B737CL Air System

[AlwaysReady]

Thanks for your all the view, appreciate it
Ya my question is more towards the 400series..(maybe my question isnt clear enough so i try to rephrase my quesion)

(A)So like wut ive said, the 400 has 2 recirc fan. and it inhibits itself during highflow

Auto-
inflight - Left recirc : it inhibits when either pack in high
Right recirc : inhibits when both pack in high
on grd Left recirc : inhibits when both pack in high
right recirc : will work regardless

(left recirc collects from aft of fwd cargo compartment )
(right recirc collects from pax cabin and equipment cooling)

so why does it inhibits is the question..

(B) Since left pack provides air to the cockpit and right to the cabin as per say, I've learn that there is also something called electronic pack/zone controller located in the E&E compartment which provide inputs for pack and zone temperature control and each controls the ram air door

Left pack/zone controller - primary control for the left pack and standby for the right
Right pack/zone controller - the opposite

the question is, in my CBT it also states that

left pack/zone controller : provide temperature control for the aft cabin and standby for the flight deck
right pack/zone controller: provide temperature control for the fwd cabin and the flight deck

which explains 2 pack controller and 3 zone contorller

So since Left pack/zone controller control left pack which is suppling air to the flightdeck, why its also providing temperature control for the aft cabin and only standby for the flight deck??