Honeywell ST9400A1002 1 Day, 2-Channel, 10 W, 24 V

Product Information

The unit has independent controls to Override the time switch setting (turn On when Off or Off when On) and also Boost to just give 1 - 3 hours extra On time. I set my Hot Water and Central Heating to come on for a couple of hours in the morning, and again in the late afternoon, the Hot Water goes off early evening, and the Central Heating turned off late in the evening. This feature enables homeowners to effectively manage their energy consumption, reducing wastage and optimizing efficiency. The Honeywell ST9400A Twin Channel Programmer unit is a 1 day full programmer with two on/off switching times per day (which can be increased to 3).

So when it started to play up (The pump would come on but the boiler wouldn't trigger) I decided the controller had gone wrong (despite a plumber telling me it was just air in the heating system). The Honeywell ST6400A Programmer can be used for combi boilers, heating zones or any application where small electric loads need switching.Think about how you use your domestic hot water – if you have a storage system, it is not necessary to have this switched on all the time, even when you are in the house. Took a bit of time to work out how to remove the previous model but this fits on to the same backplate.

They mention that it is easy to program and operate, changing the settings was delightfully easy, and that the controls are easy to read and set.Today a leading supplier to aerospace, automation, control and transportation industries throughout the world, Honeywell’s origins were in the area of heating controls, a market which they still dominate today. If the unit is a replacement for another controller which has a standard wiring backplate, then it can be replaced without the need to touch the wiring (Note: TURN OFF THE ELECTRICS TO THE UNIT BEFORE REPLACING) The unit can be programmed for up to 3 On-Off periods in a day (it comes set up for 2 periods). Choosing the right Honeywell Home Electronic Programmer 24 Hour ST9400A1002, is an important decision, and it's one we're sure to help you get right.