Hydronic d5?

Hey guys i bought a used cascadia about a year ago i noticed it had one of those hydronic d5 under the sleeper. I try to start it up all i got was a Puff of white smoke. I would like to service it my self i am local so the truck will be getting a lot of cold starts and wanted this thing to warm my engine before start and no i dont want a apu since i will only use it at the start of the day. My question is i seen many videos of people starting it in their homes. What do i need besides a 12v battery to get it running in my garage? A detail answer will be welcomed.

 

Just bench testing it and it does not start so i wanted to clean it out and service it but also wanted to make sure it runs before i install it since its a nightmare to get it under the cab. also will leave the doors and windows open or just turn it on outside.