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horstmann-boiler-plus.jpg The Horstmann range of products offers a solution for both combi and non-combi boiler installations, meaning you can continue to fit Horstmann's ChannelPlus XL - Two Channel Programmers Offer up to three programmed Tiara, H525 and H527(Allowing for new programmer position). INSTALLATION AND Please refer to the User's Guide provided. RESETTING THE 13 Mar 2014Horstmann - Installation and User PDF,s. AS1 Series. -. -. AS1 - Installation. Click Here. 159 Kb. AS1 - User Guide. Click Here. 246 Kb. 425 Series. INSTALLATION INSTRUCTIONS. CORONET - DIADEM - TIARA. HORSTMANN. The 425 Range of traditional Electro-mechanical. Programmers offer a simple Horstmann H27 XL Series 2 Channel.Plus . Horstmann H21 H21XL H27Z H525 H527 H425 Tiara Diadem. Newlec NL425T NLH21 NLH27 NLE527 Free Boiler Manuals, Free Gas Manuals, Gas Documents, Templates, Horstmann Discontinued Manuals. 423 UM.pdf 424 UM.pdf 517 UM.pdf 525 UM.pdf 527 HORSTMANN 424 GEM. 2,3. 1,10. 6. 9. 4. HORSTMANN LEUCITE 423 & 424. 2. 1. 4. 8. 3. HORSTMANN 425 DIADEM. N. L. 3. 6. 1. HORSTMANN 525 & 527. I do not have the instructions. Where might I get them? Looking for instructions for boss therm digital centralheating programmer. Regards Page 1. Page 2. Page 3. Page 4. Page 5. Horstmann Controls Limited. Bristol. BS4 1UP.