Changing old boiler timer with a wireless thermostat - IMM24

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Hi all

I would like to swap out the old analogue timer switch, with a digital timer with wireless stat

there is no house thermostat currently in the house. if the heating is scheduled to come on, the house just keep heating and heating, until the in-line stat on the boiler itself (out in the garage) cuts it out.

there is no separate control for water/heating, it is all linked, so it sees that in the summer if you want hot water, you use the immersion or accept the heating comes on. (though I have fitted thermo valves to all rads, so I can turn them all off in the summer now, but the pipes will still heat which is a pian, but a pain I am willing to live with)

I am basically, trying to do a direct replacement. I want to take off the old timer switch, and replace with the new receiver unit. they are both basically switches in the end, so I figured it would be simple.. but no, of course its not...

in the kitchen, there is a master switch which disables the timer. a pos. and neg. wire go form the master switch socket into the timer-switch. the wires then go out the back of the timer switch to the boiler in the garage ( or at least the consumer unit in the garage which then feeds the boiler, I am not entirely sure as I can not trace the wires)

in the IMM24, the 2 red wires (one one sleeved), go from the Live-out, AND the Neutral terminals. 9the sleved red wire goes to the neutral terminal)

in the new wireless at receiver, there are 4 connectors...

NO
COM
Live
neutral

it states in the instructions, that typically, the NO is connected to the switched live in the boiler stat-loop (which I would have thought was the "sleeved red" wire previously going out the back of the IMM24), and the COM should go to live on the boiler stat-loop
(link to manual of the new wireless stat timer - http://www.salus-tech.com/cache/filelibrary/4726/library/fileLibrary/2015/10/Salus-RT500RF-.pdf)

when I connect it all up, the receiver works, turns on OK, but no power goes to the boiler.

I am sure I am doing something fundamentally wrong here. even as I type this, I am thinking it is something to do with the fact that there is a thermostat-loop on the boiler itself due to the water-temp stat. therefore, the old IMM24 was somehow linking in with that, but that s where I get confused... as the pump and boiler have a mains socket each in the garage, I can see the boiler-stat wiring, and it is a switches circuit in itself, I just can not fathom how the wiring in the back o the IMM24 fits into the whole thing...

this is the master-switch I mentioned, it sits next to the IMM24 timer switch and sends power to the timer
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this is inside the IMM24.. see the sleeved RED wire going into the Neutral terminal....

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this is the wiring on the boiler itself out in the garage (oil burner). below this is a zoomed out photo showing how the boiler stat wiring ties in....
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I have just rewired the old timer switch back in and it all comes on... I was worried that I had done something stupid and blown a fuse LOL

so basically... the old one has 2 red wires that come out the back of it... one sleeved and one not, that go somewhere... when the switch is set to ON, something at the end of those wires tells the boiler to do its thing...

so how on earth do I make the new unit, simulate that same activity.. this has to be easy.... LOL
 

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