Dexter Laundry T-900 User manual

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INDUSTRIAL WASHER
MODEL T-900/950 ON-PREMISE
N-SERIES CONTROL
OPERATOR’S MANUAL
INSTALLATION & OPERATION
INSTRUCTIONS
Please read this information and retain for reference.
WARNING: THIS WASHER IS EQUIPPED WITH DEVICES AND FEATURES RELATING TO ITS SAFE
OPERATION. TO AVOID INJURY OR ELECTRICAL SHOCK, DO NOT PERFORM ANY SERVICING UNLESS
QUALIFIED TO DO SO.
IT IS THE RESPONSIBILITY OF THE OWNER TO CHECK THIS EQUIPMENT ON A FREQUENT
BASIS TO ASSURE ITS SAFE OPERATION.
A machine should NOT be allowed to operate if any of the following occur:
-Excessively high water level.
-If machine is not connected to a properly grounded circuit.
-If the door does not remain securely locked during the entire cycle.
-Vibration or shaking from an inadequate mounting or foundation.
WARNING - SAFETY PRECAUTIONS
-Always shut off power and water supply before servicing.
-Do not overload the washer.
-Do not open door when cylinder is in motion or it contains water.
-Do not bypass any safety devices of this washer.
-Do not use volatile or flammable substances in or near this washer.
-Keep all panels in place. They protect against shock and injury and add rigidity to the washer.
PREVENTIVE MAINTENANCE REQUIREMENTS
DAILY
-Check that the loading door remains securely locked and cannot be opened during an entire
cycle.
-Check the water connections for leaks.
-Clean the top, front, and sides of the cabinet to remove residue.
-Clean the soap dispenser and lid and check that all dispenser mounting screws are in-place and
tight.
-Check the drain valve for leaking and that it opens properly.
-Check the loading door for leaks. Clean the door seal of all foreign matter.
-Leave the loading door open to aerate the washer when not in use.
QUARTERLY
-Make sure the washer is inoperative by switching off the main power supply.
-Check the V-belts for wear and proper tension.
-Clean lint and other foreign matter from around motor.
-Check all water connections for leaks.
-Wipe and clean the inside of the washer and check that all electrical components are free of
moisture and dust.
-Remove and clean water inlet hose filters. Replace if necessary.
-Check anchor bolts. Retighten if necessary
IMPORTANT: Replace any and all panels that were removed to perform daily and/or quarterly
maintenance.

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TABLE OF CONTENTS
1INSTALLATION INSTRUCTIONS ..........................................................................3
1.1 FOUNDATION REQUIREMENTS......................................................................3
1.2 MOUNTING ..................................................................................................3
1.3 PLUMBING ...................................................................................................7
1.4 DRAIN .........................................................................................................7
1.5 PROTECTIVE FILM ........................................................................................7
1.6 ELECTRICAL .................................................................................................7
1.6.1 INSTALLING THE ELECTRICAL CONNECTION...........................................8
1.6.2 FUSING REQUIREMENTS.........................................................................8
1.6.3 CONTROLS TRANSFORMER (208-240V models only) ................................8
1.6.4 MAXIMUM SPIN SPEED ADJUSTMENT......................................................9
1.7 INJECTION SOURCE CONNECTIONS ............................................................10
1.8 OPERATION CHECK ....................................................................................10
2WASHER OPERATION.......................................................................................11
2.1 CONTROL BUTTONS ...................................................................................11
2.2 STARTING THE WASHER.............................................................................12
2.3 OPTIONAL SOAK ........................................................................................13
2.4 END OF CYCLE ...........................................................................................13
2.5 SAFETY DOOR LOCK...................................................................................13
2.6 VARIABLE FREQUENCY DRIVE INDICATORS ................................................13
3MACHINE PROGRAMMING INSTRUCTIONS ........................................................15
3.1 EDITING AN EXISTING CYCLE.....................................................................15
3.2 PROGRAMMING A NEW CYCLE ....................................................................17
3.3 DEFAULT WASHER CYCLE PROGRAMS .........................................................18
3.4 RAPID ADVANCE MODE ..............................................................................30
3.5 DIAGNOSTIC TEST CYCLE...........................................................................31
4TROUBLESHOOTING ........................................................................................34
5SERVICE AND PARTS........................................................................................40
MODEL
T-900/950 60 LB. WASHER
CAPACITY
60 LBS/9 CUBIC FT. (27.2 kg/255 L)
CYLINDER SIZE
30” DIA X 22” DEEP (76 cm X 55.9 cm)
ELECTRICAL
208-240 VAC, 60 HZ, 1 OR 3 PHASE; OR
208-240 VAC, 60 HZ, 3 PHASE ONLY (ELECTRIC HEAT MODEL)
DRIVE SYSTEM
SOFT START REVERSING INVERTER DRIVE
WASH SPEED
43 RPM
INTERMEDIATE EXTRACT
375 RPM (60 G’S)
FINAL EXTRACT
T-900: 484 RPM (100 G’S)
T-950: 685 RPM (200 G’S)
MACHINE CONTROL
PROGRAMMABLE COMPUTER UP TO 30 CYCLES
WATER INLET
SOLENOID OPERATED VALVES, 30-120 PSI
T-900: 2 VALVES, 9 GAL/MIN (34 L/MIN) EACH
T-950: 2 DUAL VALVES 9 GAL/MIN (34 L/MIN) EACH.
2 SINGLE VALVES 12 GAL/MIN (45 L/MIN) EACH.
DRAIN VALVE
3” (76 mm) DIAMETER
Table 1: Washer Specifications

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1INSTALLATION INSTRUCTIONS
All washers must be installed in accordance with all local, state and national
building, electrical, plumbing and other codes in effect in the area.
WARNING:
THESE INSTALLATION AND SERVICING INSTRUCTIONS ARE FOR USE
BY QUALIFIED PERSONNEL ONLY. TO AVOID INJURY AND ELECTRICAL
SHOCK, DO NOT PERFORM ANY SERVICING OTHER THAN THAT
CONTAINED IN THE OPERATING INSTRUCTIONS, UNLESS QUALIFIED.
1.1 FOUNDATION REQUIREMENTS
This machine is designed for use on or over bare concrete floor - not to be
used above combustible flooring, such as carpet or wood. The washer
must be securely bolted and grouted to a substantial concrete floor, or
mounted and grouted upon a suitable base that is securely bolted and
grouted to a substantial concrete floor.
CARE MUST BE TAKEN WITH ALL FOUNDATION WORK TO ENSURE A
STABLE UNIT INSTALLATION, ELIMINATING POSSIBILITIES OF
EXCESSIVE VIBRATION.
All installations require concrete floors 8 inches (203 mm) or thicker.
Anchor bolts or expansion anchors must be of a quality grade and a
minimum of 3/4 inch (19 mm) diameter. Six bolts are required to mount
the washer to the steel base or concrete pad. Mounting hardware is not
provided with the machine.
1.2 MOUNTING
A concrete pedestal or steel-mounting base that elevates the machine
approximately 4 inches (102 mm) above the floor level is recommended to
provide easy access to the loading door. Allow a minimum 24 inches (610
mm) of clearance behind the rear of the machine to provide access for
motor service. Refer to Figures Figure 1-1 and Figure 1-2 for machine
bolt-down dimensions. Contact a Dexter laundry equipment distributor for
recommended steel mounting bases.
If an elevated concrete pedestal is desired, it should be embedded into
the existing floor. Anchor bolts should be 3/4" x 8" (19 mm x 200 mm),
grade 8 or better, headed by a 4 inch (10 cm) square fish plate and
should protrude 2 1/2” (64 mm) above the finished surface of the
pedestal.
EXPANSION ANCHORS ARE NOT RECOMMENDED FOR USE IN CONCRETE
PEDESTALS BECAUSE THE ANCHORS ARE TOO CLOSE TO AN EDGE,
CAUSING IT TO BREAK OUT.
Refer to Figures Figure 1-1 and Figure 1-3 for recommended concrete
pedestal dimensions. Refer to Figure Figure 1-4 for overall machine
mounting dimensions.

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Figure 1-1: Concrete Pedestal Mounting
Figure 1-2: Floor Outline

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Figure 1-3: Machine Mounting Detail

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Figure 1-4: T-900/950 Industrial Washer Mounting Diagram
**NOTE: Top water valves shown in Figure 1-4 are only on T-950 model.

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1.3 PLUMBING
Two (for T-900 models) or four (for T-950 models) 48 inch (1.22 m) water
supply hoses are provided with each machine. The threaded connections
on the hoses are ¾-11 ½ NHT.
Separate hot and cold water lines must be supplied to the machine,
maintaining 30 psi to 120 psi (207 kPa to 827 kPa) water flow pressure. A
140°F (60°C) hot water supply is recommended for best washing results.
Do not exceed 180°F (82°C) water temperature.
1.4 DRAIN
The drain outlet tube at the rear of the machine is 3 inches (76 mm) in
diameter. Any drain hose used must be lower than the drain valve to
assure proper draining.
1.5 PROTECTIVE FILM
The machine may have protective adhesive film on the front control panel
label area and on the front, top, and side stainless steel panels. The film
may be peeled off before putting the machine into service.
1.6 ELECTRICAL
The Dexter T-900/950 single/three-phase 208-240VAC 60 Hz and T-
900/950 three-phase 208-240VAC 60 Hz (with Electric Heater) washing
machines are intended to be permanently installed appliances. No power
cord is provided. The machine should be connected to an individual
branch circuit not shared by lighting or other equipment. The connection
should be sheathed in liquid tight flexible conduit, or equivalent, with
conductors of the proper size and insulation. A qualified technician should
make such connections in accordance with the wiring diagram with a
minimum 12 gauge wire. Select models with the electric heat option
require a minimum 6 gauge wire.
WARNING:
SHUT OFF POWER AND WATER BEFORE OPENING ANY SERVICE
PANELS.
Figure 1-5: Electrical Connections and Chemical Supply Signals

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1.6.1 INSTALLING THE ELECTRICAL CONNECTION
1.6.1.1 Disconnect all power to the washer.
1.6.1.2 Locate the power terminal block cover in the upper
left corner of the machine when viewed from the
back. Remove the screw and lift out the cover.
Connections are as shown in Figure 1-5.
1.6.1.3 If power is 208-240-3PH-60Hz, connect L1, L2, L3
and Ground. If there is a high leg, it must be
connected to L3.
1.6.1.4 If power is 208-240-1PH-60Hz, connect L1, L2 and
Ground.
NOTE: It is important that the grounding screw next to the power
terminal block TB-1 be connected to a good external ground.
1.6.2 FUSING REQUIREMENTS
Single- and Three -phase 208-240VAC 60 Hz models:
20 AMP TIME-DELAY (DUAL ELEMENT) FUSE (or equivalent circuit
breaker)
Three -phase 208-240VAC 60 Hz models with electric heat source:
60 AMP TIME-DELAY (DUAL ELEMENT) FUSE (or equivalent circuit
breaker)
1.6.3 CONTROLS TRANSFORMER (208-240V models only)
The controls transformer is located inside the control trough and
steps a range of 208 to 240 volts down to 115 volts. There are two
terminals on the controls transformer for the primary (incoming)
power. Use the terminal marked “208V” for power supplies
between 208 and 219 volts. Use the terminal marked “240V” for
power supplies between 220 and 240 volts. Refer to Figure 1-6 for
control transformer connections.
Figure 1-6: Control Transformer Connections

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1.6.4 MAXIMUM SPIN SPEED ADJUSTMENT
If desired, the washer can be adjusted to limit the maximum
extract spin speed for all wash cycles.
To make this adjustment, a jumper wire must either be installed or
removed on the Variable Frequency Drive (VFD), depending on the
washer model and desired speed. This Dexter jumper part number
8220-057-036 (qty 1) is factory supplied on terminal points “10V”
and “RC”. Remove this jumper to make new jumper connections if
necessary. Refer to Figure 1-7 for the approximate location of the
control terminations on the Variable Frequency Drive (VFD) and
Table 2 for appropriate jumper connection points indicated with an
“X” for the desired maximum spin speed setting. If no adjustment
to default spin speed is desired, do not remove or add any wires on
VFD.
Figure 1-7: Control Terminations on Variable Frequency Drive
MI1 MI2 MI3 MI4 MI5 MI6
DCM
(Left)
DCM
(Right)
24V ACM AVI ACI 10V M01
60 G X X
80 G X X
100 G
100 G X X
140 G
200 G
T-600, T-900,
T-1200
Default Setting (No Jumper Required)
T-950, T-1450
REMOVE Brown Jumper between MI6/M01
Default Setting (With Factory Installed Brown Jumper)
N Series Washer
Model
Max Spin
Speed
Jumper Terminal Locations on Variable Frequency Drive (VFD)
Table 2: Spin Speed Adjustment Jumper Locations

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1.7 INJECTION SOURCE CONNECTIONS
The washer control may be programmed to send six 120V output signals
for a chemical injection system of up to four chemical sources. There are
convenient electrical connection points for the injection pumps in the rear
of the machine, as shown in Figure 1-5. The four independent pumps can
be controlled through the signals A, B, C and D. The COM shown in Figure
1-5 is the common or return for these injection signals. For the injection
sources, program codes 0 through 6 and their respective terminal block
connections and combinations are as shown in Table 3.
Dexter
Recommended
Connections
Controller
Programmed
Signals
Injection
Terminal Block
Circuits
Detergent
1
A
Bleach
2
B
Starch
3
C
Sour/Softener
4
D
5
A and B
6
C and D
0
None
Table 3: Injection Signal and Circuit Identification
Chemical Injection hoses are to be inserted into the injection inlet at the
upper right rear of the washer. These hoses should be inserted into the
round PVC pipe a minimum of 14" (35.5 cm) and a maximum of 18" (45.7
cm) to eliminate chemical buildup in the pipe and/or restrict water flow to
the tub. Secure the hoses as required.
1.8 OPERATION CHECK
After all mounting, plumbing and electrical work is completed, run through
each step of the diagnostic cycle (cycle #31), detailed in section 3.5, and
a complete wash cycle. Check for water leaks and verify proper operation.
During intermediate spin and final spin, the cylinder should turn in a
counterclockwise direction when viewed from the front of the machine.
If spin is clockwise, the T1 and T2 motor wires connecting to terminal T1
and T2 on the variable frequency drive should be swapped. Remove
power to the machine before opening service panels and swapping wires.