A heating circuit in which the flow and return pipes are completely separated until they connect to the boiler is known as a
a) one pipe system
b) two pipe system
c) sealed system
d) gravity system.
A British Standard that includes detail on the requirements for installing open vented central heating systems in dwellings is
a) BS EN 12056
b) BS 6700
c) BS EN 12828
d) BS 5449.
Which pipe connects to port X in the diagram of an air separator below?
a) Open vent pipe.
b) Primary flow to system.
c) Primary flow from boiler.
d) Cold feed pipe.
What is the recommended actual capacity of the feed and expansion cistern in a small open vented indirect central heating system?
a) 6 litres
b) 18 litres
c) 52 litres
d) 100 litres.
What is the name of the component shown below?
a) Temperature relief valve.
b) Pressure relief valve.
c) Pressure regulating valve.
d) Thermostatic radiator valve.
Which one of the following gas boilers overcomes the need for a cold water storage cistern, feed and expansion cistern and hot water storage vessel?
a) Back-boiler.
b) Traditional.
c) Combination.
d) Room-heater.
What is the recommended maximum clip spacing distance for a vertical 15 mm copper pipe?
a) 1200 mm.
b) 1800 mm.
c) 2000 mm.
d) 2500 mm.
The Domestic Heating Compliance Guide supports which document?
a) British Standard 8000.
b) The Water Supply (Water Fittings) Regulations.
c) British Standard 5449.
d) Building Regulations Approved Document L1.
Minimum controls which must be provided when replacing a gravity fed cylinder supplied from a gas boiler, as laid down in the Domestic Heating Compliance Guide, is
a) a thermo-mechanical thermostat
b) no minimum control required
c) fully motorised two port valve
d) electronic thermostat.
What type of heat emitter is shown in the following photograph?
a)Hospital radiator.
b) Panel radiator.
c) Column radiator.
d) Skirting heater.
The drawing below shows the connection arrangements to a feed and expansion cistern, pump, open vent and cold feed pipe. What is the likely outcome of positioning the system in the left shown?
a) The cold feed pipe is at the point of highest positive pressure.
b) The system will be largely under negative pressure.
c) A neutral pressure will be maintained in all system pipework.
d) The system will pump over the open vent pipe.
The minimum size of the cold feed pipe to a fully pumped heating system in a domestic dwelling is
a) 15 mm
b) 22 mm
c) 28 mm
d) 35 mm.
A three-port mid-position valve can provide heated water to
a) only the heating circuit
b) only the hot water circuit
c) both the heating and hot water circuit, but not both together
d) both the heating or hot water circuit and both together.
What type of central heating control component is normally used in conjunction with a frost thermostat to conserve energy when exposed parts of a central heating system are required to be protected against frost damage?
a) Room thermostat
b) Pipe thermostat.
c) Automatic bypass valve.
d) Frost relief valve.
Water in a wet central heating system is normally treated with
a) sodium hypochlorite
b) corrosion inhibitor
c) caustic soda solution
d) disinfectant.
What type of central heating component is shown in the photograph below?
a) Programmer.
b) Timer.
c) Motorised valve.
d) Room thermostat.
The method by which panel radiators transmit most of their heat is
a) conduction
b) convection
c) radiation
d) condensation.
The water level in the feed and expansion cistern of a central heating system should be set to allow sufficient room for
a) thermal expansion of the water
b) coping with pumping over
c) air venting
d) reduction of noise when filling.
The normal position for a cylinder thermostat that is strapped to a cylinder is approximately
a) at the top of the cylinder
b) a third of the way down the cylinder from the top
c) half way down the cylinder
d) a third of the way up from the bottom of the cylinder.
The type of heating system that uses 2 x two port motorised valves is known as a
a) A thermostatic radiator valve.
b) A lockshield type valve.
c) A wheelhead type valve.
d) An electro mechanical valve.
Which component is used in a heating system fitted with a low water content boiler to ensure that a minimum water flow rate is maintained through the boiler heat exchanger at all times?
a) Automatic bypass valve.
c) Pressure reducing valve.
d) Lockshield gate valve.
A central heating control component which can regulate the on/off periods of two or more zones in a system is known as a
frost thermostat
room thermostat
thermo-mechanical valve
programmer.
Before you carry out a hydraulic pressure test on a new central heating system you should perform
a) a full disinfection of the system
b) a hot flush of the system and add corrosion inhibitor
c) a visual inspection of the system
d) a heat loss calculation of the system.
The following diagram shows the actions of which component in a heating system?
a) Boiler fan.
b) Circulating pump.
c) Shower pump.
d) Diverter valve.
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