Hot And Cold Water System (Understanding)

Front 1

What is the mains supply stop valve called? (found at the road side outside your property)

Back 1

Supply company stop valve

Front 2

What is a combination stop key?

Back 2

It is the key used to stop the mains water supply to the property (road side)

Front 3

What is the usual size of the water mains supply at the road side?

Back 3

100 mm

Front 4

What is the name of the mains supply pipe that comes to the property?

Back 4

Service pipe

Front 5

What is the valve (stops water) called that is attached to the service pipe on entry to the home? and what is it's function?

Back 5

Stop valve - and when used it stops the flow of water to the home to allow repair and maintenance to pipe work

Front 6

What pressure is the mains water feed from the road? High or low

Back 6

High (usually)

Front 7

Where/in what will you find the Supply Company Stop Valve?

Back 7

In a pipe guard

Front 8

Supply stop Valve - how do you turn off a metre controlled water supply?

Back 8

The metre will have an incorperated key to stop the water

Front 9

What problem can you have with a Stop-valve guard pipe? How would you clean it? How would you test the stop-valve?

Back 9

Stop-valve guard pipes tend to fill up with mud and grit, operating the valve becomes difficult. Once a year,
clean it out using an old tablespoon taped firmly to a long garden cane. Use a combination stop valve key to
ensure the valve operates correctly and smoothly

Front 10

In older properties or flat what can a Stop Valve do?

Back 10

It may control the water to more than one property via the rising mains pipe

Front 11

If a Stop Valve controls more than one property what must you do? and Why?

Back 11

You must notify the owners of the other property as you may be liable for damage to water systems/heating systems etc

Front 12

Where do you find Stop Valves for the home? (name 5)

Back 12

Under the sink/road side/cloakrooms/under trap doors/in basements

Front 13

What build up do you get in a Stop Valve? How do you clear it? What do you do if it leaks?

Back 13

lime will build up inside the valve - you need to shut off and open three times once a year if it starts to leak change the washer

Front 14

If there is only one Stop-valve at the road side (& no stop valve in the property)what would be advisable to do?

Back 14

Fit a Stop-valve in side the home for ease in an emergency

Front 15

Where do you find the Stop-valve in a multi-building? (name 3)

Back 15

On the ground floor - on the dwelling floor or in the flat

Front 16

How many types of water supply are there? (name 2)

Back 16

Indirect and direct supplies

Front 17

What does a DIRRECT WATER SUPPLY allow?

Back 17

It allows the cold water supply to the cold taps to be taken from the rising mains.....

Front 18

What is a CHECK VALVE and why is it fitted to the rising mains? (name 2)

Back 18

It stops the water returning to the rising mains of the property and reduces the risk of water contamination

Front 19

Dirrect water supply systems do not have a heating coil inside the """""?

Back 19

The hot water cylinder

Front 20

Which boiler (system) requires the hot water cylinder and sorage tank from the loft to be removed when fitted to the property?

Back 20

Combi boilers

Front 21

Some dirrect boilers have a safety valve fitted - Why?

Back 21

They work under mains pressure (the system is known to leak)

Front 22

What devices are modern boilers fitted with to comply with the water supply by-laws? (name 2)

Back 22

Anti-syphon and Back Flow devices

Front 23

What is the coil called inside a hot water tank? (name 2)

Back 23

Heat exchanger or Calorifier

Front 24

Combi boliers can be fitted when the water pressure is? - A-Adequate b-low c-high (there may be more than one correct answer)

Back 24

A and C

Front 25

Running a combi boil can produce what fault? Why?

Back 25

Leaks due to the high pressure

Front 26

A check valve must be fitted to a toilet system, why?

Back 26

To stop the return flow of the water and to reduce contamination to the water system

Front 27

Indirect water system - where do they get their cold water supply from?

Back 27

The cold water tank in the loft

Front 28

Indirect water supply - where is the only drinking water supply found in the property?

Back 28

At the kitchen

Front 29

If there was a leak in an INDIRECT WATER SUPPLY SYSTEM would it be a greater or lesser leak than a DIRRECT WATER SYSTEM? what was your reason for your choice?

Back 29

A dirrect water system works under higher pressure, so the water loss from a leak would be greater

Front 30

Pump boosted showers - what water system CAN they be used on?

Back 30

Indirrect water systems

Front 31

What problems will a direct water system have durring winter?

Back 31

Frosting of pipes and leaks due to iced/burst pipes

Front 32

Water regs have insisted on a kit to be fitted - where and for what reason?

Back 32

Kits are to be fitted to the water tank to prevent contamination and to make water drinkable

Front 33

Indirect system - the boiler feed out - on what pipe does the pump get fitted to? and what does it pump/feed to?

Back 33

Hot water feeds out of boiler, fit the pump to the flow (inward), this pumps to the heat exchange in the hot water tank and to the radiators

Front 34

What 2 two valves are on a radator? One valve has a main purpose, which one and what purpose?

Back 34

Handwheel valve and lockshield valve to control the temperature

Front 35

Old hot water systems - how does the hot water tank get it's hot water? explain the process

Back 35

The hot water cylinder is gavity fed from the water tank in the loft, the tank water is drawn down (from the bottom) to the boiler and then back (flow) to the hot water cylinder (top)

Front 36

Old direct hot water system - why are they inefficient and what usually goes wrong and why?

Back 36

Pipes clog with lime scale, you can not fit central heating as there is a dirrect feed to the hot water cylinder.

Front 37

Modern Direct hot water systems - what do they do?

Back 37

The boiler can heat water dirrect to the property and also operate central heating.

Front 38

combi - when you run a bath what problem do you have?

Back 38

If the tap is a long way from the boiler the flow will be slow - also you would get alot of cold water before hot water gets to the tap

Front 39

Indirect hot water system - how does it work?

Back 39

Cold water is gravity fed from the storage tank in the loft to the bottom of the cylinder, inside the cylinder is the heat exchange/calorifier connected to the boiler by a feed and return pipe for cooler water - the primary circuit

Front 40

Heating water with a primary circuit - what does it prevent build up of?

Back 40

Lime scale

Front 41

How is a primary circuit filled?

Back 41

It is filled by the header tank/expansion tank in the loft - the pump inline draws the water into the circuit (can be gravity fed)