I was a twinkle in my fathers eye when it was installed, and a mere boy when we moved house, leaving it behind, (and moved up to a Vulcan Continental...!). Working from childhood memories and a bit of a Google on here.
If you could tell me any more about Abergas i'd be pleased to hear from you.
I will look around for the installation instructions.
As you will see earlier in this forum, there is a picture of it. The 1st picture shows the inners.
In principle, these have a fan unit (the part on the left of the photo). This is connected to the back plate & a chamber to the outside for incoming air outside. The gas is plumbed into the side wall of this unit.
The Fan is bolted to the Heat exchanger & inside the HE, there is a burner (the later ones worked well).
There an igniter (like a simple spark plug base) set to the side of the fan unit where it joins the HE. This is inside the HE, between the burner & the HE inner wall. the spark is generated by the capacitor control panel.
The later HE, was a work of art, but had they been made of stainless steel would have worked forever.
When the boiler was switched on the electrical system would check all 1st.
The pump would be running, then the fan would start. The gas valve would be opened by the control panel & the ignition would fire, causing the gas coming into the HE via the burner to ignite.
The fan would run all the time the unit was on & constantly 'push the mix of air/gas into the HE. The water would be pumped into the HE via one pipe. circulate the HE & leave Hot via the out pipe, to be pumped around the Rad system. Returning when cooler & the cycle repeats itself again.....
On our one, there is a thermostat inside the out bound pipe & this controlled the temperature the boiler worked too (this changed on later HE's).
The HE was clever, the back & front round chambers were welded to pipes, about 1/2" dia' and set apart by about an i" each. They then during the assembly, inserted the round discs over every other pipe. stacked one on top of the other, in rotation to every other one.
This caused a small hole where the disc on the adj' pipe would lay, leaving small 1/8" square gap, & so up to the top. The other end plate was then welded on.
The hot burned gas mixture was then vented through the small gap holes heating the discs/pipes & hence the water flowing inside, then cooled, into the outer casing & out through the flue.
Sadly, it was these holes between the disc that would corrode & block up the holes (because the HE is made of steel). Hence the outgoing spent air/gas mixture could not escape, so the boiler would start up, fire, then shut down again.
Removing the flue cover & looking into the Flue, from the outside wall, when it was firing you could see the fire inside the HE & it looked like a mini furnace inside.
Job done......
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from memory they where over 90% . without the need for a drain. never knew one that lasted more than 10 years customers could not put up with the constant breakdowns, last one i saw was around 1986
The 2 pics and this thread is all that comes up though. 
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) If you need some space and no longer require the boiler i'd be happy to take it off your hands, just to examine it!
