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MARSAL MB236, Service Manual, Page: 9 / 9

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MARSAL MB236 Service Manual Download Page 9

8

 

 

OVEN

 

BURNER

 

WILL

 

NOT

 

THROTTLE

 

DOWN

 

OR

 

GETS

 

TOO

 

HOT

 

1.

 

Broken capillary tube on thermostat. 

2.

 

Oven thermostat out of calibration. 

3.

 

Minimum bypass flame too high (lower to 1/8”) 

4.

 

Dirt under thermostat valve seat. 

5.

 

Thermostat defective. 

TOO

 

MUCH

 

BOTTOM

 

HEAT

 

1.

 

Underdrafting or overdrafting (pulling heat out of the 

oven). 

2.

 

Temperature too low. 

3.

 

Improper calibration or gas pressure. 

NOT

 

ENOUGH

 

TOP

 

HEAT

 

1.

 

Overdrafting (pulling heat out of the oven). 

2.

 

Oven temperature too low. 

OVEN

 

WILL

 

NOT

 

KEEP

 

UP

 

AT

 

BUSY

 

TIMES

 

OR

 

THERE

 

IS

 

UNEVEN

 

COOKING

 

1.

 

Gas pressure too low. 

2.

 

Insufficient gas volume due to too small gas supply lines. 

3.

 

Additional gas regulators installed. 

4.

 

Poor draft conditions. 

5.

 

Too much draft pulling heat out of the ovens. 

6.

 

Air from fans or register blowing at front of oven.  

SOOTING

 

IN

 

BAKING

 

OR

 

BURNER

 

CHAMBER

 

1.

 

Air shutter space is too small. There must be a 1/8” – 
3/16” space. 

2.

 

Air shutter is clogged with flour dust. Clean the air 
shutter opening with a knife or brush. 

 

 

 
 

 

 

©2016

 

Marsal

 

Pizza

 

Ovens.

  

175

 

E.

 

Hoffman

 

Ave.

 

Lindenhurst,

 

NY

 

11757

  

(631)

 

226

‐

6688

   

www.marsalsons.com

 

Summary of Contents for MB236

Page 1: ...k Ovens MB42 MB60 MB236 MB866 SD236 SD248 SD260 SD448 SD660 SD1048 SD1060 SD866 SD10866 WF42 WF60 RETAIN THIS MANUAL FOR FUTURE REFERENCE 2016 Marsal Pizza Ovens 175 E Hoffman Ave Lindenhurst NY 11757 631 226 6688 www marsalsons com ...

Page 2: ...e from pilot burner body 3 Clean orifice by blowing any foreign matter out the orifice hole Take care not to enlarge orifice hole 4 Replace components in reverse order If the pilot burner still does not operate or the main burner comes with a low flame or will not come at all replace the Automatic Safety Pilot Valve TSII MAIN MANUAL CONTROL VALVE 70380 The main manual control valve is a simple bal...

Page 3: ...ay be rectified by the adjustment of pilot burners main burners or thermostats It is therefore wise to attempt to correct operational difficulties through adjustment rather than the immediate replacement of parts PILOT BURNER ADJUSTMENT 70101 A commonly diagnosed malfunction of the safety pilot valve is the pilot burner flame sensing bulb relationship resulting from Improper draft Low gas pressure...

Page 4: ...hese flames will drop back to the port and lift again intermittently They are caused by too much primary air Decreasing the shutter opening will stop lifting flames o Floating flames are long and lazy in appearance poorly defined quiet flames which roll around the combustion chamber sometimes completely off the ports Floating flames result from too little secondary air Lack of secondary air is cau...

Page 5: ...he thermostat setting adjust the thermostat as follows A Pull thermostat dial straight off without turning B Hold calibration plate on thermostat and loosen the two calibration lock screws until the plate can be moved without moving the control C Turn calibration plate so that pyrometer reading is set in line with the indicator mark at the 12 o clock temperature variation will be 50 F 28 C between...

Page 6: ...pen combustion compartment door 2 Remove the burner door by removing its hinges 3 Remove the heat shields by removing the three screws that hold it together 4 Remove the screw that holds the pilot burner to the bracket 5 Remove the capillary bulb 6 Disconnect gas supply tubing from pilot burner 7 Replace pilot burner in reverse order from removal OVEN LIGHT BULB REMOVAL MB SERIES ONLY CAUTION Part...

Page 7: ... from removal AUTOMATIC SAFETY PILOT VALVE MAIN MANUAL CONTROL VALVE AND THERMOSTAT REMOVAL 1 Remove Control Stack Assembly see above 2 Remove respective control from Control Stack Assembly 3 Replace new control and other components in Control Stack Assembly in reverse order ATTENTION THE TSII SAFETY VALVE CAN BE REPLACED BY REPLACING THE HEAD ONLY LEAVING THE BODY STILL ATTACHED TO THE CONTROL ST...

Page 8: ...OT BURNER GOES OUT 1 Pilot thermocouple not in center of flame 2 Poor draft conditions snuff out flame no flue pipe 3 Too much draft pulls the flame away from thermocouple 4 Air from fans or register blowing at front of oven 5 Pilot flame too low 6 Pilot orifice is dirty 7 Thermocouple is defective 8 Safety pilot valve defective 9 Gas leak at pilot orifice fitting BURNER FAILS TO COME ON WHEN PILO...

Page 9: ...the oven 2 Oven temperature too low OVEN WILL NOT KEEP UP AT BUSY TIMES OR THERE IS UNEVEN COOKING 1 Gas pressure too low 2 Insufficient gas volume due to too small gas supply lines 3 Additional gas regulators installed 4 Poor draft conditions 5 Too much draft pulling heat out of the ovens 6 Air from fans or register blowing at front of oven SOOTING IN BAKING OR BURNER CHAMBER 1 Air shutter space ...

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