Merco 27008 Service Manual

SERVICE MANUAL

(DOMESTIC & INTERNATIONAL)

FRIED FOOD HOLDING STATION

FFHS 27000 SERIES

Merco Savory, LLC

1111 North Hadley Road

Fort Wayne, Indiana 46804

United States of America

Phone : [phone]

U.S. Fax: [phone] • Int’l Fax: [phone]

Technical Service Hot Line

[phone]

www.mercosvory.com

FFHSserviceman REV: 11/10/08

TABLE OF CONTENTS

CURRENT UNITS (WITH “CENTER” ON/OFF SWITCHES)
SPECIFICATIONS FOR 27000, 27001, 27002…………………………………………………………………… 3

SPECIFICATIONS FOR 27007, 27008, 27012, 27014…………………………………………………………… 4
SPECIFICATIONS FOR 27016 (with remote switch)………………………………...…………………………… 5
WIRING DIAGRAMS……………………………………………………………………………...………………….. 6
SEQUENCE OF OPERATIONS………………………………………………………………………………..…… 7
REMOVAL INSTALLATION & ADJUSTMENTS (27000, 27001, 27002)…………………………….………… 8
REMOVAL INSTALLATION & ADJUSTMENTS (27007, 27008, 27012, 27014, 27016)…….………………. 10
PARTS BREAKDOWN (27007, 27008, 27012, 27014, 27016)………………………………………………..… 12
EXPLODED VIEW DIAGRAM (27007, 27008, 27012, 27014, 27016)…………………………………………. 13
PARTS BREAKDOWN (27000, 27001, 27002)………………………………..………………………………..… 14
EXPLODED VIEW DIAGRAM (27000, 27001, 27002)…………………………………...………………………. 15

OUTDATED UNITS (WITH “RIGHT-SIDE” ON/OFF SWITCHES)
SEQUENCE OF OPERATIONS (27000, 27002)……………………………………………………… …….……. 17

SPECIFICATIONS (27000, 27002)……………………………………………………………………………….… 17

WIRING DIAGRAMS (27000, 27002)…......................................................................................................... 18

SEQUENCE OF OPERATIONS (27007, 27012)……………………………………………………… ………….. 19
SPECIFICATIONS (27007, 27012)……………………………………………………………………………….… 19
WIRING DIAGRAM (27007, 27012)………………………………………………………………………………… 19
PARTS BREAKDOWN (27000, 27002 – S/N 1083327 & BELOW)…………………………………………….. 20
EXPLODED VIEW DIAGRAM (27000, 27002 – S/N 1083327 & BELOW)…………………………………….. 21
PARTS BREAKDOWN (27000, 27002 – S/N 1083328 & ABOVE)…………………………………………..…. 22
EXPLODED VIEW DIAGRAM (27000, 27002 – S/N 1083328 & ABOVE)…………………………………….. 23
PARTS BREAKDOWN (27007, 27012)……………………………………………………………………………. 24
EXPLODED VIEW DIAGRAM (27007, 27012)………………………………………………………………….… 25
REMOVAL INSTALLATION & ADJUSTMENTS (27000, 27002)……………………………………………..…. 26
REMOVAL INSTALLATION & ADJUSTMENTS (27007, 27012)……………………………………………..…. 31

FFHS 27000 Series Service Manual

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SPECIFICATIONS FOR 27000, 27001, 27002, 27017

Item # Voltage Amps Watts Hz Phase Cord/Plug

27000 208 VAC 21.6 4500 60 1 6’ NEMA L6-30P
27001 208 VAC 21.6 4500 60 1 6’ NEMA L6-30P
27002 240 VAC 18.8 4500 60 1 6’ NEMA L6-30P

27017* 208 VAC 21.6 4500 60 1 6’ NEMA L6-30P

*27017 includes drop-in shelf.

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SPECIFICATIONS FOR 27007, 27008, 27012, 27016

Item Voltage Amps Watts Hz Phase Cord/Plug

27007 120 VAC 12.0 1450 60 1 5’ NEMA 5-15P

27008 (CE) 230 VAC 7.5 N/A

27012 120 VAC 15.4 1860 60 1 5’ NEMA 5-20P

27016* 120 VAC 12.0 1450 60 1 5’ NEMA 5-20P

*27016 includes drop-in shelf.

FFHS 27000 Series Service Manual

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SPECIFICATIONS FOR 27016 with Remote Switch

SPECIFICATIONS FOR 27017 with Remote Switch

Available only on model 27016

Remote
Switch

Pan
Assembly

Available only on model 27017

FFHS 27000 Series Service Manual

Remote
Switch

Pan
Assembly

5

WIRING DIAGRAM FOR 27007, 27008, 27012, 27016

WIRING DIAGRAM FOR 27000, 27001, 27002

FFHS 27000 Series Service Manual

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SEQUENCE OF OPERATIONS
MODELS 27000, 27001, 27002

Power Supply

Heating Circuit

Cool Down Circuit

SEQUENCE OF OPERATIONS
MODELS 27007, 27008, 27012, 27016

Power Supply

Heating Circuit

Electrical power is supplied to the unit by a 3
conductor service for single phase.
Black conductor is hot.
White conductor is neutral.
Green and yellow conductor is ground.
Power is permanently supplied to one of the normally
open contacts of the main switch, also to the normally
open contacts of relay and the normally open cool
down thermostat.

Closing the main power switch supplies power to the
coils of relays, power is supplied to the main fan
motor. The contacts of R1 and R2 close supplying
power to the main heater.

As the temperature reaches 200°F, the cool down
thermostat closes. When the main switch is turned off,
the main fan will continue to run until the temperature
drops to 160°F.

Electrical power is supplied to the unit by a 3
conductor service for single phase.
Black conductor is hot.
White conductor is neutral.
Green and yellow conductor is ground.
Power is permanently supplied to one of the normally
open contacts of the main switch also to one side of
the normally open contacts of the main heater relay.

Closing the main power switch feeds power through
the normally closed high limit thermostat to the coil of
the main relay. Its contacts now close supplying
power to the main heater. Also for air circulation
power is supplied to the main fan motor.

FFHS 27000 Series Service Manual

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REMOVAL, INSTALLATION AND ADJUSTMENTS
(NEW STYLE CENTER SWITCH UNITS)

MODELS 27000, 27001, 27002

SWITCH, ON-OFF

1. Remove screws from face of switch mounting plate.

2. Disconnect wires from switch assembly. Mark wires for reinstallation.

3. Depress clips on side of switch and remove switch from panel.

4. Install new part, reassemble in reverse order, and check operation.

SWITCH, COOL-DOWN MOTOR

1. Lift and set aside pan tray and grease pan weldment.

2. Remove screws from both left and right outer formed panels.

3. Lift and set aside blower cover weldment.

4. Remove exhaust panel by sliding forward (toward on/off switch) and set panel aside.

5. Remove inner formed base by sliding forward (toward on/off switch).

6. Disconnect wires from end of cool-down motor switch. Mark wires for reinstallation.

7. Remove screws from cool-down motor switch to remove switch.

8. Install new part, reassemble in reverse order, and check operation.

HIGH LIMIT THERMOSTAT

1. Lift and set aside pan tray and grease pan weldment.

2. Remove fourteen (14) screws from both left and right outer formed panels.

3. Lift and set aside blower cover weldment.

4. Remove exhaust panel by sliding forward (toward on/off switch) and set panel aside.

5. Remove inner formed base by sliding forward (toward on/off switch).

6. Disconnect two (2) wires from end of high limit thermostat. Mark wires for reinstallation.

7. Remove two (2) screws from the high limit to remove thermostat.

8. Install new part, reassemble in reverse order, and check operation.

POWER CORD 250V 30A

1. Lift and set aside pan tray and grease pan weldment.

2. Remove screws from both left and right outer formed panels.

3. Lift and set aside blower cover weldment.

4. Disconnect power cord L1 and L2 wires from wire terminal connections. Mark wires for

5. Remove ground nut from power cord ground wire.

6. Compress cord strain relief to remove power cord from bracket.

7. Install new part, reassemble in reverse order, and check operation.

CAUTION:

!

reinstallation.

Disconnect power supply before servicing or cleanin g this toaster. Safeguard power
so it cannot be accidentally restored. Failure to do so could result in dismemberment,
electrocution, or fatal injury.

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HEATER 208V, 240V

1. Lift and set aside pan tray and grease pan weldment.

2. Remove screws from both left and right outer formed panels.

3. Lift and set aside blower cover weldment.

4. Remove exhaust panel by sliding forward (toward on/off switch) and set panel aside.

5. Remove inner formed base by sliding forward (toward on/off switch).

6. Remove screws from element bracket.

7. Loosen screws from air duct base next to element bracket for element removal.

8. Disconnect wires from heater and remove heater. Mark wires for reinstallation.

9. Install new part, reassemble in reverse order, and check operation.

BLOWER

1. Lift and set aside pan tray and grease pan weldment.

2. Remove screws from both left and right outer formed panels.

3. Lift and set aside blower cover weldment.

4. Disconnect wires from blower. Mark wires for reinstallation.

5. Remove nuts from base of blower assembly and remove blower assembly.

6. Install new part, reassemble in reverse order, and check operation.

POWER RELAY

1. Lift and set aside pan tray and grease pan weldment.

2. Remove screws from both left and right outer formed panels.

3. Lift and set aside blower cover weldment.

4. Disconnect wires from relay. Mark wires for reinstallation.

5. Remove screws from relay and remove power relay.

6. Install new part, reassemble in reverse order, and check operation.

FFHS 27000 Series Service Manual

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REMOVAL, INSTALLATION AND ADJUSTMENTS
(NEW STYLE CENTER SWITCH UNITS)

MODELS 27007, 27008, 27012, 27016

CAUTION:

!

SWITCH, ON-OFF

1. Remove two (2) screws from face of switch mounting plate.

2. Disconnect three (3) wires from switch assembly. Mark wires for reinstallation.

3. Depress clips on side of switch and remove switch from panel.

4. Install new part, reassemble in reverse order, and check operation.

POWER CORD 120V

1. Lift and set aside pan tray and grease pan weldment.

2. Remove fourteen (14) screws from both left and right outer formed panels.

3. Lift and set aside blower cover weldment.

4. Disconnect power cord neutral and L1 wires from in-line wire terminal connections. Mark wires for
reinstallation.

5. Remove ground nut from power cord ground wire.

6. Compress cord strain relief to remove power cord from bracket.

7. Install new part, reassemble in reverse order, and check operation.

HEATER 120V

1. Lift and set aside pan tray and grease pan weldment.

2. Remove fourteen (14) screws from both left and right outer formed panels.

3. Lift and set aside blower cover weldment.

4. Remove six (6) screws from air intake baffle.

5. Remove two (2) screws from bottom of exhaust panel and set panel aside.

6. Remove inner formed base by sliding forward (toward on/off switch).

7. Remove three (3) screws from base of blower assembly.

8. Remove two (2) screws from both left and right air duct fillers.

9. Slide out blower and heater assembly from blower seal bracket.

10. Remove four (4) screws from side of heater to separate heater from blower.

11. Disconnect two (2) wires from heater and remove heater. Mark wires for reinstallation. Note the
path of the wires for reinstallation.

12. Install new part, reassemble in reverse order, and check operation.

Disconnect power supply before servicing or cleanin g this toaster. Safeguard power
so it cannot be accidentally restored. Failure to do so could result in dismemberment,
electrocution, or fatal injury.

FFHS 27000 Series Service Manual

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BLOWER

1. Lift and set aside pan tray and grease pan weldment.

2. Remove fourteen (14) screws from both left and right outer formed panels.

3. Lift and set aside blower cover weldment.

4. Disconnect two (2) wires from blower. Mark wires for reinstallation.

5. Remove three (3) screws from base of blower assembly.

6. Remove two (2) screws from both left and right air duct fillers.

7. Slide out blower and heater assembly from blower seal bracket.

8. Remove four (4) screws from side of heater to separate heater from blower.

Install new part, reassemble in reverse order, and check operation.

POWER RELAY

1. Lift and set aside pan tray and grease pan weldment.

2. Remove screws from both left and right outer formed panels.

3. Lift and set aside blower cover weldment.

4. Disconnect wires from relay. Mark wires for reinstallation.

5. Remove screws from relay and remove power relay.

6. Install new part, reassemble in reverse order, and check operation.

FFHS 27000 Series Service Manual

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