li>Compatible with Horstmann ChannelPlus H27XL series: Ensures perfect integration with your existing heating system. The programmer, otherwise known as the timeclock, timer or clock is a device that enables you to control when the hot water and heating is switched on to maximise home comfort. Fortunately as I was no longer struggling with worn-out buttons and a dead internal battery, putting in the settings I wanted was much quicker than with the old device.

Just be aware that the contacts between the backplate and the programmer are very tight as supplied and it takes a forceful tug to get the unit off again once fitted (which is what stumped the builders! XL Series 2 Electronic Programmers 17 CHANNELPLUS H47XL CHANNELPLUS H37XL CHANNELPLUS H37VXL CHANNELPLUS H27ZXL CHANNELPLUS H27XL CHANNELPLUS H21XL CHANNELPLUS H17XL CHANNELPLUS H11XL Programmer with 7 day setting over four independent channels. li>Advance and override functions: Easily adjust your heating without affecting the programmed settings. The wireless CentaurPlus C17 ZW operates with the latest Horstmann HRT4-ZW wireless room thermostat and together, the two offer a highly efficient controls package ideally suited to combi boiler installations. Among the best known Horstmann products is the 425 range of electro-mechanical time clocks, with models including the Coronet time switch, and Tiara and Diadem twin channel programmers.

One thing to watch is if you turn off the mains electric switch on the wall, say over the summer, the controller's battery is used more keeping its time setting, and eventually shortens the life of the battery. You can set the times to within 10 minutes for the heating and or hot water, for three periods each day of the week.

Registered address: National Shower Spares Ltd, Units 16-17 Bamel Way, Gloucester Business Park, Brockworth, Gloucester, Gloucestershire, GL3 4BH. do I have to use all these terminals and if so how do I connect the respective ones to the cylinder stat and the room stat in the wiring centre. Our previous model with exactly the same programming procedure the heating setting was the key control. Every time there was a power cut, the battery no longer held the times I had set so I had to manually re-set them, a tedious process. Also useful are the Boost override buttons which allows y ou to bring on the heating and / or hot water for 1 or 2 hours at any time.The H27XL can be programmed with up to 3 on/off settings per day with a separate programme every day of the week. In addition to controlling a heating system, the timeswitch can be used for the timed control of a security lighting system due to its 3-amp contacts. The HORSTMANN (SECURE) CHANNELPLUS H27XL PROGRAMMER - Now Use 4210051 is a genuine, brand new Horstmann Controls product, covered by a Horstmann Controls manufacturer's guarantee. But after speaking to Horstmann because there was no wiring diagram in the box they informed I needed to use all the terminals.

We inherited an older one of the same model which I found very difficult to use: the buttons took a very long time to react, and every time there was a tiny power cut or surge the device would lose the programming which had taken me ages to enter. I’m not sure which controllers will be compatible with my system so any advice would be greatly appreciated. It is a very strong fit, so you need to apply a fair amount of leverage to get the old one off and need to press the new one on firmly until it has fully engaged. Established in 1854 as a manufacturer of clocks, today Horstmann are a leading manufacturer of heating and hot water controls based in Bristol.To replace it with the new programmer was simple as the existing backplate with the wiring simply plugs into the back of the new one. I imagine the battery is there to keep the timer settings in the event of the power cut, but once the battery is done, that's it - the H27XL is dead. The 4 channel programmer follows Horstmann Controls’ AS (or Advanced Simplicity) design parameters which features an easily read, bright blue back lit LCD display . Part of a range of electronic programmers that offer up to four independent channels and feature a large, easy to read display and simple menu-driven programming. due to a plumbing issue we now have to wire a second boiler alongside another in a reasonable size house.