009 8 GAS RACK OVEN REMOVAL AND REPLACEMENT OF PARTS DRAFT INDUCER MOTOR 4 WARNING Disconnect the 22 S electrical power to the machine and follow lockout tagout procedures There may be multiple circuits Be sure all circuits are disconnected HBA1 amp BXA1 Ovens and HBA2 amp BXA2 Later Models Only 1 Access draft inducer box from top of oven 2 Remove vacuun line from fitting on draft inducer housing 3 Remove screws securing draft inducer exhaust duct amp collar to hood 4 Remove screws securing draft inducer cover to EXHAUST DUCT amp COLLAR 5 Remove screws securing draft inducer motor flex conduit clamps from oven DRAFT INDUCER MOTOR CONDUIT t or ieu id bua A 6 Remove screws securing draft inducer box and lift box from oven F25119 Rev B February 2009 NOTE Make note of dimension that draft inducer fan blade is located on motor shaft for installing fan blade on to new motor 7 Loosen set screw securing fan blade from draft inducer motor shaft MARK FAN BLADE LOCATION ON MOTOR SHAFT 8 Disconnect lead wires from draft inducer motor 9 Remove screws securing draft induce motor from draft inducer box EN REMOVE SCREWS 4 PLACES
34. 9 Rev B February 2009 62 of 64 8 GAS RACK OVEN TROUBLESHOOTING IGNITION MODULE TROUBLESHOOTING SYMPTOM POSSBLECAUSES O Diagnostic LED continuous ON Ignition control 5 Ignition control module malfunction powered but module does not have outputs at Incorrect ignition module appropriate times Incorrect wiring 1 No draft inducer output 2 No gas valve output 3 No ignitor output Diagnostic LED 1 flash Airflow fault Module doesn t have draft inducer pressure switch input Draft inducer pressure switch inoperative Draft inducer pressure switch tubing malfunction Draft inducer fan blade damaged or inoperative Draft inducer motor malfunction Incorrect pressure switch wiring Incorrect wiring gt a Diagnostic LED 2 flashes Flame no call for Gas valve malfunction heat NOTE Flame continues after controller set temperature is satisfied Gas valve sticks open Diagnostic LED 3 flashes No flame sense Flame sensor rod not positioned correctly or after trial for ignition 3 attempts malfunction Insufficient flame current Ignitor malfunction Gas valve inoperative or improperly adjusted Late ignition check gas manifold pressure Improper flame propagation flame produced check orifice alignment and cross over tube adjustment LED DIAGNOSTIC INDICATOR CODES LED LED off No Faul
35. AS SHOWN OVEN ON DOOR OPEN LIFT IN LOADING POSITION CAVITY VENT CLOSED 3 150 6011 ph 42050 80 ph 208 240 150 601 3 ph 380 440V 50 60 3 ph OUTPUT SEE DATA PLATE 480V 50 60 3 ph LINE INPUT aca HH 811 1 5 3 OR 2 1ph TO HEATER CIRCUIT HOBART BAKERY SYSTEMS DERIVED FROM DRAWING 01 101505 REV J 1513 F25119 Rev B February 2009 56 of 64 8 BXAGP GAS RACK OVEN ELECTRICAL OPERATION OVEN CONDITION FOR SCHEMATIC AS SHOWN OVEN ON DOOR OPEN LIFT IN LOADING POSITION CAVITY VENT CLOSED lt INPUT zo JNPUT x JNPUT 208 240V 50 GOlph 208 240 50 60 1 ar 3 ph IU 380 50 60 3 ph 840 480 150 60 3 ph UNEINPUT NEUT L pi IAEA uS 1 ACT Act CONNECTOR LEGEND 8 lt lt eq 14 180 of pins this connector Pin position z2 connector CIRCULATION BLOWER MOTOR 50 32 15 HP OR 2 HP 1 GAS OVENS ONLY al HOOD PRESSURE St eat HOOD IGN CONTROL RESET RELAY HEAT OUTPUT MEAT 14 INPUT ROTATOR PCB GND o 30 4 1 TO HEATER CIRCUIT 4 3 INTERIOR LIGHTS CIRCULATION A BLOWER MOTOR WATER pl re WATER ol 551580 lodi
36. B February 2009 GAS VALVE Disconnect the amp electrical power to the machine and gt follow lockout tagout procedures 52 There may be multiple circuits Be lt sure all circuits are disconnected 7 5 off the gas before servicing the unit WARNINGAIAII gas joints disturbed during servicing must be checked for leaks Check with a soap and water solution bubbles Do not use an open flame A CHECK ALL JOINTS PRIOR TO THE GAS VALVE SOLENOID BEFORE LIGHTING UNIT B CHECK ALL JOINTS AFTER TO THE GAS VALVE SOLENOID AFTER THE UNIT IS LIT 1 Open control compartment door to gain access to gas manifold assembly 2 Disconnect the gas supply union fitting from gas manifold assembly NOTE The burner mounts may have to be loosed to allow the gas valve to rotate 3 Remove the valve from the burner manifold BURNER MOUNTS Reverse procedure to install Check gas pressure as outlined under GAS PRESSURE SETTINGS in SERVICE PROCEDURES AND ADJUSTMENTS 6 Operate oven and check for proper operation Page 16 of 64 8 GAS RACK OVEN REMOVAL AND REPLACEMENT OF PARTS GAS MANIFOLD ORIFICES There may be multiple circuits Be sure all circuits are disconnected WARNING Shut off the gas before servicing the unit WARNING AII gas joints disturbed during servicing must be checked for leaks Chec
37. EM protocol compliant communication Set for 0 NOTE If P21 is set to 1 and control is programed for Auto On Auto Off oven will not start up in Off Time Mode unless a minimum of 30 minutes is entered into timer within 30 seconds of pressing On Off keypad After oven is started up and timer displays 00 for time and no keypads are pressed for the Set Back Time used inP17 the oven will then shut down NOTE Before restarting oven power switch and gas valve must be OFF for a minimum of 5 minutes 5 Press On Off to exit set up mode 6 Check for proper operation BAKERY MODE The Bakery Mode is the default setting The value for parameter P14 is 0 and displayed in the Bake Timer display In Bakery Mode the controller will only initiate one steam cycle for the set steam time FOOD SERVICE STEAM MODE The food service steam mode has been updated to provide steam at intervals throughout a bake cycle The length of the steam cycle and the interval between cycles can be set by the operator Steam Timer Display will display the steam cycle length and the displayed cycle length will not count down while steaming 1 To enable food service mode A Oven controller off B Press and hold the Start keypad while pressing the Power On Off keypad for 3 seconds C Press the Set Timer Arrows to select parameter P14 D Enable Food Service Steam Mode by pressing the Bake Timer Up Arrow until display changes to a three digit number Set de
38. HUTTER ANGLE SETTING 69 F E 69 K 69 lt 63 NAS SHUTTER 50 117 117799 ADJUSTMENT lt SCREWS gt 83 18 8 SETTINGS 52 ON OVENS BUILT AFTER z E BARE TOR SEPTEMBER 6 2005 82 2 62 lt SHUTTER ANGLE 44 i5 371 44 5 3 lt GAUGE FOR lt SHUTTER VOLUME 67 4 35 3 1 038 22 3L 35 PRESSURE PANEL FRONT VIEW PRESSURE PANEL AI 1763 Page 47 of 64 25119 Rev B February 2009 8 GAS RACK SERVICE PROCEDURES AND ADJUSTMENTS HBA2G amp BXA2G RACK OVENS PANERA BREAD SETTINGS SHUTTER ANGLE SETTING WALL 56 11 36 50 50 gt SHUTTER 47 9 ADJUSTMENT SCREWS gt 80 21 50 Ne 2 FACTORY SETTINGS ON o x 4 gt GAUGE FOR NER BREAD OVENS lt lt SHUTTER ANGLE 63 63 z 6 44 TR 5 388 E al GAUGE FOR 3227 177 35 0 SHUTTER AIR VOLUME 4 32 38 H M TT 38 TOP VIEW 35 J 38 PRESSURE PANEL FRONT VIEW PRESSURE PANEL HBA2G amp BXA2G RACK OVENS COSTCO SETTINGS SHUTTER ANGLE _f SETTING WALL Jf m 44 44 90 90 44 ld 44 SHUTTER ARTA ADJUSTMENT 90 90 X SCREWS gt 660118 FACTORY SETTING gt 90
39. Meter reading should be a steady 1 0 microamps or higher If not troubleshoot flame sense circuit Page 39 of 64 NOTE If reading is below 0 microamps reverse meter leads and take another reading COMBUSTION ANALYSIS 1 Verify the manifold pressure as outlined under BURNER ADJUSTMENTS 2 Insert combustion analyzer meter 8 into air sampling tube at 300 F for combustion tests NOTE For early single point venting only air sampling tube is inside control compartment To ensure an airtight seal around analyzer tube use a perm gum grommet for an accurate O and CO readings HBA2G amp BXA2G OVEN SINGLE POINT VENTING INSERT ANALYZER TUBE INTO AIR SAMPLING TUBE i R IAI DRAFT INDUCER PRESSURE SWITCH 20 amp BXA2G OVEN SINGLE POINT VENTING 72287 1 Zz weet es INSERT PROBE HERE F25119 Rev B February 2009 8 GAS RACK OVEN SERVICE PROCEDURES AND ADJUSTMENTS NOTCH IS STANDARD POSITION FOR 3000 000 BTU HR OR 75 600 kCAL HR OVEN DUAL POINT VENTING System Vent Pipe Customer Supplied Draft Diverter Insert Combustion Analyzer Meter DRAFT INDUCER BAFFLE ADJUSTMENT SCREW Draft Inducer DRAFT INDUCER TEST 1 Access the component panel area for single SINGLE POINT VENTING point venting and for dual point venting access INSERT PROBE HERE draft diverte
40. NENT LOCATION RACK POSITION SWITCHES CIRCULATION FAN MOTOR CONTROLLER TEMPERATURE SENSOR HIGH LIMIT THERMOSTAT N VENTMOTOR DRAFT INDUCER DRAFTINDUCER PRESSURE SWITCH GAS VALVE HOOD PRESSURE SWITCH HOT SURFACE GNITOR _ CONTROL BURNER ASSEMBLY COMPARTMENT 5 FLAME SENSOR E 7 CONTROL COMPONENTS VENT RELAY gi IGNITION CONTROL MODULE TRANSFORMER f BACK UP qo THERMOSTAT BACK UP _ SWITCH BACK UP RELAY 4 BACK UP N STEAM SWITCH S H lt S WATER SOLENOID ROTATOR MOTOR DOOR SWITCH Al 2374 CIRCULATION FAN MOTOR VENT MOTOR DRAFT INDUCER MOTOR DRAFT INDUCER PRESSURE SWITCH GAS VALVE HOOD PRESSURE SWITCH 328 gt ROLL OUT SWITCH HOT SURFACE CONTROL zh COMPARTMENT BURNER ASSEMBLY DOOR FLAME SENSOR HOOD VENT RELAY OLA 2 CONTROL COMPONENTS IGNITION CONTROL MODULE TRANSFORMER 4 BACK UP SWITCH sexe p HERMOSTAT RELAY BACK UP STEAM SWITCH Page 55 of 64 F25119 Rev B February 2009 8 BXAGP GAS RACK OVEN ELECTRICAL OPERATION WIRING DIAGRAMS SCHEMATIC WITH BACKUP CONTROLS EARLY MODELS ONLY OVEN CONDITION FOR SCHEMATIC
41. NGS Timer Settings Shown In Maximum temperature set This is the maximum temperature at Set for 525 F range 50 to point which the oven can be set 525 F This is the default temperature set point when the oven is first turned on program Set for 375 F range 50 to 0 The preheat temperature cannot be 525 F set higher than the value in P1 Preheat temperature Minimum temperature set This is the minimum temperature at Set for 50 F range 50 to This value adjusts the temperature Heat OFF offset difference between the set point and Default setting 2 range 20 stopping the heating system This value adjusts the temperature difference between the on temperature Default setting 4 range 0 to and off temperature of the heating 20 system Heat difference hysteresis This value permits an offset or correction Temperature offset between the temperature probe and the Default setting 0 range 50 real baking chamber temperature 1 2 i point which the oven can be set 20092 P4 P5 7 the STEAM TIMER operation set for 1 restricted operator mode 25 c 0300 temperature in Fahrenheit or Celsius The BAKE TIMER cab be set up to Bake time mode display minutes set minutes remaining or 0 minutes 1 hours 8 hours and minutes Select 0 for minutes Set for 0 minutes set minutes remaining or 1 for hours and minutes Vent evacuate time in Time set is the time in seconds that the P10 vent is 10096
42. NHEIT CELSIUS RANGE 1 8 to 1 2 30 349 45078 40 204 750106 5 f multi meter reading indicates an open or is outside the millivolt range replace the temperature probe as outlined under TEMPERATURE PROBE F25119 Rev B February 2009 8 GAS RACK OVEN SERVICE PROCEDURES AND ADJUSTMENTS CONTROLLER TEMPERATURE CALIBRATION NOTICE Certain components in this system are subject to damage by electrostatic discharge during field repairs field service grounding kit is available to prevent damage The field service grounding kit must be used anytime the control board is handled 1 Check setting of controller temperature offset P4 as outlined under CONTROLLER DEFAULT SETTINGS 2 Verify that the probe is functioning properly as outlined under TEMPERATURE PROBE TEST 3 Place thermocouple of a temperature tester in the center of right incoming air slot of the bake chamber A Route thermocouple through hinge side of door to the outside of the oven Make sure that the lead wire is kept clear of the rack carrier 4 controller temperature to 400 F Allow the oven temperature to stabilize minimum 3 cycles 6 Note temperature reading on temperature tester and controller at the exact time the heat light on the controller goes out 7 the temperature difference between the two readings is greater than 2 F or 1 C adjus
43. URAL GAS PROPANE GAS 180 000 Propane Gas 180 000 200 25 200 2540 2 amp 2 MANIFOLD PRESSURE NATURAL GAS PROPANE GAS 300 000 BTU HR 350 000 BTU HR 300 000 BTU HR 350 000 BTU HR 3 0 kCAL HR 75 600 88 200 75 600 88 200 015 2032 317 317 kPa NOTE The following diagrams represent two typical styles of combination valves The valve you are servicing may not match the diagrams PRESSURE REGULATOR WIRING ADJUSTMENT UNDER TERMINALS 2 CAP SCREW OUTLET PRESSURE TAP GAS CONTROL KNOB 5770 PRESSURE REGULATOR OUTLET ADJUSTMENT UNDER PRESSURE CAP SCREW TAP INLET PRESSURE TAP INLET ouTLET WIRING GAS CONTR L KNOB TERMINALS 2 7297 F25119 Rev B February 2009 Page 36 of 64 8 GAS RACK SERVICE PROCEDURES AND ADJUSTMENTS NOTE The following chart is for reference only If the manifold pressure must be adjusted to accommodate the altitude you must contact Bakery Product Support for a corrected data plate ALTITUDE CORRECTION CHART HBA1G BXA1G HBA1G BXA1G HBA2G BXA2G 20 20 Natural Gas Propane Gas Natural Gas Propane Gas IN FT Orifice Dia 0 0595 Orifice Dia 0 037 Orifice Dia 0 073 Orifice Dia 0 046 Oven Manifold Oven Manifold Oven Manifold Oven Manifold Rating Pressure Rating Pressure Rating Pressure Rating Pressure BTU Hr W C
44. UTPUT OUTPUT INPUT A10 WATER VALVE CIRC FAN A2 DOOR INPUT QUTPUT AT VENT MOTOR A3 VENT SWITCH LIFT OUTPUT OUTPUT 1598 3 Correct any improper input output operation 4 Check oven for proper operation IGNITION MODULE SELF DIAGNOSTICS Ignition module makes three attempts to light burner before proceeding to lock out mode 1 oven on and set controller to call for heat 2 Access the ignition module by removing component panel cover 3 Check ignition module indicator LED for fault codes as stated in following chart NOTE LED will briefly illuminate during pre purge LED DIAGNOSTIC INDICATOR CODES LED CODES LED off No Fault Control Fault 1 Flash Air Flow Fault 2 Flash Flame No Call For Heat 3 Flash Ignition Lockout Page 29 of 64 NOTE Flame continues after controller set temperature is satisfied Gas valve sticks open 4 Disconnect power to oven 5 Correct the fault 6 power 7 Check ignition module for correct operation TEMPERATURE PROBE TEST Access controller board 2 Disconnect temperature probe lead wires from controller board 3 Setthe multi meter to milli volt scale and connect positive lead red to the white probe lead wire and negative lead black to red probe lead wire 4 Verify the multi meter reading to the temperature conversion chart as follows TEMPERATURE CONVERSION CHART MILLIVOLT FAHRE
45. be multiple circuits sure all circuits are disconnected NOTICE Certain components in this system are subject to damage by electrostatic discharge during field repairs A field service grounding kit is available to prevent damage The field service grounding kit must be used anytime the control board is handled 1 Open the control compartment door to gain access to controller F25119 Rev B February 2009 2 Remove controller rear cover BACK SIDE OF CONTROL CABINET DOOR l P Em LL m a cA oen 4 CONTROLLER COVER 8124 3 Disconnect all control harness connections NOTE Ovens with Kosher operation will have a connector for the key lock switch to be disconnected 4 Remove nuts and washers securing controller to controller panel DISCONNECT LEAD WIRES Page 20 of 64 8 GAS RACK OVEN REMOVAL AND REPLACEMENT OF PARTS NOTE When installing ensure stand off spacers are installed behind controller board 5 Reverse the procedure to install 6 Check oven for proper operation HIGH LIMIT SWITCH WARNING WARNING Disconnect the 90 Social power the machine and Fa e gt follow lockout tagout procedures IS AS There may be multiple circuits Be amp sure all circuits are disconnected NOTE On HBA1G amp BXA1G oven access high limit Switch at top
46. cedures AS There may be multiple circuits Be sure all circuits are disconnected 1 Block the rack rotator assembly from moving Disconnect lead wires to actuator motor Remove top actuator mounting brackets from rack lift assembly 4 Align bottom actuator arm pin with access hole in side of rack lift assembly beam Page 14 of 64 8 GAS RACK OVEN REMOVAL AND REPLACEMENT OF PARTS ACTUATOR PIN ACCESS HOLE Z RACK LIFT 27 ASSEMBLY BEAM Block rack lift arm to preveni movement Remove actuator pin from the assembly and remove actuator from rack lift assembly 7 sure replacement actuator is fully retracted Turn end of actuator arm CCW 12 complete turns NOTE Measure end of actuator arm to bottom of actuator arm housing measurement should be approximately 2 1 2 ACTUATOR ASSEMBLY Install lower actuator arm pin through lift pin Position the rack rotator assembly so the top actuator mounting brackets will align with the rotator assembly 10 Reconnect lead wires 11 Putoven into use and check for proper operation Page 15 of 64 CONVECTION BLOWER MOTOR Ww Disconnect the electrical power to the machine and 578 follow lockout tagout procedures Do There may be multiple circuits Be 47 sure circuits are disconnected NOTE To follow this procedure there must be 24 of clearance at the top
47. crease opening of shutter to prevent air volume depletion 3 Decrease shutter opening in area where the product is dark and adjust the shutter only 1 32 of an inch ata time 4 n some cases it will be applicable to increase shutter openings where the product is light If recommended by Bakery Product Support 5 Validate adjustments by performing a test bake with the same type of product Shutter Angle Adjustment The revised inner pressure panel design perforated inner pressure panel behind the air shutter panel on HBA2G amp BXA2G Rack Ovens built after September 6 2005 reduces the need for shutter angel adjustments Make corrections with air volume adjustments before making any angle adjustments Changes to the factory shutter angle settings should only be made to correct specific baking issues that air volume adjustments cannot correct contact Bakery Product Support for assistance Ovens prior to September 6 2005 requiring shutter angle adjustments refer to diagram HBA2G amp BXA2G RACK OVENS FACTORY SETTINGS ON OVENS BUILT BEFORE SEPTEMBER 6 2005 in this service manual F25119 Rev B February 2009 50 of 64 8 BXAGP GAS RACK OVEN ELECTRICAL OPERATION ELECTRICAL OPERATION COMPONENT FUNCTION Controller Controls oven operation Transformer Supplies 24VAC to ignition module and controller Door Switch 41 Used with back up contro
48. d 1025 BTU CU FT SP GR 1 00 Liquified Propane Gas L P G 1 1 4 NPT W C L P G L P G rated 2440 BTU CU FT SP GR 1 52 NATURAL GAS LIQUIFIED PROPANE GAS BTU HR 300 000 350 000 300 000 350 000 ELECTRICAL Two supplies required 120 60 1 20 AMP dedicated circuit required and one of the following voltage options VOLTAGE 220 60 1 6 8 AMPS 208 230 60 3 4 4 4 2 AMPS 460 60 3 2 1 HOOD VENT 10 DIA connection collar and optional 10 to 8 DIA duct adapter provided Air proving switch factory installed amp integrated with burner system operation Oven provided rely with max 6 amp 1 3 H P 9 120V output for fan operation If larger use oven relay to control additional separately powered contactor relay for hood fan Customer to supply duct and ventilator fan per state and local codes Chamber vents are factory ducted to this integral hood 750 CFM required 0 4 W C static pressure drop through standard Type 2 hood steam amp heat 900 CFM required 0 6 W C static pressure drop through grease Type 1 hood grease filters Hood is UL710 Listed when grease filters are installed Type B gas vent can be used except when bake products are grease laden NOTES 1 A F F Above finished floor 2 Customer responsible to finish and install all utilities to and from oven FULL LOAD AMPS 3 All services must comply with all Federal State and Local codes installed o
49. der from Bakery Support Draft meter BACHARACH Model 13 3000 DCL 24490 or Dwyer Part No 460 8 GAS RACK OVEN GENERAL 1 8 1 5 SPECIFICATIONS SINGLE POINT VENTING WATER 1 2 30 75 PSI required 14 PSI regulator during flow cold water required customer to install in line filter shut off valve and line strainer Q DRAIN 6 1 4 front or 7 rear connection A F F See notes Route to air gap drain Do not slope drain upwards Plug the drain connection that is not in use Rear Drain 1 2 NPTF Front Drain 1 2 NPTF GAS Natural Gas N G 3 4 NPT W C N G N G rated 1025 BTU CU FT SP GR 1 00 Liquified Propane Gas L P G 3 4 NPT W C L P G L P G rated 2440 BTU CU FT SP GR 1 52 NOTE Line pressure must be measured as flow pressure Dex NATURALGAS LIQUIFIED PROPANE GAS BTU HR 180 000 180 000 5 0 10 0 12 0 14 0 amp ELECTRICAL Two supplies required 120 60 1 20 AMP dedicated circuit required 1 208 240 60 1 6 8 AMPS 208 240 60 3 HOOD VENT 8 DIA connection collar Customer to supply duct and ventilator fan per state and local codes Air proving switch factory installed amp integrated with burner system operation Oven provided rely with max 6 amp 1 3 120V output for fan operation If larger use oven relay to control additional separately powered contactor rela
50. duced in 5 second on 5 second off 9 ith ed Mode intervals for the time set in P7 The correspond WIE moge maximum solenoid on time range that Selection can be set in P7 increases to 60 seconds Change P7 to 60 when P20 is set for 1 When P20 is changed from 1 Restricted Operator Mode to 0 Standard Mode P7 must be changed below 30 range 0 to 30 max or solenoid will energize continuously for up to 60 seconds Select 1 for Advance Energy Saving Forcing the oven into an Advance Auto On Auto Off Mode to conserve energy Advanced Energy Saving Several steps are necessary to enable Mode this mode Set the Auto On Time to 60 0 Standard minutes before the first bake time Set Set for 0 1 Advanced Energy the Auto Off Time Press the Auto On Saving Mode Auto Off button to illuminate the Timer On Off indicator Set P17 amp P18 to customer settings See Advanced Energy Saving Mode as outlined in this section Select 1 for installation of an HBA control panel and control door on an OV210 Set for 0 When enabled the OV210 will emulate all the functions of an HBA OV210 Mode 0 Standard 1 OV210 Mode F25119 Rev B February 2009 Page 32 of 64 8 GAS RACK OVEN SERVICE PROCEDURES AND ADJUSTMENTS CONTROLLER DEFAULT SETTINGS Timer ERN Settings Shown In Unused OOS Setfor 0 Communicate Mode P25 0 Direct Connect 1 NAFEM Protocol Select 1 for NAF
51. e for rear drain connection 7 Top of oven requires a minimum of 24 for service accessibility 8 Customer responsible to install flue piping Flue must be vented outside of building 9 Manufacturer reserves the right to make changes in sizes and specifications Export Ratings WATER 1 2 NPT 2 1 5 2 Bar cold water required customer to install in line filter shut off valve and line strainer Flow rate of 8 l min GAS Natural Gas N G 3 4 NPT N G Rated 38 2Mj m or 9120 Kcal m SP Gr 1 00 Liquefied Propane Gas LPG 3 4 NPT LPG Rated 90 9Mj m or 21710 Kcal m SP Gr 1 52 NATURAL LIQUIFIED PROPANE GAS GAS cm W C 30 5 35 6 wn NOTE Pressure not to exceed 35 6 cm W C or 3 5 kPa amp ELECTRICAL Single supply connection provided 380V 3ph 50Hz 400V 3ph 50Hz or 415V 3ph 50Hz 6 A circuit required 1 kVa Transformer supplied for control and operation voltage of 110V This is a multifunction transformer output voltage should be verified before operation Oven fan 1 1kW operates 380 415V 3ph 50 Hz 2 4 2 2A HOOD VENT 20 3 cm DIA Connection collar Customer is to supply duct and ventilator fan per federal and or local codes Chamber vent steam and combustion exhaust are discharged into the hood An air proving switch is factory installed and integrated with burner System operation If proper ventilation is not provided burner will not operate Oven provides a relay to acti
52. e to top of oven Mark 8 3 4 from end of probe Sm Insert male compression fitting onto thermostat probe Install female fitting into bulb location Insert 8 3 4 of backup thermostat into oven Ensure that backup thermostat bulb doesn t touch inner walls of oven 8 Install first set of 3 spacers over capillary tube and allow them to go into the female compression fitting 9 Pack seal gasket material around capillary tube 10 Insert second set of 3 spacers over capillary tube and allow them to go into the female compression fitting 11 Tighten male compression fitting against second set of spacers to secure backup thermostat bulb FEMALE SEAL SECOND SET OF COMPRESSION GASKE 2 SPACERS FITTING _ 20 COMPRESSION FITTING 7747 FIRST SET OF 3 SPACERS 12 Install probe cover 13 Check oven for proper operation TEMPERATURE PROBE AWARNING WARNING Disconnect the R electrical power to the machine PRN follow lockout tagout procedures DES There may be multiple circuits Be Up sure all circuits are disconnected 1 Access the probe at top of the oven 2 Remove screws securing probe cover from oven 3 Remove compression fitting and remove probe from oven F25119 Rev B February 2009 TEMPERATURE PROBE 4 Open control compartment door to gain access to controller 5 Remove cover f
53. ead wires from appropriate pressure switch Remove tube from pressure switch Remove screws securing pressure switch F25119 Rev B February 2009 8 BXAGP GAS RACK OVEN REMOVAL AND REPLACEMENT OF PARTS DRAFT INDUCER PRESSURE SWITCH HOOD VENT PRESSURE SWITCH HOOD VENT PRESSURE SWITCH 5 Reverse the procedure to install OVEN CAVITY VENT MOTOR WARNING Disconnect the electrical power to the machine and follow lockout tagout procedures 22 There may be multiple circuits S sure all circuits are disconnected 1 Remove vent lid 2 Remove screws securing vent motor cover and mounting assembly from vent box F25119 Rev B February 2009 REMOVE ASSEMBLY 4 SCREWS 3 Disconnect lead wires from vent motor and vent Switch 4 Loosen vent cam set screw and remove cam from shaft NOTE Mark location of cam on vent motor shaft LOOSEN SET SCREW 20016 LOOSEN SET SCREW NOTE When installing position cam on motor shaft to prevent rubbing 5 Remove screws securing vent motor from vent motor bracket Page 24 of 64 8 GAS RACK OVEN REMOVAL AND REPLACEMENT OF PARTS MOUNTING SCREWS 6 Reverse the procedure to install OVEN CAVITY VENT SWITCH AWARNING WARNING Disconnect the electrical power
54. for reference The shutters are the short L shaped panels of stainless steel located on the right rear corner panel of the bake chamber There are 12 shutters per oven consisting of 24 adjustable air volume settings and 12 adjustable angle settings Air volume adjustments modifies the heat from top to bottom of rack s Shutter angle adjustments direct the heat to side or center of rack s Oven pressure panel feeler gauge Part No 01 1M5561 1 for previous ovens settings does not supercede to oven pressure panel feeler gauge 01 1M5689 1 Do not discard feeler gauges Evaluating Product 1 Observe a rack of product A Evaluate the rack of product 1 product is the same color from edge to center of trays but the color varies from top to bottom of the rack then an air volume adjustment is needed 2 If individual trays of the product are not the same color from edge to center then the angles need to be adjusted Adjust as necessary If satisfactory results can not be achieved after two or three attempts at adjusting call Bakery Product Support 49 of 64 25119 Rev B February 2009 8 BXAGP GAS RACK OVEN SERVICE PROCEDURES AND ADJUSTMENTS NOTE Changes in product whether raw mixed different mixes or old mix can affect the bake Air Volume Adjustment 1 Allow oven to cool 2 Determine the shutter that needs adjusted NOTE Always start at the dark areas and de
55. from assembly 4 Pull rotator shaft from rotator assembly set collar clutch disk drive sprocket thrush washer flanged bearing and male half of spherical bearing F25119 Rev B February 2009 FLAT ON SHAFT FOR SET SCREW OF SET COLLAR THRUST WASHER FLANGED BEARING UNDER SPROCKET SPHERICAL BEARING 1 14 o 5 Remove rotator drive chain from sprocket teeth 6 Remove flange bushing from rotator bracket 7 Remove female half of spherical bearing from lift arm only if replacing Assembly 1 Install female half of spherical bearing into the lift arm if removed ANTI ROTATION WM PIN SET COLLAR 2 2 Apply high temperature grease to female half of spherical bearing Spread grease evenly across bearing surface Install flange bushing into rotator assembly Install male half of spherical bearing with taper to mate with female half onto flanged bushing 5 Insert rotator shaft into flange bushing from bottom of rotator assembly and install thrust washer Page 12 of 64 8 GAS RACK OVEN REMOVAL AND REPLACEMENT OF PARTS THRUST WASHER m FLANGE MEE BUSHING AGO SUPPORT BRACKET SPHERICAL BEARING MALE 8115 Install drive chain around drive sprocket Continue to push the shaft through the rotator assembly As you do install drive sprocket onto shaft tooth side
56. ier centered in door opening rack should be pushed onto rack carrier without forcing or lifting wheels from oven floor or forcing the rack downward 2 With door closed and rack carrier raised and turning the wheels should clear oven floor Adjustment Except C Channel Type Rack 1 Access rack position switches on top of oven 2 Make sure switch actuator is bent at 90 and is between rack height switches 3 Loosen the screws securing lift switch bracket A If rack wheels are not touching the floor in loading unloading position lower bracket B If rack wheels are touching the floor in bake position raise the bracket NOTE Product rack should load onto carrier without resistance and should rotate with the wheels off oven floor UPPER amp LOWER LIFT SWITCH BRACKET STARTING POINT FOR TYPE RACK ADJUSTMENT MOUNT UPPER LIFT SWITCH LOWER SET OF HOLES SET BRACKET AS LOW AS MOUNTING BOLTS PERMITE MOUNT LOWER LIFT SWITCH 9172 1 With door open and rack carrier centered in door opening push shortest rack up to the front of the rack carrier 2 Verify distance between the underside of upper section of rack s C channel and top surface of the rack carrier Dimension A UP POSITION T ACTUATOR 4 Tighten the lift switches bracket screws 5 Check for proper operation Adjustment for C Channel Type Rack NOTE Locate customer s shortest and tallest C type
57. k with a soap and water solution bubbles Do not use an open flame A CHECK ALL JOINTS PRIOR TO THE GAS VALVE SOLENOID BEFORE LIGHTING UNIT B CHECK ALL JOINTS AFTER TO THE GAS VALVE SOLENOID AFTER THE UNIT IS LIT 1 Open control compartment door to gain access to gas manifold assembly 2 Disconnect lead wires to gas valve ignitor and flame sensor 3 Disconnect the gas supply union fitting from gas manifold assembly 4 Remove all screws securing gas manifold to burner rack assembly joe 4201706 BURNER RACK ASSEMBLY Page 17 of 64 n BE c BURNER MOUNTS 5 Pull gas manifold from burner rack assembly 6 Remove orifice fitting from gas manifold NOTE Note orifice size for natural or L P 7 Reverse the procedure to install HEAT EXCHANGER WARNING Disconnect the electrical power to the machine and follow lockout tagout procedures There may be multiple circuits Be sure all circuits are disconnected WARNING Shut off the gas before servicing the unit WARNING AII gas joints disturbed during servicing must be checked for leaks Check with a soap and water solution bubbles Do not use an open flame A CHECK ALL JOINTS PRIOR TO THE GAS VALVE SOLENOID BEFORE LIGHTING UNIT B CHECK ALL JOINTS AFTER TO THE GAS VALVE SOLENOID AFTER THE UNIT IS LIT 1 Disconnect gas manifold at the union fitting 2 Di
58. lay while alarm sounds Oven does not operate Erratic display Rack does not lift when bake cycle is initiated Rack does not turn when bake cycle is operating Rack does not lower when rack stops in load unload position when door is opened during or at end of bake cycle door is opened No steam or low volume of steam Rack stops in wrong position or doesn t stop after Page 61 of 64 Controller inoperative Controller membrane inoperative Back up control switch on If applicable Door open High limit thermostat open Hood pressure switch open Incorrect wiring Oven in Oven Temperature Safety Alarm Mode Temperature at the temperature probe between 570 to 600 F for ten seconds Remove 120VAC supply power to the oven Lift motor or OL2 open Door open or door switch malfunction Controller malfunction Mechanical bind due to actuator or lift shaft LS1 inoperative Rotator motor malfunction or OL2 open Door open or door switch malfunction Controller malfunction Mechanical bind due to rack or chain LS1 inoperative Door switch malfunction Lift motor or OL2 open Controller malfunction Mechanical bind due to actuator or lift shaft LS2 inoperative Rack pointer switch out of adjustment Rack position switches not adjusted or inoperative malfunction Carrier set screws loose Water supply to oven not on Incoming water p
59. ls Door Switch 2 Allows control to monitor door position and directs power to rack rotation motor and rack lift motor Draft Inducer Pressure Switch Senses vacuum created by draft inducer fan Prevents burner ignition if sufficient combustion air is not present Hood Pressure Swilchi Senses vacuum in hood vent Prevents burner ignition if sufficient exhaust vacuum is not present Hi Limit Thermostat Prevents oven temperature from exceeding 550 auto reset Gas Valve When energized allows gas to flow to burners Ignition Control Module Controls and monitors gas heating Energizes gas valve coil hot surface ignitor draft inducer and monitors presence of flame Hot Surface Ignitor When energized ignites gas Roll out Switch Opens if flame goes beyond confined area of heat exchanger and into control compartment At 350 F opens circuit to ignition module manual reset Not equipped on all ovens Flame Sensor Monitors flame at the burner Water Solenoid SV1 When energized allows water to flow onto oven steam generator Cir Fan Motor M1 Circulates air around heat exchanger tubes into oven cavity Cir Fan Motor Contactor MR1 Controls power to circulation fan motor Rotator Motor When energized turns baking rack Overload OL1
60. motor mounting bolts and sprocket set screw F25119 Rev B February 2009 8 GAS RACK OVEN REMOVAL AND REPLACEMENT OF PARTS BLOCK ASSEMBLY UP FOR ACCESS TO SPROCKET Disconnect the rotator motor lead wires Remove cooling fan from motor Loosen rotator motor sprocket set screw gu Spice AT Remove rotator motor mounting screws SET SCREW let MOUNTING SCREWS 4 6 Lift rotator motor and sprocket will stay in place Assembly 1 Install rotator motor shaft through rotator assembly and rotator sprocket 2 Position sprocket onto rotator motor shaft collar side towards motor 3 Install rotator motor mounting screws and align sprocket and rotator drive chain Ensure rotator drive chain is not in a bind 4 Secure set screw onto motor shaft 5 Connect rotator motor lead wires NOTE Shaft rotation viewed from top of oven Clockwise Rotation Red wire 20 Black wire 53 White White wires recommended F25119 Rev B February 2009 6 Install cooling fan to motor shaft 7 Remove block from rotator assembly 8 Check for proper operation ROTATOR MOTOR ROTATOR 2 SPROCKET PLATE 29 5 SWITCHES ROTATOR DRIVE CHAIN 7601 ACTUATOR ky A WARNING Disconnect the A lt gt electrical power to the machine follow lockout tagout pro
61. n non combustible surface only with no combustible material within 18 inches above the appliance The appliance is to be mounted on floors of non combustible construction with non combustible flooring and surface finish and with no combustible material against the Page 9 of 64 underside or on non combustible slabs or arches having no combustible material against the underside Such construction shall in all cases extend not less than 12 inches beyond the equipment on all sides 5 The floor must be of non combustible material and must be level with surrounding area with a maximum slope of 1 8 per foot up to 3 4 maximum in all directions Floor anchors require a minimum 1 thick solid floor substrate 6 Oven is UL C UL classified and CSA AGA CGA approved for 0 clearance on the side and rear walls Unit requires 1 to 4 clearance for rear drain connection 7 Top of oven requires minimum of 24 for service accessibility 8 Customer responsible to install flue piping Flue must be vented outside of building 9 Manufacturer reserves the right to make changes in sizes and specifications Export Ratings WATER 1 2 NPT 2 1 5 2 Bar cold water required customer to install in line filter shut off valve and line strainer Flow rate of 8 l min GAS Natural Gas N G 3 4 Rated 38 2Mj m or 9120 Kcal m SP Gr 1 00 Liquefied Propane Gas LPG 3 4 NPT LPG Rated 90 9Mj m or 21710
62. nal Type 1 hood grease filters Hood is UL710 Listed when grease filters are installed Type B gas vent can be used except when bake products are grease laden VENT 8 DIA draft diverter and power venter provided for exhaust duct Airflow proving switch is factory installed and integrated with burner system Airflow proving switch is to be connected between the draft diverter and power venter Oven provided relay with max 6 0 Amp 1 3 H P 120V output for power venter operation Type B vent minimum NOTES 1 A F F Above finished floor 2 Customer responsible to finish and install all utilities to and from oven 3 All services must comply with all Federal State and Local codes 208 240 60 1 installed on non combustible surface only with no combustible material within 18 inches above the appliance The appliance is to be mounted on floors of non combustible construction with non combustible flooring and Page 7 of 64 surface finish and with no combustible material against the underside or on non combustible slabs or arches having no combustible material against the underside Such construction shall in all cases extend not less than 12 inches beyond the equipment on all sides The floor must be of non combustible material and must be level with surrounding area with a maximum slope of 1 8 per foot up to 3 4 maximum in all directions Floor anchors require a minimum 1 thick solid floor subs
63. nt steam and combustion exhaust are discharged into the hood An air proving switch is factory installed and integrated with burner system operation If proper ventilation is not provided burner will not operate Oven provides a relay to activate a customer supplied and powered contactor relay so that when oven is powered up external fan will operate The hood requires a minimum of 19 5 m min for safe operation For fan calculation purposes you should assume 0 15 kPa resistance through the hood Grease filters optional may be installed in the hood instead of standard baffle EXHAUST VENT 20 3 cm DIA draft diverter and power venter provided for exhaust duct Airflow proving switch is factory installed and integrated with burner system Airflow proving switch is to be connected between the draft diverter and power venter Oven provided relay with max 6 0 Amp 1 3 H P 120V output for power venter operation Type B vent minimum F25119 Rev B February 2009 8 GAS RACK OVEN GENERAL 2162 IV vis wo E 4 a 0 94 wo 66 m i wo 06 021 079 woz st 5 5 p WIZ OL ay ine Z v9c ois 1NIOd e ee 153 70 D 01 3811 E 4 0 9uo zsi 84 uo uO 2 02 S
64. ntinue A Operate the oven for a minimum of 5 minutes B While burner is lit check for a back draft at the draft diverter relief opening i e smoke emitted from a smoldering source Page 43 of 64 C back draft indicated smoke going up draft diverter relief opening test is complete D If back draft indicated smoke not going up draft diverter relief opening the oven must not be operated until proper adjustments have been made correct flue stack to have adequate up draft through the draft diverter relief opening DOOR ADJUSTMENT Check 1 With the door in the closed position visually check door strike to door handle catch vertical alignment 2 With the door closed visually check gap around door jamb and edge of door DOOR STRIKE DOOR HANDLE CATCH s VERTICAL ALIGNMENT 3 Catch and strike should be vertically aligned within 3 16 of each other and gap should be equal on al sides and top NOTE Obtaining the handle to strike is more important than an equal gap However if the door rubs against the jamb or drags the facility floor when opening call Bakery Service Support NOTE Door handle adjustment can assist in obtaining the handle to strike vertical alignment NOTE Only rack ovens with wide view window in the loading door will have the adjustable door hinges Adjustment Early Models Only The only way to adjust the door is to move the door jambs
65. o burner side rack assembly and pull ignitor out Disconnect flame sensor lead wire Remove burner side rack and end shot burner assembly Make sure burners are evenly spaced Check for 025 spacing in cross over tube F25119 Rev B February 2009 38 of 64 PROPANE GAS pe EVEN SPACING BETWEEN BURNERS _ 8 GAS RACK OVEN SERVICE PROCEDURES AND ADJUSTMENTS FLAME SENSE LOCATION 1 sensor is located at the bottom of the burner assembly 2 Flame sensor is positioned at the lower edge of the last end shot burner 3 Flame sensor should be parallel to the face of the burner and horizontal to the lower edge PARALLEL AND HORIZONTAL TO BURNER FLAME SENSE CURRENT TEST Flame sense current is rectified through the flame from ground to sensor A minimum flame sense current is necessary to keep ignition system from lockout 1 Disconnect flame sensor wire from ignition control module at S2 terminal 2 Connect multi meter black lead to terminal S2 on the ignition control module and red lead to flame sensor lead wire NOTE Flame sense current can also be checked at flame sensor wire connection FLAME SENSOR CURRENT TEST MULTIMETER USE MICROAMP SCALE IGNITION CONTROL MODULE RED LEAD WIRE 6190 3 Turn oven power on and set controller to call for heat 4
66. o burner sequence of operation for burner details 7 Oven will cycle at preheat temperature 375 F default until operator changes the conditions F25119 Rev B February 2009 52 of 64 8 BXAGP GAS RACK OVEN ELECTRICAL OPERATION Bake Cycle 1 Oven preheat temperature 2 Operator sets conditions for bake cycle NOTE If steam is part of the bake cycle bake time must also be entered and the steam cycle will always be first 3 Door is opened to load rack A Control de energizes outputs to ignition module and circulation fan motor contactor NOTE If rack carrier is not in load position the control will position rack carrier in load position if door is ajar 4 Rack loaded onto carrier and close door A 062 contacts close both sets 1 Door input to control board A2 lit 2 de energized B DS2 contacts open both sets 1 Circuit path to lift motor completed thru DS2 N C 2 Circulation motor energized 3 Refer to burner sequence of operation 5 Bake cycle started by pushing timer start button NOTE The door can be opened at anytime during the bake cycle If so the rack will stop at home position and lower Circulation motor and burner will not operate Bake timer paused until door is closed A Out put from control board to lift motor A11 lit 1 Lift motor energized to lift rack 2 After rack starts to lift LS2 contacts open and N C c
67. of the oven If not the blower wheel must be accessed thru the heat exchanger compartment WARNING Shut off the gas before servicing the unit WARNING AII gas joints disturbed during servicing must be checked for leaks Check with a soap and water solution bubbles Do not use an open flame A CHECK ALL JOINTS PRIOR TO THE GAS VALVE SOLENOID BEFORE LIGHTING UNIT B CHECK ALL JOINTS AFTER TO THE GAS VALVE SOLENOID AFTER THE UNIT IS LIT 1 If necessary move the gas line out of the way 2 Shut off water supply line and remove exterior water supply that is within the boundary of blower cover Disconnect lead wires at motor junction box Remove motor junction box 3 4 5 Remove probe cover and any existing probes 6 Remove blower cover supports 7 Remove blower cover F25119 Rev B February 2009 8 GAS RACK OVEN REMOVAL AND REPLACEMENT OF PARTS BLOWER Remove insulation Remove screws from blower mounting assembly and remove complete blower assembly 10 Loosen set screws in blower wheel hub 11 Remove split ring from shaft 12 Remove blower wheel from motor shaft LOOSEN SPLIT RING SET SCREWS 13 Remove screws securing motor mounting bracket and remove motor assembly MOUNTING BRACKETS 14 Remove heat slinger and mounting bracket from motor 15 Reverse the procedure to install F25119 Rev
68. ontacts close 6 Rack reaches raised position A LS1 N C contacts open 1 Lift motor M5 de energized B LS1 N O contacts close 1 Rotator motor M4 energized 7 If steam is of the bake cycle A Water solenoid SV1 will be energized A10 lit for the required number of seconds NOTE 30 seconds is the maximum number of seconds that the control will energize SV1 The steam time can be set to a maximum of 95 seconds B Circulation motor and burner will not operate A6 and A8 not lit 8 Steam cycle ends A Water solenoid SV1 de energized B Circulation motor and burner operate 9 Remainder of bake cycle controlled by bake timer 10 Time expires and buzzer sounds 11 Stop button pressed to silence buzzer NOTE Rack remains in bake position and rotating until door is opened 12 Door opened to unload oven A Control removes power from heat output and circulation blower output 1 Circulation motor and burner will not operate while door is open 092 contacts open both sets 1 Input removed from control board A2 not lit 2 Circuit to rotation motor completed thru N O contacts 53 of 64 F25119 Rev B February 2009 HBAG 8 GAS RACK OVEN ELECTRICAL OPERATION C 062 contacts closed both sets 1 Circuit to rotation motor completed thru 052 N O and N C D Rack continues to rotate until rack pointer operates rack position switch 1 and
69. open at the beginning of Set for 90 range 0 to 180 seconds the venting cycle P11 This value is the percentage the bake Set for 15 range 5 to Set for 20 range 0 to 30 max Maximum steam time in Time set is the maximum time in when P20 set for 0 P seconds seconds that water is supplied during standard 60 max when P20 Vent open percentage chamber vent is open after the vent 100 evacuate time has expired End of bake time auto vent 3 P12 enable This value automatic vent Set for 0 0 disable 1 enable 1 This is the number of minutes before the end of the bake cycle that the vent is Set for 1 range 0 to 99 open End of bake time auto vent in minutes Steam time in seconds or Food Service Mode Steam Interval 0 seconds 300 to 900 Food Service Mode This value is the brightness of the interior P15 Interior light brightness lights The higher the number the Set for 90 range 50 to 100 brighter the lights Page 31 of 64 F25119 Rev B February 2009 Displays steam time in seconds or operation in Food Service Mode The Steam time in seconds 0 number of seconds set is the steam Food service Mode range interval See FOOD SERVICE STEAM 300 to 990 seconds MODE as outlined in this section 8 GAS RACK SERVICE PROCEDURES AND ADJUSTMENTS CONTROLLER DEFAULT SETTINGS Timer ges Settings Shown In uspisy Settem
70. or collar set screw and move the collar upward until door switches are not operated 5 Tighten collar set screw F25119 Rev B February 2009 DOOR OPEN Open oven door Plunger should operate switches before handle side of door is opened more than 3 inches 8 Check for proper operation RACK POSITION SWITCH ADJUSTMENT Position carrier in product load unload position 2 Access the rack position switches at top of oven 3 Loosen rack position switch screws Adjust switches up or down so wheel of actuator arm will contact rack pointer in middle of ramp just prior to the load unload position and will operate switch when flat spot of pointer is contacted RACK POINTER RACK POSITION SWITCH 5 Tighten screws 6 Check for proper operation RACK POSITION ADJUSTMENT 1 Operate oven so that when door is opened rack will attempt to stop in load unload position 2 If rack has not stopped in load unload position adjust NOTE Do not allow rotator shaft to move Page 44 of 64 8 GAS RACK OVEN SERVICE PROCEDURES AND ADJUSTMENTS A Access the set screws that secure the rack carrier B Loosen set screws 4 that secure rack carrier C Move carrier to load unload position D Tighten set screws 3 Check for proper operation rack centered in home position with door opening RACK HEIGHT ADJUSTMENT Check 1 With door open and rack carr
71. ows rack to be lowered Rack Lift Motor M5 M5 Raises and lowers rack OVEN SEQUENCE OF OPERATION Oven Idle Mode Idle mode exist when the supply voltage is at the oven control and the control power switch has been turned off for a minimum of 20 minutes 1 Supply voltage to control with clock displayed A1 lit 2 If door is closed A2 lit 3 If door is open A2 not lit and rack in load unload position A energized 4 Vent closed A3 lit 5 Hood vent output 5 lit 1 energized and hood mounted fan de energized 6 Interior lights will light if door is opened 9 lit Neutral to one side of the following components 24V transformer CR1 Lights MR1 5 1 2 4 5 8 High limit roll out switch and overloads OL1and OL2 closed Pre Heat Cycle This condition exist as the operator prepares to bake 1 Oven at idle conditions 2 Door closed A2 lit 3 Control power switch turned on A Interior lights are illuminated B Control energized display is lit C 5 delay before call for heat 4 End of 5 second delay A CR1 de energized A5 not lit Roof mounted fan energized B MR1 energized lit Circulation motor energized 5 Hood pressure switch closes A 24 VAC transformer energized 1 24 VAC to L1 and R of ignition control 2 24V to control A4 lit B 120V to F1 of ignition module 6 Heat output from oven control A8 lit A Refer t
72. r above oven 2 Single point venting connect incline manometer or equivalent to draft inducer pressure switch For dual point venting insert incline manometer tube 6 above draft diverter 3 With a burner flame established take combustion measurements and CO readings O Range 6 to 10 CO Not to exceed 0 04 400PPM A If readings can not be obtained adjust the draft inducer baffle and retest for combustion 14501115 NOTE If combustion readings still can not be obtained contact Bakery Support F25119 Rev B February 2009 Page 40 of 64 8 GAS RACK SERVICE PROCEDURES AND ADJUSTMENTS DRAFT INDUCER PRESSURE SWITCH DUAL POINT VENTING EC 8 DIA FLUE STACK CUSTOMER SUCTION SUPPLIED TEST POINT DRAFT 6 DIVERTER DRAFTDIVERETER TUBE 231 5 211 CLEARANCE DIVERTER RELIEF 2 OPENING OVEN DRAFT INDUCER 20200 SERVICE ENTRANCE 3 There should be a vacuum reading of HBA1G BXA1G Vertical Draft Motor MANUFACTURED PRE JULY 2005 Oven Natural Gas Propane Temp 02 minimum readings minimum readings 0 22 W
73. racks Page 45 of 64 C CHANNEL ON RACK RACK CARRIER 9174 A dimension is outside of 0 200 to 0 375 access rack position switches on top of oven B Loosen bolts securing upper amp lower lift switch bracket and move bracket up and recheck dimension A Move shortest rack out of the way Move tallest rack to rear of rack carrier 5 Check distance between the top surface of lower section of rack s C channel and bottom surface of the rack carrier Dimension B F25119 Rev B February 2009 8 GAS RACK SERVICE PROCEDURES AND ADJUSTMENTS C CHANNEL ON RACK DESSEN B RACK CARRIER 9175 A If dimension B is less than dimension A adjust upper amp lower lift switch bracket until dimension A is less than dimension B NOTE If dimension B exceeds 0 400 than adjust upper amp lower switch bracket up to have clearance at dimension A 6 Load rack s onto rack carrier close door and allow rack carrier to lift and rotate NOTE HBA2G amp BXA2G oven use 1 double or 2 single racks If using single racks use the shortest and tallest together A Verify that rack s wheels when at the rear location of the baking compartment do not drag on the oven floor B If wheels drag move upper lift switch to the top holes in upper amp lower lift switch bracket MOUNT UPPER LIFT SWITCH UPPER SET OF HOLES 9
74. ressure too low Solenoid valve malfunction Control malfunction Vent open or vent switch malfunction F25119 Rev B February 2009 8 GAS RACK OVEN TROUBLESHOOTING POSSIBLE CAUSES Excessive moisture in oven Solenoid sticking open Drain clogged or plumbed incorrectly Malfunctioning water pressure regulator Excessive water pressure Recovery time slow after steaming Excessive water input Program set point incorrect Hysteresis programed incorrectly Gas supply pressure improperly adjusted Cavity vent open Incorrect heat Control not calibrated Control in incorrect temperature mode F vs C Temperature probe malfunction Circulation fan motor malfunction See BURNER TROUBLESHOOTING Burner does not light No output from controller Door open or door switch inoperative See BURNER TROUBLESHOOTING High or low draft pressure in oven draft inducer Draft inducer motor fan malfunction Draft inducer fan blade not positioned on motor shaft correctly Damaged draft inducer fan blade Roof mounted fan too large high pressure or too small low pressure Lights do not work Bulbs burned out Control program set to OFF Incorrect supply voltage Uneven baking Circulation fan loose on motor shaft or damaged Obstruction in air channels Circulation motor s inoperative Air and angle shutters not adjusted correctly F2511
75. rom controller box 6 Disconnect temperature probe lead wires from controller board 7 Remove temperature probe from oven NOTE Temperature probe should be install approximately 8 3 4 down from top of probe fitting into oven compartment 8 Reverse the procedure to install EPROM REPLACEMENT ky Disconnect the LR NI electrical power to the machine and Ze follow lockout tagout procedures J 22 There may be multiple circuits Be lt sure all circuits are disconnected 27 1 Open the control compartment door to gain access to controller 2 Remove the controller box cover NOTICE Static electricity will damage the controller board Use an anti static grounding kit when servicing the controller 3 Remove the prom from the controller 4 Install the new prom Verify orientation notch and carefully align pins of prom ORIENTATION W PROM NOTCH PROM BASE a TSP1156C 5 Re assembly the oven 6 Perform controller default settings as outlined under CONTROLLER DEFAULT SETTINGS Page 26 of 64 8 GAS RACK OVEN REMOVAL AND REPLACEMENT OF PARTS 7 Check for proper operation DOOR SWING CHANGE WARNING Disconnect the 2 electrical power to the machine and follow lockout tagout procedures SIE There may be multiple circuits Be 407 8 sure all circ
76. sconnect flame sensor lead wire F25119 Rev B February 2009 8 GAS RACK OVEN REMOVAL AND REPLACEMENT OF PARTS 6 Remove burner angle rack HBA2G amp BXA2G only BOTTOM OF CONTROL 3 Remove screw securing hot surface ignitor to burner side rack assembly and pull ignitor out 4 Remove screws securing burner rack enclosure from oven REMOVE ALL SCREWS BURNER RACK ENCLOSER 5 Remove burner firing plates 20 8 BXA2G only F25119 Rev B February 2009 7 Remove steam and exchanger compartment panels Remove steam ball assembly Remove screws from heat exchanger and flue connection HBA2G amp BXA2G only For HBA1G amp BXA1G oven access draft inducer box on top of oven and remove Disconnect deflector baffle from hangers above heat exchanger tubes and remove from top of tubes HBA2G BXA2G only NOTE Later model ovens do not have a heat exchanger to flue connection Flue is a single piece construction 10 Lower leveling post to allow room at flue connection and transition chamber Page 18 of 64 REMOVAL AND REPLACEMENT OF PARTS HBAG BXAG amp BXAGP GAS RACK OVEN HBA2G amp BXA2G OVENS LEVELING POST a i h c TRANSITION CHAMBER 8123 HBA2G 8 BXA2G oven rear of heat exchanger into the oven cavity As you slide rear of heat exchanger
77. sired time seconds between steam cycles by pressing the Bake Timer Up Down Arrows Range 300 to 990 seconds by increments of 10 seconds Example Parameter P14 set to 300 Steam Time set to 3 Steam cycle will initiate for 3 seconds after every 300 seconds 2 Pressthe Power On Off keypad to save settings and exit Setup Mode OVEN TEMPERATURE SAFETY ALARM NOTE Standard feature no parameter setup required If the temperature at the oven probe is between 570 to 600 F for ten seconds the controller will do the following Shuts off all oven features Sounds alarm and flashes the Oven Temp display Display SHdn shutdown in the Bake Timer display NOTE The oven will remain in Oven Temperature Safety Alarm Mode until the 120Volt supply power is turned off to the oven Page 33 of 64 25119 Rev B February 2009 8 GAS RACK SERVICE PROCEDURES AND ADJUSTMENTS ADVANCED ENERGY SAVING MODE The Advanced Energy Saving Mode is NOT the default setting The default value for parameter P21 is 0 NOTE When 21 is set to 1 Advanced Energy Saving Mode enabled the Auto On Off Time can only be changed in set up mode To disable the Auto On Off Time P21 must be set to 0 disabled The Advanced Energy Saving Mode automatically starts the oven at the preset time sets the temperature to P2 default of 375 F and the timer is set for 60 minutes and running When the o
78. t RORIS DA DER Te Dat eink 17 Ignition Module eae hehe cen eee dele eene 20 Controller ote tte d eee Le 20 SwItCh ae 21 Draft Mauca ee tae UR E ER LA ee Be 22 HBA1 8 BXA1 Ovens and 2 BXA2 Later Models Only 22 HBA2 8 BXA2 Early Models hh 23 Pressure Switches dye ed de Re Eon Ye RO eer E E beds 23 Oven Cavity Vent Motor hr 24 Oven Cavity Vent Switch 0 25 Thermostat Back up System Only 25 Temperature Probe eee 26 Eprom _______________ 26 Door Swing Change 27 SERVICE PROCEDURES AND ADJUSTMENTS 29 Controller Input output Status Diagnostic liiis 29 Ignition Module Self Diagnostics liliis RII nr 29 Temperature Probe Test 29 Controller Temperature 0
79. t Control Fault 1 Flash Air Flow Fault 2 Flash Flame No Call For Heat 3 Flash Ignition Lockout Page 63 of 64 25119 Rev B February 2009 8 BXAGP GAS RACK OVEN TROUBLESHOOTING BURNER TROUBLESHOOTING NOTE BEFORE TROUBLESHOOTING FAMILIARIZE TURN GAS SUPPLY OFF YOURSELF WITH THE SEQUENCE OF OPERATION SET CONTROLLER TO CALL FOR HEAT Nou alah are Check line voltage power high limit thermostat hood pressure switch 5 low voltage transformer fuse roll out switch controller draft inducer NOTE If ignition control M module is locked out turn pressure switch and wiring oven power switch OFF then back ON Set controller to call for heat YES Fault on ignition control module Pull ignition lead NO HOT SURFACE IGNITER NO check ignition Replace ignition ENERGIZED See IGNITION voltage at control module CONTROL MODULE ignition module YES TROUBLESHOOTING YES Replace ignitor Check that manual shut off switch on gas valve is turned ON TURN ON GAS SUPPLY Check manifold pressure adjust as needed NO Check that all manual gas valves are open supply tubing and pressures BURNER LIGHTS are good and burner orifices are not blocked YES Check for excessive draft at pressure switch while draft inducer running Check electrical connections between ignition module and gas valve Check for 24vac across Mv1 and gnd terminals on ignition module
80. t the temperature offset P4 as outlined under CONTROLLER DEFAULT SETTINGS A If temperature test shows a temperature higher than controller increase offset P4 B If temperature test shows a temperature lower than controller decrease offset P4 C If temperature difference is greater than the range of the controller replace controller range 50 8 Check for proper operation 9 Remove temperature tester thermocouple from the oven CONTROLLER SETTINGS CLOCK SETTING 1 Press the Power On Off keypad to turn the oven on 2 Press and hold either Auto On Off Timer Up Down Arrows for 3 seconds 3 After the colon stops flashing use the Up Down Arrows to adjust the clock setting A After the desired time is set and the Up Down Arrows have not been pressed for 5 seconds the colon will start to flash indicating the clock has continued running PARAMETER SETTINGS 1 Access set up mode by pressing and holding Start while pressing Power On Off for seconds 2 Press Temp Up Arrow to select set up item shown in timer display 3 Usethe Bake Timer Arrows to adjust set up number in the temperature display 4 Use the following chart to restore default settings NOTE Early models only controller will have up to Parameter setting P19 F25119 Rev B February 2009 Page 30 of 64 8 GAS RACK OVEN SERVICE PROCEDURES AND ADJUSTMENTS CONTROLLER DEFAULT SETTI
81. temperature is 200 F 93 C If the oven temperature falls below 170 F 77 C an alarm will sound fast pulse rate NOTE Alarm will silence if oven temperature recovers back to 170 77 oven temperature falls below 150 the alarm will silence and controller will go into Kosher Lock Out Mode controller display will read LOC OUT Page 35 of 64 NOTE In Kosher Lock Out Mode controller locks out all controller operations and will need to be reset Obtain reset key from the facility s approval authority 3 reset a Kosher Lock Out Mode A Use the reset key and turn the reset switch full right to the Reset position then back to the off position NOTE Resetting the switch will put the controller back into the Kosher Enable Mode Once oven temperature reaches 200 F 93 C controller will enter Kosher Active Mode to OFF position OFF RESET 9922 B Verify the Bake Timer Display reads 1 flashing not press the Bake Timer Arrows until display reads 1 flashing C Press the Power On Off keypad entering the Kosher Active Mode NOTE The controller will call for heat in the Kosher Active Mode and maintain the minimum Kosher temperature 200 F 93 C 4 disable Kosher Operation Mode Bakery Mode A Oven controller off B Press and hold the Airflow Delay Arrow keypad while pressing the Power On Off keypad for 3 seconds C Press
82. the Bake Timer Arrows until Bake Timer Display reads 0 D Press the Power On Off keypad oven in Bakery Mode standard operation F25119 Rev B February 2009 8 GAS RACK OVEN SERVICE PROCEDURES AND ADJUSTMENTS BURNER ADJUSTMENTS MANIFOLD PRESSURE ADJUSTMENT WARNING Shut off the gas before servicing the unit NOTE Verify the type of gas required is the type of gas supplied 1 Attach a manometer to 1 8 NPT inlet pressure tap on gas valve 2 Turn gas supply on to oven and verify that static supply line pressure to oven does not exceed 14 W C 1 2 psig 35 6 cm W C 3 5 kPa for either natural gas or propane If supply line pressure exceeds 14 W C 1 2 psig 35 6 cm W C 3 5 kPa adjust pressure regulator If no pressure regulator customer must supply and install a line pressure regulator Adjust as needed 3 Turn gas off at supply valve 4 Move manometer to 1 8 outlet pressure tap on gas valve 5 Turn gas on at supply valve 6 Turn gas valve on and set controller to call for heat 7 With a burner flame established adjust the manifold pressure as indicated in the following charts or as indicated on the oven data plate NOTE Accurate gas pressure adjustment can only be made with the burner on NOTE Turn adjustment screw Clockwise to increase the pressure Counterclockwise to decrease pressure HBA1G amp BXA1G MANIFOLD PRESSURE NAT
83. trate Oven is UL C UL classified and CSA AGA CGA approved for 0 clearance on the side and rear walls Unit requires 1 to 4 clearance for rear drain connection Top of oven requires a minimum of 24 for service accessibility Customer responsible to install flue piping Flue must be vented outside of building Manufacturer reserves the right to make changes in sizes and specifications Export Ratings e 1 2 2 1 5 2 Bar cold water required customer to install in line filter shut off valve and line strainer Flow rate of 8 l min 9 GAS Natural Gas N G 3 4 Rated 38 2Mj m or 9120 SP Gr 1 00 Liquefied Propane Gas LPG 3 4 NPT LPG Rated 90 9Mj m or 21710 SP Gr 1 52 NATURAL GAS PROPANE GAS kCAL HR cm W C 12 7 25 4 30 5 35 6 m kPa 1 25 2 50 3 00 3 50 NOTE Pressure not to exceed 35 6 cm W C or 3 5 kPa ELECTRICAL Single supply connection provided 380V 3ph 50Hz 400V 3ph 50Hz or 415V 3ph 50Hz 6 A circuit required 1 kVa Transformer supplied for control and operation voltage of 110V This is a multifunction transformer so output voltage should be verified before operation Oven fan 1 1kW operates 380 415V 50 Hz 2 4 2 2A HOOD VENT 20 3 cm DIA Connection collar Customer is to supply duct and ventilator fan per federal and or local codes Chamber ve
84. uits are disconnected Open the door at least 90 degrees Remove door sweep from door assembly Use a J bar to lift door from center bottom off the door hinges and set aside 4 Remove both door jamb hinges from door Jem REMOVE SCREWS FROM BOTH DOOR JAMB HINGES A Onlater models only the door jamb hinge set screws will need to be loosen to remove hinge pins and insert in opposite direction upward NOTE Ensure hinge pin set screws engage into notch in pin and tighten set screws LOOSEN 72 DOOR JAMB HINGE SET SCREW AT zi Page 27 of 64 5 Remove pan head screws on opposite side of door jamb and install both door jamb hinges with flat head screws NOTE Leave one door jamb hinge loose to aid installation of door assembly REMOVE SCREWS AND INSTALL BOTH DOOR CI A Install pan head screws into other side of door jamb were hinges removed from 6 Remove door strike from door jamb REMOVE SCREWS 3 PLACES TOTAL A Remove screws securing cover plate on opposite side of door jamb and install door strike F25119 Rev B February 2009 8 BXAGP GAS RACK OVEN REMOVAL AND REPLACEMENT OF PARTS REMOVE SCREWS B Install cover plate onto other side of door 3 PLACES TOTAL P jamb strike was removed from N 7 Remove screws securing door switch actuator guide to door and install on opposite end of door
85. vate a customer supplied and powered contactor relay so that when oven is powered up external fan will operate The hood requires a minimum of 19 5 m min for safe operation For fan calculation purposes you should assume 0 15 kPa resistance through the hood Grease filters optional may be installed in the hood instead of standard baffle F25119 Rev B February 2009 8 GAS RACK OVEN GENERAL 90581 401 3915 1 7661 0798 962 ug 4912 br us S 02 9 is V uo 611 ii SOE wo 282 wo pi 616 9766 SUD 9621 OLS wo 7991319373 wo g 7 vm 315NIS 4D Lona uo gi Lr uaivw De uo z o 0 9 GATIWLSNI 8 03215 09119905 WOWINIA 8 062 25 0 LON SM3H1O AS Ee GATIVISNI ONY 03114405 NOL1VlIlIN3A NJAO SVD 8 NMOHS LNIOd 319NIS 64 F25119 Rev B February 2009 8 GAS RACK OVEN GENERAL 1 8 BXA1 GAS RACK OVEN SPECIFICATIONS DUAL POINT VENTING WATER
86. ven timer is timed out and no buttons are pushed on the controller for 15 minutes P17 the Set Back Mode will be enabled The oven will beep twice and the set temperature reduces to 18 set at 250 If oven is in Set Back Mode set the bake temperature and timer for 12 minutes and press start to prepare the oven for baking When buzzer sounds the oven is ready to load The oven will shut down automatically at the preset time 1 To enable the Advanced Energy Saving Mode A Oven controller off B Press and hold the Start keypad while pressing the Power On Off keypad for 3 seconds C Press the Set Timer Arrows to select parameter P21 D Enable Advanced Energy Saving Mode by pressing the Bake Timer Up Arrow to display 1 E Press the Set Timer Arrows to select parameter P17 Set to 15 using Bake Timer Up Down Arrows F Press the Set Timer Arrows to select parameter P18 Set to 250 using Bake Timer Up Down Arrows G Press Timer On Off Keypad so that the indicator light is illuminated H Consult with Bakery Manager for required start and end of bake time Press and hold the Auto On Time keypad while pressing the Up Down Arrows to set the Auto On Time 60 minutes prior to the requested start of bake time J Press and hold the Auto Off Time keypad while pressing the Up Down Arrows to set the Auto Off Time to the requested end of bake time K Press the Power On Off keypad to exit parameter set up mode
87. y for hood fan Chamber vents are factory ducted to this integral hood 600 CFM required 0 4 W C static pressure drop through standard Type 2 hood steam amp heat 690 CFM required 0 6 W C static pressure drop through optional Type 1 hood grease filters Hood is UL710 Listed when grease filters are installed Type B gas vent can be used except when bake products are grease laden NOTES 1 A F F Above finished floor 2 Customer responsible to finish and install all utilities to and from oven 3 services must comply with all Federal State and Local codes to be installed on non combustible surface only with no combustible material within 18 inches above the appliance The appliance is to be mounted on floors of non combustible construction with non combustible flooring and surface finish and with no combustible material against the underside or on non combustible slabs or arches having no Page 5 of 64 combustible material against the underside Such construction shall in all cases extend not less than 12 inches beyond the equipment on all sides 5 floor must be of non combustible material and must be level with surrounding area with a maximum slope of 1 8 per foot up to 3 4 maximum in all directions Floor anchors require a minimum 1 thick solid floor substrate 6 Oven is UL C UL classified and CSA AGA CGA approved for 0 clearance on the side and rear walls Unit requires 1 to 4 clearanc

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