Merco ST-1 Guida rapida

PARTS & SERVICE for ST-1 Mini Conveyor Toaster

The ST-1 Mini-Conveyor Toaster is engineered for

efficient, dependable service throughout the years.

Like any piece of fine equipment with moving parts

and broad temperature ranges, physical wear takes

its toll. When this happens, the information found in

this manual will prove very helpful. Although the

instructions are easy to follow, all repair procedures

should be carried out by a qualified Merco/Savory

Service Representative.

Description Part # Description Part #

On/Off toggle switch control, 20A 68117 Drive chain assy, 54 links, 208V/240V 12412

Energysaverswitchcontrol 14614 Rear shaft assembly 14603

Heater control 120V, upper or lower 21874 Front shaft assembly 14644

Heater control 208V, upper or lower 14702 Front shaft spacers 14606

Heater control 240V, upper or lower 12355 Rearshaftspacers 14762

Conveyor speed control, 120V 12464 Tension adjusting brackets 12508

Conveyor speed control, 208V / 240V 12425 Bearing retainer brackets 12381

Heater control knob 12919 Bearings 22754

Terminal block 21858 Conveyor belt assembly, SS 58 links 14647

Control panel, blank 14765 Gearmotor, 120V 69716

Control panel decal 14763 Gearmotor, 208V/240V 14674

1” adjustable legs 12668 Cooling fan motor, 120V 14618

5’ cord set, 120V, NEMA 5-15P 26047 Cooling fan motor, 208V 14699

5’ cord set, 208V/240V, NEMA 6-15P 26064 Cooling fan motor, 240V 14675

Strain relief bushing 000171 Fan blade, 5” cw 14619

Right side panel 14554 Toast receiving tray/chute 14590

Left side panel 14556 Fan motor mounting bracket 14658

Topcover 14542 Heating element, 120V, 825W 14648

Chimney 14539 Heating element, 208V, 1200W 14694

Bottom cover assembly 14732 Heating element, 240V, 1200W 14673

On/Off energy toggle switch 18209 Lower element assembly, 120V 14707

Reflector/crumb tray assembly 14568 Lower element assembly, 208V 14722

14Tsprocketassy.Drive208/240V 13733 Lower element assembly, 240V 14724

8T sprocket assembly, 120V 30494 Upper element assembly, 120V 14713

20T sprocket assy. drive shaft 120V 14750 Upper element assembly, 208V 14723

12T sprocket assembly, 208V/240V 69787 Upper element assembly, 240V 14725

Drive chain assembly, 57 links, 120V 13301 Lubricant 21720

1200-JDM 07024

2. The top cover is also held in place with one sheet

metal screw. Remove this screw and slide the top

cover towards the back of the toaster. When

replacing the top cover, be sure that it is properly

positioned in the securing tracks.

3. The bottom cover is secured by two sheet metal

screws. Remove these screws and pull towards

the front of the toaster. NOTE PROPER ORIEN-

TATION OF THE OPEN SIDE OF THE AIR

COOLING VENT. This opening must always face

towards the front of the unit to assure proper

toasterperformance.

B Main Power On/Off Switch

(Figures1&2)

1. Removethe bottomcover.

2. Disconnect the 2 wires at the on/off switch

terminal ends. Note the correct orientation of the

wires.

3. Remove the rubber on/off switch boot (old style

units) and the black plastic mounting bezel.

4. The on/off switch can now be removed from the

back of the control panel.

5. Reverse this procedure to install a new switch.

(Refer to the wiring diagram)

ST-1 PARTS REPLACEMENT

INSRUCTIONS

WARNING

DISCONNECT TOASTER FROM

POWER SOURCE

BEFORE ATTEMPTING ANY SER-

VICE PROCEDURES.

General Information

The information on the following pages will

describe how to replace the most common

components of the ST-1 toaster. Though the

instructions are easy to follow, the work should be

done by a qualified service technician. All replace-

ment procedures will first require the removal of

one or both toaster side panels, and top or bottom

covers.IMPORTANT: Whenremovingor replacing

thebottomtoaster cover, it isextremelyimpor-

tantthatitbepositioned correctly. The open side

aircooling ventshouldbe facingtowardsthe

frontof the unit.Thiswill assure properair

circulationandtoasterperformance.

A Panel Removal

1. The right and left side panels are each secured

to the toaster by one sheet metal screw located

at the back of the unit. Remove this screw and

slide

out the panel. When replacing either panel, be

sure that the panel is properly positioned in

the securing track.

C Conveyor Speed Control/P.C. Board

(Figures1&2)

1. Removebottom cover.

2. Pull off speed control knob and remove the nut

securing the control board panel. Pull out the control

from the back of the control panel.

3. Cut the wire harness tie and disconnect the 2 wire

leads at the wire connectors.

4. Reverse this procedure to install the new assembly.

D Heater Control Switches

(Figures 1 & 2)

1. Removebottom cover.

2. Pull off heater control knob to gain access to the 2

slotted screws that secure the control to the control

panel. Remove these 2 screws.

3. Disconnect the wires from the control terminal ends,

noting the proper orientation of the wires.

4. Install the new control securing with the 2 slotted

screws.

5. Re-attach wires to the terminal ends.

(Refer to the wiring diagram)

E Energy Saver Switch

(Figures1&2)

1. Removebottom cover.

2. On the front of the control panel, unscrew the rubber

switch boot and remove the black plastic mounting

bezel securing the switch to the panel.

3. In order to gain easier access to the back of the

switch, remove the upper heater control, but do not

disconnect the wires.

4. Disconnect the wires from the energy save switch

terminal ends, noting the proper wire orientation.

5. Install the new switch to the back of the control

panel and secure with the black plastic mounting

bezel and rubber boot.

6. Re-attach wires to the terminal ends.

(Refer to wiring diagram)

7. Replace the upper heater control switch.

F Fan / Fan Housing / Fan Motor

(Figure2)

1. Removethe bottomcover.

2. Rotate Fan Blades which will expose 2 nuts

securing the fan housing to the motor. Remove

these two nuts to remove the housing.

3. To remove the fan motor, but do NOT remove the

2 motor mounting bracket nuts. Slide the motor

until clearance is achieved.

4. Cut the wire harness ties to gain access to the

wire connector. Disconnect the 2 wire leads from

the motor, one at the wire connector and one at

the terminal block.

5. Insert the new motor into the motor mounting

bracket and tighten the 2 motor mounting bracket

nuts.

6. Re-attach the two wire leads, one at the wire

connector and one at the terminal block.

(Refer to wiring diagram)

7. Install fan housing and secure with the 2 nuts.

8. IMPORTANT:BESURETORE-TIETHEWIRE

HARNESSSOTHATTHEWIRESDONOTBLOCKTHE

FANFROMSPINNINGFREELY.

G Terminal Block

(Figure2)

1. Remove right side panel and bottom cover.

2. Remove the wires at the terminal ends, noting

proper wire orientation.

3. Remove the 2 nuts securing the terminal block

to the wall of the toaster.

4. Reverse this procedure to install new terminal

block.

(Refer to wiring diagram)

H Gearmotor and Motor Sprocket

(Figures2&3)

1. Remove right side panel and bottom cover.

(SectionA)

2. Loosen the 4 motor mounting screws and slide

motor to achieve slack in the drive chain.

3. Loosen set screw on motor sprocket and

removesprocket.

4. Remove the 4 mounting screws and lift out

motor.

5. Disconnect 2 wire leads from motor, one at the

wire connector and the other at the terminal

block.

6. Reverse this procedure to install the new motor.

(Refer to wiring diagram)

I Drive Chain

(Figures3, 5 & 6)

1. Remove right side panel. (Section A)

2. Loosen, but do NOT remove the 4 mounting

screws. Slide motor to achieve slack in drive

chain and remove chain.

3. When installing new chain, check for proper

chain orientation and tension.

J Conveyor Shaft Sprocket

(Figures3, 5 & 6)

1. Remove right side panel. (Section A)

2. Remove drive chain. (Section I)

3. Loosen set screw on hub of sprocket and slide sprocket off

shaft.

4. When installing new sprocket, make sure set screw rests in

hole of shaft.

5. Replace drive chain. (Section I)

K Conveyor Belt

(Figures3, 4 & 7)

1. Remove right & left side panels. (Section A)

2. Loosen, but do NOT remove the bearing retainer brackets

on both sides of the toaster.

3. Loosen, but do NOT remove the tension adjusting brackets

on both sides of the toaster.

4. Push front conveyor shaft towards the back of the toaster

to loosen belt tension.

5. Separate the conveyor belt at any link and slide out of

toaster.

6. When installing new conveyor belt, check for proper link

orientation. (Figure 6)

7. Starting at front of toaster, slide belt under front shaft and

push towards rear of unit. Bring belt up and over the rear

shaft and pull towards front of toaster. Make sure belt is

resting on both belt support guides. Reconnect links.

CAUTION: Make sure belt is not installed at an angle.

8. Pull forward on front conveyor shaft until excess slack is

removed.

9. Tighten tension adjusting brackets and bearing retainer

brackets on both sides of toaster.

LFront and Rear Shafts and Bearings

(Figures3,4,5, & 6)

1. Remove right and left side panels. (Section A)

2. Toremovefront shaft and front shaft bearings:

Remove bearing retainers on both sides of toaster.

Loosen conveyor belt tension adjusting brackets on

both sides of toaster. Bearings (with shaft) will now

slide out. Note proper orientation of spacers.

3. Toremoverear shaft and rearshaftbearings:

Remove drive chain (Section 1), and conveyor shaft

sprocket (Section J) Remove rear bearing retainer

brackets from both sides of toaster. Bearings (with

Shaft) will now slide out. Note proper orientation of

spacers.

4. Replace bearings, spacers, and shaft. Replace

conveyor belt tension adjusting brackets on front and

rear shafts.

5. Replace conveyor shaft sprocket and drive chain on

rear shaft.

6. Adjust tension of conveyor belt on front shaft to

removeexcess slack.

M Upper Heater Element Assembly

(Figures3,4, 8, 9, & 10 )

1. Remove right and left side panels. Remove top cover

and Chimney. (Section A)

2. Remove the 6 sheet metal screws. ( 3 on each side)

securing the assembly to toaster sides.

3. Disconnect the 2 wires at heating element terminal

ends.

4. Carefully lift out assembly.

5. Reverse this procedure to install new assembly.

(Refer to wiring diagram)

N Lower Heating Element Assembly

(Figures 3, 4, 8, 9 & 10)

1. Remove right and left side panels. (Section A)

2. Disconnect wires from both upper and lower heating

element terminal ends.

3. At left side of toaster, bend the 2 protruding tabs to

achieve clearance through slots.

4. Slide out assembly from right side of toaster.

5. Reverse this procedure to install new assembly.

(Refer to wiring diagram)

O Individual Heating Element

(Figures3,4, 8, 9, & 10)

1. Remove heating element assembly. (Sections M or

2. Remove the two hex head screws securing element

to end plate. Note proper orientation of spacers,

nuts and retainer bars.

3. Bend the holding tabs to achieve clearance of

element.

CAUTION: Check for proper voltage & wattage

stamped on each element before installation.

4. Reverse this procedure to install new element.

P Power Cord

(Figures2&3)

1. Remove right side panel. (Section A)

2. Disconnect green ground wire and the 2 wires at the

large wire connectors.

3. Tilt toaster on back panel. Squeeze strain relief

bushing and pull out from toaster.

4. Reverse this procedure to install new power cord.

(Refer to wiring diagram)

1111 N. Hadley Rd.

Fort Wayne, In. 46804

Tel.800-701-2992

Fax(219) 436-0735 www.mercosavory.com

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