STERO SD3 Series Building instructions
SD3 Series
SD3 ML-130232
SERVICE and PARTS
MANUAL
F45576 (1015)
TABLE OF CONTENTS
GENERAL .................................................................................................. 3
INTRODUCTION ....................................................................................... 3
MODELS COVERED ................................................................................... 3
SPECIFICATIONS ...................................................................................... 3
REFERENCE MATERIAL ............................................................................... 4
POWER-UP ............................................................................................ 4
FILL CYCLE ............................................................................................ 4
BOOSTER TEMPERATURE CONTROL ................................................................ 4
BOOSTER TEMPERATURE CONTROL ............................................................ 4
READY MODE ......................................................................................... 5
RUNNING A CYCLE .................................................................................... 5
CHANGING CYCLE TIME .............................................................................. 5
CHANGING CYCLE TIME .......................................................................... 5
LUBRICATION ......................................................................................... 5
TOOLS ................................................................................................. 5
SERVICE PROCEDURES AND ADJUSTMENTS ............................................................ 6
CONTROL BOARD PROGRAMMING ................................................................... 6
SERVICE PROGRAMMING ............................................................................. 7
TANK HEATER - TEST ................................................................................ 10
BOOSTER HEATER - TEST ........................................................................... 11
PUMP MOTOR - TEST ................................................................................ 12
THERMISTOR - TEST 1QTM, 2QTM & 3QTM .......................................................... 12
QUICK CHECK USING SERVICE DIAGNOSTICS .................................................. 12
MEASURING THERMISTOR RESISTANCE ....................................................... 12
TRANSFORMER 1T - TEST ........................................................................... 13
TRANSFORMER 2T - TEST ........................................................................... 14
DELIMIMG PROCEDURE ............................................................................. 15
DOOR TENSION ADJUSTMENT ...................................................................... 15
ELECTRICAL OPERATION ................................................................................ 16
COMPONENT FUNCTION ............................................................................ 16
COMPONENT LOCATION ............................................................................. 17
CONTROL BOARD / RELAY BOARD LAYOUT ........................................................ 18
SEQUENCE OF OPERATION ......................................................................... 19
CONTROL AND RELAY BOARD LEDS ................................................................ 21
WIRING DIAGRAM - 1 PHASE ........................................................................ 23
WIRING DIAGRAM - 3 PHASE ........................................................................ 24
TROUBLESHOOTING ..................................................................................... 25
QUICK REFERENCE CHART - ELECTRIC HEAT ...................................................... 25
CONTROL BOARD AND RELAY BOARD LEDS ................................................... 27
CONTROL BOARD AND RELAY BOARD .............................................................. 27
OPERATING CONDITIONS ....................................................................... 27
NO DISPLAY AFTER ON KEY IS PRESSED ....................................................... 28
NO FILL OR RINSE ............................................................................... 29
LONG FILL TIME (6 MINUTES) .................................................................... 30
NO WASH CYCLE ................................................................................ 30
NO TANK HEAT ................................................................................... 31
SERVICE DIAGNOSTICS ............................................................................. 32
SERVICE DIAGNOSTICS CHART ..................................................................... 33
OUTPUT TESTS ...................................................................................... 34
VERIFY CONTROL BOARD IS CONFIGURED AS AN SD3 ............................................ 35
ERROR CODE CHART ................................................................................ 35
TROUBLESHOOTING TABLE ......................................................................... 35
SD3 Series
F45576 (1015) Page 2 of 37
PARTS CATALOG ............................................................................................................................................. 36
© COMPETITIVE 2015
GENERAL
INTRODUCTION
This manual is applicable to the models and ML
numbers listed on the cover page. Procedures apply
to all models unless specified otherwise.
MODELS COVERED
SD3-H: Single water inlet. Incoming water of 110°F
minimum is heated by a booster tank mounted on the
machine. The machine is configured for a 70°F rise
depending on incoming water temperature. The
booster maintains water temperature to be used for
180°F final rinse.
SD3-P: Single water inlet. Water temperature to
machine must be a minimum of 180°F for the final
rinse. This water is provided by the customer external
of the machine. The SD3-P has the option to be
reprogramed to change from plain to chemical.
SPECIFICATIONS
• Operates as an atmospheric booster (SD3 with
built-in booster).
• Low water protection.
• One incoming plumbing connection to
dishwasher through an electrically operated
valve.
•The fill/rinse valve is installed prior to the 3.6
gallon booster tank.
• Supply flowing water pressure 20 ±5 psi.
• Provides a minimum 70°F rise with incoming
water temperature of 110°F for a final rinse
temperature of 180°F at 20 psi (flowing).
• The dishwasher, with the booster, can operate at
full capacity with back-to-back cycles (SD3).
• SD3 machines are available in several operating
voltages for single or three phase operation.
ELECTRICAL SPECIFICATIONS
Model Electrical Specs Rated Amps
Minimum Supply
Circuit Conductor
Ampacity
Maximum
Overcurrent
Protective Device
SD3 with Electric
Heat
208-240/60/1 43.0 50 50
208-240/60/3 24.9 30 30
480/60/3 13.4 15 15
Booster Ampacity
Ratings 8.5KW
208-240/60/1 35.4 50 50
208-240/60/3 20.4 30 30
480/60/3 10.2 15 15
Optional SD3 Single
Point Electrical
Service Connection
208-240/60/3 45.4 60 60
480/60/3 23.7 30 30
WATER SUPPLY REQUIREMENTS
Model Temperature
(minimum)
Flowing
Pressure
Hardness
grains/gal.1Chlorides ppm Water Usage
SD3 -P (Plain) 140°F 20±5 psi Under 3
1 to 3 ≤ 50 0.74 gal/rack
SD3-H (Hot) 110°F
SD3 Series - GENERAL
Page 3 of 37 F45576 (1015)
WATER SUPPLY REQUIREMENTS
Model Temperature
(minimum)
Flowing
Pressure
Hardness
grains/gal.1Chlorides ppm Water Usage
1 Water hardness below 4 grains/gal requires water treatment to reduce potential corrosion. Hardness
above 6 grains/gal should be treated by water conditioner, water softener or in-line treatment.
MACHINE CYCLE TIMES AND CAPACITY (RACKS / HOUR)
Model Cycle
Settings
Time in Seconds (maximun time settings)
1st 1/2 Fill 2nd 1/2 Fill Wash
Duration1Dwell2Rinse2Sani-Dwell2
All
1
Variable up
to 150
Variable
75-120
38 (38-99)
2 (2-15) 10 (10-35) 7 (7-15)2 120
4 360
1 Machine cycles 1, 2, and 4 are selected via the keypad. Cycle 1 wash duration is adjustable through the
SERVICE PROGRAMMING mode, where the wash time can be adjusted to values above NSF minimums.
2 Dwell, rinse and sani-dwell times are adjustable to values above NSF minimums. Times chosen for each
parameter will apply to all cycle selections.
REFERENCE MATERIAL
For replacement parts, refer to SD3 Catalog of
Replacement Parts.
Refer to Lubrications Manual F-20067 for current
values.
For operation and care instructions, refer to
Operator's Manual.
POWER-UP
On power-up, the control board will perform a
self-test. Once the control successfully
completes and exits the selftest routine, the
machine is ready for operation.
FILL CYCLE
The fill consists of two parts. The first part of the fill is
defined as the time required to fill the tank until the
float switch 1FS closes (150 seconds maximum). The
time duration for the second part of the fill is equal to
the time elapsed for the first part of fill multiplied by
1.25 (75 seconds minimum, 120 seconds maximum).
The chamber door must be closed for the fill/rinse
solenoid (1SOL) to be energized and begin filling the
tank. Opening the chamber door before the float
switch is closed will de-energize the fill/rinse solenoid
1SOL suspending the fill cycle. When the chamber
door is closed, the fill cycle will continue. If the
chamber door is opened any time after the float switch
is closed, the fill cycle will be terminated, even if
second part of fill did not complete. When the chamber
door is closed after the float switch is closed, a wash
cycle will begin.
If the float switch does not close after the maximum
allowed time for the first half of fill (150 seconds), an
[ E2 ] error code will be displayed. To clear an error
from the display, cycle power by turning the machine
off then back on. When the float switch closes, the
controls will begin regulating tank heat. When the fill
cycle is complete, the FILL icon turns off while the tank
temperature continues to be displayed. The machine
will continue heating the tank as required to reach and
maintain the tank heat set point.
BOOSTER TEMPERATURE
CONTROL
Booster Temperature Control
NOTE: The Rinse Assurance is on by default for an
SD3. Adjustments to this selection can be made by
the service technician through CONTROL BOARD
PROGRAMMING.
Once the initial fill is complete, if no cycles are run, the
booster has eight minutes to reach its set point. If the
booster does not reach temperature within the eight
minute timeout, an error code [ EE ] will be displayed.
To clear an error from the display, cycle power by
turning the machine off then back on.
SD3 Series - GENERAL
F45576 (1015) Page 4 of 37
The control board is programed to cause the booster
heater to turn on at the beginning of every rinse cycle
and turn off at the end of the cycle. This occurs even
if the booster water temperature meets or is above the
booster temperature set point. Should the booster
temperature be below the set-point, the booster
heater will remain energized until set-point is
achieved.
If the booster water temperature is below the booster
temperature set point at the end of a wash cycle, and
Rinse Assurance is enabled, the wash cycle will be
extended (maximum total wash time is one minute).
The extended wash time allows the booster water
temperature to reach set point before the rinse cycle
begins.
The tank float also controls the heat for the booster. If
the float is down (float switch open), the booster heater
circuit will be disabled. If the float is up (float switch
closed), the control board will regulate the booster
heat as needed.
READY MODE
When a cycle is not in progress, the machine will be
maintained in a ready state. In the ready state, tank
and booster temperatures are maintained. If water
level drops below the tank float in ready mode, tank
and booster heating elements are de-energized and a
fill cycle will be initiated the next time the chamber
door is opened and then closed. An error code [ Ed ]
will be displayed indicating the machine has a slow
leak. To clear an error from the display, cycle power
by turning the machine off then back on.
RUNNING A CYCLE
After the fill cycle is complete, a cycle is initiated by
raising and lowering the chamber door.
NOTE: If the chamber door is raised any time during
a cycle, the wash pump and rinse solenoid will
deenergize. The control will start a new cycle once the
chamber door is closed.
CHANGING CYCLE TIME
Changing Cycle Time
Wash cycle duration can be selected at any time
whether the machine is at rest or in a cycle. Pressing
the CYCLE button will step through the pre-
programmed timed cycle selections 1, 2, or 4. The
selected cycle time will be retained by the control even
when power is removed and turned back on.
Cycle selection 1 is programmable allowing the wash,
dwell, rinse, and sani-dwell times to be changed from
the default settings. Refer to SERVICE
PROGRAMMING for procedures on altering the pre-
programmed times of cycle one.
NOTE: Cycle 1's times cannot be adjusted below the
NSF minimums.
LUBRICATION
Component Lubrication Type
Impeller O - Ring P 80® Rubber Lube
Booster Heater Screws Never Seez
All NPT Fittings Pipe Thread Sealant,
Locktite 565
High-Limit Thermostat
1TAS Thermal-Joint Compound
High-Limit Thermostat
3TAS (Booster Option.) Thermal-Joint Compound
TOOLS
• Standard set of hand tools.
•VOM with A/C current tester (any quality VOM
with a sensitivity of at least 20K ohms per volt can
be used).
• Anti Static Kit
• Temperature Tester.
• Clamp on type amp meter for meausring heating
element current draw.
SD3 Series - GENERAL
Page 5 of 37 F45576 (1015)
SERVICE PROCEDURES AND ADJUSTMENTS
CONTROL BOARD
PROGRAMMING
Certain procedures in
this section require electrical test or
measurements while power is applied
to the machine. Exercise extreme
caution at all times and follow Arc Flash
procedures. If test points are not easily
accessible, disconnect power and
follow Lockout/Tagout procedures,
attach test equipment and reapply
power to test.
NOTE: The control board is mounted in the machine
in such a way that the printing is upside down. The
control board will be depicted in the manual as it is
found on the machine for consistency purposes.
NOTE: Prior to removing board from machine, check
and note the settings of the programmable variables
as outlined under SERVICE PROGRAMMING when
possible. When unable to access Service
Programming, check with establishment manager to
determine customer control settings.
NOTE: The replacement control board will come
programmed as a different model. Step through this
procedure to set up the control board to function as an
SD3.
1. Remove FRONT COVER.
2. Open control door.
3. Carefully short the two FACTORY pins of J5
together and press the ON key on switch
membrane keypad (user controls on front of
machine). Keep short across pins of J5 until
display indicates [ 88 ], then remove the short.
A. Display will cycle between [ SET ty ] and
[ Sd, fd, GL, AS, HL, or St ].
NOTE: SD3 machine type designation is [ St ].
Fig. 1
4. Program the control board using the information
retrieved from the board being replaced and the
information found in CONTROL BOARD
PROGRAMMING table.
5. Use the SELECT switch on control board to
select the feature and the (up arrow) switch to
change the feature settings.
Fig. 2
NOTE: The display will alternate between the feature
and setting.
6. Press OFF key on switch membrane keypad
(user controls on front of machine) to store
selections.
7. Program the variables. Refer to SERVICE
PROGRAMMING.
8. Close control door.
9. Check machine for proper operation by running
one fill cycle and two normal cycles.
SD3 Series - SERVICE PROCEDURES AND ADJUSTMENTS
F45576 (1015) Page 6 of 37
CONTROL BOARD PROGRAMMING
Feature Description Display Setting Display
Machine Type ty
Standard 1
Not Applicable in SD3
Sd
Not Applicable in SD3 fd
Not Applicable in SD3 GL
Not Applicable in SD3 AS
Not Applicable in SD3 HL
SD3 St
ID Id
Hot SD3 with Booster H
Chemical C
Plain SD3 No Booster P
Rinse Assurance tc Yes2yE
No no
Manual Temperature Control tr These parameters are not available for SD3. If either one of
these are displayed, return to MachineType and select [ St ].
Flow Options FL
Diagnostics override dG Show Error Codes21
Disable Error Codes 2
Shorted water thermistor
detections SP These parameters are not available for SD3. If either one of
these are displayed, return to MachineType and select [ St ].
1 Default setting.
2 This feature is not available on SD3 - Plain or Chemical models.
SERVICE PROGRAMMING
Certain procedures in
this section require electrical test or
measurements while power is applied
to the machine. Exercise extreme
caution at all times and follow Arc Flash
procedures. If test points are not easily
accessible, disconnect power and
follow Lockout/Tagout procedures,
attach test equipment and reapply
power to test.
SD3 Series - SERVICE PROCEDURES AND ADJUSTMENTS
Page 7 of 37 F45576 (1015)
NOTE: Service programming mode can be accessed by two methods.
Entering Programming Mode When Machine is OFF
1. Remove front cover.
2. Open control door.
3. Press and hold the PROG switch on the control board, then press the ON key on the switch membrane keypad
(user controls on front of machine) to enter programming mode.
A. Release PROG switch when display shows [ 88 ].
Entering Programming Mode When Machine is ON (Tank Temperature Displayed and Fill Cycle is Complete)
1. Remove FRONT COVER.
2. Open control door.
3. Press and hold the PROG switch on the control board, then press the CYCLE key on the switch membrane
keypad (user controls on front of machine) to enter programming mode.
A. Release PROG switch when display shows [ 88 ].
Programming Mode
NOTE: Refer to SERVICE PROGRAMMING CHART.
1. Change each function setting by pressing the (up arrow) switch on board until correct value is entered.
2. Press the SELECT switch on the board to enter next function.
NOTE: Pressing the OFF key on display keypad at any time during programming will store your selections.
Fig. 3
3. To exit service programming and store your selections do one of the following:
A. Press OFF key (machine will shut down).
B. Press PROG switch (machine will stay on with tank temperature being displayed).
C. Close control door.
D. Check for proper operation by running one fill cycle and two normal cycles.
SD3 Series - SERVICE PROCEDURES AND ADJUSTMENTS
F45576 (1015) Page 8 of 37
SERVICE PROGRAMMING CHART
PARAMETER DISPLAY PROGRAMMING
VARIABLES DEFAULT
ICONS NUMERIC VALUE
Tank Temperature SET
WASH
Programmed
Temperature
Chemical Models:
120-150°F 130°F
Hot Models: 150-170°F 158°F
Plain Models: 150-170°F 158°F
Booster Temperature (Hot
Machines Only
SET
RINSE
Programmed
Temperature
180 - 195°F (Hot Models
Only) 186°F
Cycle 1 Wash Time SET
WASH
Programmed Wash
Time 38 - 99 seconds 38 sec.
Dwell Time (all cycles) SET
[1dt] Alternating with
Programmed Dwell
Time
2 - 15 seconds 2 sec.
Rinse Time (all cycles) SET
RINSE
Programmed Rinse
Time 10 - 15 seconds 10 sec.
Sani-dwell Time (all cycles) SET
[dt] Alternating with
Programmed Sani-
Dwell Time
SD3 -H and -P
7 - 15 seconds 7 sec.
SD3 - C
dE = disabled; 1 - 15
seconds
dE
°F or °C
Display
SET
°F or °C No Numeric Display °F,° C °F
Idle Shut Down Time SET
IdL
[IdL] Alternating with
Programmed Shut
Down Time in Hours
dE = 0 = disabled; 0 - 12
(hours) 6
Empty Water Level Detection 1SET Present Sensitivity
Setting 20 - 80 60
Clean Float Setting 1SET Present Sensitivity
Setting or [dE] 0 - 18 15
1 Although parameter is adjustable, this setting has no affect on the float switch circuit of SD3 machines.
SD3 Series - SERVICE PROCEDURES AND ADJUSTMENTS
Page 9 of 37 F45576 (1015)
TANK HEATER - TEST
Certain procedures in
this section require electrical test or
measurements while power is applied
to the machine. Exercise extreme
caution at all times and follow Arc Flash
procedures. If test points are not easily
accessible, disconnect power and
follow Lockout/Tagout procedures,
attach test equipment and reapply
power to test.
NOTE: Tank must be filled with water (float switch
closed) in order to test tank heat circuit.
1. Remove FRONT COVER.
2. Open control door.
3. Apply power to machine.
A. Measure incoming voltage across line side
of the tank contactor 2CON and verify it
matches machine specifications on data
plate.
4. Verify the following conditions are met.
A. Tank is full of water.
B. Float switch 1FS is closed.
C. Wash tank thermistor 1QTM is good, not
open or shorted.
D. There is a demand for heat (tank water
temperature is below set point).
5. Turn machine on.
Shorting J8 terminals together without
having water in the tank may result in damaging the
tank heater.
A. If temperature control circuit is not calling for
heat (relay board TANK HEAT LED not lit),
run machine through a cycle to activate tank
heater. Alternately, short the relay board
TANK HEAT (AM) -J8 pins together to
energize the tank heater.
Fig. 4
6. While the TANK HEAT (AM) LED is on, verify that
the tank heat contactor 2CON is energized.
A. If contactor is not energized, check for
120VAC across coil.
1) If 120VAC is not present, check high
limit thermostat 1TAS.
B. If contactor is energized, check:
1) Voltage across all legs on load side of
contactor.
2) Current flow through all elements of
heater.
RATED TANK HEATER ELEMENT CURRENTS
Voltage/Phase Amperes Power (Watts)
208/60/1 26A 5.4kW
240/60/1 30A 7.2kW
208/60/3 15A 5.4kW
240/60/3 17.3A 7.2kW
480/60/3 6A 5kW
7. If the current reading on any of the elements is
not correct:
A. Check the contacts of contactor 2CON.
B. Check the wash tank heater element
resistance.
INDIVIDUAL TANK ELEMENT RESISTANCE
Voltage Cold Resistance
208 - 240V 21.7 - 25.1Ω
480V 105 - 121.7Ω
SD3 Series - SERVICE PROCEDURES AND ADJUSTMENTS
F45576 (1015) Page 10 of 37
This manual suits for next models
2
Table of contents
Other STERO Dishwasher manuals
