1) Which 3 devices make up 3-tier safety a) PRV b) Thermal cut-out c) Expansion Vessel d) TPRV e) Control Thermostat f) Boiler Thermostat 2) What is another name for the control thermostat on an Unvented Cylinder? a) Overheat Thermostat b) Timeclock c) Cylinder Thermostat d) Programmable Thermostat 3) What is the maximum temperature a control thermostat goes upto on an Unvented Cylinder? a) 60oC b) 80oC c) 95oC d) 65oC 4) What is another name for the 'Thermal Cut-out' on an Unvented Cylinder? a) Immersion Thermostat b) Over-heat Thermostat c) Boiler Thermostat d) Cylinder Thermostat 5) At what temperature will an Overheat Thermostat stop sending a live signal to the zone valve? a) 60-65oC b) 90-95oC c) 80-85oC d) 60-95oC 6) Hot water should be stored at a temperature not less than.......... a) 50oC b) 60oC c) 55oC d) 46oC 7) A hot pipe will be classed as an active dead leg if the water.......... a) reaches 50oC in 60 seconds b) reaches 55oC in 30 seconds c) doesn't reach 50oC in 30 seconds d) doesn't reach 55oC in 60 seconds 8) Which fitting prevents debris from entering downstream components? a) RPZ valve b) Pressure relief valve c) In-line strainer d) TPRV e) Tundish f) Pressure Reducing Valve 9) Water inside an unvented cylinder can reach 120oC without boiling a) True b) False 10) Pressure relief valves are sometimes also referred to as....... a) Expansion Relief Valves b) Pressure Reducing Valves c) TPRV's d) Safety Relief Valves

9189-05 3 Tier Safety

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