I have a Rheem Air Handler ( Model#: RCPB-C024) and a Weather King heat pump ( Model#: 10PJB24A01) are these two units compatible with one another? What size piston should I have for the air handler in order for these units to work together if they are able to work efficiently? Also, where can I get the owners manual for these two pieces of equipment. Any help will be greatly appreciated. Thank You.