Understand mechanical central heating controls
Quiz by Ricky Fleet
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15 questions
Show answers
- Q1The boiler position can be higher than the hot water cylinder in aOne pipe gravity systemFully pumped sealed systemSystem with microbore heating with gravity primariesC plan system30sEditDelete
- Q2This symbol from BS 1192 indicates a central heating component. Where in a central heating system would this be found?Immediately after the circulator and before the zone valveOn a sealed system filling loopCold feed from the feed and expansion cisternThe primary flow to the hot water cylinder30sEditDelete
- Q3Which of the following components could be fitted with a remote sensor?A thermostatic radiator valveA diverter valveA kickboard convector heaterA two port zone valve30sEditDelete
- Q4Which one of the following components allows the customer independent control of the hot water and central heating system?Cylinder thermostatProgrammerRoom thermostatThree port mid position valve30sEditDelete
- Q5Which of the following assists in the removal of flux from central heating pipework?Setting the working temperature of the system to a maximum of 650CFlushing the system out prior to the handoverAdding an inhibitor to the system after commissioningSetting the circulator to maximum for 1 hour after soundness testing30sEditDelete
- Q6The steps to take prior to temporarily decommissioning a central heating system, so that an additional radiator can be installed, would includeSwitch off programmer so there is no call for heat, then drain downApply temporary continuity bonding to system, then drain downCheck for safe isolation of central heating system, then drain downBung F&E and apply temporary continuity bonding to flow and return pipework30sEditDelete
- Q7The customer complains that the downstairs radiators are cold and the upstairs radiators are only lukewarm. This is likely to be caused by a faultyThree port mid position valveBoilerRoom thermostatCirculator30sEditDelete
- Q8What would be the main effect on the central heating system if the circulator was installed in the position shown in this diagram?The system would be under negative pressureThe neutral position would be at the base of the open ventThe system would be pumping over the open ventThe system would be mostly under negative pressure30sEditDelete
- Q9What would be the main effect on the central heating system if the circulator was installed in the position shown in this diagram?This is the correct arrangement of the circulatorThe neutral position would be at the base of the open ventSystem under positive pressure and pumping over the open ventThe system would be under negative pressure and be pushing into the cistern30sEditDelete
- Q10What is the sequence to change a synchron motor?Disconnect cable, make a simple drawing of the wires, isolate the electrical supply, replace the motor and cable, reinstate and check for electrical safetyReinstate and check for electrical safety, disconnect cable, make a simple drawing of the wires, isolate the electrical supply, replace the motor and cableIsolate the electrical supply, make a simple drawing of the wires, disconnect cable, replace the motor and cable, reinstate and check for electrical safetyReplace the motor and cable, disconnect cable, reinstate and check for electrical safety, isolate the electrical supply, make a simple drawing of the wires30sEditDelete
- Q11What is the purpose of the mid position diverter valve?To fill the heating system via the feed and expansion cisternTo feed both the cylinder and heating circuits simultaneouslyTo divert the mid position sensorTo feed either the cylinder or heating circuit30sEditDelete
- Q12What is the purpose of the arrowed component?To heat the secondary water upTo control the flow of heated water to the heating circuitTo control the flow of heated water to the cylinderTo heat the primary water up30sEditDelete
- Q13Why is it important that the pump be fitted in the correct position?So that the water circulates in the right directionTo prevent cross contamination with the secondary waterTo prevent corrosion by aeration of the waterTo prevent leaks from the overflow pipe30sEditDelete
- Q14What is the correct position for the automatic bypass valve?ACB30sEditDelete
- Q15Where should the automatic bypass be fitted on a heating system?On the return from the heating to the return from the cylinder before the zone valveOn the flow after the pump before the zone valve and into the returnOn the flow pipe from the boiler to the cold feed pipe before the pumpOn the return pipe after the zone valve from the open safety vent on the flow30sEditDelete
