Holman 318HX Series - User Manual

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Overview

Function Description
Usage Features
Maintenance Features

The device is a Holman Proveyor Multi-Purpose Oven, available in 314HX and 318HX series models. It is designed for commercial use in food service locations, intended for personnel trained and experienced in its operation.

Function Description

The Holman Proveyor Multi-Purpose Oven is a conveyor oven designed for baking various food products. Its primary function is to cook items by combining heat and belt speed, allowing for flexible cooking profiles. The oven features separate controls for top and bottom heat, as well as a variable speed control for the conveyor belt, enabling users to adjust settings to achieve the desired balance of heat and speed for different products.

The oven is equipped with heating elements that provide the necessary heat for cooking. A cooling system, including an air intake fan, is integrated to manage internal temperatures, particularly within the control box, and prevent overheating. The conveyor belt transports food items through the heated chamber, ensuring consistent cooking.

For safety, the oven includes a Hi-Limit Reset button, which is an automatic activated temperature limit switch. This switch interrupts the heater tube connections if the air temperature in the control box exceeds 190°F (88°C), preventing damage from excessive heat. The unit will not reset until the internal temperature has fallen below this threshold.

Usage Features

Before operating the oven, users must ensure that all heating element shipping supports are removed. The unit requires proper assembly, including attaching the four stainless steel legs and leveling the unit. It must be plugged into a standard outlet specified for its voltage and amp draw.

For initial setup, the load, unload, and crumb trays need to be installed as shown in the manual, ensuring at least 6 inches of space from any vertical combustible surfaces for proper ventilation. Adequate space around the oven is crucial for ventilation to prevent overheating and poor baking. The crumb tray must always be properly positioned during operation.

To begin operation, the master on/off switch should be turned to the ON position. Both the top and bottom heat controls (or front heat controls for 3-phase units) should be set to 500°F (260°C), and the conveyor speed control should be set to the fastest setting. An initial warm-up time of 10 to 15 minutes is required before loading any product to ensure the unit reaches its operating temperature for satisfactory cooking. When changing heat or belt speed settings, allow approximately 5 minutes for the oven to stabilize.

The oven is designed for continuous operation but should not be left unattended. It is recommended to disconnect power at the end of each day. To prevent carbonization of food particles and grease, the unit should not be left at high temperatures when not in use or during idle periods, as it only takes a few minutes to regain operating temperature.

For stacking multiple ovens, a stacking spacer with an external air duct is required to prevent overheating of the control box of the top oven. The spacer ensures proper airflow into the top unit's control box.

Maintenance Features

Regular cleaning and maintenance are essential to keep the Holman Proveyor Oven in top operating condition.

Daily Maintenance:

Turn off the main power switch and disconnect the unit from the power source, allowing it to cool.
Wipe exterior surfaces with a damp cloth and mild detergent. Avoid caustic cleaners.
Remove and clean the load and unload trays with mild detergent and warm water.
Remove and clean the crumb trays by sliding them out from under the conveyor belt. Wipe with a damp cloth and mild detergent, again avoiding caustic cleaners. Ensure crumb trays are reinstalled before operating the unit.
Reconnect power.

Weekly Maintenance:

Perform daily cleaning procedures.
Using a damp cloth, wipe clean the fan guard located on the control box cover under the unit.
Clean the conveyor belt: Reconnect power, turn the ON/OFF switch to ON, and set the conveyor to its fastest setting. With the conveyor running and crumb trays in place, use a wire grill brush or dry abrasive pad to clean the exposed surface of the belt. Continue until the entire belt is clean. After cleaning, wipe the conveyor with a damp cloth to remove loose particles. Turn the conveyor OFF. Remove and clean the crumb trays again. Do not run the conveyor oven without crumb trays installed.

Monthly Maintenance:

Turn off the main power switch and disconnect the unit from the power source, allowing it to cool.
Perform daily and weekly cleaning procedures.
Remove and clean the conveyor belt: Locate the Master Links on the conveyor belt (3 for 314 models, 4 for 318 models) and unhook them to remove the belt from the oven. Carefully roll the belt out, taking care not to damage the heater tubes. Clean the conveyor belt in a deep sink using caustic cleaners if heavily soiled, or soak overnight in hot soapy water.
While the belt is removed, clean the inside surfaces of the oven cavity with a mild cleaner and damp cloth, being careful NOT to clean the heater tubes, as this can cause damage.
Remove the conveyor support system by detaching the couplers from the mounting studs. Clean with warm water and an abrasive pad, then reinstall.
Reinstall the conveyor belt, ensuring the hooks on the sides face inward and the ends point away from the belt's direction to avoid catching internal components. Pull one end of the belt over the sprockets, aligning the links, and reattach the master links.
Examine the oven for proper installation and reinstall crumb trays if not already done.
Reconnect the oven to the power supply and check for proper operation.

Periodic Maintenance:

Cleaning Air Intake (Once a week): Disconnect power, place the unit on its backside, and use a vacuum cleaner or damp cloth to clean the air intake.
Lubricating Chain & Sprockets (Every 6 months): Disconnect power, remove side panels to expose the chain drive. Apply an extreme pressure, synthetic chain lubricant (temperature range up to 400°F) liberally onto the chain and sprockets. This grease is available separately as part no. 1P-Z8914. Replace side panels, reconnect power, and test the unit.

Troubleshooting and Repair: The manual provides guidance for common issues such as the unit not heating or the conveyor belt not moving. It also includes instructions for replacing heater tubes, fan motors, and belt drive motors. For any problems, users are advised to contact the Star Service Department. Removal and replacement of the power cord and plug will void the warranty.