Service & Parts Manual

Transcript

SERVICE & PARTS MANUAL SUPPLEMENT Cook & Hold for Power Saver II Convection Ovens Models: 2400 HE 2492 HE Supplement to 17-0393, for Power Saver II Ovens equipped with Cook & Hold Controls. MARKET FORGE CANADA LTD. Mississauga, Ontario, Canada Form No. 17-0406 Printed in U.S.A. 35 Garvey St., Everett, MA. 02149 Tel. (617) 387-4100, Telex 94-9414, Cable MAFORCO TABLE OF CONTENTS Paragraph SECTION 1 INTRODUCTION 11 Description 12 Basic Functioning 13 Service SECTION 2 OPERATION 21 Operating Controls and Indicators 22 Operating Procedures 221 Preheating 222 Cook Mode Operation 223 Cook & Hold Operation SECTION 3 PRINCIPLES OF OPERATION 31 General 32 Theory of Operation 321 Power and Heating Element Operation 322 Cook Mode Controls 323 Cook & Hold Mode Operations 33 Electrical Circuits 331 Power Circuit Components 332 Control Circuit Components SECTION 4 TROUBLE-SHOOTING 41 General 42 Trouble-Shooting Guide 43 Electrical Fault Isolation 44 Electrical Trouble-Shooting Procedures Page Paragraph 441 442 443 444 Trouble-Shooting Sequence Incoming Power General Oven Test Transformer (440/480 volt service only) 445 Circuit Breaker 446 Power ON-OFF Switch 447 Door Switch 448 Operating Thermostat Control 449 Selector Switch 4410 60-Minute Timer and Buzzer 4411 Fan Motor and Mini-Relay for 440/480 Volt 4412 Heater Contactors and Element Light 4413 12-Hour Timer and Cook Light 4414 Mini-Relay-Thermostat Interrupt 4415 Hold Light Thermostat and Hold Light 4416 150°F Hold Temperature Control 4417 Contactor-Hold Heat and Fan Control SECTION 5 ILLUSTRATED PARTS LIST 51 General 52 Ordering Information 53 Index of Illustrated Parts List 1-1 1-1 1-1 2-1 2-1 2-1 2-1 2-1 3-1 3-1 3-1 3-1 3-2 3-3 3-3 3-3 4-1 4-1 4-1 4-5 Page 4-5 4-5 4-5 4-5 4-6 4-6 4-6 4-6 4-7 4-7 4-7 4-7 4-8 4-8 4-8 4-9 4-9 5-1 5-1 5-1 LIST OF ILLUSTRATIONS Figure SECTION 2 OPERATION Page 2-1 Controls & Indicators SECTION 3 PRINCIPLES OF OPERATION 3-1 Pictorial Schematic- Typical Configuration 2-2 3-2 SECTION 4 TROUBLE-SHOOTING 4-1 4-2 4-3 Wiring Diagram -208/240 Volt, Single & 3 Phase, 4-10 60 Hz Wiring Diagram - 440/480 Volt, 3 Phase, 60 HZ 4-11 Wiring Diagram - 220/380, 240/415 Volt 3-Phase 4-12 50 HZ, 4-Wire Figure Page 4-4 Schematic Diagram - 208/240 Volt, 3-Phase, 4-13 60 HZ 4-5 Schematic Diagram - 220/240 Volt, Single 4-14 Phase, 60 HZ 4-6 Schematic Diagram - 440/480 Volt, 3-Phase, 4-15 60 HZ 4-7 Schematic Diagram - 220/380, 240/415 Volt, 3 4-16 Phase, 50 HZ SECTION 5 ILLUSTRATED PARTS LIST 5-1 Control Panel Assembly 5-2 Electrical Control Assembly 5-2 5-4 LIST OF TABLES SECTION 2 OPERATION 2-1 Controls & Indicators 2-3 SECTION 4 TROUBLE-SHOOTING 4-1 Trouble-Shooting Guide 4-2 Major Electrical Fault Isolation Guide 4-1 4-4 SECTION 1 INTRODUCTION This service and parts supplement to Power Saver II Electric Convection Oven Service & Parts Manual contains descriptive information, trouble-shooting and maintenance information, and parts identification for ovens equipped with Cook & Hold controls. Only information pertinent to these controls is contained in the supplement. For details of standard oven controls and all other assemblies, see Service & Parts Manual 17-0393. 1.1 DESCRIPTION The Model 2400HE Power Saver II Electric Convection Oven has Cook & Hold controls in addition to the standard controls of the Model 2800HE Power Saver II Oven. A selector switch allows the operator to use either standard (COOK) oven operation or COOK & HOLD operation. Controls and circuits specific to COOK & HOLD ovens are included in this supplement. Hold - When the temperature sensor located at the rear of the oven interior registers a temperature drop to 150°F., it activates a temperature control device to maintain the 150°F. temperature for an indefinite period. The control functions through a separate contactor to control a single heating element and the convector fan simultaneously. The control cycles the heater and fan on and off in response to demand of the sensor. A separate Hold light thermostat closes at 150°F. to verify the Hold cycle by lighting the HOLD indicator light. The oven remains in the Hold condition until the 12-hour timer is turned to the OFF position. All other oven operation, including the Cook mode is described in the service and parts manual for the Power Saver II Convection Oven. 1.2 BASIC FUNCTIONING Operation of the oven in the Cook & Hold mode is preceeded by preheating. Preheating is done by placing the selector switch in the COOK (up) position, power switch ON and thermostat set at 350°F. for 15 minutes operation. Initial Roasting - The oven is then loaded, the selector switch placed in the COOK & HOLD (down) position, the thermostat set to the required roasting temperature and the 12-hour timer set for the approximate roasting time. (Times vary from normal roasting and are supplied by Market Forge in Operator's Manual 17-0405). The convector fan will operate and the COOK light will come on indicating contactors have closed to heating element circuits and roasting cycle has begun under control of the thermostat. 1.3 SERVICE Should repairs be required, a network of authorized service agencies is available to assist with prompt service. A current Director of Authorized Service Agencies and service assistance may be obtained by contacting: Product Service Department Market Forge 35 Garvey Street Everett, Massachusetts 02149 Tel.: (617)387-4100 Product Service Department Market Forge Canada Ltd. 1375 Aimco Boulevard, Unit 5 Mississauga, Ontario, Canada L4W 1 B5 Tel.: (416) 621-9252 The model and serial numbers must be referenced when corresponding with Market Forge. Residual Heat Roasting - When the 12-hour timer setting has elapsed and the dial has returned to the "0minute" position, the thermostat and fan circuits are interrupted to stop fan and heating element operation. During this cycle only stored heat is used for cooking, which continues until the oven temperature drops to 1 50°F. 1-1 17-0406 SECTION 2 OPERATION 2.1. OPERATING CONTROLS AND INDICATORS All controls required to operate the Power Saver II with Cook & Hold are listed in Table 2-1 with a short functional description of each. Figure 2-1 shows the physical location of each control and indicator. 3. Unload oven and proceed as follows: a. If oven is to be turned off, place thermostat dial and power switch in OFF position. b. If oven temperature is to be reduced, reset thermostat to the desired temperature and close the right door. Fan will continue to operate with left door open. When ELEMENTS indicator light comes on, oven is at lower temperature. Left door is then closed until light comes on to show that temperature has stabilized. 4. Leave doors ajar if shut-down is to be longer than one day. 2.2 OPERATING PROCEDURES The Cook & Hold oven may be used as either a standard oven or an oven which roasts and then automatically holds at 150°F. for an indefinite period. Instructions for operation in either cooking mode are included in this section. 2.2.3 Cook & Hold Operation The oven is ready for cooking use when the ELEMENTS indicator light goes out following preheating, (See subsection 2.2.1). For Cook & Hold operation proceed as follows: 1. Load food into oven and close doors. 2. Place selector switch in COOK & HOLD (down) position. 3. Reset thermostat dial to initial roasting temperature. (See Operators Manual, #17-0405 for recommended temperature settings). 4. Set 12-HOUR timer (5-Hour Timer on some early units) to approximate roasting time. (See Operator's Manual #17-0405 for recommended time settings). COOK indicator light will come on and stay on throughout Cook & Hold operation. NOTE Once controls are set, all operation is automatic and continuous. At end of primary cooking cycle, when 12-HOUR timer dial has returned to '0minute' position, fan and heaters will shut off. Product continues to cook with stored heat. 12HOUR timer must be left at '0-minute' position for automatic operation to continue. 2.2.1 Preheating 1. Arrange shelf positions according to the food product to be cooked. Refer to Test Kitchen Bulletin #41 for correct positioning. 2. Place selector switch in the COOK (up) position and close doors. 3. Place power switch in the ON position. Fan will begin rotating. 4. Set thermostat dial to desired cooking temperature. ELEMENTS indicator light will come on. 5. Allow oven to preheat for about 15 minutes. Preheating is complete when ELEMENTS indicator light goes out. 2.2.2 Cook Mode Operation The oven is ready for cooking use when the ELEMENTS indicator light goes out following preheating, (See subsection 2.2.1). For standard cooking proceed as follows: 1. Load food into oven and close doors. 2. Set 60 MINUTE timer for desired cooking time. Buzzer will sound at end of preset interval. For cooking times longer than 60 minutes, reset timer for additional time. (Timer is a convenience feature only and has no oven controlling function). 2-1 17-0406 2-2 COOK & HOLD POWER SAVER CAUTION Do not open doors or return timer dial to OFF position until ready for oven unloading. If doors are accidentally opened product must be finished in Cook mode with meat thermometer used to test doneness. 5. Unload the oven at any time after the HOLD light comes on. NOTE HOLD light comes on when oven temperature drops to 150°F. to indicate cooking is completed and product is on hold for unloading as needed. Heat and fan will operate intermittently as needed to maintain 150°F. 6. Return 12-HOUR timer to OFF position when all product has been removed from the oven. 7. Place thermostat dial and power switch in OFF positions and leave doors ajar for daily shut down. Figure 2-1. Controls and Indicators 17-0406 OPERATION 2-3 TABLE 2-1 OPERATING CONTROLS AND INDICATORS FIGURE 2-1 REF. DESCRIPTION FUNCTION 1 Circuit Breaker Protects control circuits and convector fan motor. Must be in ON position for oven to operate. 2 Power Switch Controls electrical power to control circuits and convector fan motor. Must be in ON position for oven to operate. 3 Cook/Cook & Hold Selector Switch Selects standard (Cook mode) baking and roasting or Cook & Hold mode. 4 Thermostat Control Regulates oven temperature. Controls heating element operation. 5 Element Indicator Light Indicates when lit that thermostat is calling for heat. Cycles on and off with thermostat control. 6 60-Minute Timer Electric timer to aid operator in timing Cook mode operation. Does not control oven operation. Sounds buzzer at end of timed interval. Place in OFF position to silence buzzer. Controls duration of primary roast cycle in Cook & Hold mode. When preset time has elapsed, timer is left at '0 -hour' position until stored heat 7 8 12-Hour Timer Cook Indicator Light cooking is completed. Product is cooked and can be held or used as desired when HOLD light comes on. Timer setting is changed from '0minute' to OFF only when oven is unloaded. Indicates when lit that 12-HOUR timer has been set, and that selector switch is in COOK & HOLD position. Remains on through-out all phases of Cook & Hold operation. 9 Hold Indicator Light Indicates when lit that oven is in Hold phase of Cook & Hold mode and will maintain 150°F. 65°C. until 12-Hour timer is manually shut off. 17-0406 SECTION 3 PRINCIPLES OF OPERATION 3.1 GENERAL The model 2400 HE Electric Convection Ovens are equipped with an optional factory installed control system which povides operator selection of standard (Cook) operation or Cook & Hold operation. The oven is otherwise constructed like model 2800 HE Power Saver II. Principles of operation for the oven as a whole are included in section 4 of service and parts manuals #17-0393. The following description of functions and controls is for Cook & Hold models only. A third identical contactor controls the power circuit to a single 2600 watt heating element during the 'Hold' cycle of Cook & Hold operation. It opens and closes under the control of a 150°F. temperature control device. Only two sets of contacts are required for heater control. The third is used for simultaneous onoff control of the fan motor. 3.2.2 Cook Mode Controls With the control panel circuit breaker in the ON position 208 to 220 volt service is connected to the power switch. The power switch is the routine on-off control for the oven. A normally open switch actuated by closing the right side oven door functions as a circuit interrupter to prevent operation unless the door is closed. Power is brought up to the control components when the power switch is in the ON position and the right side door is closed. A double-pole, double-throw selector switch which functions as the mode selector switch is placed in the COOK (up) position. The convector fan begins to operate immediately, remaining on continuously during Cook mode operation. The 475°F. (maximum setting) thermostatic control is set to the required preheat or baking temperature. Setting the dial when the oven is cold automatically closes the thermostat contacts to light the ELEMENTS indicator light and energize the two contactor coils controlling the heating elements. Thermostat contacts remain closed until the capillary bulb inside the oven senses sufficient temperature rise to open them. Elements are cycled on and off by the thermostat as needed to maintain temperature setting. A 60-minute electric timer included as an operator convenience has no controlling function. The dial is set to the required oven operating time. At the end of the timer setting a buzzer sounds until the dial is returned to the OFF position. 3.2 THEORY OF OPERATION Cook & Hold controls include power circuits and control circuits for operation of the oven in two modes. A brief description of the sequence of events and interdependence of components in each mode follows. Simplified Schematic figure 3-1 shows the interrelationship of each component described below. 3.2.1 Power and Heating Element Operation Incoming power is supplied to the oven from a terminal block at the lower, front right side of the oven. Power is connected from the terminal block to three contactors which control operation of heating elements. (A fourth contactor in 440/480 volt units is used for the fan motor). A single phase branch circuit from the terminal block connects to the control panel circuit breaker. (In 440/480 volt ovens, a step-down transformer is included before the circuit breaker to supply 220 to 240 volts). When the control circuit thermostat requires heat in either the Cook mode or the 'Cook' cycle of the Cook & Hold mode of operation, two contactors are energized to power the five heating elements inside the oven. When satisfied, the thermostat opens the coil circuit to break power to the heaters. On-off operation proceeds throughout oven operation. 3-1 3-2 COOK & HOLD POWER SAVER II Figure 3-1. Pictorial Schematic — Typical Configuration 3.2.3 Cook & Hold Mode Operation The same control circuit components are utilized for Cook & Hold operation as for the Cook mode except for the 60-minute timer. Setting the selector switch in the COOK & HOLD (down) position supplies power to control components for that mode. In normal use the oven is first preheated in the Cook mode as described in 3.2.2. The thermostat is then set to the required initial roasting temperature prior to switching to Cook & Hold. Immediately on setting the selector switch to COOK & HOLD, the COOK indicator light turns on. The 12-hour timer, used for this mode, is set for the initial roasting time. Timer contacts close to the fan motor circuit to begin operation. 17-0406 Another circuit is closed to energize the coil of a normally open single-pole relay (C4) which in turn completes the circuit between the thermostatic control and the heater contactor coils. Controls operate in these positions, with timer motor running under the continuous on-off control of the thermostat. When the 12-hour timer setting elapses, the common element transfers to complete a circuit to 'Hold' cycle components. Simultaneously the timer motor and convector fan motor circuits are opened. The relay contacts between the thermostat control and heater element contactors are opened to interrupt control by the thermostat. The oven is now in residual heat roasting with only the COOK indicator light on. The residual cycle continues until, by normal oven heat loss, the interior temperature drops to 150°F. PRINCIPLES OF OPERATION The 'Hold' cycle of Cook & Hold operation is controlled by a solid state 150°F. temperature control. A thermistor probe mounted inside the oven activates the control when the temperature drops to 150°F. Control contacts close to complete a circuit to the contactor coil for single heater and fan operation in the 'Hold' cycle. Each time the 150°F. control contacts close the contactor pulls in to power one 2600 watt heating element and the convector fan. On-off operation proceeds throughout the 'Hold' cycle, varying approximately + 1°F.from 150°F. Simultaneous with 150°F. control operation, a separate (normally closed at room temperature), thermostat for the HOLD light senses interior oven temperature. On temperature drop to 150°F. its contacts close to turn on the HOLD light. Unlike the 150°F. control device, the light thermostat operates in a wide temperature range from 150°F. to 170°F. It keeps the HOLD light on throughout the 'Hold' cycle, while the oven temperature fluctuates above and below 150°F. The 150°F. temperature control and HOLD light thermostat operate throughout the 'Hold' cycle until interrupted. Placing the 12-hour timer dial in the OFF position terminates operation of both thermostatic controls. 3.3 ELECTRICAL CIRCUITS The electrical circuits for Cook & Hold controls consist of the 208/220 or 440/480 volt power circuits and the 208/220 volt control circuits. They contain all contactors, relays, switches, timers, indicator lights and wiring required for oven operation. 3.3.1 Power Circuit Components The power circuits are shown in wiring diagrams and schematic diagrams, figures 4-1 through 4-7. Line voltage is connected to the line terminals of two 30 Amp. contactors. Contactor load terminals are connected to the leads of two 1300 watt and three 2600 watt heating elements mounted inside the oven. A third 30 Amp. contactor is connected to two input poles with output to one 2600 watt element for use in the 'Hold' cycle only. A fourth 10 Amp. contactor is used for fan motor control in 440/480 volt units only. All power circuit controls are activated by the control circuits. 3-3 3.3.2 Control Circuit Components Control circuits are shown in wiring diagrams and schematic diagrams figures 4-1 through 4-7. Control circuits are powered from a branch line off L3 and one other terminal block terminal depending on voltage characteristics for the oven. Input controls have common use for both Cook and Cook & Hold modes up to the selector switch. Beyond the mode selector switch many controls are used for one mode only. Components for each mode are described in the following paragraphs. 3.3.2.1 Control Circuit Components For Both Modes. The components which control power to both Cook and Cook & Hold controls include the following: 1. Transformer - (440/480 volt ovens) -A 440/480 volt to 220/240 volt step-down transformer supplies input power for the control circuit. The primary field windings are connected to L2 and L3 terminal block locations. 2. Circuit Breaker - 15 Amp., 2-pole circuit breaker provides overload protection for the control circuit. Normally left in the ON position, it supplies 208 to 220 volts to the power switch. 3. Power ON-OFF Switch - A double-pole, doublethrow toggle switch provides routine on-off control for the oven. In the ON position it connects through one pole to the door switch, and through the second pole to the L3 power feed for all components. 4. Door Switch - A single-pole, normally open, microswitch actuated by closing the right side oven door. It serves as a circuit interrupter, stopping all oven operation unless the door is closed. When closed it completes the circuit from one selector switch common element to the 475°F. operating thermostat contacts. 5. Thermostat Control - A maximum setting 475°F. control for oven operating temperature. A capillary bulb mounted inside the oven is permanently connected to the bellows in the control. When thermostat contacts are closed a circuit is completed to one common element of the selector switch. 17-0406 3-4 6. Mode Selector Switch - A double-pole, double-throw toggle switch for selection of Cook or Cook & Hold operation. Power is supplied to the two common elements through controls described above. Output terminals are connected with appropriate components for each mode. 3.3.2.2 Cook Mode Components. The only components used exclusively for Cook mode operation are the 60-minute timer and buzzer. The timer is a convenience item only and has no controlling function. When the dial is set the common element closes a circuit to the timer motor to maintain timer operation. At the '0' minute setting the common element switches to contacts for the buzzer circuit. The buzzer sounds until the timer knob is placed in the OFF position. Other components used for the Cook mode are the ELEMENTS indicator light and heater element contactors which cycle on and off by control of the 475°F. thermostat control. The convector fan operates continuously. 3.3.2.3 Cook & Hold Mode Components. When the selector switch is placed in the COOK & HOLD position the following components function to control operation. 1 12-Hour Timer - The timer controls the duration of initial roasting and switches to the 'Hold' cycle. The common element is connected to one Cook & Hold terminal of the mode selector switch. When set for initial roasting, the timer completes a circuit to the convector fan motor and timer motor, and closes a relay in the thermostat circuit to the heater contactors. At the end of the initial roasting period the common element switches to the hold component circuit. It remains in this position until the dial is moved to the OFF position. 2. Relay C4-A single-pole, normally open relay. Its coil is energized when the 12-hour timer is set for initial roasting with closed contacts completing the circuit from the 475°F. therm- COOK & HOLD POWER SAVER II ostat control to heater contactors. When the 12hour timer reaches '0' hours, the relay coil circuit is opened, in turn causing relay contacts to open so that the 475°F. thermostat circuit to heater contactor is interrupted. 3. COOK Light - The light (red lens) is connected to one selector switch terminal for Cook & Hold operation. It comes on immediately upon setting the switch. 4. 150°F. Temperature Control - A solid state temperature actuated switch device, with switch contacts normally open at room temperature. It is actuated by a thermistor probe mounted inside the oven and connected electrically to the control. Operating potential is connected from L3 on one side, and the 'Hold' cycle terminal of the 12-hour timer on the other. The control/probe system functions to maintain 150°F. temperature during the 'Hold' cycle. When the oven temperature drops to 150°F. at the end of residual heat roasting, the control contacts close a circuit to the coil of the contactor for 'Hold' cycle heater and fan control. The contactor opens and closes under the control of the 150°F. control until the 12-hour timer dial is returned to the OFF position. 5. HOLD Light Thermostat And HOLD Light - A separate button type thermostatic switch, normally closed at room temperature is used to control HOLD light operation. Its contacts close on temperature drop to 150°F. and open on rise to 170°F. It functions to keep the HOLD light on continuously during the 'hold' cycle. 17-0406 SECTION 4 TROUBLE-SHOOTING 4.1 GENERAL The information in this section is intended to assist service personnel in locating the source of problems which may occur with the Cook & Hold Controls in a Power Saver II Convection Oven. Before following any of the procedures given in this section, the service person should be thoroughly familiar with the operating instructions and the function of all controls described in section 2. If the problem cannot be readily corrected, the nearest authorized Market Forge service agency should be contacted for assistance. 4.2 TROUBLE-SHOOTING GUIDE A general trouble-shooting guide for use by service personnel is given in Table 4-1. 4.3 ELECTRICAL FAULT ISOLATION Correction of an electrical fault 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 oven will be sufficient to isolate it to one or more circuit elements. Table 4-2 is provided as a guide for isolating electrical faults. TABLE 4-1 TROUBLE-SHOOTING GUIDE PROBLEM Probable Cause Remedy 1. CONVECTOR FAN FAILS TO OPERATE WlTH SELECTOR SWITCH IN COOK POSITION. a. Power to oven is off. Locate external circuit breaker for power and place in ON position. See 4.4.2, 4.4.3, 4.4.4 for test. b. Circuit breaker open. Reset to ON position. See 4.4.5 for test. c. Power ON-OFF switch off. Place in ON position. See 4.4.6 for test. d. Right side oven door open. Close door. See 4.4.7 for test. e. Faulty circuit breaker, power switch, door switch, wiring or fan motor. Test each component and connecting wiring. See 4.4.5, 4.4.6. 4.4.7, 4.4.11. f. Faulty mini-relay (C5), (440-480 volt ovens only). Test relay and connecting wiring. See 4.4.11. 2. OVEN WILL NOT HEAT WITH SELECTOR SWITCH IN HOLD POSITION, THERMOSTAT AT MAXIMUM SETTING ELEMENTS LIGHT NOT ON. a. Faulty operating thermostat or wiring. Test thermostat and connecting wiring. See 4.4.8. b. Thermostat contacts or capillary bulb faulty. Replace thermostat. 4-1 4-2 COOK & HOLD POWER SAVER II PROBLEM Probable Cause 3. 4. 5. 6. 7. Remedy OVEN WILL NOT HEAT WITH SELECTOR SWITCH MAXIMUM IN COOK POSITION, THERMOSTAT AT MAXIMUM SETTING, FAN OPERATING AND ELEMENTS LIGHT ON. a. Faulty contactor (C1 or C2). Test contactor and connecting wiring. See 4.4.12. b. Faulty heating elements. Check heating elements and wiring. See 4.4.12. ERRATIC OR UNEVEN HEATING WITH SELECTOR SWITCH IN COOK POSITION. a. Faulty operating thermostat operation. Recalibrate or replace as required. See Service & Parts Manual 17-0393, Subsection 6.3.2 and and 6.4.5. See 4.4.8. b. One or more heating elements inoperative. Check wiring to elements, check for burned out elements. See 4.4.12. BUZZER FAILS TO SOUND AT END OF COOK MODE OPERATION. a. 60-Minute timer not set. Set timer. b. Faulty 60-Minute timer. Test timer and replace as required. See 4.4.10. c. Faulty buzzer or wiring. Test buzzer and connecting wiring. See 4.4.10. COOK LIGHT FAILS TO COME ON WITH SELECTOR SWITCH IN COOK & HOLD POSITION. a. Power to oven is off. Locate external circuit breaker for power and place in ON position. See 4.4.2, 4.4.3, 4.4.4. for test. b. Circuit breaker open. Reset to ON position. See 4.4.5 for test. c. Power ON-OFF switch off. Place in ON position. See 4.4.6 for test. d. Right side oven door open. Close door. See 4.4.7 for test. e. Faulty circuit breaker, power switch, door switch, wiring or Cook light bulb. Test each component and connecting wiring. See 4.4.5, 4.4.6, 4.4.7, and 4.4.13. OVEN WILL NOT HEAT WITH SELECTOR SWITCH IN COOK & HOLD POSITION, THERMOSTAT AT MAXIMUM SETTING, 12-HOUR TIMER SET AND ELEMENTS LIGHT NOT ON. a. Faulty operating thermostat or wiring. Test thermostat and connecting wiring. b. Thermostat contacts or capillary bulb faulty. Replace thermostat. c. Selector switch faulty. Test switch and connecting wiring. See 4.4.9. d. Faulty 12-Hour timer contacts. Test timer and replace as required. See 4.4.13. e. Faulty mini-relay (C4). Test relay and connecting wiring. Replace as required. See 4.4.14. 17-0406 TROUBLE SHOOTING 4-3 PROBLEM Probable Cause Remedy 8. OVEN WILL NOT HEAT WITH SELECTOR SWITCH IN COOK & HOLD POSITION THERMOSTAT AT MAXIMUM SETTING, 12-HOUR TIMER SET AND ELEMENTS LIGHT ON. a. Faulty contactor (C1 or C2). Test contactor and connecting wiring. See 4.4.12. b. Faulty heating elements. Check heating elements and connecting wiring. See 4.4.12. 9. CONVECTOR FAN FAILS TO OPERATE WITH SELECTOR SWITCH IN COOK & HOLD POSITION, 12HOUR TIMER SET AND COOK LIGHT ON. a. Faulty 12-hour timer. Test timer. See 4.4.13. b. Faulty fan motor. Test fan motor and connecting wiring. See 4.4.11. 10. OVEN CONTINUES TO HEAT AT THERMOSTAT SETTING WITH SELECTOR SWITCH IN COOK & HOLD POSITION AND 12-HOUR TIMER DIAL AT '0' HOUR POSITION. a. 12-Hour timer faulty. Test timer. See 4.4.13. b. Defective mini-relay (C4). Test relay and connecting wiring. See 4.4.14. 11. OVEN FAILS TO GO INTO HOLD CYCLE (FAN SHOULD CYCLE ON AND OFF) WITH SELECTOR SWITCH IN COOK AND HOLD POSITION AND 12-HOUR TIMER AT ‘0’ HOUR POSITION. a. Internal oven temperature above 150°F. Wait for oven temperature to drop. (Left door may be opened to cool for test purposes only). b. 150°F. Sensor Probe faulty. Test sensor and replace as required. See 4.4.16. c. 150°F. Temperature control faulty. Test control and replace as required. See 4.4.16. d. Contactor (C3) faulty. Test contactor coil and contacts. See 4.4.17. 12. HOLD LIGHT FAILS TO COME ON IN HOLD CYCLE OF COOK & HOLD, WITH CONVECTOR FAN OPERATING INTERMITTENTLY. a. Hold light thermostat faulty. Test thermostat and replace as required. See 4.4.15. b. Hold light bulb burned out. Test and replace as required. See 4.4.15. 4-4 COOK & HOLD POWER SAVER II TABLE 4-2 MAJOR ELECTRICAL FAULT ISOLATION GUIDE FAILURE FAULT LOCATION 1. Oven will not operate in either Cook a. Incoming power. See 4.4.2, 4.4.3, 4.4.4. or Cook & Hold mode. b. Circuit breaker. See 4.4.5. c. Power switch. See 4.4.6 d. Door switch. See 4.4.7. e. Thermostat control. See 4.4.8. f. Selector switch. See 4.4.9. g. Wiring. 2. Operates in Cook mode but not 'Cook' cycle of Cook & Hold mode. a. Selector switch. See 4.4.9. b. 12-Hour timer. See4.4-13. c. Mini-relay (C4). See 4.4.14. d. Wiring. 3. Operates in 'Cook' cycle of Cook & Hold mode but not in Cook mode. a. Selector switch. See 4.4.9. b. 60-Minute timer. See 4.4.10. c. Buzzer. See 4.4.10. d. Wiring. 4. Operates in 'Cook' cycle but not in 'Hold' cycle of Cook & Hold mode. a. 12-Hour timer. See4.4-13. b. Mini-relay (C4). See 4.4.14 c. 150°F. Sensor probe. See 4.4.16. d. 1 50°F. Temperature control. See 4.4.16. e. Contactor (C3). See 4.4.17. f. Wiring. 5. In 'Hold' cycle of Cook & Hold mode HOLD light fails to come on. a. HOLD light thermostat. See 4.4.15. b. HOLD bulb or socket. See 4.4.15. c. Wiring. 6. Convector fan motor doesn't operate in Cook mode. ELEMENTS light is on. a. Selector switch. See 4.4.9. b. Fan motor. See 4.4.11. c. Wiring. 7. Convector fan motor operates in Cook a. 12-Hour timer. See4-4.13. mode but not in 'Cook' cycle of Cook & b. Contactor (C3). See 4.4.17. Hold mode. COOK light is on. c. Mini-relay (C5), (440/480 volt only). See 4.4.11. d. Fan motor. See 4.4.11. e. Wiring. 8. Oven fails to heat or heats unevenly a. Heater contactors See 4.4.12. in either Cook mode or 'Cook' cycle b. Heating elements. See 4.4.12. of Cook & Hold mode. ELEMENTS c. Selector switch. See 4.4.9. light is on. d. Mini-relay(C4). See 4.4.14. e. Wiring. 17-0406 TROUBLE SHOOTING 4.4 ELECTRICAL TROUBLE-SHOOTING PROCEDURES Electrical trouble-shooting procedures which follow require access to components and terminals of the operating controls. Wiring and terminal locations are shown in figures 4-1,4-2 and 4-3. Figures 4-4, 4-5,4-6 and 4-7 show the circuits in schematic form. To begin testing, all operating controls should be in the OFF position and the selector switch in the COOK (up) position. The four screws which secure the control panel are removed and the panel pulled forward to the extent of free play in the wiring. All control terminals are now exposed for testing. GENERAL WARNING Use extreme care when working on components of the electrical control panel and electrical control assembly. When power is supplied to the oven, all exposed terminals carry at least 208 volts. 4-5 lug beside the terminal block and the proper voltage (as noted on the rating plate) is present, the fault lies in the electrical circuits of the oven. 4.4.3 General Oven Test Amprobes can be used to test oven operability. Due to the two modes of operation and several cycles within the Cook & Hold mode, amp draw alone is not a conclusive test, but serves as a general test of proper oven operation. To test total load proceed as follows: 1. Place control panel circuit breaker in ON position, power switch in ON position, close right side oven door and set thermostat dial to any setting. 2. Place selector switch in the COOK (up) position and check L1, L2 and L3 using amp-probes. ELEMENTS light should be on. Correct line loads are: 4.4.1 Trouble-Shooting Sequence Electrical trouble-shooting procedures in this section are arranged to follow, as nearly as possible, the normal sequence of electrical events in Cook & Hold controls. In most cases, the correct operation of any single electrical component will depend upon its inputs, which in turn depend upon the correct operation of the preceding components or the wiring and connections between them. Table 4-2 isolates electrical problems to a single electrical component or to a group of components. Using the information in this table, it should not be necessary to perform all component trouble-shooting procedures, but to check only that component, or group of components, suspected of being at fault. 4.4.2 Incoming Power Before trouble-shooting any of the electrical parts or assemblies, make sure power is being supplied to the terminal block. (The terminal block is located behind the right end of the lower oven trim strip) or contactor terminals T1, T2, T3. With power connected to the oven an a-c voltmeter is used to measure across all three terminals. If the oven is grounded to the ground Voltage Phase L1 L2 L3 208 3 30 26 25 240 440 480 208 240 3 3 3 1 1 25 14 13 50 44 22 12 11 0 0 21 12 11 50 44 3. Place selector switch in COOK & HOLD (down) position and set 12-Hour timer to '1' hour position. Check L1, L2 and L3 with amprobes for same values as in step 2. 4. Return all controls to their OFF position-selector switch to COOK position. If amprobe test fails to yield stated amperage values, or values are obtained but oven fails to operate correctly, proceed with trouble-shooting procedures. Otherwise oven operation is satisfactory. 4.4.4 Transformer, (440-480 volt service only) Once 440-480 volts has been confirmed at the terminal block, oven failure to operate could be caused by a defective step-down transformer which supplies 220-240 volt service to the control circuits. To check the transformer, proceed as follows: 1. Turn on building power to the oven. 17-0406 4-6 COOK & HOLD POWER SAVER II 2. Using an a-c voltmeter measure the voltage across line terminals 'H4' and 'H1'. Meter should read 440 to 480 volts. If not, check the wiring between the transformer, contactors and terminal block. 3. Measure the voltage across load terminals 'X1' and 'X4'. A reading of 220 to 240 volts should be obtained. If not the wiring to the transformer or the transformer is defective. 4.4.5 Circuit Breaker (Schematic Reference S1). A defective circuit breaker causes total inoperability; i.e. the oven will not operate in either Cook or Cook & Hold modes of operation. To check the circuit breaker, proceed as follows: 1. Turn on building power to the oven. 2. Place circuit breaker in ON position. 3. Using an a-c voltmeter measure the voltage across circuit breaker input terminals. A reading of 208 to 220 volts should be obtained. If not, check the wiring between the circuit breaker and the contactors and terminal block. 4. Measure the voltage across output terminals. A reading of 208 to 220 volts should be obtained. If not and inputs are correct, then circuit breaker is defective. 4.4.6 Power ON-OFF Switch, (Schematic Reference S2). Failure of the oven to operate in either Cook or Cook & Hold modes could be caused by a defective power switch. To check the power switch, place the switch in the On position and proceed in the same manner as for the circuit breaker (paragraph 4.4.5). Once the switch checks out, one voltmeter lead can be clamped onto the output terminal connected by wire #28 and left for many of the tests which follow. It becomes the L3 reference to which all other circuits and components can be verified. 4.4.7 Door Switch, (Schematic Reference S3). A defective door switch will prevent the oven from operating in either the Cook or Cook & Hold modes with all controls properly set and the right 17-0406 side oven door tightly closed. To check the switch: 1. Close the right side oven door tightly and check that circuit breaker and power switch are both in ON positions. 2. Using an a-c voltmeter measure the voltage potential between L3 reference point and thermostat control terminal connected by wire #35. If reading of 208 to 220 volts is obtained, door switch and wiring are o.k. If not proceed to step 3. 3. Remove upper oven trim strip to access door switch. Repeat voltage test between L3 reference point, input door switch terminal and output terminal. Failure of either test indicates either faulty connecting wiring or the switch itself. If both check out, output wire #35 is faulty or loose. 4. Replace upper oven trim strip. 4.4.8 Operating Thermostat Control, (Schematic Reference S4). A defective or punctured capillary bellows system may cause continuous operation of the heating elements. If this occurs and recalibration of the thermostat (explained in Power Saver II Service & Parts Manual #17-0383, subsection 6.3.2) fails to correct the problem, the entire thermostat control must be replaced. Defective contacts will result in failure of the oven to heat when the thermostat knob is set to the desired temperature. To test contacts be sure the circuit breaker and power switch are in the ON positions and right side oven door is tightly closed, then: 1. Rotate thermostat dial to maximum setting (475°F.) 2. Using an a-c voltmeter measure the voltage between L3 reference point and thermostat control output terminal connected by wire #37. If voltage is 208 to 220 volts, contacts are o.k. If not, thermostat or input wiring is faulty and must be replaced. TROUBLE SHOOTING 4.4.9 Selector Switch, (Schematic Reference S5). A defective selector switch may be the cause of failure to operate in both Cook and Cook & Hold modes, or failure to operate in one mode only. To check the selector switch place the circuit breaker and power switch in the ON positions, close the right side oven door, set the thermostat control at 475°F. and proceed: 1. Place the selector switch in the COOK (up) position. 2. Using an a-c voltmeter, measure the voltage between L3 reference point and the common elements of the 2-pole selector switch. If a 208 to 220 volt reading is not obtained for each, the connecting wiring is faulty, (wires #36 and #37). 4-7 3. Check timer motor advance against a reliable timepiece for 5 to 10 minutes. If dial moves to proper time setting the motor is O.K. If not the motor contacts or wiring are faulty. 4. Set 60-minute timer dial to '0' minute position. (An audible click should be heard). If operation is correct the buzzer will sound. Timer and buzzer are functioning correctly. If not, proceed to step 5. 5. Move voltmeter probes to timer terminal #4 and L3 reference point. If 208 to 220 volt reading is present timer contacts are O.K., but the buzzer or connecting wiring are faulty. 6. Return 60-minute timer dial to the OFF position. 4.4.11 Fan Motor (and Mini-Relay for 440/ 480 Volt),(Schematic Reference M3 and C5). 3. Measure the voltage between L3 reference point and closed contacts to terminal connected by wire #40 and then by terminal connected by wire #41. If a 208 to 220 volt reading is not obtained, the switch is faulty. The fan should operate automatically with an audible fan sound when the circuit breaker and power switch are in the ON positions, the right side door is tightly closed and the selector switch is in the COOK position. If it fails to operate: 4. Place the selector switch in the COOK & HOLD (down) position and check voltage across closed contacts to the terminal connected by wire #39 and the terminal connected by wire #38. 208220 voltage must be obtained. 1. Check voltage across the motor from L3 reference point to 60-minute timer terminal #1. If 208 to 220 volt reading is obtained, then the fan motor or connecting wiring is defective. 2. For 440/480 volt ovens, check voltage across minirelay coil (C5) in same manner as in step 1. If 208 to 220 volt reading is obtained and relay fails to pull in, then relay is defective. 4.4.10 60-Minute Timer and Buzzer, (Schematic Reference M2 and R5). A defective timer motor will cause failure of the dial to rotate back to the '0' minute position when set. Faulty timer contacts will result in failure of the timer motor to turn the dial or for the buzzer to sound when the dial reaches the '0' minute position. With the circuit breaker and power switch in the ON positions, right side door closed, selector switch in the COOK position, check as follows: 4.4.12 Heater Contactors and ELEMENTS Indicator Light, (Schematic Reference C1, C2 and R3). Failure of contactors C1 or C2 can result in heating elements not operating. Test these with the circuit breaker and power switch in ON positions, right side oven door closed tightly, thermostat control set at 475°F. and selector switch in the COOK (up) position. 1. Set 60-minute timer dial to the 10-minute position. 1. Check ELEMENTS indicator light. If not lit, bulb, socket or wiring are defective. 2. Measure potential across the timer motor contacts by placing voltmeter probes at L3 reference point and terminal #3 of timer. If 208 to 220 volt potential is present the contacts are O.K. 17-0406 4-8 2. Using an a-c voltmeter measure the voltage across contactor coil (C1) and (C2) by placing probes across coil terminals for each. If both read 208 to 220 volts and oven fails to heat, or heats unevenly, then contactor or elements are faulty. 3. Check 208/220 or 440/480 volt potential across contactor C1 and C2 output terminals, (L1, L2, L3). If proper voltage is not present then contactors are faulty and must be replaced (See oven rating plate). If proper voltage is present then one or more heating elements or connecting wiring are faulty. (See Power Saver II Service & Parts Manual #17-0393, subsection 6.4.4 for removal instructions). 4.4.13 12-Hour Timer and COOK Light, (Schematic references M1 and R1), (5-Hour timer used in early models). A defective 12-hour timer can cause failure of the oven to operate correctly in the Cook & Hold mode. With the circuit breaker and power switch in the ON positions, right side oven door closed, operating thermostat set at 475°F. and selector switch in the COOK & HOLD position, proceed with testing. 1. Check that COOK indicator light is lit. If not, bulb, socket or wiring are faulty. 2. Set 12-hour timer dial to the 1/2 hour position. 3. Using an a-c voltmeter, measure the potential across timer contacts by placing probes at terminal #3 and reference point L3. If 208 to 220 volt reading is obtained contacts are O.K. 4. Check timer motor operation against a reliable timepiece for 1/2 hour. If dial moves to proper time setting then the motor and contacts to terminal #3 are O.K. (To expedite the motor test, a continuity check can be made across disconnected motor leads #31 and #46, or from each of these to ground). 5. Set timer dial at '0' hour position. (An audible click should be heard). Place voltmeter probes on timer terminal #4 and L3 reference point. If 208 to 220 volt potential is present, contact to terminal #4 is O.K. If not, timer is defective. COOK & HOLD POWER SAVER 11 6. Return timer dial to OFF position. 4.4.14 Mini-Relay (C4) Thermostat Interrupt, (Schematic Reference C4) A defective mini-relay can cause failure of heating elements and ELEMENTS indicator light to come on in the initial roasting cycle of Cook & Hold operation. The relay is checked with circuit breaker and power switch in the ON positions, right side door closed, operating thermostat set, selector switch in COOK & HOLD position and 12-hour timer set to any time beyond 'O'hour. Mini-relay coil should be energized. 1. Using an a-c voltmeter measure the voltage across coil leads (L3 reference and selector switch terminals connected by wires 41 & 42) at terminals or relay. If 208 to 220 volt reading is obtained and relay fails to pull in relay is defective. If potential present, problem is elsewhere. 2. Check input and load sides of mini-relay contacts (terminals connected by wires #38 & #56) using an a-c voltmeter. Place one probe at L3 reference point and second probe at mini-relay terminal connected by wire #38. If potential present, input circuit is complete. 3. Move second probe to output terminal connected by wire #56. If 208 to 220 volt reading is present then contacts are O.K. If not, relay is defective. 4. Return 12-hour timer to OFF position. 4.4.15 Hold Light Thermostat and HOLD Light. (Schematic reference S6 and R2). A separate thermostat (normally closed) located at the right rear of the oven interior is used to control operation of the HOLD indicator light. To check the thermostat and light, place controls in ON position for Cook & Hold mode with 12-hour timer set at '0' hour position. HOLD light should be lit if oven interior is at or below 150°F. 1. Check that HOLD light is on. If it is, timer, thermostat and light are functioning properly. If not, open left side door to be sure oven is sufficiently cool. If light still not on, proceed to step 2. 17-0406 TROUBLE SHOOTING 4-9 2. Isolate the thermostat by removing the wire nut connecting wires #54 and #55, place one voltmeter probe there and the other at L3 reference point. If thermostat is operating correctly, 208 to 220 volt potential should be present. If potential isn't present thermostat or connecting wiring are defective. If potential is present the problem is with the HOLD light, socket or connecting wiring. 2. Measure the voltage across control terminal #8 and L3 reference point. If the HOLD light is not lit, open the left side oven door until the oven interior temperature drops enough for light to come on and fan to operate. When light comes on, meter should read 208 to 220 volts. If not, control is defective and must be replaced. NOTE It is possible that the 150°F. control can be 'off while the HOLD light is on. The HOLD light operates through a separate thermostat at a higher temperature range of 150-170°F. 4.4.16 150°F. Hold Temperature Control. (Schematic reference R4). A solid state temperature control, entirely separate from the operating thermostat, controls oven operation in the 'Hold' cycle of the Cook & Hold mode. Should the oven fail to maintain the 150°F. hold temperature, the control and temperature probe should be checked. 3. Close the left side door and observe that voltage returns to zero volts when temperature rises again (fan not operating). Again open left side door and check 208 to 220 volts when temperature drops below 150°F, (fan operating). If not, sensor is defective and must be replaced. 4.4.16.1 150°F. Sensor. The sensor is a thermistor probe which is normally closed at room temperature. A defective sensor will result in failure of the oven to maintain 150°F. in the 'Hold' cycle of the Cook & Hold mode. To check the sensor proceed as follows: 1. Turn off power to the oven by placing the circuit breaker in the OFF position. 2. Disconnect sensor wires from terminals #2 and #4 of the 150°F. temperature control. 3. Connect an ohmmeter between the leads while the oven is at room temperature. A reading of 112 ohms should be obtained, if not, sensor is defective and must be replaced. 4.4.17 Contactor (C3)—Hold Heat and Fan Control (Schematic reference C3). Failure of C3 contactor will prevent fan and single heating element operation in the 'Hold' cycle of the Cook & Hold mode. Place all controls in the operating position for Cook & Hold operation with the 12-hour timer in the '0' hour position. Leave left side door open. 1. Using an a-c voltmeter measure the voltage across C3 coil terminals. Meter should read 208 to 220 volts. If it does and contacts fail to pull in, contactor is defective. If contacts pull in but heater and fan fail to operate, proceed to step 2. 4. Replace leads on temperature control and return circuit breaker to ON position. 2. Measure the 208/220 or 440/480 voltage across contactor input terminals T1 and T2 and line terminals L1 and L2. (Check rating plate for correct power circuit voltage.) If proper voltage is not present at L1 and L2, contactor is defective. 3. Measure voltage between contactor terminal L3 to which wire #44 is connected and L3 reference point. If voltage is present, contact to L3 is O.K. If not, contactor or input circuit is faulty. 4.4.16.2 150°F. Temperature Control. A defective control will result in failure of the oven to operate properly at 150°F. in the 'Hold' cycle of the Cook & Hold mode. To check the control, place all controls in the operating position for Cook & Hold operation and set the 12-hour timer to '0' position. Leave left side door open. 4. Return all controls to the OFF positions. 1. Using an a-c voltmeter measure the voltage across control terminals 10 and 9. Meter should read 208 to 220 volts. If it does not, the problem lies in the input circuits. If it does, proceed with control test. 17-0406 4-10 Figure 4-1. Wiring Diagram.—208/240 Volt. Single & 3 Phase, 60 Hz 4-11 Figure 4-2. Wiring Diagram. 440/480 Volt, 3 Phase. 60Hz 4-12 Figure 4-3. Wiring Diagram. 220/380, 240/415 Volt, 3 Phase. 50 Hz, 4 Wire 4-13 Figure 4-4. Schematic Diagram — 208/240 Volt, 3 Phase, 60 Hz. 4-14 Figure 4-5. Schematic Diagram — 208/240 Volt 1 Phase, 60 Hz. 4-15 Figure 4-6. Schematic Diagram — 440/480 Volt, 3 Phase, 60 Hz. 4-16 Figure 4-7. Schematic Diagram — 220/380, 240/415 Volt, 3 Phase 50 Hz. SECTION 5 ILLUSTRATED PARTS LIST 5.1 GENERAL This section contains a listing of all replaceable parts of the Cook & Hold electrical controls for use with Power Saver II Convection Ovens. For replacement parts identification of other Power Saver II assemblies see service & parts manual #17-0393. For the purpose of parts identification, the control assemblies are shown in exploded views which are keyed to accompanying parts lists. Each parts list contains the figure index number, the Market Forge part number and an abbreviated description. Product Service Department Market Forge 35 Garvey Street Everett, Massachusetts 02149 Telephone: (617) 387-4100 Product Servi ce Department Market Forge Canada, Ltd. 1375 Aimco Boulevard, Unit 5 Mississauga. Ontario, Canada L4W 1 B5 Telephone : (416) 521-9252 All orders should contain the Market Forge part number(s), the part descnption(s), and the model and serial number of the cooker for which the part(s) is ordered. 5.2 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: 5.3 INDEX OF ILLUSTRATED PARTS LIST 5-1 Figure 5-1 Control Panel Assembly Page 5-2 5-2 Electrical Control Assembly 5-4 17-0406 COOK & HOLD POWER SAVER II 5-2 Figure 5-1. Control Panel Assembly. 17-0406 ILLUSTRATED PARTS LIST FIG. 5-1 INDEX NO. 1 2 3 3A 4 5 6 7 8 9 9A 10 11 12 12A 13 14 15 5-3 PART NO. 10-6415 10-6307 99-4565 99-4715 10-4714 10-6293 10-7903 09-6440 09-6439 09-6470 10-6669 10-7903 10-6280 10-6521 10-1979 10-6521 10-2332 DESCRIPTION Bezel, panel Knob, timer Legend Plate, control panel, 60 Hz Legend Plate, control panel, 50HZ only Thermostat Control Timer, 60-minute, 250V Toggle Switch, ON-OFF, 1 20/240 Volt Indicator Light, 250 Volt, red Indicator Light, 250 Volt, amber Timer, 12 hour, 250 Volt Timer, 5 hour, 250 Volt (substitute part #9 & 3) Indicator Light, 250 Volt, red Toggle Switch, ON-OFF, 1 20/240 Volt Circuit Breaker Mounting Plate, circuit breaker (not shown) Screw, flat head, #4-40 Mounting Plate, circuit breaker Nut, #8-32 COOK & HOLD POWER SAVER II 5-4 Figure 5-2. Electrical Control Assembly. 17-0406 ILLUSTRATED PARTS LIST Fig. 5-2 INDEX NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19A 19B 20 5-5 PART NO. 09-6472 10-1947 99-4612 10-1956 09-6430 10-2420 10-2337 10-2512 10-6665 10-1722 99-4589 10-1842 10-1761 09-6474 99-4588 09-6444 10-0265 10-5466 10-5467 09-6428 DESCRIPTION Temperature Sensor, 150°F. Control Screw, machine, rnd hd, #6-32 x 3/8" Ig. Clip, thermostat wires Screw, sheet metal, #8 x 3/8" Ig, phillip hd. Relay, SPST, 30 Amp, 240 Volt Rod, threaded, (Part of item #5 or #19) Washer, flat, #6 Nut, #6-32 Washer, internal tooth Buzzer, 208/240 Volt Screw, machine, #6-32 x 3/8" Ig, round head Bracket, 1 50°F. Temperature Control Screw, machine, round head, #8-32 x 7/8 Ig. Screw, machine, #8-32 x 3/8 " Ig, truss head Temperature Control, 150°F. Bracket, relay Relay, 3 PDT, 10 AMP, 240 Volt, (For 440/480 Volt service units only) Bushing, (Heyco #SB-750-9) Contactor, 30 Amp, 208 Volt Contactor, 30 Amp, 240 Volt Temperature Sensor, 'Hold' light