Commercial Air Conditioner Model: HBU-18CF03HDU-42CF03/H HPU-42HF032CONTENTSContents……………………………………………………….....21. Description of products & features………………………....32. Specification…………………………………………………..73. Safety precaution……………………………………………114. Net dimension of indoor and outdoor……………………..135. Installation instructions………..…………………………….166. Parts and functions………………………………………….377. Remote controller functions………………………………...408. Refrigerant diagram………………………………………....619. Electrical control functions………………………………….6410. Diagnostic information (trouble shooting)………………..7011. Electrical data……………………………………………….7412. Air velocity distribution……………………………………..88