4/6/25, 9:51 CFESA GAS - CH14 Gas Thermostat |
AM
CFESA GAS - CH14 GAS THERMOSTAT EXAM QUESTION AND ANSWERS
WITH COMPLETE SOLUTIONS
How is a BJ thermostat mounted into With the flanged bracket that screws into the gas manifold
the equipment?
When mounting a BJ thermostat to a You must make sure that the quad ring used to seal the flange to the thermostat
flange, what must you be careful of? is positioned
What is a bypass flame? Is the smallest flame that will keep the burner totally lit
Turn the thermostat to approximately 300° and let the unit run for ten minutes or
What is the correct procedure for so. Slowly turn the temperature down and the flame should start to
adjusting a bypass flame on a BJ modulate down. When it gets to the position where the flame remains the same
thermostat? when you continue to turn it, that is the bypass flame. Using the bypass
adjustment screw adjust this flame to the smallest flame that will keep the
burner entirely lit.
Place a thermometer over the top of the sensor bulb for the thermostat. Check to
ensure the bypass flame is correctly set. Record the temperature when the
burner reaches the bypass flame. Pop the center out of the thermostat knob. If
What is the exact procedure for
the
recalibrating a BJ thermostat?
calibration is off, insert a screwdriver into the adjustment screw in the center
of the
thermostat. Press hard on the adjustment screw, holding it still, and turn the knob
until it reads the correct temperature.
What does a throttling thermostat refer refers to the fact that the flame reduces as the temperature gets closer to the set
to? point.
Where is the bypass adjustment located On the front of the thermostat body
on a BJ thermostat?
What will happen if a bypass flame is The equipment will overheat
set too high?
What are the primary functions of a To help maintain the temperature and allow a smooth easy transition from full
bypass flame? flame to bypass flame, and back the other way.
Before beginning to check the calibration The adjustment of the bypass flame
on any gas thermostat, what should you
check?
What is the major cause of BJ thermostat Attempting to adjust the thermostat without pushing in hard on the adjustment
failure? screw, causing the cogs to strip out.
What are the two primary reasons that BJ Oven doors that do not shut tight and overheat the tapered plug on the
thermostat start to leak gas around the thermostat and front panels that bow out when they get hot, pulling the knob
knob? out.
Robertshaw FD thermostats are Heavy duty equipment
usually found in what type of
equipment?
What is an FDH or FDTH thermostat used Pizza Ovens
for?
On what type of applications do you find Convection Ovens
FDO thermostats?
On what type of applications do you find Deck Ovens
FDTO thermostats?
How do you adjust the bypass flame on a The same procedure is setting a bypass for a BJ thermostat, and the bypass
FD series thermostat? adjustment screw marked "B" is on the front side of the thermostat.
Does the bypass flame ever go out on Yes, on an FDO or FDH thermostat. If the equipment has reached operating
and FD thermostat if the flame is properly temperature and the thermostat knob is turned down manually, eventually the
adjusted? Why or why not? bypass will go off to allow the equipment to cool down.
1/
2
AM
CFESA GAS - CH14 GAS THERMOSTAT EXAM QUESTION AND ANSWERS
WITH COMPLETE SOLUTIONS
How is a BJ thermostat mounted into With the flanged bracket that screws into the gas manifold
the equipment?
When mounting a BJ thermostat to a You must make sure that the quad ring used to seal the flange to the thermostat
flange, what must you be careful of? is positioned
What is a bypass flame? Is the smallest flame that will keep the burner totally lit
Turn the thermostat to approximately 300° and let the unit run for ten minutes or
What is the correct procedure for so. Slowly turn the temperature down and the flame should start to
adjusting a bypass flame on a BJ modulate down. When it gets to the position where the flame remains the same
thermostat? when you continue to turn it, that is the bypass flame. Using the bypass
adjustment screw adjust this flame to the smallest flame that will keep the
burner entirely lit.
Place a thermometer over the top of the sensor bulb for the thermostat. Check to
ensure the bypass flame is correctly set. Record the temperature when the
burner reaches the bypass flame. Pop the center out of the thermostat knob. If
What is the exact procedure for
the
recalibrating a BJ thermostat?
calibration is off, insert a screwdriver into the adjustment screw in the center
of the
thermostat. Press hard on the adjustment screw, holding it still, and turn the knob
until it reads the correct temperature.
What does a throttling thermostat refer refers to the fact that the flame reduces as the temperature gets closer to the set
to? point.
Where is the bypass adjustment located On the front of the thermostat body
on a BJ thermostat?
What will happen if a bypass flame is The equipment will overheat
set too high?
What are the primary functions of a To help maintain the temperature and allow a smooth easy transition from full
bypass flame? flame to bypass flame, and back the other way.
Before beginning to check the calibration The adjustment of the bypass flame
on any gas thermostat, what should you
check?
What is the major cause of BJ thermostat Attempting to adjust the thermostat without pushing in hard on the adjustment
failure? screw, causing the cogs to strip out.
What are the two primary reasons that BJ Oven doors that do not shut tight and overheat the tapered plug on the
thermostat start to leak gas around the thermostat and front panels that bow out when they get hot, pulling the knob
knob? out.
Robertshaw FD thermostats are Heavy duty equipment
usually found in what type of
equipment?
What is an FDH or FDTH thermostat used Pizza Ovens
for?
On what type of applications do you find Convection Ovens
FDO thermostats?
On what type of applications do you find Deck Ovens
FDTO thermostats?
How do you adjust the bypass flame on a The same procedure is setting a bypass for a BJ thermostat, and the bypass
FD series thermostat? adjustment screw marked "B" is on the front side of the thermostat.
Does the bypass flame ever go out on Yes, on an FDO or FDH thermostat. If the equipment has reached operating
and FD thermostat if the flame is properly temperature and the thermostat knob is turned down manually, eventually the
adjusted? Why or why not? bypass will go off to allow the equipment to cool down.
1/
2
