By Raymond Ward
This designated A-Z consultant to significant heating wiring structures offers a complete reference guide for hundreds of thousands of things of heating and keep an eye on gear, making it an necessary guide for electricians and installers around the nation. The publication offers finished assurance of wiring and technical standards, and now comprises elevated insurance of blend boilers, lately constructed keep an eye on positive aspects and SEDBUK (Seasonal potency of family Boilers within the united kingdom) boilers rankings, the place recognized. as well as supplying concise info of approximately 500 varied boilers fuelled by means of electrical, gasoline, oil and stable gas, and over four hundred programmers and time switches, this valuable source additionally beneficial properties a number 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 family significant heating structures and the data he has won from hands-on adventure and employees education is now introduced jointly during this finished instruction manual. Г‚В· a vital 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 resources 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.
9 As RWB 2, but without neon indicators 25 Domestic Central Heating Wiring Systems and Controls Landis & Staefa RWB 7 Electronic 24 hour, 5/2 day, 7 day time switch N L 1 2 3 4 ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ OFF ON N L MAINS SPARE COM On/off ϫ 2 H85 ϫ W140 ϫ D35 Switch rating 6A (2A) Voltage-free switching unless L–2 linked Landis & Staefa RWB 9 Electronic 24 hour, 5/2 day, 7 day Basic/Full programmer N L 1 2 3 4 ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ HW OFF CH OFF HW ON CH ON N L MAINS Landis & Gyr RWB 20 Electronic 7 day Basic/Full programmer N L 1 2 3 4 ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ CH OFF HW ON CH ON L HW MAINS OFF On/off ϫ 2 H85 ϫ W140 ϫ D35 Switch rating 6A (2A) To change from Full to Basic move dip switch on rear of programmer to ‘10’ position On/off ϫ 3 H87 ϫ W135 ϫ D40 Switch rating 6A (2A) For Full control cut link at rear of programmer The unit is battery powered so no neutral is required.
In locations as described above. Voltage-free switching unless L–4–1 linked 35 Domestic Central Heating Wiring Systems and Controls Randall 851 ᭺ 7 day time switch E N L 6 5 4 3 2 1 ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ SPARE MAINS SPARE OFF With 10A SPDT switch ON COM Voltage-free switching unless L–1 linked Randall 852 ᭺ 2 channel 7 day time switch E N L 6 5 4 3 2 1 ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ SPARE MAINS OFF ON COM OFF ON COM CHANNEL 2 CHANNEL 1 With independent SPDT switching to each channel Voltage-free switching unless L–4–1 linked Randall 911 Electronic 24 hour time switch E N L 1 2 3 4 5 6 ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ MAINS SPARE OFF COM ON On/off ϫ 6 H85 ϫ W160 ϫ D38 Switch rating 3A Voltage-free switching unless L–5 linked Randall 922 Electronic 24 hour Basic/Full programmer E N L 1 2 3 4 5 6 ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ ᭺ MAINS HW COM HW CH COM CH OFF ON OFF ON Voltage-free switching unless L–2–5 linked Facility for setting hot water and heating at different times from each other daily in Full mode.