Moyer Diebel 501-HT Technical Manual
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Moyer Diebel 501-HT Technical Manual

Undercounter dishwasher
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See also: Operation & Installation Manual , Installation/operation Manual With Service Replacement Parts
Simply Engineered Better
July, 2003
P.O. Box 4183
Winston-Salem, North Carolina 27115-4183
Moyer Diebel, U.S.
336/661-1992
Fax: 336/661-1979
Technical Manual
Undercounter
Dishwasher
Machine Serial No.
P/N
Manual
2674 N. Service Road
Jordan Station, Ontario, Canada L0R 1S0
Model
501-HT
501-HTN
501-LT
0508576
REV. J
Moyer Diebel, Ltd.
905/562-4195
Fax: 905/562-4618

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  • Page 1 Simply Engineered Better July, 2003 P.O. Box 4183 Winston-Salem, North Carolina 27115-4183 Moyer Diebel, U.S. 336/661-1992 Fax: 336/661-1979 Technical Manual Undercounter Dishwasher Model 501-HT 501-HTN 501-LT Machine Serial No. 0508576 Manual 2674 N. Service Road Jordan Station, Ontario, Canada L0R 1S0 Moyer Diebel, Ltd.
  • Page 2 1-905-562-4618 NOTE: When calling to order parts, be sure to have the model number, serial number, voltage, and phase of your machine, along with your customer account number. COPYRIGHT © 2003 by Moyer Diebel Serial Number ________________________ Phone _____________ Phone _____________...

  • Page 3: Revision History

    Revision History Revision Revised Serial Number Date Pages Effectivity 12/16/92 8/29/93 18-19 3100 8/29/93 20-21 8/29/93 24-25 3210 8/29/93 8/29/93 30-31 8/29/93 40-42 6/30/95 28-29 5733 6/30/95 30-31 5713 6/30/95 43-46 9/28/95 20-21 6264 4/18/96 — 6795 6/6/96 18, 38 6984 6/6/96 42-45...
  • Page 4 THIS PAGE INTENTIONALLY LEFT BLANK...

  • Page 5: Table Of Contents

    INTRODUCTION... WARRANTY ... GENERAL ... INSTALLATION ... Unpacking ... Electrical Connections... Plumbing Connections ... Detergent ... Rinse-Aid ... Chemical Sanitizer ... Completing Installation ... OPERATION ... Operation Summary ... Operation Procedures ... Extended Wash Cycle ... MAINTENANCE... 10 Cleaning Schedule... 10 Deliming...
  • Page 6 Figure 12—Control Cabinet ... 38 Figure 13—Electrical Diagram, 501-HT (For machines beginning with S/N W7604) ... 42 Figure 14—Electrical Diagram, 501-HT (For machines ranging from S/N 6984 to W7604) ... 43 Figure 15—Electrical Diagram, 501-HTN (For machines beginning with S/N 6984) ... 44 Figure 16—Electrical Diagram, 501-LT (For machines beginning with S/N 6984) ...

  • Page 7: Introduction

    INTRODUCTION Welcome to Moyer Diebel. Thank you for choosing Moyer Diebel and for allowing us to take care of your dishwashing needs. This manual covers several models. Model numbers are shown on the front cover. Your machine has been completely assembled, inspected, and thoroughly tested at our factory to eliminate problems at installation before it was shipped to your installation site.

  • Page 8: Limited Warranty

    Diebel, whichever occurs first. [See below for special provisions relating to Model Series DF and SW.] The warranty registration card must be returned to Moyer Diebel within ten (10) days after installation. If warranty card is not returned to Moyer Diebel within such period, the warranty will expire after one year from the date of shipment.

  • Page 9: General

    GENERAL This manual covers the Moyer Diebel undercounter dishwashing machine. This machine is fully automatic and is equipped with a 1/2 H.P. pump motor. All models are available for mounting directly to the floor or on optional stands (see accessories listed on page 4).
  • Page 10 GENERAL Accessories • 17RS - 17" rack stand (raises working height and adds rack storage) • 17T - 17" cabinet (raises working height and adds storage) • CST - Combination sink/table (scraping and sorting station) • 0501653 - Dish Rack (Peg Rack) •...

  • Page 11: Installation

    Immediately after unpacking your machine, inspect for any shipping damage. If damage is found, save the packing material and contact the carrier immediately. Remove the dishwasher from the skid. Adjust the feet if required, then move the machine to its permanent location.

  • Page 12: Plumbing Connections

    NOTE: A nonclorinated detergent is recommended for your dishwasher. Rinse Aid An optional rinse aid pump may be supplied for all models. Using a liquid rinse aid, insert the labeled Rinse Aid pickup tube into the rinse aid container.

  • Page 13: Completing Installation

    Completing Installation Remove any foreign material from inside the machine. Center the scrap screen over the sump opening. Prime the booster using the following procedure (if applicable). CAUTION: To prime the booster, the following procedure must be followed AFTER the electrical and plumbing connections have been made.

  • Page 14: Operation

    Operation Procedures The operation of your dishwasher will be more efficient when these procedures are followed: Check that the spray arms and scrap screen are in place. Close the door and depress the front edge of the door latch toward the door. Push the ON/FILL switch to the ON position.

  • Page 15: Extended Wash Cycle

    NOTE: The machine may be stopped at any time by opening the door. When restarted, the cycle does not start over. It will continue from the point at which it was interrupted. 7. Check the rinse temperature during the final rinse (120 seconds into cycle). The rinse temperature must be 82°C/180°F minimum for models 501HT, 501HTN, 501UT and 501UTLC and 60°C/140°F for models 501LT and 501UTL.

  • Page 16: Maintenance

    MAINTENANCE MAINTENANCE The efficiency and life of your machine is increased by regularly scheduled preventive maintenance. A well maintained machine gives better results and service. An investment of a few minutes of daily maintenance will be worthwhile. The best maintenance you can provide is to keep your machine clean. Components that are not regularly cleaned and flushed will clog and become inoperative.

  • Page 17: Deliming

    Deliming Your dishwasher should be delimed regularly as required. This will depend on the mineral content of your water. Inspect your machine interior for lime deposits. If deliming is required, a deliming agent should be used for best results. If you have the chemical sanitizing model (501LT or 501UTL), carefully follow the following...

  • Page 18: Maintenance Schedule

    MAINTENANCE Maintenance Schedule • As Required Check the temperature gauge reading. Check the chemical supplies and refill as necessary. • Weekly Inspect all water lines for leaks and tighten them at joints if required. Clean all detergent residue from the exterior of the machine. Check the drain for leaks.

  • Page 19: Troubleshooting

    TROUBLESHOOTING Before determining any specific cause of a breakdown or abnormal operation of your dishwasher, check that: Turn all switches ON, except for the extended wash switch. Wash arms are clean. Scrap screen is properly positioned and clean. Thermostat(s) are at their correct setting.
  • Page 20 TROUBLESHOOTING TROUBLESHOOTING (con’t) CONDITION No water in wash well Opening door prior ... to cycle completion No water in wash tank Door not latched ... after activating the ON/FILL switch Cycle time increases Incoming water... with each cycle temperature is too low CAUSE SOLUTION Close door.

  • Page 21: Replacement Parts

    REPLACEMENT PARTS REPLACEMENT PARTS...

  • Page 22: Figure 1-Track And Panel Assembly

    REPLACEMENT PARTS 00001 Figure 1 — Track and Panel Assembly...
  • Page 23 TRACK/PANEL ASSEMBLY Fig. 1 Part Item No. 0508751 Screw, 10-32 x 1-1/2" Lg. Truss Head ... 0308615 Front Panel (HT, HTN, LT) (Prior to S/N 6795) ... 0308646 Front Panel (HT, HTN, LT) (S/N 6795 and above)... 0308646 Front Panel (UTL, UT, UT-LC) ... 0308748 Front Panel (UT-MC) ...
  • Page 24 REPLACEMENT PARTS 00020 Figure 2 — Door Switch Assembly...

  • Page 25: Figure 2-Door And Switch Assembly

    DOOR & SWITCH ASSEMBLY (For Machines Beginning with S/N 6984 and Above) Fig. 2 Part Item No. 0501412 Screw, 10-32 x 3/8" Truss Head ... 0308596 Plate, Door Latch... 0308597 Handle, Door Latch ... 0508721 Retaining Ring, Plunger ... 0709462 Assembly, Door Catch (Includes items 4, 6) ...

  • Page 26: Figure 3-Tank Heat And Drain

    REPLACEMENT PARTS TO RINSE TO DRAIN Figure 3 — Tank Heat and Drain 00004 THERMOSTAT (CALLED OUT IN CONTROL BOX) THERMOMETER (CALLED OUT IN CONTROL BOX) TO PUMP DRAIN...

  • Page 27: Tank Heat/Drain Assembly

    TANK HEAT/DRAIN ASSEMBLY Fig. 3 Part Item No. 0508628 Scrap Screen... 0508536 Heater Element 220V-60Hz-1PH (HT, UT, UT-LC)... 0508537 Heater Element 110V-60Hz-1PH (HTN, LT, UTL) ... 0508578 Adapter, Pump Tube... 0501539 Nut, Plain 1/4-20 ... 0501501 Washer, Lock, 1/4" Split... 0308611 Support, Drain Valve ...
  • Page 28 REPLACEMENT PARTS 00005 TANK BOTTOM Figure 4 — Pump Assembly...

  • Page 29: Figure 4-Pump Assembly

    Fig. 4 Part Item No. 0508542 Spindle, Lower Wash Arm ... 0501431 Screw, 8-32 x 1-1/8" Round Head... 0501425 Screw, 8-32 x 5/8" Round Head ... 0508793 Housing, Diffuser ... 0502741 Diffuser... 0502704 Impeller ... 0502746 Adapter Plate, Suction... 0502745 Plate, Drain lnlet...
  • Page 30 REPLACEMENT PARTS TOP OF HOOD TANK BOTTOM PUMP FROM PUMP Figure 5 — Wash System Assembly 00006...

  • Page 31: Figure 5-Wash System Assembly

    WASH SYSTEM ASSEMBLY Fig. 5 Part Item No. 0508549 Hose, Upper Wash ... 0502563 Clamp, Hose 1"... 0708650 Spindle, Upper Wash Arm... 0503588 O-ring, 1-1/8" x 1-3/8" ... 0501412 Screw, 10-32 x 3/8" Lg. Truss Head... 0508541 Bushing, Upper Wash Arm... 0705047 Wash Arm, Upper ...
  • Page 32 REPLACEMENT PARTS TO BOOSTER OR FILL Figure 6 — Water Inlet Piping WATER CONNECTION WATER CONNECTION 00021...

  • Page 33: Figure 6-Water Inlet Piping

    WATER INLET PIPING ASSEMBLY Fig. 6 Part Item No. 0503718 Foot, Adjustable ... 0503679 Clamp, Hose ... 107417 Hose l/2" I.D. (all except HTN) ... 107417 Hose 1/2" I.D. (HTN)... 0502653 Elbow, 3/8 MPT x 1/2" Hose x 90° Brass ... 0504952 Valve, Solenoid 3/8 NPT ...
  • Page 34 REPLACEMENT PARTS 00018 Figure 7 — Fill System Figure 7 — Fill System...

  • Page 35: Figure 7-Fill System

    Fig. 7 Part Item No. 107417 Hose, 1/2" I.D. (HT, LT, UTL) ... 0501518 Tie Wrap, Hose... 106090 Bracket, Tie Wrap ... 107966 Nut, Grip, 10-32 w/Nylon Insert ... 0509048 Gasket, Inlet Chute (Beginning with S/N 5733 & above)... 0508867 Inlet Chute (Beginning with S/N 5733 &...

  • Page 36: Booster Assembly Diagram

    REPLACEMENT PARTS Figure 8 — Booster Assembly...

  • Page 37: Figure 8-Booster Assembly

    (Includes Models HT, UT, UT-LC) Fig. 8 Part Item No. 0503679 Clamp, Hose ... 107417 Hose, 1/2" I.D. (42") ... 0502653 Elbow, 3/8 MPT x 1/2" Hose x 90° Brass ... 0508840 Bushing, Reducing 3/4 NPT x 3/8 NPT Brass ... 0501419 Bolt, 1/4-20 x 1/2"...

  • Page 38: Figure 9—Detergent Pump Assembly

    REPLACEMENT PARTS 00022 TO FILL ASSY TO DETERGENT SUPPLY Figure 9 — Detergent Pump Assembly...

  • Page 39: Detergent Pump Assembly

    DETERGENT PUMP ASSEMBLY Fig. 9 Part Item No. 0503757 Motor, Pump... 0308637 Bracket, Detergent Pump (all except LT)... 0308610 Bracket, Detergent/Sanitizer Pumps (LT) ... Screw, M4 x 35mm Hex Head ... 0501412 Screw, 10-32 x 3/8" Lg. Truss Head... Housing, Pump ... 0501497 Washer, Lock #8 Split ...

  • Page 40: Figure 10—Sanitizer/Rinse-Aid Pump Assembly

    REPLACEMENT PARTS DETERGENT PUMP (SEE FIG. 9) Figure 10 — Sanitizer/Rinse Aid Pump Assembly TO FILL SYSTEM 00002 TO CHEMICAL SUPPLY...
  • Page 41 SANITIZER/RINSE AID PUMP Fig. 10 Part Item No. 0503756 Motor, Pump... 0308610 Bracket, Detergent/Sanitizer Pump (LT) ... 0308697 Bracket, Rinse-Aid Pump (Optional) ... 0501412 Screw, 10-32 x 3/8" Lg. Truss Head... 0501497 Washer, Lock #8 Split ... 0504822 Screw, 8-32 x 1/2" Lg. Pan Head ... 0707142 Rotor Assy...

  • Page 42: Figure 11—Drain Pump Assembly

    REPLACEMENT PARTS FROM DRAIN VALVE TO DRAIN Figure 11 — Drain Pump Assembly 00003...

  • Page 43: Drain Pump Assembly

    DRAIN PUMP ASSEMBLY Fig. 11 Part Item No. 0308119 Bracket, Pump Hold Down ... 0501419 Bolt, 1/4-20 x 1/2" Lg. Hex Head ... 0501501 Washer, Lock 1/4" Split... Motor, Pump... Backing Plate, Pump ... 0508370 Gasket, Pump Volute ... 0508369 Impeller, Pump ...

  • Page 44: Figure 12—Control Cabinet

    REPLACEMENT PARTS Figure 12 — Control Cabinet...
  • Page 45 CONTROL CABINET ASSEMBLY HT, HTN, LT, UTL, UT, UT-LC Fig. 12 Part Item No. 113622 Thermometer, 4 Ft. Gas Filled (Replaces 108391) ... 0508551 Lamp, Green... 0508552 Decal, Control Panel (All except LT, UTL) ... 0508553 Decal, Control Panel (LT, UTL)... 0708635 Control Panel...
  • Page 46 REPLACEMENT PARTS CONTROL CABINET ASSEMBLY (cont’d) Fig. 12 Part Item No. 0503701 Bearing, Timer Shaft ... 0501292 Power Cord (HTN, LT, UTL) (Not Shown) ... 112185 Bracket, Ranco thermostat ... — Sheetmetal screw (#8 x 3/16") ... — Screw (6/32 x 1/4") ... 0309433 Bracket, Relay ...
  • Page 47 ELECTRICAL SCHEMATICS ELECTRICAL SCHEMATICS...

  • Page 48: Figure 13—Electrical Diagram, 501-Ht (For Machines Beginning With S/N W7604)

    ELECTRICAL SCHEMATICS Figure 13 - Electrical Diagram, 501-HT (For machines Beginning with S/N W7604)
  • Page 49 Figure 14 - Electrical Diagram, 501-HT (For machines Ranging from S/N 6984) ELECTRICAL SCHEMATICS y y y y y y y y...

  • Page 50: Figure 15—Electrical Diagram, 501-Htn (For Machines Beginning With S/N 6984)

    ELECTRICAL SCHEMATICS y y y y y y y y y y y y y y y y y y y yy y Figure 15 - Electrical Diagram, 501-HTN (For machines beginning with S/N 6984) y y y y y y y y y y y y y y y...

  • Page 51: Figure 16—Electrical Diagram, 501-Lt (For Machines Beginning With S/N 6984)

    y y y y y y y y y y y y y y y yy Figure 16 - Electrical Diagram, 501-LT (For machines beginning with S/N 6984) yy y y y y y y y y y y y y y y y y ELECTRICAL SCHEMATICS y y y y...

  • Page 52: Figure 17—Electrical Diagram, 501-Ht (50Hz)

    (IF USED) DOOR SAFETY SWITCH DRAIN VALVE EXTENDED CYCLE/DELIME FILL VALVE GROUND WHTR WATER HEATER GREEN MAIN SWITCH ON/FILL OFF/DRAIN Figure 17 - Electrical Diagram, 501-HT (50 Hz) WHTR WASH/ START CW /RINSE START CCW DRAIN MAIN PRIME SWITCH DETERGENT, RINSE...
  • Page 53 CAM 6 RINSE CAM 7 DETERGENT CAM 8 AUTO-FILL DRAIN HLTS HIGH LIMIT THERMOSTAT Figure 18 - Electrical Diagram, 501-HT/UT/UTLC (For machines built prior to S/N 6984) CUSTOMER TO SUPPLY RATED VOLTAGE/PHASE/Hz, AS SPECIFIED PER ORDER, TO DISCONNECT SWITCH. ALL POWER SUPPLIED TO EACH CONNECTION POINT MUST COMPLY WITH ALL LOCAL ELECTRICAL CODES.

  • Page 54: Figure 19—Electrical Diagram, 501-Htn (For Machines Built Prior To S/N 6984)

    ELECTRICAL SCHEMATICS CAM 1 BLACK BLUE BOOSTER THERMOSTAT CAM 1 HOMING CAM 2 PUMP MOTOR CAM 3 PUMP MOTOR REVERSING CAM 4 DRAIN CAM 5 FILL CAM 6 RINSE CAM 7 DETERGENT CAM 8 AUTO-FILL DRAIN TO CUSTOMER RECEPTACLE 115V 60Hz CYCLE ON LIGHT PSDR PRIME SWITCH DETERGENT, RINSE...

  • Page 55: Figure 20—Electrical Diagram, 501-Lt/Utl (For Machines Built Prior To S/N 6984)

    BLACK CAM 9 AUTO-FILL DRAIN BLUE BOOSTER THERMOSTAT CAM 1 HOMING CAM 2 PUMP MOTOR CAM 3 PUMP MOTOR REVERSING CAM 4 DRAIN CAM 5 FILL CAM 6 RINSE CAM 7 SANITIZER CAM 8 DETERGENT Figure 20 - Electrical Diagram, 501-LT/UTL TO CUSTOMER RECEPTACLE 115V 60 Hz BLK WHT...

  • Page 56: Figure 21—Timer Chart And Diagram, 501-Ht (For Machines Beginning With S/N W7604)

    If booster thermostat is calling for heat, cam 9 will pause wash cycle until it reaches 82∞C/180∞F. 5 4 3 LOCKING SCREW TIMER ASSEMBLY 501HT Figure 21 - Timer Chart and Diagram, 501-HT (For machine beginning with S/N W7604) TIMER MOTOR 00014...
  • Page 57 FILL VALVE RINSE OPTIONAL PUMP DETERGENT PUMP AUTO-FILL DRAIN COM. TIMER SWITCH DETAIL Figure 22 - Timer Chart and Diagram, 501-HT 5 4 3 LOCKING SCREW TIMER ASSEMBLY 501HT (Prior to S/N W7603) ELECTRICAL SCHEMATICS 00014 TIMER MOTOR 51 51...

  • Page 58: Figure 23—Timer Chart And Diagram, 501-Ut

    ELECTRICAL SCHEMATICS TIMING CHART 501UT TIME IN SECS HOMING WASH PUMP FORWARD=WASH WASH PUMP REVERSE=DRAIN WASH PUMP REVERSING CAM DRAIN VALVE DRAIN PUMP FILL VALVE RINSE OPTIONAL PUMP DETERGENT PUMP AUTO-FILL DRAIN COM. TIMER SWITCH DETAIL Figure 23 - Timer Chart and Diagram, 501-UT 52 52 5 4 3 LOCKING SCREW...

  • Page 59: Figure 24—Timer Chart And Diagram, 501-Lt

    TIMING CHART 501LT TIME IN SECS HOMING WASH PUMP FORWARD=WASH WASH PUMP REVERSE=DRAIN WASH PUMP REVERSING CAM DRAIN VALVE DRAIN PUMP FILL VALVE RINSE PUMP SANITIZER PUMP DETERGENT PUMP AUTO-FILL DRAIN COM. TIMER SWITCH DETAIL TIMER ASSEMBLY 501LT Figure 24 - Timer Chart and Diagram, 501-LT 5 4 3 LOCKING SCREW ELECTRICAL SCHEMATICS...

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