STERO SG Istruzioni per la costruzione
SG, SU-L, SU-H DISHWASHERS
SG
SU-L
SU-H
SERVICE and PARTS MANUAL
F45577 (1215)
TABLE OF CONTENTS
GENERAL .................................................................................................. 4
INTRODUCTION ....................................................................................... 4
MODELSCOVERED ................................................................................... 4
TOOLS ................................................................................................. 4
ELECTRICAL SPECIFICATIONS ....................................................................... 4
ENGINEERINGDATA .................................................................................. 5
INSTALLATION AND OPERATION CYCLES ............................................................ 5
PROGRAMMING MENUS .............................................................................. 6
REMOVAL AND REPLACEMENT OF PARTS ............................................................... 7
CONTROL PANEL SERVICE POSITION ................................................................ 7
LEFTANDRIGHTTRIMPANELS ...................................................................... 7
SWITCH MEMBRANE .................................................................................. 8
CONTROLPANELCOVER ............................................................................. 8
WATER LEVEL SENSORS ............................................................................. 9
CHEMICAL PUMPS - WELCO ......................................................................... 10
DRAINPUMP ......................................................................................... 10
FILLVALVE(1SOL) ................................................................................... 11
RINSEPUMP ......................................................................................... 11
RINSEPROBE(2QTM) ............................................................................... 12
WASH PIPE ASSEMBLY .............................................................................. 13
WASH PUMP/MOTOR (1MTR) ........................................................................ 14
BOOSTERHEATER(SU-H) ........................................................................... 15
BOOSTER THERMISTOR & HIGH LIMIT PROTECTION (SU-H) ....................................... 15
SUMP THERMISTOR & HIGH LIMIT PROTECTION ................................................... 16
AIRGAP .............................................................................................. 16
DOORSWITCH ....................................................................................... 17
SERVICEPROCEDURESANDADJUSTMENTS ........................................................... 18
REPLACEMENT CONTROL BOARD PROGRAMMING ................................................ 18
SERVICE PROGRAMMING (8934) .................................................................... 18
SOAP PROGRAMMING (7627) ........................................................................ 25
MANAGER PROGRAMMING (1001) ................................................................... 27
TESTING SANITIZER (BLEACH) CONCENTRATION (P.P.M.) ......................................... 29
BYPASS WASH/HEAT CYCLES FOR TROUBLESHOOTING .......................................... 30
10KOHMTHERMISTORTEST-BOOSTER(3QTM)&SUMP(1QTM) ................................. 30
PURGEBOOSTER/HOLDINGTANKFORSERVICE ................................................... 31
DOORADJUSTMENT ................................................................................. 31
SUMPHEATERTEST ................................................................................. 32
BOOSTERHEATERTEST ............................................................................ 32
100K OHM THERMISTOR TEST - RINSE PROBE (2QTM) ............................................. 33
ELECTRICAL OPERATION ................................................................................ 34
COMPONENT FUNCTION ............................................................................ 34
COMPONENTLAYOUT ............................................................................... 35
CONTROLBOARDLEDS ............................................................................. 37
CONTROLBOARDTESTPOINTS .................................................................... 38
CONTROL BOARD JUMPERS ........................................................................ 40
CONTROL BOARD WIRE CONNECTIONS ............................................................ 41
POWERSUPPLYBOARDLEDS&TESTPOINTS ..................................................... 42
SU-L&SGWIRINGDIAGRAM ........................................................................ 43
SU-H(3WIRE-1PH)WIRINGDIAGRAM .............................................................. 45
SU-L & SG SEQUENCE OF OPERATION ............................................................. 47
SU-H SEQUENCE OF OPERATION ................................................................... 49
CYCLETIMINGCHART ............................................................................... 52
TROUBLESHOOTING ..................................................................................... 53
SG, SU-L, SU-H DISHWASHERS
F45577 (1215) Page 2 of 59
TOGGLE DIAGNOSTICS .............................................................................. 53
ERRORCODES ...................................................................................... 53
TROUBLESHOOTING GUIDE WARE .................................................................. 55
TROUBLESHOOTING GUIDE MACHINE .............................................................. 56
SG, SU-L, SU-H DISHWASHERS
© COMPETITIVE 2015
Page 3 of 59 F45577 (1215)
PARTS CATALOG .................................................................................... 60
GENERAL
INTRODUCTION
This manual is applicable to the models on the cover
page. Procedures apply to all models unless specified
otherwise.
MODELS COVERED
The SU and SG Series dishwashers are fully
automatic, front-loading dishwashing machines.
SU-L 33 racks per hour
SU-H 31 racks per hour
SG 34 racks per hour
All SU and SG Series dishwashers shut down
automatically 4 hours after last use to conserve
energy.
SU-H dishwashers include Rinse Assurance to insure
proper hot water temperature during rinse.
MODEL DESCRIPTION
SU-L
SG
Fresh water rinse; low-temperature,
chemical-sanitizing models for use
with 6% or 8.40% sodium hypochlorite
solution (bleach) as the sanitizing
agent.
SU-H
Fresh water rinse with a built-in 70° F
rise booster heater. This allows an
incoming water temperature of 110° F.
TOOLS
Standard
• Standard set of hand tools.
• Metric set of hand tools.
• VOM with measuring micro amp current tester.
Any VOM with minimum of CAT III 600V, CE
certified. Sensitivity of at least 20,000 ohms per
volt can be used. In addition, meter leads must
also be a minimum of CAT III 600V.
• Temperature tester (thermocouple type).
• Field service grounding kit.
Special
• Precision Chlorine Test Paper Vial, for testing
sanitizer p.p.m.
• Cleaner used in removal of switch membrane.
• T25 Torx bit. Used in removal of door.
• Service Tool: Used in removal of Wash Pump Nut
and Wash Manifold Nut.
Fig. 1
ELECTRICAL SPECIFICATIONS
NOTE: Always check incoming voltage to verify
service connection meets machine specification.
ELECTRICAL SPECIFICATIONS
Model Volts / Hertz / Phase Rated Amps
Minimum Supply
Circuit Conductor
Ampacity
Maximum Protective
Device Ampacity
SG 120/60/1 15.4 20 20
SU-L 120/60/1 13.4 20 20
SU-H
120/208-240(3W)/60/1 30.5 40 40
NOTE: This system requires three power wires that include a current carrying neutral. An additional
fourth wire must be provided for machine ground.
SG, SU-L, SU-H DISHWASHERS - GENERAL
F45577 (1215) Page 4 of 59
ENGINEERING DATA
3/4 HP pump motor, thermally protected internally, automatic reset.
Required water supply characteristics are as follows:
Model Temperature Flowing Pressure
SG
SU-L 120°F minimum 15 - 65 psi
SU-H 110°F minimum 15 - 65 psi
INSTALLATION AND OPERATION
CYCLES
INSTALLATION
Generally, all installations are made by the
dealer or others contracted by the dealer or
owner.
POWER-UP DIAGNOSTICS
When the Power Button is pressed, the control
board checks the probes and sensors to be
within operational range. Once the self-check is
passed, the machine automatically enters Fill/
Preheat Mode.
NOTE: If there is a detectable water level in the
sump prior to turning the machine on, the
dishwasher will perform a power drain.
PRIMING CHEMICAL PUMPS
Chemical pumps prime on Power Up or at the
start of a Wash Cycle if sensors do not detect
chemicals.
1. Initial prime attempt is 60 seconds.
A. If chemical not sensed "Add Chemical" will
display.
NOTE: The 60 second prime is in intervals of 6
seconds.
2. If not primed after 3 attempts, the "Add
Chemical" indicator will continue to display.
3. Priming is terminated.
4. Reset by cycling power.
5. Once chemical is sensed, pumps continue to
prime for 10 seconds to allow chemicals to reach
machine.
FILL/PREHEAT
Without Booster (SG & SU-L): The holding
tank will fill. The water is then moved through the
rinse arms to the sump. Process repeats until
the sump is at operational water level. Sump
heater maintains wash temperature.
With Booster (SU-H): The booster will fill and
heat to 140°F. The booster water is then moved
through the rinse arms to the sump. Process
repeats until the sump is at operational water
level. Sump heater maintains wash
temperature.
NOTE: If the door is opened during the Fill
cycle, the process is suspended. After door is
closed the process continues where it left off.
NOTE: During the Fill cycle, the detergent pump
is activated for the normal detergent cycle.
READY MODE
While a cycle is not in process, the SU and SG
Series will maintain in idle state. In this mode,
the heat will be maintained in both the sump and
booster. The sump temperature will be
displayed.
NORMAL OPERATION (WASH CYCLE)
After the fill cycle is completed, a wash cycle is
begun by pressing the WASH key.
On 120VAC cold machines, sump heater is de-
energized while wash motor is energized.
If the door is opened during the Wash cycle, the
process is suspended. After door is closed the
process continues where it left off.
During a cycle, both sump and booster heat are
controlled. Hot machines only.
During the wash portion of the cycle, the sump
temperature will be displayed. During the rinse,
the final rinse temperature will be displayed.
RINSE
SG, SU-L, SU-H DISHWASHERS - GENERAL
Page 5 of 59 F45577 (1215)
After the wash cycle ends, water is drained from
the sump to allow for the rinse water from the
holding tank (cold machines) or booster (hot
machines).
POWER-DOWN / DRAIN
When the POWER key is pressed, the unit will
enter a drain cycle. Booster or holding tank will
be purged, and sump will be drained. After the
completion of the drain cycle, power to the
controls is removed under software control. At
this point, the control is inoperable until the
POWER key is pressed.
PROGRAMMING MENUS
There are 3 Programming Menus that can be
accessed when the Menu/Down Arrow button is
selected. Each menu has parameters that can be
changed that affects the way the dishwasher
operates. Each menu is protected by a 4 digit access
code.
Use the arrow keys to change the ( -> ) to the desired
number and press enter to move to the next digit.
NOTE: The Manager Programming menu uses 1001
as the access code. Just select enter to move to the
next digit.
•MANAGER PROGRAMMING (1001)
•SOAP PROGRAMMING (7627)
•SERVICE PROGRAMMING (8934)
SG, SU-L, SU-H DISHWASHERS - GENERAL
F45577 (1215) Page 6 of 59
REMOVAL AND REPLACEMENT OF PARTS
CONTROL PANEL SERVICE
POSITION
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
Certain components in this system are
subject to damage by electrostatic discharge during
field repairs. A field service grounding kit is required
to prevent damage. The field service kit must be used
anytime the control board is handled.
1. Pull dishwasher out from underneath counter.
2. Open door and remove two screws using #3
Phillips screwdriver.
Fig. 2
3. Pull out control cover, then hinge up and back.
Fig. 3
4. Reverse procedure to install.
5. Check for proper operation.
LEFT AND RIGHT TRIM PANELS
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
Certain components in this system are
subject to damage by electrostatic discharge during
field repairs. A field service grounding kit is required
to prevent damage. The field service kit must be used
anytime the control board is handled.
Control Panel Service Position
1. Open door and remove (2) screws.
Fig. 4
2. Slide control cover forward (Approximately 2-3").
Left and Right Trim Panel Removal
1. Remove left and right trim panel screws, using #3
Phillips screwdriver.
Fig. 5
2. Remove left and right trim panels.
3. Close unit door.
SG, SU-L, SU-H DISHWASHERS - REMOVAL AND REPLACEMENT OF PARTS
Page 7 of 59 F45577 (1215)
Left and Right Trim Panel Installation
1. Insert right trim panel notch into right side unit
trim panel latch.
2. Verify bottom right trim panel catch is fastened to
the bottom right lip of the unit.
3. Insert and tighten right trim panel screw. (Fig. 5)
4. Repeat steps 1 - 3 for left trim panel installation.
5. Slide control cover back in place and tighten with
(2) screws. (Fig. 4)
SWITCH MEMBRANE
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
1. Open door and remove screws, using #3 Phillips
screwdriver.
Fig. 8
2. Pull out control cover and disconnect switch
membrane ribbon cable from connector.
3. Pry up switch membrane.
Fig. 9
4. Reverse procedure to install.
NOTE: Before installing replacement membrane, use
cleaner to remove old adhesive and allow to dry.
5. Check for proper operation.
CONTROL PANEL COVER
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
1. Pull dishwasher out from underneath counter,
when CONTROL PANEL SERVICE POSITION
is not possible or entire cover needs replaced.
2. Open door and remove two screws, using #3
Phillips screwdriver.
SG, SU-L, SU-H DISHWASHERS - REMOVAL AND REPLACEMENT OF PARTS
F45577 (1215) Page 8 of 59
Fig. 10
3. Slide control cover forward and disconnect
switch membrane ribbon cable from connector.
4. Loosen nut, washer and center bearing washer
from both sides. (Do NOT remove hardware)
Fig. 11
5. Remove control cover.
6. Reverse procedure to install.
NOTE: Center bearing washer must be centered in
hole to allow rotation.
Fig. 12
7. Check for proper operation.
WATER LEVEL SENSORS
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
1. Remove CONTROL PANEL COVER.
2. Remove LEFT AND RIGHT TRIM PANELS
(Booster/Holding Tank) or LEFT AND RIGHT
TRIM PANELS (Sump tank).
3. Drain sump or Booster/Holding tank below air
trap (1, Fig. 13) inlet.
NOTE: Not draining sump or booster / holding tank
may cause a leak.
Fig. 13
4. Disconnect water level cable from sensor and
tube clamp.
5. Push plastic tabs (using screwdriver or pliers) to
remove.
NOTE: Do NOT over squeeze pinch clamps on
bottom of sensors.
Fig. 14
SG, SU-L, SU-H DISHWASHERS - REMOVAL AND REPLACEMENT OF PARTS
Page 9 of 59 F45577 (1215)
6. Reverse procedure to install.
A. Verify there is no water in air trap.
B. Verify there is no water, kinks or holes in
pressure sensor tubing.
C. Verify tubing clamp is properly installed.
7. Check for proper operation.
CHEMICAL PUMPS - WELCO
If chemical pump label is no longer visible, replace
label to identify pump for future servicing.
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
Fig. 15
NUMBER DESCRIPTION
1Chemical Pump Motor
2Detergent Chemical Pump
3Rinse Aid Chemical Pump
4Chemical Sensor
5Sanitizing Chemical Pump (SU-L & SG
only)
1. Remove front trim panel.
2. Remove clamps and tube and pull from sensor.
3. Remove snap cover.
4. Remove tube from chemical sensor [5].
5. Replace with new chemical sensor [5].
6. Replace snap cover.
7. Replace hose to tube and sensor. Secure with
clamps.
NOTE: Do NOT use zip ties.
NOTE: Do NOT over squeeze clamp. Over squeezing
causes leaks.
Replacing Chemical Pump
1. Twist pump Counter Clock Wise and slide off
shaft.
2. Reverse procedure to install.
DRAIN PUMP
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
1. Remove front trim panel and LEFT AND RIGHT
TRIM PANELS.
2. Remove electrical connections noting their
location.
Fig. 16
3. From left side using a long flathead screwdriver,
GENTLY open tab securing drain pump.
NOTE: Tab is easily broken. Do not need to replace
broken tab.
SG, SU-L, SU-H DISHWASHERS - REMOVAL AND REPLACEMENT OF PARTS
F45577 (1215) Page 10 of 59
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