Ask The Trades - Thermostat & programmer

The_Trician Trade Member Offline Posts: 7721 Total Thanks: 8 For This Post: 0 Gender: Trade: Electrician	Thermostat & programmer Dec 26^th, 2008, 1:33pm Thermostat & programmer - connect in series or parallel? This one's to settle an argument! TT
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Lectrician Administrator Trade Member Author Offline Ask The Trades Posts: 8815 Total Thanks: 109 For This Post: 0 Braunton, North Devon United Kingdom Gender: Trade: Electrician	Re: Thermostat & programmer Reply #1 - Dec 26^th, 2008, 2:26pm Series. Both timeclock and room stat need to call for the central heating to be on. Unless it is a frost stat, in which case it is in parallel with the timeclock in order to bypass it when its frosty!
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CWatters

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Re: Thermostat & programmer
Reply #2 - Dec 27^th, 2008, 6:53pm

I vote both series and parallel Grin

... �The switched live outputs need to be in series to control the load but what about powering the second one in the chain? �

Lets say live comes into the time clock then switched live from the time clock goes to the stat. If you do that the stat is unpowered when the time clock switches off. You either need to use an old fashioned stat that doesn't need a permanant live power or one with seperate �terminals for powering the stat and the load. If you don't the fancy LCD display on the stat will go blank when the timer switches off.

or at least I think so. Still recovering from christmas!

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« Last Edit: Dec 27^th, 2008, 6:54pm by CWatters »

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scotspark Trade Member Offline mmmmm it's gonna cost you!! Posts: 3074 Total Thanks: 10 For This Post: 0 scotland Scotland Gender: Trade: Electrician	Re: Thermostat & programmer Reply #3 - Dec 27^th, 2008, 9:45pm that type usualy have a batery for the display CW
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Lectrician

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Re: Thermostat & programmer
Reply #4 - Dec 28^th, 2008, 7:50am

CWatters wrote on Dec 27^th, 2008, 6:53pm:

I vote both series and parallel Grin

... �The switched live outputs need to be in series to control the load but what about powering the second one in the chain? �

Lets say live comes into the time clock then switched live from the time clock goes to the stat. If you do that the stat is unpowered when the time clock switches off. You either need to use an old fashioned stat that doesn't need a permanant live power or one with seperate �terminals for powering the stat and the load. If you don't the fancy LCD display on the stat will go blank when the timer switches off.

or at least I think so. Still recovering from christmas!

Stats like that are usually programmable stats, and you therefore do not connect to a time clock anyway.

Fancy stats with a screen are more often than not battery powered with volt free contacts, or if they are mains they will have seperate terminals for the L+N and then a a volt free contact.

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cosbycarl GDPR opt-out Total Thanks: 109 For This Post: 0	Re: Thermostat & programmer Reply #5 - Dec 28^th, 2008, 12:00pm Still ill lec? too much drink or that cold/flu going round?
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Lectrician Administrator Trade Member Author Offline Ask The Trades Posts: 8815 Total Thanks: 109 For This Post: 0 Braunton, North Devon United Kingdom Gender: Trade: Electrician	Re: Thermostat & programmer Reply #6 - Dec 28^th, 2008, 1:13pm Bloody flu/cold thing - Whole family and neigbours!
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cosbycarl GDPR opt-out Total Thanks: 109 For This Post: 0	Re: Thermostat & programmer Reply #7 - Dec 28^th, 2008, 6:13pm not good! i always get the beginning of a cold, runny nose or tickley throat etc but it always completely disappears about 4 days into it? not had flu for 11 years, dunno wat im doing right? hope it clears soon as its horrible, thats how bad my last flu was, i can still remember it!
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