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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Heating appliance thermostat controls
This section explains the range of temperature controls that are commonly available, what they
do and why they are important. Controls for wet, warm air and electric storage systems
are described. These controls are normally fitted away from the heating appliance,
although some controls are integral with the appliance, and they are described
further.
TIME SWITCH
Simple time control of a system that will only
switch one circuit. Most suitable for combis.
Should be chosen so that it is easy to understand
and use, especially when there is a change to the
householder’s domestic routine.
PROGRAMMER
A programmer can switch two circuits separately
(usually heating and hot water). There are three
basic types:
a mini-programmer allows space heating
and hot water to be on together, or hot water
alone, but not heating alone
a standard programmer uses the same time
settings for space heating and hot water
a full programmer allows the time settings
for space heating and hot water to be fully
independent.
ROOM THERMOSTAT
Simple room temperature control. Most room
thermostats include an accelerator (or anticipator),
which has the effect of smoothing out the
temperature cycle, so that on and off periods are
not too long. Wireless units are now available
that provide increased flexibility in positioning
and eliminate visible wiring.
PROGRAMMABLE ROOM THERMOSTAT
Allows different temperatures to be set for different
periods in the day or week. Provides a better match
to the householder living pattern. Important if
occupancy is varied over the day or week. Provides a
‘night setback feature’ where a minimum temperature
can be maintained at night. Many are battery operated
and can replace a conventional thermostat without
the need for additional cabling. Some also allow time
control of hot water.
FROST THERMOSTAT
Simple override control used to avoid frost damage
to the dwelling and/or boiler and system. A frost
air thermostat should be fitted in a suitable place
inside the dwelling so that a minimum
temperature is always maintained.
CYLINDER THERMOSTAT
Simple control of stored hot water temperature,
usually strapped to the side of the hot water
cylinder. It is commonly used with a motorised
valve to provide close control of water
temperature.
PIPE THERMOSTAT
Where the boiler is fitted in an unheated area, for
example a garage, a pipe thermostat should also
be fitted (to the exposed pipework). This pipe
thermostat is in addition to a frost air thermostat
to prevent the boiler firing unnecessarily in cold
weather and wasting fuel.
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