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I need to wire two timers to control the one gas burner.
One timer is for underfloor heating the other for hot water/rads

Problem is if I run the timers switchwire both back to the one Live terminal on the burner the live will backfeed throught the other and turn on the other device that the other timer is controling..Is this correct :confused:
I was thinking if i was to wire each timer back to a seperate contactor first that when one timer kicks in it will pull in the contactor and send power to the burner without activating the other timeclock.Then if I wanted the other timer could also turn on at any time regardless of the state of the other timer

Does this make sense?
 
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jeremy

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Mentor
Arms
Try a 2 zone timer (2 CH zones 1 DHW) Contactors are an added expense and are something else that you need to hide or look pretty, or have all the heating on at the same time but have a programmable room stat for the ufh to turn off the actuators on the manifold. Hope this helps
 
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  • #3
Try a 2 zone timer (2 CH zones 1 DHW) Contactors are an added expense and are something else that you need to hide or look pretty, or have all the heating on at the same time but have a programmable room stat for the ufh to turn off the actuators on the manifold. Hope this helps
Can't have two zone timer as the customer wants the timeclocks in different locations :mad:
Can't have all heating on at same time either as I have to wire the hot water and rads seperate but I was going to use a two zone timeclock for this,Plus I also have a seperate stat for the rads to the ufh
 

jeremy

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Mentor
Arms
There has to be an easier way round this. we have in the past fitted polyplumb multi zone RF controllers for under floor heating systems, try their website. Best of luck!
 
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  • #5
There has to be an easier way round this. we have in the past fitted polyplumb multi zone RF controllers for under floor heating systems, try their website. Best of luck!

Cheers :(
I think the contactor option is best as Im fairly certain it will work and its the less complicated option
 
J

Jurassic Spark

If under-floor heating and rads are both supplied by hot water from a gas boiler, install as `S` plan. i.e. motorised valves - one on the rad feed, one on the u/f feed both controlled from time clocks and t/stats.
 
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H

heathelect

If under-floor heating and rads are both supplied by hot water from a gas boiler, install as `S` plan. i.e. motorised valves - one on the rad feed, one on the u/f feed both controlled from time clocks and t/stats.

Good idea that is, but dont forget to control MZVs from your stats (feed to stats from timer switch wire & switchwire from stats to operate MZV motor),then(switchwire from timer onto each MZV switch terminal and switchwire to boiler is taken from the other side of the MZV switches), if you can understand that your better than me !. (good luck)
 
J

jonna

The plumber should be installing zone valves to each circuit ie underfloor,hot water and rads the valves have contacts on them to enable you to have time and temperature controls for each circuit but still using one boiler.
 
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