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 (802) 658-6600 www.marsalsons.com
P/N 72613 Rev A (1/18)
TABLE OF CONTENTS
I TESTING OF COMPONENTS
MAIN MANUAL CONTROL VALVE #70380 .............................................................. 3
THERMOSTAT FDTH #71880 ........................................................................... 3
II MAINTENANCE INSTRUCTIONS
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
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