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Central Heating

Exam revision materials for Plumbing Level 2&3 and ACS Gas Safety test

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Heat Emitters

Types

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Maintenance

Commissioning

Heating system water analysis

Servicing

Controls

Circulating Pump

Heating System Controls

Minimum Requirements

Room Thermostats

Regulations

Regulations

Heat Emitters

Heat Loss Calculation

Radiator Sizing

Types

Pipework

Fully Pumped Hot Water and Central Heating

Gravity Hot Water and Pumped Central Heating

Gravity System

Open-vented System

Pipework Sizing

Pipework Systems

Sealed Systems

System Layout

Underfloor Heating

Boilers

Boiler Sizing

Flue Types

Gas Boilers

Heat Pumps

Oil Fired Boilers

SEDBUK Rating

Solid Fuel Boilers

Convectors

Heat emmiter - convector type

  • Heat exchanger with fins surrounding heating pipes
  • Usually replace skirting boards
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Radiators

  • Cast Iron - traditional material for radiators
    Cast iron radiator
  • Pressed Still - material of most modern radiators
    panel_radiator
    • Panel radiators (single; with fins; double)
      • Height– 300-700mm
      • Width – 400-3000mm
      • 150mm – recommended distance from the floor
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Fan Convector Heaters

Fan convector heater

  • Used in "Reverse Return" central heating systems.
  • Requires low temperature to operate 40ºC
  • operate effectively on wet central heating systems whether driven by boilers or low temperature renewable technologies
  • up to 31% more efficient than an equivalent output radiator
  • it's less than half the weight than an equivalent traditional radiator
  • requires an electrical connection
  • Controls
    • low temperature cut-out thermostat, set at 35ºC (a fan will not operate until the temperature reaches 35ºC)

Fan Convector Heating System

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Radiator Controls

  • Connection size - ½" BSP
  • Air Release Valve - can be integral
  • Lock shield Valve - fitted to the return connection
    • used to balance the system
  • Customer Control Valve - fitted to the flow
    • Non-Thermostatic
    • Thermostatic Radiator Valve (TRV)
  • Methods:
    • a central heating calculator ('mears wheel')
    • manufacturer's heat emitters computer program ('Stars Myson heat loss calculator')
    • maths calculation
  • Heat loss:
    • due to air change and natural ventilation
    • through the building fabric
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