Installation/Operation Manual with Service Replacement Parts
Undercounter Dishwashers
M4 Series
501HT
High Temperature Wash
Refresh with built-in booster
and Pumped Final Rinse
501HT
501LT
Low Temperature Chemical
Sanitization Wash Refresh
with Pumped Final Rinse
501LT
Issue Date: 2.24.16
Manual P/N 115782 rev. A
For machines beginning with S/N W150350341 and above
3765 Champion Blvd.,
Winston-Salem, NC 27105
(336) 661-1556 Fax: (336) 661-1660
Toll-free: (800) 858-4477
2674 N. Service Road, Jordan Station
Ontario, Canada L0R 1S0
(905) 562-4195 Fax: (905) 562-4618
Toll-free: (800) 263-5798
Printed in the USA
For future reference, record your dishwasher information in the box below.
Model Number__________________________ Serial Number_______________________
Voltage________________Hertz_____________ Phase__________________
Service Agent __________________________________ Tel:______________________
Parts Distributor _________________________________ Tel:______________________
National Service Department
ATTENTION:
In Canada:
The model no., serial no., voltage, Hz
Toll-free: (800) 263-5798
and
phase are needed to identify your
Tel:
(905) 562-4195
machine
and to answer questions.
Fax:
(905) 562-4618
email: service@moyerdiebellimited.com
The machine data plate is located
on the lower front panel.
Please have this information ready
if you call for service assistance.
The USGBC and the CaGBC Member Logos are trademarks owned by the U.S. Green Building Council and The Canadian Green
Building Council, respectively, and are used by permission. The logos signify only that Moyer Diebel is a USGBC member and a
CaGBC member; USGBC and CaGBC do not review, certify nor endorse the products or services offered by its members.
COPYRIGHT © 2016 All rights reserved
Printed in the USA
PRODUCT REGISTRATION
ONLINE
Connect to the internet and enter the URL below to
register your machine.
IN CANADA:
http://www.championindustries.com/canada/register
PRODUCT REGISTRATION
BY FAX
COMPLETE THIS FORM AND FAX TO:
(336) 661-1660 in the USA
1 (800) 204-0109 in Canada
PRODUCT REGISTRATION CARD
Serial #
Model
Date of Installation:
Company Name:
Address:
Telephone #: (
)
---
(Street)
State
or Province
Zip or
Postal Code
Contact:
Installation Company:
Address:
Telephone #:
Contact:
FAILURE TO REGISTER YOUR PRODUCT MAY VOID YOUR WARRANTY
IMPORTANT
IMPORTANT
Revision History
Revision History
A revision might be a part number change, a new instruction, or other information that was
not available at print time. We reserve the right to make changes to these instructions without
notice and without incurring any liability by making the changes. Equipment owners may
request a revised manual, at no charge, by calling 1 (800) 858-4477 in the USA or by
calling 1 (800) 263-5798 in Canada.
Revision
Date
Revised
Pages
Serial Number
Effectivity
Revision
Description
10.9.15 ---W150350341Released First 501HT Edition
W150350281
Released FIrst 501LT Edition
2.24.16
25
W150350341
Revised Varicycle illustration
i
Limited Warranty
LIMITED WARRANTY
Moyer Diebel. (herein referred to as The Company), 3765 Champion Blvd., Winston-Salem, North Carolina 27105, 2674 N.
Service Road, Jordan Station, Canada, L0R 1S0, warrants machines, and parts, as set out below.
Warranty of Machines: The Company 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 The Company, whichever occurs first. [See
below for special provisions relating to glasswashers.] Warranty registration must be submitted to Moyer Diebel within ten (10)
days after installation either online on the Moyer Diebel website (http://www.moyerdiebel.com/register/) in the USA or
http://www.championindustries.com/canada/register in Canada or by fax on the form provided at the front of this manual.
If warranty registration is not returned to The Company within such period, the warranty will expire after one year from the
date of shipment. The Company 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, The Company, at its election, will either repair or replace the defective machine or accept return of the machine for full
credit; provided; however, as to glasswashers, The Company'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 The Company's authorized service technician. Defective parts become the property of The Company. Use of replacement
parts not authorized by The Company will relieve The Company of all further liability in connection with its warranty. In no event
will The Company's warranty obligation exceed The Company's charge for the machine. The following are not covered by The
Company's warranty:
a.
b.
c.
d.
e.
f.
g.
h.
i.
j.
Lighting of gas pilots or burners.
Cleaning of gas lines.
Replacement of fuses or resetting of overload breakers.
Adjustment of thermostats.
Adjustment of clutches.
Opening or closing of utility supply valves or switching of electrical supply current.
Cleaning of valves, strainers, screens, nozzles, or spray pipes.
Performance of regular maintenance and cleaning as outlined in operator’s guide.
Damages resulting from water conditions, accidents, alterations, improper use, abuse, tampering, improper installation, or failure to follow maintenance and operation procedures.
Wear on Pulper cutter blocks, pulse vanes, and auger brush.
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: The Company warrants all new machine parts produced or authorized by The Company 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 The Company will replace the defective part without charge.
DISCLAIMER OF WARRANTIES AND LIMITATIONS OF LIABILITY. THE COMPANY'S WARRANTY
IS ONLY TO THE EXTENT REFLECTED ABOVE. THE COMPANY 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 THE COMPANY'S DISHWASHING MACHINES AND THE COMPANY'S
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.
ii
Table of Contents
Table of Contents
Model 501HT
Revision History......................................................................................................... i
Limited Warranty....................................................................................................... ii
Installation - Model 501HT...................................................................... 1
Receiving - 501HT................................................................................................... 1
Placement - 501HT.................................................................................................. 1
Water Connections - 501HT..................................................................................... 2
Drain Connections - 501HT...................................................................................... 3
Electrical Connections 501HT 1 Phase w/o Booster - 501HT........................................ 6
Electrical Connections 501HT 1 and 3 PH Wiring Diagrams - 501HT............................ 7
Connecting Incoming Power to the Main Terminal Block (1 and 3 PH) - 501HT............... 8
Booster Heater Conversion from 1 to 3 PH - 501HT................................................... 11
Booster Fill Switch - (Filling the booster for the first time) - 501HT.................................. 14
Chemical Connections - 501HT............................................................................... 16
Pumps and Injection Points - Detergent and Rinse-aid Dispensing Pumps - 501HT.................... 17
Pump Priming - Detergent and Rinse-aid Dispensing Pumps - 501HT............................ 19
Fill Adjustments - Detergent and Rinse-aid Dispensing Pumps - 501HT.................................... 21
Operation - Model 501HT.................................................................................. 22
Loading Dish Racks - 501HT................................................................................... 22
Normal Wash Mode - 501HT................................................................................. 24
Varicycle Mode - 501HT........................................................................................ 25
Rinse Sentry Mode - 501HT.................................................................................... 26
Drain Mode - 501HT............................................................................................. 26
Cleaning - Model 501HT........................................................................ 28
Cleaning the Wash Tank - 501HT............................................................................ 28
Cleaning the Wash Arms - 501HT........................................................................... 29
Cleaning Scrap Screen and Sump Strainer - 501HT.................................................. 31
Deliming - Model 501HT........................................................................................ 32
Maintenance - Model 501HT................................................................... 34
Daily, Weekly, Monthly.......................................................................................... 34
(continued on next page)
iii
Table of Contents
Table of Contents
Model 501LT
Installation - Model 501LT...................................................................... 37
Receiving - 501LT.................................................................................................. 37
Placement - 501LT................................................................................................. 37
Single Phase Electrical Connections - 501LT.............................................................. 38
Water Connections - 501LT..................................................................................... 39
Drain Connections - 501LT...................................................................................... 40
Pumps and Injection Points - Detergent and Rinse-aid Dispensing Pumps - 501LT..................... 42
Pump Priming - Detergent and Rinse-aid Dispensing Pumps - 501LT.............................. 44
Fill Adjustments - Detergent and Rinse-aid Dispensing Pumps - 501LT...................................... 45
Operation - Model 501LT................................................................................... 46
Loading Dish Racks - 501LT.................................................................................... 46
Normal Wash Mode - 501LT.................................................................................. 47
Vari-Cycle Mode - 501LT........................................................................................ 48
Drain Mode - 501LT............................................................................................... 49
Cleaning - Model 501LT......................................................................... 50
Cleaning the Wash Tank - 501LT............................................................................. 50
Cleaning the Wash Arms - 501LT............................................................................ 50
Cleaning Scrap Screen and Sump Strainer - 501LT.................................................... 51
Deliming - Models 501LT........................................................................................ 52
Maintenance - Model 501LT.................................................................... 54
Daily, Weekly, Monthly.......................................................................................... 54
Troubleshooting - Models 501HT, 501LT............................................................... 57
Service Replacement Part - Models 501HT, 501LT........................................... 69
Electrical Schematics - Models 501HT, 501LT................................................. 107
Timing Charts - Models 501HT, 501LT.................................................................. 110
iv
Receiving and Placement - Installation
Receiving - 501HT
NOTE:
The installation of your dishwasher must be performed by qualified service personnel familiar
with food service equipment and must comply with all local health codes.
Problems due to improper installation are not covered by the Limited Warranty.
NOTE:
The installation of the dishwasher must comply with all local electrical, plumbing, health and
safety codes or in the absence of local codes, installed in accordance with the applicable
requirements in the National Electrical Code, NFPA 70, Canadian Electrical Code (CEC),
Part 1, CSA C22.1; and the Standard for Ventilation Control and Fire Protection of
Commercial Cooking Operations, NFPA 96.
Placement - 501HT
CAUTION:
Be careful when lifting and moving the dishwasher to prevent damage to the machine.
1.
Inspect the outside of the dishwasher carton for signs of damage.
2.
Remove the carton and inspect the dishwasher for damage.
3.
Check for any options or accessories that may have shipped with your dishwasher.
4.
Compare the installation site utility connections with the dishwasher utility connections
and make sure they are the same.
5.
The dishwasher can be installed as a free-standing unit or under a counter-top.
The typical counter-top height in most locations is 34" [86cm].
6.
It is highly recommended that the
underside of the counter-top be clad
in metal.
7.
Under counter installations should
provide storage space for the
dishwasher chemical supply
containers. Do not elevate the
containers above the finished floor.
8.
9.
Chemical supply containers should
be placed as close to the machine
as possible and the chemical tubing
taped to the back of the machine
should be repositioned before
permanently placing the machine.
Wall
Counter-top
34"
[86cm]
Min.
Place the dishwasher in its
permanent location.
10. The dishwasher has 4 adjustable
feet for leveling.
11. Level the dishwasher front-to-back
and side-to-side.
Floor
3" [8cm] Min.
1
Installation - 501HT
Water Connections - 501HT
VERY IMPORTANT:
Make sure the flexible water supply and drain hoses are not kinked.
Plumbing connections must allow the machine to be pulled out for service and cleaning.
Plumbing connections must comply with national, provincial local plumbing and sanitary
codes. Only qualified service personnel familiar with food service equipment should install
the machine.
The installing plumber must thoroughly flush the water supply line to remove all debris
BEFORE connecting the water supply line to the machine.
CAUTION:
Plumbing connections must be made BEFORE the electrical installaion is performed.
Damage to the machine's water heaters will occur if the power is turned on to the
machine without an adequate water supply.
ATTENTION:
It is the installing plumber's responsibility to flush the incoming water line to remove debris
before connecting to the dishwasher. Failure to do so may void the machine warranty.
1. All models have a 6 ft. flexible hot water fill hose with a 3/4" female garden hose connector.
2. A 1/2" or larger main incoming supply line must be installed to the dishwasher.
3. A 1/2" or larger shut-off valve should be installed in the main water supply, as close to the
dishwasher as possible for servicing.
The 501HT with booster has a built-in flow control. The flowing incoming hot water supply
pressure must be between 25-95 psi. The hot water supply must provide a minimum of
140°F/60°C, measured at the dishwasher for 40°F/22°C rise booster or 110°F/43°C for
70°F/39°C rise booster.
4. A water hardness of 3 grains/gal (US) [5.3 mg/L] or less is recommended. Excessively hard
water may need a water softener or other means of water treatment to prevent lime build-up.
2
501HT - Installation
Drain Connections - 501HT
! VERY IMPORTANT !
Do not connect the drain hose to a disposer. The dishwasher will not drain correctly.
Refer to the photo below.
1. All models are equipped with a 6 ft.. 5/8" I.D. drain hose. The maximum drain
height connection must not exceed 3 ft.[1 m] and must be vented to prevent
the wash tank from siphoning.
2. The drain hose is located at the rear of the dishwasher, and is secured to the rear of
the machine by two clamps to maintain an anti-siphoning loop in the drain hose.
3. A 3/4" hose barb fitting is strapped to the drain hose prior to shipment.
The service part number for the hose barb is P/N 0512321.
4. Additional plumbing parts must be supplied by the plumbing installer.
5. The maximum drain flow is 15 US gpm/12.4 imp gpm/60 lpm.
! ATTENTION !
FAILURE TO FOLLOW THE DRAIN CONNECTION INSTRUCTIONS MAY VOID THE WARRANTY.
DO NOT REMOVE HOSE CLAMPS
NOR STRETCH HOSE
3/4" DRAIN HOSE BARB FITTING
STRAPPED TO DRAIN HOSE
3
Installation - 501HT
Drain Connection - 501HT (continued)
DO NOT REMOVE THE CLAMPS HOLDING THE DRAIN HOSE TO THE
BACK OF THE DISHWASHER.
DO NOT CONNECT THE DRAIN HOSE TO A DISPOSER.
DO NOT REDUCE THE SIZE OF THE DRAIN HOSE CONNECTION NOR USE A DOMESTIC
DRAIN FITTING.
DO NOT ADD ADDITIONAL LENGTH TO THE DRAIN HOSE.
DO NOT ALLOW THE DRAIN HOSE TO KINK.
For a Direct Drain Connection:
1. Install the drain hose to an 1-1/2" or larger vented "WYE" drain fitting.
2. CONNECTION TO A "TEE" FITTING WILL PREVENT THE DISHWASHER FROM
DRAINING COMPLETELY.
Drain Hose
Clamp
3/4" NPT Hose Barb
Fitting
Drain
Adapter
Fitting
WYE
Fitting
(Supplied by others)
DO
connect the dishwasher flexible drain
hose to a vented WYE drain fitting.
4
DO NOT
connect the dishwasher flexible
drain hose to a TEE drain fitting.
501HT - Installation
Drain Connection - 501HT
For an Indirect Drain Connection:
1. A 1" [25.4mm] minimum air gap must be provided between the outlet of the dishwasher
drain hose and the flood-level rim of the floor drain, floor sink or any other locally
approved drain receptacle. (See illustration below.)
Dishwasher
Drain Hose
Floor
Minimum
Air Gap
1” [25.4mm]
Floor Drain
! VERY IMPORTANT !
IMPROPER INSTALLATION OF MACHINE DRAIN HOSE.
Machine drain problems are often the result of improper installation and may not
be covered by the limited warranty.
5
Installation - 501HT
Electrical Connections - 501HT with Built-in Booster1PH
and 3PH Wiring Diagrams
WARNING:
Electrocution or serious injury may result when working on an
energized circuit.
Disconnect power at the main breaker or service disconnect switch
before working on the circuit.
Lock-out and tag the breaker or service disconnect switch to
indicate that work is being performed on the circuit.
THREE PHASE POWER CONNECTION
GRD
L1
L2
L3
208-230 208-230
VAC
VAC
N
115VAC
208-230 VAC
! VERY IMPORTANT !
THE ELECTRICAL POWER MUST BE A
4-WIRE PLUS GROUND SUPPLY WHICH
INCLUDES A CURRENT CARRYING NEUTRAL.
HOW TO CONNECT 3 PHASE POWER
1. Check the data plate on the front of the
dishwasher for the phase of the machine.
.
If the data plate says the machine is 3 Phase,
then connect a 3 PH power supply.
2. Remove the lower access panel.
3. Pull power connection box forward and out.
4. The Main Terminal Block has terminals for
L1, L2, L3, Neutral and Ground.
5. Connect ground, then connect
L1, L2, L3 to 208-230VAC.
6. Connect a current carrying neutral to N.
7. Main power connections are complete.
! ATTENTION !
A qualified electrician must connect the main incoming power to the dishwasher in
accordance with all local codes and regulations or in the absence of local codes in
accordance with the National Electrical Code or the Canadian Electrical Code.
6
501HT - Installation
Electrical Connections - 501HT with Built-in Booster1PH
and 3PH Wiring Diagrams
! ATTENTION !
The installation of the dishwasher must comply with all local electrical, plumbing,
health, and safety codes or in the absence of local codes, installed in accordance
with the applicable requirements in the National Electrical Code, NFPA 70,
Canadian Electrical Code (CEC), Part 1, CSA C22.1; and the Standard for Ventilation Control and Fire Protection of Commercial Cooking Operations, NFPA 96.
SINGLE PHASE POWER CONNECTION
GRD
Do not connect power to L3
L1
L2
L3
N
115VAC
208-230 0 VAC
VAC
0 VAC
! VERY IMPORTANT !
THE ELECTRICAL POWER MUST BE A
3-WIRE PLUS GROUND SUPPLY WHICH
INCLUDES A CURRENT CARRYING NEUTRAL.
HOW TO CONNECT 1 PHASE POWER
1. Check the data plate on the front of the
dishwasher for the phase of the machine.
.
If the data plate says the machine is 1 Phase,
then connect a 1 PH power supply.
2. Remove the lower access panel.
3. Pull power connection box forward and out.
4. The Main Terminal Block has connections
for L1, L2, L3, Neutral and Ground.
5. Connect ground, then connect
L1, L2 to 208-230VAC.
6. Connect a current carrying neutral to N.
DO NOT CONNECT POWER TO L3.
7. Main Power connections are complete.
7
Installation - 501HT
Connecting Incoming Power to the Main Terminal Block
for 1PH and 3PH Machines with Boosters- 501HT
WARNING:
Electrocution or serious injury may result when working on an
energized circuit.
Disconnect power at the main breaker or service disconnect switch
before working on the circuit.
Lock-out and tag the breaker or service disconnect switch to
indicate that work is being performed on the circuit.
! VERY IMPORTANT !
PROVIDE A 3 FEET/1 METER SERVICE LOOP IN THE POWER SUPPLY
CABLE TO SERVICE THE DISHWASHER.
! SINGLE PHASE POWER REQUIREMENT !
SINGLE PHASE 501HT
The electrical power must be a 3-wire plus ground supply which
includes a current carrying neutral.
! THREE PHASE POWER REQUIREMENT !
THREE PHASE 501HT
The electrical power must be a 4-wire plus ground supply which
includes a current carrying neutral.
8
501HT - Installation
Connecting Incoming Power to the Main Terminal Block
for 1PH and 3PH Machines with Boosters- 501HT
Refer to the photo below:
1. Remove the lower front dishwasher panel.
2. Remove the retaining fasteners (A) from the swing-out brackets and swing the chemical
pump bracket (B) and the chemical circuit board bracket (C) out of the way as shown.
(continued on next page)
A
C
A
B
Main Terminal Block Cover
9
Installation - 501HT
Connecting Incoming Power to the Main Terminal Block
for 1PH and 3PH Machines with Boosters
(continued from previous page)
Refer to the photo below:
3. Provide a 3 foot/1 meter service loop in the power supply cable to service the machine
4. Route the power cable from the rear of the machine to the terminal block making sure
the cable does not touch the booster tank.
5. Connect the power cable to the terminal block bracket using a suitable strain relief
connector.
6. Connect the power wires according to the wiring diagrams on page 3 for either
single phase or three phase operation.
7. Swing the chemical pump bracket and the chemical board back into position and
secure with the existing fasteners.
Main Terminal Block Cover
10
Main Terminal Block
501HT - Installation
Booster Heater Conversion from 1PH to 3 PH Operation
! VERY IMPORTANT !
THE BOOSTER HEATER IS WIRED FOR 1PH OPERATION WHEN SHIPPED.
FOLLOW THE INSTRUCTIONS BELOW TO WIRE THE BOOSTER FOR 3PH.
WARNING:
Electrocution or serious injury may result when working on an
energized circuit.
Disconnect power at the main breaker or service disconnect switch
before working on the circuit.
Lock-out and tag the breaker or service disconnect switch to
indicate that work is being performed on the circuit.
1.
2.
To convert the booster heater from single phase to three phase operation, locate the booster wire labeled 1H3 that is cable-tied to the booster hose.
Remove the shrink insulation from the terminal and connect to the booster heater element as shown in the wiring diagram on page 12.
The three phase booster wire (1H3) is cable-tied to the hose adjacent to the booster tank.
11
Installation - 501HT
Booster Heater Conversion from 1PH to 3 PH Operation (continued)
! VERY IMPORTANT !
THE BOOSTER HEATER IS WIRED FOR 1PH OPERATION WHEN SHIPPED.
FOLLOW THE INSTRUCTIONS BELOW TO WIRE THE BOOSTER FOR 3PH.
3.
Disconnect the existing booster heater wires and change the booster heater element
jumpers as shown in the illustration below
4.
Connect wires 1H1, 1H2, and 1H3 as shown below.
Booster Heater
Connected for 3PH
Booster Heater
Connected for 1PH
Wire not
connected
1H2
1H1
1H1
1H3
1H3
1H2
Wiring Diagram - Booster heater element connections shown for 1 phase and 3 phase operation.
12
501HT - Installation
Completing the 1PH to 3PH Electrical Conversion
! ATTENTION !
CHANGE THE DATA PLATE ON THE LOWER FRONT PANEL OF THE MACHINE
AFTER THE MACHINE IS WIRED FOR 3PH AND THE BOOSTER HEATER IS CONNECTED
FOR 3PH.
1.
The data plate on the dishwasher lower front panel must be changed after the machine is converted from single phase operation to three phase operation.
2.
Locate the replacement data plate stowed on the back of the lower front panel.
3.
Remove the paper backing from the label and carefully place it over the existing
data plate label making sure it covers the label completely.
4.
Re-install the lower front panel to complete the conversion.
A three phase data plate is located on the back of the lower front panel.
13
Installation - 501HT
Booster Fill Switch - 501HT
(Filling the booster tank for the first time)
! CAUTION !
AVOID PERMANENT DAMAGE TO THE BOOSTER HEATER
DO NOT TURN THE DISHWASHER POWER SWITCH
ON WHEN FILLING THE BOOSTER FOR THE FIRST TIME.
THE BUILT-IN BOOSTER TANK WAS DRAINED BEFORE SHIPMENT AND
MUST BE REFILLED BEFORE OPERATING THE DISHWASHER.
THE BOOSTER FILL SWITCH IS LOCATED BEHIND THE LOWER FRONT PANEL ON THE
RIGHT SIDE OF THE MACHINE.
To refill the booster for the first time:
1. Turn the main breaker or disconnect switch to the dishwasher ON.
2. DO NOT PUSH THE DISHWASHER ON-OFF/DRAIN POWER SWITCH TO THE ON POSITION.
3. Locate the booster fill switch and note the switch is in the OFF position.
(continued on next page)
1
14
501HT - Installation
Booster Fill Switch - 501HT
(Filling the booster tank for the first time)
4. PUSH AND HOLD the booster fill switch in the FILL position until water starts filling
inside the wash compartment.
5. Release the FILL switch.
2
6. PUSH the booster fill switch to the ON position and release.
7. The booster fill operation is complete.
8. Replace the lower front panel on the machine.
3
15
Installation - 501HT
Chemical Connections - 501HT
! VERY IMPORTANT !
ALWAYS USE A COMMERCIAL-GRADE NON-CHLORINATED DETERGENT.
PLACE THE CHEMICAL SUPPLY CONTAINERS AS CLOSE TO THE MACHINE AS POSSIBLE.
DO NOT ELEVATE THE CHEMICAL CONTAINERS ABOVE THE FINISHED FLOOR.
! VERY IMPORTANT !
Contact a chemical supplier for detergent and rinse-aid chemicals. The chemical supplier must
adjust the chemical dispensing pumps for water hardness and food soil types.
Chemical Dispensing Pumps
1. The detergent and rinse-aid pumps are located on the lower left-side of the machine
behind the lower-front access panel.
2. Each pump is equipped with 6 feet [1.8 m] of pick-up tubes consisting of supply tubing,
stiffener tubes, and strainers.
3. The pick-up tubes are stowed on the back of the machine for shipping.
4. A red label marked DETERGENT and a blue label marked RINSE-AID identify the
chemical lines.
RINSE-AID
DETERGENT
The 501HT pumps are located on
the left-side behind the lower front panel
of the dishwasher.
16
501HT - Installation
Detergent and Rinse-aid Pumps and Injection Points - 501HT
! VERY IMPORTANT !
ALWAYS USE A COMMERCIAL-GRADE NON-CHLORINATED DETERGENT.
PLACE THE CHEMICAL SUPPLY CONTAINERS AS CLOSE TO THE MACHINE AS POSSIBLE.
DO NOT ELEVATE THE CHEMICAL CONTAINERS ABOVE THE FINISHED FLOOR.
Injection Point Locations
1. For 501HT, the detergent and rinse-aid enter the wash tank compartment through a fitting on back right corner of the wash compartment.
501HT
DETERGENT
and
RINSE-AID
INJECTION
POINT
(continued on next page)
17
Blank Page
This Page
Intentionally
Left Blank
18
501HT - Installation
Detergent and Rinse-aid Pumps and Injection Points - 501HT
Priming the Dispensing Pumps
! VERY IMPORTANT !
The chemical dispensing pumps must be primed before operating the dishwasher and
whenever the chemical container is changed.
REQUIRED
501HT Control Panel
1.
The chemical dispensing pump supply lines must be primed before they will pump the
chemicals properly.
2.
Make sure the chemical containers are full and the correct pick-up tubes are in their
containers.
3.
Turn the dishwasher power switch ON. The switch will illuminate and the dishwasher
will fill with water.
4.
Open the dishwasher door, then push and hold the prime push button UP to the
DETERGENT position until detergent is observed entering the wash tank compartment
through the fitting located on the back right
corner of the tank. Release the push button.
5.
Push and hold the prime push button DOWN
to the Rinse-aid position until you see air
bubbles moving through the rinse-aid tubing,
then hold the button for another 2 minutes.
Release the push button.
6.
Close the door to complete the priming
operation.
(continued on next page)
19
Installation - 501HT
Detergent and Rinse-aid Pumps and Injection Points - 501HT
! ATTENTION !
The amount of dispensed chemical is determined by the run time of the dispensing pump.
Refer to the photo below:
1.
2.
The chemical dispensing pump run and the tank fill adjustment screws are located on the end of the chemical circuit board swing-out bracket.
It is not necessary to swing the bracket out to make adjustments, but if desired, remove
the mounting nut (A) and swing the bracket (B) out and to the right.
3. Refer to the next page for adjustment instructions.
! VERY IMPORTANT !
INSPECT & REPLACE THE CHEMICAL DISPENSING PUMP SQUEEZE TUBES EVERY SIX MONTHS.
A
B
B
! VERY IMPORTANT !
Contact a chemical supplier for detergent and rinse-aid chemicals. The
chemical supplier must adjust the chemical dispensing pumps for water
hardness and food soil types.
20
501HT - Installation
Detergent and Rinse-aid Pumps and Injection Points - 501HT
Refer to the photo below:
To adjust the amount of chemicals dispensed
by the pumps:
1. Make sure the chemical containers are full and the pick-up tubes are in their proper containers.
3. Turn the dishwasher power switch ON.
The switch will illuminate and the dishwasher
will fill with water.
4. Run a normal dishwasher cycle and test detergent and rinse-aid concentrations according to the chemical supplier's instructions.
CAUTION:
Excessive pressure to the potentiometers when
adjusting can result in bent or broken adjusting
screws.
5.
Each dispensing pump has a clearly marked
adjustment screw. Turn the screw CW to increase the run time of the dispensing pump and CCW to reduce the run time.
Use a 4mm
blade
screwdriver
Fill Adjustments
To adjust the tank fill:
Fill Adjustment
For 501HT
1. The fill adjustment screw will provide a small change in the tank water level.
2. If a large adjustment is needed, check the incoming water pressure and make sure the fill hose is not kinked.
3.
If the above items are okay then the size of the incoming water supply should be checked. The incoming water supply line must be a minimum of 1/2" or larger.
21
Operation - 501HT
Operation - 501HT
Loading Dish Racks
! VERY IMPORTANT !
DO NOT OVERLOAD THE DISH RACK.
LOAD ONE DISH RACK INTO THE MACHINE AT A TIME.
1.
Prescrap and rinse the wares before loading to remove large food particles.
2.
Load soiled wares into the dish rack. Place plates and glasses in a peg rack. Place
cups and bowls in a flat bottom rack. Place utensils in a single layer in a flat-bottom rack.
Place pots and pans in a flat-bottom rack.
Do not overload the dish rack. Wash one dish rack at a time.
3.
Slide one dish rack into the wash compartment making sure that wares do not interfere
with the rotating spray arms. Do not wash more than one dish rack at a time.
Prescrap and rinse wares before
loading into the machine.
Load plates and glasses in a peg
rack.
22
501HT - Operation
Loading Dish Racks (continued)
Load pots and pans in a
flat-bottom rack.
Load utensils in a single layer in a
flat-bottom rack.
Load cups and bowls in a
flat-bottom rack.
NEVER stack dish racks.
Wash one dish rack at a time.
23
Operation - 501HT
Operation - 501HT
Normal Wash Mode
501HT Control Panel
REQUIRED
ON-OFF/DRAIN Wash Temperature
Power Switch
Digital Display
Final Rinse Temperature
Digital Display
Prime
Push button
Varicycle
Delime
Pushbutton
Start
In-cycle Light Push button
1.
Close the dishwasher front door.
2.
Push the dishwasher Power Switch UP to turn the power ON.
3.
The power switch will illuminate and the machine will fill with water.
4.
Wait until the wash temperature gauge indicates a minimum of 150ºF/66ºC.
PLACE AN EMPTY DISHRACK IN THE MACHINE AND RUN THE FIRST
CYCLE EMPTY TO HEAT THE WASH TANK INTERIOR.
5.
Load the dish rack into the machine. Wash one dish rack at a time.
6.
Close the door, then press the START BUTTON for 1 second. The green in-cycle
light will illuminate and the wash cycle will begin. The total cycle is approximately
141 seconds.
7.
Opening the door during a cycle will stop the dishwasher. If the door is open more than 5
seconds the cycle will restart from the beginning, if open less than 5 seconds the cycle
will resume where it left off after door is closed.
8.
The final rinse cycle begins at the end of the wash cycle. The machine drains and then
refills with fresh water hot water. Check the rinse temperature gauge during the final rinse.
It must indicate a minimum of 180-195ºF/82-91ºC. The final rinse water is retained
for the next wash cycle.
9.
When the green cycle light goes out, open the door and remove the rack of clean wares.
! ATTENTION !
DOOR LEFT OPEN DURING WASH CYCLE
If the dishwasher door is left open for more than 5 seconds during the normal wash mode, then
the dishwasher cycle will reset to the beginning of the normal wash cycle.
! ATTENTION !
RINSE SENTRY MODE WILL EXTEND WASH CYCLE TIME
In the event that the final rinse temperature has not reached 180-195ºF/82-91ºC after the
wash cycle, the rinse sentry will extend the wash cycle time until the booster reaches
180-195ºF/82-91ºC. If the proper temperature is not reached within 5 minutes, the machine
will leave the rinse sentry mode and complete the cycle.
24
501HT - Operation
Vari-cycle Mode - 501HT
The Vari-cycle Mode is used to wash heavily soiled items such as pots, pans and other wares that
require more washing time than the standard Normal Wash Mode.
The dishwasher will remain in the Vari-cycle Mode until the operator exits the mode
or 15 minutes has elapsed.
1.
Load a dish rack into the dishwasher, close the door and press the START button.
2.
The green in-cycle light will illuminate and the dishwasher will begin a normal wash cycle.
3.
Wait 10 seconds for the detergent to enter the wash compartment before pressing the
VARI-CYCLE button.
Press the Vari-cycle/Delime button to place the
machine into the extended wash mode to
clean heavily soiled wares.
REQUIRED
4.
Press the VARI-CYCLE button to place the dishwasher in the Vari-cycle Mode.
5.
The green extended wash light will illuminate indicating that the machine is in the
Vari-cycle Mode.
6.
The dishwasher will continue to wash for a maximum of 15 minutes or until the operator
presses the VARI-CYCLE button again whichever occurs first.
7.
Press the VARI-CYCLE button. The green extended wash light will go out indicating that
the dishwasher has returned to the Normal Wash Mode.
8.
The dishwasher will finish the wash cycle and perform a final rinse of the wares.
25
Operation - 501HT
Rinse Sentry Mode - 501HT
! ATTENTION !
DOOR LEFT OPEN DURING WASH CYCLE
If the dishwasher door is left open for more than 5 seconds during the normal wash mode, then
the dishwasher cycle will reset to the beginning of the normal wash cycle.
! ATTENTION !
RINSE SENTRY MODE WILL EXTEND WASH CYCLE TIME
In the event that the final rinse temperature has not reached 180-195ºF/82-91ºC after the
wash cycle, the rinse sentry will extend the wash cycle time until the booster reaches
180-195ºF/82-91ºC. If the proper temperature is not reached within 5 minutes, the machine
will leave the rinse sentry mode and complete the cycle.
Drain Mode
The dishwasher will enter the drain mode whenever the Power Switch is pushed down to the OFF
(DRAIN) position.
(DRAIN)
POWER
Place the Power Switch in the OFF/(DRAIN) position
(continued on next page)
26
501HT - Operation
501HT - Operation
Drain Mode (continued)
1.
Push the illuminated power switch down to the OFF(DRAIN) position.
The power switch light will go out.
2.
The cycle light will illuminate and the machine will drain.
3.
The machine, will flush, perform 3 short drain cycles and then drain completely.
4.
The cycle light will go out indicating that the drain cycle is complete. Do not open
the door until the light goes out.
! VERY IMPORTANT !
Draining Problems Related To Improper Installation.
Problems with draining are often the result of improper installation. The drain hose
is looped and clamped as shown in the photo below and must not be changed.
The drain hose is looped and
clamped and must not be
changed. Altering the drain
hose routing may result in the
machine's inability to drain
or may cause the machine to
siphon the water out of the
machine.
27
Cleaning - 501HT
Cleaning - 501HT
! VERY IMPORTANT !
DRAIN AND CLEAN THE DISHWASHER EVERY 2 HOURS OF CONTINUOUS
OPERATION, AFTER EACH MEAL PERIOD, AND AT THE END OF THE DAY.
Cleaning the wash tank:
1.
Remove the upper and lower spray arms and flush clean in a sink.
2.
Remove the scrap screen taking care that debris does not fall off the screen and into the
wash tank or sump. Flush the screen clean in a sink. Be sure to back-flush the screen.
3.
DO NOT strike the scrap screen on solid surfaces.
4.
Check the sump for foreign material.
5.
Clean the pump intake strainer in the bottom of the sump.
6.
DO NOT scrub the interior with metal scrub pads.
7.
Check the sump heating element for lime deposits and gently remove with a scouring
pad. DO NOT USE METALLIC SCRUB PADS.
8.
Wipe the exterior of the dishwasher with a soft clean cloth and a mild detergent.
9.
Leave the door open to aid in overnight drying.
! ATTENTION !
DO NOT USE METALLIC SCRUB PADS TO CLEAN THE MACHINE.
DO NOT SPRAY THE EXTERIOR OF THE MACHINE WITH WATER.
28
501HT - Cleaning
501HT - Cleaning
Cleaning the wash arms:
1. Unscrew the retaining screw from the upper and lower interchangeable spray arms.
2. Flush the spray arms clean in a sink. Be sure to flush the wash arm bearings.
Retaining
Screw
Wash Arm
Bearing
501HT
29
Cleaning - 501HT
Cleaning - 501HT
Scrap Screen and Sump Strainer
1. Lift the scrap screen straight up and out of the
machine to prevent food particles from falling
into the tank sump.
Scrap
Screen
2. Flush the scrap screen in a remote sink making
sure to back-flush both side of the screen.
3. Wipe the tank sump of water and debris.
4. Carefully inspect the pump intake strainer. This
strainer is not removeable but must be thoroughly
cleaned before reinstalling the scrap screen.
Tank
Sump
!
Sump
Strainer
ATTENTION !
A CLOGGED OR
RESTRICTED SUMP
STRAINER WILL
PREVENT THE
PROPER WASHING,
RINSING AND
DRAINING OF THE
MACHINE.
! ATTENTION !
WIPE THE EXTERIOR OF THE MACHINE WITH A SOFT CLOTH AND MILD
DETERGENT. DO NOT SPRAY THE EXTERIOR WITH WATER OR BLEACH.
LEAVE THE DOOR OPEN TO AID IN OVERNIGHT DRYING.
30
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31
De-liming - 501HT
Deliming - 501HT
DANGER:
Death or serious injury may result when deliming solution is mixed with sodium hypochlorite
sanitizing agent. Mixing may cause hazardous gases to form. Deliming solution and other acids
must never be mixed with chlorine, iodine, bromine, or fluorine.
CAUTION:
Skin contact with deliming solutions can cause severe irritation and possible chemical burns.
Always wear eye protection, rubber gloves and protective clothing when handling chemicals.
Delime Mode - 501HT
The VARI-CYCLE/DELIME switch is used to the delime the machine.
REQUIRED
Model 501HT
Vari-cycle/Delime Push button
Delime Required Indicator Light - 501HT
The light will illuminate after 1000 cycles to alert the operator that it is time to delime the
machine. The light will go out after the machine is delimed in accordance with the instructions on
the next page.
32
501HT - De-liming
Deliming - 501HT
A deliming agent must be used in accordance with your chemical supplier's instructions.
Follow the steps below to de-lime the 501HT:
1. Open the dishwasher door and remove any dish racks.
2. Turn the power switch on the dishwasher to the ON position.
3. Remove the detergent and rinse-aid, and sanitizer chemical supply tubing from their
chemical supply containers.
4. Place the tubing in a container of hot water.
5. Press and hold the prime switch UP in the DETERGENT position to flush the detergent from
the supply tubing. Release the switch.
6. Press and hold the rinse-aid prime switch UP in the RINSE AID position to flush the rinse-aid
from the supply tubing. Release the switch.
7. Turn the dishwasher power switch to OFF/DRAIN to drain the wash tank. The green cycle
light will go out in about 2 minutes.
8. Always wear eye protection, rubber gloves and protective clothing when handling
chemicals.
9. Open the door and carefully add the de-liming chemical to the wash tank in accordance
with your chemical supplier's instructions. Be careful to avoid splashing.
10. Close the door and press the VARI-CYCLE/Delime push button three times.
11. The VARI-CYCLE green indicator light will illuminate and the machine will run.
12. Check the deliming results and if scale is still present repeat steps 9-11.
13. Push the power switch ON to refill the machine.
14. Run 4 empty cycles to flush any deliming chemicals from the machine.
15. Return chemical supply tubing to their containers and prime the chemical lines.
16. Return the dishwasher to normal operation.
33
Maintenance - 501HT
Maintenance - 501HT
Follow the maintenance schedules below to keep the dishwasher operating most efficiently.
Daily Maintenance
1.
Make sure the water supply is on and that the drain is not clogged.
2.
Check the temperature gauges and/or displays to ensure they are operating.
3.
Make sure the dish racks are in good condition.
4.
Check the chemical containers and refill as required.
5.
Follow the cleaning procedures provided in the Cleaning Section.
Weekly Maintenance
1. Perform Steps 1-5 in the Daily Maintenance.
2. Inspect water lines for leaks.
3. Check for water leaks underneath the dishwasher.
4. Make sure the flexible water fill and drain hoses are not kinked.
5. Make sure that the dishwasher is level.
6. Clean accumulated lime deposits from the wash tank heating element.
7. Inspect the scrap screen and replace it if damaged.
8. Check the spray arms and replace or repair if damaged.
Monthly Maintenance
1.
Perform the Daily and Weekly Maintenance listed above.
2.
Clean the chemical dispenser pick-up tubing for the chemical dispensing pumps.
To clean the pick-up tubing:
1.
Remove the pick-up tubes from their containers.
2.
Place each tube in a separate container of hot water.
3.
Press and hold the PRIME buttons UP and DOWN until water flows into the wash tank
compartment.
4.
Return the pick-up tubes to their containers.
5.
Run 3 empty dishwasher cycles to flush any chemicals from the dishwasher wash
compartment.
6.
Return the pick-up tubes to their containers and prime the chemical lines.
NOTE:
There are no lubrication points on the dishwasher.
34
Model 501LT Low Temperature Undercounter Dishwasher
Model 501LT Low Temperature
Undercounter Dishwasher
35
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36
Receiving and Placement - Installation
Receiving - 501LT
NOTE:
The installation of your dishwasher must be performed by qualified service personnel familiar
with food service equipment and must comply with all local health codes.
Problems due to improper installation are not covered by the Limited Warranty.
NOTE:
The installation of the dishwasher must comply with all local electrical, plumbing, health and
safety codes or in the absence of local codes, installed in accordance with the applicable
requirements in the National Electrical Code, NFPA 70, Canadian Electrical Code (CEC),
Part 1, CSA C22.1; and the Standard for Ventilation Control and Fire Protection of
Commercial Cooking Operations, NFPA 96.
Placement - 501LT
CAUTION:
Be careful when lifting and moving the dishwasher to prevent damage to the machine.
1.
Inspect the outside of the dishwasher carton for signs of damage.
2.
Remove the carton and inspect the dishwasher for damage.
3.
Check for any options or accessories that may have shipped with your dishwasher.
4.
Compare the installation site utility connections with the dishwasher utility connections
and make sure they are the same.
5.
The dishwasher can be installed as a free-standing unit or under a counter-top.
The typical counter-top height in most locations is 34" [86cm].
6.
It is highly recommended that the
underside of the counter-top be clad
in metal.
7.
Under counter installations should
provide storage space for the
dishwasher chemical supply
containers. Do not elevate the
containers above the finished floor.
8.
Chemical supply containers should
be placed as close to the machine as
possible and the chemical tubing
taped to the back of the machine
should be repositioned before
permanently placing the machine.
9.
Place the dishwasher in its permanent
location.
10. The dishwasher has 4 adjustable feet
for leveling.
Wall
Counter-top
34"
[86cm]
Min.
Floor
3" [8cm] Min.
11. Level the dishwasher front-to-back
and side-to-side.
37
Installation - 501LT
(Single Phase) Electrical Connections - 501LT
WARNING:
Electrocution or serious injury may result when working on an
energized circuit.
Disconnect power at the main breaker or service disconnect switch
before working on the circuit.
Lock-out and tag the breaker or service disconnect switch to
indicate that work is being performed on the circuit.
! ATTENTION !
A qualified electrician must connect the main incoming power to the dishwasher in
accordance with all local codes and regulations or in the absence of local codes in
accordance with the National Electrical Code or the Canadian Electrical Code.
Refer to the connection diagram below for single a phase machine without a built-in booster.
1. A three prong 4 foot power cord and plug is prewired with the machine for connection to a 115VAC power source.
115VAC
SINGLE PHASE
POWER CONNECTION
L1
N
115VAC
15A
4 ft. power cord w/plug supplied
! ATTENTION !
Model 501LT is equipped with a 4 ft. power cord and plug. These models require a
115VAC,15A receptacle.
38
501LT - Installation
Water Connection - 501LT
VERY IMPORTANT:
Make sure the flexible water supply and drain hoses are not kinked.
Plumbing connections must allow the machine to be pulled out for service and cleaning.
Plumbing connections must comply with national, provincial local plumbing and sanitary codes.
Only qualified service personnel familiar with food service equipment should install the machine.
The installing plumber must thoroughly flush the water supply line to remove all debris
BEFORE connecting the water supply line to the machine.
1. All models have a 6 ft. flexible hot water fill hose with a 3/4" female garden hose connector.
2. A 1/2" or larger main incoming water supply line should be installed to the dishwasher.
3. We recommend that a 1/2" or larger shut-off valve be installed in the main water supply,
as close to the dishwasher as possible for servicing.
4. The 501HT has a built-in flow control which requires that the incoming hot water supply pressure must be between 25-95 psi.
5. The hot water supply must provide a minimum of 120°F/49°C, measured at the
dishwasher; however, 140°F/60°C is recommended.
6. A water hardness of 3 grains/gal (US) [51.3 mg/L] or less is recommended. Hard
water can adversely affect wash results.
Drain Connection - 501LT
1. All models have a 6 ft.. 5/8" I.D. drain hose. The maximum drain height connection must not exceed 3 ft.[0.9 m].
2. A 3/4" hose barb fitting is strapped to the drain hose to connect the drain hose to a
wye drain fitting. The service part number for the hose barb is P/N 0512321.
3. The maximum drain flow is 15 US gpm/12.4 imp gpm/60 lpm.
DO NOT REMOVE HOSE
CLAMPS
NOR STRETCH HOSE
3/4" DRAIN HOSE BARB FITTING
STRAPPED TO DRAIN HOSE
39
Installation - 501LT
Drain Connection - 501LT (continued)
DO NOT REMOVE THE CLAMPS HOLDING THE DRAIN HOSE TO THE
BACK OF THE DISHWASHER.
DO NOT CONNECT THE DRAIN HOSE TO A DISPOSER.
DO NOT REDUCE THE SIZE OF THE DRAIN HOSE CONNECTION NOR USE A DOMESTIC
DRAIN FITTING.
DO NOT ADD ADDITIONAL LENGTH TO THE DRAIN HOSE.
DO NOT ALLOW THE DRAIN HOSE TO KINK.
For a Direct Drain Connection:
1. Install the drain hose to an 1-1/2" or larger "WYE" vented drain fitting.
2. CONNECTION TO A "TEE" FITTING WILL PREVENT THE DISHWASHER FROM
DRAINING COMPLETELY.
Drain Hose
Clamp
3/4" NPT Hose Barb
Fitting
Drain
Adapter
Fitting
WYE
Fitting
(Supplied by others)
DO
connect the dishwasher flexible drain
hose to a WYE drain fitting.
40
DO NOT
connect the dishwasher flexible
drain hose to a TEE drain fitting.
501LT - Installation
For an Indirect Drain Connection:
1. A 1" [25.4mm] minimum air gap must be provided between the outlet of the dishwasher
drain hose outlet and the flood-level rim of the floor drain, floor sink or any other locally
approved drain receptacle. (See illustration below.)
Dishwasher
Drain Hose
Floor
Minimum
Air Gap
1” [25.4mm]
Floor Drain
! VERY IMPORTANT !
IMPROPER INSTALLATION OF MACHINE DRAIN HOSE.
Machine drain problems are often the result of improper installation and may not
be covered by the limited warranty.
41
Installation - 501LT
Pumps and Injection Points - Detergent, Rinse-aid and Sanitizer
Dispensing Pumps - 501LT
! VERY IMPORTANT !
ALWAYS USE A COMMERCIAL-GRADE NON-CHLORINATED DETERGENT.
PLACE THE CHEMICAL SUPPLY CONTAINERS AS CLOSE TO THE MACHINE AS POSSIBLE.
DO NOT ELEVATE THE CHEMICAL CONTAINERS ABOVE THE FINISHED FLOOR.
NOTE:
Contact a chemical supplier for detergent and rinse-aid chemicals. The chemical supplier
must adjust the chemical dispensing pumps for water hardness and food soil types.
1.
The chemical dispensing pumps are located on a center bracket behind the lower-front
access panel.
2.
Each pump is equipped with 6 feet [1.8 m] of supply tubing, stiffener tubes, and strainers.
3.
A RED label marked DETERGENT, a BLUE label marked RINSE-AID and a WHITE Label
marked SANITIZER identify the chemical lines.
4.
The chemicals enter the wash tank compartment through a fitting located on the rear righthand side of the wash compartment.
501LT
DETERGENT
RINSE-AID
and
SANITIZER
INJECTION
POINT
CHEMICAL
PICK-UP
TUBES
The chemical dispensing pick-up tubes are stowed at
the rear of the dishwasher.
42
On the 501LT, chemicals enter the wash tank
through a fitting on the rear wall of the tank.
501LT - Installation
Pumps and Injection Points - Detergent, Rinse-aid and Sanitizer
Dispensing Pumps - 501LT
NOTE:
CHEMICAL SQUEEZE TUBES
SHOULD BE INSPECTED AND
REPLACED EVERY 6 MONTHS
RINSE-AID
SANITIZER
DETERGENT
The chemical dispensing pumps are located on the bracket behind
the lower-front access panel.
NOTE:
5.25% sodium hypochlorite (chlorine beach) must be used as a sanitizing agent to provide
a minimum concentration of 50 ppm in the final rinse for the USA and 100 ppm in Ontario,
Canada. The 50 ppm or 100 ppm concentration must be checked using chlorine test strips to
make sure that the proper concentration is maintained.
43
Installation - 501LT
Pump Priming - Detergent, Rinse-aid and Sanitizer Dispensing Pumps
501LT Control Panel
120
140
0
40
0
40
20
210
0
1110
120
C
F
22
60
100
-20
NSF
200
80
20
0
160
60
180
80
10
Prime
Push buttons
44
1.
Make sure the chemical containers are full and the correct pick-up tubes are in their
containers.
2.
Turn the dishwasher power switch ON. The switch will illuminate and the dishwasher
will fill with water.
3.
Refer to the illustration below and note the two momentary push buttons provided to
prime the detergent, sanitizer and rinse aid pumps.
4.
Open the dishwasher door and observe the inlet chute on the rear right-hand side of
the wash tank.
5.
Push and hold the PRIME push button UP to the DETERGENT position until detergent is
observed entering the wash tank compartment. Release the push button.
6.
Push and hold the same push button DOWN until sanitizer is observed entering the
wash tank compartment. Release the push button.
7.
Push and hold the other push button UP to the RINSE AID position until air bubble are
observed moving in the pick-up tube, then hold the button for another 2 minutes Release
the push button.
8.
Priming is complete.
501LT - Installation
Pump and Tank Fill Adjustments
! ATTENTION !
The amount of dispensed chemical is determined by the run time of the dispensing pump.
Use a 4mm
blade
screwdriver
1.
Adjustment screws are provided for the
dispensing pumps and for the wash tank fill.
They are located on the right-hand side of
the dishwasher behind the lower front access
panel.
2.
Make sure the chemical containers are full
and the pick-up tubes are in their proper
containers.
3.
Turn the dishwasher power switch ON.
The switch will illuminate and the dishwasher
will fill with water.
4.
Run a normal dishwasher cycle and test
chmical concentrations according to the
chemical supplier's instructions.
CAUTION:
Excessive pressure to the potentiometers when
adjusting can result in bent or broken adjusting
screws.
5.
Each dispensing pump has a clearly marked
adjustment screw. Turn the screw CW to
increase the run time of the dispensing pump
and CCW to reduce the run time of the
dispensing pump.
6.
The Fill adjustment screw will provide a
small change in the tank water level. If
a large adjustment is needed, check the
incoming water pressure and make sure the
fill hose is not kinked. If the above items are
okay then the size of the incoming water
supply should be checked.
The incoming water supply line must be a
minimum of 1/2" or larger.
45
Operation - 501LT
Operation - 501LT
Loading Dish Racks
! VERY IMPORTANT !
Prescrape and rinse wares before loading
into the machine.
! VERY IMPORTANT !
DO NOT OVERLOAD THE DISH RACK.
LOAD ONE DISH RACK INTO THE MACHINE AT A TIME.
Load plates and glasses in a peg rack.
Load cups and bowls in a flat bottom rack.
Load utensils in a single layer in a flat bottom
rack.
Load pots and pans in a flat bottom rack.
1.
Prescrape and rinse the wares before loading to remove large food particles.
2.
Load soiled wares into the dish rack. Place plates and glasses in a peg rack. Place
cups and bowls in a flat bottom rack. Place utensils in a single layer in a flat-bottom rack.
Place pots and pans in a flat-bottom rack.
Do not overload the dish rack. Wash one dish rack at a time.
3.
Slide one dish rack into the wash compartment making sure that wares do not interfere
with the rotating spray arms. Do not wash more than one dish rack at a time.
46
501LT - Operation
Operation - 501LT
Normal Wash Mode
120
140
0
40
0
40
20
ON-OFF/DRAIN
Power Switch
120
C
F
210
0
1110
22
60
100
-20
NSF
200
80
20
0
160
60
180
80
10
Prime
Push buttons
Cycle Light
1.
Close the dishwasher front door.
2.
Push the dishwasher Power Switch UP to turn the power ON.
3.
The power switch will illuminate and the machine will fill with water.
4.
Wait until the wash temperature gauge indicates a minimum of 120ºF/49ºC.
Start
Push button
RUN THE FIRST CYCLE WITH AN EMPTY DISH RACK TO HEAT
THE WASH TANK INTERIOR.
5.
Load the dish rack into the machine. Wash one dish rack at a time.
6.
Close the door, then press the START BUTTON for 1 second. The green in-cycle
light will illuminate and the wash cycle will begin. The total cycle is approximately
141 seconds.
7.
Opening the door during a cycle will stop the dishwasher. If the door is open more
than 5 seconds the cycle will restart from the beginning, if open less than 5 seconds
the cycle will resume where it left off when the dishwasher door is closed.
8.
The final rinse cycle begins at the end of the wash cycle. The machine drains and
then refills with fresh water hot water. Check the rinse temperature gauge during
the final rinse. It must indicate a minimum of 120ºF/49ºC. The final rinse water is
retained for the next wash cycle.
9.
When the green cycle light goes out, open the door and remove the rack of clean
wares.
! VERY IMPORTANT !
5.25% sodium hypochlorite (chlorine beach) must be used as a sanitizing agent to
provide a minimum concentration of 50 ppm in the final rinse for the USA and 100 ppm
in Ontario, Canada. The 50 ppm or 100 ppm concentration must be
checked using chlorine test strips to make sure that the concentration is maintained.
47
Operation - 501LT
Vari-cycle Mode - 501LT
The Vari-cycle Mode is used to wash heavily soiled items such as pots, pans and other wares
that require more washing time than the standard Normal Wash Mode. The dishwasher will
remain in the Vari-cycle Mode until the operator exits the mode or 15 minutes has elapsed.
1.
Load a dish rack into the dishwasher, close the door and press the START button.
2.
The green in-cycle light will illuminate and the dishwasher will begin a normal wash cycle.
3.
Wait 10 seconds for the detergent to enter the wash compartment before pressing the
Vari-cycle/Delime button.
Press the Vari-cycle button to increase the
wash time for clean heavily soiled wares.
4.
Press the Vari-cycle/Delime button to place the dishwasher increase the wash time.
5.
The green Vari-cycle light will illuminate indicating that the machine is in the
Vari-cycle mode.
6.
The dishwasher will continue to wash for a maximum of 15 minutes or until the operator
presses the Vari-cycle button again whichever occurs first.
7.
Press the Vari-cycle button. The green Vari-cycle light will go out indicating that the
dishwasher has returned to the Normal Wash Mode.
8.
The dishwasher will finish the wash cycle and perform a final rinse of the wares.
48
501LT - Operation
Drain Mode
The dishwasher will enter the drain mode whenever the Power Switch is
pushed down to the OFF/DRAIN position.
(DRAIN)
POWER
1.
Push the illuminated power switch down to the OFF/DRAIN position.
The power switch light will go out.
2.
The cycle light will illuminate and the machine will drain.
3.
The machine, will flush, perform 3 short drain cycles and then drain completely.
4.
The cycle light will go out indicating that the drain cycle is complete.
! VERY IMPORTANT !
Draining Problems Related To Improper Installation.
Problems with machine draining are often the result of improper installation. The drain hose
is looped and clamped as shown in the photo below and must not be changed.
The drain hose is looped and
clamped and must not be
changed. Altering the drain
hose routing may result in the
machine's inability to drain
or may cause the machine to
siphon the water out of the
machine.
49
Cleaning - 501LT
Cleaning - 501LT
Retaining
Screw
Wash Arm
Bearing
! VERY IMPORTANT !
DRAIN AND CLEAN THE DISHWASHER EVERY 2 HOURS OF CONTINUOUS
OPERATION, AFTER EACH MEAL PERIOD, AND AT THE END OF THE DAY.
Cleaning the wash tank:
1.
Remove the upper and lower spray arms and flush clean in a sink.
2.
Remove the scrap screen taking care that debris does not fall off the screen and into the
wash tank or sump. Flush the screen clean in a sink. Be sure to back-flush the screen.
3.
DO NOT strike the scrap screen on solid surfaces.
4.
Check the sump for foreign material.
5.
Clean the wash pump strainer in the bottom of the sump.
6.
DO NOT scrub the interior with metallic scrub pads.
7.
Check the sump heating element for lime deposits and gently remove with a scouring
pad. DO NOT USE METALLIC PADS.
8.
Wipe the exterior of the dishwasher with a soft clean cloth and a mild detergent.
DO NOT USE BLEACH.
9.
Leave the door open to aid in overnight drying.
Cleaning the wash arms:
1.
There are two combination wash/rinse arms in the wash tank. They are interchangeable.
2.
The wash arms are should be removed and thoroughly flushed clean in a sink.
3.
Special attention should be paid to the cleaning and inspection of the wash arm
bearings making sure they are clean and free of excessive wear.
4.
If the bearings are damaged, contact an authorized service agent for replacement.
50
501LT - Cleaning
Cleaning - 501LT (continued)
Scrap Screen and Sump Strainer
Scrap
Screen
1. Lift the scrap screen straight up and out of
the machine to prevent food particles from
falling into the tank sump.
2. Flush the scrap screen in a remote sink
making sure to back-flush both side of the
screen.
3. Wipe the tank sump of water and debris.
4. Carefully inspect the sump strainer. This
strainer is not removable but must be
thoroughly cleaned before reinstalling the
scrap screen.
!
Tank
Sump
ATTENTION !
A CLOGGED SUMP
STRAINER WILL
PREVENT THE
PROPER WASHING,
RINSING AND
DRAINING OF THE
MACHINE.
Sump
Strainer
! ATTENTION !
WIPE THE EXTERIOR OF THE MACHINE WITH A SOFT CLOTH AND MILD
DETERGENT. DO NOT SPRAY THE EXTERIOR WITH WATER.
LEAVE THE DOOR OPEN TO AID IN OVERNIGHT DRYING.
51
Deliming - 501LT
Deliming - 501LT
DANGER:
Death or serious injury may result when deliming solution is mixed with sodium hypochlorite
sanitizing agent. Mixing may cause hazardous gases to form. Deliming solution and other acids
must never be mixed with chlorine, iodine, bromine, or fluorine.
CAUTION:
Skin contact with deliming solutions can cause severe irritation and possible chemical burns.
Always wear eye protection, rubber gloves and protective clothing when handling chemicals.
Delime Mode - 501LT
The Vari-cycle/Delime switch is used to the delime the machine.
Model 501LT
Vari-cycle/Delime Push button
52
501LT - Deliming
501LT Deliming
Follow the steps below to delime the 501LT:
1. Open the dishwasher door and remove any dish racks.
2. Turn the power switch on the dishwasher to the ON position.
3. Remove the detergent and rinse-aid, and sanitizer chemical supply tubing from their
chemical supply containers.
4. Place the tubing in a container of hot water.
5. Press and hold the prime switch UP in the DETERGENT position to flush the detergent from
the supply tubing. Release the switch.
6. Press and hold the prime switch DOWN in the SANITIZER position to flush the sanitizer
from the supply tubing. Release the switch.
7. Press and hold the rinse-aid prime switch UP in the RINSE AID position to flush the rinse-aid
from the supply tubing. Release the switch.
8. Turn the dishwasher power switch to OFF/DRAIN to drain the wash tank. The green cycle
light will go out in about 2 minutes.
9. Always wear eye protection, rubber gloves and protective clothing when handling
chemicals. Open the door and carefully add the deliming chemical to the wash tank in
accordance with your chemical supplier's instructions. Be careful to avoid splashing.
10. Close the door and press the Vari-cycle/Delime push button three times.
11. The Vari-cycle/Delime green indicator light will illuminate and the machine will run for 23
minutes.
12. Check the deliming results and if scale is still present repeat steps 9-11.
13. Push the power switch ON to refill the machine and return the dishwasher to normal
operation.
14. Return chemical supply tubing to their containers and prime the chemical lines.
53
Maintenance - 501LT
Follow the maintenance schedules below to keep the dishwasher operating most efficiently.
Daily Maintenance
1.
Make sure the water supply is on and that the drain is not clogged.
2.
Check the temperature gauges and/or displays to ensure they are operating.
3.
Make sure the dish racks are in good condition.
4.
Check the chemical containers and refill as required.
5.
Follow the cleaning procedures provided in the 501LT Cleaning Section.
Weekly Maintenance
1. Perform Steps 1-5 in the Daily Maintenance.
2. Inspect water lines for leaks.
3. Check for water leaks underneath the dishwasher.
4. Make sure the flexible water fill and drain hoses are not kinked.
5. Make sure that the dishwasher is level.
6. Clean accumulated lime deposits from the wash tank heating element.
7. Inspect the scrap screen and replace it if damaged.
8. Check the spray arms and replace or repair if damaged.
Monthly Maintenance
1.
Perform the Daily and Weekly Maintenance listed above.
2.
Clean the chemical dispenser pick-up tubing for the chemical dispensing pumps.
To clean the pick-up tubing:
1.
Remove the pick-up tubes from their containers.
2.
Place each tube in a separate container of hot water.
3.
Press and hold the PRIME buttons UP and DOWN until water flows into the wash tank
compartment.
4.
Return the pick-up tubes to their containers.
5.
Run 3 empty dishwasher cycles to flush any chemicals from the dishwasher wash
compartment.
6.
Return the pick-up tubes to their containers and prime the chemical lines.
NOTE:
There are no lubrication points on the dishwasher.
54
501HT, 501LT - Troubleshooting Chart and Timing Charts
Models 501HT, 501LT
Troubleshooting Charts
55
Blank Page
This Page
Intentionally
Left Blank
56
Troubleshooting
501HT, 501LT
IllustrationsPage
Troubleshooting Chart - 501HT, 501LT .................................................................... 58
Wash Display Codes Temperature Display Board - 501HT Only.................................. 59
Rinse Display Codes Temperature Display Board - 501HT Only................................... 60
Booster Display Codes Temperature Display Board - 501HT Only................................ 61
Timer Board Connection Diagram - 501HT, 501LT..................................................... 62
Timer Board Diagnostic Testing - 501HT, 501LT......................................................... 63
Temperature Display Board Power Terminal Connections - 501HT, 501LT..................... 64
Temperature Display Board M3-M4 Selector Slide Switch - 501HT, 501LT.................... 65
Temperature Display Board Diagnostics - 501HT, 501LT............................................. 66
Booster/Wash Tank Heater Interlock Circuit Operation - 501HT Only.......................... 67
57
Troubleshooting - 501HT, 501LT
Condition
Cause
Solution
Dishwasher will not run.
Door not closed.
Main power OFF.
Dishwasher OFF.
Close door completely.
Check breaker on panel.
Turn dishwasher power switch ON.
Low or no water.
Main water supply off.
Fill hose kinked.
Low incoming water pressure.
Solenoid valve defective.
Solenoid strainer clogged.
Circuit board fuse blown.
Oppen supply valve.
Straighten fill hose.
Set flowing water pressure to 20-22 PSI.
Install repair kit or replace.
Clean strainer.
Contact service agent.
Chemicals won't feed into
dishwasher.
Chemical supply low.
Supply tubing damaged.
Supply tubing kinked.
Pick-up tube clogged.
Chemical circuit board fuse blown.
Refill chemical container.
Replace tubing.
Straighten tubing.
Clean/replace tube.
Contact service agent.
Low water pressre pumped
from wash spray arms.
Clogged scrap screen.
Clogged spray arms.
Clogged pump intake screen.
Clean scrap screen.
Clean spray arms.
Inspect sump and clean pump intake
screen.
Poor wash results.
Excessively hard water.
water temperature low.
Contact chemical supplier,
Raise incoming water temperature to
140°F.
Replace thermistor.
(See chemicals won't feed above.)
(See low or no water above.)
Replace squeeze tube.
Replace injector motor.
Clean tubing and pick-up.
Contact service agent.
Reposition wares or reduce amount of
wares in dish racks.
Reset or replace high limit.
Reset or replace high limit.
Thermistor defective.
(See chemicals won't feed above.)
(See low or no water above.)
Detergent injector defective.
Chemical circuit board fuse blown.
Wares incorrectly loaded in
dishrack.
Booster high limit tripped.
Wash tank high limit tripped.
Water has drained out of
the wash tank while the
dishwasher was idle.
Anti-siphon loop in drain hose has
been removed.
Drain hose clamp is not holding the
drain hose in proper position.
Building plumbing does not provide
correct air vent to provent siphoning.
Re-route drain hose.
DO NOT STRETCH HOSE.
Replce/adjust hose clamp, making sure
goose-neck is maintained.
Contact service agent and/or plumber.
Dishwasher stays in wash
cycle.
501HT - Incoming wsater supply
cold.
Rinse Sentry extends wash mode for
a maximumum time of 5-minutes to
allow final rinse water temperature
to reach 180°F/82°C.
The Vari-ccle button was pressed
and Vari-cycle light is on.
Raise incoming water temperature.
Adjust/replace final rinse booster
thermistor.
58
Press Vari-cycle button to exit and return
to the normal wash mode.
501HT Only - Digital Temperature Display Codes
Digital Temperature Display Codes
Display codes that appear in the display windows indicate the operating condition of the machine.
Refer to the illustrations below for the meaning of the codes.
Wash Display Codes
WASH DISPLAY CODE
Lo
WASH TEMP
HHH
WASH TEMP
188
E
WASH TEMP
Wash temperature
is below 100˚F
RINSE TEMP
186
Wash temperature
is above 180˚F
RINSE TEMP
171
WASH TEMP
CAUSE
Wash tank is empty and tank
heater is on.
CAUTION:
The tank may be extremely hot.
RINSE TEMP
179
Defective wash thermistor or
open, broken, wire between
thermistor and board or loose
connection.
RINSE TEMP
59
Digital Temperature Display Codes - 501HT Only
Rinse Display Codes
RINSE DISPLAY CODE
159
WASH TEMP
156
WASH TEMP
Lo
146
WASH TEMP
60
Rinse temperature
is below 100˚F
RINSE TEMP
HHH
Rinse temperature
is above 200˚F
RINSE TEMP
Booster tank is empty
& booster heater is on.
149
WASH TEMP
CAUSE
RINSE TEMP
E
RINSE TEMP
CAUTION:
Temperature in the booster
may be extremely hot
Defective rinse thermistor or
open, broken, wire between
thermistor and board or loose
connection.
501HT Only - Digital Temperature Display Codes
Booster Display Codes
Error Codes for Booster and Final Rinse Thermistors Only.
CAUSE
DISPLAY CODES
150
WASH TEMP
H
RINSE TEMP
RINSE TEMP
NOTE: After the therrmistor
is reconnected, there is a 5
second delay before the
display is re-energized.
Both booster and final rinse
display thermistors are
defective, unplugged, or open
or broken wires between the
display and thermistor.
150
WASH TEMP
NOTE: Booster is locked out
for 10 minutes before being
re-energized.
Booster therrmistor is
defective or disconnected,
broken wires.
150
WASH TEMP
Booster overtemp lockout
because booster temperature
is greater than 210˚F.
RINSE TEMP
NOTE: After a therrmistor
is reconnected, there is a 5
second delay before the
display is re-energized.
61
Timer Board Connection Diagram - 501HT, 501LT 62
501HT, 501LT - Timer Board Diagnostic Testing
Diagnostic Testing for the Solid State Timer Board, P/N 0712105
Beginning with S/N W150350341 and above
1
2
Before testing, Press the dishwasher power switch to OFF/DRAIN and allow the machine
to complete the drain cycle.
Check the incoming voltages.
With the Power switch in the OFF/DRAIN position,
press the START button 2 times.
If the drain valve opens and closes 5 times
then the DRAIN VALVE is okay.
ON
OFF
(DRAIN)
POWER
PRESS START
Open the door.
3
TWO TIMES
Indicator light
If the green cycle indicator light blinks continuously
for 10 seconds, then the DOOR SWITCH and the
CYCLE LIGHT are okay.
START
Indicator light
Press and release the START button.
4
START
If the green cycle indicator light flashes then the
START BUTTON is okay.
START
PRESS START
AND RELEASE
With the Power switch in the OFF/DRAIN position,
press the START button 3 times.
5
The timer board and the following components
are okay if the components run consecutively for
a few seconds in the following order:
1.
2.
3.
4.
5.
6.
START
PRESS START
THREE TIMES
Fill Valve
Detergent Pump
Rinse-aid Pump
Drain Valve opens and then closes
Wash Pump
Drain Pump or Sanitizer Pump
Troubleshooting - See below if one or more of the components in Step 5 did not run.
C O N DITIO N
6
POSSIBLE CAUSE/SOLUTION
A single component in Step 5 does not run.
Check the component that did not run.
Wash pump only component that runs (Except UH330B)
Check timer bd 4A fuse. (All except UH330B)
Wash pump only component that runs (UH330B Only)
Check timer bd 6A fuse. (UH330B Only)
Wash pump only component that won’t run. 4A/6A fuse okay.
Check pump/motor - see troubleshooting guide.
None of the components in Step 5 run.
Check neutral wire - see troubleshooting guide.
0512979 rev. C
63
Digital Temperature Display Board - 501HT, 501LT
B
120VAC input
for booster control
C
240VAC input
for wash tank heater
Fuse 20A
20 Amp fuse
for wash tank heater
Undercounter Temperature Display Board — P/N 0512106-1
Power Terminals.
D
A
120VAC input
for display board
Wash
Heater
IN
Booster IN
Wash
Heater OUT
Booster OUT
F
E
240VAC output
to wash tank heater
120VAC ouput
to booster contactor coil
64
Neutral
Power
501HT, 501LT - Digital Temperature Display Board
M3
NOTE:
The machine will not operate properly if the
selector switch is set to the wrong position.
Slide the selector switch to the M4 position
for machines equipped with thermistors only.
M4 Setting
Slide the selector switch to the M3 position
for machines equipped with thermostats.
M3 Setting
Before installing a new version display board,
you must select the model type using the
M3 - M4 Switch located at the bottom center
of the circuit board.
! ATTENTION — VERY IMPORTANT !
Undercounter Temperature Display Board — P/N 0512106-1
M3 - M4 Model Selector Slide Switch
M4
65
Digital Temperature Display Board - 501HT, 501LT
A
D
Undercounter Temperature Display Board
P/N 0512106-1
B
Rinse Test
Pushbutton
Booster
Wire Harness Plug
Temperature
for Wash and Rinse
C
Adjust
Thermistors
Wash Test
M4
Pushbutton
SETTING
ONLY
E
Wash
Temperature
Adjust
M4
SETTING
ONLY
AB-
C-
Diagnostics
When testing the circuit board
operation, disconnect the harness from this plug. The wash and
rinse displays will display E.
Push and hold the rinse test
pushbutton. A numerical value
of 179-180 should appear
in the rinse temperature display
window indicating the circuit
board is operating normally.
Push and hold the wash test
pushbutton for 10 seconds
A numerical value of 140
should appear in the wash
temperature display window
indicating the circuit board
is operating normally.
Temperature Adjustments
When performing diagnostics the values are
displayed in °F even if the display is set for °C.
Turn clockwise to increase the
booster temperature. Full range
is 3/4 turns 180-200°F. DO
NOT FORCE PAST THE STOPS.
A F/C Slide switch is provided on the board
to change the display from the factory default
setting of °F to the optional °C.
DE-
Turn clockwise to increase the
wash temperature. Full range is
3/4 turns 120-160°F. DO NOT
FORCE PAST THE STOPS.
66
501HT Only - Booster Heater/Wash Tank Heater Interlock Circuit Operation
Booster Heater/Wash Tank Heater Interlock Circuit Operation
For Model 201HT, the booster heater/wash tank heater interlock circuit removes
power from the wash tank heater whenever the booster heater contactor energizes.
The illustration below shows how the booster heater contactor is wired.
The booster heater contactor is located on the center of the base behind the lower front access
panel.
Interlock Circuit Operation
1.
The dishwasher fills with water when the main power switch on the dishwasher is
turned on.
The booster heater thermistor calls for heat which energizes the booster heater
contactor.
2.
The auxiliary contact on the top of the contactor opens and removes power from the
wash tank heater.
3.
When the booster heater thermister is satisfied, the booster heater contactor deenergizes
and the auxiliary contacts close applying power to the wash tank heater.
4.
This operation is repeated whenever the booster thermistor calls for heat.
Auxiliary
Contactor
L1
N
To wash
tank heater
115VAC
L1
1H3
No power
when booster
heater is
connected for
1 PH
L2
1H1
1H2
From
main
terminal block
115 VAC
From
main
terminal block
1 PH
208-230VAC
Main Terminal Block (MTB)
No power when booster
heater is connected for 1 PH
L3
To booster heater
1 PH 208-230VAC
Booster Heater
Contactor
No power when booster
heater is connected for 1 PH
L1
L2
To booster
heater contactor
1PH
208-230VAC
L3
N
To
Auxiliary
Contactor
115VAC
No power when booster
heater is connected for 1 PH
67
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This Page
Intentionally
Left Blank
68
501HT, 501LT - Service Replacement Parts
Models 501HT, 501LT
Service Replacement Parts
69
Blank Page
This Page
Intentionally
Left Blank
70
Service Replacement Parts
Service Replacement Parts
IllustrationsPage
Wash Pump/Motor Assembly - 501HT, 501LT.....................................................................72
Base Assembly - 501HT, 501LT..........................................................................................74
Fill Piping Assembly - 501HT, 501LT...................................................................................78
Fill Solenoid Valve - 501HT, 501LT.....................................................................................80
Fill Chute Assembly - 501HT, 501LT....................................................................................82
Chemical Dispensing Pumps - 501HT Only..........................................................................84
Chemical Dispensing Pumps - 501LT Only...........................................................................86
Booster Assembly - 501HT Only.........................................................................................88
Power Input Block and Cord Assembly - 501HT, 501LT.........................................................90
Timer Control Board Assembly - 501HT, 501LT....................................................................92
Wash/Rinse Spray Arm and Drain Valve - 501HT, 501LT......................................................94
Control Panel - 501HT Only..............................................................................................96
Control Panel - 501LT Only................................................................................................98
Panels - 501HT, 501LT....................................................................................................100
Door Assembly - 501HT, 501LT........................................................................................102
Dish racks - 501HT, 501LT..............................................................................................104
71
Wash Pump/Motor Assembly - 501HT, 501LT
14
15
1
13
5
6
7
8
9
10
2
4
3
12
11
72
501HT, 501LT - Wash Pump/Motor Assembly
ItemPart
No.No.
Description
Qty.
1
CAPACITOR 40µF
1
2
0512101
PUMP/MOTOR ASSEMBLY COMPLETE
115VAC/60/1
1
3
0313394
BRACKET, WASH PUMP 1
4
0512185
BOLT, HEX FLANGE 1/4-20 X 3/8" SST
2
5110285
GASKET
1
6114139
SEAL
1
70512345
IMPELLER
1
0512347
8
0501478
WASHER, PLAIN, 17/64"
1
9
106482
WASHER, LOCK, 1/4"
1
10
114144
NUT, M6
1
11
0512340
SCREW, M4, PHIL, PAN HD.
9
12
0512341
VOLUTE, PUMP
1
13
114137
BACKPLATE, PUMP
1
14
107337
NUT, M4
9
15
0513131
COVER, REAR MOTOR FAN
1
NOTE: The pump motor is not sold separately.
73
Base Assembly - 501HT, 501LT
1
2
3
4
5
6
To upper
wash hub
8
14
6 10
22
11
12
9
501LT Only
5
13 15
6
16
20
501LT Only
17
21
18 19
23
18
19
20
24
13
27
24
25
25
26
28 29
30
31
74
7
501HT, 501LT - Base Assembly
ItemPart
No.No.
1
0512136
Description
Qty.
SCREEN, SCRAP ASSY.
1
2
0513324
30513677
FLANGE, PUMP SUCTION
1
O-RING
A/R
4
0512169
-----0512426
HEATER, 120VAC 750W (501LT)1
HEATER, 240V 2kW (501HT)1
5
201029-1
NUT, LOCK 1/2 INCH NI PLATED
60512099
O-RING
A/R
7
0508872
ADAPTOR, THERMOMETER (501LT Only)
1
8
0512107
THERMOMETER, WASH TANK (501LT Only)1
9
108954
NUT, GRIP 6-32 WITH NYLON INSERT SST
2
10
113604
THERMOSTAT, HI-LIMIT BI-METAL SNAP, 212°F
1
11
0512299
ADAPTOR, THERMISTOR (501HT Only)
1
12
0513310
THERMISTOR, 10 KΩ, 2 WIRE ASSY (501HT Only)1
13
0509302
HOSE, 5/8" ID X 1" OD X 6" LG.
A/R
14
0508808
CLAMP, SS GEAR
2
15
0507323
THERMOSTAT, WASH (501LT Only)
1
16
0513329
GASKET, PUMP SUCTION
1
17
0513325
ELBOW, PUMP SUCTION
1
180501476
WASHER
6
19
107967
NUT, 1/4-20 W/NYLON INSERT SST
6
20
0502571
CLAMP, HOSE 1-1/16" - 2"
2
21 0513328
HOSE, PUMP SUCTION
1
22
0512119
HOSE, PUMP DISCHARGE 1
23
0512101
PUMP/MOTOR COMPLETE 115/60/1
1
24
0512185
BOLT, HEX FLANGE 1/4-20 X 3/8" SST
1
25
0512985
CLAMP, HOSE
1
26
0504952
VALVE, FILL 5.0 GPM 1
1
75
Base Assembly - 501HT, 501LT
ItemPart
No.No.
Description
27
28
0509526
HOSE, 1/2" X 7 FT. FEM. GARD. ADAPT.
1
0501379
SWITCH, 15A
1
29
0512792
SCREW, 10-32 X 1/4" RD. HD. PHILL. SST
2
30
0508752
SCREW, 4-40 X 5/8" RH. HD. PHILL. SST
2
31
0313432
BRACKET, DOOR SWITCH
1
76
Qty.
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Left Blank
77
Fill Piping Assembly - 501HT, 501LT
Note:
This is a 3/4"
garden hose fitting
From Hot Water
Supply
8
Fill Valve Assembly
on Next Page
7
6
5
9
2
1
4
6
3
2
2
To Fill Chute
78
501HT, 501LT - Fill Piping Assembly
ItemPart
No.No.
Description
Qty.
1
0502653
ELBOW, 90° 3/8" MPT X 1/2" HOSE
1
2
0512185
BOLT, HEX FLANGE 1/4-20 X 3/8" SST
4
3
0300065
SUPPORT, VALVE
1
4
0300203
CLAMP, VALVE
1
5
0502618
HOSE BARB, 1/2" X 3/8" MPT
1
6
0512985
CLAMP, HOSE
1
7
0509526
HOSE, 1/2" X 7 FT. FEM. GARD. ADAPT.
1
8
0505320
WASHER, 1” OD GARDEN HOSE
1
9
0504952
VALVE, FILL, 3/8" NPT
1
79
Fill Solenoid Valve - 501HT, 501LT
8
7
6
5
9
4
3
2
1
80
501HT, 501LT - Fill Solenoid Valve
ItemPart
No.No.
Description
Qty.
1
0504952
VALVE, FILL 5.0 GPM
1
2
0502803
SCREEN, VALVE STRAINER
1
3
0502804
GASKET, CAP
1
4
0504958
WASHER, FLOW 5.0 GPM
1
5
0502811
KIT, REBUILD
1
60505229
GUIDE
1
7
0501406
SCREW, SLOT SS RH 8-32 X 1/2"
3
8
0505235
COIL, 115V 60HZ 10W
1
9
0502807
GASKET, OUTLET (COPPER)
1
81
Fill Chute Assembly - 501HT, 501LT
18
21
19
17
1
17
2
10
3
9
20
8
7
4
5
17
6
17
16
15
14
13
11
12
82
501HT, 501LT - Fill Chute Assembly
ItemPart
No.No.
Description
Qty.
1
107417
HOSE, RUBBER 1/2" ID X .84" OD
A/R
2
0502666
HOSE, 1/8" ID X 1/4" OD PVC
A/R
3
0502667
HOSE, 1/4" ID X 3/8" OD PVC
A/R
4
100194
NUT, GRIP 10-32 W/NYLON INSERT
2
5
0503722
NUT, HEX 10-32 SST
4
6
0507709
WASHER, FLAT #10 SST
4
7
0508867
CHUTE, INLET
1
8
0509048
GASKET, INLET CHUTE
1
9
0308822
CLAMP, EMT 1/2"
1
10
0509302
HOSE, 5/8" ID X 1" OD PVC BRAIDED
A/R
11
0306363
TUBE, STIFFENER
A/R
120501869
STRAINER
A/R
13
0509526
HOSE, FILL 1/2" X 7 FT. FEM. GARD. ADAPT.1
14
0503695
LABEL, DETERGENT HOSE
1
15
0505483
LABEL, RINSE-AID HOSE
1
16
0503694
LABEL, SANITIZER HOSE (501LT ONLY)
1
17
0512369
CLAMP, CONDUIT
4
18
0502571
CLAMP, HOSE GEAR
A/R
19
0512120
HOSE, WASH
1
20
----
106090
0501518
TIE PLATE
TIE, NYLON 5-1/2"
2
2
21
---
0512757
0512758
CONDUIT, 1/2"
CONDUIT, 3/8"
A/R
A/R
83
Chemical Dispensing Pumps - 501HT Only
12
13
14
18
19
7
17
IMPORTANT:
Check Items 9 and 20
every 6 months and replace
if stretched or worn.
15
RINSE-AID
16
20
4
3
2
5
21
6
2
7
6
11
8
DETERGENT
7
1
7
9
10
84
12
501HT Only - Chemical Dispensing Pumps
ItemPart
No.No.
Description
Qty.
10501869
STRAINER
2
2
0306363
TUBE, 3/8" ID X 12" LG. STIFFENER
1
3
0505483
LABEL, RINSE-AID HOSE
1
4
112883-1
TUBING, 1/8" OD X 1/16" ID
A/R
5
0503695
LABEL, DETERGENT HOSE
A/R
6
0502667
HOSE, 1/4" ID X 3/8" OD PVC
A/R
7
0501519
TIE, NYLON 4"
7
8
0512369
CLAMP, HOSE
2
9
114202
TUBE, PUMP 3/16" ID X 3/8" OD X 9" LG.
1
10
114203
PUMP HD KIT, PERISTALIC 2
11
0502644
ELBOW, 1/4" HOSE BARB
2
12
100007
SCREW, 10-32 X 3/8" TRUSS SST
3
13
0313644
PIN, HINGE
1
14
0513645
HOLDER, CABLE
4
15
0313393
BRACKET, CHEMICAL PUMP
1
16
0510870-1
GEARMOTOR, 115/60/1
2
17
0503756
MOTOR, INJECTOR PUMP
1
18
0313431
BRACKET, HINGED PANELS
1
19
0502666
HOSE, 1/8" ID X 1/4" OD PVC
A/R
20
0706635
TUBE, ELEMENT 45 CC 1
ROTOR
1
210707142
85
Chemical Dispensing Pumps - 501LT Only
5 4
4
3
2
6
1
4
20
22
18
11
21
8
SANITIZER
4
IMPORTANT:
Check Items 9 and 13
every 6 months and
replace if stretched
or worn.
7
17
11
19
17
16
17
17
8 9
17
10
9
8
RINSE-AID
10
17
7
15
12
DETERGENT
8
13
86
14
18
501LT Only - Chemical Dispensing Pumps
ItemPart
No.No.
Description
Qty.
10501869
STRAINER
2
2
0306363
TUBE, 3/8" ID X 12" LG. STIFFENER
1
3
0505483
LABEL, RINSE-AID HOSE
1
4
0502666
HOSE, 1/8" ID X 1/4" OD PVC
A/R
5
0503694
LABEL, SANITIZER HOSE
A/R
6
0503695
LABEL, DETERGENT HOSE
A/R
7
0502667
HOSE, 1/4" ID X 3/8" OD PVC
A/R
8
0501519
TIE, NYLON 4"
8
9
0706635
TUBE, ELEMENT ASSEMBLY 45CC
1
100707142
ROTOR
1
11
0503756
MOTOR, INJECTOR PUMP
1
12
0502644
ELBOW, 1/4" HOSE BARB
2
13
114202
TUBE, 3/16" ID X 3/8" OD X 9" LG.
1
14
114203
PUMP HD KIT, PERISTALIC 1
15
0512369
CLAMP, HOSE
1
16
0313393
BRACKET, CHEMICAL PUMP
1
17
0504822
SCREW, 8-32 X 1/2" PAN HD. SST
4
18
100007
SCREW, 10-32 X 3/8" TRUSS SST
3
19
0510870-1
GEARMOTOR, 115/60/1
1
20
0313644
PIN, HINGE
1
21
22
0313431
BRACKET, HINGED PANELS
1
0513645
HOLDER, CABLE
4
87
Booster Assembly - 501HT Only
4
3
1
1
14
2
6
5
2
1
4
13
15
7
88
8
9
10
11
12
501HT Only - Booster Assembly
ItemPart
No.No.
Description
Qty.
1
0512985
CLAMP, SS GEAR-MIN. 1/2"
4
2
107417
HOSE, RUBBER 1/2" ID X .84" OD
A/R
3
0513314
TEE, RINSE
1
4
0513310
THERMISTOR 10 kΩ, 2-WIRE
2
5
110562
THERMOSTAT, HIGH LIMIT 240°F
1
6
108954
NUT, GRIP 6-32 W/NYLON INSERT SST
2
7
0512185
BOLT, HEX FLANGE, 1/4-20 X 3/8" SST
2
8
109985
SEAL, BOOSTER ELEMENT
1
9
111235-1
BOOSTER, ELEMENT 5 KW, 40°F RISE
1
---
111233
BOOSTER, ELEMENT 9 KW, 70°F RISE
1
10
106482
WASHER, LOCK 1/4" SPLIT SST
3
11
100003
NUT, PLAIN 1/4-20 SST
6
12111885
INSULATOR
1
13
H161123
COVER, ELEMENT
1
14
0713333
TANK, BOOSTER SST
1
15
0508817
PLUG, 1/8"
1
----
0513538
HARNESS, BOOSTER THERMISTOR
2
---
0513537
HARNESS, WIRING (UH130B NOT SHOWN)1
89
Power Input Block and Cord Assembly - 501HT, 501LT
1
2
3
501HT
4
5
7
16
6
9
8
15
14
10
13
501LT
11
12
90
501HT, 501LT - Power Input Block and Cord Assembly
ItemPart
No.No.
Description
Qty.
1
0313396
COVER, BOX WIRING
1
2
0501411
SCREW, 10-32 X 1/4", TRUSS HD. 2
3
0512432
CONTACTOR, 3-POLE 120VAC COIL
1
4
0509527
BLOCK, TERMINAL, 4-POLE (501HT Only)1
5
103310
LUG, GROUND
1
6
0313395
BOX, WIRING
1
7
0503574
BUSHING, STRAIN RELIEF, SMALL
A/R
8
201029-1
NUT, LOCK 1/2 INCH NI PLATED
A/R
90512099
O-RING
1
10
0513312
CORD AND PLUG, 115VAC (501LT Only)
1
11
0507323
THERMOSTAT, WASH (501HT Only)
1
12
0503647
RELIEF, STRAIN
1
13
0501450
SCREW, 6-32 X 3/16" NIBS, RH PHIL. SST
2
14
0313410
BRACKET, POWER CORD
1
15
0512185
BOLT, HEX FLANGE, 1/4-20 X 3/8" SST
1
16
0503592
LABEL, GROUND
1
91
Timer Control Board Assembly - 501HT, 501LT
1
2
Front View
4
4
5
7
6
4
2
11
8
10
9
Rear View
12
14
3
92
13
501HT, 501LT - Timer Control Board Assembly
ItemPart
No.No.
Description
Qty.
1
0313397
BOX, CONTROL BOARD
1
2
0712105
TIMER CKT. BD. 1
3
0501464
SCREW, 10-24 X 3/8; TRUSS HD. SST
2
4
0512373
FUSE, 4A 250V
1
5
0313398
COVER, BOX
1
6
0501411
SCREW, 10-32 X 1/4" SST
1
7
0501373
SWITCH, BOOSTER FILL (501HT only)
1
80512973
STANDOFF
6
9
107964
BUSHING, STRAIN RELIEF
2
10
0512781
HOLDER, FUSE
1
11
0313644
PIN, HINGE
1
12
0501408
SCREW, 8-32 X 1/4" TRUSS HD. PHIL. SST
6
13
0313431
BRACKET, HINGED PANELS
1
14
0512243
LABEL, CHEMICAL ADJUST
1
93
Wash/Rinse Spray Arm and Drain Valve - 501HT, 501LT
4
5
7
6
3
2
1
8
12
9
10
11
17
32
18
13
31
12
20
28
27
21
22
14
26
23
15
24
16
94
29
19
11
6
30
25
501HT, 501LT - Wash/Rinse Spray Arm and Drain Valve
ItemPart
No.No.
Description
Qty.
1
0501478
WASHER, 17/64" ID X 9/16" OD SST
4
2
107967
NUT, HEX SST 1/4-20 NYLON INSERT
4
3
H35509-1
HUB, UPPER WASH ARM
1
4
107873
WASHER, PACKING
1
5
110215
SCREW, RETAINING
1
6
0502571
CLAMP, HOSE GEAR HOSE 1-1/2” SST
2
7
0512120
HOSE, UPPER WASH ARM
1
8
0512133
O-RING, 2-1/8" OD X 1-3/4" ID X 3/16 1
9
100738
BOLT, 1/4-20 X 1" HEX. HD. SST
4
10
0501481
WASHER, NYLTITE
4
11
H420548
WASH ARM ASSEMBLY (Includes Item 12) 2
12*
0712749
BEARING ASSEMBLY
2
13
0512129
NUT, WASH ARM
2
14
0512125
SHAFT, LOWER
1
15
0512066
HUB, LOWER WASH ARM
1
16
0512133
O-RING, 2-1/8" OD X 1-3/4" ID X 3/16 1
17
0513440
HOUSING, MANIFOLD 1
18
0513443
PIN, RETENTION
1
19
0509439
SCREW, RETENTION PIN 10-32 X 5/16" SST
1
20
0513446
O-RING, QUAD
1
21
0513445
O-RING, PIVOT SHAFT
2
22
0513447
SHAFT, FLAPPER
1
23
----
0712123
0509257
MOTOR, DRAIN VALVE
PIN, MOTOR (COMES WITH MOTOR)
1
1
24
104883
SCREW, MOTOR 6-32 X 3/8" SST
2
25
0501497
WASHER, SPLIT LOCK #8
2
26
0512126
SPRING, TORSION
1
270513442 FLAPPER
1
28
100194
NUT, FLAPPER SEAL
1
29
0512127
GASKET, FLAPPER
1
30
0501412
SCREW, FLAPPER SEAL 10-32 X 3/8" 1
31
0513441
BODY, CARTRIDGE DRAIN VALVE
1
32
0513444
O-RING, CARTRIDGE BODY
2
----
0713667
CARTRIDGE ASSEMBLY, COMPLETE
INCLUDES ITEMS 18-32
* Note:
The bearing assembly, P/N 0712749 includes 2 bearings, 1 locknut, and 1 wash arm hub.
The bearings, locknut and hub are not available as separate service replacement parts.
1
95
Control Panel - 501HT Only
10
9
7
8
10
11
9
8
1
6
5
12
4
2
3
2
5
3
96
12
501HT Only - Control Panel
ItemPart
No.No.
Description
Qty.
1
0512221
SWITCH, ROCKER DPST 250V NEON
1
2
0512213
SWITCH, PIEZIO
2
3
0512232
LIGHT, INDICATOR, GREEN
2
4
0512226
SWITCH, ROCKER RND SPDT MOMENTARY
1
5
0501408
SCREW, TRUSS PHIL. SST 8-32 X 1/4"
2
6
0513506
LABEL, FACIA
1
7
0313415
PANEL, FACIA
1
8
0512357
STANDOFF, LED DISPLAY BOARD
2
9
0503580
NUT, 10-32
2
10
0501563
SCREW, #8 X 3/8"
4
11
0512106-1
TEMPERATURE INDICATOR BD., DIGITAL
1
12
0512320
GASKET, STEAM
1
---
0512362
HARNESS, DIGITAL DISPLAY WIRING (Not Shown)
1
---
0513361
HARNESS, COMPLETE MACHINE (Not Shown)1
---
0513755
HARNESS, DELIME LIGHT (Not Shown)1
97
Control Panel - 501LT Only
Thermometer
probe located in
wash tank
11
10
9
8
7
6
2
6
1
3
8
5
4
1
2
98
9
12
501LT Only - Control Panel
ItemPart
No.No.
Description
Qty.
1
2
0512216
CONTACT, SWITCH MOMENTARY (N.O.)
2
0512217
HOUSING, PUSH BUTTON SWITCH
2
3
0512232
LIGHT, INDICATOR, GREEN
2
4
0512218
PUSH BUTTON, GREEN
1
5
0512219
PUSHBUTTON, GRAY
1
6
0512226
SWITCH, ROCKER RND SPDT MOMENTARY
2
7
0512107
THERMOMETER, 2" C/W 7FT CAPILLARY
1
8
0501408
SCREW, TRUSS PHIL. SST 8-32 X 1/4"
2
9
0512320
GASKET, STEAM
1
10
0512220
SWITCH, ROCKER DPST 125V NEON
1
11
0313416
PANEL, FACIA
1
12
0513505
LABEL, FACIA
1
---
0513362
HARNESS, WIRING (Not Shown)
1
99
Panels - 501HT, 501LT
6
3
1
7
2
8
8
9
4
5
100
501HT, 501LT - Panels
ItemPart
No.No.
Description
Qty.
1
0313405
PANEL, FRONT
1
2
100779
SCREW 1/4-20 X 5/8" TRUSS SS PHIL
2
30513735
GASKET
1
4
0313403
PANEL, LH SIDE
1
5
0503718
FOOT, ADJUSTING
4
6
0313402
PANEL, RH SIDE
1
7
0313401
PANEL, TOP
1
8
100007
SCREW, TRUSS SLOT SST 10-32 X 3/8"
A/R
9
0313404
PANEL, REAR
1
101
Door Assembly - 501HT, 501LT
10
3
2
10
1
6
5
3
8
9
7
4
5
9
6
7
102
501HT, 501LT - Door Assembly
ItemPart
No.No.
Description
Qty.
1
0713136
DOOR ASSEMBLY
1
2
0512319
GASKET, DOOR TOP
1
3
0513727
GASKET, DOOR SIDE
2
4
0713428
HINGE, RH ASSY
1
5
0310183
WASHER, 9/32" X 5/8" OD SS
1
6
0501422
BOLT, HEX SS 1/4-20 X 1-1/2"
1
7
0513332
SPRING, DOOR
2
8
0713429
HINGE, LH ASSY
1
9
0313430
ARM, DOOR SPRING
2
10
0512320
GASKET, STEAM
2
103
Dish Racks, Line Strainer, PRV - 501HT, 501LT
1
2
104
501HT, 501LT - Dish Racks
ItemPart
No.No.
1
2
Description
Qty.
101273
DISH RACK, FLAT-BOTTOM
AR
101285
DISH RACK, PEG
AR
105
Blank Page
This Page
Intentionally
Left Blank
106
Electrical Schematics
Electrical Schematics and
Timing Charts
IllustrationsPage
Electrical Schematic - High Temperature Model 501HT..........................................................108
Electrical Schematic - Low Temperature Model 501LT.............................................................109
Timing Charts - Models 501HT, 501LT.................................................................................110
107
Electrical Schematic - 501HT Only
4 AMP FUSE
SINGLE PHASE
201HT
501HT
108
THREE PHASE
501LT Only - Electrical Schematic
501LT M4
109
110
501LT
501HT
(UL130)
Timing Charts - 501HT, 501LT
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