Turbo Chef Technologies 3240 manual VDC at the modulating valve coil

Page 47

 

To

From

Expected Resistance

 

 

 

 

Primary

Black

White (240 VAC Input)

28.1 W

 

 

 

 

 

Black

Blue (240 VAC Input)

53.1 W

 

 

 

 

 

Black

Red (240 VAC Input)

62.4 W

 

 

 

 

Secondary

Yellow

Yellow

0.80 W

 

 

 

 

Figure 33: Burner Transformer Ohm Chart

Combustion Blower

The combustion blower is a 3000 RPM, 208- 240 VAC, 0.33 A, 50/60 hz, blower motor. The winding resistance is 92 W. The combus- tion blower receives line voltage (208-240 VAC) from the K3 relay. Once the combustion blower reaches full speed, the air pressure switch closes, applying 24 VAC to the ignition module.

Testing Procedure

1.Disconnect line voltage from the unit.

2.Take a resistance reading of the winding; resistance should be 92 W. If resistance is incorrect, the combustion blower is damaged or defective and must be replaced (page A-14).

3.Apply line voltage to the unit and check for line voltage (208-240 VAC) applied to the winding when the unit is calling for heat and the K3 relay is closed.

4.If no voltage is present, inspect the wire harness for damage or shorts (page 45).

5.If the wire harness is intact and undamaged, the combustion blower is damaged or defective and must be replaced (page A-14).

Modulating Gas Valve

The modulating gas valve is a combination gas valve with a 24 VAC primary solenoid valve and 0.1-10 VDC modulating valve. The primary solenoid valve receives 24 VAC from the ignition module. The resistance of the primary solenoid valve is 535 k W. The modulating valve receives 0.1-10 VDC from the control board. The resistance of the modulating valve is 44 W. The modulating

valve has an adjustment shaft that adjusts the high and low flame pressure.

Testing Procedure

NOTE: See page 3 for instructions on adjusting the high and low flame gas pressure.

1.Disconnect line voltage from the unit.

2.Take a resistance reading of both coils, resistances should be 535k W and 44 W. If resistance is incorrect, the gas valve is damaged or defective and must be replaced (page A-14).

3.During warmup and cook mode, apply line voltage to the unit and check for 24 VAC at the primary solenoid coil and

0.1-10 VDC at the modulating valve coil.

4.If no voltage is present, inspect the wire harness for damage or shorts (page 45).

5.Check for 24 VAC leaving the ignition module (see Figure 35, page 28)

6.If wire harness is intact and undamaged, the modulating gas valve is damaged or defective and must be replaced (Pipe and valve assembly, page A-14).

Ignition Module

The ignition module generates 30,000 V at the spark igniter stud for direct ignition of the main burner when 24 VAC is applied. The module senses the presence of the burner flame and discontinues the ignition spark.

If the burner fails to ignite within 6 seconds, the module goes into safety lockout. If the burner does not maintain 1.5 DC uA mini- mum, the timed trial for ignition (6 seconds) is repeated and safety lockout occurs. If safety lockout occurs, power must be removed from the module before it can be restarted.

Testing Procedure

NOTE: The ignition module is different in domestic and international model ovens. Figure 34 shows the differences in the terminal labels between the two models.

27

OVEN SYSTEMS

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Contents Accelerating the World of Cooking TM Page 800.90TURBO For further information, callPage Table of Contents Oven Systems Oven ModesAppendix a Replacing Oven Components TroubleshootingSchematics Schematic Pin-out Controller CodesA F ET Y Instruc Tions Important Safety Information Please Read FirstGeneral Safety Information Preventing Oven DamageGrounding Instructions Power Cord ReplacementReducing Fire Risk I S a F ET Y Instruc Tions Specifications and Startup Page Oven Overview, Front OverviewOven Construction DimensionsPower Specifications CertificationsReading the Gas Pressure at 100% Flame Gas SetupReading the Incoming Gas Pressure Static Confirming Proper Closure of all Taps Reading the Gas Pressure at Minimum FlameReading the Operating Gas Pressure Cleaning Page Message has disappeared Daily Cleaning ProceduresYour HhC oven Pad, cleaning towels, disposable gloves Follow the steps below daily to help maintainL E a N I N G Deep Cleaning ProceduresRemove and Clean the Right and Left Lower Air Diverters Remove and Clean the Conveyor requires TWO peopleRemove and Clean the Lower End Panels Remove and Clean the Upper Nozzle PlateReinstall the Oven Components Clean the Oven InteriorStandard Oven Operation Page Oven Controls Happens When Mode 1 Oven OffMode 2 Belt Speed Select Cooking a ProductMode 6 Cooking Mode 3 LightingMode 4 Warming Mode 5 SoakingUser presses the idle key from Mode Mode 8 IdleMode during which both blowers are reduced To 30% to save power. All other ovenAdjust the air speed This page intentionally Left blank Oven Modes Page Updating the Firmware Config ModeTo access the Config MODE, press the up key Smart Card ScreenEdit Option Screen Setup ModeAccessing the Setup Mode Accessing the Test ModeInfo Screen Test ModeEnable/disable maintenance mode* -Clear the fault counts Changing the Display LanguageBlowers Bottom Display Line Entering a New Serial NumberConfirmed Erasing all Oven SettingsInitiating a Burn-In Test Viewing the Serial NumberOven Systems Page Control System Keypad is an 11-key membrane switch+V for 24 VDC with output wires Or C & no are closed when coilPower supply is damaged or defective Power Supply 24VDC InternationalDisconnect line voltage from the unit Conveyor SystemSmart Card Reader Thermostat 120ºF Close on RiseTerminals Wire harness for damage or shortsIf the resistance readings are correct Voltage applied to the motor windingsBlower System Blower Motor Ohm Chart Motor WindingsBurner System VAC installation connect wire a red to wire C blueCheck for 24 VAC leaving the ignition module see , VDC at the modulating valve coilWill isolate the burner spark rod from Using a different wire spark cable ensureApply power to the ignition module Shut off the gas supplyTroubleshooting Page Cooking profile Overview of TroubleshootingFault Code Descriptions RO U B L E S H O OT I N G This fault occurs if the conveyor belt fails to startFault Code Troubleshooting Properly connected to Reset maximum and low fire gas pressureSteps 9-13? Open the right end bellThis page intentionally Left blank Replace Wire spark Cavity temperature?Temperature Burner ignite Fault Clear?Former have 24 VAC A-14 Check YES Wiring ReplaceAdjust the 100% Air tube SwitchChassis? Troubleshooting F5 CC Over Temp CC Over TempIs the white wire Shorted toOpen the left end bell. Are the cooling fans running? Troubleshooting F6 EC Over Temp EC Over TempCheck Wiring YES YES Is the oven hot? noControl board A-8 Troubleshooting F7 RTD Fault RTD FailureTroubleshooting F8 High Limit Tripped High Limit Trip Is the wiring correct page 45?Remove the chain guard page A-6 Troubleshooting F9 Belt Fault Total Belt Run FailureCheck Wiring Switch closed?Is line voltage Blower running? Is the wiring A-8 Air switch Air tubeNon-Fault Code Troubleshooting 29-30? Cleaned? Problem starting?Correctly reinstall Codes present? Does the problem OperationA-8 Correct wiring Control board to Correct wiring Display If ribbon cable isPower? Check wiring from Verify 5 VDC is presentThis page intentionally Left blank Schematics Page CH E Mati CS C H E Mati C S Sche MAT ICS Page Appendix a Replacing Oven Components Page To Replace This Replacing Oven Components103572 No Panel Appendix a Replacing Oven Components This page intentionally Left blank Replacing Items No Panel Removal Required Part Number Hardware Description Hardware Part Numbers Replacing Items Right End Bell Blower Motor, Lower HHC-6520 Key, 3/16 0 Appendix a Replacing Oven Components Gear Drive Assembly DetailX1 each Replacing Items Left End Bell Blower Motor, Upper HHC-6520 Key, 3/16 Replacing Items Burner Compartment Cover Burner Assembly DetailReplacing Items Multiple Panel Removal Required Page Page For service or information

3240 specifications

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