Yeah, but indirect (with e.g. water/glycol between the condenser and the indoor air handler) systems can be combined with scrubber tanks (basically just water+b

Yeah, but indirect (with e.g. water/glycol between the condenser and the indoor air handler) systems can be combined with scrubber tanks (basically just water+baffles, I think) that the blow-off from a leak or a pressure relief valve is forced through, in order to contain most of the ammonia.