Middleby Marshall PS220 manual

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1 © 2002 Middleby Marshall, Inc. is a registered trademark of Middleby Marshall, Inc. All rights reserved. Middleby Cooking Systems Group  1400 T oastmaster Drive  Elgin, IL 60120  (847) 741-3300  F AX (847) 741-4406  24-Hour Servi ce Hotline (800) 238-8444 This T echnical Service Manual includes information for the following oven m[...]

2 Section 1 - Sequence of Operation .................................................... 4 I . Gas Oven Sequence of Operation .. ... ........................................ 4 I I . Electric Oven Sequence of Operation ....................................... 6 Section 2 - Air Flow and Heat T ransfer .. .. . ........................................ 7[...]

3 III. H i g h L i m i t C ontrol Module ... .. ... .. .. ... .. ... .. ... .... .. ... .. .. ... .. . ............... 45 A . Part Number Reference - High Limit Control Modules ...... 45 B . Location .............................................................................. 45 C . Troubleshooting ................................................[...]

4 I . GAS OVEN SEQUENCE OF OPERA TIO N A . Electrical Supply Gas heated ovens operate on 208/240V , single phase. S t andard incoming power configurations are: 1 . 4-wire system (PS200 series, PS310/360 series, PS570, PS570S) - 2 single phase 208/240V sup- ply (hot) lines, 1 neutral and 1 ground. 2. 3-wire system (PS360WB70, PS360EWB, PS555, PS570G[...]

5 e . For ovens with an On-Off gas regulation sys- tem (with solenoid valve): T emperature Controller terminals 4 & 5 (power for the primary relay contacts for the high flame solenoid valve). For PS360EWB ovens with a modulating gas system and T emperature Controller P/N 32571: T emperature Controller terminals 4 & 5 (input signal to amplif[...]

6 ll. ELECTRIC OVEN SEQUENCE OF OPERA TION A . Electrical Supply Most electrically heated ovens operate on a 208/230/ 380/440V , 3 phase, 4 wire system. The fourth wire is for a 120 V neutral ground. This 120 V neutral ground eliminates the need for a control transformer . Where a neutral is not available, a 240/1 10V transformer is sup- plied. B. [...]

7 SECTION 2 AIR FLOW AND HEA T TRANSFER I . TYPES OF HEA T TRANSFER Heat constantly moves from a warm object to a cold ob- ject. Heat moves in three different ways: thorough con- duction, through radiation, and through convection. Middleby Marshall conveyor ovens use all three of these paths to cook the product.  Conduction - Heat is transferred[...]

8 B. PS360-series ovens PS360-series ovens feature two blower motors. A blower wheel is fastened onto the end of the motor shaft. In order to adjust the amount and speed of heated air that is directed by the blower wheels, it is necessary to change the size of the wheels and/or change the speed of the motor . See Figure 1. Each PS360-series oven mo[...]

9 SECTION 2 - AIR FLOW AND HEA T TRANSFER B. Configuration and Alignment T o ensure proper baking of the product, the air flow MUST be properly aligned as it exits the air fingers. Because air finger configurations are tested at the fac- tory for a specific customers product, severe bake prob- lems related to the air fingers are rare. If you enc[...]

10 T o perform the test bake: 1 . Select identical pans for the test. Choose the pans based on the width of the conveyor; you should space the pans in line completely across the conveyor with- out having them touch each other . For instance, for a 32 /813mm-wide conveyor , you could use three 10/ 254mm pans or two 15/381mm pans. Y ou will [...]

11 SECTION 2 - AIR FLOW AND HEA T TRANSFER of making a test to read the bake. 1. Remove all upper air fingers from the oven. NOTE: As the air fingers are removed, use a felt pen to mark all parts of the fingers. This includes the mani- fold, inner plate and outer plate. If a blank or choke plate is used, mark that plate also. Fingers are mark[...]

12 I V . OVEN CAP ACITY Oven capacity is generally not a service issue. However , when reporting a service problem, customers may use terms relating to capacity , such as bake time, belt time, time of deli very , etc. This information is provided as a reference for understanding these terms. A. Conveyor Speed and Bake Time Middleby Marshall conveyo[...]

13 SECTION 3 - SERVICING COMPONENTS SECTION 3 SERVICING COMPONENTS Figure 12 Original-style speed controller Produced with thumbwheel only. Interchangeable microcomputer selects oven model. THIS CONTROLLER IS OBSOLETE AND NO LONGER A V AILABLE. Figure 13 Current-style speed controller Produced with Thumbwheel or digital display. 4 or 8 DIP switches[...]

14 SECTION 3 - SERVICING COMPONENTS Figure 15 Old-style pickup assembly Figure 14 PS350-style pickup assembly (used on early PS360) C. Preparing to Service the Speed Controller NOTE: T o properly service this equipment, you must use a digi tal meter . An analog meter will not work. 1. Before troubleshooting the conveyor speed controller , check the[...]

15 SECTION 3 - SERVICING COMPONENTS Figure 16 Current pickup assembly - side view Figure 17 Current pickup assembly - end view D. Controller/Motor Failure When the conveyor speed controller fails, it is very pos- sible that a shorted conveyor motor caused the problem. Unless the motor is changed, the installation of another conveyor speed controlle[...]

16 E . Basic Troubleshooting Flowcharts 1. IF THE GEAR MOTOR RUNS A T FULL SPEED: SECTION 3 - SERVICING COMPONENTS NOTE: Middleby no longer stocks parts for the original speed controller with interchangeable microcom- puter . If it is necessary to replace this version of the controller or the microcomputer , and the service agent does not have the [...]

17 2. IF THE GEAR MOTOR WILL NOT RUN A T ALL: SECTION 3 - SERVICING COMPONENTS NOTE: Middleby no longer stocks parts for the original speed controller with inter- changeable microcomputer . If it is necessary to replace this version of the controller or the microcomputer , and the service agent does not have the parts in stock, it will be necessary[...]

18 SECTION 3 - SERVICING COMPONENTS F . Initial T roubleshooting NOTE: When changing the conveyor speed on a controller with a thumbwheel, it is advisable to turn the conveyor switch OFF before adjusting the thumbwheel. Note that this can- not be done on a digital keypad, as switching the conveyor switch OFF will also turn off the display . 1. Chec[...]

19 SECTION 3 - SERVICING COMPONENTS G . Conveyor Control Pickup T est 1. Visually check the pickup for the following:  The magnet is clean and the bearing is in good condition.  There are no chips or cracks on the magnet.  If using a PS350-style pickup (see Figure 14), there is a 1/64 to 1/32 (0-4-0.8mm, or a business card thickness)[...]

20 SECTION 3 - SERVICING COMPONENTS Figure 20 Wiring for PS360 Shielded Pickup Cable - early terminal block design Figure 21 Wiring for PS360 Shielded Pickup Cable - late terminal block design K . Appendices Appendix - Conveyor sensor wiring changes for PS360-series and PS570S, 10/95[...]

21 SECTION 3 - SERVICING COMPONENTS Appendix - Service Bulletin MM-133B - Installation Instructions for Conveyor Speed Controller Kit with Thumbwheel, P/N 42810-0133, 4/95[...]

22 SECTION 3 - SERVICING COMPONENTS Appendix - Service Bulletin MM-133B - Installation Instructions for Conveyor Speed Controller Kit with Thumbwheel, P/N 42810-0133, 4/95[...]

23 SECTION 3 - SERVICING COMPONENTS Appendix - Instructions for Service Kit 42810-0133- Conveyor Speed Controller Kit with Thumbwheel, 4/95[...]

24 SECTION 3 - SERVICING COMPONENTS Appendix - Instructions for Service Kit 42810-0133- Conveyor Speed Controller Kit with Thumbwheel, 4/95[...]

25 SECTION 3 - SERVICING COMPONENTS Appendix - Instructions for Service Kit 42810-0133- Conveyor Speed Controller Kit with Thumbwheel, 4/95[...]

26 SECTION 3 - SERVICING COMPONENTS Appendix - Instructions for Service Kit 42810-0133- Conveyor Speed Controller Kit with Thumbwheel, 4/95[...]

27 Service Bulletin SUBJECT Availability of Conveyor S peed Controller Kits GENERAL Middleby Marshall is changing is standard Conveyor S peed Controller from the familiar thumbwheel control to a unit that features a digital display with pushbutton speed selectors. The part numbers of these components are summarized here: Speed Controller with Thumb[...]

28 P/N 44757  Rev . C  V1  2/02 Instructions for Service Kit 44756 Conveyor Speed Controller Kit for PS200R68-series ovens KIT COMPONENTS: Qty . P/N Description 1 37337 Conveyor speed controller with digital display 1 44749 Cable assembly , PS200R68-series ovens 1 44757 I n structions, PS200R68-series oven conveyor speed controller kit W A[...]

29 SUBJECT New conveyor gear motors, brushes, and pickup clamps for Middleby Marshall ovens GENERAL The conveyor gear motors used on all Middleby Marshall ovens (except model PS536) have been redesigned by the vendor . Changes to the motors include:  A smaller-diameter motor casing.  New motor brushes. - Old-style motors continue to use brush[...]

30 I I . TEMPERA TURE CONTROLLER The T emperature Controller is used to set and control the oven temperature. Depending on the oven, model, the con- troller has several functions:  On gas ovens with On-Off gas valve operation , the tem- perature controller opens and closes the high flame solenoid. This allows 100% or 0% gas flow to the burner in[...]

31 Figure 22 - T emperature controllers  P/N 28071-0012 (A) Analog T emperature Controller without high-limit and cooldown functions, 120V , on-off mode only .  P/N 28071-0018 (A) Analog T emperature Controller wit h high-limit and cooldown functions, 120V , on-off mode only .  P/N 34983 (B) Analog T emperature Controller without high-limi[...]

32 B. Description The temperature controller consists of two main compo- nents: a sleeve or case (metal or plastic) with terminal con- nections on the back, and a plug-in chassis that includes the faceplate and circuitry . The sleeve is mounted to the panel or door of the oven, and the chassis is inserted into the front of the sleeve. VERY IMPORT A[...]

33 Page 1 of 10 Instructions for Service Kit 47321 Middleby Cooking Systems Group  1400 Toastmaster Drive  Elgin, IL 60120  USA  (847) 741-3300  F AX (847) 741-4406 KIT COMPONENTS Qty. P /N Description 1 46837 Digital T emperature Controller (On/Off Gas & Electric, PID Gas, and V ariable Pulse Electric operating modes), with moun[...]

34 Page 2 of 10 Controller T ypes This Kit includes one Digital T emperature Controller (P/N 46837) that can operate at 120-240V , and can be programmed to operate in on-off, PID, or variable pulse modes. The Controller is shown in Figure 1G , below . By following these instructions, the Controller can be installed into any Middleby Marshall oven e[...]

35 Page 3 of 10 W ARNING BEFORE PERFORMING ANY SERVICE WORK, THE ELECTRICAL POWER SUPPL Y AND THE GAS SUPPL Y MUST BE TURNED OFF . Before you Begin 1 . This T emperature Controller requires a current-version thermocouple for proper operation. Check that the thermocouple(s) installed in the oven match the current three-lead, flanged versions BE- FOR[...]

36 Page 4 of 10 5. Check that the new controller is mounted into its sleeve. Then, slide the assembly into the opening in the panel from the outside. Check that the controller is upright, with the display on top and the keypad on the bottom. 6. Locate the rectangular holes on the top and bottom of the new controller s sleeve. Attach the two kit-[...]

37 Page 5 of 10 Figure 4a Analog temperature controller (P/Ns 28071-0012 and 28071-0018) terminals New temperature controller terminals Not used. These terminals provide PID output (gas ovens with modulating valve) or variable Not used on some gas and electric ovens Not used Not used Analog temperature controller (P/N 34983) terminals New temperatu[...]

38 Page 6 of 10 Jumper Setting Loosen the Phillips screw at the bottom center of the faceplate. Then, pull the controller out of its sleeve. Next, access the jumper shown in Figure 6. This jumper affects the signal that is output from T erminals 15 and 16. The jumper MUST be set to the correct position for proper operation of the controller . Figur[...]

39 Page 7 of 10 Figure 7 T emperature Controller Service Instructions SECTION 3 - SERVICING COMPONENTS Appendix - Instructions for Service Kit 47321 - Digital T emperature Controller Kit, 2/02[...]

40 Diagnostic Error Messages The controller runs background tests during normal operation. If any problems occur during the tests, an error message flashes in the display . A listing of these diagnostic error messages is shown below . Flashes on the display (alter- nating with the temperature) indicating that the internal di- agnostic test has fail[...]

41 Display Shows the Set Point or the Actual T empera- ture in degrees Fahr- enheit (F) or Celsius (C). "SP LOCK" Light Lights when the set point is locked out from changes. This setting can only be changed by service personnel. OVERTEMP Light Lights when the oven temperature is greater than 650°F (343°C). T emperature Key Press this ke[...]

42 Middleby Cooking Systems Group  1400 T oastmaster Drive  Elgin, IL 6 0120 (847) 741-3300  F AX (847) 741-4406 Middleby Corporation Service Hotline 1-800-238-8444 SECTION 3 - SERVICING COMPONENTS Appendix - Instructions for Service Kit 47321 - Digital T emperature Controller Kit, 2/02[...]

43 SECTION 3 - SERVICING COMPONENTS Appendix - Service Bulletin MM-136 - Electrical Noise Filter Cap acitor Assembly on T emperature Controllers, 9/93[...]

44 SECTION 3 - SERVICING COMPONENTS Appendix - Service Bulletin MM-136 - Electrical Noise Filter Cap acitor Assembly on T emperature Controllers, 9/93[...]

45 III. H I GH L IM IT CONTROL MODULE On most PS200-series and PS300-series gas ovens, the temperature controller monitors the high limit. All other oven models use a High Limit Control Module that is inde- pendent of the temperature controller . Middleby ovens have used several different types of high limit control modules. See Figure 23.  The [...]

46 Qty. P/N Description 1 39732 Instructions 1 34982 Watlow high limit control module 1 30693 Reset switch w/ lighted pushbutton 1 35634 Mounting bracket, reset switch 1 35691 Wire set, reset switch (includes 4 wires and 3 1/4/25mm connectors) 1 33812-1 Thermocouple, type J, 6/152.4mm 1 39690 Mounting sleeve, thermocouple Instructions for Ser[...]

47 B. INSTALLATION WARNING BEFORE PERFORMING ANY SERVICE WORK, THE GAS SUPPLY (IF SO EQUIPPED) AND THE ELECTRICAL SUPPLY TO THE OVEN MUST BE TURNED OFF. 1. Open the machinery compartment and control compartment access panels. 2. Locate the high limit thermo bulb/capillary assembly. Its location is shown in Figure 2. Loosen the set screw that holds [...]

48 Figure 2 High limit thermocouple location - lower oven High limit thermocouple location - upper oven Figure 3 Figure 4 NOT TO SCALE Figure 5 Thermocouple Sleeve Figure 6 Page 3 of 8 Base Hole in sleeve is next to base of thermocouple SECTION 3 - SERVICING COMPONENTS Appendix - Instructions for Service Kit 39733 - High Limit Conversion Kit for PS[...]

49 C. WIRING For the various wiring connections listed below, cut the kit-supplied #18 AWG wires to length. Refer to Figures 7 and 8 (on pages 6 and 7) for diagrams of the wiring connections. Lighted Reset Switch Wiring and Installation 14. Using the kit-supplied 1/4 wire connectors, connect the following kit-supplied wires: - Red wires ........[...]

50 Page 5 of 8 D. TESTING THE INSTALLATION 22. Remove the thermocouple wires from the TC + and TC - terminals on the high limit control. 23. Attach a Middleby Marshall Thermocouple Source (P/N 27170-0263) to the TC + and TC - termi- nals on the high limit control, in place of the thermocouple wires. Note that it may be neces[...]

51 Page 6 of 8 Figure 7 - United Electric Model 55 replacement: ovens with a cooldown feature KEY SECTION 3 - SERVICING COMPONENTS Appendix - Instructions for Service Kit 39733 - High Limit Conversion Kit for PS300, 310, 350 & 360 Ovens, 5/99[...]

52 Page 7 of 8 Figure 8 - United Electric Model 54 replacement: ovens without a cooldown feature KEY SECTION 3 - SERVICING COMPONENTS Appendix - Instructions for Service Kit 39733 - High Limit Conversion Kit for PS300, 310, 350 & 360 Ovens, 5/99[...]

53 A MIDDLEBY COMPANY Middleby Cooking Systems Group  1400 Toastmaster Drive  Elgin, IL 60120  USA  (847) 741-3300  FAX (847) 741-4406 Middleby Corporation Service Hotline 1-800-238-8444 www.middleby.com Page 8 of 8 SECTION 3 - SERVICING COMPONENTS Appendix - Instructions for Service Kit 39733 - High Limit Conversion Kit for PS300, 3[...]

54 SECTION 3 - SERVICING COMPONENTS I V . THERMOCOUPLES All temperature controller and high limit functions are based on input from thermocouples. When two wires composed of dissimilar metals are joined together and one of the ends is heated, a continuous current flow is generated. Middleby ovens use a T ype J (iron constant) thermocouple. The iron[...]

55 SECTION 3 - SERVICING COMPONENTS 2. Checking the thermocouple with a DC millivolt meter It is possible to check that a thermocouple is reading accurately by using a multimeter set to read DC milli- vo lts. At 32°F/0°C the thermocouple should read 0 mVDC. This can be checked by inserting the ther- mocouple into an ice bath for several minutes. [...]

56 1 Instructions for Service Kits P/Ns 33984 and 33985 Oven Thermocouple Kit Middleby Cooking Systems Group  1400 T oastmaster Drive  Elgin, I L 60120  USA  (847) 741-3300  F AX (847) 741-4406 This Service Kit provides the parts and instructions necessary to replace one temperature-sensing or high limit thermo- couple in any of the [...]

57 2 PS200 Series - before 2/96, serial numbers before ASH-0001 Thermocouples on these ovens are located inside the ma- chinery compartment. They are secured in place by a set screw in the mounting tube, inside the plenum chamber . This Kit eliminates the set screw . The new thermocouple is held in place by the head of the screw that is already use[...]

58 3 PS360 Series rear wall thermocouples - before 2/96, serial numbers before ASH-0001 Thermocouples on these ovens are located on the rear wall of the baking chamber . They are secured in place by a clamp on the outside of the oven. This Kit eliminates the clamp. The flange of the new ther- mocouple is held to the back wall of the oven by a retai[...]

59 4 PS360 Series front-mounted thermocouple inside the machinery compartment These thermocouples are mounted in a tube that extends diagonally up and into the plenum chamber . They are se- cured in place by a set screw located on the mounting tube, and by a bead of high-temperature silicone around the end of the shaft. The new thermocouple will be[...]

60 5 PS536 Thermocouples on these ovens are located inside the ma- chinery compartment. They are secured in place by a sheet metal screw that traps the thermocouple flange against the wall of the compartment. See Figure 7. NOTE FOR HIGH LIMIT THERMOCOUPLES: PS536 ovens have two thermocouples, one mounted above the other . The upper thermocouple sen[...]

61 6 PS555 Gas - thermocouples with screw ter- minal connections (no terminal blocks) Thermocouples on these ovens are located on the rear wall. They are secured in place by two screws that are inserted through the holes in the thermocouple flange. These ovens are equipped with a three-lead, flanged thermocouple iden- tical to the one in this Kit. [...]

62 7 PS555 Electric and PS555E T emperature-sensing thermocouples on these ovens are lo- cated on the rear wall. High limit thermocouples are lo- cated inside the machinery compartment. All thermo- couples are secured in place by two screws that are in- serted through the holes in the thermocouple flange. These ovens are equipped with a three-lead,[...]

63 8 PS570 (X01-X05 name plate ID numbers) and PS570S (early) with side-mounted thermo- couples inside or outside the blower motor compartments These ovens are equipped with two thermocouples, one on each end wall of the oven. The thermocouples may be mounted either inside or outside of the blower motor com- partments.  The thermocouple on the r[...]

64 9 Figure 12a Thermocouple Wiring - PS570 and PS570S (early) after thermocouple update - Left to Right Conveyor Figure 11 Location of New Thermocouple Mounting Holes - PS570, PS570S Thermocouple positions for Pizza Hut/T ricon ovens Thermocouple positions for non-Pizza Hut/T ricon ovens High limit thermocouple position for ovens with LEFT -TO-RIG[...]

65 10 Figure 13 Location of High Limit Thermocouple Mounting Hole - PS570S High limit thermocouple position for ovens with LEFT -TO-RIGHT conveyors High limit thermocouple position for ovens with RIGHT -TO-LEFT conveyors PS570S (late) - rear wall thermocouples with lef t-side AND right-side terminal block connec- tions Thermocouples on these ovens [...]

66 11 Figure 14a Thermocouple Wiring - PS570S (Late) - Left to Right Conveyor Red (temp) White (temp) Ground leads T o temperature controller T o high limit control module White (hi lim) Red (hi lim) Ground leads (all) White (temp) Red (temp) T o mounting screw for high limit control module T o ground terminal on temp controller T o temperature con[...]

67 12 PS555G and PS570G rear wall thermocouples with left-side terminal block connections Thermocouples on these ovens are located on the rear wall. They are secured in place by two screws that are inserted through the holes in the thermocouple flange. The ovens are equipped with a three-lead, flanged thermocouple iden- tical to the one in this Kit[...]

68 V. BLOWERS A. PS200-series ovens All PS200 ovens are equipped with one 1/3hp blower mo- tor . The motor indirectly drives a pulley on the shaft of the blower fan with a fan belt. T wo main designs exist for the PS200 indirect fan drive assembly:  Early design, used through 6/90. This design used 1/2 (12.7mm) bore flange mount bearings and [...]

69 3. Lubricating the blower fan shaft bearings NOTE: Middleby recommends lubricating the blower fan shaft bearings every three months. Use a grease gun to lubricate the main blower fan shaft bearings. See Figure 28. W hen lubricating the bear- ings:  Use a high-quality NLGI #2, lithium soap grease with petroleum oil, such as Middleby P/N 17110-[...]

70 5. Early-style PS200 bearing replacement and alignment NOTE: This procedure is for early-style indirect fan shaft assemblies only , as shown in Figure 25. Bearing replacement procedures for the current-style indirect fan shaft assembly (Figure 26) are provided on Page 72. NOTE: The bracket assembly is designed for slight up and down and right to[...]

71 Figure 32 Bearing replacement and alignment - early-style PS200 fan shaft assembly Item Qty. Part Number Description 11 Not available Back Wal l A ssembly 2 8 21216-0001 Scr ew , He x Cap SS 3/ 8-16x1 3 16 21422-0001 Lock W asher , Split 3/8 4 20 21416-0001 Fl at Washer , SS 3/8 51 Not available Indirect Fan Drive Bracket Assembly 61 No[...]

72 6. Current-style PS200 bearing replacement and alignment NOTE: This procedure is for current-style indirect fan shaft assemblies only , as shown in Figure 26. Bearing replacement procedures for the early-style indirect fan shaft assembly (Figure 25) are provided on Page 70. The following procedures are necessary to align the fan shaft whenver se[...]

73 SECTION 3 - SERVICING COMPONENTS Figure 34 Bearing replacement and alignment - current-style PS200 fan shaft assembly Item Qty. Part Number Description 1 1 37900-0068 B ack Wal l A ssembly 2 16 21216-0001 Scre w , Hex Cap SS 3 / 8-16x1 3 16 21422-0001 Lock W asher , Split 3/8 4 12 21416-0001 Fl at Washer , SS 3/8 5 1 37900-0101 B racket[...]

74 B. PS360-series ovens All PS360-series ovens are equipped with two blower motors.  All gas ovens have motors rated at 230V , single-phase.  All electric ovens built before 8/02 have three-phase motors.  All electric ovens built 8/02 or later that operate on a supply voltage of 208-240V have single-phase motors.  All electric ovens bu[...]

75 3. Direction of blower rotation Proper blower rotation is extremely important. Blower rotation is determined by viewing the motor and wheel from the REAR of the motor (or from the open end of the oven). See Figures 37-39. Figure 37 - Clockwise blower wheel Direction of rotation Figure 38 - Counterclockwise blower wheel Direction of rotation Note[...]

76 A. PS555/570-series ovens All PS555/570-series ovens are equipped with two 1hp blower motors. Each motor indirectly drives a pulley on the shaft of a blower wheel with a fan belt. T wo main designs exist for the PS555/570 blower fan sys- tem:  PS570/570S design. In this version, the pillow block bearings for the blower wheel shaft were mounte[...]

77 Part Number Description 27381-0069 Mo t o r , 1 hp , 208-240V , 50/60 Hz, 1 Ph 22521-0005 B l ower wheel, clockwise (right end of PS570; left end of PS555, PS570S, PS570G) 22521-0006 B l ower wheel, counterclockwise (left end of PS570; right end of PS555, PS570S, PS570G) 1. Part number reference Part Number Description 22072-0026 Bearing, pillow[...]

78 2. Blower balancing and direction of rotation Proper blower rotation is extremely important. Proper blower rotation is shown in Figure 45. Early PS570 blower wheels were positioned so that the open end of the wheel faced into the baking cham- ber . This was changed on the PS570S (and all later models) to improve airflow . Note that this also mea[...]

79 4 . Blower belt tension NOTE: Middleby recommends checking the blower belt condition and tension every three months. Check the blower belt for at least 1" / 25mm deflection at the center, and for cracking or excessive wear. Overtightening the belt will cause premature bearing failure and possible vibrations. See Figure 47. If necessary, adj[...]

80 Figure 49 - PS360-series blower motor centrifugal safety switch Switch V I . BLOWER MOTOR CENTRIFUGAL SAFETY SWITCH (PS360-SERIES) Middleby ovens have a safety feature that prevents the burner/heating elements from activating if the blower(s) are not in operation. On PS360-series ovens, this feature is controlled by a centrifugal switch mounted [...]

81 Figure 50 - Air pressure safety switch models 1. Original-style round air switch Replace with #2 2. Dungs square-case air switch with dial adjustment Replace with same 3. Dungs square-case replacement air switch with screw adjustment Replace with #2 4. Y a ma take-Honeywell air switch, non-adjustab le Replace with same Adjustment screw Adj[...]

82 1 . Original-style round air switch with screw adjustment (P/N 28023-0005) This was the standard switch used through 9/96 and is no longer available. If it must be replaced, use Kit P/N 35624 (for use in the USA) or 35625 (for export use). See #2 below for a description of these kits. 2 . Dungs square-case air switch with dial adjustment This wa[...]

83 C . Appendices SECTION 3 - SERVICING COMPONENTS Appendix - Instructions for Service Kits 35624 and 35625 - Air Pressure Switch Replacement Kits, 1/97[...]

84 SECTION 3 - SERVICING COMPONENTS Appendix - Instructions for Service Kits 35624 and 35625 - Air Pressure Switch Replacement Kits, 1/97[...]

85 SECTION 3 - SERVICING COMPONENTS Appendix - Instructions to Replace an Alternate Air Switch P/N 36194 with Service Kit P/N 35624, 3/97[...]

86 SECTION 3 - SERVICING COMPONENTS Appendix - Instructions to Replace an Alternate Air Switch P/N 36194 with Service Kit P/N 35624, 3/97[...]

87 IX . PS570/570S FLAME GA T E All PS570/570S ovens produced for Pizza Hut USA through 8/00 were equipped with an adjustable flame gate at the end of the burner tube. The purpose of the flame gate was to direct heat towards the entrance end of the oven to bet- ter suit the customers cooking needs. PS570S ovens produced 9/00 or later , as well a[...]

88 Figure 54 PS200-series gas train Figure 55 PS310, PS314, PS360 or PS360WB gas train Manual shutoff valve, 1/2 231 15-0009 1/2 union 23051-0003 Combination gas control valve, 1/2 45688 Solenoid valve, 1/2 28091-0017 Pilot pressure tap 30185 Bypass line (1/4 aluminum tubing) 15125-0002 (per foot) Pilot line (1/4 aluminum tubing) [...]

89 SECTION 3 - SERVICING COMPONENTS Figure 56 PS360EWB or PS360WB70 gas train with Midco burner Figure 57 PS360EWB or PS360WB70 gas train with W ayne burner Air shutter 42810-0087 Burner blower and motor assy , 208/240V 27170-0287 Manual shutoff valve, 3/4 231 15-0010 3/4 union 23051-0004 Combination gas control valve, 3/4 32569 PS360EWB O[...]

90 Figure 58 PS570S gas train Figure 59 PS570G or PS555 gas train Manual shutoff valve, 1/2 231 15-0009 1/2 union 23051-0003 Combination gas control valve, 1/2 45688 Solenoid valve, 1/2 28091-0017 Pilot pressure tap 30185 Bypass line (1/4 aluminum tubing) 15125-0002 (per foot) Pilot line (1/4 aluminum tubing) 15125-0002 (per foot)[...]

91 PS360WB70/EWB PS360WB70/EWB PS200 PS220/224 PS310/314/360 PS360WB Midco burner Wayne burner PS555 PS570S/PS570G Description 42810-0125 42810-0126 42810-0120 42810-0127 36863 44664 43061 42810-0127 GAS CONVERSION KIT , PROP ANE TO NA TURAL 22176-0010 22176-0016 22176-0004 22176-0014 31821 22176-0014 43059 22176-0014 M AI N O R I F I C E , N A TUR[...]

92 SECTION 3 - SERVICING COMPONENTS C. Component Identification 1. Burner type Middleby ovens are equipped with one of two main burner designs. Details of these burners are provided below . 1 . Midco burner - see Figure 61. This burner was used on PS360WB70 and PS360EWB ovens only . Late-production PS360EWB and PS360WB70 ov- ens used the Wayne burn[...]

93 SECTION 3 - SERVICING COMPONENTS D. Pilot/Ignitor Assembly The pilot assembly is attached to the end of the pilot line. It consists of an ignitor electrode/flame sensor , a pilot shield and the pilot burner . See Figure 63. The pilot assembly includes a safety circuit. An electrical current is sent to the flame sensor probe to prove the pres- en[...]

94 3. Pilot and Proof of Pilot Flame Rectification With standing pilots, heat is a necessary ingredient for proper thermocouple opera- tion. But this is not the case with IIDS (Intermittent Ignition Device Systems) when flame conduction or rectification is used. T o better understand the principles of flame conduction and rectification, we must fir[...]

95 SECTION 3 - SERVICING COMPONENTS E . Burner Blower Motor The burner blower motor is located on the side or top of the burner housing. Some blowers use a flexible tube to con- nect the blower t o the burner , depending on the available space inside the machinery compartment. The burner blower motor drives a blower wheel located in a housing attac[...]

96 G . Burner Tr ansformer 120V burner blower motors feature a transformer located in the electrical junction box on the burner. In PS570S ovens, AND all ovens with 208/240V burner blower motors, the transformer is located inside the machinery compartment. The transformer supplies 24V to the burner motor relay (if present) and also to the 24V gas v[...]

97 SECTION 3 - SERVICING COMPONENTS Digi tal T emperature Controller MUST BE SET TO PID OPERA TING MODE Amplifier Board Modulating V al ve T o thermocouple white + red - purple T o transformer 24V AC input purple/white blue blue/white orange orange/white bypass adjustment screw (under cap) MUST BE FULL Y CLOSED Figure 71 - Modulating Gas System K. [...]

98 M. Combination Gas Control V a lve 1. Part Number Reference - Combination Gas V alv e  PS360WB70 and PS360EWB ovens are equipped with a 3/4 (19.05mm) gas line. This requires the use of Combination Gas V alve P/N 32569. The valve has a tan plastic cover with a blue On/Off knob.  All other oven models are equipped with a 1/2 (12.7mm) g[...]

99 N. Ignition Module 1. Part Number Reference - Ignition Module  PS360WB70 and PS360EWB ovens equipped with the Midco burner use Ignition Module P/N 31501.  For all other oven models: - Through 10/90 - these ovens used Ignition Module P/N 27161-0004. Some versions of this module included a separate, replaceable fuse. This mod- ule shared a c[...]

100 P . Burner and Gas Train Troubleshooting 1. Burner Blower Motor If there is 1 10V (or 208/240V , as appropriate) to the motor terminals, it should be running. If the motor is not running, replace it. 2. Burner Blower Motor Centrifugal Switch (or air pressure safety switch) If the burner blower motor is running at top speed, and you cannot measu[...]

101 Figure 75 V olt age Checks for Ignition Module and Combination Gas V alve Ignition Module V olt age T e s t Po i n ts M a r k e d Fu sed Nonfused MV/PV to PV 3 V AC 24 V AC MV/PV to MV 12 V AC 24 V AC Combination Gas V alve TR to TH 12 V AC 24 V AC TH/TR to TR 3 V AC 24 V A C NOTE: Information on the fused ignition module is provided for refere[...]

102 9. Component Checks Reset System After Lockout If the oven enters safety lockout, the system must be reset before attempting further operation or checkout. The system will remain in safety lockout until it is re- set. Shut system OFF . (Turn Heat switch OFF .) Wai t at least five minutes, then turn Heat switch ON. 10. Check Spark Ignition Circu[...]

103 R. T roubleshooting Flowcharts SECTION 3 - SERVICING COMPONENTS[...]

104 SECTION 3 - SERVICING COMPONENTS[...]

105 SECTION 3 - SERVICING COMPONENTS[...]

106 SECTION 3 - SERVICING COMPONENTS[...]

107 SECTION 3 - SERVICING COMPONENTS S . Appendices Appendix - Instructions for Service Kit 42810-01 17 - Pilot/Ignitor Kit, 7/91[...]

108 SECTION 3 - SERVICING COMPONENTS Appendix - Instructions for Service Kit 30185 - Pilot T ee, 3/94[...]

109 SECTION 3 - SERVICING COMPONENTS Appendix - Instructions for Service Kit 30185 - Pilot T ee, 3/94[...]

110 SECTION 3 - SERVICING COMPONENTS Appendix - Instructions for Service Kit 30185 - Pilot T ee, 3/94[...]

111 SECTION 3 - SERVICING COMPONENTS Appendix - Instructions for Service Kit 30185 - Pilot T ee, 3/94[...]

112 SECTION 3 - SERVICING COMPONENTS Appendix - Instructions for Service Kit 42810-0121 - Combination Gas V alve, 1/92[...]

113 SECTION 3 - SERVICING COMPONENTS Appendix - Instructions for Service Kit 42810-0121 - Combination Gas V alve, 1/92[...]

114 Appendix - Instructions for Service Kit 42810-0121 - Combination Gas V alve, 1/92 SECTION 3 - SERVICING COMPONENTS[...]

115 Appendix - Instructions for Service Kit 42810-0121 - Combination Gas V alve, 1/92 SECTION 3 - SERVICING COMPONENTS[...]

116 SECTION 3 - SERVICING COMPONENTS Appendix - Instructions for Service Kit 42810-01 14 - Ignition Module, 1 1/90[...]

117 SECTION 3 - SERVICING COMPONENTS Appendix - Instructions for Service Kit 42810-01 14 - Ignition Module, 1 1/90[...]

118 SECTION 3 - SERVICING COMPONENTS Appendix - Position of Combination Gas V alve Component s during Burner Operation, 4/02[...]

119 ENGLISH - page 1 ES P AÑOL - página 7 1 Instructions for Service Kits 42810-01 19, 42810-0122, 42810-0123, 42810-0124, 43062, 44665 Gas Conversion Kit for Middleby Marshall Ovens Natural Gas to Prop ane Operation KIT COMPONENTS: Qt y . PS200 PS220/224 PS310/360 PS360WB PS360WB70/EWB PS555 PS570S D escription 1 42810-0122 42810-0123 42810-01 1[...]

120 ENGLISH 2 T ypical PS200-series gas train configuration T ypical PS300-series gas train configuration T ypical PS555 or PS570S gas train configuration Gas pipe union Combination gas control valve (safety regulator) Solenoid valve Pilot line Burner Burner blower Pilot pressure tap (pilot tee) Bypass line Gas pipe union Combination gas control va[...]

121 ENGLISH 3 I . PREPARATION AND DISASSEMBLY 1. Turn off the electric power supply to the oven. 2. Turn off the gas supply at the service valve behind the oven. 3. Open the machinery compartment door . 4. Open the union in the gas supply line. The union is located on the inlet side of the combination gas control valve. See Figure 1. 5. Unscrew the[...]

122 ENGLISH 4 I V. PILOT ORIFICE CONVERSION 1. Unscrew the two 1/2" nuts that secure the gas train to the venturi mounting plate. See Figure 4. 2. Unscrew the pilot tube compression nut, and slide it out of the way. Then, pull the tube from the fitting to expose the pilot orifice. See Figure 4. 3. Separate the venturi, mounting plate, and gas [...]

123 ENGLISH 5 VI I. GAS LEAK TEST 1. Restore the electrical and gas utility connections to the oven. 2. Paint all gas pipe connections from the union to the venturi mounting plate, as well as the pilot tubing, bypass tubing, and pressure tap plug, with a rich solution of soap and water (2/3 soap, 1/3 water is recommended). Any visible bubbles indic[...]

124 ES P AÑOL - página 7 ENGLISH - page 1 6 5. The pilot pressure should be adjusted as follows:  The current flow between the pilot hood and the flame sensor, when measured with a microamp meter or multimeter, holds constant at a minimum of 2.0 µA. See Figure 7.  The pilot pressure as shown on the manometer is in the range of 8-10 W.C.[...]

125 ENGLISH - page 1 ES P AÑOL - página 7 1 Instructions for Service Kits 42810-0120, 42810-0125, 42810-0126, 42810-0127, 43061, 44664 Gas Conversion Kit for Middleby Marshall Ovens Prop ane to Natural Gas Operation KIT COMPONENTS: Qt y . PS200 PS220/224 PS310/360 PS360WB PS360WB70/EWB PS555 PS570S D escription 1 42810-0125 42810-0126 42810-0120 [...]

126 ENGLISH 2 T ypical PS200-series gas train configuration T ypical PS300-series gas train configuration T ypical PS555 or PS570S gas train configuration Gas pipe union Combination gas control valve (safety regulator) Solenoid valve Pilot line Burner Burner blower Pilot pressure tap (pilot tee) Bypass line Gas pipe union Combination gas control va[...]

127 ENGLISH 3 I . PREPARATION AND DISASSEMBLY 1. Turn off the electric power supply to the oven. 2. Turn off the gas supply at the service valve behind the oven. 3. Open the machinery compartment door . 4. Open the union in the gas supply line. The union is located on the inlet side of the combination gas control valve. See Figure 1. 5. Unscrew the[...]

128 ENGLISH 4 I V. PILOT ORIFICE CONVERSION 1. Unscrew the two 1/2" nuts that secure the gas train to the venturi mounting plate. See Figure 4. 2. Unscrew the pilot tube compression nut, and slide it out of the way. Then, pull the tube from the fitting to expose the pilot orifice. See Figure 4. 3. Separate the venturi, mounting plate, and gas [...]

129 ENGLISH 5 VI I. GAS LEAK TEST 1. Restore the electrical and gas utility connections to the oven. 2. Paint all gas pipe connections from the union to the venturi mounting plate, as well as the pilot tubing, bypass tubing, and pressure tap plug, with a rich solution of soap and water (2/3 soap, 1/3 water is recommended). Any visible bubbles indic[...]

130 ES P AÑOL - página 7 ENGLISH - page 1 6 5. The pilot pressure should be adjusted as follows:  The current flow between the pilot hood and the flame sensor, when measured with a microamp meter or multimeter, holds constant at a minimum of 2.0 µA. See Figure 7.  The pilot pressure as shown on the manometer is in the range of 3-1/2 - 4[...]

131 Combination gas control valve Aluminum pilot tubing Pilot orifice Main orifice holder Solenoid valve (PS360WB70 only) Low flame bypass (PS360WB70 only) W ARNING This conversion kit is to be installed by a Middleby Marshall Authorized Service Organization in accordance with the manufacturer ’ s instructions and all codes and requirements of th[...]

132 5. GAS LEAK TEST 5.1 Paint all pipe connections from the gas union to the burner plenum, and the aluminum pilot and low flame orifice tubing connect ions, with a solution of soap and water (2/3 soap, 1/3 water is recommended). Any bubbles that are visible indicate a gas leak. 5.2 If a gas leak is detected, tighten the affected joints and connec[...]

133 Insert a 5/16” (7.94mm) drill bit to measure opening (remove before operation) Blowers without external air shutter OR External air shutter 6. INLET PRESSURE CHECK 6.1 Check the gas control inlet pressure at the inlet pressure tap. See Figure 6 . An inlet pressure of 6-14” (14.9-34.9mbar) is recommended for propane operation. 6.2 If the inl[...]

134 Figure 7 Red “LPG.” label placement (on burner housing) Figure 8 Conversion information label THIS APPLIANCE HAS BEEN CONVERTED ON _______________ TO ______________ GAS WITH KIT NO. ________________ BY _______________ , WHO ACCEPTS THE RESPONSIBILITY FOR THE CORRECTNESS OF THIS CONVERSION. MODEL NO. MAIN BURNER ORIFICE SIZE MANIFOLD PRESSUR[...]

135 Combination gas control valve Aluminum pilot tubing Pilot orifice Main orifice holder Solenoid valve (PS360WB70 only) Low flame bypass (PS360WB70 only) W ARNING This conversion kit is to be installed by a Middleby Marshall Authorized Service Organization in accordance with the manufacturer ’ s instructions and all codes and requirements of th[...]

136 5. GAS LEAK TEST 5.1 Paint all pipe connections from the gas union to the burner plenum, and the aluminum pilot and low flame orifice tubing connect ions, with a solution of soap and water (2/3 soap, 1/3 water is recommended). Any bubbles that are visible indicate a gas leak. 5.2 If a gas leak is detected, tighten the affected joints and connec[...]

137 p/n 36862 P . Jan. 98 Rev B Page 3 of 4 6. INLET PRESSURE CHECK 6.1 Check the gas control inlet pressure at the inlet pressure tap. See Figure 6 . An inlet pressure of 6-14” (14.9-34.9mbar) is recommended for natural gas operation. 6.2 If the inlet pressure is: • HIGHER THAN 14” W. C. (34.9mbar) - This pressure may damage the combination [...]

138 Figure 7 Y ellow “NA T .” label placement (on burner housing) Figure 8 Conversion information label THIS APPLIANCE HAS BEEN CONVERTED ON _______________ TO ______________ GAS WITH KIT NO. ________________ BY _______________ , WHO ACCEPTS THE RESPONSIBILITY FOR THE CORRECTNESS OF THIS CONVERSION. MODEL NO. MAIN BURNER ORIFICE SIZE MANIFOLD P[...]

139 SECTION 3 - SERVICING COMPONENTS Appendix - Equivalent Orifice Sizes at High Altitudes (Includes 4% reduction for each 1000 ft. above sea level), 4/02[...]

140 SECTION 3 - SERVICING COMPONENTS 3. Supply Ovens have a 208V , 220-240V , 380V , 416V or 480V AC electrical supply . The control current of the oven oper- ates at 1 10V , single phase. If the oven was specified for a 3 wire system, it was supplied with an optional control transformer to step the 3 phase current down for the control circuit. If [...]

141 SECTION 3 - SERVICING COMPONENTS 5. Checking the Heating Elements The most common problems encountered with electric heaters are:  Open or bad connections.  Open, shorted or grounded heating elements. T o troubleshoot the heating elements, disconnect all leads at the back wall and check each element with a digital multimeter set to Ohms ([...]

142 SECTION 3 - SERVICING COMPONENTS B. PS310/360-series ovens 1 . Description of heating system All PS310/360-series electric ovens use an on-off sys- tem for heater activation. When the oven demands heat, the temperature controller activates mercury contactors that in turn activate the heaters at 100% power . The contactors open when the temperat[...]

143 SECTION 3 - SERVICING COMPONENTS 4. Heater specifications  PS310/360-series electric ovens use 18 heating elements in 3 banks (6 elements per bank).  208V elements are used for ovens with a 208V supply .  240 volt elements are used for ovens with a 220, 230 or 240V supply . 240V elements are also used on ovens with a 416V or 480V suppl[...]

144 SECTION 3 - SERVICING COMPONENTS C. PS555 ovens 1 . Description of heating system All PS555 electric ovens use a variable pulse system for heater activation. In response to the millivolt signal from the thermocouple, the temperature controller sends a 4-20mA signal to a controller module. This module contains an amplifer board and two solid sta[...]

145 SECTION 3 - SERVICING COMPONENTS 6. Changing Heating Elements NOTE: Wires going from the controller assembly contactor to the heating elements are rated at 392°F/ 200°C. DO NOT , under any circumstances, use a wire of lesser rating or quality . T o remove the element:  Remove the blower belt on the affected side of the oven.  Remove the[...]

146 SECTION 3 - SERVICING COMPONENTS D . Mercury Contactor Replacement Early PS200-series electric ovens and all PS310/360-se- ries electric ovens use mercury contactors to activate the heating elements. Each pole in the contactor is a separate mercury-filled tube that is individually replaceable. This feature ensures that the entire contactor shou[...]

147 SECTION 3 - SERVICING COMPONENTS Figure 87 Figure 89 Figure 88  Support the wide end of the tube between two pieces of wood so that the terminal end will not be damaged.  Place a deep well socket over the new Tinnerman clip.  Gently tap the socket with a hammer to push the clip down and into place. NOTE: When replacing the mercury cont[...]

148 SECTION 3 - SERVICING COMPONENTS Figure 90 Figure 92 Figure 91 2. PS310/360-series contactor replacement  Remove the two Phillips-head screws holding the cover in place. Then, remove the cover .  Remove the six terminal lug screws. This proce- dure must be followed when replacing the coil or any one contact tube.  The coil and contact [...]

149 SECTION 4 - ELECTRICAL WIRING DIAGRAMS I . COMPONENT WIRING A . T emperature Controllers SECTION 4 ELECTRICAL WIRING DIAGRAMS[...]

150 B . Ignition Modules SECTION 4 - ELECTRICAL WIRING DIAGRAMS[...]

151 PS200-series gas oven (with solenoid valve and analog temp control), 208/240V main blower motor , 120V control circuit 208/240V , 50/60 Hz, 1 Ph, 3 pole, 4 wire supply (2 hot, 1 neutral, 1 ground) SECTION 4 - ELECTRICAL WIRING DIAGRAMS I I . PS200-SERIES OVENS[...]

152 PS200-series gas oven (with solenoid valve and digital temp control), 208/240V main blower motor , 120V control circuit 208/240V , 50/60 Hz, 1 Ph, 3 pole, 4 wire supply (2 hot, 1 neutral, 1 ground) SECTION 4 - ELECTRICAL WIRING DIAGRAMS[...]

153 PS200-series gas oven (with modulating valve), 208/240V main blower motor and control circuit 208/240V , 50/60 Hz, 1 Ph, 2 pole, 3 wire supply (2 hot, 1 ground) SECTION 4 - ELECTRICAL WIRING DIAGRAMS[...]

154 PS200R68-series gas oven (with solenoid valve), 208/240V main blower motor , 120V control circuit 208/240V , 50/60 Hz, 1 Ph, 3 pole, 4 wire supply (2 hot, 1 neutral, 1 ground) SECTION 4 - ELECTRICAL WIRING DIAGRAMS[...]

155 P AGE 1 OF 2 PS200R68-series gas oven (with modulating valve), 208/240V main blower motor and control circuit 208/240V , 50/60 Hz, 1 Ph, 2 pole, 3 wire supply (2 hot, 1 ground) SECTION 4 - ELECTRICAL WIRING DIAGRAMS[...]

156 P AGE 2 OF 2 PS200R68-series gas oven (with modulating valve), 208/240V main blower motor and control circuit 208/240V , 50/60 Hz, 1 Ph, 2 pole, 3 wire supply (2 hot, 1 ground) SECTION 4 - ELECTRICAL WIRING DIAGRAMS[...]

157 PS200VL-series gas oven (with analog temp control 34983), 208/240V main blower motor , 120V control circuit 208/240V , 50/60 Hz, 1 Ph, 3 pole, 4 wire supply (2 hot, 1 neutral, 1 ground) SECTION 4 - ELECTRICAL WIRING DIAGRAMS[...]

158 PS200-series electric oven (USA version), 208/240V main blower motor and heating elements, 120V control circuit 208/240V , 50/60 Hz, 3 Ph, 4 pole, 5 wire supply (3 hot, 1 neutral, 1 ground) SECTION 4 - ELECTRICAL WIRING DIAGRAMS[...]

159 PS200-series electric oven (export version), 208/240V main blower motor and heating elements, 120V control circuit 220-240V , 50/60 Hz, 3 Ph, 3 pole, 4 wire supply (3 hot, 1 ground) SECTION 4 - ELECTRICAL WIRING DIAGRAMS[...]

160 III. P S 360-SERIES OVENS PS310/314/360/360WB gas oven (with analog temp control), 208/240V main blower motor , 120V control circuit 208/240V , 50/60 Hz, 1 Ph, 3 pole, 4 wire supply (2 hot, 1 neutral, 1 ground) SECTION 4 - ELECTRICAL WIRING DIAGRAMS[...]

161 PS310/314/360/360WB gas oven (with digital temp control), 208/240V main blower motor , 120V control circuit 208/240V , 50/60 Hz, 1 Ph, 3 pole, 4 wire supply (2 hot, 1 neutral, 1 ground) SECTION 4 - ELECTRICAL WIRING DIAGRAMS[...]

162 PS360WB70 gas oven (with Midco burner and solenoid valve), 208/240V main blower motor and control circuit 208/240V , 50/60 Hz, 1 Ph, 2 pole, 3 wire supply (2 hot, 1 ground) SECTION 4 - ELECTRICAL WIRING DIAGRAMS[...]

163 PS360EWB gas oven (with Midco burner and early temp control 32571), 208/240V main blower motor and control circuit 208/240V , 50/60 Hz, 1 Ph, 2 pole, 3 wire supply (2 hot, 1 ground) SECTION 4 - ELECTRICAL WIRING DIAGRAMS[...]

164 PS360EWB gas oven (with W ayne burner and temp control 36056 or 46837), 208/240V main blower motor and control circuit 208/240V , 50/60 Hz, 1 Ph, 2 pole, 3 wire supply (2 hot, 1 ground) SECTION 4 - ELECTRICAL WIRING DIAGRAMS[...]

165 PS360-series electric oven, 208/240V main blower motor and heating elements, 120V control circuit 208/240V , 50/60 Hz, 3 Ph, 4 pole, 5 wire supply (3 hot, 1 neutral, 1 ground) SECTION 4 - ELECTRICAL WIRING DIAGRAMS[...]

166 III. PS555/570-SERIES OVENS PS570 or PS570S gas oven (with solenoid valve and analog temp control), 208/240V main blower motor , 120V control circuit 208/240V , 50/60 Hz, 1 Ph, 3 pole, 4 wire supply (2 hot, 1 neutral, 1 ground) SECTION 4 - ELECTRICAL WIRING DIAGRAMS[...]

167 PS570 or PS570S gas oven (with solenoid valve and digital temp control), 208/240V main blower motor , 120V control circuit 208/240V , 50/60 Hz, 1 Ph, 3 pole, 4 wire supply (2 hot, 1 neutral, 1 ground) SECTION 4 - ELECTRICAL WIRING DIAGRAMS[...]

168 PS570S gas oven (with modulating valve), 208/240V main blower motor , 120V control circuit 208/240V , 50/60 Hz, 1 Ph, 3 pole, 4 wire supply (2 hot, 1 neutral, 1 ground) SECTION 4 - ELECTRICAL WIRING DIAGRAMS[...]

169 PS555 gas oven (early), 208/240V main blower motor and control circuit 208/240V , 50/60 Hz, 1 Ph, 2 pole, 3 wire supply (2 hot, 1 ground) SECTION 4 - ELECTRICAL WIRING DIAGRAMS[...]

170 PS555G or PS570G gas oven, 208/240V main blower motor and control circuit 208/240V , 50/60 Hz, 1 Ph, 2 pole, 3 wire supply (2 hot, 1 ground) SECTION 4 - ELECTRICAL WIRING DIAGRAMS[...]

171 PS555 electric oven, 208/240V main blower motor , heating element s and control circuit 208/240V , 50/60 Hz, 3 Ph, 3 pole, 4 wire supply (3 hot, 1 ground) SECTION 4 - ELECTRICAL WIRING DIAGRAMS[...]

172 SECTION 5 - REFERENCE 25-point preventative maintenance checklist [ ] 1 . Check and clean (blow out) machinery/control compartment. [ ] 2 . Check and clean (blow out) main blower motors. [ ] 3 . Check and clean (blow out and brush) axial fans. [ ] 4 . Check burner blower motor and fan operation. [ ] 5 . Check and clean igniter assembly . [ ] 6 [...]

173 SECTION 5 - REFERENCE Fractional inches to decimal and millimeter equivalents Decimal equivalents of drill sizes[...]

174 SECTION 5 - REFERENCE atmospheres (std. - 760mm of mercury at 32°F/0°C ) ...................... 14. 696 ..... l bs ./ sq . inc h atmospheres ........................ 76 .0 ....... cm of m ercury atmospheres ....................... 29.92 ...... in . of m ercury atmospheres ....................... 33.90 ...... ft. of water atmospheres .........[...]

175 SECTION 5 - REFERENCE Pressure conversion chart T o use this chart, simply place a straightedge so that it intersects the known value and lies across the center of the bullseye. Readings on all scales will then be equivalent. Ohms Law equation wheel Using this wheel, you can calculate any one of the following four basic factors of electricit[...]

176 SECTION 5 - REFERENCE Common electrical wiring diagram symbols[...]

177 SECTION 5 - REFERENCE Common electrical wiring diagram symbols (continued)[...]

178 SECTION 5 - REFERENCE Common electrical wiring diagram symbols (continued)[...]

179 SECTION 5 - REFERENCE Common electrical wiring diagram symbols (continued)[...]

180 © 2002 Middleby Marshall, Inc. is a registered trademark of Middleby Marshall, Inc. All rights reserved. Middleby Cooking Systems Group  1400 T oastmaster Drive  Elgin, IL 60120  (847) 741-3300  F AX (847) 741-4406  24-Hour Servi ce Hotline (800) 238-8444 Middleby is proud to support the Commercial Food Equipment Service Associa[...]