By Raymond Ward
This targeted A-Z consultant to imperative heating wiring structures presents a accomplished reference handbook for countless numbers of things of heating and regulate apparatus, making it an critical instruction manual for electricians and installers around the state. The publication presents complete assurance of wiring and technical requirements, and now contains elevated insurance of mixture boilers, lately built keep watch over positive aspects and SEDBUK (Seasonal potency of household Boilers within the united kingdom) boilers rankings, the place identified. as well as offering concise information of approximately 500 varied boilers fuelled via electrical, fuel, oil and sturdy gas, and over four hundred programmers and time switches, this helpful source additionally positive aspects a variety of easy-to-understand wiring diagrams with notes on all definitive structures. short part descriptions are supplied, besides up-to-date touch and web site info for many significant brands. Ray Ward has spent over twenty years as a expert within the box of wiring household important heating platforms and the information he has received from hands-on adventure and employees education is now introduced jointly during this entire guide. Г‚В· a necessary reference resource for all electricians and heating engineers Г‚В· offers product details from over forty brands Г‚В· absolutely up to date to incorporate additional information on new applied sciences, blend boilers and potency scores
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Additional info for Domestic central heating wiring systems and controls
22 On/off ϫ 3 H84 ϫ W150 ϫ D29 Switch rating 5A (1A) For basic control remove blue link on back of programmer Electronic 7 day Basic/Full programmer 7 day version of C21 Programmers and time switches Horstmann C 121 Electronic 24 hour Basic/Full programmer As C21 except cannot programme hot water and central heating separately Horstmann C 127 Electronic 7 day Basic/Full programmer As C27 except cannot programme hot water and central heating separately Horstmann H 11 Electronic 24 hour time switch E N L 1 2 3 4 5 6 ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ E N MAINS L ON COM OFF SPARE On/off ϫ 3 H101 ϫ W163 ϫ D33 Switch rating 3A (1A) Voltage-free switching unless L–5 linked Horstmann H 17 Electronic 7 day time switch E N L 1 2 3 4 5 6 ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ E N MAINS L ON COM OFF SPARE On/off ϫ 3 H101 ϫ W163 ϫ D33 Switch rating 3A (1A) Voltage-free switching unless L–5 linked Horstmann H 21 Electronic 24 hour Basic/Full programmer E N L 1 2 3 4 5 6 ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ E N MAINS L HW ON COM HW OFF CH ON COM CH OFF Voltage-free switching unless L–2–5 linked On/off ϫ 3 H101 ϫ W163 ϫ D33 Switch rating 3A (1A) To change from Basic to Full move slider at rear of programmer Horstmann H 27 Electronic 7 day Basic/Full programmer E N L 1 2 3 4 5 6 ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ E N MAINS L HW ON COM HW OFF CH ON COM CH OFF Voltage-free switching unless L–2–5 linked Horstmann H 27 Z Facility for setting hot water and heating at different times from each other every day in Full mode.
Move slide switch three positions to the right and re-fit switch cover plate. For Basic mode move the slide switch to the extreme right and fit gravity cover plate and switch on power. E N L 1 2 3 4 5 6 ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ E N MAINS L HW ON COM HW OFF CH ON COM CH OFF Voltage-free switching unless L–2–5 linked Electronic 7 day Basic/Full programmer Facility for setting hot water and heating at different times from each other every day in Full mode. On/off ϫ 2 H101 ϫ W175 ϫ D45 Switch rating 3A (1A) Convert to Full/Basic mode as 525 Horstmann 525 Zone As 527 7D but outputs labelled Zone 1 and Zone 2 instead of HW and CH 21 Domestic Central Heating Wiring Systems and Controls Horstmann 581 Senior Electronic 24 hour time switch ROOM THERMOSTAT Typical wiring diagram High Set-back Resistor Low M N L 1 2 3 4 5 Mains Hot Water Output Supply [Model 582 only] 6 Designed for use by the elderly on systems utilizing combination boilers.
A connection block is provided for neutrals and earths Potterton EP 4001 Electronic 5/2 day time switch A B C D N L 1 2 3 4 5 ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ SPARE MAINS SP OFF SP ON COM On/off ϫ 3 H104 ϫ W160 ϫ D41 Switch rating 6A (2A) Voltage-free switching unless L–5 linked. A connection block is provided for neutrals and earths Potterton EP 4002 Electronic 5/2 day time switch 5/2 day version of EP 4000 MK2 with 3 on/offs per day Potterton EP 5001 Electronic 7 day time switch A B C D N L 1 2 3 4 5 ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ SPARE MAINS SP OFF SP ON COM Voltage-free switching unless L–5 linked.