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This should answer it: http://hvac-talk.com/vbb/showthread.php?t=153463 It looks like you will only get stage 1 and 2 with the 8870.

You can try piggybacking the second 8870 to the first, but I do recall a technote somewhere that mentioned changing a jumper in the 8811 when wiring directly to the thermostats without the distribution panel. This may be a termination issue on the 485 side. You really should buy a panel. It...