24 Minimiser SE - Installation35 INTERNAL WIRING2. Controls that override an on/off control, e.g. a frostthermostat, MUST be wired into the mains supply, inparallel, with the controls to be overridden. Refer toFrame 42.3. If a proprietary system is used, follow the instructionssupplied by the manufacturer.4. The pump must always be wired in parallel with the boiler.5. SYSTEM DESIGNS FEATURING CONTROLS OR WIRINGARRANGEMENTS WHICH ALLOW THE BOILER TO FIREWHEN THERE IS NO PUMPED CIRCULATION TAKINGPLACE MUST NOT BE FITTED.Advice on required modifications to wiring may be obtainedfrom the component manufacturers.36 EXTERNAL WIRINGINSTALLATIONExternal wiring MUST be in accordance with the current I.E.E.(BS.7671) Wiring Regulations.The wiring diagrams illustrated in Frames 38 to 41 cover thesystems most likely to be used with this appliance.For wiring external controls to the Minimiser boiler, referenceshould be made to the systems wiring diagram supplied bythe relevant manufacturer in conjunction with the wiringdiagrams shown in Frames 38 to 41.Difficulty in wiring should not arise, providing the followingdirections are observed:1. Controls that switch the system on and off, e.g. a timeswitch, MUST be wired in series, in the live mains lead tothe boiler.Flow wiring diagramLEGENDb - bluebk - blackbr - brownr - redo - orangew - whitey - yellowNote. If the programmer kit is to be fitted refer to the instructions provided with the kit, and Frame 36.Incoming mains wiring detailINSTALLATIONA pictorial wiring diagram is shown in Frame 37 .1. Route the mains cable into the bottom RHS rear of the casing.2. Swing the terminal strip bracket out.3. Wire the live and neutral into the terminal strip.4. Connect the earth wire to the earth post.Note. Ensure that the lengths of the current carrying conductors areshorter than the earth conductor so that if the cable slips in itsanchorage the current carrying conductors become taut before theearth conductor.5. Secure the mains lead with the cable clamp.6. Swing the terminal strip bracket back into its working position.