Service & Parts Manual 4/1979

Transcript

SERVICE & PARTS MANUAL Pressureless Steam Cooker Models: 3500 3550 MARKET FORGE CANADA LTD. Mississauga, Ontario, Canada Form No. S-2196 4/79 Printed in U.S.A. TABLE OF CONTENTS Paragraph Page Paragraph Page 1.1 1.2 1.3 SECTION 1 INTRODUCTION Description Basic Functioning Service 1-1 1-1 1-2 2.1 2.2 2.3 2.4 2.4.1 2.4.2 2.4.3 SECTION 2 INSTALLATION Assembly Setting In Place Mechanical Connections Installation Check-Out Initial Control Settings Cooker Check-Out Shut-Down Procedure 2-1 2-1 2-1 2-1 2-1 2-1 2-2 3.1 3.2 3.2.1 3.2.2 3.2.3 3.2.4 3.3 SECTION 3 OPERATION Operating Controls and Indicators Operating Procedures Steam Source Operation Preheating Cooking Shut-Down Procedure Cleaning 3-1 3-1 3-1 3-1 3-1 3-1 3-2 4.1 4.2 4.2.1 4.2.2 4.2.3 4.2.4 4.3 4.3.1 SECTION 4 PRINCIPLES OF OPERATION General Plumbing Circuits Steam Inlet Line Steam Exhaust and Drain Lines Steam Exhaust Condensing System Pressure Safety Valve Electrical Circuits Control Circuit Components 4-1 4-1 4-1 4-1 4-1 4-2 4-2 4-3 SECTION 5 TROUBLE-SHOOTING 5.1 General 5.2 Trouble-Shooting Guide 5.3 Electrical Fault Isolation 5.4 Electrical Trouble-Shooting Procedures 5.4.1 Incoming Power 5.4.2 Electrical Inspection 5.4.3 Selector Switch 5.4.4 15-MINUTE Timer 5.4.5 60-MINUTE Timer 5.4.6 Door Interlock Switch 5.4.7 Steam Solenoid Valves 5.4.8 Indicator Lights 5.4.9 Cooking Compartment Thermostat Switch 5.4.1.0 Buzzer 5.4.1.1 Cold Water Condenser Circuit 5.4.1.2 Wiring SECTION 6 MAINTENANCE General Preventive Maintenance Door Disassembly and Cleaning Door Latch Lubrication Cooking Compartment Cleaning Repair and Replacement Door Assembly Exterior Panel Removal Steam and Water Solenoid Valve Replacement 6.4 Door Adjustment 6.4.1 Latch Adjustment 6.4.2 Door Tension Adjustment 6.1 6.2 6.2.1 6.2.2 6.2.3 6.3 6.3.1 6.3.2 6.3.3 5-1 5-1 5-2 5-2 5-3 5-3 5-4 5-5 5-5 5-5 5-5 5-5 5-6 5-6 5-6 5-6 6-1 6-1 6-1 6-1 6-1 6-2 6-2 6-2 6-2 6-3 6-3 6-3 SECTION 7 ILLUSTRATED PARTS LIST 7.1 7.2 7.3 General Ordering Information Index of Illustrated Parts List 7-1 7-1 7-1 LIST OF ILLUSTRATIONS Figure 3-1 3-2 4-1 4-2 5-1 5-2 Page SECT ION 3 OPERATION Controls & Indicators Pan Support Removal Figure SECTION 6 MAINTENANCE 6-1 Inner Door Removal 6-2 Control Panel Removal 6-3 Plumbing and Interior View 6-4 Latch Adjustment 3-2 3-3 SECT ION 4 PRINCIPLES OF OPERATION Pictorial Diagram — Steam & Water Circuits 4-2 Pictorial Diagram — Electrical Circuits 4-3 SECT ION 5 TROUBLE-SHOOTING Wiring Diagram, Model 3500 Schematic Diagram, Model 3500 Page 7-1 7-2 7-3 7-4 SECTION 7 ILLUSTRATED PARTS LIST Cabinet Assembly Door Assembly Plumbing Assembly Control Panel 6-1 6-2 6-3 6-3 7-2 7-4 7-6 7-8 5-4 5-7 LIST OF TABLES Table Page Table SECTION 3 OPERATION 3-1 Controls and Indicators Page SECTION 5 TROUBLE-SHOOTING 3-3 5-1 5-2 General Trouble-Shooting Guide Electrical Fault Isolation Guide 5-1 5-3 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 3500 and 3550 Pressureless Steam Cookers. Also included is a parts list in which each replaceable part is identified and shown in an accompanying exploded view. 1.1 DESCRIPTION 1.2 BASIC FUNCTIONING The Model 3500 is a pressureless steam cooker consisting of two independently controlled compartments enclosed in a single cabinet. The model 3550 includes a single compartment. Each compartment is equipped with a separate two-piece door with inner gasket plate isolated from the exterior surface. Door latches operate by cam action for positive sealing of inner door in one continuous hand motion. Steam and steam condensing circuits are electrically controlled. Operating controls are displayed on a single front-mounted panel, and include separate timers with indicator lights for selection of either 15-minute precision timed cooking or 60-minute long duration cooking. The Model 3500 may be operated with only one compartment in use, or, both may be used simultaneously (The 3550 has only one compartment). Each compartment is equipped with identical controls allowing selection of either 15MINUTE TIMER or 60-MINUTE TIMER operation by setting a two-position switch. The cooker becomes operational when the selector switch is set to either timer position, the timer is set at the desired cooking time, and the compartment door is closed. The timer indicator light comes on and the steam solenoid valve opens allowing steam to flow into the compartment through a slotted steam standpipe. A separate steam source required for operation of the Pressureless Cooker is normally purchased with it, in which case the cooker is factory mounted with all steam, drain, cold water and electrical interconnections completed. Model 3500/Boiler and 3550/ Boiler configurations with the cookers on 24-inch wide cabinet bases containing electrically powered steam boilers (model suffix E)are on the cover. Other applications include the 3500 or 3550 Cooker on a gas-fired boiler (model suffix G), a steam coil boiler (model suffix SC), or a cabinet containing steam and drain controls for direct connection to a remotely located boiler (model suffix D). The Model 3500 may also be mounted on larger boiler cabinets or be combined with other cooking equipment. Model 3550 utilizes the same boiler cabinets, designated by the same suffixes as for the 3500. 1-1 S-2196 When steam flowing inside the compartment has raised the interior temperature to 212°F, the contacts of a thermostatic switch automatically close, completing the circuit to the timer motor and starting the cooking time period. At the end of the set interval, timer contacts switch to shut off the cooking operation and sound a signal buzzer. The buzzer is silenced by returning the timer dial to the OFF position. Steam emitted from the compartment along with liquid cooking drainage is directed through a drain screen inside the compartment into the cooker drain line. A cold water solenoid valve connected into the cooker drain line is automatically actuated by a thermostatic switch in the boiler drain to condense the steam to water prior to discharge into the boiler drain. PRESSURELESS STEAM COOKER 1.3 SERVICE Required service, both preventive and corrective, is explained in Section 6. Should repairs be required, a network of authorized agencies is available to assist with prompt service. A current Directory of Authorized Service Agencies may be obtained by contacting: Product Service Department Market Forge 35 Garvey Street Everett, Massachusetts 02149 Telephone: (617) 387-4100 S-2196 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 containing the serial number pertaining to the equipment is located on the lower front trim of the cabinet. SECTION 2 INSTALLATION 2.1 ASSEMBLY Installation Instructions for each. Procedures for the cooker only are included in subsection 2.4.2. If the cooker fails to perform as described, consult Table 5-1 of the Trouble-Shooting Guide for corrective action. If difficulty arises with the boiler, reference the separate service and parts manual for that equipment. The Pressureless Cooker is factory mounted on a cabinet base containing either a steam boiler or direct steam connection controls for the cooker. The assembled unit is shipped bolted to a skid with cabinet feet in a separate container. Steps required for assembly are as follows: 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 required in the following procedures. 1. Remove the four bolts which fasten the equipment frame to the skid. 2. Install feet in threaded mounting locations of the cabinet frame. 3. Mount the two pan support racks on studs located inside the cooking compartment. 4. Attach panels to lower cabinet. Detailed instructions are enclosed with the panels. 2.4.1 Initial Control Settings Before beginning the start-up procedures for the cooker, the instruction plate and service manual for the steam boiler must be consulted and all start-up procedures completed to supply 15 PSI steam to the steam inlet line for the cooker. 2.2 SETTING IN PLACE If possible a location should be selected under an exhaust hood which will remove small amounts of water vapor emitted when the cooker doors are opened. Level the unit in final location by turning the adjustable feet. Using the cabinet top as a reference, obtain level adjustment left-to-right and front-to-back. 1. All steam boiler controls are in the operating mode and 15 PSI steam is applied to the cooker inlet plumbing. 2. Cooker timers for both compartments (Figure 3-1; 3, 4) are in the OFF position. 3. Cooker compartments are empty of all information materials, pan supports are mounted i n place and doors are open. 2.3 MECHANICAL CONNECTIONS Since the Pressureless Cooker is interconnected at the factory to the steam boiler or direct steam plumbing, no field connections are required to the cooker. All electrical and plumbing connections are routed to the steam boiler cabinet through the 6-inch high space between the floor and the bottom edge of the cabinet frame. Connection locations for the cooker mounted on steam boilers of electric, gas and steam coil utility and direct connected steam are shown in separate Installation Instructions for each. 2.4.2 Cooker Check-Out The cooker check-out procedures are as follows: 1. Place selector switches (Figure 3-1, 2) in 15 MINUTE TIMER (up) position. 2. Set 15-Minute Timers (3) to about the "4-minute" position. Observe that indicator lights are off and steam does not enter compartments. 3. Close cooker compartment doors being certain latch handles (1) are in the down position and latches are securely engaged. Observe that indicator lights turn on and steam can be heard rushing into the compartment simultaneously with the door closing. 4. Observe the boiler drain line for passage of steam into the open floor drain. Correct steam condenser operation is evidenced by presence of water flowing from the drain line. 2.4 INSTALLATION CHECK-OUT After the Cooker is completely assembled and all mechanical connections made to its steam source (steam boiler or direct steam connection plumbing), both steam source and cooker must be given a thorough check-out before being put into operation. Checkout procedures for the cooker mounted on steam boilers of electric, gas and steam coil utility or direct connected steam are given in separate 2-1 S-2196 2-2 COOKER 5. Observe cooker operation for several minutes. Operation is correct if timer dials begin to rotate after a short delay period required for preheating. After the delay period plus the "4-minute" initial setting, the timer dials will return to the "0minute" position at which a buzzer sounds. The buzzer is silenced by turning the dial to the OFF position. 6. Open cooking compartment doors and repeat Steps 1 through 5 for the 60 MINUTE TIMER (down) position of selector switch (1). 2.4.3 Shut-Down Procedure No shut-down procedure is required for the S-2196 PRESSURELESS STEAM Pressureless Cooker except to check that all timer dials (3, 4) are in the OFF position and the compartment doors are open. Consult the steam boiler instruction plate and complete the shut-down procedures for the boiler. NOTE Before final check-off of the Cooker/Boiler system for use in cooking, boiler start-up and shut-down must be completed two more times to insure cleanliness and proper operation. SECTION 3 OPERATION 3.1 OPERATING CONTROLS AND INDICATORS The controls and indicators required to operate the Pressureless Steam Cooker are listed in Table 3-1, together with a short functional description of each. Figure 3-1 shows the physical location of each control and indicator. 3.2 OPERATING PROCEDURES The 3500 and 3550 are pressureless steam cookers which defrost frozen foods and cook fresh and defrosted foods. Each cooking compartment permits selection of either short duration (0-15 minutes) timing or long duration (0-60 minutes) cooking periods. Instructions for operation are included in this section. Consult Test Kitchen Bulletin #59 for detailed cooking information. 3.2.1. Steam Source Operation The Pressureless Cooker is supplied mounted on a cabinet containing either a steam boiler or controls for direct connected steam. Manual controls are accessed by opening the cabinet door. The start-up procedure for the steam source is completed once before each daily operating period of the cooker. (For steam boilers see instruction plate.) 3.2.2 Preheating Before each initial operation of the cooker, and at any other time when the cooking compartment is cold, a 1-minute preheating period is required. To preheat the cooker put steam source into operation and proceed as follows: 1. Close cooking compartment door and latch securely by pushing down on latch handle (1). 2. Place selector switch (2) for compartment(s) to be used in 15-MINUTE TIMER (up) position. 3. Set 15-Minute Timer Dial (3) to "1-minute" setting. 3-1 NOTE Total elapsed preheating time equals the timer setting plus a short delay period needed to activate a thermostatic switch included in the controls. 4. Turn off buzzer which sounds to indicate cooking is complete by setting the 15-Minute Timer Dial (3) to OFF position. 3.2.3 Cooking Before loading the cooker, be sure compartment is hot. See 3.2.2 for preheating instructions. 1. Slide pans of food into cooking compartment pan supports. 2. Close cooking compartment door and push down on latch handle (1) to engage. 3. Place Selector Switch (2) in required position: a. 15-MINUTE TIMER—For short duration timing. b. 60-MINUTE TIMER— For long cooking periods. 4. Set appropriate timer to the required cooking time (see Test Kitchen Bulletin #59). 5. Turn off buzzer which sounds to indicate cooking is complete by setting timer dial (3 or 4) to the OFF position. 6. Open door by lifting up on latch handle (1). 7. Unload by sliding pans of food from pan supports, taking care to avoid hitting compartment opening. 3.2.4 Shut-Down Procedure No shut-down procedure is required for the cooker except to check that both timer dials (3, 4) are in the OFF position, and that both compartment doors are open. When all cooking has been completed for the day the steam source must be shut off. (For steam boilers see instruction plate.) S-2196 3-2 PRESSURELESS STEAM COOKER Figure 3-1. Controls & Indicators 3.3 CLEANING After each period of daily operation (more frequently as required to maintain cleanliness) the cooker should be thoroughly cleaned by completing the following steps: 1. Remove left and right side pan supports (Figure 3-2) by lifting up and off mounting studs. Wash with detergent using a brush to clean drain screen. i-2196 Rinse and set aside for reassembly. 2. Wash cooking compartment interior using detergent and water. Rinse and dry thoroughly. 3. Replace pan supports in compartment and Leave door open. NOTE Supports with drain screens must be installed on left side of each compartment. OPERATION TABLE 3-1 CONTROLS AND INDICATORS (See Figure 3-1) Fig. 3-1 Ref. Description Function 1 Latch Handle Secures cooker door in closed position. Lift to open. 2 Selector Switch 15-MINUTE TIMER/60MINUTE TIMER The cooking interval selector switch. Placed in up position for 15-minute maximum timed interval; down position for 60-minute maximum timed period. 3 15-Minute Timer Controls short interval precision timed cooking from 0 to 15 minutes. 4 60-Minute Timer Controls longer duration cooking times from 0 to 60 minutes. 5 Indicator Light (red) 15-Minute Timer Indicates when lit that cooker is in operation controlled by 15-minute tim er. 6 Indicator Light (red) 60-Minute Timer Indicates when lit that cooker is in operation controlled by 60-minute timer. 7 Buzzer Signals end of cooking Period (not shown). Figure 3-2. Pan Support Removal SECTION 4 PRINCIPLES OF OPERATION 4.1 GENERAL 4.2.1 Steam Inlet Line The 3500 Pressureless Steam Cooker consists of two identical cooking compartments, one above the other, in a single cabinet assembly. (Model 3550 has only one compartment.) Each compartment is fitted with independent electrically controlled steam circuits and spring loaded, self-sealing doors with cam-action latches. Compartments can be used separately (or simultaneously for model 3500) for either of two timed intervals— 15-minute maximum timing' or long duration 60-minute maximum timing. The principles of operation in this section include an explanation of steam, steam condensing and electrical circuits and their functioning for the Model 3500. Operation is identical for the single compartment 3550. A steam supply line is plumbed from the boiler output (or direct connected steam control), to a 1/2 inch "T" fitting connected to the input sides of both steam inlet solenoid valves. At all times when a cooking compartment is not in use the valve for the compartment remains closed to prevent steam from entering. During operation the appropriate inlet solenoid valve is opened by activation of the control circuit. Steam is projected onto the surface of pans of food loaded into the compartment by a jet pipe located inside the compartment. Steam continues to flow through the compartment in this manner until the control circuit closes the solenoid valve. 4.2 PLUMBING CIRCUITS 4.2.2 Steam Exhaust and Drain Lines The plumbing circuits consist of the piping, steam solenoid valves, steam jet pipe, drain, cold water condenser, and pressure safety relief valve required to provide controlled steam application to the cooking compartments. A simplified diagram of these circuits for model 3500 is shown in Figure 4-1. Steam exhaust and compartment drainage are removed from the cooking compartments by a separate line from each, connecting with the boiler (or direct connected steam plumbing) drain system. Perforated strainers at the drain line openings inside each compartment allow only steam, condensation and liquid cooking drainage to enter. Prior to discharge into the boiler drain system, steam is converted to water by the cold water condensing systems for each compartment. NOTE Figure 4-1 is strictly a pictorial schematic diagram and is not intended to show the actual configuration of the plumbing. All components are shown in correct relationship with each other. However, the diagram does not show their actual locations or position within the cooker. As shown in the diagram, steam inlet and exhaust connections are connected at the factory directly into a steam boiler or direct connected steam plumbing enclosed within a base cabinet on which the cooker is mounted. The boiler (or direct connected steam control system) is equipped to supply constant, regulated steam at 14-15 PSI. Steam exhaust, having been reduced to water by the cold water condenser, is directed into the boiler (or direct connected steam control) drain system. Steam inlet lines for compartments are equipped with normally closed solenoid valves operated by the electrical control circuits. The inlet valves are opened whenever the compartment control circuit is activated by use of either the 15-minute or 60-minute timers. 4-1 4.2.3 Steam Exhaust Condensing System The steam condensing system consists of the identical, two-position, normally closed cold water solenoid valves (one only in the model 3550) with outlet sides connected into the exhaust plumbing for each cooking compartment. A spray nozzle directs cold water about the inside of the drain lines to increase cold water contact with exhausted steam. Valve inlet sides are connected to the cold water supply line of the steam boiler (or direct connected steam plumbing). The valves function simultaneously (even though only one compartment may be in use) and independently of other cooker controls, in response to a thermostatic switch located at the discharge opening of the boiler drain line. The switch allows the valves to open at all times when the drain temperature exceeds 193°F. S-2196 4-2 P RE SSURELESS STEAM COOKER Figure 4-1. Pictorial Diagram. Steam & Water Circuits — Model 3500 4.2.4 Pressure Safety Valve A coupling mounted on the side of each compartment is fitted with a pressure relief valve. The valves provide pressure overload protection for each compartment in the unlikely event of a drain blockage. Relief valves are of the spring loaded, poppet type, pre-set to open automatically at pressures in excess of 0.5 PSI. S-2196 4.3 ELECTRICAL CIRCUITS The electrical circuits of the cooker control the power to activate timer motors and energize solenoid operated valves and circuits which in turn control cooking application of steam to the cooking compartment and condensation of steam from the exhaust line. The cooker operates on 120V, 2 amp, 60Hz (50 Hz on special order) electrical service connected to all PRINCIPLES OF OPERATION circuits from the circuits of the steam boiler (or direct connected steam controls) contained within the cabinet on which the cooker is mounted. Power is supplied to the control circuit at all times when the shut-off device for the unit (supplied by the user) is in the ON position. 4.3.1 Control Circuit Components The control circuit is shown in pictorial diagram Figure 4-2. The diagram shows only one compartment as in the model 3550, or one of the two identical compartments of the 3500. A brief description of the electrical circuit elements follows. 4.3.1.1 Selector Switch The selector switch is a triple-pole, double throw switch. One set of contacts applies 120 volt input to the common element (1) of either the 15-minute or 60-minute timers. The second set of contacts closes the circuit from the door interlock switch to the indicator light for either the 15-minute of 60-minute timer. The third set of contacts closes the circuit between circuit interrupters (door interlock switch and thermostatic time delay switch) and the timer motor for either the 15-minute or 60-minute timers. Figure 4-2. Pictorial Diagram. Electrical Circuits, One Compartment & Condenser 4.3.1.2 15-Minute Timer The timer contains a 120 volt ac synchronous motor which drives a timing dial through a gear reduction and clutch mechanism. The timer dial is manually set for any interval of operation from 0-to 15-minutes as read on the calibrated dial face. The manual rotation of the dial moves the common element (1) of the timer switch from the neutral (OFF) position to contact (3) which connects with the steam inlet solenoid valve operating circuit. The cooker is placed into automatic operation with the setting of the timer dial. Its timing cycle, however, is automatically delayed by a thermostatic switch which assures operating temperature is achieved before the timer motor begins to "time out". When the timer motor has operated for the preset duration, the common element is transferred to contact (4), returning the inlet solenoid valve to the closed position and energizing the buzzer. Contact to the buzzer circuit remains closed until the dial is manually turned to the OFF position, returning the common element (1) of the timer switch to the neutral position. 4.3.1.3 60-Minute Timer The timer operates in the same manner as the 15Minute Timer but with a maximum time setting of up to 60 minutes. 4.3.1.4 Indicator Lights A separate indicator light is included for the 15Minute Timer and the 60-Minute Timer. The light remains on (red) at all times when the coinciding timer dial is set and the door interlock switch is closed. It turns off at the end of the timed cooking duration. 4.3.1.5 Buzzer The buzzer is an alarm device which operates by oscillation of a striker against the core of an electromagnet. When either the 15-Minute or 60Minute Timer dials reach "0-Minutes"the buzzer coil is energized to sound the buzzer. Movement of the timer dial to the OFF position opens the contact to the buzzer coil to shut it off. S-2196 4-4 4.3.1.6 Door Interlock Switch The interlock switch is a single pole, two-position, microswitch with normally open contacts. The switch lever is operated by contact with the door. When the door is open the switch contacts remain in the open position. When the door is closed and securely latched in place, the switch lever is depressed to close the contacts. Connected between the operating contact (3) of the timers and the steam inlet solenoid valve, the door switch acts as a protective device to interrupt valve operation unless the door is closed. 4.3.1.7 Thermostatic Time Delay Switch The thermostatically operated time delay is a twoposition, normally open switch mounted on the S-2196 PRESSURELESS STEAM COOKER cooking compartment. The switch functions to delay timer motor operation until the compartment temperature reaches 193°F., thus assuring that cooking temperature exists throughout the timed duration. 4.3.1.8 Thermostatic Steam Condenser Switch The switch is included in the boiler drain line system (or direct connected steam controls) where it monitors the temperature of discharge from the drain line. The switch is normally open, closing whenever the temperature reaches 193°F. Operating independently of other control components it is the sole control device for the cold water solenoid valves of the steam condensing system. SECTION 5 TROUBLE-SHOOTING 5.1 GENERAL 5.2 TROUBLE-SHOOTING GUIDES The information in this section is intended to assist both the operator and service personnel in locating the general source of problems which may occur with the cooker. Before following any of the procedures given in this section, the operator should be thoroughly familiar with the operating instructions and the function of all controls which are described in Section 3. If the problem cannot be readily corrected, the operator should contact the nearest Market Forge service agency for assistance. A trouble-shooting guide for use by service personnel is given in Table 5-1. 5.3 ELECTRICAL FAULT ISOLATION Correction of an electrical failure first requires isolation of the fault to a single circuit or component. In most cases the nature of the failure and its effect upon the operation of the cooker will be sufficient to isolate it to one or more circuit elements. Table 5-2 is provided as a guide for isolating electrical faults. TABLE 5-1 GENERAL TROUBLE-SHOOTING GUIDE PROBLEM Probable Cause 1. a. Remedy 15 MINUTE INDICATOR LIGHT FAILS TO LIGHT WITH SELECTOR SWITCH IN 15 MINUTE TIMER POSITION AND 15 MINUTE TIMER SET. Power to Cooker off. Locate external circuit breaker for incoming power and place in ON position. b. Door interlock switch contacts not closed. Shut cooker door to close switch contacts. Check alignment of door with switch button. c. d. e. f. Door interlock switch faulty. Indicator light burned out. Faulty timer contacts. Faulty selector switch. Replace switch. See subsection 5.4.6 Replace light. Replace timer. See subsection 5.4.4 and 5.4.5. Replace switch. See subsection 5.4.3 g. Faulty wiring. Inspect condition of wire and tightness of all connections. Correct as needed. 2. 60 MINUTE INDICATOR LIGHT FAILS TO LIGHT WITH SELECTOR SWITCH IN 60 MINUTE TIMER POSITION AND 60 MINUTE TIMER SET. See item 1a. through g. 5-1 S-2196 5-2 PRESSURELESS STEAM COOKER TABLE 5-1 (cont.) PROBLEM Remedy Probable Cause 3. STEAM FAILS TO ENTER COOKING COMPAFTMENT WITH INDICATOR LIGHT ON. a. Faulty steam solenoid valve. Replace valve. See subsection 5.4.7. b. Faulty wiring. Inspect condition of wire and tightness of all connections. Correct as needed. 4. STEAM ENTERS COMPARTMENT CONTINUOUSLY. TIMER DIAL NOT TURNING. a. Faulty thermostatic switch. Replace switch. See subsection 5.4.9 b. Faulty timer motor. Replace timer. See subsection 5.4.4 and 5.4.5. c. Faulty steam solenoid valve. d. Faulty selector switch. e. Faulty wiring. Replace valve. See subsection 5.4.7 Replace switch. See subsection 5.4.3 Inspect condition of wire and tightness of all connections. Correct as needed. 5. STEAM CONTINUES TO FLOW INTO COMPARTMENT AND/OR BUZZER FAILS TO SOUND AT END OF TIMER SETTING. a. Timer contacts faulty. Replace timer. See subsection 5.4.4 and 5.4.5. b. Buzzer faulty. c. Faulty wiring. Replace buzzer. See subsection 5.4.1 Inspect condition of wire and tightness of all connections. Correct as needed. 6. STEAM FLOWS CONTINUOUSLY FROM BOILER (OR DIRECT CONNECTED STEAM CONTROL) DRAIN LINE WITH COOKER IN OPERATION. a. Cold water not connected. Turn on external shut off valve. b. Faulty condenser thermostat. Replace thermostat. See subsection 5.4.11. c. Faulty cold water solenoid d. Faulty wiring. Replace valve. Inspect condition of wire and tightness of all connections. Correct as needed. 5.4 ELECTRICAL TROUBLE-SHOOTING PROCEDURES Before performing the trouble-shooting procedures in this section the serviceman must be familiar with the function of all controls as described in Section 3 and with the Principles of Operation described in Section 4. Electrical trouble-shooting procedures which follow require access to components and terminals of S-2196 the electrical control panel shown in Figure 7-4. Electrical controls are reached by removing screws (Figure 7-4, 1) which fasten the control panel (Figure 7-4,2,3) to the frame. The panel may be pulled forward for testing while interconnected to the cooker circuits or disconnected at the 12 pin connection (17) for complete removal and repair. Wiring and terminal locations are shown in Figure 5-1. TROUBLE SHOOTING , 5-3 TABLE 5-2 ELECTRICAL FAULT ISOLATION GUIDE 1. 2. 3. 4. 5. 6. 7. 8. FAILURE FAULT LOCATION Will not operate in either 15MINUTE or 60-MINUTE TIMER positions. a. Incoming power b. c. d. Selector switch Door Interlock switch Wiring Operating in 15-MINUTE TIMER position but not in 60-MINUTE TIMER position. a. Selector switch b. d. 60-Minute Timer Wiring Operates in 60-MINUTE TIMER position but not in 15-MINUTE TIMER position. a. Selector switch b. c. 15-Minute Timer Wiring Steam solenoid valve fails to open with indicator light on. a. Solenoid valve coil b. Wiring Indicator light off with steam solenoid valve open. a. Indicator light b. c. Selector switch Wiring With indicator light on and steam solenoid valve open, timer dial fails to turn. a. Compartment thermostatic switch b. c. d. Selector switch Timer motor Wiring Buzzer fails to sound at end of either 15-Minute or 60-Minute Timer modes a. 15-or 60- minute timer contacts b. c. Buzzer Wiring Steam flows continuously from boiler drain line. a. Condenser thermostatic switch b. c. Cold water solenoid valve Wiring 5.4.1 Incoming Power Before trouble-shooting any of the electrical parts or assemblies, verify that power is being supplied to the cooker. Incoming power is connected at the boiler (or direct connected steam) control box located in the base cabinet. With power connected to the cooker an a-c volt-meter is used to measure 120 volts across L1 and L2. If 120 volts is present, and the cooker will not operate, the fault lies within the electrical circuits of the cooker. 5.4.2 Electrical Inspection The first step in any electrical trouble-shooting procedure is a thorough physical inspection of all wiring connections. To access electrical components remove the control panel as explained in subsection 6.3.2. WARNING Before removing control panel or checking connections and wiring be sure that the circuit breaker for incoming power is OFF. When power is supplied all exposed terminals of the control panel carry 120 volts. Check all wiring connections by hand to assure that both ends of all connection points are tightly secured. Use a screwdriver to tighten connection points. If necessary visually inspect all quick-disconnect terminals for evidence of corrosion. Terminals in this condition should be separated, cleaned with emery cloth until shiny and tightly reconnected. S-2196 5-4 PRESSURELESS STEAM COOKER Figure 5-1. Wiring Diagram, Model 3500 5.4.3 Selector Switch A defective Selector Switch may be the cause of failure of either cooker compartment to operate in both 15 MINUTE TIMER and 60 MINUTE TIMER positions, or failure to operate in one position only. To check the Selector Switch, proceed as follows: 1. Turn off power to the cooker at external circuit breaker. 2. Disconnect all wires from Selector Switch terminals (Figure 5-1). 3. Connect an ohmmeter between one of the common terminals (2, 5, 8) and either of the S-2196 outside terminals for that pole of the switch (e.g. common terminal 2 and terminal 1). 4. Operate switch to close contacts to terminals being tested. If a zero ohm reading cannot be obtained, switch is defective and must be replaced. 5. Move ohmmeter lead from outside terminal to opposite outside terminal for that pole, (e.g. common terminal 2 and terminal 3), and repeat step 4. 6. Remove ohmmeter and replace all leads on Selector Switch as shown in Figure 5-1. TROUBLE SHOOTING 5.4.4 15-MINUTE Timer 5.4.4.1 Timer Contacts Defective timer contacts will result in failure of either cooker compartment to operate for the 15 MINUTE TIMER duration. If either compartment fails to operate in the 15 MINUTE TIMER mode, but functions correctly in the 60 MINUTE TIMER mode, the fault is with the 15 Minute Timer contacts or its wiring. When this occurs, remove the control panel (subsection 6.3.2), and proceed as follows: 1. Turn off power to the cooker at external circuit breaker. 2. Disconnect all five wires from timer terminals (see Figure 5-1). 3. Connect an ohmmeter between terminal 1 and 3. 4. Rotate timer dial beyond the "0-minute" point (any setting) to obtain a reading of zero ohms on the ohmmeter. If zero ohm reading cannot be obtained, timer contacts are defective and the timer must be replaced. 5. Move ohmmeter leads to terminals 1 and 4. 6. Rotate timer dial to 0-MINUTE position. (An audible click indicates correct position). If zero ohm reading cannot be obtained, the timer is defective and must be replaced. 7. Remove ohmmeter and replace all five leads on timer terminals as shown in Figure 5-1. 5.4.4.2 Timer Motor A defective timer motor will cause continuous operation in the 15-MINUTE TIMER mode with the timer dial failing to return to the "0-Minute" position. Since thermostatic switch failure can cause the same symptom, fault must first be isolated to the timer by attempting operation of the compartment in the 60Minute Timer mode. If the cooker operates correctly using the 60-Minute timer, then the 15-Minute timer motor is faulty. If both timer dials fail to turn, then the cause of malfunction is probably not the 15-Minute Timer motor. To confirm timer motor condition, proceed as follows: 1. Carefully check motor wire leads and tighten loose connections. WARNING Use care while working with control panel. Terminals carry 120 volts. 2. Turn on power to the cooker. 3. With Selector Switch in the 15 MINUTE TIMER position, set timer dial (any setting beyond "0Minute"). If operation is correct the motor will turn the dial toward "0-Minute". If 5-5 the motor fails to operate, it is defective and the entire timer must be replaced. 4. Shut off power to the cooker. 5.4.5 60-MINUTE Timer Test the 60-Minute Timer contacts and motor in the same manner as for the 15-Minute Timer. See 5.4.4. 5.4.6 Door Interlock Switch Malfunction of the cooker door interlock switch prevents timer indicator lights from turning on and steam solenoid from opening when the timer dial is set. If steam does not enter the compartment and the indicator light fails to turn on with the door latch securely engaged, the fault may be in the door interlock switch. Proceed as follows: 1. Turn off power to the cooker. 2. Disconnect wires to the door switch terminals (see Figure 5-1). 3. Connect an ohmmeter between the terminals of the switch. 4. Actuate the switch by closing the cooking compartment door. If a zero reading cannot be obtained, the switch is defective and must be replaced. 5. Remove the ohmmeter and replace the leads on switch terminals. (See Figure 5-1). 5.4.7 Steam Solenoid Valves When either inlet solenoid valve fails to operate, the fault may be a defective coil. A defective coil is found using an a-c volt meter to check the voltage at the coil wire terminals, with the cooker compartment operating in either 15 MINUTE TIMER or 60 MINUTE TIMER modes. If voltage of 120 volts is present and the coil fails to close the valves, the fault is in the valve coil. Defective valve coils are not separately replaceable, requiring complete valve replacement. 5.4.8 Indicator Lights If the cooker compartment functions correctly with the single exception that the indicator light fails to light during operation, the fault is a defective indicator light. A "burned-out" or defective light is verified by using an a-c volt meter at the leads, with input power on the selector switch in the correct position for that timer, the timer set and the door latches closed. If 120 volts is present the fault is in the indicator light and requires replacement. If 120 volts is not present, the fault is in the wiring or control components (selector switch, timer, door switch). S-2196 5-6 PRESSURELESS STEAM COOKER 5.4.9 Cooking Compartment Thermostatic Switch 2. Remove wires 3 and 52 from the thermostat switch terminals. A thermostatic switch included in the circuit for the timer motor delays timer operation until steam flowing into the compartment satisfies the temperature actuated switch device. If a timer motor fails to operate within about 1 minute after the indicator light comes on (with cooker compartment empty)the cause may be a defective thermostatic switch. To test the switch proceed as follows: 3. Connect an ohmmeter between the two terminals of the switch. 1. Disconnect the two wires connected to the thermostatic switch terminals. 2. Connect an ohmmeter between the two terminals of the switch. 3. Place the cooker into operation and observe ohmmeter dial. Within 1 minute of operation, the switch contacts close automatically to register a zero ohm reading on the dial. If a zero ohm reading is not obtained the switch is defective. 4. Place the cooker into operation and observe the ohmmeter dial. Shortly after steam is observed exiting the drain line, the thermostat contacts should close as evidenced by a zero ohm reading on the dial. If a zero ohm reading is not obtained the switch is defective. 5. Shut off cooker, disconnect ohmmeter leads, and replace wires 3 and 52. If the condenser thermostat functions correctly but either of the cold water solenoid valves fail to operate, the cause might be a faulty valve coil. A defective coil is found using an a-c volt meter to check the voltage at the coil wire terminals with the cooker compartment in operation. If voltage of 120 volts is present and the valve fails to open, the fault is in the valve coil. Defective valve coils are separately replaceable. 4. Shut off cooker, disconnect ohmmeter leads and replace wires on switch terminals. 5.4.12 Wiring 5.4.10 Buzzer If the buzzer does not sound at the termination of the operator selected timer setting (timer dial returned to "0-Minute" position), the fault may be a defective buzzer. Buzzer operation is verified using an a-c volt meter at buzzer coil connections with input power on, selector switch and coinciding timer dial set at the "0-Minute" position. If voltage is 120 volts, the fault is in the buzzer which must be replaced. If 120 volts is not present, the fault is in the wiring or control components, (timer, selector switch). 5.4.11 Cold Water Condenser Circuit If during cooker operation steam exits from the drain line opening (located in lower boiler compartment) and the condensing system fails to operate, as evidenced by repeated discharge of water from the drain line, the condensing circuit is malfunctioning. The failure can be caused by a defective condenser thermostat, cold water solenoid coil or wiring failure. To test the condenser thermostat proceed as follows: 1. Remove the cover from the control box located inside the boiler compartment. S-2196 All of the electrical components of the Cooker (selector switch, timers, indicator lights, switches, etc.) are connected to each other by wiring shown in Figure 5-1. If all of the electrical components are operating correctly (and the incoming power has been checked), but the cooker fails to operate the fault lies in the wiring. Figure 5-1 is a diagram which shows all terminals and interconnections within the electrical circuits. All numbered terminals are identified and all leads number coded as shown. Connections can be easily removed. Figure 5-2 shows the same information schematically and is an aid in isolating circuits for testing. Using an ohmmeter wiring continuity between the connections shown on the wiring diagram (Figure 51) are readily verified. This is best done in stages, removing only those wires required for each continuity check. As each lead is replaced it should be checked for evidence of corrosion and cleaned if necessary. All leads must be tightly attached so as to provide a good electrical connection. TROUBLE SHOOTING . Figure 5-2. Schematic Diagram. Model 3500 S-2196 5-7 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 cooker is installed. It is recommended that user personnel never attempt to make repairs or replacements to the equipment without the assistance of authorized service. Assistance in service methods or a current Directory of Authorized Agencies may be obtained from Market Forge. (See paragraph 1.3 in Section 1). 6.2 PREVENTIVE MAINTENANCE A good preventive maintenance program begins with the daily cleaning procedure described in paragraph 3.3 in Section 3. Additional preventive maintenance operations are presented in this section. In establishments w hich employ full-time maintenance personnel, the tasks described can be assigned to them. For other installations, tasks requiring mechanical or electrical experience should be performed by an authorized service agency. The following paragraphs set forth m inimum preventive maintenance procedures which must be completed periodically to assure continued trouble-free operation of the cooker. are then ready for reassembly. The inner door must be properly aligned above the mounting pins of the outer door with the bend of the "U" spring toward the hinge. By pressing inner and outer doors together while sliding the inner door left and right, the inner door will drop into position with ease. 6.2.2 Door Latch Lubrication The door latch assembly is shown in Figure 7-2, item 9. Monthly application of lubricant ensures ease of operation and protects against wear of moving parts. Both inner doors must be removed from the compartments as described in paragraph 6.2.1. "NeverSeez" lubricant, part number 10-0782, is applied to the strike pin and latch spring plate where the cam arm rubs against it in operation. No other latch parts require lubrication. The inner doors are remounted as described in paragraph 6.2.1. 6.2.3 Cooking Compartment Cleaning A daily cleaning of the cooking compartments and pan supports is required. See subsection 3.3 for details. CAUTION Under no circumstances should hardware (or parts) be replaced with a different length, size or type other than as specified in the parts list. The hardware used in the Cooker has been selected or designed specifically for its application and the use of other hardware may damage the equipment and will void any warranty. 6.2 1 Door Disassembly and Cleaning The inner doors must be removed from the outer doors of each cooking compartment for weekly cleaning. With the door open, the inner door is grasped firmly on the right side and pushed upward until it is disengaged from the outer door pins. (See Figure 6-1). Both inner door and inside surface of the outer door should be thoroughly cleaned with mild detergent-water solution, rinsed and dried. The doors Figure 6-1. Inner Door Removal 6-1 S-2196 6-2 PRESSURELESS STEAM COOKER 6.3 REPAIR AND REPLACEMENT Section 7 of this manual contains a listing of all replaceable parts and associated exploded views of the 3500 and 3550 cookers. In most cases disassembly procedures for both 3500 and 3550 will be obvious from the exploded views. Instructions follow for procedures which are not readily apparent. 6.3.1 Door Assembly The door assembly consists of the door with latch mechanism, Figure 7-2 and the latch strike with spring, Figure 7-1, (11 and 12). 6.3.1.1 Gasket Replacement. The door gaskets Figure 7-2, (8) are readily replaced by first removing the inner door assemblies from the outer doors, and gently prying the gaskets from around the perimeters of each door. No fasteners are used. The replacement gasket is stretched over the door and pressed into the channel provided for it. Adjustment of door tension against the face of the compartment is normally not required, since the door springs provide continuous pressure of the gasket against the compartment whenever the door is latched closed. If steam escapes from around the door after gasket replacement, and the door springs are sound, see subsection 6.4.1. 6.3.1.2 Door Latch Replacement. The entire latch assembly (Figure 7-2,9) may be replaced by removal of hardware items 14,15,16,17 and 18. Individual parts of the assembly are separately replaceable to the extent shown in Figure 7-2 6.3.2 Exterior Panel Removal WARNING To prevent hazard in servicing the cooker be certain that the steam supply boiler is shutdown, the cold water shut-off valve is closed, and the electrical disconnect circuit breaker for the cooker/boiler unit is off before removing side panels. Access to all internal plumbing and electrical assemblies is from the left side and left front. The left side panel is removed by pushing up on the panel until the lower lip disengages the frame. The panel is shown as item 2, Figure 7-1. The electric control panel, shown in Figure 7-4, may also be removed as a unit by removing screws (1) and pulling the panel forward as shown in Figure 6-2. Removal of the control panel is completed by unplugging interconnecting wiring at pin housing (17). S-2196 Figure 6-2. Control Panel Removal Repairs of the cold water condensing system may also require removal of the left side panel of the boiler compartment. The panel is pulled out sharply at the bottom until it is removed from the clips which secure it. The 3500 Cooker on a gas boiler is shown with panels removed in Figure 6-3. Major components and interconnections are labeled for reference. Interconnections are identical for electric and steam coil boilers, and direct connected steam mountings. 6.3.3 Steam and Water Solenoid Valve Replacement Replacements for the 1/2-inch steam solenoid valves and the 1/4-inch water valves are available from Market Forge Authorized Service Agencies as complete units. It is necessary to replace an entire steam valve when the coil is faulty or the diaphram ruptures. Replacement coils are available for the water valves. The valves are accessed as explained in paragraph 6.3.2. MAINTENANCE 6-3 strike but does not engage it, or the pin engages but placement of the handle in the locked (down) position fails to seal the door, the problem can be corrected by adjusting the position of the latch assembly. To adjust the latch assembly, the truss head screws are loosened, the latch assembly slid in or out of the door as required, and the screws retightened. Proceed by trial and error until correct operation is achieved. 6.4.2 Door Tension Adjustment If steam leaks from around the door the difficulty may be caused by insufficient spring tension against the inner door. Other possible causes of this symptom should first be eliminated, i.e. damaged or worn door gasket, or, improper latch adjustment (6.4.1.2). If other corrective measures fail to eliminate steam leaks, the difficulty can be corrected by shimming the two door springs to increase inner door tension against the compartment. Shims (Figure 7-2, 21) are bolted in place between the inner door and the springs as shown in Figure 7-2. The shims are optional adjusting parts which are used only as required. Figure 6-3. Plumbing and Interior View 6.4 DOOR ADJUSTMENT Provision for door adjustment has been made to assure proper alignment of operating parts. The procedures in this section describe adjustments which can be made if the door fails to function properly. Before making adjustments be sure all parts are in good repair. The door assembly is shown in Figure 7-2. 6.4.1 Latch Adjustment Two adjustments of the latch mechanism are possible if needed. Reference Figure 6-4. 6.4.1.1 Latch Arm Drag. The latch handle should remain at any position of its operating arc with the door open. If the handle drops when released, tension can be increased against the cam arm by loosening the jam nut and tightening the screw until the handle remains fixed in any position unless moved by hand. The jam nut fixes the adjustment. 6.4.1.2 Latch Engagement. When the top edge of the latch arm is at roughly an 80° angle to the face of the door, the latch strike pin should automatically engage the strike in the "hold" position. If the strike pin hits the Figure 6-4. Latch Adjustment S-2196 SECTION 7 ILLUSTRATED PARTS LIST 7.1 GENERAL This section contains a complete listing of all replaceable parts of the 3500 and 3550 Cookers. For the purpose of parts identification, the unit is broken down into functional assemblies, and each assembly is shown in an exploded view which is keyed to the accompanying parts list. Each parts list contains the figure index number, the Market Forge part number and an abbreviated description. Product Service Department Market Forge Canada, Ltd. 1375 Aimco Blvd., Unit 5 Mississauga, Ontario, Canada L4W 1B5 Telephone: (416) 621-9252 All orders should contain the Market Forge part number(s), the part description(s), and the model and serial numbers of the cooker for which the part(s) is ordered. 7.2 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: Product Service Department Market Forge 35 Garvey Street Everett, Massachusetts 02149 Telephone: (617) 387-4100 7-1 7.3 INDEX OF ILLUSTRATED PARTS LIST Figure 7-1 7-2 7-3 7-4 Cabinet Assembly Door Assembly Plumbing Assembly Control Panel S-2196 Page 7-2 7-4 7-6 7-8 Figure 7-1 Cabinet Assembly ILLUSTRATED PARTS LIST FIG. 7-1 INDEX NO. 7-3 PART NUMBER DESCRIPTION 1A 91-3228 Front Frame & Liner Assembly, model 3500 1B 91-3570 Front Frame & Liner Assembly, model 3550 2A 91-3229 Side Panel, model 3500 2B 91-3565 Side Panel, model 3550 3 10-3222 Hinge Rod, top, door, model 3500 & 3550 4 10-8052 Bearing, "Ny-Liner" 5 10-2402 Washer, 3/8" 6 10-1664 Cotter Pin, door hinge 7 91-3223 Collar, hinge rod 8 91-3224 Hinge Rod, bottom door, model 3500 9 91-3237 Rack Support, left w/screen 10 91-3206 Rack Support, right 11 91-3259 Strike, latch 12 10-2755 Spring, latch 13 10-2175 Screw, rnd hd, machine, #8—32 x 2" 14 10-2408 Washer, #8 15 10-2330 Nut, #8—32 16 10-2020 Screw, #10—32 X1/2" 17 10-2426 Washer, #10 PRESSURELESS STEAM COOKER Figure 7-2. Door Assembly ILLUSTRATED PARTS LIST Next Page 7-4 A Figure 7-2A — 3550-CTE Door Assembly. FIG. 7-2A ITEM NO. PART NO. 1 91-5117 Outer Door 2 3 4 5 6 7 8 9 10 11 12 13 14 91-5124 09-4205 91-5104 10-0100 10-2550 10-1761 91-4575 91-4588 10-2318 10-1788 10-0050 10-8931 91-4597 Inner Door Gasket Gasket Retaining Plate Washer, 1/ 2 OD, nylon Nut, acorn, #8-32, st. st. Screw, truss hd., #8-32 x 3/8" Latch Assembly Spring Plate Nut, acorn, #10-32 Screw, truss hd., #10-32 x 3/8" Handle Screw, Flat hd., 1/4-20 x 3/4" Door Assembly, complete DESCRIPTION S-2196 11/81 ILLUSTRATED PARTS LIST 7-5 FIG. 7—2 INDEX NO. 1 2 PART NUMBER 91-3215 10-8052 3 91-3263 Spring 4 10-2330 Nut, #8—32 5 10-2518 Lock Washer, #8 6 10-1719 Screw, rnd hd, #8—32 7 91-3214 Gasket Plate 8 10-8933 Gasket, neoprene DESCRIPTION Outer Door Bearing, "Ny-Liner" 9 91-3258 Latch Assembly, complete 10 91-3256 Handle 11 10-8931 Screw, flt hd, 1/4 —20 x 3/4" w/nylon insert 12 10-1762 Screw, rnd hd, #10—32 x 5/8" 13 10-2339 Nut, #10—32 14 10-1744 Screw, truss hd, 1/4 —20 x 5/8" Ig 15 10-2403 Washer, 1/4", s/s 16 10-2520 Lock Washer, ext. tooth, 1/4" 17 10-2508 Lock Washer, 1/4", s/s 18 10-2336 Nut, 1 /4—20, s/s 19 91-3250 Strike Pin 20 10-2514 Washer, int. tooth, #10 21 91-3279 Shim, door spring S-2196 PRESSURELESS STEAM COOKER Figure 7-3. Plumbing Assembly ILLUSTRATED PARTS LIST 7-7 FIG. 7-3 INDEX NO. PART NUMBER 1 91-3240 Jet Pipe 2 3 4 5 6A 6B 7 8 9 10 11 12 13A 13B 13C 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 91-3457 10-4586 10-8823 10-2810 10-5859 10-7340 10-2837 10-3670 10-8102 10-8105 10-8821 10-3357 10-1326 10-1329 10-0865 10-3615 10-1000 10-3387 10-8051 10-8815 10-8813 91-3245 10-4137 10-3628 10-8819 10-2867 91-3430 10-3343 10-8817 10-8818 10-8822 Spacer Plate Nut Elbow, union, 90°, 1/2 IPS Nipple, close, 1/2" Valve, solenoid, 1/2", steam, 120V, 60 Hz Valve, solenoid, 1/2", steam, 240V, 50 Hz Compression Fitting, 90°, Vz NPT x 5/8 OD Tee, 3/4" x 1/2" x 1/2", blk iron Valve, pressure relief Thermostat Tee, compression, 3/8" OD tube Elbow, compression, 1/4 NPT x 3/8 OD Valve, solenoid, 1/4", water, 120V, 60 Hz Coil, 120V, water solenoid Valve, solenoid, 1/4", water, 240V, 50 Hz Nipple, close, 1/4" IPS Bushing, outside, hex, 3/8 NPT x 1/4 IPS Elbow, 3/8 IPS x 45° Nozzle, condenser Bushing, outside, hex 1 1/4" x 3/8" Tee, VA IPS Nipple, hose Clamp, hose Straight compression fitting, V4 NPT x 3/8 OD Coupling reducer, 3/8" IPS x ¼” Compression Fitting, 90°, 1/2 NPT x 5/8 OD Channel, liner Nut Branch, "Y", 45°, 1 1/4 IPS (not shown) Nipple, close, 1 1/4 IPS, black iron (not shown) Bushing, hex, outside, 2" x 1 1/4" (not shown) DESCRIPTION NOTES: Items 27, 28 and 29 are provided for connection of the cooker drain lines to the boiler drain located in the boiler compartment. Model 3550 uses some parts for one compartment only. S-2196 Figure 7-4. Control Panel ILLUSTRATED PARTS LIST FIG. 7-4 INDEX NO. PART NO. 1 10-2146 Screw, #6—32 x 1/4" 2A 2B 3A 3B 4 5 6A 6B 7A 7B 8 8A 8B 9 9A 10A 10B 11 12 13 14 15A 15B 16 16A 16B 17 17A 17B 18 10-8955 10-8266 10-8277 10-8799 10-1979 10-6307 10-7927 10-9162 10-6291 10-6293 10-7365 — — 10-5016 — 91-3274 91-3462 10-6005 10-1722 10-2337 10-2428 10-6682 10-6665 10-6859 — — 10-9244 10-9265 10-2966 10-9276 Bezel, model 3500 Bezel, model 3550 Nameplate, control panel, model 3500 Nameplate, control panel, model 3550 Screw, flat hd. #4—40 Dial, timer Timer, 15-MINUTE, 115V, 60 Hz Timer, 15-MINUTE, 240V, 50/60 Hz Timer, 60-MINUTE, 115V, 60 Hz Timer, 60-MINUTE, 240V, 50/60 Hz Switch, toggle, 2 position, triple throw Nut, hex, switch, (part of #8) Nut, knurled, switch, (part of #8) Light, indicator, red Clip, light Bracket, terminal block and buzzer, model 3500 Bracket, terminal block and buzzer, model 3550 Terminal Block Screw, rnd hd, #6—32 x 3/8" Nut, #6—32 Washer, #6 Buzzer, 60 Hz Buzzer, 50 Hz Switch, micro Nut, hex, switch (part of #16) Nut, knurled, switch (part of #16) Pin Housing Pin Contact (not shown) Socket Contact (not shown) Boot, push button 7-9 DESCRIPTION NOTE: *Model 3550 uses same parts for one compartment only. S-2196