Anyone has the service manual for hussmann Rack plus 2 systems XPRT 2 Altech controller.
model S2S-4A7S7S-5B-PLK S# PS2-156-96.

freezer 404a and there is some issue with iced up in some evap case, koolgas defrost setting at 18 min for 4 times in 24 hr.

the company i work for just recently took over the store and there is no log from previous maintenance record.
what is normal liquid level for this system?