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You can look into mv's -v (verbose) option to log what is actually done.
While I could post some error handling for this very basic snippet, I'd suggest you play around with e.g. if [ "$SERIES" -ne...

Upper case, lower case, or mixed case file names? However, try
for FN in *.dat; do read X SERIES X <"$FN"; echo mv "$FN" "Target_$SERIES/$FN"; done
mv Claim25112016222930.dat...

Any attempts/ideas/thoughts from your side?

Use:
$4==0

instead of:
int($4)==0

awk 'BEGIN {a=1}
$1=="0000"&&a==1 {a++;print "H" $0;next}
$1=="0000"&&a==2 {a=1;print "T" $0;next}
$1=="5000" && $NF=="0" {print $0}
' urfile

But I don't understand how...

Try:
awk -F, -v n=$(wc -l < file) '
NR < 7 || $3 ~ /[A-Za-z]/ || int($4)==0 {next}
NR==(n-2){exit}
1' file

Another one:
awk -F, -v n=$(wc -l < file) '
NR < 7 || $3 ~ /[A-Za-z]/ || int($4)==0 {next}
NR==(n-2){exit}
{s+=$4}
END{if(!s)print "Sum is Zero" > "Logfile"}
1' file