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Market Forge Industries 2500 HE, Service & Parts Manual, Page: 19 / 37

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Market Forge Industries 2500 HE Service & Parts Manual Download Page 19

TROUBLESHOOTING 

TABLE 5-2 

ELECTRICAL FAULT ISOLATION GUIDE 

FAILURE

 

FAULT LOCATION

 

1. Will not operate when thermostat is set.

 

a. Incoming power

 

 

b. Door switch

 

 

c. Faulty thermostat

 

 

d. Wiring

 

 

e. Ignition system control board

 

 

f. Ignition electrode

 

 

g. Gas valve solenoid

 

2. Intermittent operation of burners

 

 

a. Damaged control system. 

Refer to paragraph 

     5.4.3. 

 

b. Thermostat malfunction

 

3. Indicator light off (system operating)

 

a. Indicator light

 

 

b. Wiring

 

4. System fails to operate upon pressing RESET

 

a. RESET switch

 

     switch

 

b. Wiring

 

5. Convector fan fails to operate

 

a. Circuit breaker

 

 

b. On-Off switch

 

 

c. Door switch

 

 

d. Fan motor

 

 

 

 

 

Figure 5-1. Wiring Diagram 

the interconnecting wiring is complete and not 
damaged, the trouble is due to a malfunction of the 
components on the ignition control board. 
Components on the control board are not replaceable 
and a damaged control board must be replaced as a 
functional unit. The following paragraphs outline 
possible problems and symptoms that may be 
encountered during the normal use of the oven. 

CAUTION 

IF A CONTROL BOARD IS REPLACED, BE SURE 
THAT THE HIGH VOLTAGE LEAD OF THE 
ELECTRODE IS CONNECTED TO TERMINAL E1 
AND THE LOW VOLTAGE LEAD IS CONNECTED 
TO TERMINAL E2 OF THE CONTROL BOARD. 

 

 

 

5-3 

Summary of Contents for 2500 HE

Page 1: ...Oven MARKET FORGEindustries Inc Employee Owned Company World Headquarters 35 Garvey Street Everett MA 02149 Tel 617 387 4100 Fax 800 227 2659 U S Except MA or 617 387 4456 In MA Form No S 2207 6 94 Printed in U S A Models 2500 HE 2700 HE 2592 HE 2792 HE ...

Page 2: ...Connection 2 3 63 Adjustment Procedures 6 1 25 Ventilation 2 5 631 Oven Door Adjustments 6 1 251 Flue Deflector Installation 2 5 632 Thermostat Calibration 6 2 26 Installation Check Out 2 5 64 Repair and Replacement 6 2 261 Initial Control Settings 2 5 641 Control Panel Removal 6 2 262 Oven Check Out 2 5 642 Right Side Panel Removal 6 3 263 Shut Down Procedure 2 6 643 Fan Blade Removal 6 3 644 Bur...

Page 3: ...ssembly 7 8 7 5 Ignition Control Board Assembly 7 10 LIST OF TABLES Table Page Table Page SECTION 3 OPERATION SECTION 5 TROUBLE SHOOTING 3 1 Control Panel Components 3 3 5 1 General Trouble Shooting Guide 5 1 5 2 Electrical Fault Isolation Guide 5 2 Figure Page SECTION 1 INTRODUCTION 1 1 High Efficiency Gas Convection Oven 1 2 SECTION 2 INSTALLATION 2 1 7 Stand 2 1 2 2 28 Stand 2 2 2 3 Stacked Ove...

Page 4: ...rning buzzer and ignition and motor reset switches The unit is available in a variety of mounting configurations 7 178mm counter stand 28 711mm modular base open stand on legs with shelf and optional storage rack or stacked on top of another HE oven with the bottom unit on 6 152mm stainless steel legs 1 2 BASIC FUNCTIONING The HE oven becomes operational when the power switch is placed in the ON p...

Page 5: ... 02149 Telephone 617 387 4100 Product Service Department Market Forge Canada Ltd 1375 Aimco Blvd Unit 5 Mississauga Ontario Canada L4W 1B5 Telephone 416 621 9252 The model and serial numbers must be referenced when corresponding with Market Forge The data plate with serial number is located on the center of the bottom front trim ledge Figure 1 1 High Efficiency Gas Convection Oven on Optional Stan...

Page 6: ...dular Base 1 Screw adjustable feet into cabinet base 2 Mount oven to base using four 3 8 16 x 3 4 Ig hex head cap screws and four plain washers provided 3 Proceed to subsection 2 3 2 2 3 Oven on 28 711mm Open Stand 1 Place top frame Figure 2 2 2 upside down on a clean smooth surface 2 Place into position front and rear angle as semblies 8 stainless only and legs 1 3 Align holes in legs frame and a...

Page 7: ...Figure 2 2 28 711mmi Open Stand Inverted for Assembly Figure 2 3 Stacked Ovens ...

Page 8: ...tallation must conform with the National Fuel Gas Code ANSI Z223 1 1974 or CSAB1491 installation codes where applicable 2 3 1 Placement Allow 2 51mm clearance from side wall and rear wall if adjoining wall is combustible Allow 6 152mm clearance on right from another gas fired heat generating piece of equipment unless the equipment is another Market Forge High Efficiency Oven in which case no spaci...

Page 9: ...onduit connection or equivalent 10 amps per oven Use wire suitable for at least 90 C G 3 4 19mm I P S Gas Connection Inlet Standard GA 3 4 19mm I P S Gas Connection Inlet Alternate H 1 3 4 44mm dia access holes for 1 Alternate gas supply connection GA 2 Access to electrical junction box ...

Page 10: ...trouble shooting guides in section 5 for corrective action Before making this check out the operator must be thoroughly familiar with the operating procedures in Section 3 and with the function of each control described in Table 3 1 Reference Figure 3 1 for identification of controls 2 6 1 Initial Control Settings Power switch and thermostat dial are in OFF position 2 6 2 Oven Check Out A final ch...

Page 11: ...cedure 1 For daily shut down place thermostat dial and power switch in OFF position 2 For extended shut down place thermostat dial and power switch in OFF position Close external gas supply shut off valve Leave doors ajar ...

Page 12: ...ndicator light on off on to obtain even temperature throughout oven Total time approximately 15 minutes 3 2 2 Cooking The oven is ready for cooking use when the indicator light goes off The load should be adjacent to the oven so that doors will be open as short a time as possible during loading 1 Load oven If using oven for long term roasting of meats fish or poultry place about a quart of water i...

Page 13: ...HIGH EFFICIENCY CONVECTION OVEN 3 2 ...

Page 14: ...ute Timer 4 Power Switch Controls power to control circuits and convector fan Must be in ON position for oven to operate 5 Indicator Light Indicates when lit that burners are operating Cycles on and off with thermostat control 6 Ignition Reset Resets direct spark ignition system If burners do not ignite after 3 3 seconds of ignition sparking system locks out closing gas valve Buzzer will sound Pre...

Page 15: ...TION VENT CIRCUITS With electrical power applied gas supply valve open and the power switch on electrical control circuits are activated to energize the burner electrodes Gas passes through the regulator and valve to the burner orifices Primary air enters the burner tubes through shutter openings and mixes with the gas which is ignited by the ignition electrodes The flame heats a baffle plate moun...

Page 16: ...ble from 200 475 F 94 246 C Theovenis put into an automatic heating cycle with the setting of the thermostat to any of its calibrated temperature settings Expansion and contraction of gas with in the cap illary bellows system in response to temperature change opens and closes the thermostat contacts energizing and de energizing the ignition control system 4 3 1 3 Direct Spark Ignition System The d...

Page 17: ...CTOR FAN FAILS TO OPERATE a Power to oven is off Locate external circuit breaker for power and place in ON position b Control circuit breaker open Press MOTOR RESET c Right oven door open Close door d ON OFF switch off Place in ON position e Faulty circuit breaker power Test each component and connecting wiring Re switch door switch fan motor or place as required wiring 2 GAS BURNERS FAIL TO IGNIT...

Page 18: ...shown in Figure 5 1 Figure 4 2 shows the circuit schematically 5 4 1 Incoming Power Before trouble shooting any of the electrical parts or assemblies make sure power is being supplied to the junction box Figure 7 1 11 With power connected to the oven an a c voltmeter is used to measure 120 volts across terminals to lines coded L1 hot lead to wi re 1 and L2 neutral lead to wire 11 Make sure the uni...

Page 19: ... b Wiring 5 Convector fan fails to operate a Circuit breaker b On Off switch c Door switch d Fan motor Figure 5 1 Wiring Diagram the interconnecting wiring is complete and not damaged the trouble is due to a malfunction of the components on the ignition control board Components on the control board are not replaceable and a damaged control board must be replaced as a functional unit The following ...

Page 20: ...r inadvertent grounding They should be at least 1 2 from metal objects which can cause arcing to ground If the electrode or lead wires are faulty replace with new components 5 4 3 4 Malfunction Of Gas Valve If the board is receiving proper power and sparking occurs during the trial for ignition period but the valve does not open check the valve for an open coil or other malfunction Be sure Figure ...

Page 21: ...he oven operating If voltage of 120 volts is present the valve is defective and must be replaced as a unit If 120 volts is not present and all wiring connections are tight the ignition control board is defective and must be replaced 5 4 6 Wiring All the electrical components of the HE oven ON OFF switch door switch thermostat control gas solenoid valve RESET switches ignition control board and ind...

Page 22: ...up and out toward center of oven Wash rinse and dry 3 Remove fan guard Figure 6 1 by lifting up and out Wash rinse and dry 4 Wash interior sides bottom and top with mild detergent and water A stainless steel cleaner not polish should be used for the interior Rinse and dry 5 Replace fan guard shelf supports and shelves 6 Wash both sides of doors using a stainless steel cleaner Rinse and dry 6 3 ADJ...

Page 23: ...r counter clockwise down as required Top of doors should be level with each other and equally spaced between top and bottom trim 4 Retighten the two hex nuts 6 3 2 Thermostat Calibration If the oven components are operating but the unit is not cooking properly the thermostat may need calibration To calibrate proceed as fol lows 1 Attach a thermocouple lead to the bulb of the thermostat and close o...

Page 24: ... Remove wheel puller from fan blade and reinstall replacement fan on motor shaft as required 6 4 3 2 Fan Motor Removal Motor removal is completed from inside the oven With external circuit breaker shut off proceed as follows 1 Remove fan guard Fig 7 1 18 Figure 6 2 Wheel Puller Kit Components 2 Remove four nuts 17 and clips 16 from motor assembly 3 Pull motor forward carefully disconnect electrica...

Page 25: ...ard remove control panel See subsection 6 4 1 1 Disconnect high and low voltage electrodes and wires to reset switch gas valve and terminal strip 2 Remove screws nuts lockwashers and spacers from board Remove control board 6 5 ADJUSTMENTS AND OPERATIONAL CHECKS OF BURNER COMPONENTS During normal use or when parts are replaced certain adjustments must be made to gas burners pressure regulator and e...

Page 26: ...MAINTENANCE Figure 6 3 Air Shutter Adjustment 6 5 ...

Page 27: ... 2 ORDERING INFORMATION Orders for repair parts should be directed to the nearest authorized parts distributor For a current Market Forge Authorized Parts Distributor List contact Customer Service Department Market Forge 35 Garvey Street Everett Massachusetts 02149 Telephone 617 387 4100 Customer Service Department Market Forge Canada Ltd 1375 Aimco Blvd Unit 5 Mississauga Ontario Canada L4W 1B5 T...

Page 28: ...Figure 7 1 Frame and Cabinet Assembly ...

Page 29: ...0 Transformer Export only 100V 9 99 1576 R H Panel Ass y Standard Enamel 10 99 4507 Connector Box Export only 11 10 5291 Terminal Box 12 99 4368 Base Ass y 13 99 4819 Control Panel Plate 14 10 6415 Control Panel Bezel 15 10 5453 Blower Wheel 16 99 0951 Clip 17 10 2335 Hex Nut 5 16 18 18 10 5957 Fan Guard INSULATION 19 10 8212 Bottom Rear Insulation Maronite 20 09 5413 Rear Insulation 21 10 8219 Lt...

Page 30: ...HIGH EFFICIENCY CONVECTION OVEN Figure 7 2 Gas Burner and Manifold Assembly 7 4 ...

Page 31: ...Manifold Shield Ass y 18 10 1735 Phill Rd Hd Sheet Scr 3 8 Ig 19 10 1735 Phill Rd Hd Sheet Scr 3 8 Ig 20 99 4356 Bottom Seal Manifold Shield Ass y 21 10 1855 Pan Hd Scr Type F 8 32 x 3 8 Ig 22 10 3366 Burner Orifice 49 078 Natural Gas 23 10 3367 Burner Orifice 56 465 Propane 24 10 8226 Burner Orifice 57 043 Butane 25 10 8090 Ignition Electrode 26 99 3925 Flame Baffle Ass y Standard 26a 99 3927 Fla...

Page 32: ...7 6 HIGH EFFICIENCY CONVECTION OVEN Figure 7 3 Door Assembly ...

Page 33: ...ng 15 10 2340 Hex Nut 10 32 16 10 2509 Lock Washer 10 17 99 3562 Trip Lever Ass y 18 10 2432 Washer Med 10 19 99 1251 Insulation Shield 20 10 6859 Door Micro Switch Not Shown 21 99 3511 Door Pivot Pin Support 22 10 2523 Ext Tooth L Washer 1 4 x 3 4 O D x 035 23 10 1997 Flat Head Machine Screw 24 10 1997 Flat Head Machine Screw 25 10 2337 Hex Nut 26 10 1895 Lock Washer 27 10 1996 8 32 Ft Hd Mach Sc...

Page 34: ...HIGH EFFICIENCY CONVECTION OVEN 7 8 Figure 7 4 Control Panel Assembly ...

Page 35: ...9 5259 Knob For 5 Hour Timer 3 99 5301 Nameplate Bottom Section 3a 08 5916 Overlay For 2 Speed Switch must be ordered together with 99 5301 4 10 6415 Bezel 5 10 4714 Thermostat 6 10 5520 60 Minute Timer 7 10 5553 5 Hour Timer 8 10 5016 Indicator Light 9 10 6264 On Off Switch 10 09 8015 Reset Switch supplied with Circuit Breaker Board 11 10 6266 Motor Reset Switch 12 Amp S 2207 ...

Page 36: ...7 10 HIGH EFFICIENCY CONVECTION OVEN Figure 7 5 Ignition Control Board Assembly ...

Page 37: ...175 Socket 4a 10 9174 Mini relay 5 10 6682 Buzzer 120V 6 10 1717 Screw Rd Hd Mach 8 32 x 3 8 Ig 7 10 2420 Washer Plain 6 8 10 2330 Hex Nut 8 32 9 10 1747 Screw Rd Hd Mach 8 32 x 5 8 Ig 10 10 1849 Screw Rd Hd Mach 6 32 x 1 2 Ig 11 10 2420 Washer Plain 6 12 10 2337 Hex Nut 6 32 Must be purchased together S 2207 ILLUSTRATED PARTS LIST 7 11 ...

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