Horstmann H27XL Programmer, Multi

Product Information

On Sunday morning I was looking forward to a lazy few hours in my PJs. The plan called for a hearty breakfast, freshly ground coffee, some light reading and a hot shower before deciding what to do for the reminder of the day. Regrettably, the unexpectedly cold water from the showerhead put an end to an otherwise agreeable time. c) allows power to PCB to produce and provide modified voltage to hold valve in mid position against the strength of the return spring.

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) If a Heating or Hot water period is not required it can be cancelled by setting the ON and OFF settings to the same time. Example ON 10:00am OFF 10:00am 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 also don't really understand how each of the two-way valves operate - whether the timer "job shares" between the two zones and whether two NEST thermostats can replace that functionality. Or if each thermostat demands heat and the timer is on for each zone, both valves just open and they get served with hot water equally.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. 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.

More manuals of Thermostats Frequently Asked Questions about Horstmann ChannelPlus H27XL Thermostat During power interruptions the display will be blank, after 3 days the current time of day will be lost. If the programmer is not to be used for a long period of time, the switch on the rear of the unit should be returned to the BATTERY OFF position. These are both to prolong the battery life. SERVICE AND REPAIR 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. Your programmer will prevent you from accidentally overlapping ON and OFF times. Example: If the 2nd ON time is set at 12:00pm and then you try and set the 1st OFF at 12:30 pm the OFF setting will 'bounce' by a 10 minute period until the 2nd ON time has been adjusted. FULLY PUMPED OR GRAVITY SYSTEMUsing the RESET procedure may rectify the fault. If the problem persists the programmer will need replacing. Turn the battery on. The switch on the rear of the unit must be in either the Fully Pumped or Gravity position. 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 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.