Controls Questions – Flashcards
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| Flame rectification devices are most commonly found on: |
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| Boilers[image] |
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| The term ASD is the term used for an: |
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| Atmospheric Sensing Device |
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| A device where a volatile liquid is heated to expand a bellows which in turn opens a valve to allow gas to flow is known as: |
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| Liquid expansion device |
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| An open flued gas appliance that is to be installed in a bedroom or other sleeping accommodation (where the appliance heat input is under 14kW) must incorporate: |
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| An ASD |
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| A thermo-electric flame failure system is a control consisting of: - |
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| A electromagnetic valve and thermocouple |
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| If unsure as to the nature of a fault, e.g. At Risk, ID, what document should be consulted? |
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| The Gas Industry Unsafe Situations Procedure[image] |
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| One of the following is not a gas safety device type. Which is it |
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| Flame Expansion |
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| What documentation should be filled in by the installer after completing the installation? |
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| Manufacturer?s log book/benchmark |
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| The maximum shut down time for a flame failure device on a hot plate is: - |
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| [image]90 seconds |
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| The safety shut-off lid on the cooker should be left closed when carrying out a gas tightness test. |
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| False[image] |
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| There are 4 main types of thermostat operation. Which of those below is not one of them |
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| heat conduction |
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| The type of SAFETY device used to extinguish the hob burners in the event that a cooker lid is lowered is known as |
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| a Safety Shut Off Valve[image] |
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| Which flame supervision devices senses the presence of the flame not the presence of heat: |
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| Rectification |
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| Where an open flue gas fire is to be fitted in a bedroom the following conditions apply |
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| The appliance is not rated over 12.7kW Net and has a vitiation sensing device fitted. |
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| What is the purpose of the bypass built into an oven thermostat |
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| To maintain a low flame at the burner when the thermostat temp is reached. |
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| How would you check a gas control tap? |
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| By operating and checking for smooth operation, high and low settings and flame picture |
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| What would be the effect should the flame fail when the oven thermostat says that the oven has reached temperature ? |
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| Gas would continue to enter the oven creating an immediately dangerous situation |
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| To assess the effectiveness of a thermo-electric FSD the operative should extinguish the flame: |
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| Time And listen for the click of the valve and verify the valve has closed with a blip test |
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| An appliance fitted with a zero governor may require: - |
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| The use of a flue gas analyser to commission the appliance |
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| What is a thermo-electric flame sensor |
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| thermocouple |
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| This device will initially only permit a small amount of gas to flow to the burner. This helps prevent the volume of gas in the oven building up to a dangerous level if the user is a little slow in getting it lit. Once the flame is established on the burner, the phial is heated and the LIQUID inside EXPANDS. This in turn expands a bellows (situated in the valve body), thus pushing open the gas valve to allow gas to flow at the correct rate (High Flame) |
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| Liquid Expansion Flame Supervision Device (FSD) |
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| How would you test an oven flame supervision device? |
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| By lighting and observing the flame, which must initially be low then go to high flame |
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| Before a new gas appliance can be left connected to the gas supply, it should be: - |
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| Fully commissioned |
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| What type of effects would suggest a faulty oven thermostat |
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| The burner flame never reduces to simmer or goes out completely |
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| A Thermally sensitive vitiation sensing device incorporates within it what 2 sensing controls |
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| ASD and Interrupted Thermocouple/Overheat Stat |
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| Name a common type of VSD (Vitiation Sensing Device) fitted on modern gas fires? |
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| Oxypilot (ODS) |
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| Which flame supervision device is generally the slowest acting: |
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| Bi-metallic |
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| Which is the most common type of flame supervision device fitted to a domestic cooker oven: |
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| Liquid/Vapour pressure |
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| Which capillary type liquid expansion control allows the increase or decrease of gas flow |
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| Oven Thermostat |
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| Which type of control has a capillary tube that goes from a sensor at the pilot/low flame of a boiler to the bellows that operate a gas control |
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| Liquid Expansion Flame Supervision Device |
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| Which type of liquid expansion control has a capillary tube that goes from the heat exchanger of a boiler to the bellows where it operates a micro switch |
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| Electric Thermostat |
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| What type of GAS CONTROL utilises a tapered brass plug to regulate the flow of gas to a burner: |
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| A Gas Control Tap |
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| What name is given to a thermocouple, (an item which is made of dissimilar metals which produces a current when heated) to operate a solenoid by creating an electro magnetic field |
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| A Thermo-Electric Flame failure Device |
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| [image] |
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| Thermoelectric Gas Valve |
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| What would be faulty if in an oven..The burner flame never reduces to simmer or goes out completely |
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| it would suggest a faulty oven thermostat. |
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| What am I describing..it maintains a low flame at the burner when the thermostat temp is reached. |
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| Thermostat Bypass |
