MARSAL MB236 Скачать руководство пользователя страница 4

3

 

 

MAIN

 

BURNER

 

ADJUSTMENTS

 

Satisfactory oven performance and burner life are dependent on correct burner adjustment. Before 
shipment, burners have been adjusted for proper operation with the type specified on the rating plate 
located inside the control compartment above the light switch. If further adjustment is necessary proceed 
as follows: 

 

Adjust primary air shutter at the front of the burner compartment to obtain a stable and quiet 
flame. 

 

If too much primary air is present, flames will lift from the burner parts. A reduction in 
primary air will correct this condition. 

 

Too little primary air will cause yellow tipping or an entire yellow flame to appear. This 
condition indicates incomplete combustion and may cause carbon sooting to appear on metal 
parts near the flame. 

 

When a flame raises off the burner it is important to determine if it is a “lifting flame” or a 
“floating flame”:  

o

 

“Lifting flames” rise from the ports to burn some distance above the ports. In some 
cases these 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 caused 
by incorrect venting, clogged flueways, blocked secondary air inlet openings, or lack 
of natural room makeup air to the oven.  

 

BYPASS

 

(MINIMUM

 

BURNER

 

FLAME)

 

ADJUSTMENTS

 

A Robertshaw FDTH 300° ‐ 650° F (149° ‐ 343° C) type thermostat is used. This is a throttling type gas 
thermostat with bypass flame adjustment control. For bypass adjustment proceed as follows: 

1.

 

Preheat oven to 500° F (260° C). When thermostat has throttled to bypass the glame on the 
main burner should have decreased to a flame no larger than 1/8” (6mm) 

2.

 

If flame is too high, remove dial, insert screwdriver in screw marked “B” on the thermostat and 
turn screw clockwise to lower flame.  

3.

 

If flame is too low, remove dial, insert screwdriver in screw marked “B” on the thermostat and 
turn screw counterclockwise to increase flame. 

 

 

Содержание MB236

Страница 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 ...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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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