4/6/25, 9:51 14 CFESA Gas Chapter 14- Gas Thermostats |
AM
14 CFESA GAS CHAPTER 14- GAS THERMOSTATS EXAM QUESTIONS AND
ANSWERS WITH COMPLETE SOLUTIONS VERIFIED
1.) How is a BJ thermostat mounted into With the flanged bracket that screws into the gas manifold.
the equipment?
2.) 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 is positioned properly in the flange.
of?
3.) What is a bypass flame? 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
4.) What is the correct procedure for so. Slowly turn the temp down and the flame should start to modulate down.
adjusting a bypass flame on a BJ When it gets to the position where the flame remains the same when you
thermostat? 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 temp when the
burner
5.) What is the exact procedure for
reaches the bypass flame. Pop the center out of the thermostat knob. If 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 temp.
6.) What does a throttling thermostat refer Refers to the fact that the flame reduces as the temp gets closer to the set point.
to?
7.) Where is the bypass adjustment On the front of the thermostat body.
located on a BJ thermostat?
8.) What will happen if a bypass flame is The equipment will overheat.
set too high?
9.) What are the primary functions of a To help maintain the temp and allow a smooth easy transition from full flame to
bypass flame? bypass flame, and back the other way.
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3
AM
14 CFESA GAS CHAPTER 14- GAS THERMOSTATS EXAM QUESTIONS AND
ANSWERS WITH COMPLETE SOLUTIONS VERIFIED
1.) How is a BJ thermostat mounted into With the flanged bracket that screws into the gas manifold.
the equipment?
2.) 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 is positioned properly in the flange.
of?
3.) What is a bypass flame? 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
4.) What is the correct procedure for so. Slowly turn the temp down and the flame should start to modulate down.
adjusting a bypass flame on a BJ When it gets to the position where the flame remains the same when you
thermostat? 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 temp when the
burner
5.) What is the exact procedure for
reaches the bypass flame. Pop the center out of the thermostat knob. If 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 temp.
6.) What does a throttling thermostat refer Refers to the fact that the flame reduces as the temp gets closer to the set point.
to?
7.) Where is the bypass adjustment On the front of the thermostat body.
located on a BJ thermostat?
8.) What will happen if a bypass flame is The equipment will overheat.
set too high?
9.) What are the primary functions of a To help maintain the temp and allow a smooth easy transition from full flame to
bypass flame? bypass flame, and back the other way.
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3
