Blodgett U.H.C User Manual

UNIVERSAL HOLDING CABINET

SERVICE AND REPAIR MANUAL

BLODGETT OVEN COMPANY

www.blodgett.com

44 Lakeside Avenue, Burlington, Vermont 05401 USA Telephone (800) 331-5842, (802) 860-3700 Fax: (802)864-0183

PN 33954 Rev B (6/01)

Duplication of the information in this manual is prohibited without the consent of the Blodgett Service Department.

TABLE OF CONTENTS

1. INTRODUCTION

Description 1 --- 1......................................................................

Specifications 1 --- 2....................................................................

2. OPERATION

Control Panel Descriptions 2--- 1.........................................................

Operator Mode 2 --- 2...................................................................

Timer Operation 2 --- 3..................................................................

Meal Selection 2 --- 4...................................................................

Clean Mode 2 --- 5......................................................................

Slot On/Off 2 --- 6.......................................................................

Displaying Slot Temperature Information 2--- 7.............................................

Operating Tips 2 --- 8...................................................................

Sequence of Operation 2 --- 9............................................................

3. PROGRAMMING AND CALIBRATION

Store Manager Programming 3--- 1......................................................

Product Selection for E ach Slot 3--- 1.................................................

Entering and Editing Product Information 3--- 6........................................

More Product Prompt Time Feature 3--- 11.............................................

Changing the Display Time 3--- 12.....................................................

Changing the Display Intensity 3--- 13..................................................

Service Programming and Calibration 3--- 14...............................................

To Access Service Programming 3--- 14................................................

Offset Calibration 3 --- 1 5.............................................................

Display Test Mode 3 --- 1 5............................................................

Timer Fast Test 3 --- 1 5...............................................................

Changing from _Fto_C 3 --- 1 9......................................................

Programming Alarms 3--- 20..........................................................

4. TROUBLESHOOTING

Troubleshooting Elements and Warning Alarms 4---1......................................

Troubleshooting Flow Diagrams 4---4....................................................

Troubleshooting a Locked Out Slot 4---10.................................................

Troubleshooting Sensor Alarms 4---11....................................................

Troubleshooting the Driver Board and Control 4--- 12........................................

TABLE OF CONTENTS

5. PARTS REPLACEMENT

Element or Probe Assembly 5--- 1........................................................

Cooling Blower 5 --- 2...................................................................

Bezel Assembly 5 --- 3..................................................................

Membrane Switch 5 --- 4................................................................

LED Board 5 --- 4.......................................................................

Driver Board 5 --- 5.....................................................................

Temperature P r o b e 5 --- 5...............................................................

Mother Board 5 --- 5....................................................................

Bezel Gasket 5 --- 6.....................................................................

Chip Replacement 5 --- 7................................................................

6. TECHNICAL APPENDIX

Schematic 6 --- 1.......................................................................

Wiring Diagram 6 --- 2...................................................................

Temperature P r o b e 6 --- 3...............................................................

CHAPTER 1

INTRODUCTION

UHC

DESCRIPTION

The Blodgett Universal Holding Cabinet is a short term holding device designed to maintain the freshness of a variety of food product. The UHC contains four product slots which can be controlled independently. Control panels are located above each slot on both the front and rear of the cabinet. All operator mode selections can be made from either the front or rear display.

Power Switch --- controls power to the cabinet.

Product Slot --- holds up to three trays of product

per slot.

Control Panel --- indicates the holding time and product selection for each tray position.

1/3 Size Product Tray --- designed for all grilled products (meat, eggs, chicken). This tray maintains the product’s moisture.

Knockouts for

Double Stacking

1/2 Size Crumb Tray with Wire Rack --- d e s i g n e d for fried products (crispy chicken, nuggets, fillet). The tray keeps the fried crumbs from dropping through the racks. It also allows moisture to escape leaving the outside of the product crispy.

Full Size Product Tray --- designed for bread products (biscuits a nd muffins). This tray allows a small amount of moisture to escape.

Each Universal Holding Cabinet is shipped with the following:

Equipment manual

PM card

Training video

Quick-reference guide

Cleaning brush

Power Switch

Product Slot

Control Panel

FIGURE 1

1 --- 1

SPECIFICATIONS

INTRODUCTION

OVEN CLEARANCES

The following clearances must be available for servicing.

C a b i n e t b o d y s i d e s --- 2 2 ” ( 5 6 c m )

C a b i n e t b o d y b a c k --- 25 ” ( 6 4 c m )

ELECTRICAL SPECIFICATIONS

Electrical Specifications (per section)

KW Hz Vol ts Phase Amps

U.S. and Canadian installations

2.5/3.3 50/60 208/240 1 20

General Export installations

2.5/3.3 50/60 208/240 1 20

TABLE 1

Installation must conformwith local codes, or in the absence of local codes, with the National Electrical

Code, ANSI/NFPA 70 --- Latest Edition and/or Canadian Electrical Code CSA C22.2 as applicable.

Wiring diagrams are located inside the right side panel.

This appliance is equipped with a three-prong grounding plug for your protection against shock hazard and must be plugged into a properly grounded three-prong receptacle. DO NOT cut or

remove the grounding prong from this plug.

CONTROL SPECIFICATIONS

Operating Voltage

Input Voltage 264 VAC maximum

Load Requirements (heaters)

System Operating Environment

Required Handling Precautions

208 VAC +10/ ---15% or 240 VAC+10/--- 15% 50 or 60 Hz

177 VAC minimum

400 watt maximum at 240 VAC, resistive load, 8 heaters per cabinet max.

50-104_F(10-40_C) with 400 ft/minute airflow over circuit board assemblies

Circuits contain sensitive electronic components. DO NOT ship or store near strong electrostatic, electromagnetic, magnetic or radioactive field.

CAUTION: Due to electrostatically sensitive components. All technicians performing service work must be grounded. Grounding may be accomplished using a grounding strap or other suitable means. Connect to another grounded unpowered piece of equipment. (ie. equipment other than the one you are currently working on.)

1 --- 2

TABLE 2

UHC

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1 --- 3

CHAPTER 2

OPERATION

UHC

CONTROL PANEL DESCRIPTIONS

1 1 12 2 25 4 3

UHC Front Control Panel

1 1 12 2 2

UHC Rear Control Panel

FIGURE 1

FRONT CONTROL PANEL

1. TIMER KEYS --- start and stop the timer associated with each tray position. The timer keys also turn off audible alarms. There are three timer keys on each front panel (left, center and right).

2. DISPLA YS --- show product selection and hold time for each tray position. The displays also provide programming information in the program mode. There are three displays on each front panel (left, center and right).

3. MENU KEY --- press to select meal transitions (breakfast to lunch), clean mode operation and to turn individual slots on or off. The menu key also provides access to the program mode.

4. TEMPERATURE/ENTER/PAGE KEY --- this key has three separate functions.

Display slot temperature information

Enter operational changes

REAR CONTROL PANEL

NOTE: The rear panels are used for operational

functions only. All programming must be performed from the front panels.

1. TIMER KEYS --- start and stop the timer associated with each tray position. The timer keys also turn off audible alarms. There are three timer keys on each front panel (left, center and right).

2. DISPLA YS --- show product selection and hold time for each tray position. There are three displays on each front panel (left, center and right).

Select page parameters in program mode.

5. UP and DOWN ARROW KEYS --- press to increase/decrease variables or change selections.

2 --- 1

OPERATOR MODE

OPERATION

The operator mode is the normal operating mode of the controller when all slots are at the proper temperature and no alarm conditions exist. Product information and hold time are displayed.

SLOT TEMPERATURE CONTROL

Each product selection has its own temperature setpoint and product hold time. All product timers run independently.

The slot temperature is controlled by the temperature setpoint of the left most product entry in each slot as viewed from the front of the cabinet (side with the On/Off switch). Product selections that have a hold temperature different than the left most

SAUS

!.!.!

Use first timer

(highest intensity)

(medium intensity)

product selection will not be available for entry into that slot’s configuration.

DISPLAY INFORMATION

In the operator mode the slot displays provide the following information:

The product selection for each tra y location.

The hold time remaining (in minutes) for active timers.

NOTE: An active timer alternately displays the

product selection and the time remaining. Inactive timers display only product selection.

Active timer

Inactive timer

(lowest intensity)

.!.!.!.

Running dots (decimal points)

FIGURE 2

2 --- 2

UHC

TIMER OPERATION

NOTE: If more than one tray of product is timing,

the tray with the least hold time remaining is indicated by the Use First display.

Starting a timer

1. Press the TIMER KEY above t he desired tray position to start the timer. The timer counts down from a preset value and alternately displays product selection and the hold time remaining.

Stopping a timer

1. Press the TIMER KEY above the slot position to turn off an active timer. The timer stops timing. The display changes to the inactive status.

Timing out

1. The time out alarm alerts t he operator that the product hold time has expired. When the hold

SAUS

.!.!.!.

time remaining reaches zero an audible alarm sounds and the display reads --- 0 0 --- .

NOTE: The audible alarm is indicated by a

modulating tone. A continuous tone signals a warning alarm.

All other active displays in the cabinet switch to the lowest intensity level until the audible alarm is turned off.

2. Press the TIMER KEY to clear the timed out display and silence the alarm.

If other timers in the cabinet have timed out, the audible alarm remains on until all timed out displays are cleared.

3. When all timers are cleared, active timers return to normal status. The Use First status is switched to the next timer with the least hold time remaining.

!.!.!

SAUS

.!.!.!.

Display alternately indicates hold time and product selection for active timers.

--- 0 0 ---

Press timer key to stop or silence a timer

Press timer key to start a timer

!.!.!

SAUS

.!.!.!.

Use First indication changes to the next active timer

FIGURE 3

2 --- 3

MEAL SELECTION

OPERATION

Selecting breakfast and lunch

NOTE: The following example is for selecting

breakfast. The same procedure applies for selecting lunch.

1. Press the MENU KEY to change the product selection of the slot from breakfast to lunch. All displays are highlighted.

2. Press the ENTER KEY to activate the meal selection. The displays switch to the inactive mode.

NOTE: If the enter key is not pressed within

five seconds, the product selection returns to the breakfast meal selection.

Changing meal selections

Active slots with active timers will not change to the new meal selection until the timer(s) are stopped or time out and are reset. Active timers are stopped by pressing the timer key.

If t h e product selection for the meal h a s a hold temperature different than the current meal, a high or low temperature alarm is displayed to alert the operator that the hold temperature is being changed. Should the high or low temperature condition remain for two or more minutes, an audible alarm sounds. (See page 4--- 1 of the Troubleshooting section.) To silence the alarm press any timer key. This does not affect the timer operation unless the timer key is pressed again. The display alternately indicates the product selection and the alarm message until the slot temperature is within the preset limits.

If no keys are pressed, the alarm message automaticallyresets when the slot temperature is within the preset limits.

NUGG

Press menu key to display inactive meal selection

NUGG NUGG

Press enter key to enter meal selection and return to normal display mode

FIGURE 4

2 --- 4

UHC

CLEAN MODE

The clean mode changes the temperature setpoint of all slots in the cabinet to 125_F(52_C).

To s t a r t the clean mode

1. PresstheMENUKEYtoscrolltotheclean mode message, CLN MODE.

2. Press the ENTER KEY to activate the clean mode. All slots change to clean mode.

NOTE: If the enter key is not pressed within 5

seconds the control returns to the previous meal selection.

If the temperature is above 125_F(52_C), the display alternately reads SLOT CLN MODE

CLN MODE

and NOT SAFE YET. The display reads SAFE TO CLN when the slot is 125_F(52_C).

To exit clean mode

1. Press the MENU K E Y to display CLN MODE.

2. Press the ENTER KEY to exit the clean mode and return to normal operation. The slot alternately displays SLOT TEMP LOW and the prod uct selection until the temperature is within the normal operating limits.

NOTE: If the enter key is not pressed within 5

seconds the slot returns to the clean mode.

Press menu key to scroll to clean mode message

Press enter key to start clean mode

SAFE TO CLN

CLN MODE

To exit clean mode press menu key to display clean mode message

EXIT CLN MODE

Press enter key to return to normal display mode

FIGURE 5

2 --- 5

SLOT ON/OFF

OPERATION

To turn slot off

1. Press the MENU KEY to scroll to the slot off message, TURN SLOT OFF .

2. Press the ENTER KEY to enter the selection. The display reads SLOT IS OFF.

NOTE: If the enter key is not pressed within

five seconds the product selection returns to the operator mode.

TURN SLOT OFF

To turn slot on

1. Press the MENU KEY to scroll to the slot on message, TURN SLOT ON.

2. Press the ENTER KEY to enter the selection and return to the operator mode. The display alternately reads SLOT TEMP LOW and the product selection until the temperature is within normal operating limits.

NOTE: If the enter key is not pressed within

five seconds the slot returns to slot off status.

Press menu key to scroll to slot off message

Press enter key to turn slot off

SLOT IS OFF

Press menu key to scroll to slot on message

TURN SLOT ON

Press enter key to turn slot on and return to normal display mode

FIGURE 6

2 --- 6

UHC

DISPLAYING SLOT TEMPERATURE INFORMATION

1. Press the TEMPERATURE KEY to scroll the following temperature information for each slot:

Top plate actual temperature

Bottom plate actual temperature

TOP TEMP 155

BOT TEMP 155

Top plate setpoint temperature

Bottom plate setpoint temperature

2. The display automatically returns to operator mode if no key is pressed for five seconds.

Press temperature key to display top plate temperature

Press temperature key to display bottom plate temperature

Press temperature key to display top plate setpoint temperature

TOP TSET 155

Press temperature key to display bottom plate setpoint temperature

BOT TSET 155

Press temperature key to turn return to normal display mode

FIGURE 7

2 --- 7

OPERATING TIPS

OPERATION

Correct heat and moisture levels are important to the proper operation of the UHC. There are no doors in the cabinet. The trays act as doors, therefore it is important that they be positioned correctly. The trays must be inserted to the stop line. The stop line is clearly marked on the handle of all three tray styles.

Product Slots

The UHC has four slots that can hold up to three trays of product per slot.

Slot 1

Slot 2

Slot 3

Baked Products

Thefullsizetrayisdesignedtoholdallbakedproducts such as biscuits and muffins.

Use a UHC tray liner with the full size tray.

After biscuits have been removed from the biscuit oven, remove the wrapper and open the cardboard box. Slide the biscuits onto the tray liner.

Full size trays can hold up to 30 frozen biscuits, 20 scratch biscuits or 20 muffins.

Grilled Products

The 1/3 trayis designed to hold all grilled products.

Product should not be drained when picked up from the grill.

Use a UHC tray liner with the 1/3 tray.

Product should be stacked when placed in the lined 1/3 size tray. 10:1 and sausage patties can be stacked up to six high. Eggs (except scrambled), grilled chicken and 4:1 patties can bestackeduptothreehigh.

Product should be placed towards the center of the tray.

Slot 4

FIGURE 8

Fried Products

The 1/2 crumb tray with the wire rack is designed to hold all fried products.

Product should be held in the wire rack which is placed in the crumb tray.

UHC tray liners are not necessary when using thewirerackforfriedproduct.

FIGURE 9

Production control charts

Laminated charts can be ordered through O’Brien Budd, Inc. The ordering numbers are:

Breakfast UHC card #MCD 63102

Regular M enu UHC card # MDC 63102A

2 --- 8

UHC

SEQUENCE OF OPERATION

COMPONENT REFERENCE

NOTE: Refer to FIGURE 10 page 2 ---10 for compo-

nent locations.

1. METAL OXIDE VARISTOR

2. DPST POWER SWITCH

3. TANGENTIAL BLOWER

4. TRANSFORMER 200-240V

5. HEATER TRIAC

6. HEATER ELEMENTS

7. SHELF PROBES

8. SHELF 1 DRIVER BOARD

9. SHELF 2 DRIVER BOARD

10. SHELF 3 DRIVER BOARD

11. SHELF 4 DRIVER BOARD

12. SHELF 1 FRONT DISPLAY ASSY.

13. SHELF 2 FRONT DISPLAY ASSY.

14. SHELF 3 FRONT DISPLAY ASSY.

15. SHELF 4 FRONT DISPLAY ASSY.

16. SHELF 1 REAR DISPLAY ASSY.

17. SHELF 2 REAR DISPLAY ASSY.

18. SHELF 3 REAR DISPLAY ASSY.

19. SHELF 4 REAR DISPLAY ASSY.

20. SHELF 1 FRONT MEMBRANE

21. SHELF 2 FRONT MEMBRANE

22. SHELF 3 FRONT MEMBRANE

23. SHELF 4 FRONT MEMBRANE

24. SHELF 1 REAR MEMBRANE

25. SHELF 2 REAR MEMBRANE

26. SHELF 3 REAR MEMBRANE

27. SHELF 4 REAR MEMBRANE

28. CN-1 CONNECTOR

29. CN-2 CONNECTOR

OPERATION

1. Apply power to the unit. The input voltage is applied to t he DPST POWER SWITCH (2), the TANGENTIAL BLOWER (3) and the primary side of the 200-240V TRANSFORMER (4). The input power is also applied to pins 2, 5, 8, and 11 of CN-7 on the mother board and to one side of each HEATER ELEMENT (6) on WH-11.

2. 18VAC is applied to the mother board through the secondary side of the TRANSFORMER (4) between OR-20 a nd Y-20. 9VAC is applied to the mother board from the secondary of the TRANSFORMER (4) between BL-20 and OR-20 and between BL-20 and Y-20. The mother board applies 18VAC to each shelf driver board through the wire bundle at CN-1 (28) while continuously exchanging operational logic signals with each shelf driver board through the wire bundle attached to CN-2 (29). After the individual SHELF DRIVERS (8--- 11) receive power and communications from the mother board they send power and logic sig nals to its FRONT and REAR DISPLAY AS SEMBLIES (12--- 19) and their respective MEMBRANE SWITCH/DISPLAY DECALS (20--- 27).

3. The main control board uses the inputs from the eight individual RTD PROBES (7) to determine if any of the eight HEATERS (6) need to be energized to bring their respective shelf sections to the proper temperature.

NOTE: The eight probes react independently

and sense temperature by resistance. Refertothetableonpage6---3ofthe Technical Appendix.

4. If the main control decides that an individual shelf section is not at the correct temperature it energizes the proper TRIAC (5) and sends power t hrough CN-7 to the respective heater.

NOTE: If the main control senses that the tem-

perature of an individual shelf section is much lower than the setpoint it will pulse the voltage to the heater to maintain a consistent temperature with a minimum overrun.

5. When the main control determines that all individual shelf sections are within their programmed setpoints it maintains these temperatures with a continual pulsing of the input voltage to each shelf section independently.

NOTE: If the main control senses that a heater

is not performing to its programmed specifications it can display a variety of failure conditions. See page 4---1 of the Troubleshooting section.

2 --- 9

OPERATION

913

FIGURE 10

2 --- 1 0

UHC

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2 --- 1 1

CHAPTER 3

PROGRAMMING

AND CALIBRATION

UHC

STORE MANAGER PROGRAMMING

PRODUCT SELECTION FOR EACH SLOT

Program mode is used to select the products for each slot. All entries are made through PAGE and MENU selections. Each slot has a page of configuration menus. The top slot in the cabinet is Slot 1.

The PAGE key selects the slot (1-4) pages.

The MENU key selects the configuration menu items (meal and tray location).

The UP/DOWN arrow keys select the available products for each meal.

PROG MODE

To e n t er P rogram M o d e

1. Press and hold the MENU KEY for at least five seconds. The display reads PROG MODE .

To enter Page Selections

Each slot page (1-4) contains product selection for each meal.

1. Press the PAGE KEY to scroll to the slot (1-4) pages.

Press and hold menu key to enter program mode

Press page key to scroll slot page selections

SLOT 1

SLOT 2

SLOT 3

SLOT 4

FIGURE 1

Press page key to scroll slot page selections

3 --- 1

PROGRAMMING AND CALIBRATION

Meal Selection and Tray Position

1. Press the MENU KEY to scroll the meal and tray position in the left and center displays. The current product selection is indicated in the right display.

SLOT 1 PAGE

BFST LEFT SAUS