The information contained in a job specification for a hot water installation should include
Detailed plans and drawings showing the layout and pipe sizes of the system
Which one of the following provides the legal requirements for the installation of hot water distribution pipework
Water regulations
In order to isolate the hot water supply from the hot water storage vessel to the taps, a service valve should be located on the
Cold feed
A plumber suspects an electrical fault on a supply to an immersion heater, the first action the plumber should take is to
Safely isolate the circuit
Which one of the following electrical devices is often fitted to a hot water storage vessel fed by a fully pumped heating system, to provide back up in the event of a boiler breakdown
Immersion heater
When installing a new hot water system in a domestic property, which type of system is likely to require the most pipe work and fittings
Double feed indirect system
The main reason for installing a secondary circulation supply, to hot water draw off taps is
To prevent the possibility of dead legs
A service valve should be fitted on the pipework for an instantaneous electric water heater
As close as possible to the water heater inlet
Purpose of a full way gate valve is to
Isolate the cold supply to the hot water storage cylinder
The purpose of a double check valve on a mains fed shower is to
Prevent backflow
The correct method of isolating a water jacketed tube heater from the cold water supple pipe is to use a
Fullway gate valve
The purpose of allowing standing time when carrying out hydraulic tests on hot water systems is to allow the
Plumber to check for water leaks
The most efficient way of isolating and draining the hot water supply to a bath tap is to turn off the service valve to the
Cold water distribution pipe and drain through the bath tap
A plumber needs to turn off the hot water supply to an office block canteen. Who is the most appropriate to advise first?
The occupants
A record of permanent decommissioning is required for
Work in industrial / commercial premises
A common cause of air locks in the supply from a cold water storage cistern to a hot water storage vessel is due to the
Horizontal distribution pipework rising from the cold water storage cistern
A magnesium rod may be placed in a domestic hot water storage cylinder to prevent
Corrosion
Most likely cause of discoloured water at hot water draw off taps in a double feed indirect hot water system is due to the
Pump being set too high and breaching the air lock on the inner heat exchanger
Maintenance schedules for hot water systems would be used
Following the disinfection of a hot water system in a factory
The minimum distance between the water level and the invert level of the warning pipe in a feed and expansion cistern is
25mm
When a hot water pillar tap is opened, water appears from beneath the hand wheel. This problem can be rectified by
Repacking the gland
The live connection to an immersion heater is connected using a wire coloured
Brown
Which one of the following electrical safety precautions should be observed, when removing a section of metal pipe in a hot water system
Apply temporary continuity bonding to the pipe