INSTRUCTION
MANUAL
STERO SD3
Door-Type Dishwasher
MODEL:
SD3
ML-130232
STERO, a division of Illinois Tool Works, Inc. 1758 Corporate Circle Petaluma, CA 94954
Phone: 800-762-7600 Fax: 707-762-5036 Website: Stero.com
ST50408 (01/17)
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| STERO SD3 DOOR-TYPE DISHWASHER
TABLE OF CONTENTS
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Unpacking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Installation Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Corner Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Water Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Plumbing Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Drain Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Water Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Without Electric Booster Water Heater. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
With Electric Booster Water Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7
7
7
8
8
Venting Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Electrical Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dishwasher without Electric Booster. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Motor Rotation (Three-Phase Machines Only). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dishwasher With Electric Booster (Separately Connected) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10
10
10
11
Equipment Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Exhaust Fan Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Remote Booster Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Detergent, Rinse Aid, Sanitizer Dispensers – Tubing Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Detergent Dispenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rinse Aid Dispenser. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chemical Sanitizer Dispenser. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12
12
12
12
Detergent, Rinse Aid, Sanitizer Dispensers – Equipment Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Detergent Dispenser (Figure 17). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Rinse Aid / Sanitizer Dispenser(s) (Figure 17) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Sanitizing Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Preparation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Dishwashing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Do's and Don'ts for Your Stero Dishwasher . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Delime Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Wash Arms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
STERO SD3 DOOR-TYPE DISHWASHER |
PRESSURE
GAUGE
Installation,
Operation
and Care of
SD3
DISHWASHER
SAVE THESE INSTRUCTIONS
Figure 1
GENERAL
The SD3 dishwasher can be configured for both straight through or corner operation. SD3 dishwashers are
shipped from the factory in straight-through configuration. Straight-through machines can easily be converted
to corner operation.
SD3 dishwashers are designed to operate in one of two modes: Hot water sanitizing mode (designated by the
letters “SH” or “SP” on the display when the machine is turned on), or a chemical sanitizing mode (designated
by the letters “SC” on the display when the machine is turned on).
The serial number can be found on the machine data plate located on the bottom of the front panel. The pump
motor is rated 2 H.P. and has thermal overload protection.
DO NOT attempt to operate this dishwasher in the chemical sanitizing mode without a properly installed, NSF
Certified, chemical sanitizer feeder (customer supplied). Contact an authorized detergent representative for
information about a chemical sanitizer feeder.
The fill line incorporates an atmospheric vacuum breaker to prevent any reverse flow of water from the dishwasher into the potable water supply. The unit, once turned on, fills the wash tank to the appropriate level
and automatically stops filling once the level is reached. A float, located in the wash tank, shuts off the heat
supply if the water level becomes too low. When the water returns to the proper level, the heating circuit is
again operational.
A frame-mounted 8.5 kW electric booster water heater is available as an option for models equipped with
electric tank heat. For SD3 models, the booster water heater is designed to maintain a minimum final rinse
temperature of 180°F provided the incoming water to the booster heater is at least 110°F.
High-temperature SD3 models typically require a hood or vent over the dishwasher to meet local codes.
Low-temperature chemical sanitizing machines or low usage electric heat dishwashers may not require individual venting of the machine if the room is amply exhausted. Refer to page 9 for venting and hood requirements.
Verify with local codes for final authority.
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| STERO SD3 DOOR-TYPE DISHWASHER
START-UP CHECKLIST
BEFORE POWER IS APPLIED
____ 1. Check all utility service connections for tightness (electric, hot water and drain(s)).
____2. Verify drain is connected with air gap (per your local code) and properly draining.
____3. Check for any loose hardware.
____4. Check door to table for interference.
____5. Check free rotation of wash/rinse arms.
____6. Check to see that all strainer pans, buckets, and screens are in place.
AFTER POWER IS APPLIED AND WATER TURNED ON
____ 1. Verify water supply is connected properly and not leaking.
____2. Verify correct supply voltage and phase to machine and confirm with data plate ratings.
____3. Close door and allow machine to fill completely.
____4. Allow wash tank to achieve proper operating temperature.
RUN A 1 MINUTE CYCLE
____ 1. Check operation of door interlock switch.
____2. Check for proper pump motor operation and check for leaks.
____3. Check for proper tank temperatures with pumps on and off.
____4. Check wash tank for proper water level during start up and operation.
____5. Verify final rinse temperature.
REINSTALL ANY PANELS REMOVED
STERO SD3 DOOR-TYPE DISHWASHER |
INSTALLATION
UNPACKING
Immediately after unpacking the dishwasher, check for possible shipping damage. If this machine is found to
be damaged, save the packaging material and contact the carrier within 15 days of delivery.
Prior to installation, test the electrical service to make sure it agrees with the specifications on the machine
data plate; this includes the optional electric booster, if equipped. The dishwasher data plate is located at the
bottom of the front panel.
INSTALLATION CODES
Installation must be in accordance with state and local codes, or in the absence of local codes, with the
National Electrical Code ANSI/NFPA 70 (latest edition). In Canada, the installation standard is: CSA C22.2 No. 1
­(latest editions).
LOCATION
Before finalizing the location, make sure that consideration has been given for the electrical conduit, water
supply, drain connection, venting (if applicable), tabling (if needed), chemical feeder replenishment (if applicable) and adequate clearance for opening the door.
The dishwasher must be level before any connections are made. Turn the threaded feet (Figure 2) as required
to level the machine and adjust to the desired height.
The edge of the dish table that overhangs the SD3 wash tank should be turned down and fitted over the top
of the dishwasher tank (Figure 3). Apply an NSF approved sealant between the overhang of the dish table and
the inner wall of the wash tank to prevent leakage (Figure 3). Fasten the dish tables to the inner wall of the
wash tank with non-rusting truss head screws or rivets (Figure 3).
For straight-through installations, clearance at the front and 15 inches out from the dishwasher at the right
side by 27 inches above the finished floor must be provided for servicing.
DISH TABLE
WASH TANK
DISH TABLE
DISH TABLE
MACHINE LEG
ADJUSTABLE FOOT
NUT
MACHINE SCREW
OR RIVET
SEALANT
INNER WALL OF
WASH TANK
STRAIGHT-THROUGH OPERATION SHOWN
Figure 3
Figure 2
5
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| STERO SD3 DOOR-TYPE DISHWASHER
INSTALLATION
(continued)
CORNER INSTALLATION
Before placing the dishwasher in its operating location, check machine configuration. If the machine is being
installed in a corner (Figure 4), clearances of 20" out from the dishwasher under the left-hand tabling by 27"
above the finished floor and 15" out from the dishwasher at the right side by 27" above the finished floor must
be provided for servicing. For proper installation of a corner machine, the control and display should be positioned at the front corner for operator access (Figure 4).
For corner installation, rotate the rack track so the guide rail is positioned on the left side (Figure 5). For corner
machines, remove the front door deflector (unscrew three bolts / nuts).
WASH TANK
DISH TABLE
GUIDE RAIL
RACK TRACK
DISH TABLE
MACHINE SCREW
OR RIVET
SEALANT
NUT
INNER WALL OF
WASH TANK
CONTROLS MUST BE ACCESSIBLE AT
FRONT CORNER.
DISH TABLE
Figure 5
CORNER OPERATION SHOWN
Figure 4
For corner installations, tabling with backsplashes over
6" high require that a notch be provided to prevent
interference with the door mechanism (Figure 6).
6.000
6.000
A NOTCH MUST BE ADDED TO BACKSPLASHES
OVER 6" HIGH ON CORNER MACHINES TO PREVENT
INTERFERENCE WITH DOOR MECHANISM. NOTCH
MUST EXTEND 6" FROM FACE OF THE MACHINE.
Figure 6
INSTALLATION
STERO SD3 DOOR-TYPE DISHWASHER |
(continued)
WATER REQUIREMENTS
Proper water quality can improve warewashing performance by reducing spotting, lowering chemical supply
costs, improving productivity and extending equipment life. Local water conditions vary from one location to
another. The recommended proper water treatment for effective and efficient use of this equipment will also
vary depending on the local water conditions. Ask your municipal water supplier for details about local water
specifics prior to installation.
Recommended water hardness is 3 grains of hardness per gallon, or less. Chlorides must not exceed 30 parts
per million. Water hardness above 3 grains per gallon should be treated by a water conditioner (water softener or in-line treatment). Water treatment has been shown to reduce costs associated with machine cleaning,
reduce the need for deliming the dishwasher and reduce detergent usage.
Sediment, silica, chlorides or other dissolved solids may lead to a recommendation for particulate filtration or
reverse osmosis treatment.
If an inspection of the dishwasher or booster heater reveals lime build-up after the equipment has been in
service, in-line water treatment should be considered, and, if recommended, should be installed and used as
directed. Contact your local service provider for specific recommendations.
PLUMBING CONNECTIONS
Plumbing connections must comply with applicable sanitary, safety, and plumbing
codes.
Drain Connection
The drain connection is a 11 ⁄ 2" externally threaded pipe connected straight
down from the bottom of the wash tank (Figure 7). The connection can be
made in any direction by using the proper fitting (not supplied) and routing to
the appropriate drain line.
If a grease trap is required by code, it should have a minimum flow capacity
of 14 gallons per minute.
DRAIN
Figure 7
Water Connection
A suitable water hammer arrestor should be installed in the water line just ahead of the dishwasher.
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| STERO SD3 DOOR-TYPE DISHWASHER
INSTALLATION
(continued)
Without Electric Booster Water Heater
The water supply line is connected to the line strainer (top rear, Figure 1) with 3 ⁄4 inch or 1 ⁄ 2 inch pipe. A manual
shutoff valve and pipe union are required (customer supplied).
REQUIRED INCOMING WATER TEMPERATURE
Model
Sanitizing Mode
Connection
Without Built-in Booster
Hot Water Sanitizing
Without Built-in Booster
With Built-in Booster
Water Supply
Minimum
Maximum
Recommended
Hot Water
180°F (82°C)
194°F (90°C)
180°F (82°C)
Chemical Sanitizing
Hot Water
120°F (49°C)
N/A
140°F (60°C)
Hot Water Sanitizing
Hot Water
110°F (43°C)
N/A
140°F (60°C)
For the SD3 model, proper dishwasher operation requires a flowing pressure of 20 ± 5 psig at the dishwasher.
If the flowing pressure exceeds 25 psig, a pressure reducing valve (customer supplied) must be installed in the
water supply line. A pressure gauge (Figure 1) is provided (not installed) for verification of proper water pressure. The water pressure is monitored when the solenoid valve is open and water is flowing.
The water pressure regulator must have a relief by-pass. Failure to use the proper type of pressure
regulator may result in damage to the unit.
With Electric Booster Water Heater
The water supply line is connected below the booster with the line strainer (supplied) and 3 ⁄4" pipe. A ­manual
shut-off valve and pipe union are required (not supplied).
The water supply must have a minimum temperature of 110°F (43°C), and a flowing pressure of 20 ± 5 psig at
the pressure gauge on top of the machine. If the flowing pressure exceeds 25 psig, a pressure reducing valve
(not supplied) must be installed in the water supply line.
Incoming water temperature below 110°F (43°C) may require longer wash cycle time than the 57 second cycle;
refer to OPERATION, pages 15 – 16.
When the fill / final rinse valve is on, water from the booster tank enters the dishwasher through the final rinse
arms. During the rinse cycle, this water is 180°F (82°C). A small amount of water will likely dribble out of the
lower rinse arm into the tank between cycles due to the natural expansion of water as it is being heated.
STERO SD3 DOOR-TYPE DISHWASHER |
INSTALLATION
(continued)
VENTING REQUIREMENTS
NOTE: Any listed and labeled factory-built commercial exhaust hood tested in accordance with UL Standard
710 by a nationally recognized testing laboratory, must be installed according to the terms of its listing and the
manufacturer’s installation instructions.
Rate of Exhaust Flow Calculations
Based on the 2009 International Mechanical Code.
➤
The minimum net airflow for Type II hoods used for dishwashing appliances shall be 100 cfm per linear foot of
hood length. The net quantity of exhaust air shall be calculated by subtracting any airflow supplied directly to
a hood cavity from the total exhaust flow rate of a hood.
➤
➤
CLEARANCE
HEIGHT
LENGTH
➤
TH
WID
➤
➤
Figure 8
TABLE A: HEAT DISSIPATION
Model
Hot Water Sanitizing
SD3
Chemical Sanitizing
SD3
Electric Heat
8.5 kW
Electric Booster
Latent Heat
(BTU/HR)
4,400
Sensible
Heat (BTU/HR)
1,900
X
10,500
4,500
4,300
1,900
X
X
X
Assumptions:
1. Machines operate 70% of each hour while in use.
2. All heat dissipated enters the room for chemical sanitizing models, 60% of heat enters room for hot water
sanitizing models with hood.
3. 70% of heat output is latent, 30% is sensible.
4. Chemical sanitizing models operate at 60% of the heat output of equivalent hot water sanitizing models.
9
10 | STERO SD3 DOOR-TYPE DISHWASHER
INSTALLATION
(continued)
ELECTRICAL CONNECTIONS
Electrical and grounding connections must comply with the applicable portions of
the National Electrical Code, NFPA 70 (latest edition) and / or other local electrical codes.
Disconnect the electrical power to the machine (both dishwasher and booster if
applicable) and follow lockout / tagout procedures. Be sure all circuits are disconnected.
Refer to the wiring diagram attached inside the front trim panel and to the machine data plate for service size
requirements when connecting the dishwasher. Refer to Electrical Data, below.
To access the controls area, remove the right side panel, remove the front panel and open the control panel
door. The dishwasher electrical service connection can be made through the 13 ⁄ 32" diameter hole for 3 ⁄4"trade
size conduit located on the right side at the rear of the machine. By removing a knockout, this hole can be
enlarged to 13 ⁄ 8" diameter for 1" trade size conduit, if required.
ELECTRICAL DATA
Models
Volts / Hz / Ph
Tank Heat
SD3
208 - 240 / 60 / 1
208 - 240 / 60 / 3
480 / 60 / 3
Electric
Electric
Electric
Minimum Circuit Ampacity
Maximum Protective Device
AMPS
Optional 8.5 KW Electric Booster
Optional Single Point
Dishwasher
8.5 KW
Electrical Connection
ONLY
Booster
3 Phase Only
ONLY
Dishwasher and Booster
50
50
N/A
30
30
60
15
15
30
Compiled in accordance with the national electrical code, NFPA 70 (latest edition).
A fused disconnect switch or circuit breaker (customer supplied) must be installed in the electrical service line(s)
supplying this dishwasher and should meet the requirements of your local electrical code.
Dishwasher without Electric Booster
For single-phase machines, power supply connections are made to terminal blocks. For three-phase machines
connections are made to contactor lugs. The machine must be grounded according to electrical code(s); a
grounding lug is provided in the controls area.
Direction of Rotation of Pump
This procedure applies to 3 phase machines upon initial set up or when the pump has been replaced.
Turn on the machine and let it finish the startup making sure there is water in the tank. Start a wash cycle and
after motor starts, carefully insert a plastic wire tie into the back housing of the motor so that it touches the
fan blades. Look for an arrow on the pump that shows the direction of rotation. If the plastic wire tie is pushed
towards the opposite direction of the arrow then the pump
MOTOR SHAFT
direction needs to be reversed.
CAUTION: Make sure the power is removed from the
machine before changing wires.
To reverse the direction of the motor, swap the positions of
two of the 3 phase wires from the machine’s power supply.
Check again the direction of rotation after the adjustment
using the method described above.
Figure 9
STERO SD3 DOOR-TYPE DISHWASHER | 11
INSTALLATION
(continued)
Dishwasher With Electric Booster (Separately Connected)
Single phase machines with an electric booster require two separate connections, one for the booster and the
other for the dishwasher (including motor, controls and tank heat). For single-phase machines, all power supply connections are made to terminal blocks (Figure 10). The single phase dishwasher is connected to terminal
block 1TB in the controls area. The single phase booster is connected to terminal block 2TB in the controls area.
If the machine is three phase, the electrical connection for the dishwasher is made to the contactor 2CON in
the controls area. The electrical connection for the three phase booster is made to the contactor 3CON in the
controls area (Figure 11).
Figure 10
Figure 11
EQUIPMENT CONNECTIONS
Electrical and grounding connections must comply with the applicable portions of
the National Electrical Code, NFPA 70 (latest edition) and / or other local electrical codes.
Disconnect the electrical power to the machine (both dishwasher and booster if
applicable) and follow lockout / tagout procedures. Be sure all circuits are disconnected.
Exhaust Fan Control
The exhaust fan control feature is standard on model SD3. The exhaust fan control relay provides switch
­contacts only and does not provide power to the exhaust fan motor. The rating for an exhaust fan control
relay connected to terminals VFC1 and VFC2 is 1.5 Amps at 240 Volts maximum. When the dishwasher is
connected to the exhaust fan, the exhaust fan is switched on when the dishwasher is on, and off when the
dishwasher is off.
Remote Booster Control
The booster control feature is standard on model SD3. The load rating for remote booster control connections
to BSTR1 and BSTR2 is 0.1 Amp. at 120 Volts maximum. The booster control provides a control signal only and
does not provide power to the remote booster. When a remote booster is connected to the dishwasher, the
booster is on when the dishwasher is on and off when the dishwasher is off.
12 | STERO SD3 DOOR-TYPE DISHWASHER
INSTALLATION
(continued)
DETERGENT, RINSE AID, SANITIZER DISPENSERS – Tubing Installation
Detergent, rinse aid and/or sanitizer dispensers (not provided by Stero) must have all connections sealed against
leakage.
The dishwasher uses .97 gallons of rinse water per rack at a flow rate
of 5.8 gallons per minute at 20 psig flowing pressure. This information is used when setting the detergent, rinse aid or sanitizer pumps.
DETERGENT SENSOR PORT
Detergent Dispenser
The dishwasher has two 7⁄ 8" diameter plugged holes, one on the rear
of the chamber and one on the lower part of the tank near the pump
(Figure 12). With the tank empty, remove both plugs to install the
detergent dispenser.
• The chamber hole is for installation of the detergent feeder
tube.
• The lower tank hole is used for installation of the detergent
sensor.
Figure 12
Rinse Aid Dispenser
The rinse line flange connector on top of the dishwasher has two 1 ⁄8" NPT
pipe plugs (Figure 13). • Remove the plug(s) (Figure 13) for installation of the rinse aid dispenser tube and / or chemical sanitizer tube, as needed.
PIPE PLUGS
Chemical Sanitizer Dispenser
When the dishwasher is to be operated in the chemical sanitizing mode,
the machine must be converted to low-temperature sanitization (refer to
Setup, page 14). A chemical sanitizer dispenser that has been tested and
certified by NSF International must be installed.
•Remove the pipe plug (Figure 13) for installation of
the chemical sanitizer tube. To assure an unobstructed
flow of sanitizer, locate the sanitizer tube in the center
of water flow by drilling the sanitizer tube fitting so
that its inside diameter is equal to the outside diameter of the tube. Slide the tube into the flange until it
touches the opposite side and then pull it back out 1 ⁄4"
(Figure 14).
•Rate for 6% Sodium hypochlorite (bleach) – 4 ml.
within 10 seconds (maximum).
• Rate for 8.4% Sodium hypochlorite (bleach) – 3 ml.
within 10 seconds (maximum).
• Rate for 12% Sodium hypochlorite (bleach) – 2 ml.
within 10 seconds (maximum).
Figure 13
Sanitizer Tube
Top of Dishwasher
Rinse Line
Flange Connector
Slide tube in until it
touches, then pull it
out 1/4"
1/4"
Figure 14
STERO SD3 DOOR-TYPE DISHWASHER | 13
INSTALLATION
(continued)
DETERGENT, RINSE AID, SANITIZER DISPENSERS – Equipment Connections
Electrical and grounding connections must comply with the applicable portions of
the National Electrical Code, NFPA 70 (latest edition) and / or other local electrical codes.
Disconnect the electrical power to the machine (both dishwasher and booster if
applicable) and follow lockout / tagout procedures. Be sure all circuits are disconnected.
This machine must be operated with an automatic detergent feeder and, if applicable, an automatic chemical
sanitizer feeder, including a visual means to verify that detergents and sanitizers are delivered or a visual or
audible alarm to signal if detergents and sanitizers are not available for delivery to the respective washing
and sanitizing systems. Refer to the installation section of this manual and to the chemical feeder equipment
manual(s).
Detergent Dispenser (Figure 15)
Terminals DPS1 and DPS2 are supplied with controlled machine line voltage. They are ON during the wash
cycle and OFF between cycles or when the machine power supply is OFF. Maximum rating for detergent dispenser connected to DPS1 and DPS2 is 1.5 Amps at line voltage. Check the machine supply voltage and use
corresponding feeder transformer voltage. Use UL Listed 600 volt minimum insulated wire for the connections.
Do not use bell wire, lamp cord or similar type wire. Splice connections, if required, must be made in the
feeder transformer junction box - not in the main controls enclosure. Remove 7⁄8" diameter cap plug(s) for 1 ⁄ 2"
trade size conduit fittings from the rear of the enclosure. Remove the side panel. Strain relief fittings must be
­provided for all wiring.
Rinse Aid / Sanitizer Dispenser(s) (Figure 15)
RIGHT SIDE OF
CONTROL AREA
TRANSFORMER
GROUND LUG
Figure 15
SECONDARY
SECONDARY
TRANSFORMER
PRIMARY
— VFC1
— VFC2
— BSTR1
— BSTR2
— DPS1
— DPS2
— RPS1
— RPS2
PRIMARY
Terminals RPS1 and RPS2 are supplied with controlled machine line voltage and are ON during the rinse cycle
only. Maximum rating for rinse aid dispenser connected to RPS1 and RPS2 is 1.5 Amps at line voltage. Check the
machine supply voltage and use corresponding feeder transformer voltage. Use UL Listed 600 volt minimum
insulated wire for the connections. Do not use bell wire, lamp cord or similar type wire. Splice connections, if
required, must be made in the feeder transformer junction box (supplied by others) — not in the main controls
­ nclosure.
enclosure. Remove 7⁄8" diameter cap plug(s) for 1 ⁄ 2" trade size conduit fittings from the rear of the e
Strain relief fittings must be provided for all wiring.
DETERGENT
DISPENSER
RINSE AGENT
DISPENSER
CHEMICAL
SANITIZER
DISPENSER
14 | STERO SD3 DOOR-TYPE DISHWASHER
INSTALLATION
(continued)
SD3 SETUP
Sanitizing Mode
1. With the machine OFF, press and hold the OFF key.
2. Press and release the ON key.
H
°C
C
°C
P
°C
°F
SET
The display initializes until 88 displays.
3. Release the OFF key.
SET X°F°C displays. X can be H, C or P:
°F
SET
H = Hot Water Sanitizing, Internal Booster
C = Chemical Sanitizing, No Booster
SET
°F
P = Hot Water Sanitizing, External Booster
4. Press CYCLE to select P, H, or C as the sanitizing mode.
After 15 seconds, the selection is saved and the machine turns off.
OPERATION
PREPARATION
The overflow tube must be in its proper location below the strainer pan (Figure 16). Place the strainer pan and
the strainer bucket in their proper positions (Figure 17).
STRAINER BUCKET
OVERFLOW TUBE
STRAINER PAN
Figure 17
Figure 16
An automatic detergent dispenser is required. Closely follow supplier’s instructions.
Close the door; this will automatically close the drain.
STERO SD3 DOOR-TYPE DISHWASHER | 15
OPERATION
(continued)
Press the ON button to turn the power on (Figure 18). If the machine’s door is closed and no water is in the
tank, the fill cycle will begin automatically. During the fill cycle, the word FILL is displayed.
Figure 18
When washing or in idle mode, the readout displays the wash temperature. During the rinse cycle, the rinse
icon and temperature are displayed. Select the wash cycle: 1 for normal serving ware, 2 or 4 for pots and pans.
Each wash cycle is followed by an automatic rinse. When the rinse cycle is complete and the rinse icon turns off,
the door can be opened.
DISHWASHING
Scrape the dishes to remove large particles of food and debris. Never use steel wool on ware to be loaded into
the dishmachine.
Figure 19
Arrange the dishes in a rack. Do not stack dishes one on top of another, as water must have free access to all
sides of every dish. Stand plates and dishes up edgewise in a peg-type rack (Figure 19). Cups, glasses, and bowls
should be inverted in an open-type or compartment type rack (Figure 19). Silverware and other small pieces
may be scattered loosely over the bottom of a flat bottom rack.
Do not allow foreign objects to enter the unit, especially metallic contaminants.
After filling a rack, open the door, slide the rack into the dishwasher and close the door.
Throughout the wash cycle, the tank water temperature is displayed on the front panel display, along with the
word WASH and an icon. During the rinse cycle, the rinse water temperature is displayed, along with the word
RINSE and an icon. When the rinse cycle is completed, the readout displays the tank water temperature.
16 | STERO SD3 DOOR-TYPE DISHWASHER
OPERATION
(continued)
To add a dish after the wash cycle has started, open the door slightly. Wait 10 seconds to allow the wash arm
to coast down and to avoid water splashing before opening the door fully.
Operating temperatures for all models are as follows:
Sanitizing Mode
Wash Temperature
Rinse Temperature
Minimum Wash
Recommended Wash
Minimum Rinse
Recommended Rinse
Hot Water
150°F (66°C)
150°F (66°C)
180°F (82°C)
180°F (82°C)
Chemical
120°F (49°C)
140°F (60°C)
120°F (49°C)
140°F (60°C)
CLEANING
The machine must be thoroughly cleaned at the end of each working shift or at least daily. Never use steel
wool to clean warewasher surfaces. Use only products formulated to be safe on stainless steel.
1. Push the OFF button.
2. Open the machine door.
DRAIN LEVER
3. Clean off the dish tables into the dishwasher.
4. Drain the machine by lifting up the drain lever (Figure 20).
5. Thoroughly cleanse and flush the dishwasher interior. Remove
remaining soil with a soft cloth or brush and mild cleanser. Rinse
again.
6. Remove and empty the strainer bucket and pan. Wash and rinse
them thoroughly.
7. Clean the pump cover with a soft cloth or brush. Do not allow
food soil to accumulate on the tank bottom or to enter the drain.
Figure 20
8. Remove the overflow tube. Wash and rinse the overflow tube inside and out.
9. Make sure that the wash and rinse arms rotate freely and are free of any obstructions. If not, remove arms
and clear out any obstructions.
STERO SD3 DOOR-TYPE DISHWASHER | 17
CLEANING
(continued)
10. Remove and check wash arms and rinse nozzles (Figures 21 & 22) to make sure they are free of any lime
and solids. Refer to Maintenance, page 18.
Do not bang wash arms or rinse arms to clean.
11. Replace all removed parts. Leave machine door open to allow interior to air out and dry.
WASH ARM
RINSE ARM
WASH ARM
HAND KNOB
RINSE ARM
HAND KNOB
Figure 21
Figure 22
DO’S AND DON’TS FOR YOUR NEW STERO DISHWASHER
DO assure proper water hardness (3 grains or less per gallon is recommended).
DO pre-scrap dishes thoroughly.
DO use only detergents recommended by your chemical professional.
DO at the end of the day, thoroughly cleanse the machine, rinse and dry (leave door open).
DO closely follow your chemical professional’s prescribed deliming schedule.
DO use only products formulated to be safe on stainless steel.
DO NOT use detergents formulated for residential dishwashers.
DO NOT allow food soil to accumulate on the tank bottom.
DO NOT exceed chemical manufacturer’s recommended concentrations for detergent, sanitizer,
rinse aid or lime scale remover.
DO NOT use steel wool to clean ware or warewasher surfaces.
DO NOT allow foreign objects to enter the unit, especially metallic contaminants such as paper clips,
retainers, etc.
NOTE: Failure to follow use, care and maintenance instructions may void your Stero warewasher
warranty.
18 | STERO SD3 DOOR-TYPE DISHWASHER
MAINTENANCE
DELIME INSTRUCTIONS
Delime is necessary if deposits are visible inside or outside the machine or at a minimum of once per month.
Follow the instructions below:
DELIME INSTRUCTIONS
1. Remove rack, drain tank, press “OFF”.
2. Press and hold “CYCLE” & “ON” for 3 seconds;
close door, unit fills then indicates “ADD DELIME”.
3. Open door & add delime agent per supplier
instructions for 14 gallon tank.
4. Close door, pump starts & display flashes “DELIME”.
After 12 minutes display scrolls “DRAIN”.
5. Check interior, close door to run additional cycles
if necessary.
6. Drain tank, turn unit off.
Disconnect the electrical power to the machine (both dishwasher and booster if
applicable) and follow lockout / tagout procedures. Be sure all circuits are disconnected.
WASH ARMS
Upper and lower wash and rinse arms (Figures 21 & 22) should turn freely and continue turning for a few
seconds after being whirled by hand. To check, rotate arms and remove any obstructions causing improper
operation.
If either the strainer pan or the strainer bucket is not properly in place, obstructions (such as food particles or
bones) may clog the wash arm nozzles. The wash arms are easily removed for cleaning.
To remove the lower wash arm, unscrew the hand knob and lift the rinse arm off (Figure 21). The wash arm can
be lifted off once the rinse arm is removed.
The upper wash and rinse arms are removed by unscrewing the hand knob (Figure 22) and lowering both arms
together. Be careful not to drop these arms.
STERO SD3 DOOR-TYPE DISHWASHER | 19
TROUBLESHOOTING
This section outlines various symptoms and possible causes that may be encountered in the event of abnormal
machine operation. If symptoms persist after possible causes have been checked, service may be required.
Symptom
Possible Causes
No machine operation.
1. Machine off, turn machine on.
2. Blown fuse or tripped circuit breaker at power supply.
3. Check tank water level.
Dishes not clean.
1. Insufficient wash water due to drain obstruction preventing proper drain closing.
2. Worn or torn drain O-ring allowing wash water to drain.
3. Loss of water pressure due to pump obstruction.
Disconnect electrical power supply (both dishwasher and
booster if applicable) and drain tank.
Check for any obstruction at the pump intake.
4. Incorrect water temperature. Contact Service for adjustment or repair.
5. Incorrect detergent dispensing. Contact your detergent representative.
6.Excessive mineral deposits throughout wash and rinse system. Deliming may be
necessary, refer to page 18.
7. Check wash and rinse arms to make sure they rotate properly.
8. Strainers clogged causing inadequate water supply to pump; clean machine according to Cleaning, page 16.
9. Obstruction in wash arms or wash arms will not turn; clean machine according to
Cleaning, page 16.
10. Detergent dispenser may be clogged.
11. Excessive soil quantity; scrape dishes before cycle.
12. Improper rack loading; refer to Preparation and Dishwashing, pages 14 & 15.
13. Incoming water supply turned off.
Spotting silverware,
glasses and dishes.
1. Improperly loaded racks.
2. Incorrect rinse water temperature or rinse pressure.
3. Loss of water pressure due to pump obstruction.
Disconnect electrical power supply (both dishwasher and
booster if applicable) and drain tank.
Check for any obstruction at the pump intake.
4. Excessively hard water.
5. Incorrect detergent for water type.
6. Incorrect rinse additive for water type.
7. Incorrect concentration of detergent, rinse additive and/or sanitizer.
8. Excessive soil quantity; scrape dishes before cycle.
Inadequate rinse
or rinse water
temperature too low.
Possible EE display.
1.Dirty line strainer causing reduced water flow. Turn off water supply, remove
strainer cap, withdraw and clean screen. Reassemble.
2. Low supply line pressure.
3.Excessive mineral deposits throughout wash and rinse system. Deliming may be
necessary, refer to page 18.
4. Incoming water temperature to booster (if applicable) below 110°F. Machine will
automatically extend wash time until booster heats up (this applies to SD3 booster
equipped machines only). 5. If EE displays: Booster did not reach temperature within 8 minutes after initial fill.
Press OFF, wait 5 seconds and press ON. May be booster heater failure.
20 | STERO SD3 DOOR-TYPE DISHWASHER
TROUBLESHOOTING
Symptom
(continued)
Possible Causes
Leaking valve.
1. Foreign material preventing proper valve operation. NOTE: A critical period is soon
after installation when pipe compound or metal shavings may lodge at the valve
seat. Shut off supply line. Unscrew and lift bonnet from valve body. Clean valve
and reassemble.
2. If a solenoid valve is malfunctioning (not opening or not closing), it is recom­mended
that you contact your local service provider.
No wash tank heat.
1. The machine is equipped with a low water safety device which shuts off heat if
the water level drops. Check for proper water level. If the water level is too low,
the overflow tube might be out of position. Or, something may be inhibiting free
movement of the low water float; remove any foreign object from around the
low water float or its magnet.
2. Blown fuse or tripped circuit breaker at power supply.
No or slow fill.
Possible E2 display.
1. Debris may be obstructing standpipe movement allowing fill water to drain.
2. Water supply may be off; make sure hot water supply valve is open.
3. Dirty line strainer causing reduced water flow. Turn off hot water supply, remove
strainer cap, withdraw and clean screen. Reassemble.
4. Worn or torn drain O-ring allowing wash water to drain.
5. If E2 displays: Water did not reach the float during a fill within 2.5 minutes. Press
OFF, wait 5 seconds and press ON.
Possible Ed display.
1. Slow leak. Make sure the drain lever is closed, the standpipe is seated and the O-ring
is clear of all food soil or other debris.
Dribbling water from
lower rinse arm.
1. If equipped with electric booster, normal dripping from the lower rinse arm will
occur during water heating due to expansion of the water. This will occur once
between machine cycles.
2. If water dribbles or leaks continuously from rinse arms on any machine, refer to
Leaking Valve, above.
Possible E6 display.
1. Contact your local service provider.
Wrench lights up and
P1, P2 or P3 displays.
1. Contact your local service provider.
SERVICE
Contact your local Stero-authorized service office for any repairs or adjustments needed on this equipment.
ST50408 (01/17)
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