Heating Thermostat
Discussion
Hi,
I'm after upgrading our thermostat and hopefully that replacing the separate timer unit.
What do I need to know in regards to choosing a thermostat? I have 4 wires (inc. earth) going to the current thermostat.
If I get a 7 day timer thermostat can I then remove the old timer unit (as this would now be surplus?). How would I remove??
Anybody got a thermostat they are happy with? Not wanting to spend mega money but after something nice...
I'm after upgrading our thermostat and hopefully that replacing the separate timer unit.
What do I need to know in regards to choosing a thermostat? I have 4 wires (inc. earth) going to the current thermostat.
If I get a 7 day timer thermostat can I then remove the old timer unit (as this would now be surplus?). How would I remove??
Anybody got a thermostat they are happy with? Not wanting to spend mega money but after something nice...
I have a Honeywell CM927 wireless programmable stat. I've fitted plenty of different brands and this is by far the best.
Its easy to programme, plenty of features like holiday mode, frost protection, optimum start and a few others. It has a nice big display showing you all the info you need.
You can get a hard wired version, the CM907 I think, which will probably be cheaper.
If you get one of these you can do away with the programmer/time clock.
I'm guessing you have a combi, so have no need for the hot water to be timed?
If not, you will need to keep your existing programmer.
Its easy to programme, plenty of features like holiday mode, frost protection, optimum start and a few others. It has a nice big display showing you all the info you need.
You can get a hard wired version, the CM907 I think, which will probably be cheaper.
If you get one of these you can do away with the programmer/time clock.
I'm guessing you have a combi, so have no need for the hot water to be timed?
If not, you will need to keep your existing programmer.
No the Honeywell CMxxx does not control hot water, this is why the existing timer would need to remain.
You should be able to wire a programmable stat from an old stat.
The four wires will most likely be:
Common - Live in from the CH ON terminal on the old timer
Call for heat - Live out to the motorized valve or switch live terminal if it is a combi.
Neutral - Usually used for the anticipator on the stat.
Earth - Pretty obvious.
The Honeywell CMxxx is powered by batteries and requires a live in and out for the switching side of the stat, which you have on the old stat.
The neutral and earth will not be needed with the new stat.
If you do use the old common on the new stat, you will either need to wire up the CH ON wire to a live supply or if you are not brave enough, just leave the heating in the continuous position.
You should be able to wire a programmable stat from an old stat.
The four wires will most likely be:
Common - Live in from the CH ON terminal on the old timer
Call for heat - Live out to the motorized valve or switch live terminal if it is a combi.
Neutral - Usually used for the anticipator on the stat.
Earth - Pretty obvious.
The Honeywell CMxxx is powered by batteries and requires a live in and out for the switching side of the stat, which you have on the old stat.
The neutral and earth will not be needed with the new stat.
If you do use the old common on the new stat, you will either need to wire up the CH ON wire to a live supply or if you are not brave enough, just leave the heating in the continuous position.
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