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WorksheetsCentral Heating L2
Total questions: 20
Worksheet time: 10mins
What is the Image shown
Still
Air Separator
Bypass valve
Slimline Boiler
What is Delta T
Weight of the cistern
The pump speed
Room temperature divided by boiler temperature
The difference between the temperature of the radiator and the room
What is this
Radiator spanner
Sonic screwdriver
Tap wrench
Pump adjustment key
Which radiator is a double panel double convector
Balancing a heating system requires you to adjust what
The thermostat
The TRV
The lock shield
The thermometer
Where is the neutral point
At the edge of the Klingon empire
Where the open vent connects to the circuit
Where the primary flow becomes the return
Where the cold feed connects to the circuit
The main problem with the one pipe system is that
They are prone to blockages
They can't be used in a bungalow
They are expensive to run
The earlier radiators pass cooler water back into the circuit
Wiring diagrams for the heating controls on a fully pumped system can be found in the
Manufacturer’s Instructions
British Standards
NICEIC standards
Wiring Regulations.
The cold water supply to a fully pumped open vented central heating system should be
isolated at the
stop valve to the incoming cold water supply pipework
Gate valve on the cold feed pipework from the F & E cistern
service valve to the float operated valve to the CWS cistern
service valve to the float operated valve to the F & E cistern.
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?
Back-boiler.
Condensing.
Combination.
Room-heater.
When positioning a single room thermostat, it’s recommended height from ground level is
1m
1.5m
2m
2.5m
When setting the water level in a feed and expansion cistern, the allowance that should be
made for the expansion of water in the heating system is
4 %
6 %
10 %
1600 times its volume
If TRVs or zone valves on a system close, the purpose of the automatic by-pass valve is to
make sure that
water can flow through the cylinder
air cannot enter the heating system
water cannot pump over the vent
water can flow through the boiler
The recommended test pressure for a hydraulic test on a central heating system is
normal working pressure
1.5 times normal working pressure
twice the normal working pressure
3 bar pressure
Before isolating a heating system for the day, in cold weather, in a flat owned by an elderly
person, a plumber should
get on with the work as fast as possible
ensure that an alternative means of heating is available
only carry out the work if two plumbers are available
refuse to carry out the job at all costs.
Gas Boilers should be installed by someone registered with
Gas Safe
HETAS
OFTEC
Ofsted
Oil Fired Boilers should be installed by someone registered with
Gas Safe
HETAS
Ofsted
OFTEC
Solid Fuel Boilers should be installed by someone registered with
Gas Safe
OFTEC
Ofsted
HETAS
What is the image shown used for?
Clearing the pump
Venting the boiler interlock
Charging the radiators
Bleeding the radiators
What is this
TRV
Bypass valve
Thermostatic mixing valve
High temperature relief valve
