MARSAL MB236 Installation & Operating Manual Download Page 7

VENTILATION

Local codes and conditions vary greatly from one area to another and must be complied with. The 

following  are  the  minimum  requirements  for  good  ventilation.  Please  remember  that  these  are 

general recommendations or guidelines and you may have a special condition or problem that will 

require the services of a ventilation engineer or specialist. 

Proper ventilation is the oven owner’s responsibility. Improper ventilation will inhibit 

oven performance, such as the pilot going out or the burning of the bottom of pies. 

Marsal & Sons, Inc. cannot assume responsibility for loss or damage suffered as a result 

of improper installation. 

WARNING: 

Failure to properly vent the oven can be hazardous to the health of the 

operator and may result in operational problems, unsatisfactory baking and possible 

damage to the equipment.
Damage sustained as a direct result of improper ventilation will not be covered by 
the Manufacturer’s warranty. 

CANOPY METHOD

The ideal method of venting a gas oven is through the use of a properly designed ventilation hood 

which extends 10” - 12” in front of the oven. The short stainless steel flue that is supplied with the 

oven must be installed. Place the flue over the collar that is located on the top of the oven and 

press down until it is firmly locked in place. The angle should face forward and always away from 

any filters. A strong exhaust fan will create a vacuum in the room. For an exhaust system to work 

properly, replacement air must be introduced into the room.

The hood should be sized to completely cover the equipment plus an overhang of at least 6” 

(15 cm) on all sides not adjacent to a wall. The distance from the floor to the lower edge of 

the hood should not exceed 7’ (2.1 m). 

The capacity of the hood should be sized appropriately with provisions for an adequate 

supply of make up air. 

DIRECT CONNECTION METHOD

An unrestricted vent pipe that provides exit air at the oven of a minimum of 55 CFM per oven must 

be provided for the vent pipe at the top of the oven. The vent pipe should be a minimum of 6” in 

diameter. 

A draft diverter (or draft hood) must be installed for a direct vent connection system 

in order to work properly. No more than two 90° elbows should ever be used in a direct vent 
connection. 

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Summary of Contents for MB236

Page 1: ...CE IS EQUIPPEDWITH ATHREE PRONG GROUNDING PLUG FORYOUR PROTECTION AGAINST SHOCK HAZARD AND SHOULD BE PLUGGED DIRECTLY INTO A PROPERLY GROUNDED THREE PRONG RECEPTACLE DO NOT CUT OR REMOVE THE GROUNDING PRONG FROM THIS PLUG KEEP THE OVEN AREA FREE AND CLEAR FROM COMBUSTIBLE AND NONCOMBUSTIBLE CONSTRUCTION DO NOT OBSTRUCT THE FLOW OF COMBUSTION AND VENTILATION AIR THIS OVEN HAS ZERO CLEARANCE ON BOTH...

Page 2: ...ATIONS 2 DELIVERY 3 OVEN LOCATION 3 ADJUSTMENTS ASSOCIATED WITH INITIAL INSTALLATION 3 ASSEMBLY INSTRUCTIONS 4 VENTILATION CANOPY METHOD 5 VENTILATION DIRECT CONNECTION METHOD 5 VENTILATION PROBLEMS 7 INSTALLATION OF BAKING CHAMBER BRICKS 7 CURING THE OVEN DECK 9 II OPERATING MANUAL STARTING THE OVEN 10 OVEN CONTROL 10 MAINTENANCE 11 CLEANING THE OVEN 11 ...

Page 3: ...n ELECTRICAL CONNECTION A 15 AMP service must be provided for each oven For 115 Volt usage a cord and plug is provided but connection to the electrical service must comply with local codes or in the absence of local codes with the National Electrical Code ANSI NFPA No 70 or latest edition GAS CONNECTION A NPT inlet is located at the rear of the oven Undersized gas supply lines will restrict gas su...

Page 4: ... no strain is placed upon the flexible connector With the restraint fully stretched the connector should be easy to install and quick connect 1 Mount the supplied bracket to the hold located on the rear or base frame on the same side as the gas supply The connector must comply with the Standard Connectors for Movable Gas Appliances ANSI Z21 59 or Connectors For Moveable Gas Appliances CAN CHA 6 16...

Page 5: ...Pilot outages or yellow floating flames on the main burners are indicative of a lack of secondary air Before making any utility connections to this oven check the rating plate to be sure the oven specifications are compatible with the gas and electrical services supplied for the oven The rating plate is located on the inside of the control door ADJUSTMENTS ASSOCIATED WITH INITIAL INSTALLATION Each...

Page 6: ...lts through the back of the base and the back of the body 5 For stackable units place the top oven on the bottom oven and align their front and sides The weight of the unit will keep it in place 6 Connect a gas line to the back of each oven and follow all local gas codes in connecting to the gas supply 7 Plug in the electric plug for the light to an electric power supply For MB Ovens Only 8 Connec...

Page 7: ...erly designed ventilation hood which extends 10 12 in front of the oven The short stainless steel flue that is supplied with the oven must be installed Place the flue over the collar that is located on the top of the oven and press down until it is firmly locked in place The angle should face forward and always away from any filters A strong exhaust fan will create a vacuum in the room For an exha...

Page 8: ...be capped with a UL Listed type vent cap to isolate the unit from external environmental conditions The direct vent cannot replace air consumed and vented by the oven Provisions must be made to supply the room with sufficient make up air Total make up air requirements for each oven section should be approximately 30 CFM per section To increase the supply air entering the room a ventilation expert ...

Page 9: ... must be placed on the right side of the deck oven as shown below MB 60 SD 660 SD 1060 Place the 5 12 x 36 bricks on the sheet metal of the oven deck as shown below FRONT OF OVEN 12 12 12 6 FRONT OF OVEN 12 12 12 12 12 VENTING PROBLEMS Iftheventingofanydeckoveniseitherrestrictedorforcedinanywaythebakingcharacteristics of the oven will be adversely affected Examples of restricted venting include us...

Page 10: ...e the 3 12 x 24 bricks on the sheet metal of the oven deck as shown below SD 248 Place the 4 12 x 24 bricks on the sheet metal of the oven deck as shown below SD 260 Place the 5 12 x 24 bricks on the sheet metal of the oven deck as shown below FRONT OF OVEN 12 12 12 12 12 FRONT OF OVEN 12 12 12 12 FRONT OF OVEN 12 12 12 FRONT OF OVEN 12 12 12 12 8 ...

Page 11: ...rt tracks CURING THE OVEN DECK 1 Sweep off all the debris from the brick deck surface 2 Cure the oven deck slowly by preheating the stones with the pilot burner on for 1 hour Then gradually increase the temperature 100 F per hour from 300 600 F is reached NOTE WHEN LIGHTING THE OVEN FOR THE FIRST TIME AS THE TEMPERATURE INCREASES SMOKE WILL OCCUR FROM THE OVEN BE SURE TO LEAVE THE DOORS CLOSED VEN...

Page 12: ...l Setting the bypass and calibrations and other adjustments are not covered under warranty and are the responsibility of the owner or the dealer who sold or installed the appliance If the oven is supplied on casters and is connected to the supply piping by means of a connector for movable appliances be aware that a restraint must be on the appliance and if disconnection of the restraint is necessa...

Page 13: ...Apply cleaners when the oven is cold and always rub with the grain of the metal Clean the aluminized interior portion of the oven with a mild detergent DO NOT use caustic solutions such as ammonia lye or soda ash DO NOT use domestic oven cleaners Any of these products will damage the aluminum coating DAILY CLEANING Clean brick surfaces using a deck scraper and brush A wet towel draped over the bru...

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