Count the number of control boxes carefully. You should see there are two. You'll also see a box containing a relay and what looks suspiciously like a "normal" two channel timer switch.
The two control boxes are needed because the control system from Sanyo doesn't accept that you might need two or more heat pumps from one controller. There's plenty of room in the box for an extra signalling cable per heat pump.
But since it's not good enough to do that, all the heat sensors (except for the room stat) have to be duplicated. You have to program them to accept the same temperatures and times of day in order that they may work roughly the same. Silly.
The extra time switch is because the controllers want the heating circulation pump to run pretty much 24x7. The only time they'd stop is when the temperature is above the "summer limit" of (a programmable) 16c. The time switch is an optimisation from the distributor to overrule that. The jury is out on whether that works effectively or not.
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