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All installed working fine, a bit of a job sitting room only in loft, some crawling and a 6 way junction box to play with!!. Again thank you SL and every one else.

Thanks SL did a bench test and worked well, awaiting on some 6 way connecting boxes and will then install 

Thank you all, passed info on,now waiting for the bits to arrive. Yes the pir will do the timing I forgot!  

I will need a timer too

Thanks, I was thinking of this http://www.ebay.co.uk/itm/200731948280?ssPageName=STRK:MESINDXX:IT&_trksid=p3984.m1436.l2649 Then I will need a box to fit it in

Thank you, this is what I was thinking ( I'm just the maintenance man) . Now where do I get this relay from?   Just thinking this relay needs to have a timer built in to it 

  HRU 100 

Thanks. This unit has trickle speed on all the time and then you can switch to boost speed you can not have trickle and boost at same time or the motor will burn out.so like a light switch you go from L 1 to L 2, if L 1 is like n/c and L 2 is like n o how can no connection to n o work boost...

test

Hi.I have installed a heat recovery unite (HRU) which has a 2 speed fan lo, hi, can be controlled by a 2 way light switch. Now the problem,I have been asked to fit pirs in 2 Ensuite bathrooms to run HRU, on the pir is 2 rows of 3 connections 1st row live, neutral,sw. 2nd row n/c,c,n/o with one...