BOSStherm Bup 2

[windsor64]

Hi all i am replacing my time clock with a bup 2, but the wiring drg is not that helpfull. was advised to get more informtion from Electrium who make it for boss but have had no help yet, can some please point me in the right direction as to where i might get a better wiring drg

thanks for any help

 

[D_Hailsham]

What is the clock you are replacing? What don't you understand about the wiring diagram? It seems straightforward to me.

 

[windsor64]

Hi D_Hailsham i am replacing a randall danfoss 4033 mech programmer on a y plan system and before i get started to replace it i wanted a better wiring drg as the one supplied seems basic and i know that i have more cables than the ones shown on the bup 2, thank you for the reply

 

[kevplumb]

http://www.ptsplumbing.co.uk/content/1/84/own-brand-heating-controls.html

new(page down)

http://danfoss-randall.co.uk/PCMPDF/7486v04 web.pdf

existing

 

[D_Hailsham]

OK.

The 4033 terminals are:

1 - Common
2 - Heating ON
3 - Heating OFF (not usually used)
4 - Hot Water ON
5 - Hot Water OFF
6 - Live
7 - Neutral
Earth

The only extra wire I can think of is one linking terminal 1 to terminal 6. If you have a link, you can discard it as the BUP 2 has an internal link.

if you do not have a link, the BUP 2 is not suitable.

If you have the link, the wiring of the BUP 2 is as follows:

Neutral
Live
1 - Hot Water OFF
2 - Heating OFF (only use if there is a wire to 3 of the old timer)
3 - Hot Water ON
4 - Heating ON

You just swap the leads over to the appropriate terminals. Do it one at a time, so you don't get muddled. Also write down the existing wiring in case you make a mistake.

If more than one wire goes to a terminal of the 4033, just swap all over to the relevant BUP 2 terminal (except the link from 1 to 6).

 

[windsor64]

Wow that was quick, thankyou both very much for your help that has made it a lot cleary now.

 

[windsor64]

Just a quick one i see all the connections but cant see a place to wire the room stat or am i been dumb if so sorry

 

[D_Hailsham]

Just a quick one i see all the connections but cant see a place to wire the room stat or am i been dumb if so sorry

Now I'm the one who is confused! This is the first time you have mentioned a thermostat. Are you changing both the timer and the thermostat or what? The BUP 2 is just a programmer, not a programmable thermostat.

If you already have a thermostat, there is no need to change the thermostat wiring, just change the timer has advised earlier.

For info, the room stat is fed from the CH ON terminal.

 

[windsor64]

Hi D_Hailsham thankyou for that all sorted now.