Horstmann H27XL Programmer, Multi

Product Information

The default factory settings are shown, however if you wish to change these proceed as instructed below. For instance, I *hope* the cabling to each thermostat allows for me to install the NEST power supply (supplies?) in the hot tank cupboard (where the timer currently lives) and power each thermostat (remotely) that way. c) allows power to PCB to produce and provide modified voltage to hold valve in mid position against the strength of the return spring. Should you encounter any problems, please refer to the Question and Answer section SPECIAL FEATURES

On the ChannelPlus display - Boost 1 is Hot water extension 1 or 2 hour and Boost 2 is Heating extension 1 or 2 hours ADVANCE FUNCTION Whilst the HOLIDAY FUNCTION is in operation the system will remain OFF, the display will show the number of nights remaining. The HOLIDAY setting is an instant function and cannot be set in advance. The HOLIDAY FUNCTION can be cancelled at any time by pressing any of the SELECT buttons. Normal programme functions will resume at the first ON period after the pre-set number of nights has expired. INFORMATION AND ADVICE Programming ON/OFF times So using the lever will not take the valve the full distance and not far enough to trigger micro switch to cut (c) and make (d) I can get a screwdriver between the wall box and the stand-off but there's no way they are going to separate without my breaking one of them.Of course if HW is selected and not satisfied, the boiler/pump will run, because the power is supplied through the cylinder stat and not the valves orange wire. The installer will have set the programmer to suit the installed system. If this is a Fully pumped system this will allow independent control of the Central heating and Hot water, however on a Gravity system the Central heating and Hot water are linked so that it is not possible to use the Central heating independently. This will allow only one common time setting for both Hot Water and Central Heating. BATTERY What I really want to do is to install a NEST in place of the two thermostats, and a single timer for the water but I don't yet understand what wiring my system employs and how I might convert that for NEST. The simple instructions below are designed to help with the programming of the unit. All the following instructions require the front flap to be lowered. Please replace the flap when normal operation is required. SETTING DAY AND TIME OF DAY

I can’t say whether this is deliberate obsolescence by design but it doesn’t look good. The battery is always going to run out at some point and it’s poor that it’s not user-replaceable, especially in this era of trying to reduce e-waste. All I can say for sure is that I won’t be buying any Horstmann products in the future. I am wondering if the stand-off comes away from the main unit. I can pull the main unit away from the stand-off enough to get a screwdriver into the gap but it's not coming away consistently - only where I exert pressure so much that the plastic deforms. The Secure Meters Horstmann CHANNELPLUS H27XL is a white 2 channel 7 day electronic digital programmer with independent timing of heating and hot water.. User friendly, it is designed for domestic use, providing advanced, easily programmed features.

A piece of plastic which may act as some sort of stand-off or interface - it's the piece that has the 2 screws in the top (not any more though). I suspect this is integral to the main unit - I only mention it because it is a separate moulding This indicates that you have reached an existing set time period, you will be unable to set a new ON/OFF time unless there is an alteration to the existing timed period By pulling outward and generally downward I can clearly see the single wall box because I am dragging that towards me too. It is not separating from the main unit or the stand-off. More manuals of Thermostats Frequently Asked Questions about Horstmann ChannelPlus H27XL Thermostat