Is the recommended setting in the install manual or what?
I'm not understanding why there should be options since
the temp sensor doesn't have an option (and there is no
humidity sensor).

I'm not having any particular issues at work. I'm merely
reading up on heat pumps and I thought maybe an explanation
of the need for these various timer options would provide
insight into an icing problem were I to encounter one.

Thank you. (Expect another heat pump question in the
next few days. I'm still reading.)