Marsal and Sons SD236 Manuel de service

GAS OVEN SERVICE MANUAL

MODELS: MB42, MB60, MB236, MB260, MB866,

SD236, SD248, SD260, SD448, SD660, SD1048, SD1060, SD866, SD10866, WF42, WF60

©2018 Marsal 42 Allen Martin Drive, Essex Junction, VT 05452 [phone] www.marsalsons.com

P/N 72613 Rev A (1/18)

TABLE OF CONTENTS

I TESTING OF COMPONENTS

AUTOMATIC SAFETY PILOT VALVE TSII #55127 ....................................................... 3

MAIN MANUAL CONTROL VALVE #70380 .............................................................. 3

THERMOSTAT FDTH #71880 ........................................................................... 3

II MAINTENANCE INSTRUCTIONS

ADJUSTMENTS ......................................................................................... 4

PILOT BURNER ADJUSTMENT #70101 .............................................................. 4

MAIN BURNER ADJUSTMENTS ..................................................................... 4

BYPASS MINIMUM BURNER FLAME ADJUSTMENTS .............................................. 5

THERMOSTAT CALIBRATION ....................................................................... 5

PARTS REMOVAL & REPLACEMENT .................................................................... 6

MAIN BURNER REMOVAL .......................................................................... 6

PILOT BURNER REMOVAL: #70101 ................................................................. 6

OVEN LIGHT BULB REMOVAL MB SERIES ONLY................................................... 7

GAS CONTROL AND PIPING CONTROL STACK ASSEMBLY REMOVAL .............................. 7

AUTOMATIC SAFETY PILOT VALVE, MAIN MANUAL CONTROL VALVE,

AND THERMOSTAT REMOVAL ...................................................................... 7

PRESSURE REGULATOR REPLACEMENT #71881 N OR #71882 P ................................ 8

III TROUBLESHOOTING .......................................................................... 8

GAS DECK OVEN SERVICE MANUAL 2

TESTING OF COMPONENTS

AUTOMATIC SAFETY PILOT VALVE (TSII) #55127

Pilot gas is supplied from the main valve inlet through a drilled passageway to the pilot burner. Pushing
the red reset button temporarily allows gas to ow to the pilot burner for ignition of the pilot burner ame.
When the bulb heats up, the main valve opens to allow gas to ow to the main burner. The red reset button
is then released.

If the pilot burner ame fails and cannot be reactivated the following
test can be performed:

• Pilot burner adjustment: Refer to following page.

• Clean Pilot burner’s limiting orice as follows:

a. Disconnect gas tubing at the pilot burner body

b. Remove cup shaped orice from pilot burner body

c. Clean orice by blowing any foreign matter out the orice

hole. Take care not to enlarge orice hole.

d. Replace components in reverse order. If the pilot burner still

does not operate or the main burner comes with a low ame,
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 ball valve. Due to its sim­plicity, failures of this type of valve are practically non-existent. For
diculties associated with this control, it would be best to replace
the valve.

THERMOSTAT FDTH #71880

For any suspected thermostat problems the following procedures
should be reviewed in this manual:

• Thermostat adjustment

• Bypass (Minimum Burner Flame) adjustment.

Figure 1

• Thermostat calibration. Most thermostat failures will generally fall into one of the following three catego­ries:

1. If thermostat is in a runaway condition and will not shut o at set temperature, replace the thermostat.

2. If thermostat will not maintain calibration after adjustment, replace thermostat.

3. If thermostat bulb or capillary are cut, bent, or unnecessarily attened, replace thermostat. (This is NOT
covered under the warranty!)

3 GAS DECK OVEN SERVICE MANUAL