If you are on a server, yeah you can use any mod that has a chunk loader available. If you are playing single player, you will still use the chunk loader, but will need to keep the game running.
Going on with what Captain Obvious said, it is an FTB pack so FTB Utils Chunkloading is always a thing.
Check the top left corner of your inventory and click that little map.
Talk to your server owner, make sure they allow chunk loaders in the first place. Most servers put a restriction on them (as in how many chunks you can have loaded)