Dexter Laundry T-900 User manual

8514-244-001 REV PR page 1

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.

8514-244-001 REV PR page 2

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

8514-244-001 REV PR page 3

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.

8514-244-001 REV PR page 4

Figure 1-1: Concrete Pedestal Mounting

Figure 1-2: Floor Outline

8514-244-001 REV PR page 5

Figure 1-3: Machine Mounting Detail

8514-244-001 REV PR page 6

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.

8514-244-001 REV PR page 7

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

8514-244-001 REV PR page 8

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

8514-244-001 REV PR page 9

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

8514-244-001 REV PR page 10

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

Bleach

Starch

Sour/Softener

A and B

C and D

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.

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