Understand the installation requirements of domestic hot water plumbing systems
Quiz by Ricky Fleet
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26 questions
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- Q1A rigid pipework hot water system has a working pressure of 4bar. At what pressure should the pipework be tested for soundness?1bar for 60 minutes4bar for 30mins then 6bar for 15 minutes6bar for one hour1½ times the working pressure for 15 minutes30s
- Q2In a customer’s property, the CWSC supplies both the hot and cold water systems. The minimum size of this cistern is:100 litresEqual to 48 hour's worth of water230 litresTwice the size of the domestic hot water cylinder30s
- Q3Which of the following appliances is most likely to offer the customer low pressure at a hot water outlet?Indirect cylinderCombination boilerCombination unitDirect cylinder30s
- Q4If hard water is allowed to be heated above 65 degrees Celcius, what could be the consequence in the system?The pressure relief valve would openThe blending valve would fail to workThe efficiency could be affected by limescaleLegionella could grow30s
- Q5To overcome a dead leg for a hot water draw-off point, what course of action could be taken?Install a more powerful circulatorIncrease the temperature on the cylinder thermostatInstall secondary circulationIncrease the size of the hot water cylinder30s
- Q6What is used at a basin outlet to prevent contamination of the water system?AUK2 air gapAUK3 air gapAUK4 air gapAG air gap30s
- Q7What is the primary function of the open vent on a domestic hot water system?To balance the feed from the CWSCAllow hot water to be distributed at a controlled pressureSafety relief pipeTake up a hydraulic shunt30s
- Q8To prevent the risk of legionella forming in a dead leg it should beNo longer than 2.5 meters, as stated in BSEN806As short as possibleDisinfected annually under a PPM programAlways heated to above 50 degrees C30s
- Q9Identify one advantage of a stored hot water system in a domestic propertyIt is suitable for low water pressure areasIt is cheaper and easier to installIt does not require a secondary source of heatThere is a continual supply of hot water30s
- Q10What pipe is installed for expansion safety reasons on an open vented system?Closed safety ventHot distribution pipeCold feedOpen safety vent30s
- Q11Where should the hot water draw off be taken from an open vented cylinder?The top of the cylinderThe side of the cylinderThe bottom 1/3 of the cylinderUnderneath the cylinder30s
- Q12Part L of the Building Regulations state that insulation must be fitted to the pipework connecting a cylinder to a minimum measurement of?0.5m3m2m1m30s
- Q13When installing the pipework to secondary circulation, where should it be connected into the cylinder?The bottom half of the cylinderThe bottom 1/3 of the cylinderThe top of the cylinderThe top 1/3 of the cylinder30s
- Q14What is the layering of water within hot water cylinders called?SimplificationSanitationStratificationSterilization30s
- Q15We install hot pipework above cold pipework for a specific reason, what is this?To prevent galvanic corrosionTo prevent heat lossTo prevent heat gainTo prevent leaks30s