TECHNICAL MANUAL MODELS PS 310/360, PS360 MODEL PS200 PACESETTER OVENS PS200 ©1998 Middleby Marshall Co., Inc. Part No. 88210-0019 Price $30.00 R. 5/98, Rev.B,Ver.
W ARNING POST IN A PROMINENT LOCATION, INSTRUCTIONS TO BE FOLLOWED IN THE EVENT YOU SMELL GAS. Instructions to be followed in the event the user smells gas shall be obtained by consulting the local gas supplier. If the smell of gas is detected, immediately call the emergency phone number of your local Gas Company. They will have personnel and provisions available to correct the problem.
TABLE OF CONTENTS NOTE: The PS310 and PS360 ovens are very similar. For simplification and clarification purposes, all references in this manual to the PS310 also include the PS360 except where noted. Section PS310/360 Functional Operation I. Gas Oven Sequence of Operation A. Door Switch B. Closing the Door Switch C. Closing the Conveyor Switch D. Closing the Blower Switch E. Closing the Heat Switch F. Heat Switch Light II. Electric Oven Sequence of Operation A. Door Switch B. Closing the Power Relay C.
TABLE OF CONTENTS (continued) X. Pipe Sizing XI. Electrically Heated Oven - PS310/360 ONLY A. Ratings of Heating Elements B. Operation C. Checking the Heating Elements D. Changing Heating Elements XII. Electrically Heated Oven - PS200 ONLY A. Rating of Heating Elements B. Operation C. Checking the Heating Elements D. Changing Heating Elements XIII. Electrically Heated Oven -ALL MODELSMercury Contactor Replacement A. Replacing the Coil And/Or Contact Tube PS360 Electric Oven B.
SECTION 1 FUNCTIONAL OPERATION SECTION 1 FUNCTIONAL OPERATION NOTE: This section to be used in conjunction with the electrical wiring diagrams in Section 4. Complete description and troubleshooting of individual components are explained in Section 2. PS310/360 D. Closing the Blower Switch FUNCTIONAL OPERATION Closing the Blower Switch energizes: I. GAS OVEN SEQUENCE OF OPERATION 1. Two Cooling (axial fan) Motors. AIl gas heated ovens operate on 208/230 V, single phase. 2.
SECTION 1 FUNCTIONAL OPERATION During cooldown the Temperature Controller dial will continue to read oven temperature. If the Pilot does not light within approximately 90 seconds, the oven will shut down. All 310/314/360's have 100% lockout modules for oven shut down. NOTE: The red light on the Temperature Controller will stay ON at fire-up each day until the oven temperature goes above 180° F(82°C).
SECTION 1 FUNCTIONAL OPERATION D. Closing Blower Switch 5. When the Temperature Controller is calling for heat, another set of contacts from the Temperature Controller close and energize the green primary output light located in the upper left-hand comer of the Temperature Controller dial face. Closing Blower Switch energizes: 1. Two Cooling (axial fan) motors. 2. Blower Motor Contactors (C4 and C5). The High Limit Safety and the Cooldown features are located separately from the temperature controller.
SECTION 1 FUNCTIONAL OPERATION PS200 D. Closing the Blower Switch FUNCTIONAL OPERATION 1. Supplies power to one side of the Conveyor Switch. I. GAS OVEN SEQUENCE OF OPERATION 2. Energizes Blower Motor Contactor (C1). All gas heated ovens operate on 208/230 V, single phase. Energizing this contactor starts the Blower Motor. When the Blower Motor is up to speed an air pressure switch located in the control compartment senses the air pressure in the air plenum and closes a switch.
SECTION 1 FUNCTIONAL OPERATION If the Pilot does not light within approximately 90 seconds, the oven will shut down. All PS200's have 100% lockout modules for oven shut down. until the oven temperature falls to 180° F (82°C). During cooldown the Temperature Controller dial will continue to read oven temperature. The Pilot and Main Gas Valve will stay on (open) as long as the Heat Switch is ON and the flame is proven.
SECTION 1 FUNCTIONAL OPERATION D. Closing Blower Switch Closing Blower Switch energizes: 1. Supplies power to one side of Conveyor Switch. 2. Blower Motor Contactor. Closing this contactor starts the blower motor. When the Blower Motor is up to speed an Air Pressure Switch located inside the control compartment senses the air pressure in the air plenum and closes contacts. This completes the heat circuit. E. Closing the Heat Switch Closing the Heat Switch completes a circuit: 1. Through the Heat Switch. 2.
SECTION 2 SERVICING COMPONENTS SECTION 2 SERVICING COMPONENTS I. DIGITAL LOOP CONVEYOR CONTROL The Digital Loop Conveyor Control is used to set and monitor the speed of the conveyor. Included in the control is a Microcomputer connected to a thumbwheel switch and a Magnetic Pickup Wheel on the motor shaft. As the magnetic wheel attached to the motor shaft turns, the revolutions of the magnet are monitored by the Hall Device. The Hall Device is located next to, but not touching, the magnetic wheel.
SECTION 2 SERVICING COMPONENTS C. Pre-troubleshooting Checkout Procedure For Pacesetter Oven Digital Loop Conveyor Control 1. Before troubleshooting the digital loop conveyor control check the following: a. Conveyor belt tight. b. Drive chain tight and aligned. c. Drive sprockets tight (set screws). d. Axial fan running and clean (cooling). e. Motor and pickup wires on Conveyor Terminal Block are secure (see Figure 2), also wires on controller are secure. 2.
FIGURE 1 10A
SECTION 2 SERVICING COMPONENTS Figure 3. Pickup NOTE: Maximum Ambient Temperature 160° F. NOTE: 1. Maximum Ambient Temperature 160° F Figure 4.
SECTION 2 SERVICING COMPONENTS CAUTION! D. Controller/Motor Failure DO NOT turn conveyor switch on while Field Tester is connected. When the conveyor controller fails, it is very possible that a snorted conveyor motor caused the problem. Unless the motor is changed, the installation of another conveyor controller will simply result in burning up the new controller. On a PS310/360 remove the Red and Black motor lead wires from the terminal block (Figure 2) and attach motor leads to field tester.
SECTION 2 SERVICING COMPONENTS E.
SECTION 2 SERVICING COMPONENTS MOTOR WILL NOT RUN Is thumbwheel speed selector set to 0 minutes 0 seconds? Yes No Set speed to customer requirements All wiring between Motor and Speed Control in good condition Yes No Check for 120 Vac to Speed Controller Yes Is there DC voltage present across terminals ARM+ and ARM- on Speed Controller? No Yes Replace Microprocessor Still no DC output Complete the Motor Test Explained on Page 18 Motor Failed Motor checks out OK Motor still not running Replace Mo
SECTION 2 SERVICING COMPONENTS F. Troubleshooting Controller NOTE: When changing conveyor speeds it is advisable to first turn the Conveyor Switch OFF before adjusting the thumbwheel switch. Step 1 - Check all connections at terminal board to ensure connections are correct and tight. Connections are as follows: with the voltages shown on the chart below. If the voltage reading is more than ±5Vdc of that shown on chart, complete motor test shown on Page 18.
SECTION 2 SERVICING COMPONENTS We recommend you do your test at the 3, 6, and 10 minute thumbwheel settings before using the following Troubleshooting Chart. G. Conveyor Control Check Using A Frequency Counter PS200 The following procedures are to be used ONLY if you have a Frequency Counter feature on your Digital Multimeter. If no Frequency Counter is available, disregard this test procedure and go to Conveyor Controller Pickup Test on the following page.
SECTION 2 SERVICING COMPONENTS 1. Visually check pickup for the following: • Magnet clean and bearing in good condition. • Chips or cracks on the magnet. • Old style pickup (not encased in blue plastic housing) has a 1/64 to 1/32 gap between magnet and hall device. 2. Set voltmeter on Volts DC scale then connect meter probes as shown. Black (- corn.) probe to COM terminal on speed control board and Red (+VQ) probe to +5V terminal of speed control.
SECTION 2 SERVICING COMPONENTS I. Conveyor Motor Test 1. Disconnect motor wires from Speed Controller terminals - ARM and + ARM. 2. Remove brush retainer caps. DO NOT remove the brushes. 3. Using an Ohm Meter (set to lowest scale) place one meter lead on each brush retaining plate Make sure neither meter probe touches motor case. 4. Using a 5/16" open end wrench on the motor pickup shaft, very slowly rotate the shaft while observing the Ohm Meter.
SECTION 2 SERVICING COMPONENTS The permanent fix is to replace the pickup wiring between the controller and terminal block (located in left end motor compartment) with a shielded cable MM/PN 42400-0334. When installing the shielded cable follow the color code change shown below: J. Magnetic Pickup Replacement When replacing magnetic pickup apply LOCTITE REMOVABLE #242 sparingly on threads, turn mounting screw until finger tight, then 1/4 turn more with a wrench.
PS360 and PS570 conveyor sensor wiring changes 10/3/95 TRM
Bulletin No. MM-133B Date 04/07/95 Middleby Cooking Systems Group 1400 Toastmaster Drive • Elgin, Illinois 60120 (708)741-3300 • Service & Parts (708) 741-4406 Service Bulletin Subject Installation and Diagnostic Instructions DIP Switch Conveyor Control Assembly Part Number 42810-0133 Application This service bulletin describes the original DIP switch conveyor control.
Features Continued 5. 6. Both controls are protected against gear motor shorts. Both controls have metal housing covers that guard against handling damage and minimizes radio frequency interference (RFI). •Note: Control PN 28074-0018 REVISION B contains all current DIP switch settings currently used in the field. Prior to REV B. this control was not compatible with the 570 Series conveyor chain driven ovens.
DIP Switch Conveyor Control Installation and Diagnostic Instructions Part Number 88210-0077 General The following provides instructions for the Installation and Diagnostics of the DIP Switch Conveyor Control Part Number 28074-0018 or Part Number 31020 contained in kit Part Number 42810-0133. Either of these controls can be installed into the PS200, 300, and the 500 Series Ovens.
DIP SWITCH SETTINGS FOR BOTH CONTROLS Control PN 28074-0018 (REV. B) Standard Conveyor Speed Settings High Speed Option Conveyor Settings SWITCH SETTING MODEL(S) PS200 PS200SB PS200-20 PS224 PS200T PS360 PS310 PS350 PS360SB PS360T PS360WB PS570 PS570S PS360WB70 PS570-SB PS570S-SB OVEN TlMES(MlN/MAX) 2:40 M1N TO 29:50 MIN 2:40 MIN TO 29:50 M1N 1 x 0 2 0 x 3 x x OVEN TlME(MtN/MAX) SWTCH SETTING 1 2 3 4 40 SEC TO 10 MIN 1:30 MIN TO 10 MIN 0 x 0 x X x 0 X 1 MIN T010 MIN HIGH SPEED OPT.
B. Replacement Thumb Wheel Switch Installation 1. Disconnect the power to the conveyor control by turning the conveyor switch to the "off' (0) position and additionally by turning off the main power disconnect to the oven. 2. Remove the two screws that secure the failed switch body to the control door. Remove the switch body from the door. 3. Locate the ribbon cable connector that links the thumb wheel switch to the controller. Note the orientation of the cable for replacement.
Diagnostics With Control in Test Mode The control in this mode provides a fast and convenient method of troubleshooting the control. When running the diagnostic procedure the entire procedure must run or the control must be powered down and reset. There is no option to perform individual tests. 1. Turn the conveyor power switch off. 2. Set the thumbwheel switch to 00:00. 3. Open the control panel door. 4. Set the control DIP switch to test mode. 5.
D. Gear Motor/Sprocket Combinations The chart reference below lists the different motor sprocket combinations used with the DIP switch conveyor control system. MODEL & CHAMBER LENGTH PS200 40.5" PS220FS PS224 (Standard) PS200T 81" (Tandem) PS200 1 Min 40.5" (High Speed) PS200SB 40.5" (Split Belt) PS360 54.5" PS310 PS314 PS360SB PS360WB PS350 (Standard) PS360WB70 70" (Wide Body Stretch) PS360SS 54.
SECTION 2 SERVICING COMPONENTS II. TEMPERATURE CONTROLLER 1. General Description Dialapak instruments consist of two primary assemblies: the case and the plug-in chassis. The molded plastic case assembly houses the plug-in chassis and provides terminals for field wiring connections. A U-shaped bracket around the case allows the instrument to be panel mounted. The plug-in chassis consists of a front assembly and two printed circuit boards.
SECTION 2 SERVICING COMPONENTS f. Check that the meter is indicating the value of the process variable (oven temperature). g. High Limit and Cooldown Alarm g. Analog Set Point (see Figure 24). This circuit provides means to actuate external high and low alarm circuitry when the process deviates from the primary set point in either direction. It also provides local indication when an alarm state is in progress.
PS570S thermocouple wiring 11/6/95 TRM 26A
SECTION 2 SERVICING COMPONENTS B. Thermocouple (Type J) When two wires composed of dissimilar metals are joined together and one of the ends is heated, a continuous current flow is generated. We use an iron contant (Type J) thermocouple. The iron wire increases the number of dissimilar metal junctions in the circuit-If the thermocouple is open, the temperature controller will read very high, (full scale) on the temperature controller.
SECTION 2 SERVICING COMPONENTS 1. Thermocouple Installation Models PS310/360 Only Figure 25. Oven Thermocouple Installed Into Bake Chamber The thermocouple on the PS360 was mounted in two different locations over time. Earlier models had the thermocouple mounted through the machinery compartment behind the burner blower motor (see Figure 25). This would protrude the thermocouple into the bake chamber and read the return air going into the burner chamber.
SECTION 2 SERVICING COMPONENTS 2. Thermocouple Installation Model PS200 Only Figure 27 shows the insertion point for the thermocouple inside the control/machinery compartment. All thermocouples are shipped with a push nut at the back end of the 7" sheath. This push nut must be removed when installing thermocouples in a PS200. NOTE: On electrically heated ovens a dual lead thermocouple is used. One lead connects to the Temperature Controller and the other lead to the separate high limit/cooldown device.
SECTION 2 SERVICING COMPONENTS Figure 29. Electric Oven High Limit/CooIdown Device (Shown in PS200) C. High Limit/CooIdown Switch 650° F. (343° C.) the red LED, located in the upper right corner of gas oven Temperature Controller face, will be lit. This red LED will also remain on at startup until the oven climbs above 180° F. (82° C.). Both the High Limit and Cooldown Switches are incorporated into the secondary P.C. board of the Temperature Controller on gas ovens.
D. Troubleshooting Limit Switches An intermittent High Limit Switch will cause intermittent operation of the burner. If you suspect an intermittent opening of this Switch a good check is to place a 1 amp fuse in parallel around the Switch contacts (see Figure 30). if the Switch is trying to open intermittently the full current load of the Blowers will be carried by the fuse. Since this load will be much greater than 1 amp the fuse will blow. This would be an indication of a bad Switch.
Digital Temperature Controller (P/N 28071-0028) Installation, Programming and Troubleshooting Instructions Middleby Marshall inc. • •i400 Toastmaster Dr. • Elgin, IL 60120 • (708) 7^-33CO • FAX (708) 741-4406 Middlebv Corporation 24 Hour Service Hotline 1-800-238-8444 31B Part No.
Mechanical Installation 1.04. The following provides mechanical installation instructions for the Digital Temperature Controller CAUTION Before installing the Digital Temperature Con troller, shut OFF all electrical powerto the oven at the disconnect switch or circuit breaker. To remove the Analog Temperature Controller and install the Digital Temperature Controller, proceed as follows: Step Procedure 1.
Electrical Connections 1.05 All electrical connections on the Digital Temperature Controller are made on two terminal strips located on the rear of the unit. The existing oven wires are connected to the new terminal positions indicated in the wiring diagrams. Proceed as follows to make electrical connections: 1. Refer to the Data Plate on the oven for the oven Model Number and Operating Voltage. 2. Identify oven Model/Voltage in Table 1 and use related Wiring Diagram (Figures 2,3,4, or 5). 3.
NOTE When removing the 28071-QC27 Digital Temperature Controller (blue colored unit) and replacing it with the 28071 -0028 Digital Temperature Controller (gray colored unit), the electrical connections remain She same.
NOTE When removing the 28071-0027 Digital Temperature Controller (blue colored unit) and replacing it with the 28071 -0028 Digital Temperature Controller (gray colored unit), the electrical connections remain the same. Figure 4 - Wiring Diagram Showing Electrical Connections (Refer to Tab iel) * Add ground wire (green) from terminal G to a good ground connection in the control box.
Timing Out From SET UP Mode When in the SET UP Mode and no keys are pressed for a period o? 50 seconds, the controller times out and reverts to the normal display (SET PT or TEMP). Timing Out From Lower Display The normal display (SET PT or TEMP) is automatically shown if the DISP key is not pressed for 60 seconds. 3. DISPLAYING And PROGRAMMING THE SET UP GROUPS 3.01 Displaying and Programming is the process of accessing the Set Up Groups, viewing/making selections and returning to normal display.
31H
Diagnostic Error Messages 4.03 The controller runs background tests during normal operation. If a problem with the background ti occurs, an error message is shown (flashing) in the Lower Display. In case of more than one simultaneous malfunction, only the error message with the highest priority appears in the Lower Display, these are called Diagnostic Error Messages (Table 3). Table 3 - Diagnostic Error Messages Corrective Lower Display Action EFAIL FAILSF 1. Replace Controller 1.
A list of symptoms in Table 4 Troubleshooting Chart indicates controller failure or poor operation. Check the indicator and display reactions and use the information contained in the troubleshooting chart during troubleshooting. CAUTION Do not attempt to repair the controller as there are no user replaceable parts Inside the unit. When Corrective Action in Table 4 has been taken and the problem does not dear, then replace the Digital Temperature Controller.
Table 4 - Troubleshooting Chart (Continued) Symptom Cause Corrective Action Turn power OFF, then ON to see if Upper Display: Lower Display: FAIL RAMTST RAM failure. Upper Display: Lower Display: FAIL CFGTST Configuration data in the Step through the STATUS tests controller is (RAMTST, CFGTST, in error. CALTST, and FACTST) to allow the controller to error clears. clear the problem, then see if the problem clears Check all displays for programming accuracy.
31L
Digital Temperature Controller software version 4.
Bulletin No. MM-13 6 Date 9/28/93 Middieby Cooking Systems Group 1400 Toastmaster Drive • Elgin, Illinois 6012C (708) 741-3300 • Sen/ice & Parts (708) 741-4406 Service Bulletin SUBJECT: Digital Temperature Controller PN28071-0027 (Blue) or 28071-0028 (Gray) GENERAL In some oven installations electrical noise/static have caused the Digital Temperature Controller not to function property. Some common symptoms are: 1. The Controller Display changes and/or may flash frequently. 2.
• Effective September 20. 1993 ovens shipped with the Digital Temperature Controller include the Filter Capacitor assembly (installed). • Effective October 1, 1993 Middleby Marshall will fill all Orders for the Filter Capacitor Assembly. DISPOSITION OF INVENTORY All distributor inventory should be upgraded with the filter capacitor assembly. INSTALLATION PROCEDURES To Install the Filter Capacitor Assembly (PN 27170-0283), proceed as follows: 1. Turn "OFF* all power to the oven. 2.
SECTION 2 SERVICING COMPONENTS III. Figure 39. PS310/360 Motor Centrifugal Switch on Rear of Motor (MM P/N 27170-0144) MOTOR CENTRIFUGAL SAFETY SWITCH PS310/360 ONLY (See Figure 39) A normally closed limit switch is mounted inside each blower motor. When the motor is not running the centrifugal switch weight holds the switch open. As the motor reaches full RPM the weight moves away from the switch permitting the switch contacts to close. These switches are located in the rear of the motors.
SECTION 2 SERVICING COMPONENTS V. GAS BURNER AND TRAIN B. Intermittent Ignition Device NOTE: The PS200/PS310/PS360 all use the identical burner, burner controls and high flame valve. The only difference is the main burner orifice. All Pacesetter PS200/PS310/PS360 gas ovens are equipped with an intermittent ignition device (1ID) type automatic ignition pilot burner assembly.
SECTION 2 SERVICING COMPONENTS C. Gas Burner Components 1. Burner 110 Volt Power Supply - The burner main power supply is connected to terminals L1 and L2 located in the electrical junction box to the right side of the burner. burner. This safety circuit must be completed before the main burner will light. The ignitor sensor probe located on the pilot assembly is used to prove the presence of the pilot flame.
SECTION 2 SERVICING COMPONENTS Pilot Shield The pilot shield located on the bottom of pilot is used to prevent drafts, etc. from blowing the pilot flame away from the sensing probe. Burner Flame Target The burner venturi flame target is installed on all Model PS310/360's after 6/87. It is also installed on all PS360S, PS360Q and all PS200. The target aids in distributing the flame in the burner chamber.
SECTION 2 SERVICING COMPONENTS Pilot and Proof of Pilot Flame Rectification Detailed Explanation. Flame Rectification With flame rectification, the flame and probes are used in a similar manner. There is one important difference. The area of one probe that is exposed to the flame must be greater than area of the other probe that is exposed to the flame. Sensing Methods With standing pilots, heat is a necessary ingredient for proper thermocouple operation.
SECTION 2 SERVICING COMPONENTS Figure 45. Flame Rectification Pilot And Probe To apply this principle to an IID, a pilot and flame Maximum inlet pressure for natural gas applications sensor have been substituted for the two probes (See should be limited to 10.5" W.C. On LP applications, the Figure 45). After the pilot is ignited, a DC current flow inlet pressure should be limited to a maximum of 14of 1.5 micro-amps or more is conducted through the W.C.
Service Bulletin NO. 128 Date 7/22/91 A MIDDLEBY COMPAHY SUBJECT : Burner Pilot/Ignitor Assembly P/H 27363-0001 Replaced by P/N 42810-0117 (Kit) The burner pilot/ignitor assembly, P/N 27363-0001 has been discontinued and replaced by P/N 42810-0117 Pilot/Ignitor Kit. The kit contents are: Qty.
PILOT/IGNITOR REPLACEMENT INSTRUCTIONS USING KIT #42810-0117 IMPORTANT: When using Kit #42810-0117 the old style pilot/ignitor bracket must be replaced with the new style bracket contained in the kit or the burner will not light.
Bulletin No. MM-1 37 Date 03/21/94 Middleby Cooking Systems Group 1400 Toastmaster Drive • Elgin, Illinois 60120 (708) 7413300 • Service & Parts (708) 741-4406 SUBJECT: Pilot Line Tee Kit (PN 30185) GENERAL: The Pilot Outage Situation In the past all Middleby Marshall conveyor ovens were equipped with a combination gas valve with a spring loaded on/off knob which was tan in color. We found that when this tan knob material was exposed to heat it was more vulnerable to attack by air born animal proteins.
servo bounces up and down as it hunts for the proper level. This can be seen on a water column gauge connected to the output side of the vaive. This bouncing line pressure causes pressure surges in the pilot line too. These surges lift the pilot oft the sensor probe causing the problems described above. We have found that a properly regulated pilot line will smooth out the surges and create a strong piiot not effected by the vaive operation.
opportunity for you to display a preventive strategy to your customers and come out the hero. it also gives you an opportunity to promote the value of using factory trained Authorized Service Representatives who use only Genuine Factory Authorized Parts.
procedures. Middleby Marshall will issue credit for pans and the portion of the labor time related to the kit installation, valve installation, and pilot pressure adjustment. Middleby Marshall expects the Pilot Tee Kit (PN 30185) and the Combination Gas Valve Kit (PN 42810-0121) to be mandatory truck stock- Therefore, we will not pay for second trips.
INSTALLATION INSTRUCTIONS PILOT TEE ON PACESETTER OVENS KITP/N30185 Kit Contains: Branch Tee Branch Plug Installation Instructions P/N P/N P/N 30001 30002 30184 Tools Required: Middleby Marshall Technical Manual (PN 88210-0019) DC Micro-amp Meter Water Column Gauge (do not use a dial type meter) Aluminum Tube Cutter Soap Solution For Gas Leak Test Standard Tools of the Trade (open end wrench set, screw driver set, etc.) Middleby Marshall Inc.
INSTALLATION INSTRUCTION PILOT TEE K1TP/N30185 A. INSTALLATION OF TEE AND PLUG KIT P/N 30185 IMPORTANT: BEFORE ATTEMPTING TO INSTALL THIS KIT, READ THESE INSTRUCTIONS THOROUGHLY. TURN OFF GAS AND MAIN POWER TO OVEN BEFORE INSTALLING THIS KIT. 1. Remove pilot line tubing from between the combination gas valve and the burner plate. Refer to Figure 1. 2. Cut the tubing for installation of the tee as shown in Figure 1. Cut a 3/4" piece out of the pilot line tubing to insert the tee as shown in Figure 1.
Figure 1 42I
C. PILOT LIGHT CHECK 1. Cycle oven back onto high flame and check burner flame for proper color. Natural gas appears soft blue with orange tips and propane gas appears orange. The shutter plate on the burner blower motor is typically set at: PS200 Series =1/16" to 3/32" PS300 Series = 1/8" to 3/16" PS500 Series = 1/8" to 1/4" Each installation can vary. Adjust the shutter plate until the flame color is correct. Also check for proper microamp readings. Refer to Technical Manual (P/N 88210-0019), Section 2.
SECTION 2 SERVICING COMPONENTS 43
SECTION 2 SERVICING COMPONENTS 44
SECTION 2 SERVICING COMPONENTS Other conditions that can cause the failure of the main burner to come on or rapid chattering of the main burner are: 1. pilot flame is too small or, applied to the coil of the relay, the contacts will dose and permit 110 volts to go to the burner blower motor. This 15-30 second delay is a prepurge for a cold start. When the coil of the relay is warm, this delay is bypassed. 2. gas pressure is too low for proper pilot flame impingement on the flame sensor. D.
SECTION 2 SERVICING COMPONENTS bb. Spark cuts off when pilot flame is established. cc. Main gas valve opens and main burner lights after gas reaches the burner ports. A reading of 1.5 microamps or greater should be obtained. If a poor reading is obtained, pilot flame and sensor are probably not making good contact. This will keep the main valve from opening. Refer to the section on flame rectification.
SECTION 2 SERVICING COMPONENTS 4. System Troubleshooting. Referto next page 3. Control Module Flame Sensor Circuit Test Start the system by setting the temperature controller above room temperature, and observe the system response. The control module provides AC power to the ignitor/sensor which the pilot burner flame rectifies to direct current. If the flame signal back to the control module is not at least 1.5 uA DC, the system will lock out.
SECTION 2 SERVICING COMPONENTS IMPORTANT: When servicing the Burner Control Board it is very important that you identify the Control Board as either a fused or a nonfused. The original board supplied by the vendor for the past few years was the fused model. We are now supplied with the nonfused mode. All PS200 ovens have the nonfused model. Refer to the chart below when servicing the Burner Control or the Gas Safety Valve.
Service Bulletin NO. 123A Date 11/30/90 A MIDDLEBY COMPAHY SUBJECT: HONEYWELL IGNITION MODULE All Pacesetter Ovens We spoke "too soon. There is a difference between the current Honeywell ignition module (P/N 27161-0004) and the new Honeywell ignition module (P/N 27161-0005; Kit P/N 42810-0114), introduced to you in Service Bulletin 123. The new module is internally grounded and as a result must not be in the ground leg of the 24 volt transformer.
INSTALLATION INFORMATION (P/N 88210-0058) NEW HONEYWELL IGNITION MODULE (P/N 27161-0005) OLD HONEYWELL IGNITION MODULE (P/N 27161-0004) REPLACING OLD MODULE WITH NEW 1. WHEN REPLACING AN OLD MODULE WITH A NEW MODULE IT IS MANDATORY TO REMOVE AND DISCARD THE BURNER TRANSFORMER GROUND WIRE. SEE FIGURE 1. This ground wire is located inside the burner/blover motor electrical box containing the 24 volt transformer and prepurge relay.
48C
SECTION 2 SERVICING COMPONENTS
SECTION 2 SERVICING COMPONENTS b. Disconnect the ignition cable at the control board stud terminal to isolate the circuit from the pilot burner/ignitor sensor, and prepare a short jumper lead using heavily insulated wire, such as ignition cable. 5. Component Checks Reset System After Lock out. c. Energize the control board and touch one end of the jumper firmly to the control board ground terminal (GND). Do not disconnect the existing ground lead.
SECTION 2 SERVICING COMPONENTS 7. Check Spark Ignitor. c. Check connections to ignitor and control module stud, connections must be clean and tight. Loose connections may not conduct a flame current even though the ignition spark is satisfactory. Check the electrical continuity of the cable. Replace cable if damaged or deteriorated.
SECTION 2 SERVICING COMPONENTS F. Checkout Procedures.
SECTION 2 SERVICING COMPONENTS SPARK IS PRESENT, PILOT WILL NOT LIGHT 53
SECTION 2 SERVICING COMPONENTS 54
SECTION 2 SERVICING COMPONENTS VI. HIGH FLAME SOLENOID VALVE proved, 25Vac is applied to terminal TH-TR and TH, energizing the Servo Valve Operator. The main valve is Servo operated. Gas pressure from the inlet side of valve is passed through the Pressure Regulator which then supplies this regulated pressure to a cavity below the main valve diaphragm. This pressure overcomes the spring force and moves the main valve to its open position.
SECTION 2 SERVICING COMPONENTS VIII. LOW FLAME ORIFICE On PS360 ovens with the thermocouple located in the rear of oven and all PS200 ovens the ratio of low flame to high flame will be closerto 1 to 1. All ovens are equipped with an orifice in the low flame gas line (See Figures 46 or 47). The purpose of this orifice is to maintain a very low flame when the oven is not calling for heat.
Service Bulletin No. 131 Date 11/27/91 A MIDDLEBY COMPANY SUBJECT: INTERMITTENT PILOT COMBINATION GAS CONTROL KIT PART NUMBER 42810-0121 The gas control kit, P/N 42810-0121, described in this bulletin is a direct replacement for gas control P/N 28092-0013 which has been discontinued. The new gas control kit consists of four (4) parts: 1. 2. 3. 4.
Middleby Marshall Inc. ·8300 Austin Ave. ·Morton Grove, IL 60053·(708)966-8300·TWX9102330211·FAX (708)966-8701 Intermittent Pilot Combination Gas Control Kit (Kit Number 42810-0121) Installation Instructions WARNING FIRE OR EXPLOSION HAZARD CAN CAUSE PROPERTY DAMAGE, SEVERE INJURY OR DEATH. Do Not attempt to use a gas control set for natural gas on propane gas or a gas control set for propane gas on natural gas IMPORTANT These gas controls are shipped with protective seals over Inlet and outlet tapping.
56E
SECTION 2 SERVICING COMPONENTS Equivalent Orifice Sizes at High Altitudes (Includes 4% Input Reduction for Each 1,000 Feet) Orifice Size at Sea Level Orifice Size Required at Other Elevations 2000 3000 4000 5000 6000 7000 8000 9000 10000 1 2 2 3 3 4 5 7 8 10 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 3 4 6 7 8 9 10 11 12 13 13 15 16 16 17 18 19 20 22 23 23 25 25 26 27 28 29 29 30 32 33 35 35 36 37 38 39
SECTION 2 SERVICING COMPONENTS Equivalent Orifice Sizes at High Altitudes (Includes 4% Input Reduction for Each 1,000 Feet) Orifice Size at Sea Level 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 Orifice Size Required at Other Elevations 2000 3000 4000 5000 6000 7000 8000 9000 10000 48 49 50 51 51 52 54 54 55 56 58 59 60 61 62 63 64 65 65 67 68 68 70 70 72 73 73 74 75 76 77 78 79 80 48 49 50 51 52 53 54 55 55 56 59 60 61 61 62 63 64 65 66 6
SECTION 2 SERVICING COMPONENTS NOTE: Propane ovens shipped from the factory will have the old natural gas orifice enclosed in a plastic container. This is in the event that the oven may have to be converted back to natural gas at some future date. If an oven is field convened from natural to propane please leave the old natural gas orifices in a propane container inside the machinery compartment of the oven. Refer to Figure 46 or 47 for the location of the low flame, main burner and pilot orifice. IX.
SECTION 2 SERVICING COMPONENTS 2. Attach Natural gas pressure regulator (MM P/N 28092-0016) as shown in Figure 52. DO NOT use old gasket, a new gasket is supplied with kit. A. Converting Gas Valve from Natural to Propane Gas. CAUTION: Turn OFF gas at manual shutoff valve on incoming gas line before attempting to loosen any gas fitting on the oven. Also shut OFF main electrical breaker for oven. 3. Attach gas pressure manometer to inlet and outlet pressure taps of the gas valve. 4.
Bulletin No. 13 2 A Date: 12/19/94 Middleby Cooking Systems Group 1400 Toastmaster Drive • Elgin, Illinois 60120 (708)741-3300 • Service & Parts (708) 741-4406 Service Bulletin SUBJECT: PS360WB GAS CONVERSION KIT GENERAL: This bulletin is issued to alert the service technician that the PS360WB can be converted from natural to propane, or from propane to natural as is possible with any other Middleby Marshall gas fired conveyorized oven.
Middleby Marshall Inc, • 8300 Austin Ave, •Morton Grove, IL 60063 • (708)966-8300 • 1-800-238-M44 • FAX(708)966-8701 Oven Gas Conversion KitNatural Gas to Propane Gas Installation Instructions IMPORTANT KITS LISTED BELOW ARE FOR USE WITH OVENS EQUIPPED WITH OAS CONTROL VALVE MM/PN 28092-0017 ONLY! PS200 Kit ...............................................MM/PN 42810.0122 PS200-20 Kit........................................…MM/PN 428104123 PS300 Series (except P8333) Kit ....….....
CAUTION Turn Off The Electrical Power Supply To The Oven Before Performing Any Service Or Conversion Work CAUTION Turn Off The Gas Supply At The Service Valve Behind The Oven Before Performing Any Service Or Conversion Work MANIFOLD AND VENTURI REMOVAL 1. Turn off the electric power supply to the oven. 2. Turn off the gas supply at the service valve behind the oven. 3. Unscrew the gas pipe union located on the Inlet side of the gas control, Refer to Figure 1. 4.
MARKING AND LABELING 1. Print the word 'PROPANE" In the space provided on the Gas Control Conversion Tag P/N 25501.0007. 2. Affix the Gas Control Conversion Tag on the gas control. 3. Affix the round, orange, propane label Part Number 22500-0065 over ( TIB round, green natural label on the burner (unction box cover. 4. Pill In the appropriate Information on me oven conversion label P/N 22500-0123 according to the Instructions In Figure 0. 5.
MANIFOLD REINSTALLATION 1. Verify the pilot ignitor/main burner venturi relationship using Figure 5. 2. Insert the venturt assembly Into the burner tube. 3. Fasten the four venturi mounting plate screws. Refer to Figure 1. 4. Fasten the gas pipe union. Refer to Figure 1. 5. Turn on the electrical power supply to the oven. 6. Turn on the gas supply at the service valve behind the oven.
SECTION 2 SERVICING COMPONENTS X. PIPE SIZING - Always install a shutoff valve in the gas supply line to the oven (supplied with PS200 ovens). This valve should be the same size as the supply line and should have a full minimum 3/4" throat opening.. RECOMMENDED SUPPLY PIPE SIZE FOR NATURAL GAS OVENS AT 6" W.C. INCOMING PRESSURE.
SECTION2 SEVICING COMPONENTS Figure 54.
SECTION 2 SERVICING COMPONENTS XI. ELECTRICALLY HEATED OVEN PS310/360 Only The control current of the oven operates at 110V single phase. NOTE: AH control wire used on this oven is AWM rated at 105°C. DO NOT replace with lower rated wire. If the oven was specified for a 3 wire system it was supplied with an extra cost optional control transformer to step the 3 phase current down to 110V, single phase for the control circuit. All electrically heated Pacesetter Ovens are 3 phase, 208,230 or 240 VAC.
SECTION 2 SERVICING COMPONENTS if one or more elements in a bank are open this can be checked with an amprobe and ohmmeter. C. Model PS310/360 Only - Checking the Heating Elements (Refer to Figures 55, 56 and 57) Check the amp draw from the output of each contactor, See Figure 55. This should be: The most common problem encountered with electric heaters is open or bad connections and open, shorted or grounded heating elements. 9.7ampsat415V±10% 11.2ampsat480V±10% 12.3ampsat380V±10% 19.
SECTION 2 SERVICING COMPONENTS Figure 56. PS310/360 - Checking for Open or Bad Connections (Note all wires disconnected from element). Figure 57. PS310/360 - Check for Grounds (Note all wires disconnected from element).
SECTION 2 SERVICING COMPONENTS D. Models PS310/360 Only - Changing Heating Elements (Refer to Figures 58, 59 and 60) 2. Remove the 9 electrical leads going to the element bank, See Figure 59. NOTE: Wires going from the contactor to the heating elements are rated at #12 gauge TAGT, 250° C. DO NOT under any circumstances, use a wire of lesser rating or quality. 3. Gently work the bank of elements out of the oven.
SECTION 2 SERVICING COMPONENTS Figure 59. PS310/360 - Electrical Leads Disconnected. Figure 60. PS310/360 - Element Bank Removed Showing Spacer Brackets on Left Side of Elements.
SECTION 2 SERVICING COMPONENTS XII. ELECTRICALLY HEATED OVEN PS200 ONLY. The control current of the oven operates at 110V, single phase. NOTE: All control wires used in this oven are rated at 105° C. Wires from contactors to heating elements are rated for 250° C. DO NOT replace with lower rated wire than stated above. If the oven was specified for a 3 wire system it was supplied with an extra cost optional control transformer to step the 3 phase current down to 110V, single phase for the control circuit.
SECTION 2 SERVICING COMPONENTS If one or more elements are open this can be checked with an amprobe and ohmmeter. C. Model PS200 Only - Checking the Heating Elements (Refer to Figures 61, 62, and 63). Check the amp draw of each wire at the fuse block. See Figure 61. This should be: The most common problem encountered with electric heaters is open or bad connections and open, shorted or grounded heating elements. A grounded or snorted element usually will blow the fuse.
SECTION 2 SERVICING COMPONENTS Figure 62. Checking PS200 for Open or Bad Connections (Note all wires disconnected from element). Figure 63. Check PS200 for Grounds (Note all wires disconnected from element).
SECTION 2 SERVICING COMPONENTS D. For Models PS200 Only - Changing Heating Elements (Refer to Figures 61, 62, and 63). NOTE: Wires going from the contactor to the heating elements are rated at #12 gauge TAGT, 250° C. DO NOT under any circumstances, use a wire of lesser rating or quality. NOTE: All lugs and connections are rated at 600° F. All heater element connections must be double nutted. To remove the elements follow these procedures: 3. Remove the 12 bolts holding the rear oven panel to oven body.
SECTION 2 SERVICING COMPONENTS Figure 65. PS200 Fan Shroud Removed Figure 66.
SECTION 2 SERVICING COMPONENTS XIII. ELECTRICALLY HEATED OVEN ALL MODELS MERCURY CONTACTOR REPLACEMENT. The advantage of using mercury contactors is their long life and quiet operation. Another benefit is each pole in the contactor is a separate mercury filled tube which is replaceable - the entire contactor should never have to be replaced in or out of warranty. Listed below are the two different mercury contactors.
SECTION 2 SERVICING COMPONENTS A. PS360 ELECTRIC OVEN INSTRUCTIONS FOR REPLACING THE COIL AND/OR CONTACT TUBE. 1. Remove the two Phillips head screws holding the cover, then remove cover. Figure 67 2. Remove the six terminal lug screws. This procedure must be followed when replacing the coil or any one contact tube. 3. The coil and contact tubes will now pull straight out from base. The coil or any individual contact tube can now be replaced.
SECTION 2 SERVICING COMPONENTS 4. Replace cover and attach with two phillips head screws. NOTE: The cover and base are marked to show proper side up. Figure 69 B. PS200 ELECTRIC OVEN INSTRUCTIONS FOR REPLACING THE COIL AND /OR CONTACT TUBE. 1. Remove the complete contactor from the oven then completely remove the terminal clamps from the contactor tube(s) to be replaced.
SECTION 2 SERVICING COMPONENTS 2. Locate the Tinnerman clips on bottom side of contactor which hold each individual contact tube in place. 3. Find the break in the tube bracket located in the center. Then using a diagonal cutter cut the Tinnerman clip, the clip will now be easily removed. Figure 71 4. Remove the contact tube. If the coil must be replaced all three contactor tubes must first be removed. 5. To replace the contactor tube(s) slide the tube (thin end) into the contactor bracket.
SECTION 2 SERVICING COMPONENTS 6. Support the wide end of tube between two pieces of wood so the terminal end will not be damaged.
SECTION 2 SERVICING COMPONENTS 7. Using a deep well socket over the new Tinnerman clip, gently tap the socket with a hammer to push the clip down into place. NOTE: When replacing the mercury contactor 'in the oven the wider tube ends must be up. The tubes must always be mounted in a vertical position.
SECTION 2 SERVICING COMPONENTS XIV. BLOWERS • PS310/360 ONLY Each oven is equipped with two blower motors operating at 1725 RPM on standard and super models, and 1140 RPM on all Q oven models. The blower wheel is directly connected to the blower motor shaft. A heat slinger is mounted on the motor shaft in the motor compartment. Purpose of the heat slinger is to keep heat away from the motor bearings. If the motor is stopped when the temperature in the oven is over 180° F.
SECTION 2 SERVICING COMPONENTS B. Direction of Blower Rotation PS310/360 ONLY Blower rotation is extremely important. Blower rotation is determined by viewing the motor and the blower wheel from the REAR of the motor. See Figure 78. REAR VIEW-NOTE SLANT OF BLADES (CLOCKWISE BLOWER) Figure 79. Determining Proper Blower Placement. To service the blower motor and blower wheel it is necessary to remove the conveyor ends and enter the oven from the ends.
SECTION 2 SERVICING COMPONENTS A. Blower Balancing All blower fans are prebaianced, any fan found to be out of balance must be replaced. XV. BLOWERS - PS200 ONLY Each oven is equipped witha 1/3 hp motor operating at 1725 RPM. The blower fan is indirectly connected to the motor by a fan belt. All blower motors are rated for 208-230/460V single phase and is protected by a builtin thermal overload protection device and two 9 amp fuses. Figure 81 identifies the two motor fuses.
SECTION SERVICING COMPONENTS B. Blower Rotation Blower rotation is extremely important. Blower rotation is determined by viewing the blower fan shaft pulley. From the REAR of the oven the pulley must be turning clockwise. Figure 82.
SECTION 2 SERVICING COMPONENTS C. Main Blower Fan Shaft Bearings Lubrication. Grease the two main blower fan shaft bearings using a special high temperature grease (MM P/ N 17110-0015) Lithium base high temperature grease). ONLY ONE PUMP of grease gun in each bearing is required. We recommend lubricating the bearings once every 3 months. Over greasing will damage bearing seals which will accelerate grease loss and shorten bearing life. Wipe off any excess grease on and around the bearing.
SECTION 2 SERVICING COMPONENTS E. PS 200 Fan Shaft Bearing Replacement and Alignment. IMPORTANT: The bearings (10) must be mounted so the grease fitting faces up when the bracket assembly (Item 5) is mounted on the rear wall. Refer to Figures 85 and 86. NOTE: Refer to Figures 83 thru 87. The following procedures are necessary to align the fan shaft whenever service to the fan shaft or fan shaft bearings is required. 1. Remove the entire back wall (Item 1) of oven to service the fan assembly.
PARTS LIST ITEM 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 QTY 1 8 16 20 1 1 1 1 1 2 6 6 1 4 1 PART# 37900-0068 21216-0001 21422-0001 21416-0001 49400-0043 37900-0011 35900-0081 22230-0072 21651-0008 22071-0010 21211-0004 21421-0016 27399-0003 21419-0004 37900-0094 86 DESCRIPTION Back Wall Ass'y Screw, Hex Cap SS 3/8-16x1" Lock Washer, Split 3/8" Flat Washer, SS 3/8" Indirect Fan Drive Bracket Ass'y Bracket, Indirect Drive Shaft, Fan Drive Pulley, 1/2" Bore Square Key 1/8 x 1/8 x 1 -1/2" Flange Bearing Screw,
Service Bulletin No. 121 Date 7/24/9 A MIDDLEBY COMPANY SUBJECT: PS200 Indirect Fan Drive Assembly All PS200 ovens manufactured after July 1, 1990, will be equipped with a new style indirect fan drive assembly consisting of larger 5/8" bore pillow block bearings and 5/8" diameter fan shaft. This is an improvement over the older style indirect fan drive assembly consisting of a 1/2" bore flange mount bearing and 1/2 - diameter fan shaft.
INSTALLATION INSTRUCTIONS NEW STYLE INDIRECT DRIVE BRACKET ASSEMBLY - PS200 The following procedures are necessary -to install and align -the new style drive bracket with 5/8" bore pillow block bearings and 5/8" diameter fan shaft - 1. Remove the entire back wall (Item 1) of oven to service the fan assembly. 2. Remove the blower fan (Item 11) and pulley (Item 7). 3. Remove the indirect drive bracket assembly (Item 5) by removing eight (8) screws (Item 2).
7. Insert fan shaft alignment tool (Item 13) as shown in Figure 85 into back wall. NOTE: The bracket assembly is designed for slight up and down and right to left movement to attain free shaft rotation when shaft alignment tool is in place. Once free shaft rotation is achieved, tighten all-eight bracket screws (Item 2). 8. Tighten rear pillow block bearing screws (Item 9) -then front pillow block bearing screws. 9. Remove shaft alignment tool and then recheck fan shaft for free rotation. 10.
86E
Figure 87 Four-point alignment test is a simple way to identify misalignment problems. Figure 88 Force and deflection measurements aid in determining belt tension. Figure 89 Proper tension produces a slight bow in the slack side of the belt.
PARTS LIST ITEM QTY.
FAN SHAFT SERVICE KIT QUANTITY 21 1 1 P/M 49810-0018 PART NUMBER DESCRIPTION 22072-0025 35900-0232 37900-0106 88910-0020 Bearing, pillow block 5/8" Shaft, fan drive Fan shaft alignment tool Instructions PAH SHAFT DRTVER ASSEMBLY UPGRADE P/N 49810-0021 2 22072-0025 Bearing 1 35900-0232 Shaft 1 1 37900-0106 37900-0101 Fan shaft tool Bracket, indirect drive 1 22230-0073 Pulley, 5/8" bore 1 4 21651-0010 21216-0001 Square key 1/8" Screw, hex cap, SS 3/8 - 16 X l" 4 21422-0001 Lock wash
SECTION 2 SERVICING COMPONENTS Figure 87 Fan Shaft Alignment Tool Installed (Item 15 in Figure 85) 87
SECTION 2 SERVICING COMPONENTS XVI. AIR DISTRIBUTION NOTE: Some pancake mixes come complete - all you add is water. Other mixes require the addition of milk, shortening, water and etc. Whichever type you purchase YOU MUST continue to use the same type of mix until all testing is complete. Proper air distribution inside the oven is attained by proper balancing of the air as it comes out of the fingers.
SECTION SERVICING COMPONENTS Figure 88. Test Doughs Exiting the Oven Showing an Uneven Bake.
SECTION 2 SERVICING COMPONENTS XVII. FINGER USAGE & IDENTIFICATION MODELS PS200, PS350, PS360, PS360S (Super), PS360Q (Quiet) and PS360T (Tandem) Finger arrangements must be correct for consistent product baking. Incorrect finger arrangements will cause inconsistent baking of product and will be a source of poor customer relations. This section explains and shows all types of fingers and the oven models they are used on.
SECTION 2 SERVICING COMPONENTS A. BASIC FINGER COMPONENTS EXPLANATION Finger Assemblies are made up of three parts as follows. 1. Outer Plate - The Outer Plate is the removable covering with tapered holes, which directs the air stream onto the product to be baked. 2. Inner Plate - The Inner Plate has a Factory Adjustable Shutter Plate on the Model PS 360 (Standard only). The Model PS 360S (Super) and PS 360Q (Quiet) have no adjustments. 3.
SECTION 2 SERVICING COMPONENTS Figure 91. Model PS 360S and Model PS360Q (Super Fingers) IMPORTANT: Contact the Middleby Marshall Technical Service Department if you need assistance in finding the date an oven was manufactured. Note 1: Dam shown in Figure 91 is on the inner plates of all PS 360S ovens. The dam is also on PS 360Q ovens manufactured before 3/18/88. PS 360Q ovens manufactured after 3/18/88 do not have the dam on the inner plate.
SECTION 2 SERVICING COMPONENTS B.
SECTION 2 SERVICING COMPONENTS C. FINGER LIST WITH PHOTOS AND EXPLANATIONS THE FOLLOWING PHOTO'S ARE OF THE FINGERS NOW IN USE IN OUR OVENS THIS INFORMATION WILL BE MOST VALUABLE IN THE IDENTIFICATION OF THE FINGERS. PS 200 FINGERS Figure 93 M6 Finger Assembly 35000-1365 Inner and Outer Plates with 6 rows of holes- Figure 94 M3 Finger Assembly 49400-0059 inner Plate with 6 rows of holes and Outer Plates with 3 rows of holes.
SECTION 2 SERVICING COMPONENTS PS 200 FINGERS continued Figure 95 FB Full Blank Plate 35900-0106 PS360 STANDARD FINGERS Figure 96 0 = Standard Finger Assembly 42400-0201 Inner and Outer Plates with 4 rows of holes. Inner Plate with factory adjusted Shutter Plate.
SECTION 2 SERVICING COMPONENTS PS360 STANDARD FINGERS continued Figure 97 R = Radiant Finger Assembly has full Inner Plate. 42400-0438 Outer Plate with 4 rows of holes. Inner Plate with no holes. Figure 98 C = Choke Finger Assembly 42400-0397 Same as radiant finger above but with a shorter Inner Plate than the radiant finger.
SECTION 2 SERVICING COMPONENTS PS360 STANDARD FINGERS continued Figure 99 B= Full Blank Plate 35531-0004 PS 360S FINGERS Figure 100 L6 = Super Finger Assembly 42400-0330 Inner and Outer Plates with 6 rows of holes. Inner Plate has a dam.
COMPONENTS PS 360S FINGERS continued Figure 101 L3 = Super Finger Assembly 42400-0331 Inner Plate with 6 rows of holes and dam. Outer Plate with 3 rows of holes. Figure 102 L1= Super Finger Assembly 42400-0448 Inner Plate with 6 rows of holes and dam. Outer Plate with one row of holes.
SECTION 2 SERVICING COMPONENTS PS 360S FINGERS continued Figure 103 R = Radiant Super Finger Assembly 42400-0333 No Inner Plate. Outer Plate with no holes. NOTE: In some radiant fingers baffle has been removed.
COMPONENTS PS 360S FINGERS continued Figure 105 HB= Half Blank Plate 35000-1369 PS 360Q FINGERS Figure 106 L6 = Q Super Finger Assembly 42400-0480 Inner and Outer Plates with 6 rows of holes.
SECTION 2 SERVICING COMPONENTS PS 360Q FINGERS continued Figure 107 L3A = Q Super Finger Assembly 42400-0481 Inner Plate with 6 rows of holes. Outer plate with 3 rows of holes and 3 extra holes near front of finger. Figure 108 L1 = Q Super Finger Assembly 42400-0482 Inner Plate with 6 rows of holes. Outer Plate with one row of holes.
SECTION 2 SERVICING COMPONENTS PS 360Q FINGERS continued Figure 109 FB= Full Blank Plate 35531-0004 Figure 110 HB= Half Blank Plate 35000-1369 102
SECTION 2 SERVICING COMPONENTS D. Model 360 Standard (Shutter) Finger Adjustment Before attempting to properly balance a Middleby Marshall oven equipped with shutter fingers you should understand the principles of operation of this type of finger. The oven moves approximately 2000 Cubic feet of air per minute (C.F.M.). When this large amount of air is moved through the plenum and fingers it rushes through the plenum and to the end of the fingers.
SECTION 2 SERVICING COMPONENTS Figure 112. Inverted View of Upper Shutter Finger Air Flow.
SECTION 2 SERVICING COMPONENTS 1. Adjustment Procedure. a. Remove all top fingers from the oven. NOTE: As the Jet air fingers are removed use a felt pen to mark all parts of the fingers. This includes the finger manifold-housing, inner shutter plate and the outer plate. If a blank or choke plate is used. mark that plate also. Fingers are marked in the order shown below; as viewed from the front of the oven. (The marks for the Upper oven should be preceded with a "U", example UB1, UB2, etc.
SECTION 3 TROUBLESHOOTING SECTION 3 TROUBLESHOOTING MODELS PS310/360 TROUBLESHOOTING This section is to be used as an aid in finding the general source of a problem. After locating the general source, you may have to refer to the section in this manual that describes the particular component that is causing the problem, for a more detailed explanation. 2. Check for 208-240 VAC at motor. If no vottage see "1". If voltage present and motor will not turn, replace motor.
SECTION 3 TROUBLESHOOTING 1. If white hand on controller does not move steadily upward but jumps, check to see thermocouple is secure and wires are tight. If this checks OK then replace controller. 2. If both blowers are not running, refer to "Section 1". B. Turn Heat Switch to "ON" Position -the following things should happen. (If temperature controller set point is set higher than the oven chamber temperature. Suggested minimum setting is 450° F.) 2.
SECTION 3 TROUBLESHOOTING V. HEAT (ELECTRIC OVEN) 2. CAUTION: If after you jumper terminals 15 and 16 the contactors operate replace the secondary board of the temperature controller as soon as possible, a safety devise has been bypassed and the oven may not be safely operated for any extended period of time. A. Turn Blower Switch to "ON" Position. 1. Both blowers must be running and up to speed. This can be checked by feeling the air flow out of the air fingers.
SECTION 3 TROUBLESHOOTING MODEL PS200 TROUBLESHOOTING 3. Check for loose wire on the back of conveyor switch. This section is to be used as an aid in finding the general source of a problem. After locating the general source, you may have to refer to the section in this manual that describes the particular component that is causing the problem, for a more detailed explanation. 4. Check for 110-120 VAC on input wire terminals of controller, if no voltage, then recheck Steps 1 and 3. 5.
SECTION 3 TROUBLESHOOTING 2. CAUTION: If after you jumper terminals 15 and 16 the burner operates replace the secondary board of the temperature controller as soon as possible, a safety device has been bypassed and the oven may not be safely operated for any extended period of time. IV. TRIAL FOR FLAME Turn on heat switch. Reset after each trial. A. No Flame 3. Is there 110 VAC across burner motor leads, if not, check the motor relay or 24 VAC transformer. 1. Check gas pressure. 2.
SECTION 3 TROUBLESHOOTING D. If Heat Switch Light is ON but Contactors Will Not Come ON Check the following: E. If Green Light on Temperature Controller is ON and There is 110 VAC at Terminal 6 on Controller, all Three Heater Contactors Should be Energized if Not Check for Defective Contactor or Loose Wire. 1. Check for 110 VAC across the high limit switch, terminals 15 and 16 on the temperature controller. If the switch will not close with the oven on jumper terminals 15 and 16.
ELECTRICAL SECTION 4 ELECTRICAL SCHEMATICS DESCRIPTION PS 310/360 Schematics Gas Oven Schematic, 208-240V, 50/60Hz,1 Ph,3W Gas Oven Schematic, 208-240V, 50/60Hz,1 Ph,2W,Export Only Gas Oven Schematic, 190-380 V, 50/60Hz,1 Ph,2W,Export Only Electric Oven Schematic, 200-220V, 50/60Hz,3Ph,3W,Expon Only Electric Oven Schematic, 208-240V, 50/60Hz, 3Ph, 4W with Single Phase Blower Motor Electric Oven Schematic, 208-240V,50/60Hz,3Ph,4W with 3 Phase Blower Motor Electric Oven Schematic, 240V, 50/60Hz, 3Ph, 3W Ele
SECTION 4 ELECTRICAL
114A
SECTION 4 ELECTRICAL 115
ELECTRICAL 116
SECTION 4 ELECTRICAL 117
118
SE EL 119
120
SECTION 4 ELECTRICAL 121
ELECTRICAL 122
ELECTRICAL 123
124 SECTION 4 ELECTRICAL
124A
125
ELECTRICAL 126
SECTION 4 ELECTRICAL 127
SECTION 4 ELECTRICAL 128
ELECTRICAL 129
SECTION 4 ELECTRICAL 130
APPENDIX FRACTIONAL INCHES TO DECIMAL AND MILLIMETER EQUIVALENTS INCH DECIMAL EQUIVALENT FRACTION 1/64 .015625 1/32 .03125 3/64 .046875 1/16 .0625 5/64 .078125 3/32 .09375 7/64 .109375 1/8 .125 9/64 .140625 5/32 .15625 11/64 .171875 3/16 .1875 13/64 .203125 7/32 .21875 15/64 .234375 1/4 .25 17/64 .265625 9/32 .28125 19/64 .296875 5/16 .3125 21/64 .328125 11/32 .34375 23/64 .359375 3/8 .375 25/64 .390625 13/32 .40625 27/64 .421875 7/16 .4375 29/64 .453125 15/32 .46875 31/64 .484375 1/2 .
APPENDIX APPENDIX CONVERSION FACTORS MULTIPLY Atmospheres (StdJ 760 MM of Mercury at 32°F Atmospheres Atmospheres Atmospheres Atmospheres Atmospheres Atmospheres Brit Therm. Units Brit. Therm. Units Brit. Therm. Units Brit. Therm. Units BTU/min. BTU/min BTU/min BTU/min Calorie Centimeters Centimeters Centimeters Centimeters Centmtrs. of Mere Centimtrs. of mere Centimtrs.of mere Centimtrs. of mere Centimtrs.
APPENDIX APPENDIX PRESSURE CONVERSION NOMOGRAPH To use the nomograph, simply place a straight edge so that it intersects the known value and lies across the center of the bullseye. Readings on all scales will then be equivalent. While conversion of pressure into various units is a simple operation, conversion of a large amount of data is tedious work and prone to error. This nomograph was designed to convert low pressures from one set of common units to any or all of three others.
APPENDIX APPENDIX TYPICAL GRAPH SYMBOLS FOR ELECTRICAL DIAGRAMS 134
APPENDIX SYMBOLS (Continued) 135
APPENDIX APPENDIX SYMBOLS (Continued) 136
APPENDIX APPENDIX SYMBOLS (Continued) 137
