GE SpacemakerXL JVM1420 Owner's Manual page 31

Switch places after !/2 time.
Switch places after 1/2 time.
* To reheat on 2 levels
or
" To reheat 2 dishes on the
lower level:
1 Multiply reheat time
by 11/2.
2 Switch places aPter 1/2
tile time.
31