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Summary of Contents for Vulcan-Hart A-130
- Page 1 Vulcan ® urnace Service Manual Models: A-130 3-130 3-550PD A550 3-550 3-550A A-1750 3-1750 3-1750A CERAMCO ®...
- Page 2 SAFETY SAFETY FIRST • Don’t bypass the power cord’s ground lead with two-wire extension cords or plug adaptors. • Don’t disconnect green/yellow safety-earth ground wire that connects the ground lug of the power receptacle to the chassis ground. • Don’t plug in the power cord until directed by the installation instructions. •...
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Page 3: Table Of Contents
TABLE OF CONTENTS 5.3.3 Peripheral Drive ........5-1 SECTION 5.3.4 Motor Drive ..........5-1 CIRCUIT DESCRIPTION A-CONTROL 5.3.5 Analog Circuitry.........5-1 5.3.6 Display Board ...........5-1 INTRODUCTION ..........1-1 5.3.7 Fan Drive Control ........5-2 CIRCUIT DESCRIPTION ......1-1 TROUBLESHOOTING COMPONENTS....5-2 1.2.1 Analog Meter Readout .......1-1 ERROR CODES...........5-3 1.2.2 Front Panel Controls ........1-1 DIAGNOSTIC TABLES .........5-4... -
Page 4: Circuit Description A-Control
RP3. VULCAN. This knowledge is necessary to aid in trou- As the sawtooth voltage exceeds the value of the fixed bleshooting of a unit's failure and may also allow the reference voltage, amplifier U3 produces a negative user to gain greater insight into the VULCAN’s versatility... -
Page 5: Section Troubleshooting A-Control
VULCAN. If a unit is returned to the factory for to the main line (fluorescent tubes "flickering") a calibration or repair, a detailed description of the... - Page 6 SECTION - TROUBLESHOOTING - A-CONTROL Leaking capacitors will often have a decreased voltage across their terminals. NOTES: ________________________________________________ ________________________________________________ ________________________________________________ ________________________________________________ ________________________________________________ 2 – 2...
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Page 7: Block Diagram
SECTION - TROUBLESHOOTING - A-CONTROL . BLOCK DIAGRAM 120/240V 60/50Hz Power Supply Line D1,C1,R11 Cabinet Return +6.8V -8.6V Set Point Pot Comparator, Rate Control Pot Power Supply, Triac Driver Amplifier U1 Thermocouple Power Triac 25A, 400V Feedback Muffle 2 – 3... -
Page 8: Schematic
SECTION - TROUBLESHOOTING - A-CONTROL SCHEMATIC 2 – 4... -
Page 9: Control Circuit Board
SECTION - TROUBLESHOOTING - A-CONTROL . CONTROL CIRCUIT BOARD Temperature Meter Rate Control Triac Gate Connection Muffle Connections Setpoint Thermocouple Proportional Control iC Potentiometer Amplifier 2 – 5... -
Page 10: Wiring Diagram
SECTION - TROUBLESHOOTING - A-CONTROL . WIRING DIAGRAM 230V LINE CORD 230V RECEPTACLE NOTE: A1750 - 250V,20A LINE CORD GRN/YELL 120V LINE CORD CABINET 230V A-1750 230V HOOK UP HEATING PLATE DOOR SAFETY RIAC HEATSINK SWITCH 120V HOOK TRIAC UP AND 1750 MUFFLE CONTROL... -
Page 11: Section Calibration A-Control
Contact with any of these points could necessary personnel or test equipment to maintain the cause serious injury. VULCAN. If a unit is returned to the factory for calibration or repair, a detailed description of the . . TEMPERATURE... -
Page 12: Section Circuit Description -Stage
. . . + V SUPPLY VULCAN. This knowledge is necessary to aid in trou- The +12 VDC is generated from 15 watt switching power bleshooting of a unit's failure and may also allow the supply mounted onto the main control PC board. -
Page 13: Troubleshooting -Stage
5-4. If the desired results are VULCAN. If a unit is returned to the factory for obtained in each of the steps in the tables, replace D43, calibration or repair, a detailed description of the U9 or U7 as appropriate. -
Page 14: Troubleshooting Components
SECTION - TROUBLESHOOTING - -STAGE . . FAN DRIVE (OPTIONAL ACCESSORY) . . TRIAC The 12V DC fan is controlled by a FET device which is The gate to power line return voltage (K1) under load activated by the microprcessor. At its highest setting measures typically 1-2 Vac, while the MT2 to return (9), the fan receives the full 12V DC. -
Page 15: Error Codes
SECTION - TROUBLESHOOTING - -STAGE . ERROR CODES MUFFLE OVER TEMPERATURE The controller monitored a temperature above °C. This could mean a faulty thermocouple (mV reading too high) or an erratic thermocouple performance (the temperature readout is not stable at elevated temperatures). OPEN TC DETECTED To check for open TC, turn power to furnace off and short TC input terminals. -
Page 16: Diagnostic Tables
SECTION - TROUBLESHOOTING - -STAGE . DIAGNOSTIC TABLES FURNACE SETUP COMMON ERRORS Symptom Possible Setup Error Display blank No line voltage Power switch failure J8 disconnected No Setup functions after ENTER Furnace was in start cycle at power down Muffle does not heat after power up Not in start cycle Door switch not closed No door movement after switch is pressed... - Page 17 SECTION - TROUBLESHOOTING - -STAGE . DIAGNOSTIC TABLES POWER SUPPLY Fault Setup Check Results desired No DC output and no Power off Fuse < 1 ohm DC to U11-2 (15-30V) Not shorted or open PT1 to PT4 Not shorted or open MICROPROCESSOR Fault Setup...
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Page 18: Diagnostic Tables
SECTION - TROUBLESHOOTING - -STAGE . DIAGNOSTIC TABLES PERIPHERAL DRIVE CIRCUIT Fault Setup Check Results desired All Y outputs U6-1, 2, 6 high No stuck bits Turn furnace Display/ No Error codes Off then On LED's Display OK Turn furnace D2, D3, D4, D6 Not shorted or open MOTOR DRIVE CIRCUIT... - Page 19 SECTION - TROUBLESHOOTING - -STAGE . DIAGNOSTIC TABLES ANALOG CIRCUITRY Fault Setup Check Results desired Muffle heats but YELL2 TC yellow connected display shows Gain approx. 20 same temperature 1.23V Erratic temperature 1.23V stable display U4-11 & 12 DC stable Temperature drift Hi T = 960°C 39-40mV stable...
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Page 20: Block Diagram
SECTION - TROUBLESHOOTING - -STAGE . BLOCK DIAGRAM 90-264V Switching 60/50Hz Power Supply +12V Pg 5-9 U1, U2 Thermocouple Zero Crossing AMP U1 Multiplexed A/D Microprocessor Motor Drive Pg 5-11 D1 + RT1 Pg 5-11 Cold Jct. Ref Temp Peripheral Membrane Switches Pg 5-10 Pg 5-9... -
Page 21: Schematics
SECTION - TROUBLESHOOTING - -STAGE . SCHEMATICS POWER SUPPLY 5 – 9... - Page 22 SECTION - TROUBLESHOOTING - -STAGE . SCHEMATICS TEMPERATURE CIRCUIT LCD DISPLAY CIRCUIT 5 – 10...
- Page 23 SECTION - TROUBLESHOOTING - -STAGE . SCHEMATICS MICROPROCESSOR CIRCUIT 5 – 11A...
- Page 24 SECTION - TROUBLESHOOTING - -STAGE . SCHEMATICS 5 – 11B...
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Page 25: Wiring Diagram
SECTION - TROUBLESHOOTING - -STAGE, PD, A . WIRING DIAGRAM 5 – 12... -
Page 26: Section Adjustment/Calibration -Stage
VULCAN. If a unit is returned to the factory for Note: Equal adjustment should be made on each side. calibration or repair, a detailed description of the... -
Page 27: Ordering Instructions
SECTION - SERVICE PARTS - A-CONTROL & -STAGE . ORDERING INSTRUCTIONS To order parts, select the part number required from the exploded view drawings on page 7.1. through page 7.6. The 130, 550, 1750 numbers refer to the particular size of furnace where the part number is different depending on the size. -
Page 28: Muffle (3-550 Pd / Air Exch)
SECTION - SERVICE PARTS - - A & - . MUFFLE ( - PD & AIR EXCH) MUFFLE INSULATION HEATING PLATE ASSY (9493780), 550 PD 230V (9493364), 550 PD 100, 120V (9493470), 550PD THERMOCOUPLE (9493342) 550 PD FLOOR TRAY (9353057), 550 MUFFLE ASSY COMPLETE:(Includes muffle insulation, and 2 heating plates) 230V (9493778), 550 PD... -
Page 29: Cabinet Parts
SECTION - SERVICE PARTS - A-CONTROL, -STAGE, - CABINET PARTS NOTE: To convert to configurations shown, 9495115 - Retrofit Kit, is available for furnaces built prior to S/N 0626xxx. (9493534) REAR PANEL 3-550PD FURNACE CABINET ASSY (9493320) 130 FURNACES (9493354) 550 FURNACES POWER CORD (120 &... -
Page 30: Door Parts
SECTION - SERVICE PARTS - A-CONTROL, -STAGE . CABINET PARTS FAN ASSY (9493986) 3-550A, 3-1750A FAN DUCT ASSY (9493970) 3-550A, 3-1750A . DOOR PARTS DOOR SPRING (9493368), 130 (9493908), 550 (9492754), 1750 (2 PL) SCREW 10-32 x .50 KEP (4 PL) DOOR BOTTOM (9493313), 130 (9493351), 550... -
Page 31: A-Controller Parts
SECTION - SERVICE PARTS - A-CONTROL . A- CONTROLLER PARTS FUSE (20A) - S/N 9525 and SCREW, 6-32 x .375 CONTROL PCB 9320072 earlier (R9493348) 100-120V A-130 RELAY, (1750 ONLY) (R9493449) 200-240V A-130 (9320075) (R9493349) 100-120V A-550 (R9493450) 200-240V A-550 (R9493451) 200-240V A-1750... -
Page 32: 3-Stage & 3-550 Controller Parts
SECTION - SERVICE PARTS - -STAGE, - -STAGE CONTROLLER PARTS CONTROL PCB, 3-550 PD,A SCREW, 6-32 x .375 (R9493446) 100-125V Replaced by R9495232 (Not Shown) (R9493447) 200-240V SCREW, 6-32 x 1.75 TERMINAL BLOCK (9390487) TC WIRES DISPLAY PCB (R9493347) FUSE (1A) TRIAC 9320071 (9303015) -
Page 33: Lift Mechanism Parts (3-550Pd)
SECTION - SERVICE PARTS - - LIFT MECHANISM PARTS NUT, 1/4-20 HEX SCREW, 10-32 SEM BRACE PIVOT ARM (9493363) BRACKET, MOTOR LINKAGE (9493532) BOLT, SHOULDER .375 SCREW, #8-32 SEM BRACKET, MOTOR (9493362) SCREW #8 X.375 SCREW, #8 X .50 BRACKET, SPRING MOTOR POWER DOOR (9493777) SCREW, 1/4-20... -
Page 34: Disassembly/Reassembly
SECTION - DISASSEMBLY/REASSEMBLY - -STAGE . CONTROL DRAWER REMOVAL . TRIAC TOOLS: TOOLS: Phillips #2 screwdriver Phillips #2 screwdriver, 1/4" nut driver, needle nose pliers - To gain access to the electrical components and most . . : Follow steps 8.1.1 through 8.1.2 of CONTROL DRAWER other service jobs, removal of the control drawer is REMOVAL required. -
Page 35: Membrane Switch
SECTION - DISASSEMBLY/REASSEMBLY - -STAGE . MEMBRANE SWITCH TOOLS: Phillips screwdriver Knife of other sharp edged device . . : Follow steps 8.1.1 through 8.1.2 of CONTROL DRAWER REMOVAL Control PCB Membrane Switch Control Drawer . . : Place the new membrane switch by locating the bottom edge against the bottom of the recess. -
Page 36: Display Pcb
SECTION - DISASSEMBLY/REASSEMBLY - -STAGE . DISPLAY PCB TOOLS: Phillips screwdriver CAUTION! Use proper ESD grounding techniques when handling electronic components . . : Follow steps 8.1.1 through 8.1.2 of CONTROL DRAWER REMOVAL . . : Connect grey ribbon connector. Bend away from Display PCB so it won't cut into ribbon. -
Page 37: A-Control Pcb
SECTION - DISASSEMBLY/REASSEMBLY - A-CONTROL . A-CONTROL PCB TOOLS: Phillips screwdriver Needle nose pliers 3/8" nut driver or wrench 1/4" nut driver 13 mm nut driver or pliers CAUTION! Use proper ESD grounding techniques when handling electronic component . . : Remove knob by pulling out and nut (13mm nut driver or pliers). -
Page 38: Stage Control Pcb
SECTION - DISASSEMBLY/REASSEMBLY - -STAGE . A STAGE CONTROL PCB - TOOLS: Phillips screwdriver, Slotted screwdriver, Needle nose pliers CAUTION! Use proper ESD grounding techniques when handling electronic components . . : Remove thermocouple wires . . : Follow steps 8.1.1 through 8.1.2 of CONTROL DRAWER REMOVAL. - Page 39 SECTION - DISASSEMBLY/REASSEMBLY . B STAGE CONTROL PCB – CAUTION! TOOLS: Use proper ESD grounding techniques when handling Phillips & Slotted Screwdrivers, Needle Nose Pliers components Follow steps 8.1.1 through 8.1.2 of Control Drawer REMOVAL Figure 1 - Disconnect wires from Figure 2 - Disconnect Ribbon Cables Figure 3 - Remove Relay Wires Power Switch...
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Page 40: Door Assembly/Adjustment
SECTION - DISASSEMBLY/REASSEMBLY . DOOR ASSEMBLY/ ADJUSTMENT TOOLS: 5/32 Allen wrench Phillips head screwdriver If the door feels too stiff or too loose when lifting up and down, a tension adjustment can be made from the outside. . . : If door or door insulation needs replacement, remove the 4 screws on bottom of door (step 5.7.2) and slide from slide out assy. -
Page 41: Heating Plates
SECTION - DISASSEMBLY/REASSEMBLY . HEATING PLATES TOOLS: Phillips head screwdriver Small putty knife Note: Like the headlights on a car, if one heating plate burns out, the other will likely burn out soon. Brake bond with Therefore, it would be advisable to replace both putty knife plates at once. - Page 42 SECTION - DISASSEMBLY/REASSEMBLY . COMPLETE MUFFLE REPLACEMENT TOOLS: Phillips head screwdriver; small flat head screwdriver; needle nose pliers WARNING: Disconnect power from the wall outlet before attempting to service the furnace! . . : Follow steps 8.1.1 - 8.1.2 of CONTROL DRAWER REMOVAL.
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Page 43: Muffle Replacement
100V 120V 200-240V Note: All 1750 furnaces and all furnaces with S/N date codes A-130, 3-130 11.5 ohms 11.5 ohms 32 ohms after 9701 will have rear access panel so that muffle will not A-550, 3-550... - Page 44 SECTION - DISASSEMBLY/REASSEMBLY COMPLETE MUFFLE REPLACEMENT TOOLS: Phillips head screwdriver; bladed screw driver; needle nose pliers . . : Follow steps 8.1.1 - 8.1.2 of CONTROL DRAWER REMOVAL. REMOVE SCREWS . . : Close door and remove 6 screws on the front top of the furnace.
- Page 45 SECTION - DISASSEMBLY/REASSEMBLY THERMOCOUPLE ( - TOOLS: bladed screwdriver bracket phillips head screwdriver 1/4" nutdriver WARNING: Wraparound Disconnect power from the wall outlet Front Panel before attempting to service the furnace! . . : Front panel must insert into offset bracket in wraparound .
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Page 46: Power Switch
SECTION - DISASSEMBLY/REASSEMBLY POWER SWITCH Remove 2 screws TOOLS: Slotted screwdriver . . : Follow steps 8.1.1 through 8.1.2 of CONTROL DRAWER REMOVAL . . : Disconnect switch wires . . : Remove the 2 screws which support rear panel. . - Page 47 SECTION - DISASSEMBLY/REASSEMBLY POWER DOOR MOTOR REPLACEMENT . . : Disconnect wires (Female quick connect terminals) from motor. Disconnect wires . . : Slide control drawer forward using steps 8.1.1 and 8.1.2 . . : Slide muffle assembly forward using steps 8.1.3, 8.9.4, 8.9.5 and 8.9.6 (approximately 5 inches).
- Page 48 PRODUCT SERVICE: Three methods of product service are available: • Telephone assistance available at the number listed below. • Return the unit for servicing using the instructions below. BEFORE RETURNING THE UNIT: • Call DENTSPLY for a PR (Product Return) number. This is used to track and identify your unit. Equipment received without this number may not be identifiable.
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Questions and answers
no power to heating element, checked power across the heating element no power
Possible causes for the heating element of a Vulcan-Hart A-130 to have no power include:
1. A blown fuse on the controller PCB.
2. A failed heating element plate (especially in low voltage models where plates are wired in parallel).
3. A faulty thermocouple with shorts to the cabinet.
4. A malfunction in the control circuit, such as a defective triac or power supply issue.
5. A problem in the microprocessor section if the furnace is totally nonfunctional.
This answer is automatically generated
Hi, my burnout furnace is having some switch issues when turning on and I was wondering if there was an easy solution. When the switch is flipped to the on position, the furnace nor the light comes on but if I put pressure on the panel then they will come on. Is this a faulty switch or a loose connection that I would be able to take off and replace or re-solder?