Discuss Wiring for honeywell pipe thermostat L641B1004 in the Electrical Forum area at ElectriciansForums.net

Welcome to ElectriciansForums.net - The American Electrical Advice Forum
Head straight to the main forums to chat by click here:   American Electrical Advice Forum

HappyHippyDad

-
Esteemed
Arms
Reaction score
5,578
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.
 
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?
 
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.
 
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:)
 
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.
 
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.
 
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.
 
Thankyou both. That all makes sense.
 
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.
 

Reply to Wiring for honeywell pipe thermostat L641B1004 in the Electrical Forum area at ElectriciansForums.net

OFFICIAL SPONSORS

Electrical Goods - Electrical Tools - Brand Names Electrician Courses Green Electrical Goods PCB Way Electrical Goods - Electrical Tools - Brand Names Pushfit Wire Connectors Electric Underfloor Heating Electrician Courses
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc

Electrical Forum

Welcome to the Electrical Forum at ElectriciansForums.net. The friendliest electrical forum online. General electrical questions and answers can be found in the electrical forum.
This website was designed, optimised and is hosted by Untold Media. Operating under the name Untold Media since 2001.
Back
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.

I've Disabled AdBlock