Central Heating Guide
C/H Controls Introduction
C/H Thermal Controls
C/H Valve Controls
C/H Function Controls
C/H System Replacement
C/H Controls Installation
Energy efficient home
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Central heating replacement & Upgrading system info
WET SYSTEMS
Many existing wet central heating systems are of obsolete design and are poorly controlled.
Poor design features that should be improved are:
gravity circulation to the hot water cylinder – stored water is slow to re-heat
no cylinder thermostat – excessive stored hot water temperatures
no room thermostat – excessive room temperatures
no boiler interlock – boiler keeps hot unnecessarily during programmed periods of heating and hot water.
Where possible always upgrade at least to the minimum set of controls.
Where it is not possible to convert to full pumping, the following system will provide many of the energy efficiency benefits:
cylinder thermostat
room thermostat (or programmable room thermostat)
standard programmer (or programmable room thermostat)
one two-port motorised valve fitted on the gravity flow to the hot water cylinder
TRVs on all radiators except in rooms with a room thermostat
boiler interlock
WARM AIR SYSTEMS
The main benefits of improved controls for warm
air systems are gained when the air heater is
replaced. Most modern air heaters include controls
that vary the firing rate as well as controlling the
air fan speed, which reduces noise and provides a
more even temperature.
ELECTRIC STORAGE HEATING SYSTEMS
The options for upgrading the controls used with
existing electric storage heating systems are
limited, because the improved controls are usually
integral to the appliances or designed specifically
for use in modern appliances. However, an external
temperature sensor can be fitted that adjusts the
charge taken in accordance with external
temperature.
It is not practical to update controls used with
older-type storage heaters. Replacement of the
system with the integrated CELECT-type system
(see page 9) can be considered. Significant running
cost benefits are possible using modern storage
heaters, which have improved integral controls
such as automatic charge control and/or
fan/damper controls.
Pic: Upgraded system retaining gravity domestic hot water
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