Star QT14 Operators Manual

A Star Manufacturing Company

10 SUNNEN DRIVE, ST. LOUIS, MO/U.S.A. 63143
PHONE [phone] FAX [phone]

HOLMAN CONVEYOR SANDWICH WARMER MANUAL

MODEL QT14

FOR SERVICE INFORMATION U. S. AND CANADA CALL:

TOLL FREE 1-800-807-9054

SUBJECT

TABLE OF CONTENTS PAGE

UNCRATING AND INSPECTION 1
ASSEMBLY AND INSTALLATION 1 & 2
OPERATION 3
BASIC CLEANING PROCEDURES 3 & 4
TROUGLESHOOTING 5 & 6
PREVENTATIVE MAINTENANCE & SCHEDULED CLEANING

DAILY CLEANING 7 & 8

•

• WEEKLY BELT CLEANING 9

• MONTHLY CLEANING 10 & 11

LONG TERM CLEANING 12

•

•

REPLACING HEATER TUBES 13 & 14

• REPLACING COOLING FANS 15

REPLACING BELT DRIVE MOTOR 16 & 17

•
WARRANTY PAGE 18

PARTS LIST AND HEATER TUBE LISTING 19 - 21
WIRING DIAGRAMS 22 - 24

Certain Models

Electric Cooking Equipment for the Food Service Industry

Conveyor Toasters & Ovens Cheese Melters Broilers Pretzel Bakers

2M-HG0500 Rev C 2/22/06

Common Questions, Myths, and Misconceptions

of Holman Conveyor Ovens

Misconception: High Voltage (208v typical) is always the same.
Reality: An oven designed for 208v should operate from 208-215v. This range is

typical of local power grids and daily fluctuations. Some municipalities
operate at 220 and 240v which would require design variations. Improper
voltage can result in reduced control, performance, and reliability. Voltage

Misconception: The under-carriage of your oven is a safe haven for paper wraps and utensils.
Reality: The high-speed fan is the lungs of your oven. The oven has under-clearance

Misconception: Vent hoods can be hard-wired into the oven or to the same wall circuit.
Reality: Your conveyor oven can not support the current draw of the oven and a hood.

Misconception: My conveyor oven is maintenance-free.
Reality: Proactive or preventive maintenance (PM) is the best way to protect against a

Misconception: My heater-tubes will last forever.
Reality: Your infra-red radiant style heating elements use a quartz sheath. They are

“It’s what you learn after you know it all that counts.” -John Wooden

mismatches or daily fluctuations can be monitored for corrective action.

to maximize fan performance, cooling, safety, and reliability. Please
maximize the air-circulation to your fan and clean the debris on fan-grill
often. Note: Beware of paper and plastic wraps being drawn into fan-grill.

This practice will decrease performance and reliability as well as jeopardize
the Underwriter Laboratory’s safety certification. Please have a qualified
electrician wire your vent hood to a separate circuit.

catastrophic failure (Murphy’s Law states: components will fail at peak
sandwich time). Maintenance provisions include heater-tubes, fan, chain,
belt, incoming power, lubrication, working and aesthetic surfaces, overall
cleanliness, and ventilation. Refer to weekly, monthly, and long-term
maintenance manuals for step-by-step instruction. Owning an emergency
repair kit is also recommended.

extremely effective and efficient in the bake, as well as producing quick rise­time from cold start to full bake. However, just like a light bulb, quartz is
brittle and can break from jarring or careless maintenance. Long term
degradation of quartz also occurs from air borne sugars, salts, and debris
settling on the sheath. For consistent performance replace your tubes at
prescribed intervals.

UNCRATING AND INSPECTION

Unpack unit and components from container. Remove all visible packing material, inspect
unit for damage. If damage is discovered, file a claim immediately with the carrier that
handled the shipment.

The following should be included in the container:

• 1ea. baking oven with heaters, and conveyor belt in place.
(NOTE): Remove heating element-shipping supports.

• 1ea. stainless steel unload tray, 1ea. stainless “Bake Aid” bracket

1ea. “Bake Aid” magnet label, 2ea. crumb trays & 4ea. metal legs.

ASSEMBLY AND INSTALLATION

1. Attach legs by screwing into weld nuts.

2. Anti Skid pads are available at no charge and may be adhered to the foot section of
each leg to prevent sliding. Call 1-800-807-9054 for details.

ADJUSTABLE LEGS SCREW
INTO BOTTOM OF UNIT

CAUTION: The National Sanitation Foundation does not approve use of these pads.

3. Install unit in its operating position. The load & unload ends must be at least 6" from
any vertical combustible surfaces. Allow sufficient space for operating personnel.
Have an electrician connect input power to the unit in accordance with local electrical
codes.

WARNING:

INSTALLING/REMOVING ANY PARTS.

WARNING:

LOCAL POWER COMPANY TO DETERMINE ACTUAL VOLTAGE AT JOB SITE.

WARNING:

PROPERLY WIRED. NEVER CONNECT UNIT TO POWER WITHOUT PROPER
GROUND CONNECTIONS. IMPROPER GROUND MAY RESULT IN SEVERE INJURY
OR FATALITY.

4. Before applying input power to the unit check heating elements for breakage. Do not

apply power to the unit if a broken tube is found. If no broken tubes are found apply
input power by switching the master On/Off toggle to the ON position. Turn conveyor
belt speed control to the maximum setting and check all heater tubes and conveyor for
proper operation.

MAKE SURE ALL INPUT POWER IS OFF BEFORE
BEFORE INSTALLING UNIT, HAVE YOUR ELECTRICIAN CHECK WITH
BE ABSOLUTELY SURE THE GROUND (EARTH) CONNECTION IS

IF FURTHER ASSISTANCE IS REQUIRED:
CONTACT STAR/HOLMAN FACTORY SERVICE TEAM AT 1-800-807-9054

1

5. Allow approximately 5 to 8 minutes for the twin-fan cooling system to come on. Check

the air intake fan area as noted below and be sure that there is a sufficient flow of air
into the control box.

Air intake areas are
located on each side
of the control panel.

6. If all heaters and conveyor system are operating properly, turn the master On/Off switch

to the OFF position and allow unit to cool. The fans will continue to circulate cool air
throughout the unit until the internal temperatures have been decreased.

7. If a problem is discovered during start up procedures, immediately turn the Master

On/Off switch to the OFF position and call the Holman Cooking Equipment Factory
Service Team at 1-800-807-9054.

8. The unload tray has a key-hole slot on the end of the tray that will slide over the two

screw heads on the end of the oven as shown below;

9. The crumb trays slide into each end of the warmer under the conveyor. A slot is formed

by two pieces of metal on each side of the area for the tray to slide into. The crumb
trays are important by keeping the interior of the machine clean and reflecting heat
away from the controls inside the bottom of the machine back up to the sandwiches. A
layer of aluminum foil on the tray (check that it will not interfere with the conveyor) will
make the tray more reflective and make cleanup quicker.

IF FURTHER ASSISTANCE IS REQUIRED:
CONTACT STAR/HOLMAN FACTORY SERVICE TEAM AT 1-800-807-9054

2

OPERATION

1. Turn Master On/Off switch to the ON position and variable speed control to fastest
time setting. Allow 1 hour for complete machine warm up.

2. Adjust speed control to desired speed.

3. Adjust speed as required during operation to achieve a good bake.

4. When done for the day, turn Master On/Off switch to the OFF position. The conveyor
will stop and the elements will go off. The two fans should continue to run. They are
controlled by a thermostat that will allow the fans to cool the machine. Do not begin
to service or clean the machine until the fans have stopped. CAUTION: Some parts
of the machine will still be warm.

Refer to the Troubleshooting section if the machine is not performing as expected.

BASIC CLEANING PROCEDURES

Preventive maintenance for your Holman oven consists of the following recommended
cleaning procedures. To keep your oven in its top operating condition, these steps should
be performed daily or weekly as indicated. Also refer to the Preventative Maintenance
section for more complete cleaning activities that should be performed on a less frequent
basis.

Turn power off and allow cooling fans to run until the control box is cooled off. The fans are
controlled by a thermostat in the control box.

DISCONNECT UNIT FROM POWER SUPPLY OR TURN POWER OFF AT WALL BREAKER. BE
SURE THE SANDWICH WARMER IS COMPLETELY COOLED BEFORE PERFORMING ANY OF THE
FOLLOWING PROCEDURES.

1. Remove Unload Tray (daily) as shown and wash with hot, soapy water.

IF FURTHER ASSISTANCE IS REQUIRED:
CONTACT STAR/HOLMAN FACTORY SERVICE TEAM AT 1-800-807-9054

3

2. Remove the Crumb Trays from both sides of the oven (daily) as shown below

(DO NOT CLEAN WITH CAUSTIC CLEANERS)

.

3. For lightly soiled conveyor surfaces a damp cloth or scotch pad can be used without
removing the conveyor belt. (daily) For heavily soiled conveyor surfaces refer to the
Preventative Maintenance section for more detailed instruction to remove the
conveyor belt. The belt will need removed for more thorough cleaning.

4. Check air intake area for dust and grease. To clean, vacuum and wipe with a dry
cloth. (daily) Do not spray cleaning fluids into the air intake. This may result in
component failure.

5. Carefully remove and clean the Neo-ceram window. (daily) Remove the
thumbscrews securing the window ring. Remove the window ring, the glass retainer,
and the piece of glass. Wash with hot, soapy water.

WARNING:

THE GLASS THAT IS SUPPLIED WITH THIS OVEN IS SPECIFICALLY

DESIGNED FOR IT. DO NOT SUBSTITUTE ANY OTHER GLASS PRODUCTS IN ITS
PLACE. NEVER OPERATE THE OVEN WITHOUT THE GLASS. NEVER ATTEMPT TO
TOUCH OR REMOVE THE GLASS WHILE THE OVEN IS HOT. ALLOW THE OVEN TO
COOL FOR SEVERAL HOURS BEFORE STARTING THE CLEANING PROCEDURE.

6. Re-assemble unit and check to be sure it is operating properly. If assistance is
required contact the Star/Holman Factory Service Team at 1-800-807-9054 (24
hours/day 7days a week).

IF FURTHER ASSISTANCE IS REQUIRED:
CONTACT STAR/HOLMAN FACTORY SERVICE TEAM AT 1-800-807-9054

4

eat

TROUBLESHOOTING GUIDE

# UNIT WILL NOT HEAT, CONVEYOR BELT WILL NOT TURN.

o Be sure main circuit breaker is switched to the ON position.
o Check that the unit is connected to power and Master On/Off switch is ON.
o Be sure HEAT LIMIT SWITCH is pushed in (see below).

Crumb Tray Slots

# UNIT WILL NOT HEAT, CONVEYOR TURNS.

o Check to see if the Master On/Off Switch is in the ON position.
o Press heat limit switch, located beneath the unload tray as shown above

H

Limit Switch

Your Holman Conveyor Oven is equipped with an automatically activated HEAT
LIMIT SWITCH that interrupts the heater tube connections if the air temperature in
the control box exceeds 190°F (88°C). This limit switch can be reset manually by
pushing the button in the center of the switch that is located beneath the unload
tray.

THE HEAT LIMIT SWITCH CAN BE ACTIVATED IF THERE IS NOT A PROPER
AMOUNT OF AIR FLOW BEING GENERATED BY THE COOLING FANS. IF THIS
OCCURS:

• DISCONNECT UNIT FROM POWER SOURCE.

• Make sure the air intakes in the front of the unit are free of dust, grease or other

obstructions.

• Make sure the crumb trays (heat reflectors) are in place (see photos this page
and page 2) NEVER OPERATE UNIT WITHOUT CRUMB TRAYS IN POSITION
AS THIS CAUSES OVERHEATING IN THE CONTROL BOX AND WILL SHUT
DOWN THE MACHINE.

• If the outside of the air intakes is clear and the crumb trays are in place and the
unit continues to shut down because of the Heat Limit Switch, refer to the
cleaning instructions in the more complete Preventative Maintenance section.
A heavy buildup of dust and grease from the kitchen can cover parts inside the
control box area and cause overheating.

IF FURTHER ASSISTANCE IS REQUIRED:
CONTACT STAR/HOLMAN FACTORY SERVICE TEAM AT 1-800-807-9054

5

# CONVEYOR WILL NOT TURN, UNIT HEATS PROPERLY

o DISCONNECT UNIT FROM POWER SOURCE
o Check both fuses (replace if necessary)

Twin Fuse Block

o Check for obstructions that may have caused a conveyor jam. Utensils, foil or

large pieces of food could stall the motor. If there are no visible obstructions, try
turning the belt manually. If the belt turns, remove the power supply panel and
check for loose sprockets or chain. Realign any loose sprockets and re-tighten
the setscrews making sure the setscrews seat on the flats of the motor and drive
shafts.

Driven Sprocket

Drive Chain

Driver Sprocket

o If further assistance is required, contact the Star/Holman Factory Service

Team at 1-800-807-9054 (24 hours/day 7days a week).

# COOLING FANS DO NOT START (fans should start after the machine is warmed up)

o DISCONNECT UNIT FROM POWER SOURCE
o Remove panels with fan motors and check fan blades for obstructions/breakage.
o Check motor cords for secure connection
o Call the Star/Holman Factory Service Team, as the fan switches and/or fan

motor(s) may need to be replaced.

IF FURTHER ASSISTANCE IS REQUIRED:
CONTACT STAR/HOLMAN FACTORY SERVICE TEAM AT 1-800-807-9054

6

PREVENTIVE MAINTENANCE

DAILY CLEANING PROCEDURES

TO KEEP YOUR HOLMAN MODEL QT14 CONVEYOR SANDWICH WARMER AT PEAK
OPERATING EFFICIENCY, THE FOLLOWING INSTRUCTIONS ARE RECOMMENDED:

Turn power off and allow cooling fans to run until the control box is cooled off. The fans are
controlled by a thermostat in the control box.

DISCONNECT UNIT FROM POWER SUPPLY OR TURN POWER OFF AT WALL BREAKER. BE
SURE THE SANDWICH WARMER IS COMPLETELY COOLED BEFORE PERFORMING ANY OF THE
FOLLOWING PROCEDURES.

1. Remove the unload tray as shown below.
a. For lightly soiled tray, clean with a damp cloth.
b. For heavily soiled tray, use an abrasive pad and mild cleaner.

2. Remove crumb trays from beneath each end of conveyor belt and discard soiled aluminum foil.

If cleaning is necessary, use a wet cloth and mild detergent cleaner. Do not use a caustic
cleaner to clean the crumb tray.

3. Cover crumb tray with clean aluminum foil and return crumb tray to oven.

(NOTE: DO NOT RUN SANDWICH WARMER WITHOUT CRUMB TRAYS INSTALLED)

IF FURTHER ASSISTANCE IS REQUIRED:
CONTACT STAR/HOLMAN FACTORY SERVICE TEAM AT 1-800-807-9054

7