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DOMESTIC HEATING CONTROLS ARE EASY

PART 2 - TIMERS & PROGRAMMERS

Today’s inescapable need to improve energy efficiency in UK homes has brought installers many opportunities to

make extra earnings through the upgrading of heating and DHW controls. Often, however, misunderstandings and

technical ‘mystique’ surrounding some of these products inhibits installers from fitting the most appropriate energy

saving devices that can cut household heating bills, improve comfort levels and reduce carbon dioxide emissions

into the atmosphere.

This series aims to remove some of the doubts and show that domestic heating controls really are easy.

TIME CONTROLS

Running a domestic central heating/hot water system continuously is prohibitively expensive for most users. One

certain way of holding down a home’s heating bills is to switch the system off as often as possible. Of course, this

can be done only when room and domestic water heating are not needed.

Time controls on most domestic heating/hot water systems are among the first essentials for improving home

comfort and reducing running costs. They trigger the controls ‘chain of command’, sending automatically timed

On and Off instructions to other system components. Each user-set, timed switching programme helps maintain

desired comfort levels and prevents excessive fuel consumption by inhibiting unnecessary boiler firing.

Winter temperatures in the UK are rarely low enough to keep the heating on overnight, so we usually cut heating

costs and sleep better in a cooler room by using a time control to automatically switch off the system late evening

and on again early morning. Also, we use the same timer to set Off and On periods during the daytime for

additional benefit.

Fig.1 shows a simplified typical heating controls wiring sequence. The time control governs when the heating

system operates whilst the thermostats and valve auxiliary switch provide the electrical interlock that prevents the

boiler firing if there is no demand for heat.

TIME

CONTROL

THERMOSTATS

(ROOM OR

CYLINDER)

RELEVANT

MOTORISED

VALVES

BOILER

AND

PUMP

Motor opens valve(s),

activates auxiliary switch

to boiler/pump

Sends timed ON/OFF

signals to thermostat

If heat demand exists,

switches close and

pass signal to valve(s)

Boiler can fire only

when a demand for heat

exists

Fig.1

1 2 3 4 5 6

Sommario

Pagina 1 - TIME CONTROLS

DOMESTIC HEATING CONTROLS ARE EASYPART 2 - TIMERS & PROGRAMMERSToday’s inescapable need to improve energy efficiency in UK homes has brought insta

Pagina 2 - 1 2 3

TYPES OF TIME CONTROLSDomestic central heating time controls are essential components of the ‘Minimum Set’ recommendations in theGovernment’s new Good

Pagina 3

MINI-PROGRAMMERSA mini-programmer is simply a time switch with a slave Heating terminal (Fig. 3). It can control both Heating andHot Water simultaneou

Pagina 4 - INSTALLATION

INSTALLATIONInstalling most modern time controls involves fixing a wall plate, making simple connections from this to a wiringcentre and then attachin

Pagina 5 - PROGRAMMING

This was a design initiated by British Gas that sought to overcome the limitations of having just 6 terminals. It didnot become generally adopted but

Pagina 6 - ADDITIONAL HELP

Programming an electro-mechanical timer simply involves rotating a dial to set the time of day, positioning pointersor tappets at desired switching po

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