Help needed with a wiring issue for a fan!!!

[smiffey]

Hi all,

Can anyone help? I've been asked by a customer if there is a way to vent his store room when it gets to a set temperature, he wants fan to kick in and vent then when it cools down again to stop venting as he is concerned with the running costs. I was wondering if i could achieve this by wiring a room thermostat up so one side has a perm 240 feed and outgoing/ signal side to the fan so it comes on and goes off as he has asked.

Thanks for any advice.

 

[johnboy6083]

if you uinsure iof the connections on the stat, use your multimeter, to work it out

 

[truckster]

Just to complicate the issue, if it's a fire door then any holes you make might need f/proof collars for building regs.

 

[smiffey]

To be honest I don't really want to be cutting fire doors I will have to find another way of getting air in the room. cheers johnboy6083 i will be using the wiring diagram and my testers to find to correct way to do it, better safe than sorry i say.

 

[smiffey]

just to check chaps, I've got my sexy a Honeywell room stat, I've made it up on my desk as if i was going to install it and I've got term

1-perm live
2-neutral
3-temperature rising putting 240 on it
4-temperature falling putting 240 on it

so when the dial is at say 20c it has 240 on term 4 but when i turn the temp up to 25c 240 drops from term 4 and goes onto term 3 with 240. so for the fan fan to work on temp rise i will share the earth and neutral and the the fan live on term 3. Anyone see any problems with this?

 

[zedess]

yes please..and send us a pic of the guy who is worried about the running cost of an extractor fan.....

 

[truckster]

just to check chaps, I've got my sexy a Honeywell room stat, I've made it up on my desk as if i was going to install it and I've got term

1-perm live
2-neutral
3-temperature rising putting 240 on it
4-temperature falling putting 240 on it

so when the dial is at say 20c it has 240 on term 4 but when i turn the temp up to 25c 240 drops from term 4 and goes onto term 3 with 240. so for the fan fan to work on temp rise i will share the earth and neutral and the the fan live on term 3. Anyone see any problems with this?

No the fan live goes onto terminal four. When the temperature rises the fan has to come on, it's the opposite to when you have the stat wired to bring on the ch heating.

 

[telectrix]

yep, fan L to terminal 4. all the stat does is switch 1 between 3 and 4 dependent on the temp. setting. it's just basically a relay.

 

[smiffey]

Ok I've put my t5's on-

1+e 240
3+e 0v at 20c then 240v at 25c
4+e 240v at 20c then 0v at 25c

http://www.honeywell.com.pl/pdf/automatyka_domow/termostaty/T6360.pdf

I have the one with the lamp t6360/4360

 

[truckster]

Smiffey, you will punch your own head when it clicks but what you are doing is confusing yourself. By adjusting the stat upwards you are telling it you want the room to be warmer, i.e. that the room is cold so the stat clicks onto 3 usually bringing the heating on, you want the opposite.

 

[telectrix]

look at it this way. if it's cold and the stat is set to 25, the supply is on 3. of it's hot and the stat is set to 10, then the supply is on 4, which is what you want to kick the fan in when its hotter than the setting on the stat.

 

[smiffey]

ok punch is deserved I now understand, cheers for being understanding tho chaps, your help has been very very useful .

 

[giio]

correct,and don't fit the stat in the airflow between the make up air and the stat