Moyer Diebel 501HT, 501HTN, 501LT User Manual

Simply Engineered Better

Technical Manual

Undercounter
Dishwasher

Model

501-HT
501-HTN
501-LT

July, 2003

P.O. Box 4183
Winston-Salem, North Carolina 27115-4183

Moyer Diebel, U.S.
336/661-1992
Fax: [phone]

Manual P/N 0508576 REV. J

2674 N. Service Road
Jordan Station, Ontario, Canada L0R 1S0

Moyer Diebel, Ltd.

905/562-4195

Fax: [phone]

Machine Serial No.

Complete the information below so it will be available for quick reference.

Model Number __________________________ Serial Number ________________________

Voltage and Phase ______________________________________________________________

Moyer Diebel Parts Distributor _______________________________ Phone _____________
(if applicable)

_____________________________________________________________________________

Moyer Diebel Service Agency ________________________________ Phone _____________

_____________________________________________________________________________

Moyer Diebel Service:

Moyer Diebel Limited Moyer Diebel, US

Phone: [phone] Phone: [phone]

1-800-263-5798 1-800-228-8350

Fax: [phone] Fax: [phone]

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

Revision History

Revision Revised Serial Number Comments

Date Pages Effectivity

12/16/92 All — Reissue of manual and new replacement parts lists.

8/29/93 18-19 3100 Redesign of door catch plunger and housing.

8/29/93 20-21 — Redesign of thermometer fitting.

8/29/93 24-25 3210 Redesign of upper wash arm hub and gasket.

8/29/93 27 — Added part numbers for valve kit.

8/29/93 30-31 — Changed booster element part numbers.

8/29/93 40-42 — Revised wiring schematics.

6/30/95 28-29 5733 Redesign of inlet chute.

6/30/95 30-31 5713 Redesign of booster assembly.

6/30/95 43-46 — Added timer charts and diagrams.

9/28/95 20-21 6264 Redesign drain, eliminated tank overflow.

4/18/96 — 6795 Models 501UT, UTLC, UTL discontinued.

6/6/96 18, 38 6984 Redesign door safety switch, added magnetic

reed switch and relay.

6/6/96 42-45 6984 Revised wiring schematics.

8/1/96 — 7220 Redesigned all models to have same height.

9/1/96 26-27 7306 Flexible fill hose added.

1/9/97 42 6984 Revised wiring schematic.

5/16/98 21 9624 Redesigned drain hose

(P/N 0507265 changed to 0509302).

9/9/98 42-44 6984 Revised wiring schematics.

2/28/00 13 — Revised troubleshooting instructions item #1, All

switches on except extended wash switch.

11/16/00 39

— Replaced P/N 112204 thermostats with P/N 109069 in

booster for all serial numbers.

8/22/01 21 — Revised part numbers on hose clamps and hose.

2/5/03 39 –– Replaced 108391 with 113622 thermometer.

4/23/03 3,8,14,38,40,42,50 W7604 Added Final Rinse Sentry information.

4/23/03 29,31 –– Changed hose P/N 0509214 to P/N 107417.

7/23/03 27, 29 –– Changed hose P/N 0502665, 0509214, 107214 to 107417

REVISIONS

THIS PAGE

INTENTIONALLY

LEFT BLANK

CONTENTS

CONTENTS

Page

INTRODUCTION....................................................................................................................................... 1

WARRANTY .............................................................................................................................................. 2

GENERAL .................................................................................................................................................. 3

INSTALLATION ........................................................................................................................................ 5

Unpacking ............................................................................................................................................ 5

Electrical Connections.......................................................................................................................... 5

Plumbing Connections ......................................................................................................................... 6

Detergent .............................................................................................................................................. 6

Rinse-Aid ............................................................................................................................................. 6

Chemical Sanitizer ............................................................................................................................... 6

Completing Installation ........................................................................................................................ 7

OPERATION .............................................................................................................................................. 8

Operation Summary ............................................................................................................................. 8

Operation Procedures ........................................................................................................................... 8

Extended Wash Cycle .......................................................................................................................... 9

MAINTENANCE........................................................................................................................................ 10

Cleaning Schedule................................................................................................................................ 10

Deliming............................................................................................................................................... 11

Deliming Process.................................................................................................................................. 11

Maintenance Schedule.......................................................................................................................... 12

TROUBLESHOOTING .............................................................................................................................. 13

REPLACEMENT PARTS........................................................................................................................... 15

ELECTRICAL DIAGRAMS ...................................................................................................................... 42

TIMER CHARTS and DIAGRAMS........................................................................................................... 50

LIST OF FIGURES

Figure 1—Track and Panel Assembly......................................................................................................... 16

Figure 2—Door and Switch Assembly........................................................................................................ 18

Figure 3—Tank Heat and Drain .................................................................................................................. 20

Figure 4—Pump Assembly ......................................................................................................................... 22

Figure 5—Wash System Assembly............................................................................................................. 24

Figure 6—Water Inlet Piping ...................................................................................................................... 26

Figure 7—Fill System ................................................................................................................................. 28

Figure 8—Booster Assembly ...................................................................................................................... 30

CONTENTS

Figure 9—Detergent Pump Assembly....................................................................................................... 32

Figure 10—Sanitizer/Rinse-Aid Pump Assembly....................................................................................... 34

Figure 11—Drain Pump Assembly ............................................................................................................. 36

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) .................................. 45

Figure 17—Electrical Diagram, 501-HT (50Hz) ........................................................................................ 46

Figure 18—Electrical Diagram, 501-HT/UT/UTLC (For machines built prior to S/N 6984).................... 47

Figure 19—Electrical Diagram, 501-HTN (For machines built prior to S/N 6984) ................................... 48

Figure 20—Electrical Diagram, 501-LT/UTL (For machines built prior to S/N 6984) ............................. 49

Figure 21—Timer Chart and Diagram, 501-HT (For machines beginning with S/N W7604) ................... 50

Figure 22—Timer Chart and Diagram, 501-HT (For machines prior to S/N W7603) ............................... 51

Figure 23—Timer Chart and Diagram, 501-UT.......................................................................................... 52

Figure 24—Timer Chart and Diagram, 501-LT .......................................................................................... 53

1

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. This manual
provides:

•Warranty information

• Installation and operation procedures

• Maintenance instructions

•Troubleshooting guide

•Replacement parts lists.

Complete and return your warranty registration card as soon as possible.

Moyer Diebel constantly improves its products; therefore, specifications contained in this
manual may have changed.

For your protection, factory authorized parts should always be used.

Replacement parts may be ordered directly from Moyer Diebel or from your Moyer Diebel
authorized parts distributor or service agency.* When ordering parts, supply the model number,
serial number, voltage and phase of your machine, the part number, part description, and quantity.

*Moyer Diebel can only ship parts to customers with accounts or by C.O.D.

2

WARRANTY

LIMITED WARRANTY

Moyer Diebel, P.O. Box 4183, Winston-Salem, North Carolina 27115, and P. O. Box 301, 2674 North Service Road,
Jordan Station, Ontario, Canada L0R 1S0 warrants machines, and parts, as set out below.

Warranty of Machines: Moyer Diebel warrants all new machines of its manufacture bearing the name “Moyer Diebel”

and installed within the United States and Canada to be free from defects in material and workmanship for a
period of one (1) year after the date of installation or fifteen (15) months after the date of shipment by Moyer
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.

Moyer Diebel will not assume any responsibility for extra costs for installation in any area where there are
jurisdictional problems with local trades or unions.

If a defect in workmanship or material is found to exist within the warranty period, Moyer Diebel, at its
election, will either repair or replace the defective machine or accept return of the machine for full credit;
provided, however, as to Model Series DF and SW, Moyer Diebel’s obligation with respect to labor associated
with any repairs shall end (a) 120 days after shipment, or (b) 90 days after installation, whichever occurs first.
In the event that Moyer Diebel elects to repair, the labor and work to be performed in connection with the
warranty shall be done during regular working hours by a Moyer Diebel authorized service technician.
Defective parts become the property of Moyer Diebel. Use of replacement parts not authorized by Moyer
Diebel will relieve Moyer Diebel of all further liability in connection with its warranty. In no event will
Moyer Diebel’s warranty obligation exceed Moyer Diebel’s charge for the machine. The following are not
covered by Moyer Diebel’s warranty:

a. Lighting of gas pilots or burners.

b. Cleaning of gas lines.

c. Replacement of fuses or resetting of overload breakers.

d. Adjustment of thermostats.

e. Adjustment of clutches.

f. Opening or closing of utility supply valves or switching of electrical supply current.

g. Adjustments to chemical dispensing equipment.

h. Cleaning of valves, strainers, screens, nozzles, or spray pipes.

i. Performance of regular maintenance and cleaning as outlined in operator’s guide.

j. Damages resulting from water conditions, accidents, alterations, improper use, abuse, tampering, improper

installation, or failure to follow maintenance and operation procedures.

Examples of the defects not covered by warranty include, but are not limited to: (1) Damage to the exterior or
interior finish as a result of the above, (2) Use with utility service other than that designated on the rating plate,
(3) Improper connection to utility service, (4) Inadequate or excessive water pressure, (5) Corrosion from chemicals
dispensed in excess of recommended concentrations, (6) Failure of electrical components due to connection of
chemical dispensing equipment installed by others, (7) Leaks or damage resulting from such leaks caused by
the installer, including those at machine table connections or by connection of chemical dispensing equipment
installed by others, (8) Failure to comply with local building codes, (9) Damage caused by labor dispute.

Warranty of Parts: Moyer Diebel warrants all new machine parts produced or authorized by Moyer Diebel to be free

from defects in material and workmanship for a period of 90 days from date of invoice. If any defect in
material and workmanship is found to exist within the warranty period Moyer Diebel will replace the
defective part without charge.

DISCLAIMER OF WARRANTIES AND LIMITATIONS OF LIABILITY. MOYER DIEBEL’S WARRANTY IS
ONLY TO THE EXTENT REFLECTED ABOVE. CHAMPION MAKES NO OTHER WARRANTIES, EXPRESS
OR IMPLIED, INCLUDING, BUT NOT LIMITED, TO ANY WARRANTY OF MERCHANTABILITY, OR
FITNESS OF PURPOSE. MOYER DIEBEL SHALL NOT BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL
DAMAGES. THE REMEDIES SET OUT ABOVE ARE THE EXCLUSIVE REMEDIES FOR ANY DEFECTS
FOUND TO EXIST IN MOYER DIEBEL DISHWASHING MACHINES AND MOYER DIEBEL PARTS, AND
ALL OTHER REMEDIES ARE EXCLUDED, INCLUDING ANY LIABILITY FOR INCIDENTALS OR
CONSEQUENTIAL DAMAGES.

Moyer Diebel does not authorize any other person, including persons who deal in Moyer Diebel dishwashing machines
to change this warranty or create any other obligation in connection with Moyer Diebel Dishwashing Machines.

3

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).

Standard equipment includes:

-Automatic tank fill -Upper and lower wash/rinse arms

-Common utility connections -Two dish racks (peg and flat)

-120 Volt control circuit -Exclusive vent design for

-Convenient, easy to use controls venting of condensation

-Door latch activated start switch -Stainless steel heavy-gauge construction,

-Detergent pump including base

-Final Rinse Sentry (high temp models only)

This series of dishwashers is available in the following models:

Model Numbers

501HT, 501HTN, 501LT

• The 501HT model is a high temperature (82oC/180oF rinse) sanitizing model with booster.

• The 501HTN model is a high temperature (82oC/180oF rinse) sanitizing model without
booster.

• The 501LT model is a low temperature (60oC/140oF rinse) sanitizing model for use with

5.25% or 8.4% sodium hypochlorite solution (chlorine bleach) as a sanitizing agent. The
rinse aid pump is optional.

Options

• Kit 504 - Top and side panels (P/N 0708756)

• Kit 505 - Top panel only (P/N 0708744)

• Kit 506 - Left side panel only (P/N 0708745)

• Kit 507 - Right side panel only (P/N 0708746)

• Kit 508 - Rinse aid pump kit (P/N 0708754)

• Kit 510 - Extended reach pumped drain kit (HT, HTN, LT) (P/N 0708766)

• Kit 511 - 30oC/70oF temperature rise booster (for 49oC/11OoF supply water).

4

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)

•0501654 - Silverware Rack (Flat Bottom Rack)

• 0710364 - 5" Base/Stand

Electrical Power Requirements

Booster Machine Power Requirement

Model Voltage Rise Full Load Amp (125% Service Factor)
501LT 115/60/1 N/A 12 15
501HTN 115/60/1 N/A 12 15
501HT 208/60/1 40 36 44
501HT 240/60/1 40 40 49
501HT 208/60/1 70 48 59
501HT 240/60/1 70 55 68

NOTE:

208-240V/60Hz/1PH electrical supply service must be a 3-wire plus ground for connection
as shown.

—3-Wire Plus Ground Diagram

00023

115v

115v

L

1

L

2

NG

5

INSTALLATION

INSTALLATION

Unpacking

WARNING:

Care should be taken when lifting the machine to prevent damage.

1. Immediately after unpacking your machine, inspect for any shipping damage. If damage is
found, save the packing material and contact the carrier immediately.

2. Remove the dishwasher from the skid. Adjust the feet if required, then move the machine to
its permanent location.

3. Level the machine (if required) by placing a level on the top of the machine and adjusting
the feet. Level the machine front-to-back and side-to-side.

CAUTION:

After locating your machine, it must meet local health codes. An example may be to seal
your machine to the floor using a good grade of silicone sealant.

Electrical Connections

WARNING:

Electrical and grounding connections must comply with the National Electrical Code
and/or Local Electrical Codes.

WARNING:

When working on the dishwasher, disconnect the electric service and tag it to indicate work
is being done on that circuit.

1. The electrician should compare the electrical specifications on the machine electrical
junction box (located behind the front panel) to the electrical power supply before
connecting the machine to the incoming service at a fused disconnect switch.

NOTE:

The 208-240V/60Hz/1PH electrical supply service for this machine must be a
3-wire plus ground service.

2. On the 208V-240V models, a knock-out is provided at the rear of the junction box (located
behind the front panel) for electrical service connections. A fused disconnect switch or
circuit breaker (supplied by user) is required to protect each power supply circuit.

3. On 115V models, your machine is already equipped with a 4-foot power cord and plug
suitable for 115V-15A service.

!

!

!

!

INSTALLATION

6

Plumbing Connections

CAUTION:

Plumbing connections must comply with local sanitary and plumbing codes.

Water Connections

1. Connect the hot water supply (60

o

C/ 140oF Min) to the 1/2" I.D. fill hose. The fill solenoid
valve is equipped with a flow control that will accept water pressures from 172 kPa/25 psi
to 665 kPa/95 psi.

2. Install a manual shut-off valve in the water supply line to accommodate servicing the
machine. The shut-off valve should be the same size or larger than the supply line.

3. The fill solenoid valve is equipped with a built-in strainer to protect from particles in the
water supply.

Drain Connections

1. All Models are supplied with a flexible 5/8" I.D. drain hose, which must be connected to a
1-1/2" drain using a wye (Y) fitting.

Detergent

1. Use a qualified detergent/chemical supplier for your detergent, rinse aid, and chemical
sanitizer needs.

2. Your machine is supplied with a detergent dispensing pump that is internally wired and
ready for use. Using a liquid detergent, insert the labeled Detergent pickup tube into the
detergent container. The pickup tube has a strainer on the end to prevent crystallized
chemical from clogging the supply lines.

3. The cycle timer located in the main control cabinet is equipped with adjustable cams for the
chemical dispensing pump(s). The cams control the length of time that the pumps operate.
A qualified person may adjust the cam settings if necessary. Refer to the timer chart
diagram(s) at the end of the manual for timer cam locations and factory time settings.

NOTE:

A nonclorinated detergent is recommended for your dishwasher.

Rinse Aid

1. 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.

Chemical Sanitizer

1. Model 501LT is supplied with an internally wired chemical sanitizer dispensing pump.
Using a 5.25% or 8.4% sodium hypochlorite solution, insert the labeled Chemical Sanitizer
pickup tube into the chemical sanitizer container.

2. Contact your chemical supplier for adjustment of the chemical sanitizer.

!

INSTALLATION

7

Completing Installation

1. Remove any foreign material from inside the machine.

2. Center the scrap screen over the sump opening.

3. 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.

a. Close the front door.

b. Remove the front panel.

c. Locate the Installation and Service toggle switch on the extreme left side of

the control box.

d. Press the toggle switch down to the Booster Fill position and hold it

approximately 1 minute (or until water can be heard entering the machine).

e. Release the toggle switch to stop the water flow.

f. You have completed the booster priming process.

NOTE:

Push the Installation and Service toggle switch to the UP position.
Electrical power is now supplied to the machine.

WARNING:

Failure to prime the booster may cause damage to the booster elements and other
electrical components and will void the warranty.

4. After plumbing and electrical connections are completed, check the machine for water leaks

by depressing the ON/FILL switch on the front panel, then close and latch the door. This
allows the tank to fill and to complete the rinse cycle. Check for leaks.

5. Open the door and check the water level. The water level should barely cover the scrap
screen.

6. Depress the OFF/DRAIN switch and close and latch the door to drain the tank. This allows
the machine to complete the 100-second wash and drain cycle. Check the drain plumbing
for leaks.

7. Replace the front panel. Installation is now complete.

!

!

8

OPERATION

OPERATION

Operation Summary

The following is a summary of your Undercounter Dishwashing Machine operating cycle:

1. The cycle begins when you depress the front edge of the door latch toward the door.

2. The green cycle lamp lights and the pump starts.

3. The pump runs during the wash cycle for approximately 80 seconds. The wash cycle
duration is extended if booster is not up to temperature.

4. The pump stops, and the drain is opened.

5. After a 2-3 second pause, the pump drain cycle begins and continues for approximately
30 seconds.

6. After a 2-3 second pause, the fill valve opens, and the pump starts for the rinse cycle.

7. Within approximately 25 seconds, the rinse cycle is complete. The pump stops, the green
cycle lamp turns off, and the cycle is complete.

8. Open the door and remove the rack of clean ware. The door must remain open for 5 seconds
to allow the timer to reset before starting another cycle.

Operation Procedures

The operation of your dishwasher will be more efficient when these procedures are followed:

1. Check that the spray arms and scrap screen are in place.

2. Close the door and depress the front edge of the door latch toward the door. Push the
ON/FILL switch to the ON position. The tank will begin filling with water. This procedure
is followed only when the tank is empty.

3. When the tank is full, check the wash tank temperature gauge. Minimum wash temperatures are:

• 501HT, 501HTN - 66°C/150°F.

• 501LT - 60°C/140°F.

4. Scrap and preflush all items to be washed, and load the items into the rack. DO NOT
OVERLOAD the rack. Wash only one layer of silverware in a rack.

5. Open the door and insert the rack into the machine.

6. Shut the door, and depress the door latch. This will start the wash cycle. The green cycle
lamp located on the front control panel will light. This lamp will remain on until the entire
wash and rinse cycle is completed.

9

OPERATION

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.

8. The pump will automatically stop and the green cycle light will turn off indicating the cycle
is completed.

9. Open the door and remove the rack.

10. Repeat steps 4-9 for additional cycles. Machine operation is automatic.

11. CLEAN the scrap screen after every meal period. During heavy usage, the scrap screen
should be cleaned more frequently.

CAUTION:

Poor machine performance and/or damage to the machine can occur if the scrap
screen becomes clogged with soil or waste particles.

12. After completing usage for the day, water in the tank should be drained by depressing the
OFF/DRAIN switch and closing and latching the door. This initiates a 100 second wash and
drain cycle that drains the tank.

CAUTION:

DO NOT LEAVE WATER IN THE TANK OVERNIGHT. Water left in the tank
overnight will allow harmful chemicals to deteriorate the tank.

Extended Wash Cycle

On models 501HT, 501HTN, 501UT and 501UTLC, but not on models 501LT and 501UTL, an
extended wash cycle is available for pots, pans and heavily soiled items.

To use the Extended Wash Cycle:

1. Insert the loaded rack into the machine. Close the door and depress the latch. Wait 10
seconds for the detergent to be dispensed automatically.

2. Flip the Extended Wash/Delime Switch to the UP position. The green cycle light will go
out, indicating that the machine is in a CONTINUOUS wash mode.

3. When your desired wash time has passed, flip the Extended Wash/Delime Switch to the
DOWN position. The green cycle light will come on, indicating a return to the normal wash
mode. The machine will now complete the remaining portion of the automatic cycle.

!

!

10

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.

Intervals shown in the following schedules represent an average length of time between necessary
maintenance. Maintenance intervals should be shortened whenever your machine is faced with
abnormal working conditions, hard water, or multiple shift operations.

Cleaning Schedule

• Daily-Every 8 Hours

1. Depress the OFF/DRAIN switch to OFF and close and latch the door to drain the tank.

2. Open the door and remove both the upper and lower spray arms by unscrewing the
knurled fastener holding each spray arm.

3. Remove the scrap screen carefully to keep soil or waste particles from falling into the
sump.

4. Clean inside the tank with clean water. Backflush the scrap screen until it is clean. Do
not strike the screen against solid objects.

5. Clean the wash arms to remove any debris from spray openings. Do not strike the spray
arms against solid objects.

6. Reinstall the scrap screen and spray arms.

7. Leave the door open overnight to allow drying.

8. Report any unusual conditions to your supervisor.

• Meal Periods

1. Clean the scrap screen after every meal period and more frequently during heavy usage.
Do not allow the scrap screen to become clogged with soil or waste particles.

11

MAINTENANCE

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
procedure before deliming:

DANGER:

Deliming solution or other acids must not come in contact with household bleach (sodium
hypochlorite) or any chemicals containing chlorine, iodine, bromine, or fluorine. Mixing
will cause hazardous gases to form. Skin contact with deliming solutions can cause severe
irritation and possible chemical burns. Consult your chemical supplier for specific safety
precautions.

1. Remove the sanitizer tube from the container. Place the tube into a container of hot water.

2. Depress and hold the SANITIZER prime switch (located on the front panel) until clear

water enters the tank through the fill air gap.

3. Close the door and depress the door latch. Complete two operating cycles to purge the

machine of all sanitizer.

Deliming Process

Complete the following procedure to delime your machine:

1. Add the delime chemical to wash the tank (per chemical supplier specifications).

2. Close and latch the door.

3. On models 501HT, 501HTN, 501UT and 501UTLC depress the EXTENDED

WASH/DELIME switch on the front panel as soon as the cycle starts. On models 501LT
and 501UTL, proceed to step 5 of this procedure.

NOTE:

The EXTENDED wash/delime switch will operate only during the wash cycle.
When this switch is in the ON position, the machine stays in the wash cycle until the
switch is OFF. After switching to OFF, the machine will finish the cycle.

4. After 2-1/2 to 3 minutes (or as long as required), turn off the EXTENDED WASH/

DELIME switch. The machine will finish a complete cycle.

5. Complete two cycles with the machine empty to purge the machine of all delime chemicals.

6. Deliming is complete.

!

12

MAINTENANCE

Maintenance Schedule

• As Required

1. Check the temperature gauge reading.

2. Check the chemical supplies and refill as necessary.

• Weekly

1. Inspect all water lines for leaks and tighten them at joints if required.

2. Clean all detergent residue from the exterior of the machine.

3. Check the drain for leaks.

4. Clean accumulated scale from the heating element.

5. Remove and closely inspect each spray arm for blockage.

6. Check for damage to the scrap screen. Ineffective screening can cause wash system

failures.

7. Clean the detergent, sanitizer, and rinse aid supply tubes. Complete the following

procedure:

a. Remove the detergent, sanitizer, and rinse aid pick-up tube(s) from the

container(s). Place the tube(s) into a container of hot water.

b. Depress and hold the DET prime switch (located on the front panel) until clear

water enters the tank through the fill air gap (located on the right side of the
tank).

c. If your machine is equipped with a sanitizer and/or rinse aid pump, follow the

same procedure by pressing the SANITIZER and/or the RINSE AID prime
switch until clear water enters the tank through the fill air gap.

d. When completed, remove the pickup tubes from the hot water and reinsert them

into the correct chemical containers. Repeat the priming procedures to ensure
that chemicals have filled the tubes for the next operating period.

e. Run a complete cycle to flush chemicals from the tank.

13

TROUBLESHOOTING

TROUBLESHOOTING

Before determining any specific cause of a breakdown or abnormal operation of your dishwasher,
check that:

1. Turn all switches ON, except for the extended wash switch.

2. Wash arms are clean.

3. Scrap screen is properly positioned and clean.

4. Thermostat(s) are at their correct setting.

5. Sanitizer, detergent, and rinse additive dispensers are adequately filled.

6. All plumbing valves are open.

If a problem still exists, use the following table for troubleshooting.

CONDITION CAUSE SOLUTION

Machine will not start Door not closed and latched ................ Make sure door is fully latched

Main switch off, or unit unplugged .... Check disconnect or plug into outlet

Make sure the extended wash switch is in
the OFF position.

Low or no water Main water supply is turned off ......... Turn on house water supply

Chemical not feeding No chemical in container..................... Replace or fill container

Feed tubes to/from chemical ............... Clear obstruction and flush

pump clogged with hot water

Screen on feed tube clogged................ Clean and replace

Tubing kinked or split ......................... Straighten or replace tubing

Water temperature Incoming water temperature................ Raise temperature to

is low when in use at machine too low 60°C/140°F for all machines

Hi limit tripped Reset hi limit

Insufficient pumped spray Clogged spray arm .............................. Clean

pressure Scrap screen full .................................. Must be kept clean and in place

Low final rinse temperature Low incoming water............................ Check the booster - be sure the

temperature thermostat is set to maintain 66°C/180°F

temperature (501LT is 60°C/140°F)
(Check all valves to be
sure they are clean and operating)

Hi limit tripped Reset hi limit

Poor washing results Water level low in wash tank .............. Check fill valve and water pressure

should be at or 1/2" (13mm)
above screen

Detergent dispenser not....................... Contact service agent

operating properly

Insufficient detergents ......................... Check and fill

Contact detergent supplier

Detergent setting too low ................... Contact detergent supplier

Wash water temperature too low......... See above booster temperatures

Wash arm clogged .............................. Clean wash arm

Improperly scraped dishes................... Check scraping procedures

Ware being improperly........................ Use proper racks - do not overload

placed in rack racks

Improperly cleaned ............................. Unclog wash arms to maintain

equipment proper pressure and flow conditions

Electric element has ............................ Clean and delime

soil/lime buildup

14

TROUBLESHOOTING

TROUBLESHOOTING (con’t)

CONDITION CAUSE SOLUTION

No water in wash well Opening door prior .............................. Close door. Wait for green cycle light

to cycle completion to go out before opening door.

No water in wash tank Door not latched .................................. Latch door.

after activating the Wait for wash tank to fill.
ON/FILL switch

Cycle time increases Incoming water.................................... Raise temperature to 60°C/140°F

with each cycle temperature is too low for all machines.

15

REPLACEMENT PARTS

REPLACEMENT

PARTS

16

REPLACEMENT PARTS

Figure 1 — Track and Panel Assembly

14

11

14

14

13

00001

12

9

8

6

7

4

5

3

2

10

1

17

REPLACEMENT PARTS

TRACK/PANEL ASSEMBLY

Fig. 1 Part Description Qty
Item No. No.

1 0508751 Screw, 10-32 x 1-1/2" Lg. Truss Head ....................................... 2

2 0308615 Front Panel (HT, HTN, LT) (Prior to S/N 6795) ........................ 1

2 0308646 Front Panel (HT, HTN, LT) (S/N 6795 and above).................... 1

3 0308646 Front Panel (UTL, UT, UT-LC) ................................................. 1

4 0308748 Front Panel (UT-MC) ................................................................. 1

5 0501413 Screw, 10-32 x 3/8" Lg. Round Head......................................... 2

6 0501415 Screw, 10-32 x 5/8" Lg. Round Head......................................... 4

7 0308632 Track, RH ................................................................................... 1

8 0308631 Track, LH ................................................................................... 1

9 0708647 Cover, Vent ................................................................................. 2

10 0308736 Panel, LH Side (UT, UTL, UT-LC, HT, HTN, LT) .................... 1

11 0308734 Panel, Rear (UTL, UT-LC, HT, HTN, LT) ................................. 1

12 0308737 Panel, RH Side (UT, UTL, UT-LC, HT, HTN, LT).................... 1

13 0308735 Panel, Top (UT, UTL, UT-LC, HT, HTN, LT) ........................... 1

14 0501412 Screw, 10-32 x 3/8" Lg. Truss Head (UT, UTL, UT-LC)........... 10

18

REPLACEMENT PARTS

Figure 2 — Door Switch Assembly

4

00020

11

1

5

8

7

6

10

12

9

3

1

13

14

2

1

18

15

16

17

15

19

REPLACEMENT PARTS

DOOR & SWITCH ASSEMBLY

(For Machines Beginning with S/N 6984 and Above)

Fig. 2 Part Description Qty
Item No. No.

1 0501412 Screw, 10-32 x 3/8" Truss Head ................................................. 6

2 0308596 Plate, Door Latch........................................................................ 1

3 0308597 Handle, Door Latch .................................................................... 1

4 0508721 Retaining Ring, Plunger ............................................................. 1

5 0709462 Assembly, Door Catch (Includes items 4, 6) .............................. 1

6 0509436 Plunger, Door Catch ................................................................... 1

7 0508545 Gasket, Steam ............................................................................. 2

8 104883 Screw, Round Head (6-32 x 3/8")............................................... 2

9 0709431 Plate, Door Switch...................................................................... 1

10 111090 Switch, Door Magnetic Reed ..................................................... 1

11 0508544 Gasket, Upper Door.................................................................... 1

12 0508543 Gasket, Side Door....................................................................... 2

13 0501539 Nut, Plain 1/4-20 ........................................................................ 2

14 0503715 Spring, Door Hinge .................................................................... 2

15 0501421 Bolt, 1/4-20 x 1-1/4" Hex Head.................................................. 4

16 0708564 Arm, Door Hinge........................................................................ 2

17 0501501 Washer, Lock 1/4" Split ............................................................. 2

18 0708527 Door............................................................................................ 1

- 0508555 Wiring, Harness, Door Switch.................................................... 1

- 0708526 Door Assy. (includes items 1-6, 18)

For machines built prior to S/N 6984 order Door Switch Conversion Kit, P/N 0709427.

20

REPLACEMENT PARTS

Figure 3 — Tank Heat and Drain

00004

1

3

2

3

TO RINSE

21

19

4

18

17

16

19

14

15

14

13

11

16

11

19

10

20

5

6

7

12

THERMOSTAT
(CALLED OUT IN
CONTROL BOX)

TO PUMP

DRAIN

THERMOMETER
(CALLED OUT IN
CONTROL BOX)

TO DRAIN

8

9

21

REPLACEMENT PARTS

TANK HEAT/DRAIN ASSEMBLY

Fig. 3 Part Description Qty
Item No. No.

1 0508628 Scrap Screen............................................................................... 1

2 0508536 Heater Element 220V-60Hz-1PH (HT, UT, UT-LC).................. 1

3 0508537 Heater Element 110V-60Hz-1PH (HTN, LT, UTL) ................... 1

4 0508578 Adapter, Pump Tube................................................................... 1

5 0501539 Nut, Plain 1/4-20 ........................................................................ 2

6 0501501 Washer, Lock, 1/4" Split............................................................. 2

7 0308611 Support, Drain Valve .................................................................. 1

8 0306618 Valve, Drain................................................................................ 1

9 0501418 Screw, 1/4-20 x 1/2" Lg. Round Head ....................................... 2

10 0508873 Adapter, Thermostat................................................................... 1

11 0501836 O-Ring, Thermostat.................................................................... 2

12 0508872 Adapter, Thermometer ............................................................... 1

13 108954 Nut, Grip 6-32 w/Nylon Insert ................................................... 2

14 110562 Thermostat, High-Limit ............................................................. 1

15 201029 Locknut, 1/2 NPT Nickel-Plated................................................ 2

16 0308655 Tube, Pump Outlet ..................................................................... 1

17 0508579 Nut, Jam 1"-8 ............................................................................. 1

18 104414 O-Ring........................................................................................ 1

19 0510082 Clamp, Hose ............................................................................... 2

20 0507265 Hose, 5/8" ID x 7/8" OD PVC Braided...................................... A/R

21 0509302 Hose, 5/8" ID x 1" OD PVC Braided......................................... 6 Ft.

22

REPLACEMENT PARTS

Figure 4 — Pump Assembly

00005

1

2

3

4

5

6

7

8

11

9

10

13

14

12

TANK
BOTTOM

23

REPLACEMENT PARTS

PUMP ASSEMBLY

Fig. 4 Part Description Qty
Item No. No.

1 0508542 Spindle, Lower Wash Arm ......................................................... 1

2 0501431 Screw, 8-32 x 1-1/8" Round Head.............................................. 4

3 0501425 Screw, 8-32 x 5/8" Round Head ................................................. 4

4 0508793 Housing, Diffuser ....................................................................... 1

5 0502741 Diffuser....................................................................................... 1

6 0502704 Impeller ...................................................................................... 1

7 0502746 Adapter Plate, Suction................................................................ 1

8 0502745 Plate, Drain lnlet......................................................................... 1

9 0502703 O-ring ......................................................................................... 1

10 0502744 Propeller/Rotating Seal Assembly ............................................. 1

11 0502743 Mounting Plate/Seal Assembly (Includes Item 10).................... 1

12 0501881 Gasket, Pump ............................................................................. 1

13 0508665 Screw, 10-32 x 5/8" Hex Washer Head ...................................... 8

14 0508570 Washer, Sealing Teflon............................................................... 8

- 0710071 Pump/Motor Assembly (lncludes items 1-11)* ......................... 1

- 107966 Nut, Grip 10-32, SST (Not Shown) (For mounting Item 1)....... 1

* Motor not available as a separate repair part

FROM
PUMP

TANK BOTTOM

PUMP

2

14

TOP OF

HOOD

13

12

11

10

9

10

8

7

6

5

4

3

2

1

00006

24

REPLACEMENT PARTS

Figure 5 — Wash System Assembly

25

REPLACEMENT PARTS

WASH SYSTEM ASSEMBLY

Fig. 5 Part Description Qty
Item No. No.

1 0508549 Hose, Upper Wash ...................................................................... 1

2 0502563 Clamp, Hose 1"........................................................................... 2

3 0708650 Spindle, Upper Wash Arm.......................................................... 1

4 0503588 O-ring, 1-1/8" x 1-3/8" ............................................................... 1

5 0501412 Screw, 10-32 x 3/8" Lg. Truss Head........................................... 3

6 0508541 Bushing, Upper Wash Arm......................................................... 1

7 0705047 Wash Arm, Upper ....................................................................... 1

8 0505042 Pivot, Upper Wash Arm.............................................................. 1

9 0308783 Retainer, Upper Pivot S/A .......................................................... 1

10 0501563 Screw, #8 x 3/8" (Sheet Metal) Truss Head................................ 4

11 0308158 Nut Clip, Spray Arm................................................................... 1

12 0501684 Nut, Spray Arm Lock ................................................................. 1

13 0705049 Wash Arm, Lower....................................................................... 1

14 0508540 Bushing, Lower Wash Arm ........................................................ 1

- 0708874 Lower Wash Arm Assembly (includes items 10-14)

26

REPLACEMENT PARTS

Figure 6 — Water Inlet Piping

10

11

7

13

16

00021

16

WATER

2

CONNECTION

15

12

9

WATER
CONNECTION

6

5

2

7

8

4

3

1

2

TO BOOSTER

OR FILL

27

REPLACEMENT PARTS

WATER INLET PIPING ASSEMBLY

Fig. 6 Part Description Qty
Item No. No.

1 0503718 Foot, Adjustable ......................................................................... 4

2 0503679 Clamp, Hose ............................................................................... 2

3 107417 Hose l/2" I.D. (all except HTN) ................................................. A/R

4 107417 Hose 1/2" I.D. (HTN)................................................................. A/R

5 0502653 Elbow, 3/8 MPT x 1/2" Hose x 90° Brass .................................. 1

6 0504952 Valve, Solenoid 3/8 NPT ............................................................ 1

- 0502811 Repair Kit, 3/8" NPT Solenoid Valve......................................... 1

- 0505235 Coil, 115V, 3/8" NPT Solenoid Valve ........................................ 1

- 0504958 Flow Washer, 3/8" NPT Solenoid Valve .................................... 1

7 0501501 Washer, Lock 1/4" Split.............................................................. 4

8 0501419 Bolt, 1/4-20 x 1/2" Lg. Hex Head .............................................. 2

9 0300203 Clamp, Valve Support ................................................................ 1

10 0300065 Support, Fill Valve...................................................................... 1

11 0501424 Bolt, 1/4-20 x 3/8" Lg. Hex Head .............................................. 2

12 0503713 Elbow, Street 3/8 MPT x 1/2 FPT Brass (HT, HTN, LT)........... 1

(Prior to S/N 6795)

13 0502618 Coupler, 3/8 MPT x 1/2" Hose barb........................................... 1

14 0503679 Clamp, Hose ............................................................................... 1

15 0509526 Hose, Coupled 7 ft...................................................................... 1

16 0505320 Washer, Hose.............................................................................. 1

28

REPLACEMENT PARTS

Figure 7 — Fill SystemFigure 7 — Fill System

00018

1

10

2

2

3

4

3

Beginning with S/N 5733 & Above

4

From Top of

Booster or

From Fill Valve

RH Side

5

of Tank

9

3

4

(See Corresponding Pump For Hose)

From

Sanitizer

Rinse-aid

Pumps

From Detergent Pump

6

4

7

8

Prior to S/N 5733

29

REPLACEMENT PARTS

FILL SYSTEM

All Models

Fig. 7 Part Description Qty
Item No. No.

1 107417 Hose, 1/2" I.D. (HT, LT, UTL)................................................... A/R

2 0501518 Tie Wrap, Hose........................................................................... 2

3 106090 Bracket, Tie Wrap ...................................................................... 2

4 107966 Nut, Grip, 10-32 w/Nylon Insert ................................................ 8

5 0509048 Gasket, Inlet Chute (Beginning with S/N 5733 & above).......... 1

6 0508867 Inlet Chute (Beginning with S/N 5733 & above)....................... 1

7 0508656 Gasket, Inlet Chute (Prior to S/N 5733)..................................... 1

8 0508609 Inlet Chute (Prior to S/N 5733) .................................................. 1

9 0501519 Tie Wrap, Chemical Hose .......................................................... 3

10 107417 Hose, Flll 1/2" I.D. (White) (all except HT, LT, UTL)............... 3 ft.

30

REPLACEMENT PARTS

Figure 8 — Booster Assembly

00017

(CALLED OUT

IN CONTROL BOX)

THERMOSTAT

15

16

15

6

13

14

12

23

24

23

26

3

1

10

2

FROM FILL VALVE

TO FILL SYSTEM

25

17

3

1

4

7

4

8

11

9

5

6

22

21

18

20

19

18

31

REPLACEMENT PARTS

BOOSTER ASSEMBLY

(Includes Models HT, UT, UT-LC)

Fig. 8 Part Description Qty
Item No. No.

1 0503679 Clamp, Hose ............................................................................... 2

2 107417 Hose, 1/2" I.D. (42") .................................................................. 3 ft.

3 0502653 Elbow, 3/8 MPT x 1/2" Hose x 90° Brass .................................. 2

4 0508840 Bushing, Reducing 3/4 NPT x 3/8 NPT Brass ........................... 2

5 0501419 Bolt, 1/4-20 x 1/2" Lg. Hex Head .............................................. 2

6 0501501 Washer, Lock 1/4" Split.............................................................. 5

7 108954 Nut, Grip 6-32 w/Nylon lnsert ................................................... 2

8 110562 Thermostat, High Limit.............................................................. 1

9 0508779 Tank, Booster (Prior to S/N 5713).............................................. 1

9 0509042 Tank, Booster (Beginning with S/N 5713 and above)................ 1

10 107417 Hose 1/2" I.D. (28") ................................................................... A/R

11 0508709 Pipe Plug, 1/8 NPT Brass........................................................... 1

12 109985 O-Ring........................................................................................ 1

13 111233 Heater Element, 9KW (70° Rise) 208/230V-60Hz-1Ph............. 1

14 111235 Heater Element, 6KW (40° Rise) 208/230V-60Hz-lPh.............. 1

15 0501539 Nut, Plain 1/4-20 ........................................................................ 6

16 107908 Cover, Heater Element ............................................................... 1

17 0308638 Body, Junction box ..................................................................... 1

18 0501533 Nut, Plain 10-32 Brass ............................................................... 2

19 0501472 Washer, Flat #10 Brass............................................................... 2

20 0501493 Washer, Lock #10 Ext. Tooth Brass ........................................... 1

21 0501403 Screw, 10-32 x 3/4" Lg. Round Head Brass............................... 1

22 107964 Bushing, Snap............................................................................. 1

23 0501412 Screw, 10-32 x 3/8" Lg. Truss Head........................................... 4

24 0504538 Screw, 10-32 x 3/8" Lg. Truss Head Steel.................................. 2

25 0504951 Terminal Block ........................................................................... 1

26 0308627 Cover, Junction Box ................................................................... 1

- 110997 Wire, Jumper, Heater Element (Not Shown).............................. 1

- 0307356 Insulation, Heater Terminal (Not Shown) .................................. 1

- 0508397 Label, Cover Warning (Not Shown)........................................... 1

32

REPLACEMENT PARTS

Figure 9 — Detergent Pump Assembly

1

3

2

4

6

7

8

5

9

10

11

16

17

18

12

13

16

22

00022

14

15

TO FILL

ASSY

22

19

20

21

TO DETERGENT

SUPPLY

33

REPLACEMENT PARTS

DETERGENT PUMP ASSEMBLY

All Models

Fig. 9 Part Description Qty
Item No. No.

1 0503757 Motor, Pump............................................................................... 1

2 0308637 Bracket, Detergent Pump (all except LT) ................................... 1

3 0308610 Bracket, Detergent/Sanitizer Pumps (LT) .................................. 1

4 N/A Screw, M4 x 35mm Hex Head ................................................... 4

5 0501412 Screw, 10-32 x 3/8" Lg. Truss Head........................................... 2

6 N/A Housing, Pump ........................................................................... 1

7 0501497 Washer, Lock #8 Split ................................................................ 2

8 0504822 Screw,8-32 x 1/2" Lg. Pan Head ................................................ 2

9 0501425 Screw, 8-32 x 5/8" Round Head ................................................. 2

10 N/A Screw, Set M6 x 8mm ................................................................ 1

11 N/A Rotor Assembly.......................................................................... 1

12 108194 Hose, Pump ................................................................................ 1

13 N/A Cover, Pump Housing ................................................................ 1

14 N/A Washer, Flat M4 ......................................................................... 4

15 N/A Nut, Wing M4............................................................................. 4

16 0501519 Tie Wrap, Hose........................................................................... 2

17 0502667 Hose, Detergent, 1/4" I.D. PVC (Clear)..................................... A/R

18 0502644 Elbow, 1/4" O.D. x 90° Barbed .................................................. 2

19 0503695 Label, Detergent ......................................................................... 1

20 0306363 Tube, Pick-Up ............................................................................ 1

21 0501869 Strainer, Pick-Up Tube ............................................................... 1

22 0501519 Tie Wrap, Hose........................................................................... 2

- 109829 Pump Head Assy. (includes items 4, 6, 10-15)

- 0708559 Pump/Motor Assy. (includes items 1, 2, 4, 6-16, 18)

34

REPLACEMENT PARTS

Figure 10 — Sanitizer/Rinse Aid Pump Assembly

00002

1

3

2

5

6

7

4

15

10

DETERGENT
PUMP (SEE FIG. 9)

TO FILL
SYSTEM

11

13

14

TO CHEMICAL SUPPLY

8

9

10

12

35

REPLACEMENT PARTS

SANITIZER/RINSE AID PUMP

LT/UTL

Fig. 10 Part Description Qty
Item No. No.

1 0503756 Motor, Pump............................................................................... 1

2 0308610 Bracket, Detergent/Sanitizer Pump (LT) .................................... 1

3 0308697 Bracket, Rinse-Aid Pump (Optional) ......................................... 1

4 0501412 Screw, 10-32 x 3/8" Lg. Truss Head........................................... 2

5 0501497 Washer, Lock #8 Split ................................................................ 4

6 0504822 Screw, 8-32 x 1/2" Lg. Pan Head ............................................... 4

7 0707142 Rotor Assy.................................................................................. 1

8 0706635 Element Tube Assy (45cc/min).................................................. 1

9 0506589 Screw, 6-32 x 7/8" Lg. Pan Head ............................................... 2

10 0502666 Hose, 1/8" I.D. PVC (Clear)....................................................... A/R

11 0503694 Label, Sanitizer (LT) .................................................................. 1

12 0505483 Label, Rinse-Aid (Optional)....................................................... 1

13 0306363 Tube, Pick-Up ............................................................................ 1

14 0501869 Strainer, Pick-up Tube................................................................ 1

15 0501519 Tie Wrap, Hose........................................................................... 2

- 0708561 Detergent/Sanitizer Pump Assy. (LT)......................................... 1

(lncludes Detergent Pump and Items 1,2, 5-9)

- 0708754 Rinse-Aid Pump Assy. (Optional)
(Includes Items 1,3-10, 12-15)

36

REPLACEMENT PARTS

Figure 11 — Drain Pump Assembly

00003

1

2

3

TO DRAIN

11

12

FROM
DRAIN
VALVE

12

11

10

13

14

5

6

7

8

9

4

37

REPLACEMENT PARTS

DRAIN PUMP ASSEMBLY

501 UTL, UT-LC

Fig. 11 Part Description Qty
Item No. No.

1 0308119 Bracket, Pump Hold Down ........................................................ 1

2 0501419 Bolt, 1/4-20 x 1/2" Lg. Hex Head .............................................. 2

3 0501501 Washer, Lock 1/4" Split.............................................................. 2

4 N/A Motor, Pump............................................................................... 1

5 N/A Backing Plate, Pump .................................................................. 1

6 0508370 Gasket, Pump Volute .................................................................. 1

7 0508369 Impeller, Pump ........................................................................... 1

8 0508368 Volute, Pump .............................................................................. 1

9 N/A Screw, 10-24 x 1-5/8" Lg. Pan Head .......................................... 3

10 0508141 Adapter, 3/4 MPT x 1/2" Hose Barb PVC ................................. 1

11 0507265 Hose, 5/8" I.D. x 7/8 O.D., Braided ........................................... A/R

12 0503679 Clamp, Hose ............................................................................... 2

13 0508139 Coupling, 1/2" NPT PVC........................................................... 1

14 0508140 Elbow, 1/2 MPT x 1/2" Hose Barb x 90° PVC .......................... 1

- C35065 Drain Pump Assy. (Includes Items 4-9) (UTL, UT-LC)

38

REPLACEMENT PARTS

Figure 12 — Control Cabinet

39

REPLACEMENT PARTS

CONTROL CABINET ASSEMBLY

HT, HTN, LT, UTL, UT, UT-LC

Fig. 12 Part Description Qty
Item No. No.

1 113622 Thermometer, 4 Ft. Gas Filled (Replaces 108391) .................... 1

2 0508551 Lamp, Green............................................................................... 1

3 0508552 Decal, Control Panel (All except LT, UTL) ............................... 1

4 0508553 Decal, Control Panel (LT, UTL) ................................................. 1

5 0708635 Control Panel.............................................................................. 1

6 0501361 Switch, Rocker (All except LT, UTL) ........................................ 2

7 0501361 Switch, Rocker (LT, UTL).......................................................... 1

8 0501369 Switch, Rocker, Spring-Return (All except LT, UTL) ............... 1

9 0501369 Switch, Rocker, Spring Return (LT, UTL) ................................. 2

10 0504911 Screw #6 x 1/4" Lg. (Sheet Metal) Pan Head............................. 6

11 0504956 Motor, Timer .............................................................................. 1

12 0501379 Switch,Timer (All except LT, UTL)........................................... 8

13 0501379 Switch, Timer (LT, UTL) ........................................................... 9

14 0708538 Timer Assy (includes items 11, 12, 38) (HT, HTN)................... 1

15 0708590 Timer Assy (includes items 11, 13, 38) (LT) ............................. 1

16 0708590 Timer Assy (includes items 11, 13, 38) (UTL) .......................... 1

17 0708538 Timer Assy (includes items 11, 12, 38) (UT, UT-LC) ............... 1

18 0501373 Switch, Toggle, 3 Position (all except HTN, LT, UTL) ............. 1

19 107964 Bushing, Snap............................................................................. 2

20 0508554 Contactor, 2 Pole, 50 AMP (240V) (all except HTN, LT, UTL) 1

21 0308641 Cover, Contactor (all except HTN, LT, UTL) ............................ 1

22 0503749 Terminal Block........................................................................... 1

23 0501358 Relay, Start ................................................................................. 1

**24 109069 Thermostat, Booster w/Capillary (All except HTN, LT, UTL).. 1

25 0300096 Bracket, Tank Heat, Thermostat................................................. 1

26 0501380 Thermostat, Tank Heat, w/Capillary Wash Tank........................ 1

27 0708525 Control Box ................................................................................ 1

28 0501412 Screw, 10-32 x 3/8" Lg. Truss Head........................................... 11

29 0503648 Screw, 8-32 x 1/4" Lg. Pan Head ............................................... 4

30 0501463 Screw, 8-32 x 1" Lg. Round Head.............................................. 1

31 0501450 Screw, 6-32 x 1/4" Lg. Round Head........................................... 2

32 0501403 Screw, 10-32 x 3/4" Lg. Round Head Brass............................... 1

33 0501493 Washer, Lock #10 Ext. Tooth ..................................................... 1

34 0501472 Washer, Flat #10 Brass .............................................................. 2

35 0501533 Nut, Plain 10-32 Brass ............................................................... 2

36 0508572 Label, Cam (all except LT, UTL) ............................................... 1

37 0508589 Label, Cam (LT, UTL)................................................................ 1

40

REPLACEMENT PARTS

CONTROL CABINET ASSEMBLY (cont’d)

HT, HTN, LT, UTL, UT, UT-LC

Fig. 12 Part Description Qty
Item No. No.

38 0503701 Bearing, Timer Shaft .................................................................. 1

- 0501292 Power Cord (HTN, LT, UTL) (Not Shown) ............................... 1

39 112185 Bracket, Ranco thermostat ......................................................... 1

40 — Sheetmetal screw (#8 x 3/16") ................................................... 2

41 — Screw (6/32 x 1/4") .................................................................... 2

42 0309433 Bracket, Relay ............................................................................ 1

43 0509428 Relay (15A, 120VAC) ................................................................ 1

44 0501408 Screw (8-32 x 1/4") .................................................................... 2

45 0501538 Nut, (8-3/2 Hex) ......................................................................... 2

46 0508572-1 Label, Cam Adjust (After S/N W7604) ..................................... 1

47 111069 Relay 2 PDT 10 Amp 240 VAC (After S/N W7604) ................. 1

48 0501412 Screw 10-32 x 3/8 Truss Slot SST (After S/N W7604) ............. 2

49 0710583 Timer Assy (includes items 11, 12, 28)

(HT models only) (After S/N W7604) ....................................... 1

50 0308641-1 Electric Box Divider RS (After S/N W7604)............................. 1

- 0508556 Wire Harness (For Timer Assy 0708538 and 0708590)

- 0510619 Wire Harness (For Timer Assy 0710583)

41

ELECTRICAL SCHEMATICS

ELECTRICAL

SCHEMATICS

42

ELECTRICAL SCHEMATICS

Figure 13 - Electrical Diagram, 501-HT

(For machines Beginning with S/N W7604)

43

ELECTRICAL SCHEMATICS

Figure 14 - Electrical Diagram, 501-HT
(For machines Ranging from S/N 6984)

44

ELECTRICAL SCHEMATICS

Figure 15 - Electrical Diagram, 501-HTN

(For machines beginning with S/N 6984)

45

ELECTRICAL SCHEMATICS

Figure 16 - Electrical Diagram, 501-LT

(For machines beginning with S/N 6984)

46

ELECTRICAL SCHEMATICS

Figure 17 - Electrical Diagram, 501-HT (50 Hz)

32

38

32

2

NO

NC

NO

NC

NO

NC

5

32

3

SS

MSW

35

CAM 8

115 VAC

COIL

TO CUSTOMER DISCONNECT SWITCH

230V

1

5

1

GND

2

4

35

5

33

5

6

7

CAM 1

NO

NC

4

NO

NC

1CR

PSDR

16

4

17

34

27

NO

39

NC

NC

40

NO

9

5

FUSE

32

CT

NO

28

BOOSTER TANK

WTS

EC/D

NO

24

NC

NC

26

NO

NO

CAM 2

24

NC

26

16

36

XFMR

37

2

1

CTC

NO

NC

NC

29

BHTR

30

HLTS

WTS

88

27

9

26

8

16

8

38

115 VAC

33

31

31

10

SRC

NO

CAM 5

NC

NO

CAM 4

NC

NO

CAM 7

NC

33

3

HLTS

12

15

20

21

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.

3

11

WHTR

13

14

15

3

1

2

3

4

5

BLU

RED

BLK

WHT

GRN

3

START CW

START CCW

MAIN

TP

GND

TM

WASH/
/RINSE

DRAIN

3

40

3

GND

3

3

8

NO

CAM 3

NC

19

F V

(IF USED)

DP

20

D V

DM

CLT

00010

3

3

BHTR BOOSTER HEATER
BLK BLACK
BLU BLUE
CAM 1 HOMING
CAM 2 PUMP MOTOR

PUMP MOTOR REVERSING

CAM 3
CAM 4 DRAIN
CAM 5 FILL

CAM 6 RINSE
CAM 7 DETERGENT
CAM 8 CYCLE
CLT CYCLE ON LIGHT

17

CT CONTACTOR

CTC CONTACTOR COIL
DM DETERGENT MOTOR
DP DRAIN PUMP (IF USED)
DSS DOOR SAFETY SWITCH
DV DRAIN VALVE
EC/D EXTENDED CYCLE/DELIME
FV FILL VALVE

GND GROUND
GRN GREEN

17

CAM 6

8

NO

NC

(IF USED)

22

RM

PSDR
1CR RELAY
RM RINSE MOTOR (IF USED)
SRC CURRENT OPERATED START RELAY COIL
SS SERVICE SWITCH
TM TIMER MOTOR
TP THERMAL PROTECTOR
WHT WHITE
WHTR WATER HEATER

WTS WATER THERMOSTAT
HLTS HIGH LIMIT THERMOSTAT
MSW

MAIN SWITCH ON/FILL OFF/DRAIN

DSS

38

3

PRIME SWITCH DETERGENT, RINSE

1CR

0508975/A

47

ELECTRICAL SCHEMATICS

Figure 18 - Electrical Diagram, 501-HT/UT/UTLC

(For machines built prior to S/N 6984)

2

1

SS

25

5

TO CUSTOMER DISCONNECT SWITCH

1

2

3

GND

2

1

33

NC

NC

29

28

31

3

31

33

3

WHTR

11

10

88

3

CLT

24

4

33

4
6

7

NC

35

4

4

35

32

4

34

16

17

27

9

25

25

SRC

8

TM

1

2

3

3

3

4

5

TP

3

3

3

3

3

15

14

13

WASH

DP

F

V

19

20

20

8

16

26

26

16

25

17 17

8

8

DM

RM

D

V

3

3

115V NEUTRAL

230V

MSW

21

22

CUSTOMER TO SUPPLY RATED VOLTAGE/PHASE/Hz, AS SPECIFIED

PER ORDER, TO DISCONNECT SWITCH.

WITH ALL LOCAL ELECTRICAL CODES.

ALL POWER SUPPLIED TO EACH CONNECTION POINT MUST COMPLY

HLTS HIGH LIMIT THERMOSTAT

DM DETERGENT MOTOR

DV DRAIN VALVE

DP DRAIN PUMP (IF USED)

FV FILL VALVE
GND GROUND
GRN GREEN

EW/D EXTENDED WASH/DELIME

DS DOOR SWITCH

CT CONTACTOR
CTC CONTACTOR COIL

MSW

MAIN SWITCH ON/FILL OFF/DRAIN

CAM 7 DETERGENT
CAM 8 AUTO-FILL DRAIN

CLT CYCLE ON LIGHT

CAM 1 HOMING
CAM 2 PUMP MOTOR
CAM 3 PUMP MOTOR REVERSING
CAM 4 DRAIN
CAM 5 FILL
CAM 6 RINSE

BLK BLACK
BLU BLUE
BTS BOOSTER THERMOSTAT

BHTR BOOSTER HEATER

WHTR WATER HEATER

TM TIMER MOTOR

SRC CURRENT OPERATED START RELAY COIL

TP THERMAL PROTECTOR

RM RINSE MOTOR (IF USED)

WHT WHITE

PSDR PRIME SWITCH DETERGENT, RINSE

SS SERVICE SWITCH

TTS TANK HEAT THERMOSTAT

00011

48

ELECTRICAL SCHEMATICS

TO CUSTOMER RECEPTACLE

115V 60Hz

BLK WHT

GND

1

2

CLT

TM

6

7

8

8

8

NC

NC

CAM 1

TTS 10

13

2

2

2

BLU

START

CW

3

RED

START

CCW

MAIN

BLK

WHT

GRN

DP

CAM

CAM

D

V

SRC

9

9

15

12

15

2

2

2

2

WHTR

20

2

9

24

1

8

8

NC

1

8

8

17

16

21

CAM

CAM

DM

RM

(IF USED)

2

2

NC

NC

5

4

3

2

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.

HLTS HIGH LIMIT THERMOSTAT

RM RINSE MOTOR (IF USED)

DM DETERGENT MOTOR

DV DRAIN VALVE

DP DRAIN PUMP (IF USED)

DS DOOR SWITCH

FV FILL VALVE
GND GROUND
GRN GREEN

PSDR PRIME SWITCH DETERGENT, RINSE

EW/D EXTENDED WASH/DELIME

MSW

MAIN SWITCH ON/FILL OFF/DRAIN

CAM 7 DETERGENT

CLT CYCLE ON LIGHT

CAM 8 AUTO-FILL DRAIN

CAM 1 HOMING
CAM 2 PUMP MOTOR
CAM 3 PUMP MOTOR REVERSING
CAM 4 DRAIN
CAM 5 FILL
CAM 6 RINSE

BLK BLACK
BLU BLUE
BTS BOOSTER THERMOSTAT

TM TIMER MOTOR

SRC

CURRENT OPERATED START RELAY COIL

TP THERMAL PROTECTOR
TTS TANK HEATER THERMOSTAT

WHTR WATER HEATER

WHT WHITE

00012

Figure 19 - Electrical Diagram, 501-HTN

(For machines built prior to S/N 6984)

49

ELECTRICAL SCHEMATICS

Figure 20 - Electrical Diagram, 501-LT/UTL

(For machines built prior to S/N 6984)

00013

TO CUSTOMER RECEPTACLE

3

4

5

8

8

7

8

115V 60 Hz

BLK WHT

9

8

8

GND

2

9

9

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.

TTS 10

3

8

CLT

88

12

19

20

20

15

TM

13

14

15

3

V

F

DP

V

D

2

2

2

2

4

5

11

2

2

2

TP

BLK BLACK
BLU BLUE
BTS 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

16

8

17

8

18

8

CAM 9 AUTO-FILL DRAIN

CLT CYCLE ON LIGHT
DM DETERGENT MOTOR
DP DRAIN PUMP (IF USED)
DS DOOR SWITCH

DV DRAIN VALVE
FV FILL VALVE
GND GROUND
GRN GREEN
HLTS HIGH LIMIT THERMOSTAT
MSW

MAIN SWITCH ON/FILL OFF/DRAIN

DM

(IF USED)

RM

SM

PSDR PRIME SWITCH DETERGENT, RINSE
PSS PRIME SWITCH SANITIZER

ICR RELAY
RM RINSE MOTOR (IF USED)

SRC
SM SANITIZER MOTOR
TM TIMER MOTOR
TP THERMAL PROTECTOR
TTS TANK HEAT THERMOSTAT
WHT WHITE
WHTR WATER HEATER

2

2

2

CURRENT OPERATED START RELAY COIL

Figure 21 - Timer Chart and Diagram, 501-HT

(For machine beginning with S/N W7604)

50

ELECTRICAL SCHEMATICS

TIMING CHART 501HT

TIME IN SECSCAM

HOMING

1

CAM

WASH PUMP

2

FORWARD=WASH

WASH PUMP

2

REVERSE=DRAIN

WASH PUMP
REVERSING CAM

3

DRAIN VALVE

4

5

6

7

8

9

DRAIN PUMP

FILL VALVE

RINSE
PUMP

DETERGENT
PUMP

AUTO-FILL
DRAIN

RINSE
SENTRY

OPTIONAL

OPTIONAL

0

10 20 30 40 50 60 70 80 90 100 110 120 130 140

00014

150

NCN

O

COM.

TIMER
SWITCH
DETAIL

If booster thermostat is calling for heat,
cam 9 will pause wash cycle until it reaches
82∞C/180∞F.

87 654321

9

LOCKING SCREW

SYNCHRON

TIMER MOTOR

TIMER ASSEMBLY 501HT

Figure 22 - Timer Chart and Diagram, 501-HT

(Prior to S/N W7603)

5151

ELECTRICAL SCHEMATICS

TIMING CHART 501HT

0

TIME IN SECSCAM

HOMING

1

CAM

WASH PUMP

2

FORWARD=WASH

WASH PUMP

2

REVERSE=DRAIN
WASH PUMP

REVERSING CAM

3

DRAIN VALVE

4

DRAIN PUMP

FILL VALVE

5

RINSE

6

PUMP

DETERGENT

7

PUMP

AUTO-FILL

8

DRAIN

OPTIONAL

10 20 30 40 50 60 70 80 90 100 110 120 130 140

00014

150

NCN

O

COM.

TIMER
SWITCH
DETAIL

87 654321

LOCKING SCREW

TIMER ASSEMBLY 501HT

SYNCHRON

TIMER MOTOR

5252

ELECTRICAL SCHEMATICS

Figure 23 - Timer Chart and Diagram, 501-UT

TIMING CHART 501UT

TIME IN SECSCAM

HOMING

1

CAM

WASH PUMP

2

FORWARD=WASH

WASH PUMP

2

REVERSE=DRAIN
WASH PUMP

REVERSING CAM

3

DRAIN VALVE

4

DRAIN PUMP

FILL VALVE

5

6

7

8

RINSE
PUMP

DETERGENT
PUMP

AUTO-FILL
DRAIN

OPTIONAL

0

10 20 30 40 50 60 70 80 90 100 110 120 130 140

00015

150

NCN

O

COM.

TIMER
SWITCH
DETAIL

87 654321

LOCKING SCREW

TIMER ASSEMBLY 501UT

SYNCHRON

TIMER MOTOR

5353

ELECTRICAL SCHEMATICS

TIMING CHART 501LT

Figure 24 - Timer Chart and Diagram, 501-LT

0

TIME IN SECSCAM

HOMING

1

CAM

WASH PUMP

2

FORWARD=WASH

WASH PUMP

2

REVERSE=DRAIN
WASH PUMP

REVERSING CAM

3

DRAIN VALVE

4

DRAIN PUMP

FILL VALVE

5

RINSE

6

PUMP

SANITIZER

7

PUMP

DETERGENT

8

PUMP

AUTO-FILL

9

DRAIN

10 20 30 40 50 60 70 80 90 100 110 120 130 140

00016

150

NCN

O

COM.

TIMER
SWITCH
DETAIL

897654321

LOCKING SCREW

TIMER ASSEMBLY 501LT

SYNCHRON

TIMER MOTOR