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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Electrical Questions >> Thermostat & programmer https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1230298414 Message started by The_Trician on Dec 26^th, 2008, 1:33pm

Title: Thermostat & programmer
Post by The_Trician on Dec 26^th, 2008, 1:33pm

Thermostat & programmer - connect in series or parallel?

This one's to settle an argument!

TT

Title: Re: Thermostat & programmer
Post by Lectrician on 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!

Title: Re: Thermostat & programmer
Post by CWatters on Dec 27^th, 2008, 6:53pm

I vote both series and parallel ;D ... �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!

Title: Re: Thermostat & programmer
Post by scotspark on Dec 27^th, 2008, 9:45pm

that type usualy have a batery for the display CW

Title: Re: Thermostat & programmer
Post by Lectrician on Dec 28^th, 2008, 7:50am

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

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.

Title: Re: Thermostat & programmer
Post by cosbycarl on Dec 28^th, 2008, 12:00pm

Still ill lec? too much drink or that cold/flu going round?

Title: Re: Thermostat & programmer
Post by Lectrician on Dec 28^th, 2008, 1:13pm

Bloody flu/cold thing - Whole family and neigbours!

Title: Re: Thermostat & programmer
Post by cosbycarl on 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!