For SUM, DFSORT uses an F for a positive sign if ZDPRINT=YES is in effect or a C for a positive sign if ZDPRINT=NO is in effect. DFSORT's shipped installation default is ZDPRINT=YES, but the site can change that to ZDPRINT=NO.
If you want to ensure that ZDPRINT=YES is in effect for a particular job, you can specify:
for that job.
If you want to ensure that ZDPRINT=NO is in effect for a particular job, you can specify: