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Market Forge Industries 2500 HE Service & Parts Manual

High efficiency gas convection oven
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SERVICE & PARTS MANUAL
High Efficiency Gas Convection Oven
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)
MARKET FORGE
Employee Owned Company
Form No. S-2207 6/94 Printed in U.S.A.
Models:
2500
2700
2592
2792
industries Inc
HE
HE
HE
HE

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  • Page 1 SERVICE & PARTS MANUAL High Efficiency Gas Convection Oven Models: 2500 2700 2592 2792 MARKET FORGE industries 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.

  • Page 2: Table Of Contents

    TABLE OF CONTENTS Paragraph Page Paragraph Page SECTION 1 INTRODUCTION SECTION 5 TROUBLE-SHOOTING 11 Description 51 General 12 Basic Functioning 52 Trouble-Shooting Guide 13 Service 53 Electrical Fault Isolation 54 Electrical Trouble-Shooting SECTION 2 INSTALLATION Procedures 21 Receiving 541 Incoming Power 22 Assembly 542 Electrical Inspection 221 Oven on 7"...
  • Page 3 LIST OF ILLUSTRATIONS Figure Page Figure Page SECTION 5 TROUBLE-SHOOTING SECTION 1 INTRODUCTION Wiring Diagram High Efficiency Gas Convection Oven Flame Current Meter Placement SECTION 2 INSTALLATION SECTION 6 MAINTENANCE 7" Stand Blower Guard 28" Stand Wheel Puller Kit Stacked Ovens Air Shutter Adjustment Service Connections SECTION 7 ILLUSTRATED PARTS LISTS...

  • Page 4: Description

    SECTION 1 INTRODUCTION This service and parts manual contains general information, installation, operation, principles of operation, trouble- shooting, and maintenance information for the Market Forge High Efficiency Gas Convection Oven Also included are parts lists, in which each replaceable part is identified and shown in an accompanying exploded view 1.1 DESCRIPTION 1.2 BASIC FUNCTIONING The Market Forge Model HE Gas Convection...

  • Page 5: High Efficiency Gas Convection Oven

    available to assist with prompt service. A current directory Product Service Department of Authorized Service Agencies may be obtained by Market Forge Canada Ltd. contacting: 1375 Aimco Blvd., Unit 5 Mississauga, Ontario, Canada L4W 1B5 Product Service Department Telephone (416) 621-9252 Market Forge 35 Garvey Street The model and serial numbers must be referenced when...

  • Page 6: Section 2 Installation

    SECTION 2 INSTALLATION 3. For single oven, mount oven to stand using four 2.1 RECEIVING The oven is shipped bolted to a skid and covered by 3/8-16 x 3/4 Ig hex head cap screws and four 3/8 a carton which is nailed to the skid, these must be plain washers provided carefully removed prior to installation DO NOT AT ANY 4.

  • Page 7: Stacked Ovens

    Figure 2-2 28" (711mmi Open Stand (Inverted for Assembly) Figure 2-3 Stacked Ovens...

  • Page 8: Gas Connection

    2. Tilt ovens onto left sides as seen from front to rear wall if adjoining wall is combustible Allow 6" (152mm} access bottoms DO NOT AT ANY TIME LAY THE clearance on right from another gas fired heat generating OVENS DOWN ON TOPS, RIGHT SIDES, OR piece of equipment, unless the equipment is another Market FRONTS.

  • Page 9: Service Connections

    SERVICE CONNECTIONS GAS OPERATED Electrical connection — 120 volt AC. 60 Hz. 1/2" 13mm conduit connection or equivalent 10 amps per oven Use wire suitable for at least 90°C 3/4" 19mm I.P.S Gas Connection Inlet, Standard 3/4" 19mm I.P.S Gas Connection Inlet, Alternate 1 3/4"...

  • Page 10: Ventilation

    1. Connect the power supply wires to the junction each control described in Table 3 1 Reference Figure box at the right back of the oven Use wire 3-1 for identification of controls suitable for at least 90°C Ensure that hot wire 2.6.1 Initial Control Settings connects to terminal L1 and neutral wire to L2 Power switch and thermostat dial are in OFF...

  • Page 11: Shut-Down Procedure

    2.6.3 Shut-Down Procedure 2. For extended shut-down, place thermostat dial and power switch in OFF position. Close external gas 1. For daily shut-down, place thermostat dial supply shut-off valve. Leave doors ajar. and power switch in OFF position.

  • Page 12: Section 3 Operation

    SECTION 3 OPERATION 3.1 OPERATING CONTROLS AND even temperature throughout oven Total time: INDICATORS approximately 15 minutes All the controls required to operate the oven are 3.2.2 Cooking listed in Table 3-1 with a short functional description The oven is ready for cooking use when the of each.
  • Page 13 HIGH EFFICIENCY CONVECTION OVEN...
  • Page 14 TABLE 3-1 FIGURE 3-1 REF. DESCRIPTION FUNCTION Regulates oven temperature by controlling burner operation. When Thermostat Dial set, activates gas valve and ignition system. Mechanical timer to aid operator in timing cooking cycle. Does not 60-Minute Timer control oven operation. 5-Hour Timer Same as 60-Minute Timer Controls power to control circuits and convector fan.

  • Page 15: Section 4 Principles Of Operation

    SECTION 4 PRINCIPLES OF OPERATION 4.1 GENERAL valve open, and the power switch on, electrical control The HE gas fired convection oven employs a carefully circuits are activated to energize the burner electrodes designed ventilation combustion system which achieves Gas passes through the regulator and valve to the burner optimal control of combustion products.

  • Page 16: Electrical Circuits

    4.3 ELECTRICAL CIRCUITS bar built into the door jamb of the right side door When the 120 volt a-c power is supplied to the fan motor, door is open, the bar remains retracted with the switch indicator light, and ignition control board, which in turn contacts in the normally open position.

  • Page 17: Section 5 Trouble-Shooting

    SECTION 5 TROUBLE-SHOOTING 5.1 GENERAL described in Section 3. If the problem cannot be The information in this section is intended to readily corrected, the operator should contact the assist both the operator and service personnel in nearest Market Forge Service Agency for assistance locating the general source of problems which may occur with the High Efficiency Convection Oven.
  • Page 18 TABLE 5-1 (cont ) 3. INDICATOR LIGHT FAILS TO LIGHT WITH THERMOSTAT SET, FAN OPERATING a) Indicator light burned out Replace light b) Thermostat contacts faulty Replace thermostat c) faulty wiring Check wiring from door switch to thermostat and light 4.

  • Page 19: Wiring Diagram

    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.
  • Page 20 5.4.3.1 Improper Polarity If a spark is present and the gas valve opens but the system shuts down after the trial period, check the 120 volt a c input voltage at terminals A (L1) ,and L2 of the control board for proper polarity Terminal A should be the hot side and L2 neutral with respect to ground.

  • Page 21: Thermostatic Control

    5.4.4 Thermostatic Control If voltage of 120 volts is present, the valve is defective and must be replaced as a unit If 120 volts is not 5.4.4.1 Thermostat Contacts present and all wiring connections are tight, the Defective contacts will result in failure of the ignition control board is defective and must be oven to operate properly.

  • Page 22: Section 6 Maintenance

    SECTION 6 MAINTENANCE 6.1 GENERAL This section contains both preventive and corrective maintenance information. Preventive maintenance may be performed by maintenance personnel at the establishment in which the oven is installed. It is recommended that user personnel never attempt to make repairs without the assistance of an authorized service agency.

  • Page 23: Thermostat Calibration

    HIGH EFFICIENCY CONVECTION OVEN 6.3.2 Thermostat Calibration 6.3.1.2 Door Switch Adjustment If the oven components are operating but the unit 1. Remove upper oven trim strip by removing four is not cooking properly, the thermostat may need screws (Fig 7-3, #1 & 2) left and right calibration To calibrate, proceed as fol lows 2.

  • Page 24: Right Side Panel Removal

    MAINTENANCE 2. Remove panel carefully to avoid damaging connections WARNING Controls carry 120 volts Be sure that ex ternal circuit breaker is shut off before removing panel to avoid accidental shock or short circuit 6.4.2 Right Side Panel Removal Remove four screws from rear of right side panel Remove six screws from control panel Remove right side panel to gain access to gas valve and regulator Gas valve and regulator may also be...

  • Page 25: Electrode Removal

    HIGH EFFICIENCY CONVECTION ION OVEN 6.4.4.2 Flame Baffle Assembly Removal 1. Disconnect high and low voltage electrodes and Remove burner pan assembly (see subsection 6. wires to reset switch, gas valve, and terminal strip 4.4) to access flame baffle assembly (Fig 7-2 26.) 2.

  • Page 26: Air Shutter Adjustment

    MAINTENANCE Figure 6-3. Air Shutter Adjustment...

  • Page 27: Section 7 Illustrated Parts Lists

    SECTION 7 ILLUSTRATED PARTS LISTS 7.1 GENERAL 7.2 ORDERING INFORMATION This section contains a complete listing of all Orders for repair parts should be directed to the nearest authorized parts distributor. For a current Market replaceable parts of the High Efficiency gas con- Forge Authorized Parts Distributor List contact: vection oven.
  • Page 28 Figure 7-1. Frame and Cabinet Assembly...
  • Page 29 ILLUSTRATED PARTS LIST FIG. 7-1 INDEX NO. PART NO. DESCRIPTION 99-3932 Motor Ass'y - 60 Hz 115/230V 99-1925 Clip 10-1295 Rack Support - Standard 10-1296 Rack Support - Deep 99-1579 L/H Panel Ass'y - Standard - Enamel 99-1578 L/H Panel Ass'y - Deep - Enamel 99-4431 Top Panel - Standard - Enamel 99-4429...
  • Page 30 HIGH EFFICIENCY CONVECTION OVEN Figure 7-2. Gas Burner and Manifold Assembly...
  • Page 31 ILLUSTRATED PARTS LIST FIG. 7-2 PART NO. DESCRIPTION 10-7694 Gas Valve - Magnetic Solenoid 09-1150 Pressure Regulator - Natural 09-1151 Pressure Regulator - Propane 99-4424 Cross & Bracket Ass'y 10-3258 Gas Burner 99-3968 Manifold Ass'y 99-4349 Burner Pan Ass'y (Standard) 99-4366 Burner Pan Ass'y (Deep) 10-2400...
  • Page 32 HIGH EFFICIENCY CONVECTION OVEN Figure 7-3. Door Assembly...
  • Page 33 7- 7 ILLUSTRATED PARTS LIST FIG. 7-3 PART NO. DESCRIPTION 10-1717 Rd Hd Mach Scr #8 - 32 x 3/8 10-1956 Phil Truss Hd Type 'A' #8 x 3/8 10-2341 Washer - Thin #10 10-1759 Rd Hd Mach Scr #10 - 32 x 3/8 Ig. 10-2509 Lock Washer #10 10-2432...

  • Page 34: Control Panel

    HIGH EFFICIENCY CONVECTION OVEN Figure 7-4 Control Panel Assembly...
  • Page 35 ILLUSTRATED PARTS LIST FIG. 7-4 PART NO. DESCRIPTION INDEX NO. 99-4209 Control Panel Assembly—Complete (excluding thermostat) 10-6307 Knob 09-5270 Knob, For (60) Mm. Timer 09-5259 Knob, For (5) Hour Timer 99-5301 Nameplate—Bottom Section 08-5916 Overlay For (2) Speed Switch (must be ordered together with 99-5301) 10-6415 Bezel 10-4714...
  • Page 36 HIGH EFFICIENCY CONVECTION OVEN 7-10 Figure 7-5. Ignition Control Board Assembly...
  • Page 37 ILLUSTRATED PARTS LIST 7-11 FIG. 7-5 PART NO. DESCRIPTION ITEM NO. 95-4465 Bracket for Control Board & Buzzer 10-8258 Ignition Control Board 10-6512 Socket 10-9175 Socket* 10-9174 Mini-relay* 10-6682 Buzzer 120V 10-1717 Screw, Rd. Hd. Mach. #8 - 32 x 3/8" Ig. 10-2420 Washer, Plain #6 10-2330...

This manual is also suitable for:

2700 he2592 he2792 he

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