50WCA048BAA6AA-A
50 = Packaged WSHP Unit
WC = 1-Stage (Compact)
A = Horizontal, Side Filter Access. Front Left Water Conn
048 = 4 Ton 
B = Horizontal, Right Return, Left Discharge
A = UPM/50 VA
A = No Refrig Circuit Options, Non-Coated Copper Air Coil
6 = 460-3-60
A = No Sound, Standard Insulation
A = No Hydronic Options
- = No Options
A = Initial Release