Wiring for honeywell pipe thermostat L641B1004

[HappyHippyDad]

Evening all.

A friend has just rang from abroad asking how to wire up the above thermostat. He wants to use it to switch on/off a pump. I dont get into heating systems so am at a loss, but would like to send him some information if any of you guys can help.

This thermostat has 3 terminals (C, 1, 2) as seen in the first diagram on this link honeywell pipe thermostat wiring diagram - Google pretraga - https://www.google.co.uk/search?q=honeywell+pipe+thermostat+wiring+diagram&safe=active&prmd=sivn&source=lnms&tbm=isch&sa=X&ved=0ahUKEwijr6q_6MPYAhXIAcAKHWXHCfoQ_AUIEigC&biw=960&bih=600

1. Can it be used to switch the pump on/off?
2. What gets connected to C, 1 and 2 and where does this cable go?

Cheers all.

 

[Leesparkykent]

Evening all.

A friend has just rang from abroad asking how to wire up the above thermostat. He wants to use it to switch on/off a pump. I dont get into heating systems so am at a loss, but would like to send him some information if any of you guys can help.

This thermostat has 3 terminals (C, 1, 2) as seen in the first diagram on this link honeywell pipe thermostat wiring diagram - Google pretraga - https://www.google.co.uk/search?q=honeywell+pipe+thermostat+wiring+diagram&safe=active&prmd=sivn&source=lnms&tbm=isch&sa=X&ved=0ahUKEwijr6q_6MPYAhXIAcAKHWXHCfoQ_AUIEigC&biw=960&bih=600

1. Can it be used to switch the pump on/off?
2. What gets connected to C, 1 and 2 and where does this cable go?

Cheers all.

do they want it to make on temp rise or break on temp rise? Is the pump controlled by a timer?

 

[davesparks]

It’s a switch with an N/O and an N/C contact which operates at a set temperature.
If they can’t connect a simple switch then it’s time to call an electrician.

 

[HappyHippyDad]

do they want it to make on temp rise or break on temp rise? Is the pump controlled by a timer?

I dont know if the pump is controlled by a timer Lee. Could you give an example of the wiring if it was make on temp rise?
Cheers in advance

 

[davesparks]

I dont know if the pump is controlled by a timer Lee. Could you give an example of the wiring if it was make on temp rise?
Cheers in advance

Make on temperature rise would use the N/O contact to operate the pump.

 

[HappyHippyDad]

It’s a switch with an N/O and an N/C contact which operates at a set temperature.
If they can’t connect a simple switch then it’s time to call an electrician.

From the diagram it just looks the same as a 2 way switch, but where does the cable from this thermostat go?
Is it exactly the same as a switch? If so it has a PL and a SL, but that means the pump must have a seperate PL going to it or you have to use a JB?

So PL to C and SL to 1, so a 2 core cable. Then 2 core cable to where? The pump will just have a 3 core (l,n and earth) attached to it.

 

[Leesparkykent]

I dont know if the pump is controlled by a timer Lee. Could you give an example of the wiring if it was make on temp rise?
Cheers in advance

C and 2 make on temp rise, C and 1 break on temp rise. So if it's high limit you want then it's C and 2, if it's low limit you want its C and 1.

Without understanding the setup up its hard to advise. Perm live, timer feed or what ever you have to C and switch live to pump from 1 or 2 depending if you want the pump to kick in on temp rise above what's set or for it to run when below temp that it's set.

 

[davesparks]

From the diagram it just looks the same as a 2 way switch, but where does the cable from this thermostat go?
Is it exactly the same as a switch? If so it has a PL and a SL, but that means the pump must have a seperate PL going to it or you have to use a JB?

So PL to C and SL to 1, so a 2 core cable. Then 2 core cable to where? The pump will just have a 3 core (l,n and earth) attached to it.

Yes it is a simple SPDT switch which is activated by temperature.
The cable from the thermostat goes to wherever you want/need it to go.

Depending on the power rating of the pump and the thermostat it could either control the pump directly (probably via a jb of some kind) or control a relay/contactor.

 

[HappyHippyDad]

Thankyou both. That all makes sense.

 

[Dave OCD]

HHD, you could use a switched fused spur and have both pipe 'stat and pump flexes running back to it, live to the stat from the L load terminal and the return from stat to feed the pump in a separate connector within the spur box.

 

[HappyHippyDad]

Thanks Dave.
It seems really simple now... its just a switch!

 

[Dave OCD]

Exactly that mate.